1 |
/* $Header$ */
|
2 |
|
3 |
/*
|
4 |
* tclVar.c --
|
5 |
*
|
6 |
* This file contains routines that implement Tcl variables
|
7 |
* (both scalars and arrays).
|
8 |
*
|
9 |
* The implementation of arrays is modelled after an initial
|
10 |
* implementation by Mark Diekhans and Karl Lehenbauer.
|
11 |
*
|
12 |
* Copyright (c) 1987-1994 The Regents of the University of California.
|
13 |
* Copyright (c) 1994-1997 Sun Microsystems, Inc.
|
14 |
* Copyright (c) 1998-1999 by Scriptics Corporation.
|
15 |
*
|
16 |
* See the file "license.terms" for information on usage and redistribution
|
17 |
* of this file, and for a DISCLAIMER OF ALL WARRANTIES.
|
18 |
*
|
19 |
* RCS: @(#) $Id: tclvar.c,v 1.1.1.1 2001/06/13 04:48:07 dtashley Exp $
|
20 |
*/
|
21 |
|
22 |
#include "tclInt.h"
|
23 |
#include "tclPort.h"
|
24 |
|
25 |
/*
|
26 |
* The strings below are used to indicate what went wrong when a
|
27 |
* variable access is denied.
|
28 |
*/
|
29 |
|
30 |
static char *noSuchVar = "no such variable";
|
31 |
static char *isArray = "variable is array";
|
32 |
static char *needArray = "variable isn't array";
|
33 |
static char *noSuchElement = "no such element in array";
|
34 |
static char *danglingElement = "upvar refers to element in deleted array";
|
35 |
static char *danglingVar = "upvar refers to variable in deleted namespace";
|
36 |
static char *badNamespace = "parent namespace doesn't exist";
|
37 |
static char *missingName = "missing variable name";
|
38 |
static char *isArrayElement = "name refers to an element in an array";
|
39 |
|
40 |
/*
|
41 |
* Forward references to procedures defined later in this file:
|
42 |
*/
|
43 |
|
44 |
static char * CallTraces _ANSI_ARGS_((Interp *iPtr, Var *arrayPtr,
|
45 |
Var *varPtr, char *part1, char *part2,
|
46 |
int flags));
|
47 |
static void CleanupVar _ANSI_ARGS_((Var *varPtr,
|
48 |
Var *arrayPtr));
|
49 |
static void DeleteSearches _ANSI_ARGS_((Var *arrayVarPtr));
|
50 |
static void DeleteArray _ANSI_ARGS_((Interp *iPtr,
|
51 |
char *arrayName, Var *varPtr, int flags));
|
52 |
static int MakeUpvar _ANSI_ARGS_((
|
53 |
Interp *iPtr, CallFrame *framePtr,
|
54 |
char *otherP1, char *otherP2, int otherFlags,
|
55 |
char *myName, int myFlags));
|
56 |
static Var * NewVar _ANSI_ARGS_((void));
|
57 |
static ArraySearch * ParseSearchId _ANSI_ARGS_((Tcl_Interp *interp,
|
58 |
Var *varPtr, char *varName, char *string));
|
59 |
static void VarErrMsg _ANSI_ARGS_((Tcl_Interp *interp,
|
60 |
char *part1, char *part2, char *operation,
|
61 |
char *reason));
|
62 |
|
63 |
/*
|
64 |
*----------------------------------------------------------------------
|
65 |
*
|
66 |
* TclLookupVar --
|
67 |
*
|
68 |
* This procedure is used by virtually all of the variable code to
|
69 |
* locate a variable given its name(s).
|
70 |
*
|
71 |
* Results:
|
72 |
* The return value is a pointer to the variable structure indicated by
|
73 |
* part1 and part2, or NULL if the variable couldn't be found. If the
|
74 |
* variable is found, *arrayPtrPtr is filled in with the address of the
|
75 |
* variable structure for the array that contains the variable (or NULL
|
76 |
* if the variable is a scalar). If the variable can't be found and
|
77 |
* either createPart1 or createPart2 are 1, a new as-yet-undefined
|
78 |
* (VAR_UNDEFINED) variable structure is created, entered into a hash
|
79 |
* table, and returned.
|
80 |
*
|
81 |
* If the variable isn't found and creation wasn't specified, or some
|
82 |
* other error occurs, NULL is returned and an error message is left in
|
83 |
* the interp's result if TCL_LEAVE_ERR_MSG is set in flags.
|
84 |
*
|
85 |
* Note: it's possible for the variable returned to be VAR_UNDEFINED
|
86 |
* even if createPart1 or createPart2 are 1 (these only cause the hash
|
87 |
* table entry or array to be created). For example, the variable might
|
88 |
* be a global that has been unset but is still referenced by a
|
89 |
* procedure, or a variable that has been unset but it only being kept
|
90 |
* in existence (if VAR_UNDEFINED) by a trace.
|
91 |
*
|
92 |
* Side effects:
|
93 |
* New hashtable entries may be created if createPart1 or createPart2
|
94 |
* are 1.
|
95 |
*
|
96 |
*----------------------------------------------------------------------
|
97 |
*/
|
98 |
|
99 |
Var *
|
100 |
TclLookupVar(interp, part1, part2, flags, msg, createPart1, createPart2,
|
101 |
arrayPtrPtr)
|
102 |
Tcl_Interp *interp; /* Interpreter to use for lookup. */
|
103 |
register char *part1; /* If part2 isn't NULL, this is the name of
|
104 |
* an array. Otherwise, this
|
105 |
* is a full variable name that could
|
106 |
* include a parenthesized array element. */
|
107 |
char *part2; /* Name of element within array, or NULL. */
|
108 |
int flags; /* Only TCL_GLOBAL_ONLY, TCL_NAMESPACE_ONLY,
|
109 |
* and TCL_LEAVE_ERR_MSG bits matter. */
|
110 |
char *msg; /* Verb to use in error messages, e.g.
|
111 |
* "read" or "set". Only needed if
|
112 |
* TCL_LEAVE_ERR_MSG is set in flags. */
|
113 |
int createPart1; /* If 1, create hash table entry for part 1
|
114 |
* of name, if it doesn't already exist. If
|
115 |
* 0, return error if it doesn't exist. */
|
116 |
int createPart2; /* If 1, create hash table entry for part 2
|
117 |
* of name, if it doesn't already exist. If
|
118 |
* 0, return error if it doesn't exist. */
|
119 |
Var **arrayPtrPtr; /* If the name refers to an element of an
|
120 |
* array, *arrayPtrPtr gets filled in with
|
121 |
* address of array variable. Otherwise
|
122 |
* this is set to NULL. */
|
123 |
{
|
124 |
Interp *iPtr = (Interp *) interp;
|
125 |
CallFrame *varFramePtr = iPtr->varFramePtr;
|
126 |
/* Points to the procedure call frame whose
|
127 |
* variables are currently in use. Same as
|
128 |
* the current procedure's frame, if any,
|
129 |
* unless an "uplevel" is executing. */
|
130 |
Tcl_HashTable *tablePtr; /* Points to the hashtable, if any, in which
|
131 |
* to look up the variable. */
|
132 |
Tcl_Var var; /* Used to search for global names. */
|
133 |
Var *varPtr; /* Points to the Var structure returned for
|
134 |
* the variable. */
|
135 |
char *elName; /* Name of array element or NULL; may be
|
136 |
* same as part2, or may be openParen+1. */
|
137 |
char *openParen, *closeParen;
|
138 |
/* If this procedure parses a name into
|
139 |
* array and index, these point to the
|
140 |
* parens around the index. Otherwise they
|
141 |
* are NULL. These are needed to restore
|
142 |
* the parens after parsing the name. */
|
143 |
Namespace *varNsPtr, *cxtNsPtr, *dummy1Ptr, *dummy2Ptr;
|
144 |
ResolverScheme *resPtr;
|
145 |
Tcl_HashEntry *hPtr;
|
146 |
register char *p;
|
147 |
int new, i, result;
|
148 |
|
149 |
varPtr = NULL;
|
150 |
*arrayPtrPtr = NULL;
|
151 |
openParen = closeParen = NULL;
|
152 |
varNsPtr = NULL; /* set non-NULL if a nonlocal variable */
|
153 |
|
154 |
/*
|
155 |
* Parse part1 into array name and index.
|
156 |
* Always check if part1 is an array element name and allow it only if
|
157 |
* part2 is not given.
|
158 |
* (if one does not care about creating array elements that can't be used
|
159 |
* from tcl, and prefer slightly better performance, one can put
|
160 |
* the following in an if (part2 == NULL) { ... } block and remove
|
161 |
* the part2's test and error reporting or move that code in array set)
|
162 |
*/
|
163 |
|
164 |
elName = part2;
|
165 |
for (p = part1; *p ; p++) {
|
166 |
if (*p == '(') {
|
167 |
openParen = p;
|
168 |
do {
|
169 |
p++;
|
170 |
} while (*p != '\0');
|
171 |
p--;
|
172 |
if (*p == ')') {
|
173 |
if (part2 != NULL) {
|
174 |
openParen = NULL;
|
175 |
if (flags & TCL_LEAVE_ERR_MSG) {
|
176 |
VarErrMsg(interp, part1, part2, msg, needArray);
|
177 |
}
|
178 |
goto done;
|
179 |
}
|
180 |
closeParen = p;
|
181 |
*openParen = 0;
|
182 |
elName = openParen+1;
|
183 |
} else {
|
184 |
openParen = NULL;
|
185 |
}
|
186 |
break;
|
187 |
}
|
188 |
}
|
189 |
|
190 |
/*
|
191 |
* If this namespace has a variable resolver, then give it first
|
192 |
* crack at the variable resolution. It may return a Tcl_Var
|
193 |
* value, it may signal to continue onward, or it may signal
|
194 |
* an error.
|
195 |
*/
|
196 |
if ((flags & TCL_GLOBAL_ONLY) != 0 || iPtr->varFramePtr == NULL) {
|
197 |
cxtNsPtr = iPtr->globalNsPtr;
|
198 |
} else {
|
199 |
cxtNsPtr = iPtr->varFramePtr->nsPtr;
|
200 |
}
|
201 |
|
202 |
if (cxtNsPtr->varResProc != NULL || iPtr->resolverPtr != NULL) {
|
203 |
resPtr = iPtr->resolverPtr;
|
204 |
|
205 |
if (cxtNsPtr->varResProc) {
|
206 |
result = (*cxtNsPtr->varResProc)(interp, part1,
|
207 |
(Tcl_Namespace *) cxtNsPtr, flags, &var);
|
208 |
} else {
|
209 |
result = TCL_CONTINUE;
|
210 |
}
|
211 |
|
212 |
while (result == TCL_CONTINUE && resPtr) {
|
213 |
if (resPtr->varResProc) {
|
214 |
result = (*resPtr->varResProc)(interp, part1,
|
215 |
(Tcl_Namespace *) cxtNsPtr, flags, &var);
|
216 |
}
|
217 |
resPtr = resPtr->nextPtr;
|
218 |
}
|
219 |
|
220 |
if (result == TCL_OK) {
|
221 |
varPtr = (Var *) var;
|
222 |
goto lookupVarPart2;
|
223 |
} else if (result != TCL_CONTINUE) {
|
224 |
return (Var *) NULL;
|
225 |
}
|
226 |
}
|
227 |
|
228 |
/*
|
229 |
* Look up part1. Look it up as either a namespace variable or as a
|
230 |
* local variable in a procedure call frame (varFramePtr).
|
231 |
* Interpret part1 as a namespace variable if:
|
232 |
* 1) so requested by a TCL_GLOBAL_ONLY or TCL_NAMESPACE_ONLY flag,
|
233 |
* 2) there is no active frame (we're at the global :: scope),
|
234 |
* 3) the active frame was pushed to define the namespace context
|
235 |
* for a "namespace eval" or "namespace inscope" command,
|
236 |
* 4) the name has namespace qualifiers ("::"s).
|
237 |
* Otherwise, if part1 is a local variable, search first in the
|
238 |
* frame's array of compiler-allocated local variables, then in its
|
239 |
* hashtable for runtime-created local variables.
|
240 |
*
|
241 |
* If createPart1 and the variable isn't found, create the variable and,
|
242 |
* if necessary, create varFramePtr's local var hashtable.
|
243 |
*/
|
244 |
|
245 |
if (((flags & (TCL_GLOBAL_ONLY | TCL_NAMESPACE_ONLY)) != 0)
|
246 |
|| (varFramePtr == NULL)
|
247 |
|| !varFramePtr->isProcCallFrame
|
248 |
|| (strstr(part1, "::") != NULL)) {
|
249 |
char *tail;
|
250 |
|
251 |
/*
|
252 |
* Don't pass TCL_LEAVE_ERR_MSG, we may yet create the variable,
|
253 |
* or otherwise generate our own error!
|
254 |
*/
|
255 |
var = Tcl_FindNamespaceVar(interp, part1, (Tcl_Namespace *) NULL,
|
256 |
flags & ~TCL_LEAVE_ERR_MSG);
|
257 |
if (var != (Tcl_Var) NULL) {
|
258 |
varPtr = (Var *) var;
|
259 |
}
|
260 |
if (varPtr == NULL) {
|
261 |
if (createPart1) { /* var wasn't found so create it */
|
262 |
TclGetNamespaceForQualName(interp, part1, (Namespace *) NULL,
|
263 |
flags, &varNsPtr, &dummy1Ptr, &dummy2Ptr, &tail);
|
264 |
|
265 |
if (varNsPtr == NULL) {
|
266 |
if (flags & TCL_LEAVE_ERR_MSG) {
|
267 |
VarErrMsg(interp, part1, part2, msg, badNamespace);
|
268 |
}
|
269 |
goto done;
|
270 |
}
|
271 |
if (tail == NULL) {
|
272 |
if (flags & TCL_LEAVE_ERR_MSG) {
|
273 |
VarErrMsg(interp, part1, part2, msg, missingName);
|
274 |
}
|
275 |
goto done;
|
276 |
}
|
277 |
hPtr = Tcl_CreateHashEntry(&varNsPtr->varTable, tail, &new);
|
278 |
varPtr = NewVar();
|
279 |
Tcl_SetHashValue(hPtr, varPtr);
|
280 |
varPtr->hPtr = hPtr;
|
281 |
varPtr->nsPtr = varNsPtr;
|
282 |
} else { /* var wasn't found and not to create it */
|
283 |
if (flags & TCL_LEAVE_ERR_MSG) {
|
284 |
VarErrMsg(interp, part1, part2, msg, noSuchVar);
|
285 |
}
|
286 |
goto done;
|
287 |
}
|
288 |
}
|
289 |
} else { /* local var: look in frame varFramePtr */
|
290 |
Proc *procPtr = varFramePtr->procPtr;
|
291 |
int localCt = procPtr->numCompiledLocals;
|
292 |
CompiledLocal *localPtr = procPtr->firstLocalPtr;
|
293 |
Var *localVarPtr = varFramePtr->compiledLocals;
|
294 |
int part1Len = strlen(part1);
|
295 |
|
296 |
for (i = 0; i < localCt; i++) {
|
297 |
if (!TclIsVarTemporary(localPtr)) {
|
298 |
register char *localName = localVarPtr->name;
|
299 |
if ((part1[0] == localName[0])
|
300 |
&& (part1Len == localPtr->nameLength)
|
301 |
&& (strcmp(part1, localName) == 0)) {
|
302 |
varPtr = localVarPtr;
|
303 |
break;
|
304 |
}
|
305 |
}
|
306 |
localVarPtr++;
|
307 |
localPtr = localPtr->nextPtr;
|
308 |
}
|
309 |
if (varPtr == NULL) { /* look in the frame's var hash table */
|
310 |
tablePtr = varFramePtr->varTablePtr;
|
311 |
if (createPart1) {
|
312 |
if (tablePtr == NULL) {
|
313 |
tablePtr = (Tcl_HashTable *)
|
314 |
ckalloc(sizeof(Tcl_HashTable));
|
315 |
Tcl_InitHashTable(tablePtr, TCL_STRING_KEYS);
|
316 |
varFramePtr->varTablePtr = tablePtr;
|
317 |
}
|
318 |
hPtr = Tcl_CreateHashEntry(tablePtr, part1, &new);
|
319 |
if (new) {
|
320 |
varPtr = NewVar();
|
321 |
Tcl_SetHashValue(hPtr, varPtr);
|
322 |
varPtr->hPtr = hPtr;
|
323 |
varPtr->nsPtr = NULL; /* a local variable */
|
324 |
} else {
|
325 |
varPtr = (Var *) Tcl_GetHashValue(hPtr);
|
326 |
}
|
327 |
} else {
|
328 |
hPtr = NULL;
|
329 |
if (tablePtr != NULL) {
|
330 |
hPtr = Tcl_FindHashEntry(tablePtr, part1);
|
331 |
}
|
332 |
if (hPtr == NULL) {
|
333 |
if (flags & TCL_LEAVE_ERR_MSG) {
|
334 |
VarErrMsg(interp, part1, part2, msg, noSuchVar);
|
335 |
}
|
336 |
goto done;
|
337 |
}
|
338 |
varPtr = (Var *) Tcl_GetHashValue(hPtr);
|
339 |
}
|
340 |
}
|
341 |
}
|
342 |
|
343 |
lookupVarPart2:
|
344 |
if (openParen != NULL) {
|
345 |
*openParen = '(';
|
346 |
openParen = NULL;
|
347 |
}
|
348 |
|
349 |
/*
|
350 |
* If varPtr is a link variable, we have a reference to some variable
|
351 |
* that was created through an "upvar" or "global" command. Traverse
|
352 |
* through any links until we find the referenced variable.
|
353 |
*/
|
354 |
|
355 |
while (TclIsVarLink(varPtr)) {
|
356 |
varPtr = varPtr->value.linkPtr;
|
357 |
}
|
358 |
|
359 |
/*
|
360 |
* If we're not dealing with an array element, return varPtr.
|
361 |
*/
|
362 |
|
363 |
if (elName == NULL) {
|
364 |
goto done;
|
365 |
}
|
366 |
|
367 |
/*
|
368 |
* We're dealing with an array element. Make sure the variable is an
|
369 |
* array and look up the element (create the element if desired).
|
370 |
*/
|
371 |
|
372 |
if (TclIsVarUndefined(varPtr) && !TclIsVarArrayElement(varPtr)) {
|
373 |
if (!createPart1) {
|
374 |
if (flags & TCL_LEAVE_ERR_MSG) {
|
375 |
VarErrMsg(interp, part1, part2, msg, noSuchVar);
|
376 |
}
|
377 |
varPtr = NULL;
|
378 |
goto done;
|
379 |
}
|
380 |
|
381 |
/*
|
382 |
* Make sure we are not resurrecting a namespace variable from a
|
383 |
* deleted namespace!
|
384 |
*/
|
385 |
if ((varPtr->flags & VAR_IN_HASHTABLE) && (varPtr->hPtr == NULL)) {
|
386 |
if (flags & TCL_LEAVE_ERR_MSG) {
|
387 |
VarErrMsg(interp, part1, part2, msg, danglingVar);
|
388 |
}
|
389 |
varPtr = NULL;
|
390 |
goto done;
|
391 |
}
|
392 |
|
393 |
TclSetVarArray(varPtr);
|
394 |
TclClearVarUndefined(varPtr);
|
395 |
varPtr->value.tablePtr =
|
396 |
(Tcl_HashTable *) ckalloc(sizeof(Tcl_HashTable));
|
397 |
Tcl_InitHashTable(varPtr->value.tablePtr, TCL_STRING_KEYS);
|
398 |
} else if (!TclIsVarArray(varPtr)) {
|
399 |
if (flags & TCL_LEAVE_ERR_MSG) {
|
400 |
VarErrMsg(interp, part1, part2, msg, needArray);
|
401 |
}
|
402 |
varPtr = NULL;
|
403 |
goto done;
|
404 |
}
|
405 |
*arrayPtrPtr = varPtr;
|
406 |
if (closeParen != NULL) {
|
407 |
*closeParen = 0;
|
408 |
}
|
409 |
if (createPart2) {
|
410 |
hPtr = Tcl_CreateHashEntry(varPtr->value.tablePtr, elName, &new);
|
411 |
if (closeParen != NULL) {
|
412 |
*closeParen = ')';
|
413 |
}
|
414 |
if (new) {
|
415 |
if (varPtr->searchPtr != NULL) {
|
416 |
DeleteSearches(varPtr);
|
417 |
}
|
418 |
varPtr = NewVar();
|
419 |
Tcl_SetHashValue(hPtr, varPtr);
|
420 |
varPtr->hPtr = hPtr;
|
421 |
varPtr->nsPtr = varNsPtr;
|
422 |
TclSetVarArrayElement(varPtr);
|
423 |
}
|
424 |
} else {
|
425 |
hPtr = Tcl_FindHashEntry(varPtr->value.tablePtr, elName);
|
426 |
if (closeParen != NULL) {
|
427 |
*closeParen = ')';
|
428 |
}
|
429 |
if (hPtr == NULL) {
|
430 |
if (flags & TCL_LEAVE_ERR_MSG) {
|
431 |
VarErrMsg(interp, part1, part2, msg, noSuchElement);
|
432 |
}
|
433 |
varPtr = NULL;
|
434 |
goto done;
|
435 |
}
|
436 |
}
|
437 |
varPtr = (Var *) Tcl_GetHashValue(hPtr);
|
438 |
|
439 |
done:
|
440 |
if (openParen != NULL) {
|
441 |
*openParen = '(';
|
442 |
}
|
443 |
return varPtr;
|
444 |
}
|
445 |
|
446 |
/*
|
447 |
*----------------------------------------------------------------------
|
448 |
*
|
449 |
* Tcl_GetVar --
|
450 |
*
|
451 |
* Return the value of a Tcl variable as a string.
|
452 |
*
|
453 |
* Results:
|
454 |
* The return value points to the current value of varName as a string.
|
455 |
* If the variable is not defined or can't be read because of a clash
|
456 |
* in array usage then a NULL pointer is returned and an error message
|
457 |
* is left in the interp's result if the TCL_LEAVE_ERR_MSG flag is set.
|
458 |
* Note: the return value is only valid up until the next change to the
|
459 |
* variable; if you depend on the value lasting longer than that, then
|
460 |
* make yourself a private copy.
|
461 |
*
|
462 |
* Side effects:
|
463 |
* None.
|
464 |
*
|
465 |
*----------------------------------------------------------------------
|
466 |
*/
|
467 |
|
468 |
char *
|
469 |
Tcl_GetVar(interp, varName, flags)
|
470 |
Tcl_Interp *interp; /* Command interpreter in which varName is
|
471 |
* to be looked up. */
|
472 |
char *varName; /* Name of a variable in interp. */
|
473 |
int flags; /* OR-ed combination of TCL_GLOBAL_ONLY,
|
474 |
* TCL_NAMESPACE_ONLY or TCL_LEAVE_ERR_MSG
|
475 |
* bits. */
|
476 |
{
|
477 |
return Tcl_GetVar2(interp, varName, (char *) NULL, flags);
|
478 |
}
|
479 |
|
480 |
/*
|
481 |
*----------------------------------------------------------------------
|
482 |
*
|
483 |
* Tcl_GetVar2 --
|
484 |
*
|
485 |
* Return the value of a Tcl variable as a string, given a two-part
|
486 |
* name consisting of array name and element within array.
|
487 |
*
|
488 |
* Results:
|
489 |
* The return value points to the current value of the variable given
|
490 |
* by part1 and part2 as a string. If the specified variable doesn't
|
491 |
* exist, or if there is a clash in array usage, then NULL is returned
|
492 |
* and a message will be left in the interp's result if the
|
493 |
* TCL_LEAVE_ERR_MSG flag is set. Note: the return value is only valid
|
494 |
* up until the next change to the variable; if you depend on the value
|
495 |
* lasting longer than that, then make yourself a private copy.
|
496 |
*
|
497 |
* Side effects:
|
498 |
* None.
|
499 |
*
|
500 |
*----------------------------------------------------------------------
|
501 |
*/
|
502 |
|
503 |
char *
|
504 |
Tcl_GetVar2(interp, part1, part2, flags)
|
505 |
Tcl_Interp *interp; /* Command interpreter in which variable is
|
506 |
* to be looked up. */
|
507 |
char *part1; /* Name of an array (if part2 is non-NULL)
|
508 |
* or the name of a variable. */
|
509 |
char *part2; /* If non-NULL, gives the name of an element
|
510 |
* in the array part1. */
|
511 |
int flags; /* OR-ed combination of TCL_GLOBAL_ONLY,
|
512 |
* TCL_NAMESPACE_ONLY and TCL_LEAVE_ERR_MSG
|
513 |
* bits. */
|
514 |
{
|
515 |
Tcl_Obj *objPtr;
|
516 |
|
517 |
objPtr = Tcl_GetVar2Ex(interp, part1, part2, flags);
|
518 |
if (objPtr == NULL) {
|
519 |
return NULL;
|
520 |
}
|
521 |
return TclGetString(objPtr);
|
522 |
}
|
523 |
/*
|
524 |
*----------------------------------------------------------------------
|
525 |
*
|
526 |
* Tcl_ObjGetVar2 --
|
527 |
*
|
528 |
* Return the value of a Tcl variable as a Tcl object, given a
|
529 |
* two-part name consisting of array name and element within array.
|
530 |
*
|
531 |
* Results:
|
532 |
* The return value points to the current object value of the variable
|
533 |
* given by part1Ptr and part2Ptr. If the specified variable doesn't
|
534 |
* exist, or if there is a clash in array usage, then NULL is returned
|
535 |
* and a message will be left in the interpreter's result if the
|
536 |
* TCL_LEAVE_ERR_MSG flag is set.
|
537 |
*
|
538 |
* Side effects:
|
539 |
* The ref count for the returned object is _not_ incremented to
|
540 |
* reflect the returned reference; if you want to keep a reference to
|
541 |
* the object you must increment its ref count yourself.
|
542 |
*
|
543 |
*----------------------------------------------------------------------
|
544 |
*/
|
545 |
|
546 |
Tcl_Obj *
|
547 |
Tcl_ObjGetVar2(interp, part1Ptr, part2Ptr, flags)
|
548 |
Tcl_Interp *interp; /* Command interpreter in which variable is
|
549 |
* to be looked up. */
|
550 |
register Tcl_Obj *part1Ptr; /* Points to an object holding the name of
|
551 |
* an array (if part2 is non-NULL) or the
|
552 |
* name of a variable. */
|
553 |
register Tcl_Obj *part2Ptr; /* If non-null, points to an object holding
|
554 |
* the name of an element in the array
|
555 |
* part1Ptr. */
|
556 |
int flags; /* OR-ed combination of TCL_GLOBAL_ONLY,
|
557 |
* TCL_LEAVE_ERR_MSG, and
|
558 |
* TCL_PARSE_PART1 bits. */
|
559 |
{
|
560 |
char *part1, *part2;
|
561 |
|
562 |
part1 = Tcl_GetString(part1Ptr);
|
563 |
if (part2Ptr != NULL) {
|
564 |
part2 = Tcl_GetString(part2Ptr);
|
565 |
} else {
|
566 |
part2 = NULL;
|
567 |
}
|
568 |
|
569 |
return Tcl_GetVar2Ex(interp, part1, part2, flags);
|
570 |
}
|
571 |
|
572 |
/*
|
573 |
*----------------------------------------------------------------------
|
574 |
*
|
575 |
* Tcl_GetVar2Ex --
|
576 |
*
|
577 |
* Return the value of a Tcl variable as a Tcl object, given a
|
578 |
* two-part name consisting of array name and element within array.
|
579 |
*
|
580 |
* Results:
|
581 |
* The return value points to the current object value of the variable
|
582 |
* given by part1Ptr and part2Ptr. If the specified variable doesn't
|
583 |
* exist, or if there is a clash in array usage, then NULL is returned
|
584 |
* and a message will be left in the interpreter's result if the
|
585 |
* TCL_LEAVE_ERR_MSG flag is set.
|
586 |
*
|
587 |
* Side effects:
|
588 |
* The ref count for the returned object is _not_ incremented to
|
589 |
* reflect the returned reference; if you want to keep a reference to
|
590 |
* the object you must increment its ref count yourself.
|
591 |
*
|
592 |
*----------------------------------------------------------------------
|
593 |
*/
|
594 |
|
595 |
Tcl_Obj *
|
596 |
Tcl_GetVar2Ex(interp, part1, part2, flags)
|
597 |
Tcl_Interp *interp; /* Command interpreter in which variable is
|
598 |
* to be looked up. */
|
599 |
char *part1; /* Name of an array (if part2 is non-NULL)
|
600 |
* or the name of a variable. */
|
601 |
char *part2; /* If non-NULL, gives the name of an element
|
602 |
* in the array part1. */
|
603 |
int flags; /* OR-ed combination of TCL_GLOBAL_ONLY,
|
604 |
* and TCL_LEAVE_ERR_MSG bits. */
|
605 |
{
|
606 |
Interp *iPtr = (Interp *) interp;
|
607 |
register Var *varPtr;
|
608 |
Var *arrayPtr;
|
609 |
char *msg;
|
610 |
|
611 |
varPtr = TclLookupVar(interp, part1, part2, flags, "read",
|
612 |
/*createPart1*/ 0, /*createPart2*/ 1, &arrayPtr);
|
613 |
if (varPtr == NULL) {
|
614 |
return NULL;
|
615 |
}
|
616 |
|
617 |
/*
|
618 |
* Invoke any traces that have been set for the variable.
