/[dtapublic]/projs/ets/trunk/src/c_tk_base_7_5_w_mods/tktext.c

Diff of /projs/ets/trunk/src/c_tk_base_7_5_w_mods/tktext.c

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-revision 70 by dashley,
Sat Nov  5 10:54:17 2016 UTC
+revision 71 by dashley,
Sat Nov  5 11:07:06 2016 UTC
 Line 1
  /* $Header$ */
  /*
   * tkText.c --
   *
   *      This module provides a big chunk of the implementation of
   *      multi-line editable text widgets for Tk.  Among other things,
   *      it provides the Tcl command interfaces to text widgets and
   *      the display code.  The B-tree representation of text is
   *      implemented elsewhere.
   *
   * Copyright (c) 1992-1994 The Regents of the University of California.
   * Copyright (c) 1994-1996 Sun Microsystems, Inc.
   * Copyright (c) 1999 by Scriptics Corporation.
   *
   * See the file "license.terms" for information on usage and redistribution
   * of this file, and for a DISCLAIMER OF ALL WARRANTIES.
   *
   * RCS: @(#) $Id: tktext.c,v 1.1.1.1 2001/06/13 05:08:42 dtashley Exp $
   */
  #include "default.h"
  #include "tkPort.h"
  #include "tkInt.h"
  #ifdef MAC_TCL
  #define Style TkStyle
  #define DInfo TkDInfo
  #endif
  #include "tkText.h"
  /*
   * Custom options for handling "-state"
   */
  static Tk_CustomOption stateOption = {
      (Tk_OptionParseProc *) TkStateParseProc,
      TkStatePrintProc, (ClientData) NULL /* only "normal" and "disabled" */
  };
  /*
   * Information used to parse text configuration options:
   */
  static Tk_ConfigSpec configSpecs[] = {
      {TK_CONFIG_BORDER, "-background", "background", "Background",
          DEF_TEXT_BG_COLOR, Tk_Offset(TkText, border), TK_CONFIG_COLOR_ONLY},
      {TK_CONFIG_BORDER, "-background", "background", "Background",
          DEF_TEXT_BG_MONO, Tk_Offset(TkText, border), TK_CONFIG_MONO_ONLY},
      {TK_CONFIG_SYNONYM, "-bd", "borderWidth", (char *) NULL,
          (char *) NULL, 0, 0},
      {TK_CONFIG_SYNONYM, "-bg", "background", (char *) NULL,
          (char *) NULL, 0, 0},
      {TK_CONFIG_PIXELS, "-borderwidth", "borderWidth", "BorderWidth",
          DEF_TEXT_BORDER_WIDTH, Tk_Offset(TkText, borderWidth), 0},
      {TK_CONFIG_ACTIVE_CURSOR, "-cursor", "cursor", "Cursor",
          DEF_TEXT_CURSOR, Tk_Offset(TkText, cursor), TK_CONFIG_NULL_OK},
      {TK_CONFIG_BOOLEAN, "-exportselection", "exportSelection",
          "ExportSelection", DEF_TEXT_EXPORT_SELECTION,
          Tk_Offset(TkText, exportSelection), 0},
      {TK_CONFIG_SYNONYM, "-fg", "foreground", (char *) NULL,
          (char *) NULL, 0, 0},
      {TK_CONFIG_FONT, "-font", "font", "Font",
          DEF_TEXT_FONT, Tk_Offset(TkText, tkfont), 0},
      {TK_CONFIG_COLOR, "-foreground", "foreground", "Foreground",
          DEF_TEXT_FG, Tk_Offset(TkText, fgColor), 0},
      {TK_CONFIG_PIXELS, "-height", "height", "Height",
          DEF_TEXT_HEIGHT, Tk_Offset(TkText, height), 0},
      {TK_CONFIG_COLOR, "-highlightbackground", "highlightBackground",
          "HighlightBackground", DEF_TEXT_HIGHLIGHT_BG,
          Tk_Offset(TkText, highlightBgColorPtr), 0},
      {TK_CONFIG_COLOR, "-highlightcolor", "highlightColor", "HighlightColor",
          DEF_TEXT_HIGHLIGHT, Tk_Offset(TkText, highlightColorPtr), 0},
      {TK_CONFIG_PIXELS, "-highlightthickness", "highlightThickness",
          "HighlightThickness",
          DEF_TEXT_HIGHLIGHT_WIDTH, Tk_Offset(TkText, highlightWidth), 0},
      {TK_CONFIG_BORDER, "-insertbackground", "insertBackground", "Foreground",
          DEF_TEXT_INSERT_BG, Tk_Offset(TkText, insertBorder), 0},
      {TK_CONFIG_PIXELS, "-insertborderwidth", "insertBorderWidth", "BorderWidth",
          DEF_TEXT_INSERT_BD_COLOR, Tk_Offset(TkText, insertBorderWidth),
          TK_CONFIG_COLOR_ONLY},
      {TK_CONFIG_PIXELS, "-insertborderwidth", "insertBorderWidth", "BorderWidth",
          DEF_TEXT_INSERT_BD_MONO, Tk_Offset(TkText, insertBorderWidth),
          TK_CONFIG_MONO_ONLY},
      {TK_CONFIG_INT, "-insertofftime", "insertOffTime", "OffTime",
          DEF_TEXT_INSERT_OFF_TIME, Tk_Offset(TkText, insertOffTime), 0},
      {TK_CONFIG_INT, "-insertontime", "insertOnTime", "OnTime",
          DEF_TEXT_INSERT_ON_TIME, Tk_Offset(TkText, insertOnTime), 0},
      {TK_CONFIG_PIXELS, "-insertwidth", "insertWidth", "InsertWidth",
          DEF_TEXT_INSERT_WIDTH, Tk_Offset(TkText, insertWidth), 0},
      {TK_CONFIG_PIXELS, "-padx", "padX", "Pad",
          DEF_TEXT_PADX, Tk_Offset(TkText, padX), 0},
      {TK_CONFIG_PIXELS, "-pady", "padY", "Pad",
          DEF_TEXT_PADY, Tk_Offset(TkText, padY), 0},
      {TK_CONFIG_RELIEF, "-relief", "relief", "Relief",
          DEF_TEXT_RELIEF, Tk_Offset(TkText, relief), 0},
      {TK_CONFIG_BORDER, "-selectbackground", "selectBackground", "Foreground",
          DEF_TEXT_SELECT_COLOR, Tk_Offset(TkText, selBorder),
          TK_CONFIG_COLOR_ONLY},
      {TK_CONFIG_BORDER, "-selectbackground", "selectBackground", "Foreground",
          DEF_TEXT_SELECT_MONO, Tk_Offset(TkText, selBorder),
          TK_CONFIG_MONO_ONLY},
      {TK_CONFIG_STRING, "-selectborderwidth", "selectBorderWidth", "BorderWidth",
          DEF_TEXT_SELECT_BD_COLOR, Tk_Offset(TkText, selBdString),
          TK_CONFIG_COLOR_ONLY|TK_CONFIG_NULL_OK},