|
619 |
*/
|
620 |
|
621 |
if ((varPtr->tracePtr != NULL)
|
622 |
|| ((arrayPtr != NULL) && (arrayPtr->tracePtr != NULL))) {
|
623 |
msg = CallTraces(iPtr, arrayPtr, varPtr, part1, part2,
|
624 |
(flags & (TCL_NAMESPACE_ONLY|TCL_GLOBAL_ONLY)) | TCL_TRACE_READS);
|
625 |
if (msg != NULL) {
|
626 |
if (flags & TCL_LEAVE_ERR_MSG) {
|
627 |
VarErrMsg(interp, part1, part2, "read", msg);
|
628 |
}
|
629 |
goto errorReturn;
|
630 |
}
|
631 |
}
|
632 |
|
633 |
/*
|
634 |
* Return the element if it's an existing scalar variable.
|
635 |
*/
|
636 |
|
637 |
if (TclIsVarScalar(varPtr) && !TclIsVarUndefined(varPtr)) {
|
638 |
return varPtr->value.objPtr;
|
639 |
}
|
640 |
|
641 |
if (flags & TCL_LEAVE_ERR_MSG) {
|
642 |
if (TclIsVarUndefined(varPtr) && (arrayPtr != NULL)
|
643 |
&& !TclIsVarUndefined(arrayPtr)) {
|
644 |
msg = noSuchElement;
|
645 |
} else if (TclIsVarArray(varPtr)) {
|
646 |
msg = isArray;
|
647 |
} else {
|
648 |
msg = noSuchVar;
|
649 |
}
|
650 |
VarErrMsg(interp, part1, part2, "read", msg);
|
651 |
}
|
652 |
|
653 |
/*
|
654 |
* An error. If the variable doesn't exist anymore and no-one's using
|
655 |
* it, then free up the relevant structures and hash table entries.
|
656 |
*/
|
657 |
|
658 |
errorReturn:
|
659 |
if (TclIsVarUndefined(varPtr)) {
|
660 |
CleanupVar(varPtr, arrayPtr);
|
661 |
}
|
662 |
return NULL;
|
663 |
}
|
664 |
|
665 |
/*
|
666 |
*----------------------------------------------------------------------
|
667 |
*
|
668 |
* TclGetIndexedScalar --
|
669 |
*
|
670 |
* Return the Tcl object value of a local scalar variable in the active
|
671 |
* procedure, given its index in the procedure's array of compiler
|
672 |
* allocated local variables.
|
673 |
*
|
674 |
* Results:
|
675 |
* The return value points to the current object value of the variable
|
676 |
* given by localIndex. If the specified variable doesn't exist, or
|
677 |
* there is a clash in array usage, or an error occurs while executing
|
678 |
* variable traces, then NULL is returned and a message will be left in
|
679 |
* the interpreter's result if leaveErrorMsg is 1.
|
680 |
*
|
681 |
* Side effects:
|
682 |
* The ref count for the returned object is _not_ incremented to
|
683 |
* reflect the returned reference; if you want to keep a reference to
|
684 |
* the object you must increment its ref count yourself.
|
685 |
*
|
686 |
*----------------------------------------------------------------------
|
687 |
*/
|
688 |
|
689 |
Tcl_Obj *
|
690 |
TclGetIndexedScalar(interp, localIndex, leaveErrorMsg)
|
691 |
Tcl_Interp *interp; /* Command interpreter in which variable is
|
692 |
* to be looked up. */
|
693 |
register int localIndex; /* Index of variable in procedure's array
|
694 |
* of local variables. */
|
695 |
int leaveErrorMsg; /* 1 if to leave an error message in
|
696 |
* interpreter's result on an error.
|
697 |
* Otherwise no error message is left. */
|
698 |
{
|
699 |
Interp *iPtr = (Interp *) interp;
|
700 |
CallFrame *varFramePtr = iPtr->varFramePtr;
|
701 |
/* Points to the procedure call frame whose
|
702 |
* variables are currently in use. Same as
|
703 |
* the current procedure's frame, if any,
|
704 |
* unless an "uplevel" is executing. */
|
705 |
Var *compiledLocals = varFramePtr->compiledLocals;
|
706 |
register Var *varPtr; /* Points to the variable's in-frame Var
|
707 |
* structure. */
|
708 |
char *varName; /* Name of the local variable. */
|
709 |
char *msg;
|
710 |
|
711 |
#ifdef TCL_COMPILE_DEBUG
|
712 |
int localCt = varFramePtr->procPtr->numCompiledLocals;
|
713 |
|
714 |
if (compiledLocals == NULL) {
|
715 |
fprintf(stderr, "\nTclGetIndexedScalar: can't get local %i in frame 0x%x, no compiled locals\n",
|
716 |
localIndex, (unsigned int) varFramePtr);
|
717 |
panic("TclGetIndexedScalar: no compiled locals in frame 0x%x",
|
718 |
(unsigned int) varFramePtr);
|
719 |
}
|
720 |
if ((localIndex < 0) || (localIndex >= localCt)) {
|
721 |
fprintf(stderr, "\nTclGetIndexedScalar: can't get local %i in frame 0x%x with %i locals\n",
|
722 |
localIndex, (unsigned int) varFramePtr, localCt);
|
723 |
panic("TclGetIndexedScalar: bad local index %i in frame 0x%x",
|
724 |
localIndex, (unsigned int) varFramePtr);
|
725 |
}
|
726 |
#endif /* TCL_COMPILE_DEBUG */
|
727 |
|
728 |
varPtr = &(compiledLocals[localIndex]);
|
729 |
varName = varPtr->name;
|
730 |
|
731 |
/*
|
732 |
* If varPtr is a link variable, we have a reference to some variable
|
733 |
* that was created through an "upvar" or "global" command, or we have a
|
734 |
* reference to a variable in an enclosing namespace. Traverse through
|
735 |
* any links until we find the referenced variable.
|
736 |
*/
|
737 |
|
738 |
while (TclIsVarLink(varPtr)) {
|
739 |
varPtr = varPtr->value.linkPtr;
|
740 |
}
|
741 |
|
742 |
/*
|
743 |
* Invoke any traces that have been set for the variable.
|
744 |
*/
|
745 |
|
746 |
if (varPtr->tracePtr != NULL) {
|
747 |
msg = CallTraces(iPtr, /*arrayPtr*/ NULL, varPtr, varName, NULL,
|
748 |
TCL_TRACE_READS);
|
749 |
if (msg != NULL) {
|
750 |
if (leaveErrorMsg) {
|
751 |
VarErrMsg(interp, varName, NULL, "read", msg);
|
752 |
}
|
753 |
return NULL;
|
754 |
}
|
755 |
}
|
756 |
|
757 |
/*
|
758 |
* Make sure we're dealing with a scalar variable and not an array, and
|
759 |
* that the variable exists (isn't undefined).
|
760 |
*/
|
761 |
|
762 |
if (!TclIsVarScalar(varPtr) || TclIsVarUndefined(varPtr)) {
|
763 |
if (leaveErrorMsg) {
|
764 |
if (TclIsVarArray(varPtr)) {
|
765 |
msg = isArray;
|
766 |
} else {
|
767 |
msg = noSuchVar;
|
768 |
}
|
769 |
VarErrMsg(interp, varName, NULL, "read", msg);
|
770 |
|
771 |
}
|
772 |
return NULL;
|
773 |
}
|
774 |
return varPtr->value.objPtr;
|
775 |
}
|
776 |
|
777 |
/*
|
778 |
*----------------------------------------------------------------------
|
779 |
*
|
780 |
* TclGetElementOfIndexedArray --
|
781 |
*
|
782 |
* Return the Tcl object value for an element in a local array
|
783 |
* variable. The element is named by the object elemPtr while the
|
784 |
* array is specified by its index in the active procedure's array
|
785 |
* of compiler allocated local variables.
|
786 |
*
|
787 |
* Results:
|
788 |
* The return value points to the current object value of the
|
789 |
* element. If the specified array or element doesn't exist, or there
|
790 |
* is a clash in array usage, or an error occurs while executing
|
791 |
* variable traces, then NULL is returned and a message will be left in
|
792 |
* the interpreter's result if leaveErrorMsg is 1.
|
793 |
*
|
794 |
* Side effects:
|
795 |
* The ref count for the returned object is _not_ incremented to
|
796 |
* reflect the returned reference; if you want to keep a reference to
|
797 |
* the object you must increment its ref count yourself.
|
798 |
*
|
799 |
*----------------------------------------------------------------------
|
800 |
*/
|
801 |
|
802 |
Tcl_Obj *
|
803 |
TclGetElementOfIndexedArray(interp, localIndex, elemPtr, leaveErrorMsg)
|
804 |
Tcl_Interp *interp; /* Command interpreter in which variable is
|
805 |
* to be looked up. */
|
806 |
int localIndex; /* Index of array variable in procedure's
|
807 |
* array of local variables. */
|
808 |
Tcl_Obj *elemPtr; /* Points to an object holding the name of
|
809 |
* an element to get in the array. */
|
810 |
int leaveErrorMsg; /* 1 if to leave an error message in
|
811 |
* the interpreter's result on an error.
|
812 |
* Otherwise no error message is left. */
|
813 |
{
|
814 |
Interp *iPtr = (Interp *) interp;
|
815 |
CallFrame *varFramePtr = iPtr->varFramePtr;
|
816 |
/* Points to the procedure call frame whose
|
817 |
* variables are currently in use. Same as
|
818 |
* the current procedure's frame, if any,
|
819 |
* unless an "uplevel" is executing. */
|
820 |
Var *compiledLocals = varFramePtr->compiledLocals;
|
821 |
Var *arrayPtr; /* Points to the array's in-frame Var
|
822 |
* structure. */
|
823 |
char *arrayName; /* Name of the local array. */
|
824 |
Tcl_HashEntry *hPtr;
|
825 |
Var *varPtr = NULL; /* Points to the element's Var structure
|
826 |
* that we return. Initialized to avoid
|
827 |
* compiler warning. */
|
828 |
char *elem, *msg;
|
829 |
int new;
|
830 |
|
831 |
#ifdef TCL_COMPILE_DEBUG
|
832 |
Proc *procPtr = varFramePtr->procPtr;
|
833 |
int localCt = procPtr->numCompiledLocals;
|
834 |
|
835 |
if (compiledLocals == NULL) {
|
836 |
fprintf(stderr, "\nTclGetElementOfIndexedArray: can't get element of local %i in frame 0x%x, no compiled locals\n",
|
837 |
localIndex, (unsigned int) varFramePtr);
|
838 |
panic("TclGetIndexedScalar: no compiled locals in frame 0x%x",
|
839 |
(unsigned int) varFramePtr);
|
840 |
}
|
841 |
if ((localIndex < 0) || (localIndex >= localCt)) {
|
842 |
fprintf(stderr, "\nTclGetIndexedScalar: can't get element of local %i in frame 0x%x with %i locals\n",
|
843 |
localIndex, (unsigned int) varFramePtr, localCt);
|
844 |
panic("TclGetElementOfIndexedArray: bad local index %i in frame 0x%x",
|
845 |
localIndex, (unsigned int) varFramePtr);
|
846 |
}
|
847 |
#endif /* TCL_COMPILE_DEBUG */
|
848 |
|
849 |
elem = TclGetString(elemPtr);
|
850 |
arrayPtr = &(compiledLocals[localIndex]);
|
851 |
arrayName = arrayPtr->name;
|
852 |
|
853 |
/*
|
854 |
* If arrayPtr is a link variable, we have a reference to some variable
|
855 |
* that was created through an "upvar" or "global" command, or we have a
|
856 |
* reference to a variable in an enclosing namespace. Traverse through
|
857 |
* any links until we find the referenced variable.
|
858 |
*/
|
859 |
|
860 |
while (TclIsVarLink(arrayPtr)) {
|
861 |
arrayPtr = arrayPtr->value.linkPtr;
|
862 |
}
|
863 |
|
864 |
/*
|
865 |
* Make sure we're dealing with an array and that the array variable
|
866 |
* exists (isn't undefined).
|
867 |
*/
|
868 |
|
869 |
if (!TclIsVarArray(arrayPtr) || TclIsVarUndefined(arrayPtr)) {
|
870 |
if (leaveErrorMsg) {
|
871 |
VarErrMsg(interp, arrayName, elem, "read", noSuchVar);
|
872 |
}
|
873 |
goto errorReturn;
|
874 |
}
|
875 |
|
876 |
/*
|
877 |
* Look up the element. Note that we must create the element (but leave
|
878 |
* it marked undefined) if it does not already exist. This allows a
|
879 |
* trace to create new array elements "on the fly" that did not exist
|
880 |
* before. A trace is always passed a variable for the array element. If
|
881 |
* the trace does not define the variable, it will be deleted below (at
|
882 |
* errorReturn) and an error returned.
|
883 |
*/
|
884 |
|
885 |
hPtr = Tcl_CreateHashEntry(arrayPtr->value.tablePtr, elem, &new);
|
886 |
if (new) {
|
887 |
if (arrayPtr->searchPtr != NULL) {
|
888 |
DeleteSearches(arrayPtr);
|
889 |
}
|
890 |
varPtr = NewVar();
|
891 |
Tcl_SetHashValue(hPtr, varPtr);
|
892 |
varPtr->hPtr = hPtr;
|
893 |
varPtr->nsPtr = varFramePtr->nsPtr;
|
894 |
TclSetVarArrayElement(varPtr);
|
895 |
} else {
|
896 |
varPtr = (Var *) Tcl_GetHashValue(hPtr);
|
897 |
}
|
898 |
|
899 |
/*
|
900 |
* Invoke any traces that have been set for the element variable.
|
901 |
*/
|
902 |
|
903 |
if ((varPtr->tracePtr != NULL)
|
904 |
|| ((arrayPtr != NULL) && (arrayPtr->tracePtr != NULL))) {
|
905 |
msg = CallTraces(iPtr, arrayPtr, varPtr, arrayName, elem,
|
906 |
TCL_TRACE_READS);
|
907 |
if (msg != NULL) {
|
908 |
if (leaveErrorMsg) {
|
909 |
VarErrMsg(interp, arrayName, elem, "read", msg);
|
910 |
}
|
911 |
goto errorReturn;
|
912 |
}
|
913 |
}
|
914 |
|
915 |
/*
|
916 |
* Return the element if it's an existing scalar variable.
|
917 |
*/
|
918 |
|
919 |
if (TclIsVarScalar(varPtr) && !TclIsVarUndefined(varPtr)) {
|
920 |
return varPtr->value.objPtr;
|
921 |
}
|
922 |
|
923 |
if (leaveErrorMsg) {
|
924 |
if (TclIsVarArray(varPtr)) {
|
925 |
msg = isArray;
|
926 |
} else {
|
927 |
msg = noSuchVar;
|
928 |
}
|
929 |
VarErrMsg(interp, arrayName, elem, "read", msg);
|
930 |
}
|
931 |
|
932 |
/*
|
933 |
* An error. If the variable doesn't exist anymore and no-one's using
|
934 |
* it, then free up the relevant structures and hash table entries.
|
935 |
*/
|
936 |
|
937 |
errorReturn:
|
938 |
if ((varPtr != NULL) && TclIsVarUndefined(varPtr)) {
|
939 |
CleanupVar(varPtr, NULL); /* the array is not in a hashtable */
|
940 |
}
|
941 |
return NULL;
|
942 |
}
|
943 |
|
944 |
/*
|
945 |
*----------------------------------------------------------------------
|
946 |
*
|
947 |
* Tcl_SetObjCmd --
|
948 |
*
|
949 |
* This procedure is invoked to process the "set" Tcl command.
|
950 |
* See the user documentation for details on what it does.
|
951 |
*
|
952 |
* Results:
|
953 |
* A standard Tcl result value.
|
954 |
*
|
955 |
* Side effects:
|
956 |
* A variable's value may be changed.
|
957 |
*
|
958 |
*----------------------------------------------------------------------
|
959 |
*/
|
960 |
|
961 |
/* ARGSUSED */
|
962 |
int
|
963 |
Tcl_SetObjCmd(dummy, interp, objc, objv)
|
964 |
ClientData dummy; /* Not used. */
|
965 |
register Tcl_Interp *interp; /* Current interpreter. */
|
966 |
int objc; /* Number of arguments. */
|
967 |
Tcl_Obj *CONST objv[]; /* Argument objects. */
|
968 |
{
|
969 |
Tcl_Obj *varValueObj;
|
970 |
|
971 |
if (objc == 2) {
|
972 |
varValueObj = Tcl_ObjGetVar2(interp, objv[1], NULL, TCL_LEAVE_ERR_MSG);
|
973 |
if (varValueObj == NULL) {
|
974 |
return TCL_ERROR;
|
975 |
}
|
976 |
Tcl_SetObjResult(interp, varValueObj);
|
977 |
return TCL_OK;
|
978 |
} else if (objc == 3) {
|
979 |
|
980 |
varValueObj = Tcl_ObjSetVar2(interp, objv[1], NULL, objv[2],
|
981 |
TCL_LEAVE_ERR_MSG);
|
982 |
if (varValueObj == NULL) {
|
983 |
return TCL_ERROR;
|
984 |
}
|
985 |
Tcl_SetObjResult(interp, varValueObj);
|
986 |
return TCL_OK;
|
987 |
} else {
|
988 |
Tcl_WrongNumArgs(interp, 1, objv, "varName ?newValue?");
|
989 |
return TCL_ERROR;
|
990 |
}
|
991 |
}
|
992 |
|
993 |
/*
|
994 |
*----------------------------------------------------------------------
|
995 |
*
|
996 |
* Tcl_SetVar --
|
997 |
*
|
998 |
* Change the value of a variable.
|
999 |
*
|
1000 |
* Results:
|
1001 |
* Returns a pointer to the malloc'ed string which is the character
|
1002 |
* representation of the variable's new value. The caller must not
|
1003 |
* modify this string. If the write operation was disallowed then NULL
|
1004 |
* is returned; if the TCL_LEAVE_ERR_MSG flag is set, then an
|
1005 |
* explanatory message will be left in the interp's result. Note that the
|
1006 |
* returned string may not be the same as newValue; this is because
|
1007 |
* variable traces may modify the variable's value.
|
1008 |
*
|
1009 |
* Side effects:
|
1010 |
* If varName is defined as a local or global variable in interp,
|
1011 |
* its value is changed to newValue. If varName isn't currently
|
1012 |
* defined, then a new global variable by that name is created.
|
1013 |
*
|
1014 |
*----------------------------------------------------------------------
|
1015 |
*/
|
1016 |
|
1017 |
char *
|
1018 |
Tcl_SetVar(interp, varName, newValue, flags)
|
1019 |
Tcl_Interp *interp; /* Command interpreter in which varName is
|
1020 |
* to be looked up. */
|
1021 |
char *varName; /* Name of a variable in interp. */
|
1022 |
char *newValue; /* New value for varName. */
|
1023 |
int flags; /* Various flags that tell how to set value:
|
1024 |
* any of TCL_GLOBAL_ONLY,
|
1025 |
* TCL_NAMESPACE_ONLY, TCL_APPEND_VALUE,
|
1026 |
* TCL_LIST_ELEMENT, TCL_LEAVE_ERR_MSG. */
|
1027 |
{
|
1028 |
return Tcl_SetVar2(interp, varName, (char *) NULL, newValue, flags);
|
1029 |
}
|
1030 |
|
1031 |
/*
|
1032 |
*----------------------------------------------------------------------
|
1033 |
*
|
1034 |
* Tcl_SetVar2 --
|
1035 |
*
|
1036 |
* Given a two-part variable name, which may refer either to a
|
1037 |
* scalar variable or an element of an array, change the value
|
1038 |
* of the variable. If the named scalar or array or element
|
1039 |
* doesn't exist then create one.
|
1040 |
*
|
1041 |
* Results:
|
1042 |
* Returns a pointer to the malloc'ed string which is the character
|
1043 |
* representation of the variable's new value. The caller must not
|
1044 |
* modify this string. If the write operation was disallowed because an
|
1045 |
* array was expected but not found (or vice versa), then NULL is
|
1046 |
* returned; if the TCL_LEAVE_ERR_MSG flag is set, then an explanatory
|
1047 |
* message will be left in the interp's result. Note that the returned
|
1048 |
* string may not be the same as newValue; this is because variable
|
1049 |
* traces may modify the variable's value.
|
1050 |
*
|
1051 |
* Side effects:
|
1052 |
* The value of the given variable is set. If either the array
|
1053 |
* or the entry didn't exist then a new one is created.
|
1054 |
*
|
1055 |
*----------------------------------------------------------------------
|
1056 |
*/
|
1057 |
|
1058 |
char *
|
1059 |
Tcl_SetVar2(interp, part1, part2, newValue, flags)
|
1060 |
Tcl_Interp *interp; /* Command interpreter in which variable is
|
1061 |
* to be looked up. */
|
1062 |
char *part1; /* If part2 is NULL, this is name of scalar
|
1063 |
* variable. Otherwise it is the name of
|
1064 |
* an array. */
|
1065 |
char *part2; /* Name of an element within an array, or
|
1066 |
* NULL. */
|
1067 |
char *newValue; /* New value for variable. */
|
1068 |
int flags; /* Various flags that tell how to set value:
|
1069 |
* any of TCL_GLOBAL_ONLY,
|
1070 |
* TCL_NAMESPACE_ONLY, TCL_APPEND_VALUE,
|
1071 |
* TCL_LIST_ELEMENT, or TCL_LEAVE_ERR_MSG */
|
1072 |
{
|
1073 |
register Tcl_Obj *valuePtr;
|
1074 |
Tcl_Obj *varValuePtr;
|
1075 |
|
1076 |
/*
|
1077 |
* Create an object holding the variable's new value and use
|
1078 |
* Tcl_SetVar2Ex to actually set the variable.
|
1079 |
*/
|
1080 |
|
1081 |
valuePtr = Tcl_NewStringObj(newValue, -1);
|
1082 |
Tcl_IncrRefCount(valuePtr);
|
1083 |
|
1084 |
varValuePtr = Tcl_SetVar2Ex(interp, part1, part2, valuePtr, flags);
|
1085 |
Tcl_DecrRefCount(valuePtr); /* done with the object */
|
1086 |
|
1087 |
if (varValuePtr == NULL) {
|
1088 |
return NULL;
|
1089 |
}
|
1090 |
return TclGetString(varValuePtr);
|
1091 |
}
|
1092 |
|
1093 |
/*
|
1094 |
*----------------------------------------------------------------------
|
1095 |
*
|
1096 |
* Tcl_ObjSetVar2 --
|
1097 |
*
|
1098 |
* This function is the same as Tcl_SetVar2Ex below, except the
|
1099 |
* variable names are passed in Tcl object instead of strings.
|
1100 |
*
|
1101 |
* Results:
|
1102 |
* Returns a pointer to the Tcl_Obj holding the new value of the
|
1103 |
* variable. If the write operation was disallowed because an array was
|
1104 |
* expected but not found (or vice versa), then NULL is returned; if
|
1105 |
* the TCL_LEAVE_ERR_MSG flag is set, then an explanatory message will
|
1106 |
* be left in the interpreter's result. Note that the returned object
|
1107 |
* may not be the same one referenced by newValuePtr; this is because
|
1108 |
* variable traces may modify the variable's value.
|
1109 |
*
|
1110 |
* Side effects:
|
1111 |
* The value of the given variable is set. If either the array or the
|
1112 |
* entry didn't exist then a new variable is created.
|
1113 |
|
1114 |
*
|
1115 |
*----------------------------------------------------------------------
|
1116 |
*/
|
1117 |
|
1118 |
Tcl_Obj *
|
1119 |
Tcl_ObjSetVar2(interp, part1Ptr, part2Ptr, newValuePtr, flags)
|
1120 |
Tcl_Interp *interp; /* Command interpreter in which variable is
|
1121 |
* to be found. */
|
1122 |
register Tcl_Obj *part1Ptr; /* Points to an object holding the name of
|
1123 |
* an array (if part2 is non-NULL) or the
|
1124 |
* name of a variable. */
|
1125 |
register Tcl_Obj *part2Ptr; /* If non-null, points to an object holding
|
1126 |
* the name of an element in the array
|
1127 |
* part1Ptr. */
|
1128 |
Tcl_Obj *newValuePtr; /* New value for variable. */
|
1129 |
int flags; /* Various flags that tell how to set value:
|
1130 |
* any of TCL_GLOBAL_ONLY,
|
1131 |
* TCL_NAMESPACE_ONLY, TCL_APPEND_VALUE,
|
1132 |
* TCL_LIST_ELEMENT, TCL_LEAVE_ERR_MSG, or
|
1133 |
* TCL_PARSE_PART1. */
|
1134 |
{
|
1135 |
char *part1, *part2;
|
1136 |
|
1137 |
part1 = Tcl_GetString(part1Ptr);
|
1138 |
if (part2Ptr != NULL) {
|
1139 |
part2 = Tcl_GetString(part2Ptr);
|
1140 |
} else {
|
1141 |
part2 = NULL;
|
1142 |
}
|
1143 |
|
1144 |
return Tcl_SetVar2Ex(interp, part1, part2, newValuePtr, flags);
|
1145 |
}
|
1146 |
|
1147 |
/*
|
1148 |
*----------------------------------------------------------------------
|
1149 |
*
|
1150 |
* Tcl_SetVar2Ex --
|
1151 |
*
|
1152 |
* Given a two-part variable name, which may refer either to a scalar
|
1153 |
* variable or an element of an array, change the value of the variable
|
1154 |
* to a new Tcl object value. If the named scalar or array or element
|
1155 |
* doesn't exist then create one.
|
1156 |
*
|
1157 |
* Results:
|
1158 |
* Returns a pointer to the Tcl_Obj holding the new value of the
|
1159 |
* variable. If the write operation was disallowed because an array was
|
1160 |
* expected but not found (or vice versa), then NULL is returned; if
|
1161 |
* the TCL_LEAVE_ERR_MSG flag is set, then an explanatory message will
|
1162 |
* be left in the interpreter's result. Note that the returned object
|
1163 |
* may not be the same one referenced by newValuePtr; this is because
|
1164 |
* variable traces may modify the variable's value.
|
1165 |
*
|
1166 |
* Side effects:
|
1167 |
* The value of the given variable is set. If either the array or the
|
1168 |
* entry didn't exist then a new variable is created.
|
1169 |
*
|
1170 |
* The reference count is decremented for any old value of the variable
|
1171 |
* and incremented for its new value. If the new value for the variable
|
1172 |
* is not the same one referenced by newValuePtr (perhaps as a result
|
1173 |
* of a variable trace), then newValuePtr's ref count is left unchanged
|
1174 |
* by Tcl_SetVar2Ex. newValuePtr's ref count is also left unchanged if
|
1175 |
* we are appending it as a string value: that is, if "flags" includes
|
1176 |
* TCL_APPEND_VALUE but not TCL_LIST_ELEMENT.
|
1177 |
*
|
1178 |
* The reference count for the returned object is _not_ incremented: if
|
1179 |
* you want to keep a reference to the object you must increment its
|
1180 |
* ref count yourself.
|
1181 |
*
|
1182 |
*----------------------------------------------------------------------
|
1183 |
*/
|
1184 |
|
1185 |
Tcl_Obj *
|
1186 |
Tcl_SetVar2Ex(interp, part1, part2, newValuePtr, flags)
|
1187 |
Tcl_Interp *interp; /* Command interpreter in which variable is
|
1188 |
* to be found. */
|
1189 |
char *part1; /* Name of an array (if part2 is non-NULL)
|
1190 |
* or the name of a variable. */
|
1191 |
char *part2; /* If non-NULL, gives the name of an element
|
1192 |
* in the array part1. */
|
1193 |
Tcl_Obj *newValuePtr; /* New value for variable. */
|
1194 |
int flags; /* Various flags that tell how to set value:
|
1195 |
* any of TCL_GLOBAL_ONLY,
|
1196 |
* TCL_NAMESPACE_ONLY, TCL_APPEND_VALUE,
|
1197 |
* TCL_LIST_ELEMENT or TCL_LEAVE_ERR_MSG. */
|
1198 |
{
|
1199 |
Interp *iPtr = (Interp *) interp;
|
1200 |
register Var *varPtr;
|
1201 |
Var *arrayPtr;
|
1202 |
Tcl_Obj *oldValuePtr;
|
1203 |
Tcl_Obj *resultPtr = NULL;
|
1204 |
char *bytes;
|
1205 |
int length, result;
|
1206 |
|
1207 |
varPtr = TclLookupVar(interp, part1, part2, flags, "set",
|
1208 |
/*createPart1*/ 1, /*createPart2*/ 1, &arrayPtr);
|
1209 |
if (varPtr == NULL) {
|
1210 |
return NULL;
|
1211 |
}
|
1212 |
|
1213 |
/*
|
1214 |
* If the variable is in a hashtable and its hPtr field is NULL, then we
|
1215 |
* may have an upvar to an array element where the array was deleted
|
1216 |
* or an upvar to a namespace variable whose namespace was deleted.
|
1217 |
* Generate an error (allowing the variable to be reset would screw up
|
1218 |
* our storage allocation and is meaningless anyway).
|
1219 |
*/
|
1220 |
|
1221 |
if ((varPtr->flags & VAR_IN_HASHTABLE) && (varPtr->hPtr == NULL)) {
|
1222 |
if (flags & TCL_LEAVE_ERR_MSG) {
|
1223 |
if (TclIsVarArrayElement(varPtr)) {
|
1224 |
VarErrMsg(interp, part1, part2, "set", danglingElement);
|
1225 |
} else {
|
1226 |
VarErrMsg(interp, part1, part2, "set", danglingVar);
|
1227 |
}
|
1228 |
}
|
1229 |
return NULL;
|
1230 |
}
|
1231 |
|
1232 |
/*
|
1233 |
* It's an error to try to set an array variable itself.
|
1234 |
*/
|
1235 |
|
1236 |
if (TclIsVarArray(varPtr) && !TclIsVarUndefined(varPtr)) {
|
1237 |
if (flags & TCL_LEAVE_ERR_MSG) {
|
1238 |
VarErrMsg(interp, part1, part2, "set", isArray);
|
1239 |
}
|
1240 |
return NULL;
|
1241 |
}
|
1242 |
|
1243 |
/*
|
1244 |
* At this point, if we were appending, we used to call read traces: we
|
1245 |
* treated append as a read-modify-write. However, it seemed unlikely to
|
1246 |
* us that a real program would be interested in such reads being done
|
1247 |
* during a set operation.
|
1248 |
*/
|
1249 |
|
1250 |
/*
|
1251 |
* Set the variable's new value. If appending, append the new value to
|
1252 |
* the variable, either as a list element or as a string. Also, if
|
1253 |
* appending, then if the variable's old value is unshared we can modify
|
1254 |
* it directly, otherwise we must create a new copy to modify: this is
|
1255 |
* "copy on write".
|
1256 |
*/
|
1257 |
|
1258 |
oldValuePtr = varPtr->value.objPtr;
|
1259 |
if (flags & TCL_APPEND_VALUE) {
|
1260 |
if (TclIsVarUndefined(varPtr) && (oldValuePtr != NULL)) {
|
1261 |
Tcl_DecrRefCount(oldValuePtr); /* discard old value */
|
1262 |
varPtr->value.objPtr = NULL;
|
1263 |
oldValuePtr = NULL;
|
1264 |
}
|
1265 |
if (flags & TCL_LIST_ELEMENT) { /* append list element */
|
1266 |
if (oldValuePtr == NULL) {
|
1267 |
TclNewObj(oldValuePtr);
|
1268 |
varPtr->value.objPtr = oldValuePtr;
|
1269 |
Tcl_IncrRefCount(oldValuePtr); /* since var is referenced */
|
1270 |
} else if (Tcl_IsShared(oldValuePtr)) {
|
1271 |
varPtr->value.objPtr = Tcl_DuplicateObj(oldValuePtr);
|
1272 |
Tcl_DecrRefCount(oldValuePtr);
|
1273 |
oldValuePtr = varPtr->value.objPtr;
|
1274 |
Tcl_IncrRefCount(oldValuePtr); /* since var is referenced */
|
1275 |
}
|
1276 |
result = Tcl_ListObjAppendElement(interp, oldValuePtr,
|
1277 |
newValuePtr);
|
1278 |
if (result != TCL_OK) {
|
1279 |
return NULL;
|
1280 |
}
|
1281 |
} else { /* append string */
|
1282 |
/*
|
1283 |
* We append newValuePtr's bytes but don't change its ref count.
|
1284 |
*/
|
1285 |
|
1286 |
bytes = Tcl_GetStringFromObj(newValuePtr, &length);
|
1287 |
if (oldValuePtr == NULL) {
|
1288 |
varPtr->value.objPtr = Tcl_NewStringObj(bytes, length);
|
1289 |
Tcl_IncrRefCount(varPtr->value.objPtr);
|
1290 |
} else {
|
1291 |
if (Tcl_IsShared(oldValuePtr)) { /* append to copy */
|
1292 |
varPtr->value.objPtr = Tcl_DuplicateObj(oldValuePtr);
|
1293 |
TclDecrRefCount(oldValuePtr);
|
1294 |
oldValuePtr = varPtr->value.objPtr;
|
1295 |
Tcl_IncrRefCount(oldValuePtr); /* since var is ref */
|
1296 |
}
|
1297 |
Tcl_AppendObjToObj(oldValuePtr, newValuePtr);
|
1298 |
}
|
1299 |
}
|
1300 |
} else {
|
1301 |
if (flags & TCL_LIST_ELEMENT) { /* set var to list element */
|
1302 |
int neededBytes, listFlags;
|
1303 |
|
1304 |
/*
|
1305 |
* We set the variable to the result of converting newValuePtr's
|
1306 |
* string rep to a list element. We do not change newValuePtr's
|
1307 |
* ref count.
|
1308 |
*/
|
1309 |
|
1310 |
if (oldValuePtr != NULL) {
|
1311 |
Tcl_DecrRefCount(oldValuePtr); /* discard old value */
|
1312 |
}
|
1313 |
bytes = Tcl_GetStringFromObj(newValuePtr, &length);
|
1314 |
neededBytes = Tcl_ScanElement(bytes, &listFlags);
|
1315 |
oldValuePtr = Tcl_NewObj();
|
1316 |
oldValuePtr->bytes = (char *)
|
1317 |
ckalloc((unsigned) (neededBytes + 1));
|
1318 |
oldValuePtr->length = Tcl_ConvertElement(bytes,
|
1319 |
oldValuePtr->bytes, listFlags);
|
1320 |
varPtr->value.objPtr = oldValuePtr;
|
1321 |
Tcl_IncrRefCount(varPtr->value.objPtr);
|
1322 |
} else if (newValuePtr != oldValuePtr) {
|
1323 |
varPtr->value.objPtr = newValuePtr;
|
1324 |
Tcl_IncrRefCount(newValuePtr); /* var is another ref */
|
1325 |
if (oldValuePtr != NULL) {
|
1326 |
TclDecrRefCount(oldValuePtr); /* discard old value */
|
1327 |
}
|
1328 |
}
|
1329 |
}
|
1330 |
TclSetVarScalar(varPtr);
|
1331 |
TclClearVarUndefined(varPtr);
|
1332 |
if (arrayPtr != NULL) {
|
1333 |
TclClearVarUndefined(arrayPtr);
|
1334 |
}
|
1335 |
|
1336 |
/*
|
1337 |
* Invoke any write traces for the variable.
|
1338 |
*/
|
1339 |
|
1340 |
if ((varPtr->tracePtr != NULL)
|
1341 |
|| ((arrayPtr != NULL) && (arrayPtr->tracePtr != NULL))) {
|
1342 |
char *msg = CallTraces(iPtr, arrayPtr, varPtr, part1, part2,
|
1343 |
(flags & (TCL_GLOBAL_ONLY|TCL_NAMESPACE_ONLY)) | TCL_TRACE_WRITES);
|
1344 |
if (msg != NULL) {
|
1345 |
if (flags & TCL_LEAVE_ERR_MSG) {
|
1346 |
VarErrMsg(interp, part1, part2, "set", msg);
|
1347 |
}
|
1348 |
goto cleanup;
|
1349 |
}
|
1350 |
}
|
1351 |
|
1352 |
/*
|
1353 |
* Return the variable's value unless the variable was changed in some
|
1354 |
* gross way by a trace (e.g. it was unset and then recreated as an
|
1355 |
* array).
|
1356 |
*/
|
1357 |
|
1358 |
if (TclIsVarScalar(varPtr) && !TclIsVarUndefined(varPtr)) {
|
1359 |
return varPtr->value.objPtr;
|
1360 |
}
|
1361 |
|
1362 |
/*
|
1363 |
* A trace changed the value in some gross way. Return an empty string
|
1364 |
* object.
|
1365 |
*/
|
1366 |
|
1367 |
resultPtr = iPtr->emptyObjPtr;
|
1368 |
|
1369 |
/*
|
1370 |
* If the variable doesn't exist anymore and no-one's using it, then
|
1371 |
* free up the relevant structures and hash table entries.
|
1372 |
*/
|
1373 |
|
1374 |
cleanup:
|
1375 |
if (TclIsVarUndefined(varPtr)) {
|
1376 |
CleanupVar(varPtr, arrayPtr);
|
1377 |
}
|
1378 |
return resultPtr;
|
1379 |
}
|
1380 |
|
1381 |
/*
|
1382 |
*----------------------------------------------------------------------
|
1383 |
*
|
1384 |
* TclSetIndexedScalar --
|
1385 |
*
|
1386 |
* Change the Tcl object value of a local scalar variable in the active
|
1387 |
* procedure, given its compile-time allocated index in the procedure's
|
1388 |
* array of local variables.
|
1389 |
*
|
1390 |
* Results:
|
1391 |
* Returns a pointer to the Tcl_Obj holding the new value of the
|
1392 |
* variable given by localIndex. If the specified variable doesn't
|
1393 |
* exist, or there is a clash in array usage, or an error occurs while
|
1394 |
* executing variable traces, then NULL is returned and a message will
|
1395 |
* be left in the interpreter's result if leaveErrorMsg is 1. Note
|
1396 |
* that the returned object may not be the same one referenced by
|
1397 |
* newValuePtr; this is because variable traces may modify the
|
1398 |
* variable's value.
|
1399 |
*
|
1400 |
* Side effects:
|
1401 |
* The value of the given variable is set. The reference count is
|
1402 |
* decremented for any old value of the variable and incremented for
|
1403 |
* its new value. If as a result of a variable trace the new value for
|
1404 |
* the variable is not the same one referenced by newValuePtr, then
|
1405 |
* newValuePtr's ref count is left unchanged. The ref count for the
|
1406 |
* returned object is _not_ incremented to reflect the returned
|
1407 |
* reference; if you want to keep a reference to the object you must
|
1408 |
* increment its ref count yourself. This procedure does not create
|
1409 |
* new variables, but only sets those recognized at compile time.
|
1410 |
*
|
1411 |
*----------------------------------------------------------------------
|
1412 |
*/
|
1413 |
|
1414 |
Tcl_Obj *
|
1415 |
TclSetIndexedScalar(interp, localIndex, newValuePtr, leaveErrorMsg)
|
1416 |
Tcl_Interp *interp; /* Command interpreter in which variable is
|
1417 |
* to be found. */
|
1418 |
int localIndex; /* Index of variable in procedure's array
|
1419 |
* of local variables. */
|
1420 |
Tcl_Obj *newValuePtr; /* New value for variable. */
|
1421 |
int leaveErrorMsg; /* 1 if to leave an error message in
|
1422 |
* the interpreter's result on an error.
|
1423 |
* Otherwise no error message is left. */
|
1424 |
{
|
1425 |
Interp *iPtr = (Interp *) interp;
|
1426 |
CallFrame *varFramePtr = iPtr->varFramePtr;
|
1427 |
/* Points to the procedure call frame whose
|
1428 |
* variables are currently in use. Same as
|
1429 |
* the current procedure's frame, if any,
|
1430 |
* unless an "uplevel" is executing. */
|
1431 |
Var *compiledLocals = varFramePtr->compiledLocals;
|
1432 |
register Var *varPtr; /* Points to the variable's in-frame Var
|
1433 |
* structure. */
|
1434 |
char *varName; /* Name of the local variable. */
|
1435 |
Tcl_Obj *oldValuePtr;
|
1436 |
Tcl_Obj *resultPtr = NULL;
|
1437 |
|
1438 |
#ifdef TCL_COMPILE_DEBUG
|
1439 |
Proc *procPtr = varFramePtr->procPtr;
|
1440 |
int localCt = procPtr->numCompiledLocals;
|
1441 |
|
1442 |
if (compiledLocals == NULL) {
|
1443 |
fprintf(stderr, "\nTclSetIndexedScalar: can't set local %i in frame 0x%x, no compiled locals\n",
|
1444 |
localIndex, (unsigned int) varFramePtr);
|
1445 |
panic("TclSetIndexedScalar: no compiled locals in frame 0x%x",
|
1446 |
(unsigned int) varFramePtr);
|
1447 |
}
|
1448 |
if ((localIndex < 0) || (localIndex >= localCt)) {
|
1449 |
fprintf(stderr, "\nTclSetIndexedScalar: can't set local %i in frame 0x%x with %i locals\n",
|
1450 |
localIndex, (unsigned int) varFramePtr, localCt);
|
1451 |
panic("TclSetIndexedScalar: bad local index %i in frame 0x%x",
|
1452 |
localIndex, (unsigned int) varFramePtr);
|
1453 |
}
|
1454 |
#endif /* TCL_COMPILE_DEBUG */
|
1455 |
|
1456 |
varPtr = &(compiledLocals[localIndex]);
|
1457 |
varName = varPtr->name;
|
1458 |
|
1459 |
/*
|
1460 |
* If varPtr is a link variable, we have a reference to some variable
|
1461 |
* that was created through an "upvar" or "global" command, or we have a
|
1462 |
* reference to a variable in an enclosing namespace. Traverse through
|
1463 |
* any links until we find the referenced variable.
|
1464 |
*/
|
1465 |
|
1466 |
while (TclIsVarLink(varPtr)) {
|
1467 |
varPtr = varPtr->value.linkPtr;
|
1468 |
}
|
1469 |
|
1470 |
/*
|
1471 |
* If the variable is in a hashtable and its hPtr field is NULL, then we
|
1472 |
* may have an upvar to an array element where the array was deleted
|
1473 |
* or an upvar to a namespace variable whose namespace was deleted.
|
1474 |
* Generate an error (allowing the variable to be reset would screw up
|
1475 |
* our storage allocation and is meaningless anyway).
|
1476 |
*/
|
1477 |
|
1478 |
if ((varPtr->flags & VAR_IN_HASHTABLE) && (varPtr->hPtr == NULL)) {
|
1479 |
if (leaveErrorMsg) {
|
1480 |
if (TclIsVarArrayElement(varPtr)) {
|
1481 |
VarErrMsg(interp, varName, NULL, "set", danglingElement);
|
1482 |
} else {
|
1483 |
VarErrMsg(interp, varName, NULL, "set", danglingVar);
|
1484 |
}
|
1485 |
}
|
1486 |
return NULL;
|
1487 |
}
|
1488 |
|
1489 |
/*
|
1490 |
* It's an error to try to set an array variable itself.
|
1491 |
*/
|
1492 |
|
1493 |
if (TclIsVarArray(varPtr) && !TclIsVarUndefined(varPtr)) {
|
1494 |
if (leaveErrorMsg) {
|
1495 |
VarErrMsg(interp, varName, NULL, "set", isArray);
|
1496 |
}
|
1497 |
return NULL;
|
1498 |
}
|
1499 |
|
1500 |
/*
|
1501 |
* Set the variable's new value and discard its old value. We don't
|
1502 |
* append with this "set" procedure so the old value isn't needed.
|
1503 |
*/
|
1504 |
|
1505 |
oldValuePtr = varPtr->value.objPtr;
|
1506 |
if (newValuePtr != oldValuePtr) { /* set new value */
|
1507 |
varPtr->value.objPtr = newValuePtr;
|
1508 |
Tcl_IncrRefCount(newValuePtr); /* var is another ref to obj */
|
1509 |
if (oldValuePtr != NULL) {
|
1510 |
TclDecrRefCount(oldValuePtr); /* discard old value */
|
1511 |
}
|
1512 |
}
|
1513 |
TclSetVarScalar(varPtr);
|
1514 |
TclClearVarUndefined(varPtr);
|
1515 |
|
1516 |
/*
|
1517 |
* Invoke any write traces for the variable.
|
1518 |
*/
|
1519 |
|
1520 |
if (varPtr->tracePtr != NULL) {
|
1521 |
char *msg = CallTraces(iPtr, /*arrayPtr*/ NULL, varPtr,
|
1522 |
varName, (char *) NULL, TCL_TRACE_WRITES);
|
1523 |
if (msg != NULL) {
|
1524 |
if (leaveErrorMsg) {
|
1525 |
VarErrMsg(interp, varName, NULL, "set", msg);
|
1526 |
}
|
1527 |
goto cleanup;
|
1528 |
}
|
1529 |
}
|
1530 |
|
1531 |
/*
|
1532 |
* Return the variable's value unless the variable was changed in some
|
1533 |
* gross way by a trace (e.g. it was unset and then recreated as an
|
1534 |
* array). If it was changed is a gross way, just return an empty string
|
1535 |
* object.
|
1536 |
*/
|
1537 |
|
1538 |
if (TclIsVarScalar(varPtr) && !TclIsVarUndefined(varPtr)) {
|
1539 |
return varPtr->value.objPtr;
|
1540 |
}
|
1541 |
|
1542 |
resultPtr = Tcl_NewObj();
|
1543 |
|
1544 |
/*
|
1545 |
* If the variable doesn't exist anymore and no-one's using it, then
|
1546 |
* free up the relevant structures and hash table entries.
|
1547 |
*/
|
1548 |
|
1549 |
cleanup:
|
1550 |
if (TclIsVarUndefined(varPtr)) {
|
1551 |
CleanupVar(varPtr, NULL);
|
1552 |
}
|
1553 |
return resultPtr;
|
1554 |
}
|
1555 |
|
1556 |
/*
|
1557 |
*----------------------------------------------------------------------
|
1558 |
*
|
1559 |
* TclSetElementOfIndexedArray --
|
1560 |
*
|
1561 |
* Change the Tcl object value of an element in a local array
|
1562 |
* variable. The element is named by the object elemPtr while the array
|
1563 |
* is specified by its index in the active procedure's array of
|
1564 |
* compiler allocated local variables.
|
1565 |
*
|
1566 |
* Results:
|
1567 |
* Returns a pointer to the Tcl_Obj holding the new value of the
|
1568 |
* element. If the specified array or element doesn't exist, or there
|
1569 |
* is a clash in array usage, or an error occurs while executing
|
1570 |
* variable traces, then NULL is returned and a message will be left in
|
1571 |
* the interpreter's result if leaveErrorMsg is 1. Note that the
|
1572 |
* returned object may not be the same one referenced by newValuePtr;
|
1573 |
* this is because variable traces may modify the variable's value.
|
1574 |
*
|
1575 |
* Side effects:
|
1576 |
* The value of the given array element is set. The reference count is
|
1577 |
* decremented for any old value of the element and incremented for its
|
1578 |
* new value. If as a result of a variable trace the new value for the
|
1579 |
* element is not the same one referenced by newValuePtr, then
|
1580 |
* newValuePtr's ref count is left unchanged. The ref count for the
|
1581 |
* returned object is _not_ incremented to reflect the returned
|
1582 |
* reference; if you want to keep a reference to the object you must
|
1583 |
* increment its ref count yourself. This procedure will not create new
|
1584 |
* array variables, but only sets elements of those arrays recognized
|
1585 |
* at compile time. However, if the entry doesn't exist then a new
|
1586 |
* variable is created.
|
1587 |
*
|
1588 |
*----------------------------------------------------------------------
|
1589 |
*/
|
1590 |
|
1591 |
Tcl_Obj *
|
1592 |
TclSetElementOfIndexedArray(interp, localIndex, elemPtr, newValuePtr,
|
1593 |
leaveErrorMsg)
|
1594 |
Tcl_Interp *interp; /* Command interpreter in which the array is
|
1595 |
* to be found. */
|
1596 |
int localIndex; /* Index of array variable in procedure's
|
1597 |
* array of local variables. */
|
1598 |
Tcl_Obj *elemPtr; /* Points to an object holding the name of
|
1599 |
* an element to set in the array. */
|
1600 |
Tcl_Obj *newValuePtr; /* New value for variable. */
|
1601 |
int leaveErrorMsg; /* 1 if to leave an error message in
|
1602 |
* the interpreter's result on an error.
|
1603 |
* Otherwise no error message is left. */
|
1604 |
{
|
1605 |
Interp *iPtr = (Interp *) interp;
|
1606 |
CallFrame *varFramePtr = iPtr->varFramePtr;
|
1607 |
/* Points to the procedure call frame whose
|
1608 |
* variables are currently in use. Same as
|
1609 |
* the current procedure's frame, if any,
|
1610 |
* unless an "uplevel" is executing. */
|
1611 |
Var *compiledLocals = varFramePtr->compiledLocals;
|
1612 |
Var *arrayPtr; /* Points to the array's in-frame Var
|
1613 |
* structure. */
|
1614 |
char *arrayName; /* Name of the local array. */
|
1615 |
char *elem;
|
1616 |
Tcl_HashEntry *hPtr;
|
1617 |
Var *varPtr = NULL; /* Points to the element's Var structure
|
1618 |
* that we return. */
|
1619 |
Tcl_Obj *resultPtr = NULL;
|
1620 |
Tcl_Obj *oldValuePtr;
|
1621 |
int new;
|
1622 |
|
1623 |
#ifdef TCL_COMPILE_DEBUG
|
1624 |
Proc *procPtr = varFramePtr->procPtr;
|
1625 |
int localCt = procPtr->numCompiledLocals;
|
1626 |
|
1627 |
if (compiledLocals == NULL) {
|
1628 |
fprintf(stderr, "\nTclSetElementOfIndexedArray: can't set element of local %i in frame 0x%x, no compiled locals\n",
|
1629 |
localIndex, (unsigned int) varFramePtr);
|
1630 |
panic("TclSetIndexedScalar: no compiled locals in frame 0x%x",
|
1631 |
(unsigned int) varFramePtr);
|
1632 |
}
|
1633 |
if ((localIndex < 0) || (localIndex >= localCt)) {
|
1634 |
fprintf(stderr, "\nTclSetIndexedScalar: can't set elememt of local %i in frame 0x%x with %i locals\n",
|
1635 |
localIndex, (unsigned int) varFramePtr, localCt);
|
1636 |
panic("TclSetElementOfIndexedArray: bad local index %i in frame 0x%x",
|
1637 |
localIndex, (unsigned int) varFramePtr);
|
1638 |
}
|
1639 |
#endif /* TCL_COMPILE_DEBUG */
|
1640 |
|
1641 |
elem = TclGetString(elemPtr);
|
1642 |
arrayPtr = &(compiledLocals[localIndex]);
|
1643 |
arrayName = arrayPtr->name;
|
1644 |
|
1645 |
/*
|
1646 |
* If arrayPtr is a link variable, we have a reference to some variable
|
1647 |
* that was created through an "upvar" or "global" command, or we have a
|
1648 |
* reference to a variable in an enclosing namespace. Traverse through
|
1649 |
* any links until we find the referenced variable.
|
1650 |
*/
|
1651 |
|
1652 |
while (TclIsVarLink(arrayPtr)) {
|
1653 |
arrayPtr = arrayPtr->value.linkPtr;
|
1654 |
}
|
1655 |
|
1656 |
/*
|
1657 |
* If the variable is in a hashtable and its hPtr field is NULL, then we
|
1658 |
* may have an upvar to an array element where the array was deleted
|
1659 |
* or an upvar to a namespace variable whose namespace was deleted.
|
1660 |
* Generate an error (allowing the variable to be reset would screw up
|
1661 |
* our storage allocation and is meaningless anyway).
|
1662 |
*/
|
1663 |
|
1664 |
if ((arrayPtr->flags & VAR_IN_HASHTABLE) && (arrayPtr->hPtr == NULL)) {
|
1665 |
if (leaveErrorMsg) {
|
1666 |
if (TclIsVarArrayElement(arrayPtr)) {
|
1667 |
VarErrMsg(interp, arrayName, elem, "set", danglingElement);
|
1668 |
} else {
|
1669 |
VarErrMsg(interp, arrayName, elem, "set", danglingVar);
|
1670 |
}
|
1671 |
}
|
1672 |
goto errorReturn;
|
1673 |
}
|
1674 |
|
1675 |
/*
|
1676 |
* Make sure we're dealing with an array.
|
1677 |
*/
|
1678 |
|
1679 |
if (TclIsVarUndefined(arrayPtr) && !TclIsVarArrayElement(arrayPtr)) {
|
1680 |
TclSetVarArray(arrayPtr);
|
1681 |
arrayPtr->value.tablePtr =
|
1682 |
(Tcl_HashTable *) ckalloc(sizeof(Tcl_HashTable));
|
1683 |
Tcl_InitHashTable(arrayPtr->value.tablePtr, TCL_STRING_KEYS);
|
1684 |
TclClearVarUndefined(arrayPtr);
|
1685 |
} else if (!TclIsVarArray(arrayPtr)) {
|
1686 |
if (leaveErrorMsg) {
|
1687 |
VarErrMsg(interp, arrayName, elem, "set", needArray);
|
1688 |
}
|
1689 |
goto errorReturn;
|
1690 |
}
|
1691 |
|
1692 |
/*
|
1693 |
* Look up the element.
|
1694 |
*/
|
1695 |
|
1696 |
hPtr = Tcl_CreateHashEntry(arrayPtr->value.tablePtr, elem, &new);
|
1697 |
if (new) {
|
1698 |
if (arrayPtr->searchPtr != NULL) {
|
1699 |
DeleteSearches(arrayPtr);
|
1700 |
}
|
1701 |
varPtr = NewVar();
|
1702 |
Tcl_SetHashValue(hPtr, varPtr);
|
1703 |
varPtr->hPtr = hPtr;
|
1704 |
varPtr->nsPtr = varFramePtr->nsPtr;
|
1705 |
TclSetVarArrayElement(varPtr);
|
1706 |
}
|
1707 |
varPtr = (Var *) Tcl_GetHashValue(hPtr);
|
1708 |
|
1709 |
/*
|
1710 |
* It's an error to try to set an array variable itself.
|
1711 |
*/
|
1712 |
|
1713 |
if (TclIsVarArray(varPtr)) {
|
1714 |
if (leaveErrorMsg) {
|
1715 |
VarErrMsg(interp, arrayName, elem, "set", isArray);
|
1716 |
}
|
1717 |
goto errorReturn;
|
1718 |
}
|
1719 |
|
1720 |
/*
|
1721 |
* Set the variable's new value and discard the old one. We don't
|
1722 |
* append with this "set" procedure so the old value isn't needed.
|
1723 |
*/
|
1724 |
|
1725 |
oldValuePtr = varPtr->value.objPtr;
|
1726 |
if (newValuePtr != oldValuePtr) { /* set new value */
|
1727 |
varPtr->value.objPtr = newValuePtr;
|
1728 |
Tcl_IncrRefCount(newValuePtr); /* var is another ref to obj */
|
1729 |
if (oldValuePtr != NULL) {
|
1730 |
TclDecrRefCount(oldValuePtr); /* discard old value */
|
1731 |
}
|
1732 |
}
|
1733 |
TclSetVarScalar(varPtr);
|
1734 |
TclClearVarUndefined(varPtr);
|
1735 |
|
1736 |
/*
|
1737 |
* Invoke any write traces for the element variable.
|
1738 |
*/
|
1739 |
|
1740 |
if ((varPtr->tracePtr != NULL)
|
1741 |
|| ((arrayPtr != NULL) && (arrayPtr->tracePtr != NULL))) {
|
1742 |
char *msg = CallTraces(iPtr, arrayPtr, varPtr, arrayName, elem,
|
1743 |
TCL_TRACE_WRITES);
|
1744 |
if (msg != NULL) {
|
1745 |
if (leaveErrorMsg) {
|
1746 |
VarErrMsg(interp, arrayName, elem, "set", msg);
|
1747 |
}
|
1748 |
goto errorReturn;
|
1749 |
}
|
1750 |
}
|
1751 |
|
1752 |
/*
|
1753 |
* Return the element's value unless it was changed in some gross way by
|
1754 |
* a trace (e.g. it was unset and then recreated as an array). If it was
|
1755 |
* changed is a gross way, just return an empty string object.
|
1756 |
*/
|
1757 |
|
1758 |
if (TclIsVarScalar(varPtr) && !TclIsVarUndefined(varPtr)) {
|
1759 |
return varPtr->value.objPtr;
|
1760 |
}
|
1761 |
|
1762 |
resultPtr = Tcl_NewObj();
|
1763 |
|
1764 |
/*
|
1765 |
* An error. If the variable doesn't exist anymore and no-one's using
|
1766 |
* it, then free up the relevant structures and hash table entries.