      {TK_CONFIG_STRING, "-selectborderwidth", "selectBorderWidth", "BorderWidth",
          DEF_TEXT_SELECT_BD_MONO, Tk_Offset(TkText, selBdString),
          TK_CONFIG_MONO_ONLY|TK_CONFIG_NULL_OK},
      {TK_CONFIG_COLOR, "-selectforeground", "selectForeground", "Background",
          DEF_TEXT_SELECT_FG_COLOR, Tk_Offset(TkText, selFgColorPtr),
          TK_CONFIG_COLOR_ONLY},
      {TK_CONFIG_COLOR, "-selectforeground", "selectForeground", "Background",
          DEF_TEXT_SELECT_FG_MONO, Tk_Offset(TkText, selFgColorPtr),
          TK_CONFIG_MONO_ONLY},
      {TK_CONFIG_BOOLEAN, "-setgrid", "setGrid", "SetGrid",
          DEF_TEXT_SET_GRID, Tk_Offset(TkText, setGrid), 0},
      {TK_CONFIG_PIXELS, "-spacing1", "spacing1", "Spacing",
          DEF_TEXT_SPACING1, Tk_Offset(TkText, spacing1),
          TK_CONFIG_DONT_SET_DEFAULT},
      {TK_CONFIG_PIXELS, "-spacing2", "spacing2", "Spacing",
          DEF_TEXT_SPACING2, Tk_Offset(TkText, spacing2),
          TK_CONFIG_DONT_SET_DEFAULT},
      {TK_CONFIG_PIXELS, "-spacing3", "spacing3", "Spacing",
          DEF_TEXT_SPACING3, Tk_Offset(TkText, spacing3),
          TK_CONFIG_DONT_SET_DEFAULT},
      {TK_CONFIG_CUSTOM, "-state", "state", "State",
          DEF_TEXT_STATE, Tk_Offset(TkText, state), 0, &stateOption},
      {TK_CONFIG_STRING, "-tabs", "tabs", "Tabs",
          DEF_TEXT_TABS, Tk_Offset(TkText, tabOptionString), TK_CONFIG_NULL_OK},
      {TK_CONFIG_STRING, "-takefocus", "takeFocus", "TakeFocus",
          DEF_TEXT_TAKE_FOCUS, Tk_Offset(TkText, takeFocus),
          TK_CONFIG_NULL_OK},
      {TK_CONFIG_INT, "-width", "width", "Width",
          DEF_TEXT_WIDTH, Tk_Offset(TkText, width), 0},
      {TK_CONFIG_CUSTOM,
      "-wrap", "wrap", "Wrap",
          DEF_TEXT_WRAP,
     Tk_Offset(TkText, wrapMode),
 ,
     &textWrapModeOption},
      {TK_CONFIG_STRING, "-xscrollcommand", "xScrollCommand", "ScrollCommand",
          DEF_TEXT_XSCROLL_COMMAND, Tk_Offset(TkText, xScrollCmd),
          TK_CONFIG_NULL_OK},
      {TK_CONFIG_STRING, "-yscrollcommand", "yScrollCommand", "ScrollCommand",
          DEF_TEXT_YSCROLL_COMMAND, Tk_Offset(TkText, yScrollCmd),
          TK_CONFIG_NULL_OK},
      {TK_CONFIG_END, (char *) NULL, (char *) NULL, (char *) NULL,
          (char *) NULL, 0, 0}
  };
  /*
   * Boolean variable indicating whether or not special debugging code
   * should be executed.
   */
  int tkTextDebug = 0;
  /*
   * Custom options for handling "-wrap":
   */
  static int              WrapModeParseProc _ANSI_ARGS_((ClientData clientData,
                              Tcl_Interp *interp, Tk_Window tkwin, char *value,
                              char *widgRec, int offset));
  static char *           WrapModePrintProc _ANSI_ARGS_((ClientData clientData,
                              Tk_Window tkwin, char *widgRec, int offset,
                              Tcl_FreeProc **freeProcPtr));
  Tk_CustomOption textWrapModeOption = {
      WrapModeParseProc,
      WrapModePrintProc,
      (ClientData) NULL
  };
  /*
   *--------------------------------------------------------------
   *
   * WrapModeParseProc --
   *
   *      This procedure is invoked during option processing to handle
   *      "-wrap" options for text widgets.
   *
   * Results:
   *      A standard Tcl return value.
   *
   * Side effects:
   *      The wrap mode for a given item gets replaced by the wrap mode
   *      indicated in the value argument.
   *
   *--------------------------------------------------------------
   */
  static int
  WrapModeParseProc(clientData, interp, tkwin, value, widgRec, offset)
      ClientData clientData;              /* some flags.*/
      Tcl_Interp *interp;                 /* Used for reporting errors. */
      Tk_Window tkwin;                    /* Window containing canvas widget. */
      char *value;                        /* Value of option (list of tag
                                           * names). */
      char *widgRec;                      /* Pointer to record for item. */
      int offset;                         /* Offset into item. */
  {
      int c;
      size_t length;
      register TkWrapMode *wrapPtr = (TkWrapMode *) (widgRec + offset);
      if(value == NULL || *value == 0) {
          *wrapPtr = TEXT_WRAPMODE_NULL;
          return TCL_OK;
      }
      c = value[0];
      length = strlen(value);
      if ((c == 'c') && (strncmp(value, "char", length) == 0)) {
          *wrapPtr = TEXT_WRAPMODE_CHAR;
          return TCL_OK;
      }
      if ((c == 'n') && (strncmp(value, "none", length) == 0)) {
          *wrapPtr = TEXT_WRAPMODE_NONE;
          return TCL_OK;
      }
      if ((c == 'w') && (strncmp(value, "word", length) == 0)) {
          *wrapPtr = TEXT_WRAPMODE_WORD;
          return TCL_OK;
      }
      Tcl_AppendResult(interp, "bad wrap mode \"", value,
              "\": must be char, none, or word",
              (char *) NULL);
      *wrapPtr = TEXT_WRAPMODE_CHAR;
      return TCL_ERROR;
  }
  /*
   *--------------------------------------------------------------
   *
   * WrapModePrintProc --
   *
   *      This procedure is invoked by the Tk configuration code
   *      to produce a printable string for the "-wrap" configuration
   *      option for canvas items.