|
1767 |
*/
|
1768 |
|
1769 |
errorReturn:
|
1770 |
if (varPtr != NULL) {
|
1771 |
if (TclIsVarUndefined(varPtr)) {
|
1772 |
CleanupVar(varPtr, NULL); /* note: array isn't in hashtable */
|
1773 |
}
|
1774 |
}
|
1775 |
return resultPtr;
|
1776 |
}
|
1777 |
|
1778 |
/*
|
1779 |
*----------------------------------------------------------------------
|
1780 |
*
|
1781 |
* TclIncrVar2 --
|
1782 |
*
|
1783 |
* Given a two-part variable name, which may refer either to a scalar
|
1784 |
* variable or an element of an array, increment the Tcl object value
|
1785 |
* of the variable by a specified amount.
|
1786 |
*
|
1787 |
* Results:
|
1788 |
* Returns a pointer to the Tcl_Obj holding the new value of the
|
1789 |
* variable. If the specified variable doesn't exist, or there is a
|
1790 |
* clash in array usage, or an error occurs while executing variable
|
1791 |
* traces, then NULL is returned and a message will be left in
|
1792 |
* the interpreter's result.
|
1793 |
*
|
1794 |
* Side effects:
|
1795 |
* The value of the given variable is incremented by the specified
|
1796 |
* amount. If either the array or the entry didn't exist then a new
|
1797 |
* variable is created. The ref count for the returned object is _not_
|
1798 |
* incremented to reflect the returned reference; if you want to keep a
|
1799 |
* reference to the object you must increment its ref count yourself.
|
1800 |
*
|
1801 |
*----------------------------------------------------------------------
|
1802 |
*/
|
1803 |
|
1804 |
Tcl_Obj *
|
1805 |
TclIncrVar2(interp, part1Ptr, part2Ptr, incrAmount, flags)
|
1806 |
Tcl_Interp *interp; /* Command interpreter in which variable is
|
1807 |
* to be found. */
|
1808 |
Tcl_Obj *part1Ptr; /* Points to an object holding the name of
|
1809 |
* an array (if part2 is non-NULL) or the
|
1810 |
* name of a variable. */
|
1811 |
Tcl_Obj *part2Ptr; /* If non-null, points to an object holding
|
1812 |
* the name of an element in the array
|
1813 |
* part1Ptr. */
|
1814 |
long incrAmount; /* Amount to be added to variable. */
|
1815 |
int flags; /* Various flags that tell how to incr value:
|
1816 |
* any of TCL_GLOBAL_ONLY,
|
1817 |
* TCL_NAMESPACE_ONLY, TCL_APPEND_VALUE,
|
1818 |
* TCL_LIST_ELEMENT, TCL_LEAVE_ERR_MSG. */
|
1819 |
{
|
1820 |
register Tcl_Obj *varValuePtr;
|
1821 |
Tcl_Obj *resultPtr;
|
1822 |
int createdNewObj; /* Set 1 if var's value object is shared
|
1823 |
* so we must increment a copy (i.e. copy
|
1824 |
* on write). */
|
1825 |
long i;
|
1826 |
int result;
|
1827 |
|
1828 |
varValuePtr = Tcl_ObjGetVar2(interp, part1Ptr, part2Ptr, flags);
|
1829 |
if (varValuePtr == NULL) {
|
1830 |
Tcl_AddObjErrorInfo(interp,
|
1831 |
"\n (reading value of variable to increment)", -1);
|
1832 |
return NULL;
|
1833 |
}
|
1834 |
|
1835 |
/*
|
1836 |
* Increment the variable's value. If the object is unshared we can
|
1837 |
* modify it directly, otherwise we must create a new copy to modify:
|
1838 |
* this is "copy on write". Then free the variable's old string
|
1839 |
* representation, if any, since it will no longer be valid.
|
1840 |
*/
|
1841 |
|
1842 |
createdNewObj = 0;
|
1843 |
if (Tcl_IsShared(varValuePtr)) {
|
1844 |
varValuePtr = Tcl_DuplicateObj(varValuePtr);
|
1845 |
createdNewObj = 1;
|
1846 |
}
|
1847 |
result = Tcl_GetLongFromObj(interp, varValuePtr, &i);
|
1848 |
if (result != TCL_OK) {
|
1849 |
if (createdNewObj) {
|
1850 |
Tcl_DecrRefCount(varValuePtr); /* free unneeded copy */
|
1851 |
}
|
1852 |
return NULL;
|
1853 |
}
|
1854 |
Tcl_SetLongObj(varValuePtr, (i + incrAmount));
|
1855 |
|
1856 |
/*
|
1857 |
* Store the variable's new value and run any write traces.
|
1858 |
*/
|
1859 |
|
1860 |
resultPtr = Tcl_ObjSetVar2(interp, part1Ptr, part2Ptr, varValuePtr, flags);
|
1861 |
if (resultPtr == NULL) {
|
1862 |
return NULL;
|
1863 |
}
|
1864 |
return resultPtr;
|
1865 |
}
|
1866 |
|
1867 |
/*
|
1868 |
*----------------------------------------------------------------------
|
1869 |
*
|
1870 |
* TclIncrIndexedScalar --
|
1871 |
*
|
1872 |
* Increments the Tcl object value of a local scalar variable in the
|
1873 |
* active procedure, given its compile-time allocated index in the
|
1874 |
* procedure's array of local variables.
|
1875 |
*
|
1876 |
* Results:
|
1877 |
* Returns a pointer to the Tcl_Obj holding the new value of the
|
1878 |
* variable given by localIndex. If the specified variable doesn't
|
1879 |
* exist, or there is a clash in array usage, or an error occurs while
|
1880 |
* executing variable traces, then NULL is returned and a message will
|
1881 |
* be left in the interpreter's result.
|
1882 |
*
|
1883 |
* Side effects:
|
1884 |
* The value of the given variable is incremented by the specified
|
1885 |
* amount. The ref count for the returned object is _not_ incremented
|
1886 |
* to reflect the returned reference; if you want to keep a reference
|
1887 |
* to the object you must increment its ref count yourself.
|
1888 |
*
|
1889 |
*----------------------------------------------------------------------
|
1890 |
*/
|
1891 |
|
1892 |
Tcl_Obj *
|
1893 |
TclIncrIndexedScalar(interp, localIndex, incrAmount)
|
1894 |
Tcl_Interp *interp; /* Command interpreter in which variable is
|
1895 |
* to be found. */
|
1896 |
int localIndex; /* Index of variable in procedure's array
|
1897 |
* of local variables. */
|
1898 |
long incrAmount; /* Amount to be added to variable. */
|
1899 |
{
|
1900 |
register Tcl_Obj *varValuePtr;
|
1901 |
Tcl_Obj *resultPtr;
|
1902 |
int createdNewObj; /* Set 1 if var's value object is shared
|
1903 |
* so we must increment a copy (i.e. copy
|
1904 |
* on write). */
|
1905 |
long i;
|
1906 |
int result;
|
1907 |
|
1908 |
varValuePtr = TclGetIndexedScalar(interp, localIndex,
|
1909 |
/*leaveErrorMsg*/ 1);
|
1910 |
if (varValuePtr == NULL) {
|
1911 |
Tcl_AddObjErrorInfo(interp,
|
1912 |
"\n (reading value of variable to increment)", -1);
|
1913 |
return NULL;
|
1914 |
}
|
1915 |
|
1916 |
/*
|
1917 |
* Reach into the object's representation to extract and increment the
|
1918 |
* variable's value. If the object is unshared we can modify it
|
1919 |
* directly, otherwise we must create a new copy to modify: this is
|
1920 |
* "copy on write". Then free the variable's old string representation,
|
1921 |
* if any, since it will no longer be valid.
|
1922 |
*/
|
1923 |
|
1924 |
createdNewObj = 0;
|
1925 |
if (Tcl_IsShared(varValuePtr)) {
|
1926 |
createdNewObj = 1;
|
1927 |
varValuePtr = Tcl_DuplicateObj(varValuePtr);
|
1928 |
}
|
1929 |
result = Tcl_GetLongFromObj(interp, varValuePtr, &i);
|
1930 |
if (result != TCL_OK) {
|
1931 |
if (createdNewObj) {
|
1932 |
Tcl_DecrRefCount(varValuePtr); /* free unneeded copy */
|
1933 |
}
|
1934 |
return NULL;
|
1935 |
}
|
1936 |
Tcl_SetLongObj(varValuePtr, (i + incrAmount));
|
1937 |
|
1938 |
/*
|
1939 |
* Store the variable's new value and run any write traces.
|
1940 |
*/
|
1941 |
|
1942 |
resultPtr = TclSetIndexedScalar(interp, localIndex, varValuePtr,
|
1943 |
/*leaveErrorMsg*/ 1);
|
1944 |
if (resultPtr == NULL) {
|
1945 |
return NULL;
|
1946 |
}
|
1947 |
return resultPtr;
|
1948 |
}
|
1949 |
|
1950 |
/*
|
1951 |
*----------------------------------------------------------------------
|
1952 |
*
|
1953 |
* TclIncrElementOfIndexedArray --
|
1954 |
*
|
1955 |
* Increments the Tcl object value of an element in a local array
|
1956 |
* variable. The element is named by the object elemPtr while the array
|
1957 |
* is specified by its index in the active procedure's array of
|
1958 |
* compiler allocated local variables.
|
1959 |
*
|
1960 |
* Results:
|
1961 |
* Returns a pointer to the Tcl_Obj holding the new value of the
|
1962 |
* element. If the specified array or element doesn't exist, or there
|
1963 |
* is a clash in array usage, or an error occurs while executing
|
1964 |
* variable traces, then NULL is returned and a message will be left in
|
1965 |
* the interpreter's result.
|
1966 |
*
|
1967 |
* Side effects:
|
1968 |
* The value of the given array element is incremented by the specified
|
1969 |
* amount. The ref count for the returned object is _not_ incremented
|
1970 |
* to reflect the returned reference; if you want to keep a reference
|
1971 |
* to the object you must increment its ref count yourself. If the
|
1972 |
* entry doesn't exist then a new variable is created.
|
1973 |
*
|
1974 |
*----------------------------------------------------------------------
|
1975 |
*/
|
1976 |
|
1977 |
Tcl_Obj *
|
1978 |
TclIncrElementOfIndexedArray(interp, localIndex, elemPtr, incrAmount)
|
1979 |
Tcl_Interp *interp; /* Command interpreter in which the array is
|
1980 |
* to be found. */
|
1981 |
int localIndex; /* Index of array variable in procedure's
|
1982 |
* array of local variables. */
|
1983 |
Tcl_Obj *elemPtr; /* Points to an object holding the name of
|
1984 |
* an element to increment in the array. */
|
1985 |
long incrAmount; /* Amount to be added to variable. */
|
1986 |
{
|
1987 |
register Tcl_Obj *varValuePtr;
|
1988 |
Tcl_Obj *resultPtr;
|
1989 |
int createdNewObj; /* Set 1 if var's value object is shared
|
1990 |
* so we must increment a copy (i.e. copy
|
1991 |
* on write). */
|
1992 |
long i;
|
1993 |
int result;
|
1994 |
|
1995 |
varValuePtr = TclGetElementOfIndexedArray(interp, localIndex, elemPtr,
|
1996 |
/*leaveErrorMsg*/ 1);
|
1997 |
if (varValuePtr == NULL) {
|
1998 |
Tcl_AddObjErrorInfo(interp,
|
1999 |
"\n (reading value of variable to increment)", -1);
|
2000 |
return NULL;
|
2001 |
}
|
2002 |
|
2003 |
/*
|
2004 |
* Reach into the object's representation to extract and increment the
|
2005 |
* variable's value. If the object is unshared we can modify it
|
2006 |
* directly, otherwise we must create a new copy to modify: this is
|
2007 |
* "copy on write". Then free the variable's old string representation,
|
2008 |
* if any, since it will no longer be valid.
|
2009 |
*/
|
2010 |
|
2011 |
createdNewObj = 0;
|
2012 |
if (Tcl_IsShared(varValuePtr)) {
|
2013 |
createdNewObj = 1;
|
2014 |
varValuePtr = Tcl_DuplicateObj(varValuePtr);
|
2015 |
}
|
2016 |
result = Tcl_GetLongFromObj(interp, varValuePtr, &i);
|
2017 |
if (result != TCL_OK) {
|
2018 |
if (createdNewObj) {
|
2019 |
Tcl_DecrRefCount(varValuePtr); /* free unneeded copy */
|
2020 |
}
|
2021 |
return NULL;
|
2022 |
}
|
2023 |
Tcl_SetLongObj(varValuePtr, (i + incrAmount));
|
2024 |
|
2025 |
/*
|
2026 |
* Store the variable's new value and run any write traces.
|
2027 |
*/
|
2028 |
|
2029 |
resultPtr = TclSetElementOfIndexedArray(interp, localIndex, elemPtr,
|
2030 |
varValuePtr,
|
2031 |
/*leaveErrorMsg*/ 1);
|
2032 |
if (resultPtr == NULL) {
|
2033 |
return NULL;
|
2034 |
}
|
2035 |
return resultPtr;
|
2036 |
}
|
2037 |
|
2038 |
/*
|
2039 |
*----------------------------------------------------------------------
|
2040 |
*
|
2041 |
* Tcl_UnsetVar --
|
2042 |
*
|
2043 |
* Delete a variable, so that it may not be accessed anymore.
|
2044 |
*
|
2045 |
* Results:
|
2046 |
* Returns TCL_OK if the variable was successfully deleted, TCL_ERROR
|
2047 |
* if the variable can't be unset. In the event of an error,
|
2048 |
* if the TCL_LEAVE_ERR_MSG flag is set then an error message
|
2049 |
* is left in the interp's result.
|
2050 |
*
|
2051 |
* Side effects:
|
2052 |
* If varName is defined as a local or global variable in interp,
|
2053 |
* it is deleted.
|
2054 |
*
|
2055 |
*----------------------------------------------------------------------
|
2056 |
*/
|
2057 |
|
2058 |
int
|
2059 |
Tcl_UnsetVar(interp, varName, flags)
|
2060 |
Tcl_Interp *interp; /* Command interpreter in which varName is
|
2061 |
* to be looked up. */
|
2062 |
char *varName; /* Name of a variable in interp. May be
|
2063 |
* either a scalar name or an array name
|
2064 |
* or an element in an array. */
|
2065 |
int flags; /* OR-ed combination of any of
|
2066 |
* TCL_GLOBAL_ONLY, TCL_NAMESPACE_ONLY or
|
2067 |
* TCL_LEAVE_ERR_MSG. */
|
2068 |
{
|
2069 |
return Tcl_UnsetVar2(interp, varName, (char *) NULL, flags);
|
2070 |
}
|
2071 |
|
2072 |
/*
|
2073 |
*----------------------------------------------------------------------
|
2074 |
*
|
2075 |
* Tcl_UnsetVar2 --
|
2076 |
*
|
2077 |
* Delete a variable, given a 2-part name.
|
2078 |
*
|
2079 |
* Results:
|
2080 |
* Returns TCL_OK if the variable was successfully deleted, TCL_ERROR
|
2081 |
* if the variable can't be unset. In the event of an error,
|
2082 |
* if the TCL_LEAVE_ERR_MSG flag is set then an error message
|
2083 |
* is left in the interp's result.
|
2084 |
*
|
2085 |
* Side effects:
|
2086 |
* If part1 and part2 indicate a local or global variable in interp,
|
2087 |
* it is deleted. If part1 is an array name and part2 is NULL, then
|
2088 |
* the whole array is deleted.
|
2089 |
*
|
2090 |
*----------------------------------------------------------------------
|
2091 |
*/
|
2092 |
|
2093 |
int
|
2094 |
Tcl_UnsetVar2(interp, part1, part2, flags)
|
2095 |
Tcl_Interp *interp; /* Command interpreter in which varName is
|
2096 |
* to be looked up. */
|
2097 |
char *part1; /* Name of variable or array. */
|
2098 |
char *part2; /* Name of element within array or NULL. */
|
2099 |
int flags; /* OR-ed combination of any of
|
2100 |
* TCL_GLOBAL_ONLY, TCL_NAMESPACE_ONLY,
|
2101 |
* TCL_LEAVE_ERR_MSG. */
|
2102 |
{
|
2103 |
Var dummyVar;
|
2104 |
Var *varPtr, *dummyVarPtr;
|
2105 |
Interp *iPtr = (Interp *) interp;
|
2106 |
Var *arrayPtr;
|
2107 |
ActiveVarTrace *activePtr;
|
2108 |
Tcl_Obj *objPtr;
|
2109 |
int result;
|
2110 |
|
2111 |
varPtr = TclLookupVar(interp, part1, part2, flags, "unset",
|
2112 |
/*createPart1*/ 0, /*createPart2*/ 0, &arrayPtr);
|
2113 |
if (varPtr == NULL) {
|
2114 |
return TCL_ERROR;
|
2115 |
}
|
2116 |
result = (TclIsVarUndefined(varPtr)? TCL_ERROR : TCL_OK);
|
2117 |
|
2118 |
if ((arrayPtr != NULL) && (arrayPtr->searchPtr != NULL)) {
|
2119 |
DeleteSearches(arrayPtr);
|
2120 |
}
|
2121 |
|
2122 |
/*
|
2123 |
* The code below is tricky, because of the possibility that
|
2124 |
* a trace procedure might try to access a variable being
|
2125 |
* deleted. To handle this situation gracefully, do things
|
2126 |
* in three steps:
|
2127 |
* 1. Copy the contents of the variable to a dummy variable
|
2128 |
* structure, and mark the original Var structure as undefined.
|
2129 |
* 2. Invoke traces and clean up the variable, using the dummy copy.
|
2130 |
* 3. If at the end of this the original variable is still
|
2131 |
* undefined and has no outstanding references, then delete
|
2132 |
* it (but it could have gotten recreated by a trace).
|
2133 |
*/
|
2134 |
|
2135 |
dummyVar = *varPtr;
|
2136 |
TclSetVarUndefined(varPtr);
|
2137 |
TclSetVarScalar(varPtr);
|
2138 |
varPtr->value.objPtr = NULL; /* dummyVar points to any value object */
|
2139 |
varPtr->tracePtr = NULL;
|
2140 |
varPtr->searchPtr = NULL;
|
2141 |
|
2142 |
/*
|
2143 |
* Call trace procedures for the variable being deleted. Then delete
|
2144 |
* its traces. Be sure to abort any other traces for the variable
|
2145 |
* that are still pending. Special tricks:
|
2146 |
* 1. We need to increment varPtr's refCount around this: CallTraces
|
2147 |
* will use dummyVar so it won't increment varPtr's refCount itself.
|
2148 |
* 2. Turn off the VAR_TRACE_ACTIVE flag in dummyVar: we want to
|
2149 |
* call unset traces even if other traces are pending.
|
2150 |
*/
|
2151 |
|
2152 |
if ((dummyVar.tracePtr != NULL)
|
2153 |
|| ((arrayPtr != NULL) && (arrayPtr->tracePtr != NULL))) {
|
2154 |
varPtr->refCount++;
|
2155 |
dummyVar.flags &= ~VAR_TRACE_ACTIVE;
|
2156 |
(void) CallTraces(iPtr, arrayPtr, &dummyVar, part1, part2,
|
2157 |
(flags & (TCL_GLOBAL_ONLY|TCL_NAMESPACE_ONLY)) | TCL_TRACE_UNSETS);
|
2158 |
while (dummyVar.tracePtr != NULL) {
|
2159 |
VarTrace *tracePtr = dummyVar.tracePtr;
|
2160 |
dummyVar.tracePtr = tracePtr->nextPtr;
|
2161 |
ckfree((char *) tracePtr);
|
2162 |
}
|
2163 |
for (activePtr = iPtr->activeTracePtr; activePtr != NULL;
|
2164 |
activePtr = activePtr->nextPtr) {
|
2165 |
if (activePtr->varPtr == varPtr) {
|
2166 |
activePtr->nextTracePtr = NULL;
|
2167 |
}
|
2168 |
}
|
2169 |
varPtr->refCount--;
|
2170 |
}
|
2171 |
|
2172 |
/*
|
2173 |
* If the variable is an array, delete all of its elements. This must be
|
2174 |
* done after calling the traces on the array, above (that's the way
|
2175 |
* traces are defined). If it is a scalar, "discard" its object
|
2176 |
* (decrement the ref count of its object, if any).
|
2177 |
*/
|
2178 |
|
2179 |
dummyVarPtr = &dummyVar;
|
2180 |
if (TclIsVarArray(dummyVarPtr) && !TclIsVarUndefined(dummyVarPtr)) {
|
2181 |
/*
|
2182 |
* Deleting the elements of the array may cause traces to be fired
|
2183 |
* on those elements. Before deleting them, bump the reference count
|
2184 |
* of the array, so that if those trace procs make a global or upvar
|
2185 |
* link to the array, the array is not deleted when the call stack
|
2186 |
* gets popped (we will delete the array ourselves later in this
|
2187 |
* function).
|
2188 |
*
|
2189 |
* Bumping the count can lead to the odd situation that elements of the
|
2190 |
* array are being deleted when the array still exists, but since the
|
2191 |
* array is about to be removed anyway, that shouldn't really matter.
|
2192 |
*/
|
2193 |
varPtr->refCount++;
|
2194 |
DeleteArray(iPtr, part1, dummyVarPtr,
|
2195 |
(flags & (TCL_GLOBAL_ONLY|TCL_NAMESPACE_ONLY)) | TCL_TRACE_UNSETS);
|
2196 |
/* Decr ref count */
|
2197 |
varPtr->refCount--;
|
2198 |
}
|
2199 |
if (TclIsVarScalar(dummyVarPtr)
|
2200 |
&& (dummyVarPtr->value.objPtr != NULL)) {
|
2201 |
objPtr = dummyVarPtr->value.objPtr;
|
2202 |
TclDecrRefCount(objPtr);
|
2203 |
dummyVarPtr->value.objPtr = NULL;
|
2204 |
}
|
2205 |
|
2206 |
/*
|
2207 |
* If the variable was a namespace variable, decrement its reference count.
|
2208 |
*/
|
2209 |
|
2210 |
if (varPtr->flags & VAR_NAMESPACE_VAR) {
|
2211 |
varPtr->flags &= ~VAR_NAMESPACE_VAR;
|
2212 |
varPtr->refCount--;
|
2213 |
}
|
2214 |
|
2215 |
/*
|
2216 |
* It's an error to unset an undefined variable.
|
2217 |
*/
|
2218 |
|
2219 |
if (result != TCL_OK) {
|
2220 |
if (flags & TCL_LEAVE_ERR_MSG) {
|
2221 |
VarErrMsg(interp, part1, part2, "unset",
|
2222 |
((arrayPtr == NULL) ? noSuchVar : noSuchElement));
|
2223 |
}
|
2224 |
}
|
2225 |
|
2226 |
/*
|
2227 |
* Finally, if the variable is truly not in use then free up its Var
|
2228 |
* structure and remove it from its hash table, if any. The ref count of
|
2229 |
* its value object, if any, was decremented above.
|
2230 |
*/
|
2231 |
|
2232 |
CleanupVar(varPtr, arrayPtr);
|
2233 |
return result;
|
2234 |
}
|
2235 |
|
2236 |
/*
|
2237 |
*----------------------------------------------------------------------
|
2238 |
*
|
2239 |
* Tcl_TraceVar --
|
2240 |
*
|
2241 |
* Arrange for reads and/or writes to a variable to cause a
|
2242 |
* procedure to be invoked, which can monitor the operations
|
2243 |
* and/or change their actions.
|
2244 |
*
|
2245 |
* Results:
|
2246 |
* A standard Tcl return value.
|
2247 |
*
|
2248 |
* Side effects:
|
2249 |
* A trace is set up on the variable given by varName, such that
|
2250 |
* future references to the variable will be intermediated by
|
2251 |
* proc. See the manual entry for complete details on the calling
|
2252 |
* sequence for proc.
|
2253 |
*
|
2254 |
*----------------------------------------------------------------------
|
2255 |
*/
|
2256 |
|
2257 |
int
|
2258 |
Tcl_TraceVar(interp, varName, flags, proc, clientData)
|
2259 |
Tcl_Interp *interp; /* Interpreter in which variable is
|
2260 |
* to be traced. */
|
2261 |
char *varName; /* Name of variable; may end with "(index)"
|
2262 |
* to signify an array reference. */
|
2263 |
int flags; /* OR-ed collection of bits, including any
|
2264 |
* of TCL_TRACE_READS, TCL_TRACE_WRITES,
|
2265 |
* TCL_TRACE_UNSETS, TCL_GLOBAL_ONLY, and
|
2266 |
* TCL_NAMESPACE_ONLY. */
|
2267 |
Tcl_VarTraceProc *proc; /* Procedure to call when specified ops are
|
2268 |
* invoked upon varName. */
|
2269 |
ClientData clientData; /* Arbitrary argument to pass to proc. */
|
2270 |
{
|
2271 |
return Tcl_TraceVar2(interp, varName, (char *) NULL,
|
2272 |
flags, proc, clientData);
|
2273 |
}
|
2274 |
|
2275 |
/*
|
2276 |
*----------------------------------------------------------------------
|
2277 |
*
|
2278 |
* Tcl_TraceVar2 --
|
2279 |
*
|
2280 |
* Arrange for reads and/or writes to a variable to cause a
|
2281 |
* procedure to be invoked, which can monitor the operations
|
2282 |
* and/or change their actions.
|
2283 |
*
|
2284 |
* Results:
|
2285 |
* A standard Tcl return value.
|
2286 |
*
|
2287 |
* Side effects:
|
2288 |
* A trace is set up on the variable given by part1 and part2, such
|
2289 |
* that future references to the variable will be intermediated by
|
2290 |
* proc. See the manual entry for complete details on the calling
|
2291 |
* sequence for proc.
|
2292 |
*
|
2293 |
*----------------------------------------------------------------------
|
2294 |
*/
|
2295 |
|
2296 |
int
|
2297 |
Tcl_TraceVar2(interp, part1, part2, flags, proc, clientData)
|
2298 |
Tcl_Interp *interp; /* Interpreter in which variable is
|
2299 |
* to be traced. */
|
2300 |
char *part1; /* Name of scalar variable or array. */
|
2301 |
char *part2; /* Name of element within array; NULL means
|
2302 |
* trace applies to scalar variable or array
|
2303 |
* as-a-whole. */
|
2304 |
int flags; /* OR-ed collection of bits, including any
|
2305 |
* of TCL_TRACE_READS, TCL_TRACE_WRITES,
|
2306 |
* TCL_TRACE_UNSETS, TCL_GLOBAL_ONLY,
|
2307 |
* and TCL_NAMESPACE_ONLY. */
|
2308 |
Tcl_VarTraceProc *proc; /* Procedure to call when specified ops are
|
2309 |
* invoked upon varName. */
|
2310 |
ClientData clientData; /* Arbitrary argument to pass to proc. */
|
2311 |
{
|
2312 |
Var *varPtr, *arrayPtr;
|
2313 |
register VarTrace *tracePtr;
|
2314 |
|
2315 |
varPtr = TclLookupVar(interp, part1, part2, (flags | TCL_LEAVE_ERR_MSG),
|
2316 |
"trace", /*createPart1*/ 1, /*createPart2*/ 1, &arrayPtr);
|
2317 |
if (varPtr == NULL) {
|
2318 |
return TCL_ERROR;
|
2319 |
}
|
2320 |
|
2321 |
/*
|
2322 |
* Set up trace information.
|
2323 |
*/
|
2324 |
|
2325 |
tracePtr = (VarTrace *) ckalloc(sizeof(VarTrace));
|
2326 |
tracePtr->traceProc = proc;
|
2327 |
tracePtr->clientData = clientData;
|
2328 |
tracePtr->flags =
|
2329 |
flags & (TCL_TRACE_READS | TCL_TRACE_WRITES | TCL_TRACE_UNSETS |
|
2330 |
TCL_TRACE_ARRAY);
|
2331 |
tracePtr->nextPtr = varPtr->tracePtr;
|
2332 |
varPtr->tracePtr = tracePtr;
|
2333 |
return TCL_OK;
|
2334 |
}
|
2335 |
|
2336 |
/*
|
2337 |
*----------------------------------------------------------------------
|
2338 |
*
|
2339 |
* Tcl_UntraceVar --
|
2340 |
*
|
2341 |
* Remove a previously-created trace for a variable.
|
2342 |
*
|
2343 |
* Results:
|
2344 |
* None.
|
2345 |
*
|
2346 |
* Side effects:
|
2347 |
* If there exists a trace for the variable given by varName
|
2348 |
* with the given flags, proc, and clientData, then that trace
|
2349 |
* is removed.