   *
   * Results:
   *      The return value is a string describing the state for
   *      the item referred to by "widgRec".  In addition, *freeProcPtr
   *      is filled in with the address of a procedure to call to free
   *      the result string when it's no longer needed (or NULL to
   *      indicate that the string doesn't need to be freed).
   *
   * Side effects:
   *      None.
   *
   *--------------------------------------------------------------
   */
  static char *
  WrapModePrintProc(clientData, tkwin, widgRec, offset, freeProcPtr)
      ClientData clientData;              /* Ignored. */
      Tk_Window tkwin;                    /* Window containing canvas widget. */
      char *widgRec;                      /* Pointer to record for item. */
      int offset;                         /* Ignored. */
      Tcl_FreeProc **freeProcPtr;         /* Pointer to variable to fill in with
                                           * information about how to reclaim
                                           * storage for return string. */
  {
      register TkWrapMode *wrapPtr = (TkWrapMode *) (widgRec + offset);
      if (*wrapPtr==TEXT_WRAPMODE_CHAR) {
          return "char";
      } else if (*wrapPtr==TEXT_WRAPMODE_NONE) {
          return "none";
      } else if (*wrapPtr==TEXT_WRAPMODE_WORD) {
          return "word";
      } else {
          return "";
      }
  }
  /*
   * Forward declarations for procedures defined later in this file:
   */
  static int              ConfigureText _ANSI_ARGS_((Tcl_Interp *interp,
                              TkText *textPtr, int argc, char **argv, int flags));
  static int              DeleteChars _ANSI_ARGS_((TkText *textPtr,
                              char *index1String, char *index2String));
  static void             DestroyText _ANSI_ARGS_((char *memPtr));
  static void             InsertChars _ANSI_ARGS_((TkText *textPtr,
                              TkTextIndex *indexPtr, char *string));
  static void             TextBlinkProc _ANSI_ARGS_((ClientData clientData));
  static void             TextCmdDeletedProc _ANSI_ARGS_((
                              ClientData clientData));
  static void             TextEventProc _ANSI_ARGS_((ClientData clientData,
                              XEvent *eventPtr));
  static int              TextFetchSelection _ANSI_ARGS_((ClientData clientData,
                              int offset, char *buffer, int maxBytes));
  static int              TextSearchCmd _ANSI_ARGS_((TkText *textPtr,
                              Tcl_Interp *interp, int argc, char **argv));
  static int              TextWidgetCmd _ANSI_ARGS_((ClientData clientData,
                              Tcl_Interp *interp, int argc, char **argv));
  static void             TextWorldChanged _ANSI_ARGS_((
                              ClientData instanceData));
  static int              TextDumpCmd _ANSI_ARGS_((TkText *textPtr,
                              Tcl_Interp *interp, int argc, char **argv));
  static void             DumpLine _ANSI_ARGS_((Tcl_Interp *interp,
                              TkText *textPtr, int what, TkTextLine *linePtr,
                              int start, int end, int lineno, char *command));
  static int              DumpSegment _ANSI_ARGS_((Tcl_Interp *interp, char *key,
                              char *value, char * command, TkTextIndex *index,
                              int what));
  /*
   * The structure below defines text class behavior by means of procedures
   * that can be invoked from generic window code.
   */
  static TkClassProcs textClass = {
      NULL,                       /* createProc. */
      TextWorldChanged,           /* geometryProc. */
      NULL                        /* modalProc. */
  };
  /*
   *--------------------------------------------------------------
   *
   * Tk_TextCmd --
   *
   *      This procedure is invoked to process the "text" Tcl command.
   *      See the user documentation for details on what it does.
   *
   * Results:
   *      A standard Tcl result.
   *
   * Side effects:
   *      See the user documentation.
   *
   *--------------------------------------------------------------
   */
  int
  Tk_TextCmd(clientData, interp, argc, argv)
      ClientData clientData;      /* Main window associated with
                                   * interpreter. */
      Tcl_Interp *interp;         /* Current interpreter. */
      int argc;                   /* Number of arguments. */
      char **argv;                /* Argument strings. */
  {
      Tk_Window tkwin = (Tk_Window) clientData;
      Tk_Window new;
      register TkText *textPtr;
      TkTextIndex startIndex;
      if (argc < 2) {
          Tcl_AppendResult(interp, "wrong # args: should be \"",
                  argv[0], " pathName ?options?\"", (char *) NULL);
          return TCL_ERROR;
      }
      /*
       * Create the window.
       */
      new = Tk_CreateWindowFromPath(interp, tkwin, argv[1], (char *) NULL);
      if (new == NULL) {
          return TCL_ERROR;
      }
      textPtr = (TkText *) ckalloc(sizeof(TkText));
      textPtr->tkwin = new;
      textPtr->display = Tk_Display(new);
      textPtr->interp = interp;
      textPtr->widgetCmd = Tcl_CreateCommand(interp,
              Tk_PathName(textPtr->tkwin), TextWidgetCmd,
              (ClientData) textPtr, TextCmdDeletedProc);
      textPtr->tree = TkBTreeCreate(textPtr);
      Tcl_InitHashTable(&textPtr->tagTable, TCL_STRING_KEYS);
      textPtr->numTags = 0;
      Tcl_InitHashTable(&textPtr->markTable, TCL_STRING_KEYS);
      Tcl_InitHashTable(&textPtr->windowTable, TCL_STRING_KEYS);
      Tcl_InitHashTable(&textPtr->imageTable, TCL_STRING_KEYS);
      textPtr->state = TK_STATE_NORMAL;
      textPtr->border = NULL;
      textPtr->borderWidth = 0;
      textPtr->padX = 0;
      textPtr->padY = 0;
      textPtr->relief = TK_RELIEF_FLAT;
      textPtr->highlightWidth = 0;
      textPtr->highlightBgColorPtr = NULL;
      textPtr->highlightColorPtr = NULL;
      textPtr->cursor = None;
      textPtr->fgColor = NULL;
      textPtr->tkfont = NULL;
      textPtr->charWidth = 1;
      textPtr->spacing1 = 0;
      textPtr->spacing2 = 0;
      textPtr->spacing3 = 0;
      textPtr->tabOptionString = NULL;
      textPtr->tabArrayPtr = NULL;
      textPtr->wrapMode = TEXT_WRAPMODE_CHAR;
      textPtr->width = 0;
      textPtr->height = 0;
      textPtr->setGrid = 0;
      textPtr->prevWidth = Tk_Width(new);
      textPtr->prevHeight = Tk_Height(new);
      TkTextCreateDInfo(textPtr);
      TkTextMakeByteIndex(textPtr->tree, 0, 0, &startIndex);
      TkTextSetYView(textPtr, &startIndex, 0);
      textPtr->selTagPtr = NULL;
      textPtr->selBorder = NULL;
      textPtr->selBdString = NULL;
      textPtr->selFgColorPtr = NULL;
      textPtr->exportSelection = 1;
      textPtr->abortSelections = 0;
      textPtr->insertMarkPtr = NULL;
      textPtr->insertBorder = NULL;
      textPtr->insertWidth = 0;
      textPtr->insertBorderWidth = 0;
      textPtr->insertOnTime = 0;
      textPtr->insertOffTime = 0;
      textPtr->insertBlinkHandler = (Tcl_TimerToken) NULL;
      textPtr->bindingTable = NULL;
      textPtr->currentMarkPtr = NULL;
      textPtr->pickEvent.type = LeaveNotify;
      textPtr->pickEvent.xcrossing.x = 0;
      textPtr->pickEvent.xcrossing.y = 0;
      textPtr->numCurTags = 0;
      textPtr->curTagArrayPtr = NULL;
      textPtr->takeFocus = NULL;
      textPtr->xScrollCmd = NULL;
      textPtr->yScrollCmd = NULL;
      textPtr->flags = 0;
      /*
       * Create the "sel" tag and the "current" and "insert" marks.
       */
      textPtr->selTagPtr = TkTextCreateTag(textPtr, "sel");
      textPtr->selTagPtr->reliefString =
              (char *) ckalloc(sizeof(DEF_TEXT_SELECT_RELIEF));
      strcpy(textPtr->selTagPtr->reliefString, DEF_TEXT_SELECT_RELIEF);
      textPtr->selTagPtr->relief = TK_RELIEF_RAISED;
      textPtr->currentMarkPtr = TkTextSetMark(textPtr, "current", &startIndex);
      textPtr->insertMarkPtr = TkTextSetMark(textPtr, "insert", &startIndex);
      Tk_SetClass(textPtr->tkwin, "Text");
      TkSetClassProcs(textPtr->tkwin, &textClass, (ClientData) textPtr);
      Tk_CreateEventHandler(textPtr->tkwin,
              ExposureMask|StructureNotifyMask|FocusChangeMask,
              TextEventProc, (ClientData) textPtr);
      Tk_CreateEventHandler(textPtr->tkwin, KeyPressMask|KeyReleaseMask
              |ButtonPressMask|ButtonReleaseMask|EnterWindowMask
              |LeaveWindowMask|PointerMotionMask|VirtualEventMask,
              TkTextBindProc, (ClientData) textPtr);
      Tk_CreateSelHandler(textPtr->tkwin, XA_PRIMARY, XA_STRING,
              TextFetchSelection, (ClientData) textPtr, XA_STRING);
      if (ConfigureText(interp, textPtr, argc-2, argv+2, 0) != TCL_OK) {
          Tk_DestroyWindow(textPtr->tkwin);
          return TCL_ERROR;
      }
      Tcl_SetResult(interp, Tk_PathName(textPtr->tkwin), TCL_STATIC);
      return TCL_OK;
  }
  /*
   *--------------------------------------------------------------
   *
   * TextWidgetCmd --
   *
   *      This procedure is invoked to process the Tcl command
   *      that corresponds to a text widget.  See the user
   *      documentation for details on what it does.
   *
   * Results:
   *      A standard Tcl result.
   *
   * Side effects:
   *      See the user documentation.