|
2350 |
*
|
2351 |
*----------------------------------------------------------------------
|
2352 |
*/
|
2353 |
|
2354 |
void
|
2355 |
Tcl_UntraceVar(interp, varName, flags, proc, clientData)
|
2356 |
Tcl_Interp *interp; /* Interpreter containing variable. */
|
2357 |
char *varName; /* Name of variable; may end with "(index)"
|
2358 |
* to signify an array reference. */
|
2359 |
int flags; /* OR-ed collection of bits describing
|
2360 |
* current trace, including any of
|
2361 |
* TCL_TRACE_READS, TCL_TRACE_WRITES,
|
2362 |
* TCL_TRACE_UNSETS, TCL_GLOBAL_ONLY
|
2363 |
* and TCL_NAMESPACE_ONLY. */
|
2364 |
Tcl_VarTraceProc *proc; /* Procedure assocated with trace. */
|
2365 |
ClientData clientData; /* Arbitrary argument to pass to proc. */
|
2366 |
{
|
2367 |
Tcl_UntraceVar2(interp, varName, (char *) NULL, flags, proc, clientData);
|
2368 |
}
|
2369 |
|
2370 |
/*
|
2371 |
*----------------------------------------------------------------------
|
2372 |
*
|
2373 |
* Tcl_UntraceVar2 --
|
2374 |
*
|
2375 |
* Remove a previously-created trace for a variable.
|
2376 |
*
|
2377 |
* Results:
|
2378 |
* None.
|
2379 |
*
|
2380 |
* Side effects:
|
2381 |
* If there exists a trace for the variable given by part1
|
2382 |
* and part2 with the given flags, proc, and clientData, then
|
2383 |
* that trace is removed.
|
2384 |
*
|
2385 |
*----------------------------------------------------------------------
|
2386 |
*/
|
2387 |
|
2388 |
void
|
2389 |
Tcl_UntraceVar2(interp, part1, part2, flags, proc, clientData)
|
2390 |
Tcl_Interp *interp; /* Interpreter containing variable. */
|
2391 |
char *part1; /* Name of variable or array. */
|
2392 |
char *part2; /* Name of element within array; NULL means
|
2393 |
* trace applies to scalar variable or array
|
2394 |
* as-a-whole. */
|
2395 |
int flags; /* OR-ed collection of bits describing
|
2396 |
* current trace, including any of
|
2397 |
* TCL_TRACE_READS, TCL_TRACE_WRITES,
|
2398 |
* TCL_TRACE_UNSETS, TCL_GLOBAL_ONLY,
|
2399 |
* and TCL_NAMESPACE_ONLY. */
|
2400 |
Tcl_VarTraceProc *proc; /* Procedure assocated with trace. */
|
2401 |
ClientData clientData; /* Arbitrary argument to pass to proc. */
|
2402 |
{
|
2403 |
register VarTrace *tracePtr;
|
2404 |
VarTrace *prevPtr;
|
2405 |
Var *varPtr, *arrayPtr;
|
2406 |
Interp *iPtr = (Interp *) interp;
|
2407 |
ActiveVarTrace *activePtr;
|
2408 |
|
2409 |
varPtr = TclLookupVar(interp, part1, part2,
|
2410 |
flags & (TCL_GLOBAL_ONLY|TCL_NAMESPACE_ONLY),
|
2411 |
/*msg*/ (char *) NULL,
|
2412 |
/*createPart1*/ 0, /*createPart2*/ 0, &arrayPtr);
|
2413 |
if (varPtr == NULL) {
|
2414 |
return;
|
2415 |
}
|
2416 |
|
2417 |
flags &= (TCL_TRACE_READS | TCL_TRACE_WRITES | TCL_TRACE_UNSETS |
|
2418 |
TCL_TRACE_ARRAY);
|
2419 |
for (tracePtr = varPtr->tracePtr, prevPtr = NULL; ;
|
2420 |
prevPtr = tracePtr, tracePtr = tracePtr->nextPtr) {
|
2421 |
if (tracePtr == NULL) {
|
2422 |
return;
|
2423 |
}
|
2424 |
if ((tracePtr->traceProc == proc) && (tracePtr->flags == flags)
|
2425 |
&& (tracePtr->clientData == clientData)) {
|
2426 |
break;
|
2427 |
}
|
2428 |
}
|
2429 |
|
2430 |
/*
|
2431 |
* The code below makes it possible to delete traces while traces
|
2432 |
* are active: it makes sure that the deleted trace won't be
|
2433 |
* processed by CallTraces.
|
2434 |
*/
|
2435 |
|
2436 |
for (activePtr = iPtr->activeTracePtr; activePtr != NULL;
|
2437 |
activePtr = activePtr->nextPtr) {
|
2438 |
if (activePtr->nextTracePtr == tracePtr) {
|
2439 |
activePtr->nextTracePtr = tracePtr->nextPtr;
|
2440 |
}
|
2441 |
}
|
2442 |
if (prevPtr == NULL) {
|
2443 |
varPtr->tracePtr = tracePtr->nextPtr;
|
2444 |
} else {
|
2445 |
prevPtr->nextPtr = tracePtr->nextPtr;
|
2446 |
}
|
2447 |
ckfree((char *) tracePtr);
|
2448 |
|
2449 |
/*
|
2450 |
* If this is the last trace on the variable, and the variable is
|
2451 |
* unset and unused, then free up the variable.
|
2452 |
*/
|
2453 |
|
2454 |
if (TclIsVarUndefined(varPtr)) {
|
2455 |
CleanupVar(varPtr, (Var *) NULL);
|
2456 |
}
|
2457 |
}
|
2458 |
|
2459 |
/*
|
2460 |
*----------------------------------------------------------------------
|
2461 |
*
|
2462 |
* Tcl_VarTraceInfo --
|
2463 |
*
|
2464 |
* Return the clientData value associated with a trace on a
|
2465 |
* variable. This procedure can also be used to step through
|
2466 |
* all of the traces on a particular variable that have the
|
2467 |
* same trace procedure.
|
2468 |
*
|
2469 |
* Results:
|
2470 |
* The return value is the clientData value associated with
|
2471 |
* a trace on the given variable. Information will only be
|
2472 |
* returned for a trace with proc as trace procedure. If
|
2473 |
* the clientData argument is NULL then the first such trace is
|
2474 |
* returned; otherwise, the next relevant one after the one
|
2475 |
* given by clientData will be returned. If the variable
|
2476 |
* doesn't exist, or if there are no (more) traces for it,
|
2477 |
* then NULL is returned.
|
2478 |
*
|
2479 |
* Side effects:
|
2480 |
* None.
|
2481 |
*
|
2482 |
*----------------------------------------------------------------------
|
2483 |
*/
|
2484 |
|
2485 |
ClientData
|
2486 |
Tcl_VarTraceInfo(interp, varName, flags, proc, prevClientData)
|
2487 |
Tcl_Interp *interp; /* Interpreter containing variable. */
|
2488 |
char *varName; /* Name of variable; may end with "(index)"
|
2489 |
* to signify an array reference. */
|
2490 |
int flags; /* OR-ed combo or TCL_GLOBAL_ONLY,
|
2491 |
* TCL_NAMESPACE_ONLY (can be 0). */
|
2492 |
Tcl_VarTraceProc *proc; /* Procedure assocated with trace. */
|
2493 |
ClientData prevClientData; /* If non-NULL, gives last value returned
|
2494 |
* by this procedure, so this call will
|
2495 |
* return the next trace after that one.
|
2496 |
* If NULL, this call will return the
|
2497 |
* first trace. */
|
2498 |
{
|
2499 |
return Tcl_VarTraceInfo2(interp, varName, (char *) NULL,
|
2500 |
flags, proc, prevClientData);
|
2501 |
}
|
2502 |
|
2503 |
/*
|
2504 |
*----------------------------------------------------------------------
|
2505 |
*
|
2506 |
* Tcl_VarTraceInfo2 --
|
2507 |
*
|
2508 |
* Same as Tcl_VarTraceInfo, except takes name in two pieces
|
2509 |
* instead of one.
|
2510 |
*
|
2511 |
* Results:
|
2512 |
* Same as Tcl_VarTraceInfo.
|
2513 |
*
|
2514 |
* Side effects:
|
2515 |
* None.
|
2516 |
*
|
2517 |
*----------------------------------------------------------------------
|
2518 |
*/
|
2519 |
|
2520 |
ClientData
|
2521 |
Tcl_VarTraceInfo2(interp, part1, part2, flags, proc, prevClientData)
|
2522 |
Tcl_Interp *interp; /* Interpreter containing variable. */
|
2523 |
char *part1; /* Name of variable or array. */
|
2524 |
char *part2; /* Name of element within array; NULL means
|
2525 |
* trace applies to scalar variable or array
|
2526 |
* as-a-whole. */
|
2527 |
int flags; /* OR-ed combination of TCL_GLOBAL_ONLY,
|
2528 |
* TCL_NAMESPACE_ONLY. */
|
2529 |
Tcl_VarTraceProc *proc; /* Procedure assocated with trace. */
|
2530 |
ClientData prevClientData; /* If non-NULL, gives last value returned
|
2531 |
* by this procedure, so this call will
|
2532 |
* return the next trace after that one.
|
2533 |
* If NULL, this call will return the
|
2534 |
* first trace. */
|
2535 |
{
|
2536 |
register VarTrace *tracePtr;
|
2537 |
Var *varPtr, *arrayPtr;
|
2538 |
|
2539 |
varPtr = TclLookupVar(interp, part1, part2,
|
2540 |
flags & (TCL_GLOBAL_ONLY|TCL_NAMESPACE_ONLY),
|
2541 |
/*msg*/ (char *) NULL,
|
2542 |
/*createPart1*/ 0, /*createPart2*/ 0, &arrayPtr);
|
2543 |
if (varPtr == NULL) {
|
2544 |
return NULL;
|
2545 |
}
|
2546 |
|
2547 |
/*
|
2548 |
* Find the relevant trace, if any, and return its clientData.
|
2549 |
*/
|
2550 |
|
2551 |
tracePtr = varPtr->tracePtr;
|
2552 |
if (prevClientData != NULL) {
|
2553 |
for ( ; tracePtr != NULL; tracePtr = tracePtr->nextPtr) {
|
2554 |
if ((tracePtr->clientData == prevClientData)
|
2555 |
&& (tracePtr->traceProc == proc)) {
|
2556 |
tracePtr = tracePtr->nextPtr;
|
2557 |
break;
|
2558 |
}
|
2559 |
}
|
2560 |
}
|
2561 |
for ( ; tracePtr != NULL; tracePtr = tracePtr->nextPtr) {
|
2562 |
if (tracePtr->traceProc == proc) {
|
2563 |
return tracePtr->clientData;
|
2564 |
}
|
2565 |
}
|
2566 |
return NULL;
|
2567 |
}
|
2568 |
|
2569 |
/*
|
2570 |
*----------------------------------------------------------------------
|
2571 |
*
|
2572 |
* Tcl_UnsetObjCmd --
|
2573 |
*
|
2574 |
* This object-based procedure is invoked to process the "unset" Tcl
|
2575 |
* command. See the user documentation for details on what it does.
|
2576 |
*
|
2577 |
* Results:
|
2578 |
* A standard Tcl object result value.
|
2579 |
*
|
2580 |
* Side effects:
|
2581 |
* See the user documentation.
|
2582 |
*
|
2583 |
*----------------------------------------------------------------------
|
2584 |
*/
|
2585 |
|
2586 |
/* ARGSUSED */
|
2587 |
int
|
2588 |
Tcl_UnsetObjCmd(dummy, interp, objc, objv)
|
2589 |
ClientData dummy; /* Not used. */
|
2590 |
Tcl_Interp *interp; /* Current interpreter. */
|
2591 |
int objc; /* Number of arguments. */
|
2592 |
Tcl_Obj *CONST objv[]; /* Argument objects. */
|
2593 |
{
|
2594 |
register int i;
|
2595 |
register char *name;
|
2596 |
|
2597 |
if (objc < 2) {
|
2598 |
Tcl_WrongNumArgs(interp, 1, objv, "varName ?varName ...?");
|
2599 |
return TCL_ERROR;
|
2600 |
}
|
2601 |
|
2602 |
for (i = 1; i < objc; i++) {
|
2603 |
name = TclGetString(objv[i]);
|
2604 |
if (Tcl_UnsetVar2(interp, name, (char *) NULL,
|
2605 |
TCL_LEAVE_ERR_MSG) != TCL_OK) {
|
2606 |
return TCL_ERROR;
|
2607 |
}
|
2608 |
}
|
2609 |
return TCL_OK;
|
2610 |
}
|
2611 |
|
2612 |
/*
|
2613 |
*----------------------------------------------------------------------
|
2614 |
*
|
2615 |
* Tcl_AppendObjCmd --
|
2616 |
*
|
2617 |
* This object-based procedure is invoked to process the "append"
|
2618 |
* Tcl command. See the user documentation for details on what it does.
|
2619 |
*
|
2620 |
* Results:
|
2621 |
* A standard Tcl object result value.
|
2622 |
*
|
2623 |
* Side effects:
|
2624 |
* A variable's value may be changed.
|
2625 |
*
|
2626 |
*----------------------------------------------------------------------
|
2627 |
*/
|
2628 |
|
2629 |
/* ARGSUSED */
|
2630 |
int
|
2631 |
Tcl_AppendObjCmd(dummy, interp, objc, objv)
|
2632 |
ClientData dummy; /* Not used. */
|
2633 |
Tcl_Interp *interp; /* Current interpreter. */
|
2634 |
int objc; /* Number of arguments. */
|
2635 |
Tcl_Obj *CONST objv[]; /* Argument objects. */
|
2636 |
{
|
2637 |
register Tcl_Obj *varValuePtr = NULL;
|
2638 |
/* Initialized to avoid compiler
|
2639 |
* warning. */
|
2640 |
int i;
|
2641 |
|
2642 |
if (objc < 2) {
|
2643 |
Tcl_WrongNumArgs(interp, 1, objv, "varName ?value value ...?");
|
2644 |
return TCL_ERROR;
|
2645 |
}
|
2646 |
if (objc == 2) {
|
2647 |
varValuePtr = Tcl_ObjGetVar2(interp, objv[1], NULL, TCL_LEAVE_ERR_MSG);
|
2648 |
if (varValuePtr == NULL) {
|
2649 |
return TCL_ERROR;
|
2650 |
}
|
2651 |
} else {
|
2652 |
for (i = 2; i < objc; i++) {
|
2653 |
varValuePtr = Tcl_ObjSetVar2(interp, objv[1], (Tcl_Obj *) NULL,
|
2654 |
objv[i], (TCL_APPEND_VALUE | TCL_LEAVE_ERR_MSG));
|
2655 |
if (varValuePtr == NULL) {
|
2656 |
return TCL_ERROR;
|
2657 |
}
|
2658 |
}
|
2659 |
}
|
2660 |
Tcl_SetObjResult(interp, varValuePtr);
|
2661 |
return TCL_OK;
|
2662 |
}
|
2663 |
|
2664 |
/*
|
2665 |
*----------------------------------------------------------------------
|
2666 |
*
|
2667 |
* Tcl_LappendObjCmd --
|
2668 |
*
|
2669 |
* This object-based procedure is invoked to process the "lappend"
|
2670 |
* Tcl command. See the user documentation for details on what it does.
|
2671 |
*
|
2672 |
* Results:
|
2673 |
* A standard Tcl object result value.
|
2674 |
*
|
2675 |
* Side effects:
|
2676 |
* A variable's value may be changed.
|
2677 |
*
|
2678 |
*----------------------------------------------------------------------
|
2679 |
*/
|
2680 |
|
2681 |
/* ARGSUSED */
|
2682 |
int
|
2683 |
Tcl_LappendObjCmd(dummy, interp, objc, objv)
|
2684 |
ClientData dummy; /* Not used. */
|
2685 |
Tcl_Interp *interp; /* Current interpreter. */
|
2686 |
int objc; /* Number of arguments. */
|
2687 |
Tcl_Obj *CONST objv[]; /* Argument objects. */
|
2688 |
{
|
2689 |
Tcl_Obj *varValuePtr, *newValuePtr;
|
2690 |
register List *listRepPtr;
|
2691 |
register Tcl_Obj **elemPtrs;
|
2692 |
int numElems, numRequired, createdNewObj, createVar, i, j;
|
2693 |
|
2694 |
if (objc < 2) {
|
2695 |
Tcl_WrongNumArgs(interp, 1, objv, "varName ?value value ...?");
|
2696 |
return TCL_ERROR;
|
2697 |
}
|
2698 |
if (objc == 2) {
|
2699 |
newValuePtr = Tcl_ObjGetVar2(interp, objv[1], (Tcl_Obj *) NULL,
|
2700 |
(TCL_LEAVE_ERR_MSG));
|
2701 |
if (newValuePtr == NULL) {
|
2702 |
/*
|
2703 |
* The variable doesn't exist yet. Just create it with an empty
|
2704 |
* initial value.
|
2705 |
*/
|
2706 |
|
2707 |
Tcl_Obj *nullObjPtr = Tcl_NewObj();
|
2708 |
newValuePtr = Tcl_ObjSetVar2(interp, objv[1], NULL,
|
2709 |
nullObjPtr, TCL_LEAVE_ERR_MSG);
|
2710 |
if (newValuePtr == NULL) {
|
2711 |
Tcl_DecrRefCount(nullObjPtr); /* free unneeded object */
|
2712 |
return TCL_ERROR;
|
2713 |
}
|
2714 |
}
|
2715 |
} else {
|
2716 |
/*
|
2717 |
* We have arguments to append. We used to call Tcl_SetVar2 to
|
2718 |
* append each argument one at a time to ensure that traces were run
|
2719 |
* for each append step. We now append the arguments all at once
|
2720 |
* because it's faster. Note that a read trace and a write trace for
|
2721 |
* the variable will now each only be called once. Also, if the
|
2722 |
* variable's old value is unshared we modify it directly, otherwise
|
2723 |
* we create a new copy to modify: this is "copy on write".
|
2724 |
*/
|
2725 |
|
2726 |
createdNewObj = 0;
|
2727 |
createVar = 1;
|
2728 |
varValuePtr = Tcl_ObjGetVar2(interp, objv[1], NULL, 0);
|
2729 |
if (varValuePtr == NULL) {
|
2730 |
/*
|
2731 |
* We couldn't read the old value: either the var doesn't yet
|
2732 |
* exist or it's an array element. If it's new, we will try to
|
2733 |
* create it with Tcl_ObjSetVar2 below.
|
2734 |
*/
|
2735 |
|
2736 |
char *p, *varName;
|
2737 |
int nameBytes, i;
|
2738 |
|
2739 |
varName = Tcl_GetStringFromObj(objv[1], &nameBytes);
|
2740 |
for (i = 0, p = varName; i < nameBytes; i++, p++) {
|
2741 |
if (*p == '(') {
|
2742 |
p = (varName + nameBytes-1);
|
2743 |
if (*p == ')') { /* last char is ')' => array ref */
|
2744 |
createVar = 0;
|
2745 |
}
|
2746 |
break;
|
2747 |
}
|
2748 |
}
|
2749 |
varValuePtr = Tcl_NewObj();
|
2750 |
createdNewObj = 1;
|
2751 |
} else if (Tcl_IsShared(varValuePtr)) {
|
2752 |
varValuePtr = Tcl_DuplicateObj(varValuePtr);
|
2753 |
createdNewObj = 1;
|
2754 |
}
|
2755 |
|
2756 |
/*
|
2757 |
* Convert the variable's old value to a list object if necessary.
|
2758 |
*/
|
2759 |
|
2760 |
if (varValuePtr->typePtr != &tclListType) {
|
2761 |
int result = tclListType.setFromAnyProc(interp, varValuePtr);
|
2762 |
if (result != TCL_OK) {
|
2763 |
if (createdNewObj) {
|
2764 |
Tcl_DecrRefCount(varValuePtr); /* free unneeded obj. */
|
2765 |
}
|
2766 |
return result;
|
2767 |
}
|
2768 |
}
|
2769 |
listRepPtr = (List *) varValuePtr->internalRep.otherValuePtr;
|
2770 |
elemPtrs = listRepPtr->elements;
|
2771 |
numElems = listRepPtr->elemCount;
|
2772 |
|
2773 |
/*
|
2774 |
* If there is no room in the current array of element pointers,
|
2775 |
* allocate a new, larger array and copy the pointers to it.
|
2776 |
*/
|
2777 |
|
2778 |
numRequired = numElems + (objc-2);
|
2779 |
if (numRequired > listRepPtr->maxElemCount) {
|
2780 |
int newMax = (2 * numRequired);
|
2781 |
Tcl_Obj **newElemPtrs = (Tcl_Obj **)
|
2782 |
ckalloc((unsigned) (newMax * sizeof(Tcl_Obj *)));
|
2783 |
|
2784 |
memcpy((VOID *) newElemPtrs, (VOID *) elemPtrs,
|
2785 |
(size_t) (numElems * sizeof(Tcl_Obj *)));
|
2786 |
listRepPtr->maxElemCount = newMax;
|
2787 |
listRepPtr->elements = newElemPtrs;
|
2788 |
ckfree((char *) elemPtrs);
|
2789 |
elemPtrs = newElemPtrs;
|
2790 |
}
|
2791 |
|
2792 |
/*
|
2793 |
* Insert the new elements at the end of the list.
|
2794 |
*/
|
2795 |
|
2796 |
for (i = 2, j = numElems; i < objc; i++, j++) {
|
2797 |
elemPtrs[j] = objv[i];
|
2798 |
Tcl_IncrRefCount(objv[i]);
|
2799 |
}
|
2800 |
listRepPtr->elemCount = numRequired;
|
2801 |
|
2802 |
/*
|
2803 |
* Invalidate and free any old string representation since it no
|
2804 |
* longer reflects the list's internal representation.
|
2805 |
*/
|
2806 |
|
2807 |
Tcl_InvalidateStringRep(varValuePtr);
|
2808 |
|
2809 |
/*
|
2810 |
* Now store the list object back into the variable. If there is an
|
2811 |
* error setting the new value, decrement its ref count if it
|
2812 |
* was new and we didn't create the variable.
|
2813 |
*/
|
2814 |
|
2815 |
newValuePtr = Tcl_ObjSetVar2(interp, objv[1], NULL, varValuePtr,
|
2816 |
TCL_LEAVE_ERR_MSG);
|
2817 |
if (newValuePtr == NULL) {
|
2818 |
if (createdNewObj && !createVar) {
|
2819 |
Tcl_DecrRefCount(varValuePtr); /* free unneeded obj */
|
2820 |
}
|
2821 |
return TCL_ERROR;
|
2822 |
}
|
2823 |
}
|
2824 |
|
2825 |
/*
|
2826 |
* Set the interpreter's object result to refer to the variable's value
|
2827 |
* object.
|
2828 |
*/
|
2829 |
|
2830 |
Tcl_SetObjResult(interp, newValuePtr);
|
2831 |
return TCL_OK;
|
2832 |
}
|
2833 |
|
2834 |
/*
|
2835 |
*----------------------------------------------------------------------
|
2836 |
*
|
2837 |
* Tcl_ArrayObjCmd --
|
2838 |
*
|
2839 |
* This object-based procedure is invoked to process the "array" Tcl
|
2840 |
* command. See the user documentation for details on what it does.
|
2841 |
*
|
2842 |
* Results:
|
2843 |
* A standard Tcl result object.
|
2844 |
*
|
2845 |
* Side effects:
|
2846 |
* See the user documentation.
|
2847 |
*
|
2848 |
*----------------------------------------------------------------------
|
2849 |
*/
|
2850 |
|
2851 |
/* ARGSUSED */
|
2852 |
int
|
2853 |
Tcl_ArrayObjCmd(dummy, interp, objc, objv)
|
2854 |
ClientData dummy; /* Not used. */
|
2855 |
Tcl_Interp *interp; /* Current interpreter. */
|
2856 |
int objc; /* Number of arguments. */
|
2857 |
Tcl_Obj *CONST objv[]; /* Argument objects. */
|
2858 |
{
|
2859 |
/*
|
2860 |
* The list of constants below should match the arrayOptions string array
|
2861 |
* below.
|
2862 |
*/
|
2863 |
|
2864 |
enum {ARRAY_ANYMORE, ARRAY_DONESEARCH, ARRAY_EXISTS, ARRAY_GET,
|
2865 |
ARRAY_NAMES, ARRAY_NEXTELEMENT, ARRAY_SET, ARRAY_SIZE,
|
2866 |
ARRAY_STARTSEARCH, ARRAY_UNSET};
|
2867 |
static char *arrayOptions[] = {
|
2868 |
"anymore", "donesearch", "exists", "get", "names", "nextelement",
|
2869 |
"set", "size", "startsearch", "unset", (char *) NULL
|
2870 |
};
|
2871 |
|
2872 |
Interp *iPtr = (Interp *) interp;
|
2873 |
Var *varPtr, *arrayPtr;
|
2874 |
Tcl_HashEntry *hPtr;
|
2875 |
Tcl_Obj *resultPtr = Tcl_GetObjResult(interp);
|
2876 |
int notArray;
|
2877 |
char *varName, *msg;
|
2878 |
int index, result;
|
2879 |
|
2880 |
|
2881 |
if (objc < 3) {
|
2882 |
Tcl_WrongNumArgs(interp, 1, objv, "option arrayName ?arg ...?");
|
2883 |
return TCL_ERROR;
|
2884 |
}
|
2885 |
|
2886 |
if (Tcl_GetIndexFromObj(interp, objv[1], arrayOptions, "option",
|
2887 |
0, &index) != TCL_OK) {
|
2888 |
return TCL_ERROR;
|
2889 |
}
|
2890 |
|
2891 |
/*
|
2892 |
* Locate the array variable (and it better be an array).
|
2893 |
*/
|
2894 |
|
2895 |
varName = TclGetString(objv[2]);
|
2896 |
varPtr = TclLookupVar(interp, varName, (char *) NULL, /*flags*/ 0,
|
2897 |
/*msg*/ 0, /*createPart1*/ 0, /*createPart2*/ 0, &arrayPtr);
|
2898 |
|
2899 |
notArray = 0;
|
2900 |
if ((varPtr == NULL) || !TclIsVarArray(varPtr)
|
2901 |
|| TclIsVarUndefined(varPtr)) {
|
2902 |
notArray = 1;
|
2903 |
}
|
2904 |
|
2905 |
/*
|
2906 |
* Special array trace used to keep the env array in sync for
|
2907 |
* array names, array get, etc.