   *
   *--------------------------------------------------------------
   */
  static int
  TextWidgetCmd(clientData, interp, argc, argv)
      ClientData clientData;      /* Information about text widget. */
      Tcl_Interp *interp;         /* Current interpreter. */
      int argc;                   /* Number of arguments. */
      char **argv;                /* Argument strings. */
  {
      register TkText *textPtr = (TkText *) clientData;
      int result = TCL_OK;
      size_t length;
      int c;
      TkTextIndex index1, index2;
      if (argc < 2) {
          Tcl_AppendResult(interp, "wrong # args: should be \"",
                  argv[0], " option ?arg arg ...?\"", (char *) NULL);
          return TCL_ERROR;
      }
      Tcl_Preserve((ClientData) textPtr);
      c = argv[1][0];
      length = strlen(argv[1]);
      if ((c == 'b') && (strncmp(argv[1], "bbox", length) == 0)) {
          int x, y, width, height;
          if (argc != 3) {
              Tcl_AppendResult(interp, "wrong # args: should be \"",
                      argv[0], " bbox index\"", (char *) NULL);
              result = TCL_ERROR;
              goto done;
          }
          if (TkTextGetIndex(interp, textPtr, argv[2], &index1) != TCL_OK) {
              result = TCL_ERROR;
              goto done;
          }
          if (TkTextCharBbox(textPtr, &index1, &x, &y, &width, &height) == 0) {
              char buf[TCL_INTEGER_SPACE * 4];
              sprintf(buf, "%d %d %d %d", x, y, width, height);
              Tcl_SetResult(interp, buf, TCL_VOLATILE);
          }
      } else if ((c == 'c') && (strncmp(argv[1], "cget", length) == 0)
              && (length >= 2)) {
          if (argc != 3) {
              Tcl_AppendResult(interp, "wrong # args: should be \"",
                      argv[0], " cget option\"",
                      (char *) NULL);
              result = TCL_ERROR;
              goto done;
          }
          result = Tk_ConfigureValue(interp, textPtr->tkwin, configSpecs,
                  (char *) textPtr, argv[2], 0);
      } else if ((c == 'c') && (strncmp(argv[1], "compare", length) == 0)
              && (length >= 3)) {
          int relation, value;
          char *p;
          if (argc != 5) {
              Tcl_AppendResult(interp, "wrong # args: should be \"",
                      argv[0], " compare index1 op index2\"", (char *) NULL);
              result = TCL_ERROR;
              goto done;
          }
          if ((TkTextGetIndex(interp, textPtr, argv[2], &index1) != TCL_OK)
                  || (TkTextGetIndex(interp, textPtr, argv[4], &index2)
                  != TCL_OK)) {
              result = TCL_ERROR;
              goto done;
          }
          relation = TkTextIndexCmp(&index1, &index2);
          p = argv[3];
          if (p[0] == '<') {
                  value = (relation < 0);
              if ((p[1] == '=') && (p[2] == 0)) {
                  value = (relation <= 0);
              } else if (p[1] != 0) {
                  compareError:
                  Tcl_AppendResult(interp, "bad comparison operator \"",
                          argv[3], "\": must be <, <=, ==, >=, >, or !=",
                          (char *) NULL);
                  result = TCL_ERROR;
                  goto done;
              }
          } else if (p[0] == '>') {
                  value = (relation > 0);
              if ((p[1] == '=') && (p[2] == 0)) {
                  value = (relation >= 0);
              } else if (p[1] != 0) {
                  goto compareError;
              }
          } else if ((p[0] == '=') && (p[1] == '=') && (p[2] == 0)) {
              value = (relation == 0);
          } else if ((p[0] == '!') && (p[1] == '=') && (p[2] == 0)) {
              value = (relation != 0);
          } else {
              goto compareError;
          }
          Tcl_SetResult(interp, ((value) ? "1" : "0"), TCL_STATIC);
      } else if ((c == 'c') && (strncmp(argv[1], "configure", length) == 0)
              && (length >= 3)) {
          if (argc == 2) {
              result = Tk_ConfigureInfo(interp, textPtr->tkwin, configSpecs,
                      (char *) textPtr, (char *) NULL, 0);
          } else if (argc == 3) {
              result = Tk_ConfigureInfo(interp, textPtr->tkwin, configSpecs,
                      (char *) textPtr, argv[2], 0);
          } else {
              result = ConfigureText(interp, textPtr, argc-2, argv+2,
                      TK_CONFIG_ARGV_ONLY);
          }
      } else if ((c == 'd') && (strncmp(argv[1], "debug", length) == 0)
              && (length >= 3)) {
          if (argc > 3) {
              Tcl_AppendResult(interp, "wrong # args: should be \"",
                      argv[0], " debug boolean\"", (char *) NULL);
              result = TCL_ERROR;
              goto done;
          }
          if (argc == 2) {
              Tcl_SetResult(interp, ((tkBTreeDebug) ? "1" : "0"), TCL_STATIC);
          } else {
              if (Tcl_GetBoolean(interp, argv[2], &tkBTreeDebug) != TCL_OK) {
                  result = TCL_ERROR;
                  goto done;
              }
              tkTextDebug = tkBTreeDebug;
          }
      } else if ((c == 'd') && (strncmp(argv[1], "delete", length) == 0)
              && (length >= 3)) {
          if ((argc != 3) && (argc != 4)) {
              Tcl_AppendResult(interp, "wrong # args: should be \"",
                      argv[0], " delete index1 ?index2?\"", (char *) NULL);
              result = TCL_ERROR;
              goto done;
          }
          if (textPtr->state == TK_STATE_NORMAL) {
              result = DeleteChars(textPtr, argv[2],
                      (argc == 4) ? argv[3] : (char *) NULL);
          }
      } else if ((c == 'd') && (strncmp(argv[1], "dlineinfo", length) == 0)
              && (length >= 2)) {
          int x, y, width, height, base;
          if (argc != 3) {
              Tcl_AppendResult(interp, "wrong # args: should be \"",
                      argv[0], " dlineinfo index\"", (char *) NULL);
              result = TCL_ERROR;
              goto done;
          }
          if (TkTextGetIndex(interp, textPtr, argv[2], &index1) != TCL_OK) {
              result = TCL_ERROR;
              goto done;
          }
          if (TkTextDLineInfo(textPtr, &index1, &x, &y, &width, &height, &base)
                  == 0) {
              char buf[TCL_INTEGER_SPACE * 5];
              sprintf(buf, "%d %d %d %d %d", x, y, width, height, base);
              Tcl_SetResult(interp, buf, TCL_VOLATILE);
          }
      } else if ((c == 'g') && (strncmp(argv[1], "get", length) == 0)) {
          if ((argc != 3) && (argc != 4)) {
              Tcl_AppendResult(interp, "wrong # args: should be \"",
                      argv[0], " get index1 ?index2?\"", (char *) NULL);
              result = TCL_ERROR;
              goto done;
          }
          if (TkTextGetIndex(interp, textPtr, argv[2], &index1) != TCL_OK) {