|
2908 |
*/
|
2909 |
|
2910 |
if (varPtr != NULL && varPtr->tracePtr != NULL) {
|
2911 |
msg = CallTraces(iPtr, arrayPtr, varPtr, varName, NULL,
|
2912 |
(TCL_LEAVE_ERR_MSG|TCL_NAMESPACE_ONLY|TCL_GLOBAL_ONLY|
|
2913 |
TCL_TRACE_ARRAY));
|
2914 |
if (msg != NULL) {
|
2915 |
VarErrMsg(interp, varName, NULL, "trace array", msg);
|
2916 |
return TCL_ERROR;
|
2917 |
}
|
2918 |
}
|
2919 |
|
2920 |
switch (index) {
|
2921 |
case ARRAY_ANYMORE: {
|
2922 |
ArraySearch *searchPtr;
|
2923 |
char *searchId;
|
2924 |
|
2925 |
if (objc != 4) {
|
2926 |
Tcl_WrongNumArgs(interp, 2, objv,
|
2927 |
"arrayName searchId");
|
2928 |
return TCL_ERROR;
|
2929 |
}
|
2930 |
if (notArray) {
|
2931 |
goto error;
|
2932 |
}
|
2933 |
searchId = Tcl_GetString(objv[3]);
|
2934 |
searchPtr = ParseSearchId(interp, varPtr, varName, searchId);
|
2935 |
if (searchPtr == NULL) {
|
2936 |
return TCL_ERROR;
|
2937 |
}
|
2938 |
while (1) {
|
2939 |
Var *varPtr2;
|
2940 |
|
2941 |
if (searchPtr->nextEntry != NULL) {
|
2942 |
varPtr2 = (Var *) Tcl_GetHashValue(searchPtr->nextEntry);
|
2943 |
if (!TclIsVarUndefined(varPtr2)) {
|
2944 |
break;
|
2945 |
}
|
2946 |
}
|
2947 |
searchPtr->nextEntry = Tcl_NextHashEntry(&searchPtr->search);
|
2948 |
if (searchPtr->nextEntry == NULL) {
|
2949 |
Tcl_SetIntObj(resultPtr, 0);
|
2950 |
return TCL_OK;
|
2951 |
}
|
2952 |
}
|
2953 |
Tcl_SetIntObj(resultPtr, 1);
|
2954 |
break;
|
2955 |
}
|
2956 |
case ARRAY_DONESEARCH: {
|
2957 |
ArraySearch *searchPtr, *prevPtr;
|
2958 |
char *searchId;
|
2959 |
|
2960 |
if (objc != 4) {
|
2961 |
Tcl_WrongNumArgs(interp, 2, objv,
|
2962 |
"arrayName searchId");
|
2963 |
return TCL_ERROR;
|
2964 |
}
|
2965 |
if (notArray) {
|
2966 |
goto error;
|
2967 |
}
|
2968 |
searchId = Tcl_GetString(objv[3]);
|
2969 |
searchPtr = ParseSearchId(interp, varPtr, varName, searchId);
|
2970 |
if (searchPtr == NULL) {
|
2971 |
return TCL_ERROR;
|
2972 |
}
|
2973 |
if (varPtr->searchPtr == searchPtr) {
|
2974 |
varPtr->searchPtr = searchPtr->nextPtr;
|
2975 |
} else {
|
2976 |
for (prevPtr = varPtr->searchPtr; ;
|
2977 |
prevPtr = prevPtr->nextPtr) {
|
2978 |
if (prevPtr->nextPtr == searchPtr) {
|
2979 |
prevPtr->nextPtr = searchPtr->nextPtr;
|
2980 |
break;
|
2981 |
}
|
2982 |
}
|
2983 |
}
|
2984 |
ckfree((char *) searchPtr);
|
2985 |
break;
|
2986 |
}
|
2987 |
case ARRAY_EXISTS: {
|
2988 |
if (objc != 3) {
|
2989 |
Tcl_WrongNumArgs(interp, 2, objv, "arrayName");
|
2990 |
return TCL_ERROR;
|
2991 |
}
|
2992 |
Tcl_SetIntObj(resultPtr, !notArray);
|
2993 |
break;
|
2994 |
}
|
2995 |
case ARRAY_GET: {
|
2996 |
Tcl_HashSearch search;
|
2997 |
Var *varPtr2;
|
2998 |
char *pattern = NULL;
|
2999 |
char *name;
|
3000 |
Tcl_Obj *namePtr, *valuePtr;
|
3001 |
|
3002 |
if ((objc != 3) && (objc != 4)) {
|
3003 |
Tcl_WrongNumArgs(interp, 2, objv, "arrayName ?pattern?");
|
3004 |
return TCL_ERROR;
|
3005 |
}
|
3006 |
if (notArray) {
|
3007 |
return TCL_OK;
|
3008 |
}
|
3009 |
if (objc == 4) {
|
3010 |
pattern = TclGetString(objv[3]);
|
3011 |
}
|
3012 |
for (hPtr = Tcl_FirstHashEntry(varPtr->value.tablePtr, &search);
|
3013 |
hPtr != NULL; hPtr = Tcl_NextHashEntry(&search)) {
|
3014 |
varPtr2 = (Var *) Tcl_GetHashValue(hPtr);
|
3015 |
if (TclIsVarUndefined(varPtr2)) {
|
3016 |
continue;
|
3017 |
}
|
3018 |
name = Tcl_GetHashKey(varPtr->value.tablePtr, hPtr);
|
3019 |
if ((objc == 4) && !Tcl_StringMatch(name, pattern)) {
|
3020 |
continue; /* element name doesn't match pattern */
|
3021 |
}
|
3022 |
|
3023 |
namePtr = Tcl_NewStringObj(name, -1);
|
3024 |
result = Tcl_ListObjAppendElement(interp, resultPtr,
|
3025 |
namePtr);
|
3026 |
if (result != TCL_OK) {
|
3027 |
Tcl_DecrRefCount(namePtr); /* free unneeded name obj */
|
3028 |
return result;
|
3029 |
}
|
3030 |
|
3031 |
valuePtr = Tcl_ObjGetVar2(interp, objv[2], namePtr,
|
3032 |
TCL_LEAVE_ERR_MSG);
|
3033 |
if (valuePtr == NULL) {
|
3034 |
Tcl_DecrRefCount(namePtr); /* free unneeded name obj */
|
3035 |
return result;
|
3036 |
}
|
3037 |
result = Tcl_ListObjAppendElement(interp, resultPtr,
|
3038 |
valuePtr);
|
3039 |
if (result != TCL_OK) {
|
3040 |
Tcl_DecrRefCount(namePtr); /* free unneeded name obj */
|
3041 |
return result;
|
3042 |
}
|
3043 |
}
|
3044 |
break;
|
3045 |
}
|
3046 |
case ARRAY_NAMES: {
|
3047 |
Tcl_HashSearch search;
|
3048 |
Var *varPtr2;
|
3049 |
char *pattern = NULL;
|
3050 |
char *name;
|
3051 |
Tcl_Obj *namePtr;
|
3052 |
|
3053 |
if ((objc != 3) && (objc != 4)) {
|
3054 |
Tcl_WrongNumArgs(interp, 2, objv, "arrayName ?pattern?");
|
3055 |
return TCL_ERROR;
|
3056 |
}
|
3057 |
if (notArray) {
|
3058 |
return TCL_OK;
|
3059 |
}
|
3060 |
if (objc == 4) {
|
3061 |
pattern = Tcl_GetString(objv[3]);
|
3062 |
}
|
3063 |
for (hPtr = Tcl_FirstHashEntry(varPtr->value.tablePtr, &search);
|
3064 |
hPtr != NULL; hPtr = Tcl_NextHashEntry(&search)) {
|
3065 |
varPtr2 = (Var *) Tcl_GetHashValue(hPtr);
|
3066 |
if (TclIsVarUndefined(varPtr2)) {
|
3067 |
continue;
|
3068 |
}
|
3069 |
name = Tcl_GetHashKey(varPtr->value.tablePtr, hPtr);
|
3070 |
if ((objc == 4) && !Tcl_StringMatch(name, pattern)) {
|
3071 |
continue; /* element name doesn't match pattern */
|
3072 |
}
|
3073 |
|
3074 |
namePtr = Tcl_NewStringObj(name, -1);
|
3075 |
result = Tcl_ListObjAppendElement(interp, resultPtr, namePtr);
|
3076 |
if (result != TCL_OK) {
|
3077 |
Tcl_DecrRefCount(namePtr); /* free unneeded name obj */
|
3078 |
return result;
|
3079 |
}
|
3080 |
}
|
3081 |
break;
|
3082 |
}
|
3083 |
case ARRAY_NEXTELEMENT: {
|
3084 |
ArraySearch *searchPtr;
|
3085 |
char *searchId;
|
3086 |
Tcl_HashEntry *hPtr;
|
3087 |
|
3088 |
if (objc != 4) {
|
3089 |
Tcl_WrongNumArgs(interp, 2, objv,
|
3090 |
"arrayName searchId");
|
3091 |
return TCL_ERROR;
|
3092 |
}
|
3093 |
if (notArray) {
|
3094 |
goto error;
|
3095 |
}
|
3096 |
searchId = Tcl_GetString(objv[3]);
|
3097 |
searchPtr = ParseSearchId(interp, varPtr, varName, searchId);
|
3098 |
if (searchPtr == NULL) {
|
3099 |
return TCL_ERROR;
|
3100 |
}
|
3101 |
while (1) {
|
3102 |
Var *varPtr2;
|
3103 |
|
3104 |
hPtr = searchPtr->nextEntry;
|
3105 |
if (hPtr == NULL) {
|
3106 |
hPtr = Tcl_NextHashEntry(&searchPtr->search);
|
3107 |
if (hPtr == NULL) {
|
3108 |
return TCL_OK;
|
3109 |
}
|
3110 |
} else {
|
3111 |
searchPtr->nextEntry = NULL;
|
3112 |
}
|
3113 |
varPtr2 = (Var *) Tcl_GetHashValue(hPtr);
|
3114 |
if (!TclIsVarUndefined(varPtr2)) {
|
3115 |
break;
|
3116 |
}
|
3117 |
}
|
3118 |
Tcl_SetStringObj(resultPtr,
|
3119 |
Tcl_GetHashKey(varPtr->value.tablePtr, hPtr), -1);
|
3120 |
break;
|
3121 |
}
|
3122 |
case ARRAY_SET: {
|
3123 |
if (objc != 4) {
|
3124 |
Tcl_WrongNumArgs(interp, 2, objv, "arrayName list");
|
3125 |
return TCL_ERROR;
|
3126 |
}
|
3127 |
return(TclArraySet(interp, objv[2], objv[3]));
|
3128 |
}
|
3129 |
case ARRAY_SIZE: {
|
3130 |
Tcl_HashSearch search;
|
3131 |
Var *varPtr2;
|
3132 |
int size;
|
3133 |
|
3134 |
if (objc != 3) {
|
3135 |
Tcl_WrongNumArgs(interp, 2, objv, "arrayName");
|
3136 |
return TCL_ERROR;
|
3137 |
}
|
3138 |
size = 0;
|
3139 |
if (!notArray) {
|
3140 |
for (hPtr = Tcl_FirstHashEntry(varPtr->value.tablePtr,
|
3141 |
&search);
|
3142 |
hPtr != NULL; hPtr = Tcl_NextHashEntry(&search)) {
|
3143 |
varPtr2 = (Var *) Tcl_GetHashValue(hPtr);
|
3144 |
if (TclIsVarUndefined(varPtr2)) {
|
3145 |
continue;
|
3146 |
}
|
3147 |
size++;
|
3148 |
}
|
3149 |
}
|
3150 |
Tcl_SetIntObj(resultPtr, size);
|
3151 |
break;
|
3152 |
}
|
3153 |
case ARRAY_STARTSEARCH: {
|
3154 |
ArraySearch *searchPtr;
|
3155 |
|
3156 |
if (objc != 3) {
|
3157 |
Tcl_WrongNumArgs(interp, 2, objv, "arrayName");
|
3158 |
return TCL_ERROR;
|
3159 |
}
|
3160 |
if (notArray) {
|
3161 |
goto error;
|
3162 |
}
|
3163 |
searchPtr = (ArraySearch *) ckalloc(sizeof(ArraySearch));
|
3164 |
if (varPtr->searchPtr == NULL) {
|
3165 |
searchPtr->id = 1;
|
3166 |
Tcl_AppendStringsToObj(resultPtr, "s-1-", varName,
|
3167 |
(char *) NULL);
|
3168 |
} else {
|
3169 |
char string[TCL_INTEGER_SPACE];
|
3170 |
|
3171 |
searchPtr->id = varPtr->searchPtr->id + 1;
|
3172 |
TclFormatInt(string, searchPtr->id);
|
3173 |
Tcl_AppendStringsToObj(resultPtr, "s-", string, "-", varName,
|
3174 |
(char *) NULL);
|
3175 |
}
|
3176 |
searchPtr->varPtr = varPtr;
|
3177 |
searchPtr->nextEntry = Tcl_FirstHashEntry(varPtr->value.tablePtr,
|
3178 |
&searchPtr->search);
|
3179 |
searchPtr->nextPtr = varPtr->searchPtr;
|
3180 |
varPtr->searchPtr = searchPtr;
|
3181 |
break;
|
3182 |
}
|
3183 |
case ARRAY_UNSET: {
|
3184 |
Tcl_HashSearch search;
|
3185 |
Var *varPtr2;
|
3186 |
char *pattern = NULL;
|
3187 |
char *name;
|
3188 |
|
3189 |
if ((objc != 3) && (objc != 4)) {
|
3190 |
Tcl_WrongNumArgs(interp, 2, objv, "arrayName ?pattern?");
|
3191 |
return TCL_ERROR;
|
3192 |
}
|
3193 |
if (notArray) {
|
3194 |
return TCL_OK;
|
3195 |
}
|
3196 |
if (objc == 3) {
|
3197 |
/*
|
3198 |
* When no pattern is given, just unset the whole array
|
3199 |
*/
|
3200 |
if (Tcl_UnsetVar2(interp, varName, (char *) NULL, 0)
|
3201 |
!= TCL_OK) {
|
3202 |
return TCL_ERROR;
|
3203 |
}
|
3204 |
} else {
|
3205 |
pattern = Tcl_GetString(objv[3]);
|
3206 |
for (hPtr = Tcl_FirstHashEntry(varPtr->value.tablePtr,
|
3207 |
&search);
|
3208 |
hPtr != NULL; hPtr = Tcl_NextHashEntry(&search)) {
|
3209 |
varPtr2 = (Var *) Tcl_GetHashValue(hPtr);
|
3210 |
if (TclIsVarUndefined(varPtr2)) {
|
3211 |
continue;
|
3212 |
}
|
3213 |
name = Tcl_GetHashKey(varPtr->value.tablePtr, hPtr);
|
3214 |
if (Tcl_StringMatch(name, pattern) &&
|
3215 |
(Tcl_UnsetVar2(interp, varName, name, 0)
|
3216 |
!= TCL_OK)) {
|
3217 |
return TCL_ERROR;
|
3218 |
}
|
3219 |
}
|
3220 |
}
|
3221 |
break;
|
3222 |
}
|
3223 |
}
|
3224 |
return TCL_OK;
|
3225 |
|
3226 |
error:
|
3227 |
Tcl_AppendStringsToObj(resultPtr, "\"", varName, "\" isn't an array",
|
3228 |
(char *) NULL);
|
3229 |
return TCL_ERROR;
|
3230 |
}
|
3231 |
|
3232 |
/*
|
3233 |
*----------------------------------------------------------------------
|
3234 |
*
|
3235 |
* TclArraySet --
|
3236 |
*
|
3237 |
* Set the elements of an array. If there are no elements to
|
3238 |
* set, create an empty array. This routine is used by the
|
3239 |
* Tcl_ArrayObjCmd and by the TclSetupEnv routine.
|
3240 |
*
|
3241 |
* Results:
|
3242 |
* A standard Tcl result object.
|
3243 |
*
|
3244 |
* Side effects:
|
3245 |
* A variable will be created if one does not already exist.
|
3246 |
*
|
3247 |
*----------------------------------------------------------------------
|
3248 |
*/
|
3249 |
|
3250 |
int
|
3251 |
TclArraySet(interp, arrayNameObj, arrayElemObj)
|
3252 |
Tcl_Interp *interp; /* Current interpreter. */
|
3253 |
Tcl_Obj *arrayNameObj; /* The array name. */
|
3254 |
Tcl_Obj *arrayElemObj; /* The array elements list. If this is
|
3255 |
* NULL, create an empty array. */
|
3256 |
{
|
3257 |
Var *varPtr, *arrayPtr;
|
3258 |
Tcl_Obj **elemPtrs;
|
3259 |
int result, elemLen, i;
|
3260 |
char *varName, *p;
|
3261 |
|
3262 |
varName = TclGetString(arrayNameObj);
|
3263 |
for (p = varName; *p ; p++) {
|
3264 |
if (*p == '(') {
|
3265 |
do {
|
3266 |
p++;
|
3267 |
} while (*p != '\0');
|
3268 |
p--;
|
3269 |
if (*p == ')') {
|
3270 |
VarErrMsg(interp, varName, NULL, "set", needArray);
|
3271 |
return TCL_ERROR;
|
3272 |
}
|
3273 |
break;
|
3274 |
}
|
3275 |
}
|
3276 |
|
3277 |
varPtr = TclLookupVar(interp, varName, (char *) NULL, /*flags*/ 0,
|
3278 |
/*msg*/ 0, /*createPart1*/ 0, /*createPart2*/ 0, &arrayPtr);
|
3279 |
|
3280 |
if (arrayElemObj != NULL) {
|
3281 |
result = Tcl_ListObjGetElements(interp, arrayElemObj,
|
3282 |
&elemLen, &elemPtrs);
|
3283 |
if (result != TCL_OK) {
|
3284 |
return result;
|
3285 |
}
|
3286 |
if (elemLen & 1) {
|
3287 |
Tcl_ResetResult(interp);
|
3288 |
Tcl_AppendToObj(Tcl_GetObjResult(interp),
|
3289 |
"list must have an even number of elements", -1);
|
3290 |
return TCL_ERROR;
|
3291 |
}
|
3292 |
if (elemLen > 0) {
|
3293 |
for (i = 0; i < elemLen; i += 2) {
|
3294 |
if (Tcl_ObjSetVar2(interp, arrayNameObj, elemPtrs[i],
|
3295 |
elemPtrs[i+1], TCL_LEAVE_ERR_MSG) == NULL) {
|
3296 |
result = TCL_ERROR;
|
3297 |
break;
|
3298 |
}
|
3299 |
}
|
3300 |
return result;
|
3301 |
}
|
3302 |
}
|
3303 |
|
3304 |
/*
|
3305 |
* The list is empty make sure we have an array, or create
|
3306 |
* one if necessary.
|
3307 |
*/
|
3308 |
|
3309 |
if (varPtr != NULL) {
|
3310 |
if (!TclIsVarUndefined(varPtr) && TclIsVarArray(varPtr)) {
|
3311 |
/*
|
3312 |
* Already an array, done.
|
3313 |
*/
|
3314 |
|
3315 |
return TCL_OK;
|
3316 |
}
|
3317 |
if (TclIsVarArrayElement(varPtr) || !TclIsVarUndefined(varPtr)) {
|
3318 |
/*
|
3319 |
* Either an array element, or a scalar: lose!
|
3320 |
*/
|
3321 |
|
3322 |
VarErrMsg(interp, varName, (char *)NULL, "array set", needArray);
|
3323 |
return TCL_ERROR;
|
3324 |
}
|
3325 |
} else {
|
3326 |
/*
|
3327 |
* Create variable for new array.
|
3328 |
*/
|
3329 |
|
3330 |
varPtr = TclLookupVar(interp, varName, (char *) NULL,
|
3331 |
TCL_LEAVE_ERR_MSG, "set",
|
3332 |
/*createPart1*/ 1, /*createPart2*/ 0, &arrayPtr);
|
3333 |
|
3334 |
/*
|
3335 |
* Still couldn't do it - this can occur if a non-existent
|
3336 |
* namespace was specified
|
3337 |
*/
|
3338 |
if (varPtr == NULL) {
|
3339 |
return TCL_ERROR;
|
3340 |
}
|
3341 |
}
|
3342 |
TclSetVarArray(varPtr);
|
3343 |
TclClearVarUndefined(varPtr);
|
3344 |
varPtr->value.tablePtr =
|
3345 |
(Tcl_HashTable *) ckalloc(sizeof(Tcl_HashTable));
|
3346 |
Tcl_InitHashTable(varPtr->value.tablePtr, TCL_STRING_KEYS);
|
3347 |
return TCL_OK;
|
3348 |
}
|
3349 |
|
3350 |
/*
|
3351 |
*----------------------------------------------------------------------
|
3352 |
*
|
3353 |
* MakeUpvar --
|
3354 |
*
|
3355 |
* This procedure does all of the work of the "global" and "upvar"
|
3356 |
* commands.
|
3357 |
*
|
3358 |
* Results:
|
3359 |
* A standard Tcl completion code. If an error occurs then an
|
3360 |
* error message is left in iPtr->result.
|
3361 |
*
|
3362 |
* Side effects:
|
3363 |
* The variable given by myName is linked to the variable in framePtr
|
3364 |
* given by otherP1 and otherP2, so that references to myName are
|
3365 |
* redirected to the other variable like a symbolic link.
|
3366 |
*
|
3367 |
*----------------------------------------------------------------------
|
3368 |
*/
|
3369 |
|
3370 |
static int
|
3371 |
MakeUpvar(iPtr, framePtr, otherP1, otherP2, otherFlags, myName, myFlags)
|
3372 |
Interp *iPtr; /* Interpreter containing variables. Used
|
3373 |
* for error messages, too. */
|
3374 |
CallFrame *framePtr; /* Call frame containing "other" variable.
|
3375 |
* NULL means use global :: context. */
|
3376 |
char *otherP1, *otherP2; /* Two-part name of variable in framePtr. */
|
3377 |
int otherFlags; /* 0, TCL_GLOBAL_ONLY or TCL_NAMESPACE_ONLY:
|
3378 |
* indicates scope of "other" variable. */
|
3379 |
char *myName; /* Name of variable which will refer to
|
3380 |
* otherP1/otherP2. Must be a scalar. */
|
3381 |
int myFlags; /* 0, TCL_GLOBAL_ONLY or TCL_NAMESPACE_ONLY:
|
3382 |
* indicates scope of myName. */
|
3383 |
{
|
3384 |
Tcl_HashEntry *hPtr;
|
3385 |
Var *otherPtr, *varPtr, *arrayPtr;
|
3386 |
CallFrame *varFramePtr;
|
3387 |
CallFrame *savedFramePtr = NULL; /* Init. to avoid compiler warning. */
|
3388 |
Tcl_HashTable *tablePtr;
|
3389 |
Namespace *nsPtr, *altNsPtr, *dummyNsPtr;
|
3390 |
char *tail;
|
3391 |
int new;
|
3392 |
|
3393 |
/*
|
3394 |
* Find "other" in "framePtr". If not looking up other in just the
|
3395 |
* current namespace, temporarily replace the current var frame
|
3396 |
* pointer in the interpreter in order to use TclLookupVar.
|
3397 |
*/
|
3398 |
|
3399 |
if (!(otherFlags & TCL_NAMESPACE_ONLY)) {
|
3400 |
savedFramePtr = iPtr->varFramePtr;
|
3401 |
iPtr->varFramePtr = framePtr;
|
3402 |
}
|
3403 |
otherPtr = TclLookupVar((Tcl_Interp *) iPtr, otherP1, otherP2,
|
3404 |
(otherFlags | TCL_LEAVE_ERR_MSG), "access",
|
3405 |
/*createPart1*/ 1, /*createPart2*/ 1, &arrayPtr);
|
3406 |
if (!(otherFlags & TCL_NAMESPACE_ONLY)) {
|
3407 |
iPtr->varFramePtr = savedFramePtr;
|
3408 |
}
|
3409 |
if (otherPtr == NULL) {
|
3410 |
return TCL_ERROR;
|
3411 |
}
|
3412 |
|
3413 |
/*
|
3414 |
* Now create a hashtable entry for "myName". Create it as either a
|
3415 |
* namespace variable or as a local variable in a procedure call
|
3416 |
* frame. Interpret myName as a namespace variable if:
|
3417 |
* 1) so requested by a TCL_GLOBAL_ONLY or TCL_NAMESPACE_ONLY flag,
|
3418 |
* 2) there is no active frame (we're at the global :: scope),
|
3419 |
* 3) the active frame was pushed to define the namespace context
|
3420 |
* for a "namespace eval" or "namespace inscope" command,
|
3421 |
* 4) the name has namespace qualifiers ("::"s).
|
3422 |
* If creating myName in the active procedure, look first in the
|
3423 |
* frame's array of compiler-allocated local variables, then in its
|
3424 |
* hashtable for runtime-created local variables. Create that
|
3425 |
* procedure's local variable hashtable if necessary.
|
3426 |
*/
|
3427 |
|
3428 |
varFramePtr = iPtr->varFramePtr;
|
3429 |
if ((myFlags & (TCL_GLOBAL_ONLY | TCL_NAMESPACE_ONLY))
|
3430 |
|| (varFramePtr == NULL)
|
3431 |
|| !varFramePtr->isProcCallFrame
|
3432 |
|| (strstr(myName, "::") != NULL)) {
|
3433 |
TclGetNamespaceForQualName((Tcl_Interp *) iPtr, myName,
|
3434 |
(Namespace *) NULL, myFlags, &nsPtr, &altNsPtr, &dummyNsPtr, &tail);
|
3435 |
|
3436 |
if (nsPtr == NULL) {
|
3437 |
nsPtr = altNsPtr;
|
3438 |
}
|
3439 |
if (nsPtr == NULL) {
|
3440 |
Tcl_AppendResult((Tcl_Interp *) iPtr, "bad variable name \"",
|
3441 |
myName, "\": unknown namespace", (char *) NULL);
|
3442 |
return TCL_ERROR;
|
3443 |
}
|
3444 |
|
3445 |
/*
|
3446 |
* Check that we are not trying to create a namespace var linked to
|
3447 |
* a local variable in a procedure. If we allowed this, the local
|
3448 |
* variable in the shorter-lived procedure frame could go away
|
3449 |
* leaving the namespace var's reference invalid.
|
3450 |
*/
|
3451 |
|
3452 |
if ((otherP2 ? arrayPtr->nsPtr : otherPtr->nsPtr) == NULL) {
|
3453 |
Tcl_AppendResult((Tcl_Interp *) iPtr, "bad variable name \"",
|
3454 |
myName, "\": upvar won't create namespace variable that refers to procedure variable",
|
3455 |
(char *) NULL);
|
3456 |
return TCL_ERROR;
|
3457 |
}
|
3458 |
|
3459 |
hPtr = Tcl_CreateHashEntry(&nsPtr->varTable, tail, &new);
|
3460 |
if (new) {
|
3461 |
varPtr = NewVar();
|
3462 |
Tcl_SetHashValue(hPtr, varPtr);
|
3463 |
varPtr->hPtr = hPtr;
|
3464 |
varPtr->nsPtr = nsPtr;
|
3465 |
} else {
|
3466 |
varPtr = (Var *) Tcl_GetHashValue(hPtr);
|
3467 |
}
|
3468 |
} else { /* look in the call frame */
|
3469 |
Proc *procPtr = varFramePtr->procPtr;
|
3470 |
int localCt = procPtr->numCompiledLocals;
|
3471 |
CompiledLocal *localPtr = procPtr->firstLocalPtr;
|
3472 |
Var *localVarPtr = varFramePtr->compiledLocals;
|
3473 |
int nameLen = strlen(myName);
|
3474 |
int i;
|
3475 |
|
3476 |
varPtr = NULL;
|
3477 |
for (i = 0; i < localCt; i++) {
|
3478 |
if (!TclIsVarTemporary(localPtr)) {
|
3479 |
char *localName = localVarPtr->name;
|
3480 |
if ((myName[0] == localName[0])
|
3481 |
&& (nameLen == localPtr->nameLength)
|
3482 |
&& (strcmp(myName, localName) == 0)) {
|
3483 |
varPtr = localVarPtr;
|
3484 |
new = 0;
|
3485 |
break;
|
3486 |
}
|
3487 |
}
|
3488 |
localVarPtr++;
|
3489 |
localPtr = localPtr->nextPtr;
|
3490 |
}
|
3491 |
if (varPtr == NULL) { /* look in frame's local var hashtable */
|
3492 |
tablePtr = varFramePtr->varTablePtr;
|
3493 |
if (tablePtr == NULL) {
|
3494 |
tablePtr = (Tcl_HashTable *) ckalloc(sizeof(Tcl_HashTable));
|
3495 |
Tcl_InitHashTable(tablePtr, TCL_STRING_KEYS);
|
3496 |
varFramePtr->varTablePtr = tablePtr;
|
3497 |
}
|
3498 |
hPtr = Tcl_CreateHashEntry(tablePtr, myName, &new);
|
3499 |
if (new) {
|
3500 |
varPtr = NewVar();
|
3501 |
Tcl_SetHashValue(hPtr, varPtr);
|
3502 |
varPtr->hPtr = hPtr;
|
3503 |
varPtr->nsPtr = varFramePtr->nsPtr;
|
3504 |
} else {
|
3505 |
varPtr = (Var *) Tcl_GetHashValue(hPtr);
|
3506 |
}
|
3507 |
}
|
3508 |
}
|
3509 |
|
3510 |
if (!new) {
|
3511 |
/*
|
3512 |
* The variable already exists. Make sure this variable "varPtr"
|
3513 |
* isn't the same as "otherPtr" (avoid circular links). Also, if
|
3514 |
* it's not an upvar then it's an error. If it is an upvar, then
|
3515 |
* just disconnect it from the thing it currently refers to.
|
3516 |
*/
|
3517 |
|
3518 |
if (varPtr == otherPtr) {
|
3519 |
Tcl_SetResult((Tcl_Interp *) iPtr,
|
3520 |
"can't upvar from variable to itself", TCL_STATIC);
|
3521 |
return TCL_ERROR;
|
3522 |
}
|
3523 |
if (TclIsVarLink(varPtr)) {
|
3524 |
Var *linkPtr = varPtr->value.linkPtr;
|
3525 |
if (linkPtr == otherPtr) {
|
3526 |
return TCL_OK;
|
3527 |
}
|
3528 |
linkPtr->refCount--;
|
3529 |
if (TclIsVarUndefined(linkPtr)) {
|
3530 |
CleanupVar(linkPtr, (Var *) NULL);
|
3531 |
}
|
3532 |
} else if (!TclIsVarUndefined(varPtr)) {
|
3533 |
Tcl_AppendResult((Tcl_Interp *) iPtr, "variable \"", myName,
|
3534 |
"\" already exists", (char *) NULL);
|
3535 |
return TCL_ERROR;
|
3536 |
} else if (varPtr->tracePtr != NULL) {
|
3537 |
Tcl_AppendResult((Tcl_Interp *) iPtr, "variable \"", myName,
|
3538 |
"\" has traces: can't use for upvar", (char *) NULL);
|
3539 |
return TCL_ERROR;
|
3540 |
}
|
3541 |
}
|
3542 |
TclSetVarLink(varPtr);
|
3543 |
TclClearVarUndefined(varPtr);
|
3544 |
varPtr->value.linkPtr = otherPtr;
|
3545 |
otherPtr->refCount++;
|
3546 |
return TCL_OK;
|
3547 |
}
|
3548 |
|
3549 |
/*
|
3550 |
*----------------------------------------------------------------------
|
3551 |
*
|
3552 |
* Tcl_UpVar --
|
3553 |
*
|
3554 |
* This procedure links one variable to another, just like
|
3555 |
* the "upvar" command.