              result = TCL_ERROR;
              goto done;
          }
          if (argc == 3) {
              index2 = index1;
              TkTextIndexForwChars(&index2, 1, &index2);
          } else if (TkTextGetIndex(interp, textPtr, argv[3], &index2)
                  != TCL_OK) {
              result = TCL_ERROR;
              goto done;
          }
          if (TkTextIndexCmp(&index1, &index2) >= 0) {
              goto done;
          }
          while (1) {
              int offset, last, savedChar;
              TkTextSegment *segPtr;
              segPtr = TkTextIndexToSeg(&index1, &offset);
              last = segPtr->size;
              if (index1.linePtr == index2.linePtr) {
                  int last2;
                  if (index2.byteIndex == index1.byteIndex) {
                      break;
                  }
                  last2 = index2.byteIndex - index1.byteIndex + offset;
                  if (last2 < last) {
                      last = last2;
                  }
              }
              if (segPtr->typePtr == &tkTextCharType) {
                  savedChar = segPtr->body.chars[last];
                  segPtr->body.chars[last] = 0;
                  Tcl_AppendResult(interp, segPtr->body.chars + offset,
                          (char *) NULL);
                  segPtr->body.chars[last] = savedChar;
              }
              TkTextIndexForwBytes(&index1, last-offset, &index1);
          }
      } else if ((c == 'i') && (strncmp(argv[1], "index", length) == 0)
              && (length >= 3)) {
          char buf[200];
          if (argc != 3) {
              Tcl_AppendResult(interp, "wrong # args: should be \"",
                      argv[0], " index index\"",
                      (char *) NULL);
              result = TCL_ERROR;
              goto done;
          }
          if (TkTextGetIndex(interp, textPtr, argv[2], &index1) != TCL_OK) {
              result = TCL_ERROR;
              goto done;
          }
          TkTextPrintIndex(&index1, buf);
          Tcl_SetResult(interp, buf, TCL_VOLATILE);
      } else if ((c == 'i') && (strncmp(argv[1], "insert", length) == 0)
              && (length >= 3)) {
          int i, j, numTags;
          char **tagNames;
          TkTextTag **oldTagArrayPtr;
          if (argc < 4) {
              Tcl_AppendResult(interp, "wrong # args: should be \"",
                      argv[0],
                      " insert index chars ?tagList chars tagList ...?\"",
                      (char *) NULL);
              result = TCL_ERROR;
              goto done;
          }
          if (TkTextGetIndex(interp, textPtr, argv[2], &index1) != TCL_OK) {
              result = TCL_ERROR;
              goto done;
          }
          if (textPtr->state == TK_STATE_NORMAL) {
              for (j = 3;  j < argc; j += 2) {
                  InsertChars(textPtr, &index1, argv[j]);
                  if (argc > (j+1)) {
                      TkTextIndexForwBytes(&index1, (int) strlen(argv[j]),
                              &index2);
                      oldTagArrayPtr = TkBTreeGetTags(&index1, &numTags);
                      if (oldTagArrayPtr != NULL) {
                          for (i = 0; i < numTags; i++) {
                              TkBTreeTag(&index1, &index2, oldTagArrayPtr[i], 0);
                          }
                          ckfree((char *) oldTagArrayPtr);
                      }
                      if (Tcl_SplitList(interp, argv[j+1], &numTags, &tagNames)
                              != TCL_OK) {
                          result = TCL_ERROR;
                          goto done;
                      }
                      for (i = 0; i < numTags; i++) {
                          TkBTreeTag(&index1, &index2,
                                  TkTextCreateTag(textPtr, tagNames[i]), 1);
                      }
                      ckfree((char *) tagNames);
                      index1 = index2;
                  }
              }
          }
      } else if ((c == 'd') && (strncmp(argv[1], "dump", length) == 0)) {
          result = TextDumpCmd(textPtr, interp, argc, argv);
      } else if ((c == 'i') && (strncmp(argv[1], "image", length) == 0)) {
          result = TkTextImageCmd(textPtr, interp, argc, argv);
      } else if ((c == 'm') && (strncmp(argv[1], "mark", length) == 0)) {
          result = TkTextMarkCmd(textPtr, interp, argc, argv);
      } else if ((c == 's') && (strcmp(argv[1], "scan") == 0) && (length >= 2)) {
          result = TkTextScanCmd(textPtr, interp, argc, argv);
      } else if ((c == 's') && (strcmp(argv[1], "search") == 0)
              && (length >= 3)) {
          result = TextSearchCmd(textPtr, interp, argc, argv);
      } else if ((c == 's') && (strcmp(argv[1], "see") == 0) && (length >= 3)) {
          result = TkTextSeeCmd(textPtr, interp, argc, argv);
      } else if ((c == 't') && (strcmp(argv[1], "tag") == 0)) {
          result = TkTextTagCmd(textPtr, interp, argc, argv);
      } else if ((c == 'w') && (strncmp(argv[1], "window", length) == 0)) {
          result = TkTextWindowCmd(textPtr, interp, argc, argv);
      } else if ((c == 'x') && (strncmp(argv[1], "xview", length) == 0)) {
          result = TkTextXviewCmd(textPtr, interp, argc, argv);
      } else if ((c == 'y') && (strncmp(argv[1], "yview", length) == 0)
              && (length >= 2)) {
          result = TkTextYviewCmd(textPtr, interp, argc, argv);
      } else {
          Tcl_AppendResult(interp, "bad option \"", argv[1],
                  "\": must be bbox, cget, compare, configure, debug, delete, ",
                  "dlineinfo, dump, get, image, index, insert, mark, scan, ",
                  "search, see, tag, window, xview, or yview",
                  (char *) NULL);
          result = TCL_ERROR;
      }
      done:
      Tcl_Release((ClientData) textPtr);
      return result;
  }
  /*
   *----------------------------------------------------------------------
   *
   * DestroyText --
   *
   *      This procedure is invoked by Tcl_EventuallyFree or Tcl_Release
   *      to clean up the internal structure of a text at a safe time
   *      (when no-one is using it anymore).
   *
   * Results:
   *      None.
   *
   * Side effects:
   *      Everything associated with the text is freed up.
   *
   *----------------------------------------------------------------------
   */
  static void
  DestroyText(memPtr)
      char *memPtr;               /* Info about text widget. */
  {
      register TkText *textPtr = (TkText *) memPtr;
      Tcl_HashSearch search;
      Tcl_HashEntry *hPtr;
      TkTextTag *tagPtr;
      /*
       * Free up all the stuff that requires special handling, then
       * let Tk_FreeOptions handle all the standard option-related
       * stuff.  Special note:  free up display-related information
       * before deleting the B-tree, since display-related stuff
       * may refer to stuff in the B-tree.