|
3556 |
*
|
3557 |
* Results:
|
3558 |
* A standard Tcl completion code. If an error occurs then
|
3559 |
* an error message is left in the interp's result.
|
3560 |
*
|
3561 |
* Side effects:
|
3562 |
* The variable in frameName whose name is given by varName becomes
|
3563 |
* accessible under the name localName, so that references to
|
3564 |
* localName are redirected to the other variable like a symbolic
|
3565 |
* link.
|
3566 |
*
|
3567 |
*----------------------------------------------------------------------
|
3568 |
*/
|
3569 |
|
3570 |
int
|
3571 |
Tcl_UpVar(interp, frameName, varName, localName, flags)
|
3572 |
Tcl_Interp *interp; /* Command interpreter in which varName is
|
3573 |
* to be looked up. */
|
3574 |
char *frameName; /* Name of the frame containing the source
|
3575 |
* variable, such as "1" or "#0". */
|
3576 |
char *varName; /* Name of a variable in interp to link to.
|
3577 |
* May be either a scalar name or an
|
3578 |
* element in an array. */
|
3579 |
char *localName; /* Name of link variable. */
|
3580 |
int flags; /* 0, TCL_GLOBAL_ONLY or TCL_NAMESPACE_ONLY:
|
3581 |
* indicates scope of localName. */
|
3582 |
{
|
3583 |
int result;
|
3584 |
CallFrame *framePtr;
|
3585 |
register char *p;
|
3586 |
|
3587 |
result = TclGetFrame(interp, frameName, &framePtr);
|
3588 |
if (result == -1) {
|
3589 |
return TCL_ERROR;
|
3590 |
}
|
3591 |
|
3592 |
/*
|
3593 |
* Figure out whether varName is an array reference, then call
|
3594 |
* MakeUpvar to do all the real work.
|
3595 |
*/
|
3596 |
|
3597 |
for (p = varName; *p != '\0'; p++) {
|
3598 |
if (*p == '(') {
|
3599 |
char *openParen = p;
|
3600 |
do {
|
3601 |
p++;
|
3602 |
} while (*p != '\0');
|
3603 |
p--;
|
3604 |
if (*p != ')') {
|
3605 |
goto scalar;
|
3606 |
}
|
3607 |
*openParen = '\0';
|
3608 |
*p = '\0';
|
3609 |
result = MakeUpvar((Interp *) interp, framePtr, varName,
|
3610 |
openParen+1, 0, localName, flags);
|
3611 |
*openParen = '(';
|
3612 |
*p = ')';
|
3613 |
return result;
|
3614 |
}
|
3615 |
}
|
3616 |
|
3617 |
scalar:
|
3618 |
return MakeUpvar((Interp *) interp, framePtr, varName, (char *) NULL,
|
3619 |
0, localName, flags);
|
3620 |
}
|
3621 |
|
3622 |
/*
|
3623 |
*----------------------------------------------------------------------
|
3624 |
*
|
3625 |
* Tcl_UpVar2 --
|
3626 |
*
|
3627 |
* This procedure links one variable to another, just like
|
3628 |
* the "upvar" command.
|
3629 |
*
|
3630 |
* Results:
|
3631 |
* A standard Tcl completion code. If an error occurs then
|
3632 |
* an error message is left in the interp's result.
|
3633 |
*
|
3634 |
* Side effects:
|
3635 |
* The variable in frameName whose name is given by part1 and
|
3636 |
* part2 becomes accessible under the name localName, so that
|
3637 |
* references to localName are redirected to the other variable
|
3638 |
* like a symbolic link.
|
3639 |
*
|
3640 |
*----------------------------------------------------------------------
|
3641 |
*/
|
3642 |
|
3643 |
int
|
3644 |
Tcl_UpVar2(interp, frameName, part1, part2, localName, flags)
|
3645 |
Tcl_Interp *interp; /* Interpreter containing variables. Used
|
3646 |
* for error messages too. */
|
3647 |
char *frameName; /* Name of the frame containing the source
|
3648 |
* variable, such as "1" or "#0". */
|
3649 |
char *part1, *part2; /* Two parts of source variable name to
|
3650 |
* link to. */
|
3651 |
char *localName; /* Name of link variable. */
|
3652 |
int flags; /* 0, TCL_GLOBAL_ONLY or TCL_NAMESPACE_ONLY:
|
3653 |
* indicates scope of localName. */
|
3654 |
{
|
3655 |
int result;
|
3656 |
CallFrame *framePtr;
|
3657 |
|
3658 |
result = TclGetFrame(interp, frameName, &framePtr);
|
3659 |
if (result == -1) {
|
3660 |
return TCL_ERROR;
|
3661 |
}
|
3662 |
return MakeUpvar((Interp *) interp, framePtr, part1, part2, 0,
|
3663 |
localName, flags);
|
3664 |
}
|
3665 |
|
3666 |
/*
|
3667 |
*----------------------------------------------------------------------
|
3668 |
*
|
3669 |
* Tcl_GetVariableFullName --
|
3670 |
*
|
3671 |
* Given a Tcl_Var token returned by Tcl_FindNamespaceVar, this
|
3672 |
* procedure appends to an object the namespace variable's full
|
3673 |
* name, qualified by a sequence of parent namespace names.
|
3674 |
*
|
3675 |
* Results:
|
3676 |
* None.
|
3677 |
*
|
3678 |
* Side effects:
|
3679 |
* The variable's fully-qualified name is appended to the string
|
3680 |
* representation of objPtr.
|
3681 |
*
|
3682 |
*----------------------------------------------------------------------
|
3683 |
*/
|
3684 |
|
3685 |
void
|
3686 |
Tcl_GetVariableFullName(interp, variable, objPtr)
|
3687 |
Tcl_Interp *interp; /* Interpreter containing the variable. */
|
3688 |
Tcl_Var variable; /* Token for the variable returned by a
|
3689 |
* previous call to Tcl_FindNamespaceVar. */
|
3690 |
Tcl_Obj *objPtr; /* Points to the object onto which the
|
3691 |
* variable's full name is appended. */
|
3692 |
{
|
3693 |
Interp *iPtr = (Interp *) interp;
|
3694 |
register Var *varPtr = (Var *) variable;
|
3695 |
char *name;
|
3696 |
|
3697 |
/*
|
3698 |
* Add the full name of the containing namespace (if any), followed by
|
3699 |
* the "::" separator, then the variable name.
|
3700 |
*/
|
3701 |
|
3702 |
if (varPtr != NULL) {
|
3703 |
if (!TclIsVarArrayElement(varPtr)) {
|
3704 |
if (varPtr->nsPtr != NULL) {
|
3705 |
Tcl_AppendToObj(objPtr, varPtr->nsPtr->fullName, -1);
|
3706 |
if (varPtr->nsPtr != iPtr->globalNsPtr) {
|
3707 |
Tcl_AppendToObj(objPtr, "::", 2);
|
3708 |
}
|
3709 |
}
|
3710 |
if (varPtr->name != NULL) {
|
3711 |
Tcl_AppendToObj(objPtr, varPtr->name, -1);
|
3712 |
} else if (varPtr->hPtr != NULL) {
|
3713 |
name = Tcl_GetHashKey(varPtr->hPtr->tablePtr, varPtr->hPtr);
|
3714 |
Tcl_AppendToObj(objPtr, name, -1);
|
3715 |
}
|
3716 |
}
|
3717 |
}
|
3718 |
}
|
3719 |
|
3720 |
/*
|
3721 |
*----------------------------------------------------------------------
|
3722 |
*
|
3723 |
* Tcl_GlobalObjCmd --
|
3724 |
*
|
3725 |
* This object-based procedure is invoked to process the "global" Tcl
|
3726 |
* command. See the user documentation for details on what it does.
|
3727 |
*
|
3728 |
* Results:
|
3729 |
* A standard Tcl object result value.
|
3730 |
*
|
3731 |
* Side effects:
|
3732 |
* See the user documentation.
|
3733 |
*
|
3734 |
*----------------------------------------------------------------------
|
3735 |
*/
|
3736 |
|
3737 |
int
|
3738 |
Tcl_GlobalObjCmd(dummy, interp, objc, objv)
|
3739 |
ClientData dummy; /* Not used. */
|
3740 |
Tcl_Interp *interp; /* Current interpreter. */
|
3741 |
int objc; /* Number of arguments. */
|
3742 |
Tcl_Obj *CONST objv[]; /* Argument objects. */
|
3743 |
{
|
3744 |
Interp *iPtr = (Interp *) interp;
|
3745 |
register Tcl_Obj *objPtr;
|
3746 |
char *varName;
|
3747 |
register char *tail;
|
3748 |
int result, i;
|
3749 |
|
3750 |
if (objc < 2) {
|
3751 |
Tcl_WrongNumArgs(interp, 1, objv, "varName ?varName ...?");
|
3752 |
return TCL_ERROR;
|
3753 |
}
|
3754 |
|
3755 |
/*
|
3756 |
* If we are not executing inside a Tcl procedure, just return.
|
3757 |
*/
|
3758 |
|
3759 |
if ((iPtr->varFramePtr == NULL)
|
3760 |
|| !iPtr->varFramePtr->isProcCallFrame) {
|
3761 |
return TCL_OK;
|
3762 |
}
|
3763 |
|
3764 |
for (i = 1; i < objc; i++) {
|
3765 |
/*
|
3766 |
* Make a local variable linked to its counterpart in the global ::
|
3767 |
* namespace.
|
3768 |
*/
|
3769 |
|
3770 |
objPtr = objv[i];
|
3771 |
varName = TclGetString(objPtr);
|
3772 |
|
3773 |
/*
|
3774 |
* The variable name might have a scope qualifier, but the name for
|
3775 |
* the local "link" variable must be the simple name at the tail.
|
3776 |
*/
|
3777 |
|
3778 |
for (tail = varName; *tail != '\0'; tail++) {
|
3779 |
/* empty body */
|
3780 |
}
|
3781 |
while ((tail > varName) && ((*tail != ':') || (*(tail-1) != ':'))) {
|
3782 |
tail--;
|
3783 |
}
|
3784 |
if (*tail == ':') {
|
3785 |
tail++;
|
3786 |
}
|
3787 |
|
3788 |
/*
|
3789 |
* Link to the variable "varName" in the global :: namespace.
|
3790 |
*/
|
3791 |
|
3792 |
result = MakeUpvar(iPtr, (CallFrame *) NULL,
|
3793 |
varName, (char *) NULL, /*otherFlags*/ TCL_GLOBAL_ONLY,
|
3794 |
/*myName*/ tail, /*myFlags*/ 0);
|
3795 |
if (result != TCL_OK) {
|
3796 |
return result;
|
3797 |
}
|
3798 |
}
|
3799 |
return TCL_OK;
|
3800 |
}
|
3801 |
|
3802 |
/*
|
3803 |
*----------------------------------------------------------------------
|
3804 |
*
|
3805 |
* Tcl_VariableObjCmd --
|
3806 |
*
|
3807 |
* Invoked to implement the "variable" command that creates one or more
|
3808 |
* global variables. Handles the following syntax:
|
3809 |
*
|
3810 |
* variable ?name value...? name ?value?
|
3811 |
*
|
3812 |
* One or more variables can be created. The variables are initialized
|
3813 |
* with the specified values. The value for the last variable is
|
3814 |
* optional.
|
3815 |
*
|
3816 |
* If the variable does not exist, it is created and given the optional
|
3817 |
* value. If it already exists, it is simply set to the optional
|
3818 |
* value. Normally, "name" is an unqualified name, so it is created in
|
3819 |
* the current namespace. If it includes namespace qualifiers, it can
|
3820 |
* be created in another namespace.
|
3821 |
*
|
3822 |
* If the variable command is executed inside a Tcl procedure, it
|
3823 |
* creates a local variable linked to the newly-created namespace
|
3824 |
* variable.
|
3825 |
*
|
3826 |
* Results:
|
3827 |
* Returns TCL_OK if the variable is found or created. Returns
|
3828 |
* TCL_ERROR if anything goes wrong.
|
3829 |
*
|
3830 |
* Side effects:
|
3831 |
* If anything goes wrong, this procedure returns an error message
|
3832 |
* as the result in the interpreter's result object.
|
3833 |
*
|
3834 |
*----------------------------------------------------------------------
|
3835 |
*/
|
3836 |
|
3837 |
int
|
3838 |
Tcl_VariableObjCmd(dummy, interp, objc, objv)
|
3839 |
ClientData dummy; /* Not used. */
|
3840 |
Tcl_Interp *interp; /* Current interpreter. */
|
3841 |
int objc; /* Number of arguments. */
|
3842 |
Tcl_Obj *CONST objv[]; /* Argument objects. */
|
3843 |
{
|
3844 |
Interp *iPtr = (Interp *) interp;
|
3845 |
char *varName, *tail, *cp;
|
3846 |
Var *varPtr, *arrayPtr;
|
3847 |
Tcl_Obj *varValuePtr;
|
3848 |
int i, result;
|
3849 |
|
3850 |
for (i = 1; i < objc; i = i+2) {
|
3851 |
/*
|
3852 |
* Look up each variable in the current namespace context, creating
|
3853 |
* it if necessary.
|
3854 |
*/
|
3855 |
|
3856 |
varName = TclGetString(objv[i]);
|
3857 |
varPtr = TclLookupVar(interp, varName, (char *) NULL,
|
3858 |
(TCL_NAMESPACE_ONLY | TCL_LEAVE_ERR_MSG), "define",
|
3859 |
/*createPart1*/ 1, /*createPart2*/ 0, &arrayPtr);
|
3860 |
|
3861 |
if (arrayPtr != NULL) {
|
3862 |
/*
|
3863 |
* Variable cannot be an element in an array. If arrayPtr is
|
3864 |
* non-null, it is, so throw up an error and return.
|
3865 |
*/
|
3866 |
VarErrMsg(interp, varName, NULL, "define", isArrayElement);
|
3867 |
return TCL_ERROR;
|
3868 |
}
|
3869 |
|
3870 |
if (varPtr == NULL) {
|
3871 |
return TCL_ERROR;
|
3872 |
}
|
3873 |
|
3874 |
/*
|
3875 |
* Mark the variable as a namespace variable and increment its
|
3876 |
* reference count so that it will persist until its namespace is
|
3877 |
* destroyed or until the variable is unset.
|
3878 |
*/
|
3879 |
|
3880 |
if (!(varPtr->flags & VAR_NAMESPACE_VAR)) {
|
3881 |
varPtr->flags |= VAR_NAMESPACE_VAR;
|
3882 |
varPtr->refCount++;
|
3883 |
}
|
3884 |
|
3885 |
/*
|
3886 |
* If a value was specified, set the variable to that value.
|
3887 |
* Otherwise, if the variable is new, leave it undefined.
|
3888 |
* (If the variable already exists and no value was specified,
|
3889 |
* leave its value unchanged; just create the local link if
|
3890 |
* we're in a Tcl procedure).
|
3891 |
*/
|
3892 |
|
3893 |
if (i+1 < objc) { /* a value was specified */
|
3894 |
varValuePtr = Tcl_ObjSetVar2(interp, objv[i], NULL, objv[i+1],
|
3895 |
(TCL_NAMESPACE_ONLY | TCL_LEAVE_ERR_MSG));
|
3896 |
if (varValuePtr == NULL) {
|
3897 |
return TCL_ERROR;
|
3898 |
}
|
3899 |
}
|
3900 |
|
3901 |
/*
|
3902 |
* If we are executing inside a Tcl procedure, create a local
|
3903 |
* variable linked to the new namespace variable "varName".
|
3904 |
*/
|
3905 |
|
3906 |
if ((iPtr->varFramePtr != NULL)
|
3907 |
&& iPtr->varFramePtr->isProcCallFrame) {
|
3908 |
/*
|
3909 |
* varName might have a scope qualifier, but the name for the
|
3910 |
* local "link" variable must be the simple name at the tail.
|
3911 |
*
|
3912 |
* Locate tail in one pass: drop any prefix after two *or more*
|
3913 |
* consecutive ":" characters).
|
3914 |
*/
|
3915 |
|
3916 |
for (tail = cp = varName; *cp != '\0'; ) {
|
3917 |
if (*cp++ == ':') {
|
3918 |
while (*cp == ':') {
|
3919 |
tail = ++cp;
|
3920 |
}
|
3921 |
}
|
3922 |
}
|
3923 |
|
3924 |
/*
|
3925 |
* Create a local link "tail" to the variable "varName" in the
|
3926 |
* current namespace.
|
3927 |
*/
|
3928 |
|
3929 |
result = MakeUpvar(iPtr, (CallFrame *) NULL,
|
3930 |
/*otherP1*/ varName, /*otherP2*/ (char *) NULL,
|
3931 |
/*otherFlags*/ TCL_NAMESPACE_ONLY,
|
3932 |
/*myName*/ tail, /*myFlags*/ 0);
|
3933 |
if (result != TCL_OK) {
|
3934 |
return result;
|
3935 |
}
|
3936 |
}
|
3937 |
}
|
3938 |
return TCL_OK;
|
3939 |
}
|
3940 |
|
3941 |
/*
|
3942 |
*----------------------------------------------------------------------
|
3943 |
*
|
3944 |
* Tcl_UpvarObjCmd --
|
3945 |
*
|
3946 |
* This object-based procedure is invoked to process the "upvar"
|
3947 |
* Tcl command. See the user documentation for details on what it does.
|
3948 |
*
|
3949 |
* Results:
|
3950 |
* A standard Tcl object result value.
|
3951 |
*
|
3952 |
* Side effects:
|
3953 |
* See the user documentation.
|
3954 |
*
|
3955 |
*----------------------------------------------------------------------
|
3956 |
*/
|
3957 |
|
3958 |
/* ARGSUSED */
|
3959 |
int
|
3960 |
Tcl_UpvarObjCmd(dummy, interp, objc, objv)
|
3961 |
ClientData dummy; /* Not used. */
|
3962 |
Tcl_Interp *interp; /* Current interpreter. */
|
3963 |
int objc; /* Number of arguments. */
|
3964 |
Tcl_Obj *CONST objv[]; /* Argument objects. */
|
3965 |
{
|
3966 |
register Interp *iPtr = (Interp *) interp;
|
3967 |
CallFrame *framePtr;
|
3968 |
char *frameSpec, *otherVarName, *myVarName;
|
3969 |
register char *p;
|
3970 |
int result;
|
3971 |
|
3972 |
if (objc < 3) {
|
3973 |
upvarSyntax:
|
3974 |
Tcl_WrongNumArgs(interp, 1, objv,
|
3975 |
"?level? otherVar localVar ?otherVar localVar ...?");
|
3976 |
return TCL_ERROR;
|
3977 |
}
|
3978 |
|
3979 |
/*
|
3980 |
* Find the call frame containing each of the "other variables" to be
|
3981 |
* linked to.
|
3982 |
*/
|
3983 |
|
3984 |
frameSpec = TclGetString(objv[1]);
|
3985 |
result = TclGetFrame(interp, frameSpec, &framePtr);
|
3986 |
if (result == -1) {
|
3987 |
return TCL_ERROR;
|
3988 |
}
|
3989 |
objc -= result+1;
|
3990 |
if ((objc & 1) != 0) {
|
3991 |
goto upvarSyntax;
|
3992 |
}
|
3993 |
objv += result+1;
|
3994 |
|
3995 |
/*
|
3996 |
* Iterate over each (other variable, local variable) pair.
|
3997 |
* Divide the other variable name into two parts, then call
|
3998 |
* MakeUpvar to do all the work of linking it to the local variable.
|
3999 |
*/
|
4000 |
|
4001 |
for ( ; objc > 0; objc -= 2, objv += 2) {
|
4002 |
myVarName = TclGetString(objv[1]);
|
4003 |
otherVarName = TclGetString(objv[0]);
|
4004 |
for (p = otherVarName; *p != 0; p++) {
|
4005 |
if (*p == '(') {
|
4006 |
char *openParen = p;
|
4007 |
|
4008 |
do {
|
4009 |
p++;
|
4010 |
} while (*p != '\0');
|
4011 |
p--;
|
4012 |
if (*p != ')') {
|
4013 |
goto scalar;
|
4014 |
}
|
4015 |
*openParen = '\0';
|
4016 |
*p = '\0';
|
4017 |
result = MakeUpvar(iPtr, framePtr,
|
4018 |
otherVarName, openParen+1, /*otherFlags*/ 0,
|
4019 |
myVarName, /*flags*/ 0);
|
4020 |
*openParen = '(';
|
4021 |
*p = ')';
|
4022 |
goto checkResult;
|
4023 |
}
|
4024 |
}
|
4025 |
scalar:
|
4026 |
result = MakeUpvar(iPtr, framePtr, otherVarName, (char *) NULL, 0,
|
4027 |
myVarName, /*flags*/ 0);
|
4028 |
|
4029 |
checkResult:
|
4030 |
if (result != TCL_OK) {
|
4031 |
return TCL_ERROR;
|
4032 |
}
|
4033 |
}
|
4034 |
return TCL_OK;
|
4035 |
}
|
4036 |
|
4037 |
/*
|
4038 |
*----------------------------------------------------------------------
|
4039 |
*
|
4040 |
* CallTraces --
|
4041 |
*
|
4042 |
* This procedure is invoked to find and invoke relevant
|
4043 |
* trace procedures associated with a particular operation on
|
4044 |
* a variable. This procedure invokes traces both on the
|
4045 |
* variable and on its containing array (where relevant).
|
4046 |
*
|
4047 |
* Results:
|
4048 |
* The return value is NULL if no trace procedures were invoked, or
|
4049 |
* if all the invoked trace procedures returned successfully.
|
4050 |
* The return value is non-NULL if a trace procedure returned an
|
4051 |
* error (in this case no more trace procedures were invoked after
|
4052 |
* the error was returned). In this case the return value is a
|
4053 |
* pointer to a static string describing the error.
|
4054 |
*
|
4055 |
* Side effects:
|
4056 |
* Almost anything can happen, depending on trace; this procedure
|
4057 |
* itself doesn't have any side effects.
|
4058 |
*
|
4059 |
*----------------------------------------------------------------------
|
4060 |
*/
|
4061 |
|
4062 |
static char *
|
4063 |
CallTraces(iPtr, arrayPtr, varPtr, part1, part2, flags)
|
4064 |
Interp *iPtr; /* Interpreter containing variable. */
|
4065 |
register Var *arrayPtr; /* Pointer to array variable that contains
|
4066 |
* the variable, or NULL if the variable
|
4067 |
* isn't an element of an array. */
|
4068 |
Var *varPtr; /* Variable whose traces are to be
|
4069 |
* invoked. */
|
4070 |
char *part1, *part2; /* Variable's two-part name. */
|
4071 |
int flags; /* Flags passed to trace procedures:
|
4072 |
* indicates what's happening to variable,
|
4073 |
* plus other stuff like TCL_GLOBAL_ONLY,
|
4074 |
* TCL_NAMESPACE_ONLY, and
|
4075 |
* TCL_INTERP_DESTROYED. */
|
4076 |
{
|
4077 |
register VarTrace *tracePtr;
|
4078 |
ActiveVarTrace active;
|
4079 |
char *result, *openParen, *p;
|
4080 |
Tcl_DString nameCopy;
|
4081 |
int copiedName;
|
4082 |
|
4083 |
/*
|
4084 |
* If there are already similar trace procedures active for the
|
4085 |
* variable, don't call them again.
|
4086 |
*/
|
4087 |
|
4088 |
if (varPtr->flags & VAR_TRACE_ACTIVE) {
|
4089 |
return NULL;
|
4090 |
}
|
4091 |
varPtr->flags |= VAR_TRACE_ACTIVE;
|
4092 |
varPtr->refCount++;
|
4093 |
|
4094 |
/*
|
4095 |
* If the variable name hasn't been parsed into array name and
|
4096 |
* element, do it here. If there really is an array element,
|
4097 |
* make a copy of the original name so that NULLs can be
|
4098 |
* inserted into it to separate the names (can't modify the name
|
4099 |
* string in place, because the string might get used by the
|
4100 |
* callbacks we invoke).
|
4101 |
*/
|
4102 |
|
4103 |
copiedName = 0;
|
4104 |
if (part2 == NULL) {
|
4105 |
for (p = part1; *p ; p++) {
|
4106 |
if (*p == '(') {
|
4107 |
openParen = p;
|
4108 |
do {
|
4109 |
p++;
|
4110 |
} while (*p != '\0');
|
4111 |
p--;
|
4112 |
if (*p == ')') {
|
4113 |
Tcl_DStringInit(&nameCopy);
|
4114 |
Tcl_DStringAppend(&nameCopy, part1, (p-part1));
|
4115 |
part2 = Tcl_DStringValue(&nameCopy)
|
4116 |
+ (openParen + 1 - part1);
|
4117 |
part2[-1] = 0;
|
4118 |
part1 = Tcl_DStringValue(&nameCopy);
|
4119 |
copiedName = 1;
|
4120 |
}
|
4121 |
break;
|
4122 |
}
|
4123 |
}
|
4124 |
}
|
4125 |
|
4126 |
/*
|
4127 |
* Invoke traces on the array containing the variable, if relevant.
|
4128 |
*/
|
4129 |
|
4130 |
result = NULL;
|
4131 |
active.nextPtr = iPtr->activeTracePtr;
|
4132 |
iPtr->activeTracePtr = &active;
|
4133 |
if (arrayPtr != NULL) {
|
4134 |
arrayPtr->refCount++;
|
4135 |
active.varPtr = arrayPtr;
|
4136 |
for (tracePtr = arrayPtr->tracePtr; tracePtr != NULL;
|
4137 |
tracePtr = active.nextTracePtr) {
|
4138 |
active.nextTracePtr = tracePtr->nextPtr;
|
4139 |
if (!(tracePtr->flags & flags)) {
|
4140 |
continue;
|
4141 |
}
|
4142 |
result = (*tracePtr->traceProc)(tracePtr->clientData,
|
4143 |
(Tcl_Interp *) iPtr, part1, part2, flags);
|
4144 |
if (result != NULL) {
|
4145 |
if (flags & TCL_TRACE_UNSETS) {
|
4146 |
result = NULL;
|
4147 |
} else {
|
4148 |
goto done;
|
4149 |
}
|
4150 |
}
|
4151 |
}
|
4152 |
}
|
4153 |
|
4154 |
/*
|
4155 |
* Invoke traces on the variable itself.
|
4156 |
*/
|
4157 |
|
4158 |
if (flags & TCL_TRACE_UNSETS) {
|
4159 |
flags |= TCL_TRACE_DESTROYED;
|
4160 |
}
|
4161 |
active.varPtr = varPtr;
|
4162 |
for (tracePtr = varPtr->tracePtr; tracePtr != NULL;
|
4163 |
tracePtr = active.nextTracePtr) {
|
4164 |
active.nextTracePtr = tracePtr->nextPtr;
|
4165 |
if (!(tracePtr->flags & flags)) {
|
4166 |
continue;
|
4167 |
}
|
4168 |
result = (*tracePtr->traceProc)(tracePtr->clientData,
|
4169 |
(Tcl_Interp *) iPtr, part1, part2, flags);
|
4170 |
if (result != NULL) {
|
4171 |
if (flags & TCL_TRACE_UNSETS) {
|
4172 |
result = NULL;
|
4173 |
} else {
|
4174 |
goto done;
|
4175 |
}
|
4176 |
}
|
4177 |
}
|
4178 |
|
4179 |
/*
|
4180 |
* Restore the variable's flags, remove the record of our active
|
4181 |
* traces, and then return.
|
4182 |
*/
|
4183 |
|
4184 |
done:
|
4185 |
if (arrayPtr != NULL) {
|
4186 |
arrayPtr->refCount--;
|
4187 |
}
|
4188 |
if (copiedName) {
|
4189 |
Tcl_DStringFree(&nameCopy);
|
4190 |
}
|
4191 |
varPtr->flags &= ~VAR_TRACE_ACTIVE;
|
4192 |
varPtr->refCount--;
|
4193 |
iPtr->activeTracePtr = active.nextPtr;
|
4194 |
return result;
|
4195 |
}
|
4196 |
|
4197 |
/*
|
4198 |
*----------------------------------------------------------------------
|
4199 |
*
|
4200 |
* NewVar --
|
4201 |
*
|
4202 |
* Create a new heap-allocated variable that will eventually be
|
4203 |
* entered into a hashtable.
|
4204 |
*
|
4205 |
* Results:
|
4206 |
* The return value is a pointer to the new variable structure. It is
|
4207 |
* marked as a scalar variable (and not a link or array variable). Its
|
4208 |
* value initially is NULL. The variable is not part of any hash table
|
4209 |
* yet. Since it will be in a hashtable and not in a call frame, its
|
4210 |
* name field is set NULL. It is initially marked as undefined.