       */
      TkTextFreeDInfo(textPtr);
      TkBTreeDestroy(textPtr->tree);
      for (hPtr = Tcl_FirstHashEntry(&textPtr->tagTable, &search);
              hPtr != NULL; hPtr = Tcl_NextHashEntry(&search)) {
          tagPtr = (TkTextTag *) Tcl_GetHashValue(hPtr);
          TkTextFreeTag(textPtr, tagPtr);
      }
      Tcl_DeleteHashTable(&textPtr->tagTable);
      for (hPtr = Tcl_FirstHashEntry(&textPtr->markTable, &search);
              hPtr != NULL; hPtr = Tcl_NextHashEntry(&search)) {
          ckfree((char *) Tcl_GetHashValue(hPtr));
      }
      Tcl_DeleteHashTable(&textPtr->markTable);
      if (textPtr->tabArrayPtr != NULL) {
          ckfree((char *) textPtr->tabArrayPtr);
      }
      if (textPtr->insertBlinkHandler != NULL) {
          Tcl_DeleteTimerHandler(textPtr->insertBlinkHandler);
      }
      if (textPtr->bindingTable != NULL) {
          Tk_DeleteBindingTable(textPtr->bindingTable);
      }
      /*
       * NOTE: do NOT free up selBorder, selBdString, or selFgColorPtr:
       * they are duplicates of information in the "sel" tag, which was
       * freed up as part of deleting the tags above.
       */
      textPtr->selBorder = NULL;
      textPtr->selBdString = NULL;
      textPtr->selFgColorPtr = NULL;
      Tk_FreeOptions(configSpecs, (char *) textPtr, textPtr->display, 0);
      ckfree((char *) textPtr);
  }
  /*
   *----------------------------------------------------------------------
   *
   * ConfigureText --
   *
   *      This procedure is called to process an argv/argc list, plus
   *      the Tk option database, in order to configure (or
   *      reconfigure) a text widget.
   *
   * Results:
   *      The return value is a standard Tcl result.  If TCL_ERROR is
   *      returned, then the interp's result contains an error message.
   *
   * Side effects:
   *      Configuration information, such as text string, colors, font,
   *      etc. get set for textPtr;  old resources get freed, if there
   *      were any.
   *
   *----------------------------------------------------------------------
   */
  static int
  ConfigureText(interp, textPtr, argc, argv, flags)
      Tcl_Interp *interp;         /* Used for error reporting. */
      register TkText *textPtr;   /* Information about widget;  may or may
                                   * not already have values for some fields. */
      int argc;                   /* Number of valid entries in argv. */
      char **argv;                /* Arguments. */
      int flags;                  /* Flags to pass to Tk_ConfigureWidget. */
  {
      int oldExport = textPtr->exportSelection;
      if (Tk_ConfigureWidget(interp, textPtr->tkwin, configSpecs,
              argc, argv, (char *) textPtr, flags) != TCL_OK) {
          return TCL_ERROR;
      }
      /*
       * A few other options also need special processing, such as parsing
       * the geometry and setting the background from a 3-D border.
       */
      Tk_SetBackgroundFromBorder(textPtr->tkwin, textPtr->border);
      /*
       * Don't allow negative spacings.
       */
      if (textPtr->spacing1 < 0) {
          textPtr->spacing1 = 0;
      }
      if (textPtr->spacing2 < 0) {
          textPtr->spacing2 = 0;
      }
      if (textPtr->spacing3 < 0) {
          textPtr->spacing3 = 0;
      }
      /*
       * Parse tab stops.
       */
      if (textPtr->tabArrayPtr != NULL) {
          ckfree((char *) textPtr->tabArrayPtr);
          textPtr->tabArrayPtr = NULL;
      }
      if (textPtr->tabOptionString != NULL) {
          textPtr->tabArrayPtr = TkTextGetTabs(interp, textPtr->tkwin,
                  textPtr->tabOptionString);
          if (textPtr->tabArrayPtr == NULL) {
              Tcl_AddErrorInfo(interp,"\n    (while processing -tabs option)");
              return TCL_ERROR;
          }
      }
      /*
       * Make sure that configuration options are properly mirrored
       * between the widget record and the "sel" tags.  NOTE: we don't
       * have to free up information during the mirroring;  old
       * information was freed when it was replaced in the widget
       * record.
       */
      textPtr->selTagPtr->border = textPtr->selBorder;
      if (textPtr->selTagPtr->bdString != textPtr->selBdString) {
          textPtr->selTagPtr->bdString = textPtr->selBdString;
          if (textPtr->selBdString != NULL) {
              if (Tk_GetPixels(interp, textPtr->tkwin, textPtr->selBdString,
                      &textPtr->selTagPtr->borderWidth) != TCL_OK) {
                  return TCL_ERROR;
              }
              if (textPtr->selTagPtr->borderWidth < 0) {
                  textPtr->selTagPtr->borderWidth = 0;
              }
          }
      }
      textPtr->selTagPtr->fgColor = textPtr->selFgColorPtr;
      textPtr->selTagPtr->affectsDisplay = 0;
      if ((textPtr->selTagPtr->border != NULL)
              || (textPtr->selTagPtr->bdString != NULL)
              || (textPtr->selTagPtr->reliefString != NULL)
              || (textPtr->selTagPtr->bgStipple != None)
              || (textPtr->selTagPtr->fgColor != NULL)
              || (textPtr->selTagPtr->tkfont != None)
              || (textPtr->selTagPtr->fgStipple != None)
              || (textPtr->selTagPtr->justifyString != NULL)
              || (textPtr->selTagPtr->lMargin1String != NULL)
              || (textPtr->selTagPtr->lMargin2String != NULL)
              || (textPtr->selTagPtr->offsetString != NULL)
              || (textPtr->selTagPtr->overstrikeString != NULL)
              || (textPtr->selTagPtr->rMarginString != NULL)
              || (textPtr->selTagPtr->spacing1String != NULL)
              || (textPtr->selTagPtr->spacing2String != NULL)
              || (textPtr->selTagPtr->spacing3String != NULL)
              || (textPtr->selTagPtr->tabString != NULL)
              || (textPtr->selTagPtr->underlineString != NULL)
              || (textPtr->selTagPtr->elideString != NULL)
              || (textPtr->selTagPtr->wrapMode != TEXT_WRAPMODE_NULL)) {
          textPtr->selTagPtr->affectsDisplay = 1;
      }
      TkTextRedrawTag(textPtr, (TkTextIndex *) NULL, (TkTextIndex *) NULL,
              textPtr->selTagPtr, 1);
      /*
       * Claim the selection if we've suddenly started exporting it and there
       * are tagged characters.