|
4211 |
*
|
4212 |
* Side effects:
|
4213 |
* Storage gets allocated.
|
4214 |
*
|
4215 |
*----------------------------------------------------------------------
|
4216 |
*/
|
4217 |
|
4218 |
static Var *
|
4219 |
NewVar()
|
4220 |
{
|
4221 |
register Var *varPtr;
|
4222 |
|
4223 |
varPtr = (Var *) ckalloc(sizeof(Var));
|
4224 |
varPtr->value.objPtr = NULL;
|
4225 |
varPtr->name = NULL;
|
4226 |
varPtr->nsPtr = NULL;
|
4227 |
varPtr->hPtr = NULL;
|
4228 |
varPtr->refCount = 0;
|
4229 |
varPtr->tracePtr = NULL;
|
4230 |
varPtr->searchPtr = NULL;
|
4231 |
varPtr->flags = (VAR_SCALAR | VAR_UNDEFINED | VAR_IN_HASHTABLE);
|
4232 |
return varPtr;
|
4233 |
}
|
4234 |
|
4235 |
/*
|
4236 |
*----------------------------------------------------------------------
|
4237 |
*
|
4238 |
* ParseSearchId --
|
4239 |
*
|
4240 |
* This procedure translates from a string to a pointer to an
|
4241 |
* active array search (if there is one that matches the string).
|
4242 |
*
|
4243 |
* Results:
|
4244 |
* The return value is a pointer to the array search indicated
|
4245 |
* by string, or NULL if there isn't one. If NULL is returned,
|
4246 |
* the interp's result contains an error message.
|
4247 |
*
|
4248 |
* Side effects:
|
4249 |
* None.
|
4250 |
*
|
4251 |
*----------------------------------------------------------------------
|
4252 |
*/
|
4253 |
|
4254 |
static ArraySearch *
|
4255 |
ParseSearchId(interp, varPtr, varName, string)
|
4256 |
Tcl_Interp *interp; /* Interpreter containing variable. */
|
4257 |
Var *varPtr; /* Array variable search is for. */
|
4258 |
char *varName; /* Name of array variable that search is
|
4259 |
* supposed to be for. */
|
4260 |
char *string; /* String containing id of search. Must have
|
4261 |
* form "search-num-var" where "num" is a
|
4262 |
* decimal number and "var" is a variable
|
4263 |
* name. */
|
4264 |
{
|
4265 |
char *end;
|
4266 |
int id;
|
4267 |
ArraySearch *searchPtr;
|
4268 |
|
4269 |
/*
|
4270 |
* Parse the id into the three parts separated by dashes.
|
4271 |
*/
|
4272 |
|
4273 |
if ((string[0] != 's') || (string[1] != '-')) {
|
4274 |
syntax:
|
4275 |
Tcl_AppendResult(interp, "illegal search identifier \"", string,
|
4276 |
"\"", (char *) NULL);
|
4277 |
return NULL;
|
4278 |
}
|
4279 |
id = strtoul(string+2, &end, 10);
|
4280 |
if ((end == (string+2)) || (*end != '-')) {
|
4281 |
goto syntax;
|
4282 |
}
|
4283 |
if (strcmp(end+1, varName) != 0) {
|
4284 |
Tcl_AppendResult(interp, "search identifier \"", string,
|
4285 |
"\" isn't for variable \"", varName, "\"", (char *) NULL);
|
4286 |
return NULL;
|
4287 |
}
|
4288 |
|
4289 |
/*
|
4290 |
* Search through the list of active searches on the interpreter
|
4291 |
* to see if the desired one exists.
|
4292 |
*/
|
4293 |
|
4294 |
for (searchPtr = varPtr->searchPtr; searchPtr != NULL;
|
4295 |
searchPtr = searchPtr->nextPtr) {
|
4296 |
if (searchPtr->id == id) {
|
4297 |
return searchPtr;
|
4298 |
}
|
4299 |
}
|
4300 |
Tcl_AppendResult(interp, "couldn't find search \"", string, "\"",
|
4301 |
(char *) NULL);
|
4302 |
return NULL;
|
4303 |
}
|
4304 |
|
4305 |
/*
|
4306 |
*----------------------------------------------------------------------
|
4307 |
*
|
4308 |
* DeleteSearches --
|
4309 |
*
|
4310 |
* This procedure is called to free up all of the searches
|
4311 |
* associated with an array variable.
|
4312 |
*
|
4313 |
* Results:
|
4314 |
* None.
|
4315 |
*
|
4316 |
* Side effects:
|
4317 |
* Memory is released to the storage allocator.
|
4318 |
*
|
4319 |
*----------------------------------------------------------------------
|
4320 |
*/
|
4321 |
|
4322 |
static void
|
4323 |
DeleteSearches(arrayVarPtr)
|
4324 |
register Var *arrayVarPtr; /* Variable whose searches are
|
4325 |
* to be deleted. */
|
4326 |
{
|
4327 |
ArraySearch *searchPtr;
|
4328 |
|
4329 |
while (arrayVarPtr->searchPtr != NULL) {
|
4330 |
searchPtr = arrayVarPtr->searchPtr;
|
4331 |
arrayVarPtr->searchPtr = searchPtr->nextPtr;
|
4332 |
ckfree((char *) searchPtr);
|
4333 |
}
|
4334 |
}
|
4335 |
|
4336 |
/*
|
4337 |
*----------------------------------------------------------------------
|
4338 |
*
|
4339 |
* TclDeleteVars --
|
4340 |
*
|
4341 |
* This procedure is called to recycle all the storage space
|
4342 |
* associated with a table of variables. For this procedure
|
4343 |
* to work correctly, it must not be possible for any of the
|
4344 |
* variables in the table to be accessed from Tcl commands
|
4345 |
* (e.g. from trace procedures).
|
4346 |
*
|
4347 |
* Results:
|
4348 |
* None.
|
4349 |
*
|
4350 |
* Side effects:
|
4351 |
* Variables are deleted and trace procedures are invoked, if
|
4352 |
* any are declared.
|
4353 |
*
|
4354 |
*----------------------------------------------------------------------
|
4355 |
*/
|
4356 |
|
4357 |
void
|
4358 |
TclDeleteVars(iPtr, tablePtr)
|
4359 |
Interp *iPtr; /* Interpreter to which variables belong. */
|
4360 |
Tcl_HashTable *tablePtr; /* Hash table containing variables to
|
4361 |
* delete. */
|
4362 |
{
|
4363 |
Tcl_Interp *interp = (Tcl_Interp *) iPtr;
|
4364 |
Tcl_HashSearch search;
|
4365 |
Tcl_HashEntry *hPtr;
|
4366 |
register Var *varPtr;
|
4367 |
Var *linkPtr;
|
4368 |
int flags;
|
4369 |
ActiveVarTrace *activePtr;
|
4370 |
Tcl_Obj *objPtr;
|
4371 |
Namespace *currNsPtr = (Namespace *) Tcl_GetCurrentNamespace(interp);
|
4372 |
|
4373 |
/*
|
4374 |
* Determine what flags to pass to the trace callback procedures.
|
4375 |
*/
|
4376 |
|
4377 |
flags = TCL_TRACE_UNSETS;
|
4378 |
if (tablePtr == &iPtr->globalNsPtr->varTable) {
|
4379 |
flags |= (TCL_INTERP_DESTROYED | TCL_GLOBAL_ONLY);
|
4380 |
} else if (tablePtr == &currNsPtr->varTable) {
|
4381 |
flags |= TCL_NAMESPACE_ONLY;
|
4382 |
}
|
4383 |
|
4384 |
for (hPtr = Tcl_FirstHashEntry(tablePtr, &search); hPtr != NULL;
|
4385 |
hPtr = Tcl_NextHashEntry(&search)) {
|
4386 |
varPtr = (Var *) Tcl_GetHashValue(hPtr);
|
4387 |
|
4388 |
/*
|
4389 |
* For global/upvar variables referenced in procedures, decrement
|
4390 |
* the reference count on the variable referred to, and free
|
4391 |
* the referenced variable if it's no longer needed. Don't delete
|
4392 |
* the hash entry for the other variable if it's in the same table
|
4393 |
* as us: this will happen automatically later on.
|
4394 |
*/
|
4395 |
|
4396 |
if (TclIsVarLink(varPtr)) {
|
4397 |
linkPtr = varPtr->value.linkPtr;
|
4398 |
linkPtr->refCount--;
|
4399 |
if ((linkPtr->refCount == 0) && TclIsVarUndefined(linkPtr)
|
4400 |
&& (linkPtr->tracePtr == NULL)
|
4401 |
&& (linkPtr->flags & VAR_IN_HASHTABLE)) {
|
4402 |
if (linkPtr->hPtr == NULL) {
|
4403 |
ckfree((char *) linkPtr);
|
4404 |
} else if (linkPtr->hPtr->tablePtr != tablePtr) {
|
4405 |
Tcl_DeleteHashEntry(linkPtr->hPtr);
|
4406 |
ckfree((char *) linkPtr);
|
4407 |
}
|
4408 |
}
|
4409 |
}
|
4410 |
|
4411 |
/*
|
4412 |
* Invoke traces on the variable that is being deleted, then
|
4413 |
* free up the variable's space (no need to free the hash entry
|
4414 |
* here, unless we're dealing with a global variable: the
|
4415 |
* hash entries will be deleted automatically when the whole
|
4416 |
* table is deleted). Note that we give CallTraces the variable's
|
4417 |
* fully-qualified name so that any called trace procedures can
|
4418 |
* refer to these variables being deleted.
|
4419 |
*/
|
4420 |
|
4421 |
if (varPtr->tracePtr != NULL) {
|
4422 |
objPtr = Tcl_NewObj();
|
4423 |
Tcl_IncrRefCount(objPtr); /* until done with traces */
|
4424 |
Tcl_GetVariableFullName(interp, (Tcl_Var) varPtr, objPtr);
|
4425 |
(void) CallTraces(iPtr, (Var *) NULL, varPtr,
|
4426 |
Tcl_GetString(objPtr), (char *) NULL, flags);
|
4427 |
Tcl_DecrRefCount(objPtr); /* free no longer needed obj */
|
4428 |
|
4429 |
while (varPtr->tracePtr != NULL) {
|
4430 |
VarTrace *tracePtr = varPtr->tracePtr;
|
4431 |
varPtr->tracePtr = tracePtr->nextPtr;
|
4432 |
ckfree((char *) tracePtr);
|
4433 |
}
|
4434 |
for (activePtr = iPtr->activeTracePtr; activePtr != NULL;
|
4435 |
activePtr = activePtr->nextPtr) {
|
4436 |
if (activePtr->varPtr == varPtr) {
|
4437 |
activePtr->nextTracePtr = NULL;
|
4438 |
}
|
4439 |
}
|
4440 |
}
|
4441 |
|
4442 |
if (TclIsVarArray(varPtr)) {
|
4443 |
DeleteArray(iPtr, Tcl_GetHashKey(tablePtr, hPtr), varPtr,
|
4444 |
flags);
|
4445 |
varPtr->value.tablePtr = NULL;
|
4446 |
}
|
4447 |
if (TclIsVarScalar(varPtr) && (varPtr->value.objPtr != NULL)) {
|
4448 |
objPtr = varPtr->value.objPtr;
|
4449 |
TclDecrRefCount(objPtr);
|
4450 |
varPtr->value.objPtr = NULL;
|
4451 |
}
|
4452 |
varPtr->hPtr = NULL;
|
4453 |
varPtr->tracePtr = NULL;
|
4454 |
TclSetVarUndefined(varPtr);
|
4455 |
TclSetVarScalar(varPtr);
|
4456 |
|
4457 |
/*
|
4458 |
* If the variable was a namespace variable, decrement its
|
4459 |
* reference count. We are in the process of destroying its
|
4460 |
* namespace so that namespace will no longer "refer" to the
|
4461 |
* variable.
|
4462 |
*/
|
4463 |
|
4464 |
if (varPtr->flags & VAR_NAMESPACE_VAR) {
|
4465 |
varPtr->flags &= ~VAR_NAMESPACE_VAR;
|
4466 |
varPtr->refCount--;
|
4467 |
}
|
4468 |
|
4469 |
/*
|
4470 |
* Recycle the variable's memory space if there aren't any upvar's
|
4471 |
* pointing to it. If there are upvars to this variable, then the
|
4472 |
* variable will get freed when the last upvar goes away.
|
4473 |
*/
|
4474 |
|
4475 |
if (varPtr->refCount == 0) {
|
4476 |
ckfree((char *) varPtr); /* this Var must be VAR_IN_HASHTABLE */
|
4477 |
}
|
4478 |
}
|
4479 |
Tcl_DeleteHashTable(tablePtr);
|
4480 |
}
|
4481 |
|
4482 |
/*
|
4483 |
*----------------------------------------------------------------------
|
4484 |
*
|
4485 |
* TclDeleteCompiledLocalVars --
|
4486 |
*
|
4487 |
* This procedure is called to recycle storage space associated with
|
4488 |
* the compiler-allocated array of local variables in a procedure call
|
4489 |
* frame. This procedure resembles TclDeleteVars above except that each
|
4490 |
* variable is stored in a call frame and not a hash table. For this
|
4491 |
* procedure to work correctly, it must not be possible for any of the
|
4492 |
* variable in the table to be accessed from Tcl commands (e.g. from
|
4493 |
* trace procedures).
|
4494 |
*
|
4495 |
* Results:
|
4496 |
* None.
|
4497 |
*
|
4498 |
* Side effects:
|
4499 |
* Variables are deleted and trace procedures are invoked, if
|
4500 |
* any are declared.
|
4501 |
*
|
4502 |
*----------------------------------------------------------------------
|
4503 |
*/
|
4504 |
|
4505 |
void
|
4506 |
TclDeleteCompiledLocalVars(iPtr, framePtr)
|
4507 |
Interp *iPtr; /* Interpreter to which variables belong. */
|
4508 |
CallFrame *framePtr; /* Procedure call frame containing
|
4509 |
* compiler-assigned local variables to
|
4510 |
* delete. */
|
4511 |
{
|
4512 |
register Var *varPtr;
|
4513 |
int flags; /* Flags passed to trace procedures. */
|
4514 |
Var *linkPtr;
|
4515 |
ActiveVarTrace *activePtr;
|
4516 |
int numLocals, i;
|
4517 |
|
4518 |
flags = TCL_TRACE_UNSETS;
|
4519 |
numLocals = framePtr->numCompiledLocals;
|
4520 |
varPtr = framePtr->compiledLocals;
|
4521 |
for (i = 0; i < numLocals; i++) {
|
4522 |
/*
|
4523 |
* For global/upvar variables referenced in procedures, decrement
|
4524 |
* the reference count on the variable referred to, and free
|
4525 |
* the referenced variable if it's no longer needed. Don't delete
|
4526 |
* the hash entry for the other variable if it's in the same table
|
4527 |
* as us: this will happen automatically later on.
|
4528 |
*/
|
4529 |
|
4530 |
if (TclIsVarLink(varPtr)) {
|
4531 |
linkPtr = varPtr->value.linkPtr;
|
4532 |
linkPtr->refCount--;
|
4533 |
if ((linkPtr->refCount == 0) && TclIsVarUndefined(linkPtr)
|
4534 |
&& (linkPtr->tracePtr == NULL)
|
4535 |
&& (linkPtr->flags & VAR_IN_HASHTABLE)) {
|
4536 |
if (linkPtr->hPtr == NULL) {
|
4537 |
ckfree((char *) linkPtr);
|
4538 |
} else {
|
4539 |
Tcl_DeleteHashEntry(linkPtr->hPtr);
|
4540 |
ckfree((char *) linkPtr);
|
4541 |
}
|
4542 |
}
|
4543 |
}
|
4544 |
|
4545 |
/*
|
4546 |
* Invoke traces on the variable that is being deleted. Then delete
|
4547 |
* the variable's trace records.
|
4548 |
*/
|
4549 |
|
4550 |
if (varPtr->tracePtr != NULL) {
|
4551 |
(void) CallTraces(iPtr, (Var *) NULL, varPtr,
|
4552 |
varPtr->name, (char *) NULL, flags);
|
4553 |
while (varPtr->tracePtr != NULL) {
|
4554 |
VarTrace *tracePtr = varPtr->tracePtr;
|
4555 |
varPtr->tracePtr = tracePtr->nextPtr;
|
4556 |
ckfree((char *) tracePtr);
|
4557 |
}
|
4558 |
for (activePtr = iPtr->activeTracePtr; activePtr != NULL;
|
4559 |
activePtr = activePtr->nextPtr) {
|
4560 |
if (activePtr->varPtr == varPtr) {
|
4561 |
activePtr->nextTracePtr = NULL;
|
4562 |
}
|
4563 |
}
|
4564 |
}
|
4565 |
|
4566 |
/*
|
4567 |
* Now if the variable is an array, delete its element hash table.
|
4568 |
* Otherwise, if it's a scalar variable, decrement the ref count
|
4569 |
* of its value.
|
4570 |
*/
|
4571 |
|
4572 |
if (TclIsVarArray(varPtr) && (varPtr->value.tablePtr != NULL)) {
|
4573 |
DeleteArray(iPtr, varPtr->name, varPtr, flags);
|
4574 |
}
|
4575 |
if (TclIsVarScalar(varPtr) && (varPtr->value.objPtr != NULL)) {
|
4576 |
TclDecrRefCount(varPtr->value.objPtr);
|
4577 |
varPtr->value.objPtr = NULL;
|
4578 |
}
|
4579 |
varPtr->hPtr = NULL;
|
4580 |
varPtr->tracePtr = NULL;
|
4581 |
TclSetVarUndefined(varPtr);
|
4582 |
TclSetVarScalar(varPtr);
|
4583 |
varPtr++;
|
4584 |
}
|
4585 |
}
|
4586 |
|
4587 |
/*
|
4588 |
*----------------------------------------------------------------------
|
4589 |
*
|
4590 |
* DeleteArray --
|
4591 |
*
|
4592 |
* This procedure is called to free up everything in an array
|
4593 |
* variable. It's the caller's responsibility to make sure
|
4594 |
* that the array is no longer accessible before this procedure
|
4595 |
* is called.
|
4596 |
*
|
4597 |
* Results:
|
4598 |
* None.
|
4599 |
*
|
4600 |
* Side effects:
|
4601 |
* All storage associated with varPtr's array elements is deleted
|
4602 |
* (including the array's hash table). Deletion trace procedures for
|
4603 |
* array elements are invoked, then deleted. Any pending traces for
|
4604 |
* array elements are also deleted.
|
4605 |
*
|
4606 |
*----------------------------------------------------------------------
|
4607 |
*/
|
4608 |
|
4609 |
static void
|
4610 |
DeleteArray(iPtr, arrayName, varPtr, flags)
|
4611 |
Interp *iPtr; /* Interpreter containing array. */
|
4612 |
char *arrayName; /* Name of array (used for trace
|
4613 |
* callbacks). */
|
4614 |
Var *varPtr; /* Pointer to variable structure. */
|
4615 |
int flags; /* Flags to pass to CallTraces:
|
4616 |
* TCL_TRACE_UNSETS and sometimes
|
4617 |
* TCL_INTERP_DESTROYED,
|
4618 |
* TCL_NAMESPACE_ONLY, or
|
4619 |
* TCL_GLOBAL_ONLY. */
|
4620 |
{
|
4621 |
Tcl_HashSearch search;
|
4622 |
register Tcl_HashEntry *hPtr;
|
4623 |
register Var *elPtr;
|
4624 |
ActiveVarTrace *activePtr;
|
4625 |
Tcl_Obj *objPtr;
|
4626 |
|
4627 |
DeleteSearches(varPtr);
|
4628 |
for (hPtr = Tcl_FirstHashEntry(varPtr->value.tablePtr, &search);
|
4629 |
hPtr != NULL; hPtr = Tcl_NextHashEntry(&search)) {
|
4630 |
elPtr = (Var *) Tcl_GetHashValue(hPtr);
|
4631 |
if (TclIsVarScalar(elPtr) && (elPtr->value.objPtr != NULL)) {
|
4632 |
objPtr = elPtr->value.objPtr;
|
4633 |
TclDecrRefCount(objPtr);
|
4634 |
elPtr->value.objPtr = NULL;
|
4635 |
}
|
4636 |
elPtr->hPtr = NULL;
|
4637 |
if (elPtr->tracePtr != NULL) {
|
4638 |
elPtr->flags &= ~VAR_TRACE_ACTIVE;
|
4639 |
(void) CallTraces(iPtr, (Var *) NULL, elPtr, arrayName,
|
4640 |
Tcl_GetHashKey(varPtr->value.tablePtr, hPtr), flags);
|
4641 |
while (elPtr->tracePtr != NULL) {
|
4642 |
VarTrace *tracePtr = elPtr->tracePtr;
|
4643 |
elPtr->tracePtr = tracePtr->nextPtr;
|
4644 |
ckfree((char *) tracePtr);
|
4645 |
}
|
4646 |
for (activePtr = iPtr->activeTracePtr; activePtr != NULL;
|
4647 |
activePtr = activePtr->nextPtr) {
|
4648 |
if (activePtr->varPtr == elPtr) {
|
4649 |
activePtr->nextTracePtr = NULL;
|
4650 |
}
|
4651 |
}
|
4652 |
}
|
4653 |
TclSetVarUndefined(elPtr);
|
4654 |
TclSetVarScalar(elPtr);
|
4655 |
if (elPtr->refCount == 0) {
|
4656 |
ckfree((char *) elPtr); /* element Vars are VAR_IN_HASHTABLE */
|
4657 |
}
|
4658 |
}
|
4659 |
Tcl_DeleteHashTable(varPtr->value.tablePtr);
|
4660 |
ckfree((char *) varPtr->value.tablePtr);
|
4661 |
}
|
4662 |
|
4663 |
/*
|
4664 |
*----------------------------------------------------------------------
|
4665 |
*
|
4666 |
* CleanupVar --
|
4667 |
*
|
4668 |
* This procedure is called when it looks like it may be OK to free up
|
4669 |
* a variable's storage. If the variable is in a hashtable, its Var
|
4670 |
* structure and hash table entry will be freed along with those of its
|
4671 |
* containing array, if any. This procedure is called, for example,
|
4672 |
* when a trace on a variable deletes a variable.
|
4673 |
*
|
4674 |
* Results:
|
4675 |
* None.
|
4676 |
*
|
4677 |
* Side effects:
|
4678 |
* If the variable (or its containing array) really is dead and in a
|
4679 |
* hashtable, then its Var structure, and possibly its hash table
|
4680 |
* entry, is freed up.
|
4681 |
*
|
4682 |
*----------------------------------------------------------------------
|
4683 |
*/
|
4684 |
|
4685 |
static void
|
4686 |
CleanupVar(varPtr, arrayPtr)
|
4687 |
Var *varPtr; /* Pointer to variable that may be a
|
4688 |
* candidate for being expunged. */
|
4689 |
Var *arrayPtr; /* Array that contains the variable, or
|
4690 |
* NULL if this variable isn't an array
|
4691 |
* element. */
|
4692 |
{
|
4693 |
if (TclIsVarUndefined(varPtr) && (varPtr->refCount == 0)
|
4694 |
&& (varPtr->tracePtr == NULL)
|
4695 |
&& (varPtr->flags & VAR_IN_HASHTABLE)) {
|
4696 |
if (varPtr->hPtr != NULL) {
|
4697 |
Tcl_DeleteHashEntry(varPtr->hPtr);
|
4698 |
}
|
4699 |
ckfree((char *) varPtr);
|
4700 |
}
|
4701 |
if (arrayPtr != NULL) {
|
4702 |
if (TclIsVarUndefined(arrayPtr) && (arrayPtr->refCount == 0)
|
4703 |
&& (arrayPtr->tracePtr == NULL)
|
4704 |
&& (arrayPtr->flags & VAR_IN_HASHTABLE)) {
|
4705 |
if (arrayPtr->hPtr != NULL) {
|
4706 |
Tcl_DeleteHashEntry(arrayPtr->hPtr);
|
4707 |
}
|
4708 |
ckfree((char *) arrayPtr);
|
4709 |
}
|
4710 |
}
|
4711 |
}
|
4712 |
/*
|
4713 |
*----------------------------------------------------------------------
|
4714 |
*
|
4715 |
* VarErrMsg --
|
4716 |
*
|
4717 |
* Generate a reasonable error message describing why a variable
|
4718 |
* operation failed.
|
4719 |
*
|
4720 |
* Results:
|
4721 |
* None.
|
4722 |
*
|
4723 |
* Side effects:
|
4724 |
* The interp's result is set to hold a message identifying the
|
4725 |
* variable given by part1 and part2 and describing why the
|
4726 |
* variable operation failed.
|
4727 |
*
|
4728 |
*----------------------------------------------------------------------
|
4729 |
*/
|
4730 |
|
4731 |
static void
|
4732 |
VarErrMsg(interp, part1, part2, operation, reason)
|
4733 |
Tcl_Interp *interp; /* Interpreter in which to record message. */
|
4734 |
char *part1, *part2; /* Variable's two-part name. */
|
4735 |
char *operation; /* String describing operation that failed,
|
4736 |
* e.g. "read", "set", or "unset". */
|
4737 |
char *reason; /* String describing why operation failed. */
|
4738 |
{
|
4739 |
Tcl_ResetResult(interp);
|
4740 |
Tcl_AppendResult(interp, "can't ", operation, " \"", part1,
|
4741 |
(char *) NULL);
|
4742 |
if (part2 != NULL) {
|
4743 |
Tcl_AppendResult(interp, "(", part2, ")", (char *) NULL);
|
4744 |
}
|
4745 |
Tcl_AppendResult(interp, "\": ", reason, (char *) NULL);
|
4746 |
}
|
4747 |
|
4748 |
|
4749 |
/*
|
4750 |
*----------------------------------------------------------------------
|
4751 |
*
|
4752 |
* TclTraceVarExists --
|
4753 |
*
|
4754 |
* This is called from info exists. We need to trigger read
|
4755 |
* and/or array traces because they may end up creating a
|
4756 |
* variable that doesn't currently exist.
|
4757 |
*
|
4758 |
* Results:
|
4759 |
* A pointer to the Var structure, or NULL.
|
4760 |
*
|
4761 |
* Side effects:
|
4762 |
* May fill in error messages in the interp.
|
4763 |
*
|
4764 |
*----------------------------------------------------------------------
|
4765 |
*/
|
4766 |
|
4767 |
Var *
|
4768 |
TclVarTraceExists(interp, varName)
|
4769 |
Tcl_Interp *interp; /* The interpreter */
|
4770 |
char *varName; /* The variable name */
|
4771 |
{
|
4772 |
Var *varPtr;
|
4773 |
Var *arrayPtr;
|
4774 |
char *msg;
|
4775 |
|
4776 |
/*
|
4777 |
* The choice of "create" flag values is delicate here, and
|
4778 |
* matches the semantics of GetVar. Things are still not perfect,
|
4779 |
* however, because if you do "info exists x" you get a varPtr
|
4780 |
* and therefore trigger traces. However, if you do
|
4781 |
* "info exists x(i)", then you only get a varPtr if x is already
|
4782 |
* known to be an array. Otherwise you get NULL, and no trace
|
4783 |
* is triggered. This matches Tcl 7.6 semantics.
|
4784 |
*/
|
4785 |
|
4786 |
varPtr = TclLookupVar(interp, varName, (char *) NULL,
|
4787 |
0, "access",
|
4788 |
/*createPart1*/ 0, /*createPart2*/ 1, &arrayPtr);
|
4789 |
if (varPtr == NULL) {
|
4790 |
return NULL;
|
4791 |
}
|
4792 |
if ((varPtr != NULL) &&
|
4793 |
((varPtr->tracePtr != NULL)
|
4794 |
|| ((arrayPtr != NULL) && (arrayPtr->tracePtr != NULL)))) {
|
4795 |
msg = CallTraces((Interp *)interp, arrayPtr, varPtr, varName,
|
4796 |
(char *) NULL, TCL_TRACE_READS);
|
4797 |
if (msg != NULL) {
|
4798 |
/*
|
4799 |
* If the variable doesn't exist anymore and no-one's using
|
4800 |
* it, then free up the relevant structures and hash table entries.
|
4801 |
*/
|
4802 |
|
4803 |
if (TclIsVarUndefined(varPtr)) {
|
4804 |
CleanupVar(varPtr, arrayPtr);
|
4805 |
}
|
4806 |
return NULL;
|
4807 |
}
|
4808 |
}
|
4809 |
return varPtr;
|
4810 |
}
|
4811 |
|
4812 |
|
4813 |
/* $History: tclvar.c $
|
4814 |
*
|
4815 |
* ***************** Version 1 *****************
|
4816 |
* User: Dtashley Date: 1/02/01 Time: 12:52a
|
4817 |
* Created in $/IjuScripter, IjuConsole/Source/Tcl Base
|
4818 |
* Initial check-in.
|
4819 |
*/
|
4820 |
|
4821 |
/* End of TCLVAR.C */ |