       */
      if (textPtr->exportSelection && (!oldExport)) {
          TkTextSearch search;
          TkTextIndex first, last;
          TkTextMakeByteIndex(textPtr->tree, 0, 0, &first);
          TkTextMakeByteIndex(textPtr->tree,
                  TkBTreeNumLines(textPtr->tree), 0, &last);
          TkBTreeStartSearch(&first, &last, textPtr->selTagPtr, &search);
          if (TkBTreeCharTagged(&first, textPtr->selTagPtr)
                  || TkBTreeNextTag(&search)) {
              Tk_OwnSelection(textPtr->tkwin, XA_PRIMARY, TkTextLostSelection,
                      (ClientData) textPtr);
              textPtr->flags |= GOT_SELECTION;
          }
      }
      /*
       * Register the desired geometry for the window, and arrange for
       * the window to be redisplayed.
       */
      if (textPtr->width <= 0) {
          textPtr->width = 1;
      }
      if (textPtr->height <= 0) {
          textPtr->height = 1;
      }
      TextWorldChanged((ClientData) textPtr);
      return TCL_OK;
  }
  /*
   *---------------------------------------------------------------------------
   *
   * TextWorldChanged --
   *
   *      This procedure is called when the world has changed in some
   *      way and the widget needs to recompute all its graphics contexts
   *      and determine its new geometry.
   *
   * Results:
   *      None.
   *
   * Side effects:
   *      Configures all tags in the Text with a empty argc/argv, for
   *      the side effect of causing all the items to recompute their
   *      geometry and to be redisplayed.
   *
   *---------------------------------------------------------------------------
   */
  static void
  TextWorldChanged(instanceData)
      ClientData instanceData;    /* Information about widget. */
  {
      TkText *textPtr;
      Tk_FontMetrics fm;
      textPtr = (TkText *) instanceData;
      textPtr->charWidth = Tk_TextWidth(textPtr->tkfont, "0", 1);
      if (textPtr->charWidth <= 0) {
          textPtr->charWidth = 1;
      }
      Tk_GetFontMetrics(textPtr->tkfont, &fm);
      Tk_GeometryRequest(textPtr->tkwin,
              textPtr->width * textPtr->charWidth + 2*textPtr->borderWidth
                      + 2*textPtr->padX + 2*textPtr->highlightWidth,
              textPtr->height * (fm.linespace + textPtr->spacing1
                      + textPtr->spacing3) + 2*textPtr->borderWidth
                      + 2*textPtr->padY + 2*textPtr->highlightWidth);
      Tk_SetInternalBorder(textPtr->tkwin,
              textPtr->borderWidth + textPtr->highlightWidth);
      if (textPtr->setGrid) {
          Tk_SetGrid(textPtr->tkwin, textPtr->width, textPtr->height,
                  textPtr->charWidth, fm.linespace);
      } else {
          Tk_UnsetGrid(textPtr->tkwin);
      }
      TkTextRelayoutWindow(textPtr);
  }
  /*
   *--------------------------------------------------------------
   *
   * TextEventProc --
   *
   *      This procedure is invoked by the Tk dispatcher on
   *      structure changes to a text.  For texts with 3D
   *      borders, this procedure is also invoked for exposures.
   *
   * Results:
   *      None.
   *
   * Side effects:
   *      When the window gets deleted, internal structures get
   *      cleaned up.  When it gets exposed, it is redisplayed.
   *
   *--------------------------------------------------------------
   */
  static void
  TextEventProc(clientData, eventPtr)
      ClientData clientData;      /* Information about window. */
      register XEvent *eventPtr;  /* Information about event. */
  {
      register TkText *textPtr = (TkText *) clientData;
      TkTextIndex index, index2;
      if (eventPtr->type == Expose) {
          TkTextRedrawRegion(textPtr, eventPtr->xexpose.x,
                  eventPtr->xexpose.y, eventPtr->xexpose.width,
                  eventPtr->xexpose.height);
      } else if (eventPtr->type == ConfigureNotify) {
          if ((textPtr->prevWidth != Tk_Width(textPtr->tkwin))
                  || (textPtr->prevHeight != Tk_Height(textPtr->tkwin))) {
              TkTextRelayoutWindow(textPtr);
              textPtr->prevWidth = Tk_Width(textPtr->tkwin);
              textPtr->prevHeight = Tk_Height(textPtr->tkwin);
          }
      } else if (eventPtr->type == DestroyNotify) {
          if (textPtr->tkwin != NULL) {
              if (textPtr->setGrid) {
                  Tk_UnsetGrid(textPtr->tkwin);
              }
              textPtr->tkwin = NULL;
              Tcl_DeleteCommandFromToken(textPtr->interp,
                      textPtr->widgetCmd);
          }
          Tcl_EventuallyFree((ClientData) textPtr, DestroyText);
      } else if ((eventPtr->type == FocusIn) || (eventPtr->type == FocusOut)) {
          if (eventPtr->xfocus.detail != NotifyInferior) {
              Tcl_DeleteTimerHandler(textPtr->insertBlinkHandler);
              if (eventPtr->type == FocusIn) {
                  textPtr->flags |= GOT_FOCUS | INSERT_ON;
                  if (textPtr->insertOffTime != 0) {
                      textPtr->insertBlinkHandler = Tcl_CreateTimerHandler(
                              textPtr->insertOnTime, TextBlinkProc,
                              (ClientData) textPtr);
                  }
              } else {
                  textPtr->flags &= ~(GOT_FOCUS | INSERT_ON);
                  textPtr->insertBlinkHandler = (Tcl_TimerToken) NULL;
              }
  #ifndef ALWAYS_SHOW_SELECTION
              TkTextRedrawTag(textPtr, NULL, NULL, textPtr->selTagPtr, 1);
  #endif
              TkTextMarkSegToIndex(textPtr, textPtr->insertMarkPtr, &index);
              TkTextIndexForwChars(&index, 1, &index2);
              TkTextChanged(textPtr, &index, &index2);
              if (textPtr->highlightWidth > 0) {
                  TkTextRedrawRegion(textPtr, 0, 0, textPtr->highlightWidth,
                          textPtr->highlightWidth);
              }
          }
      }
  }
  /*
   *----------------------------------------------------------------------
   *
   * TextCmdDeletedProc --
   *
   *      This procedure is invoked when a widget command is deleted.  If
   *      the widget isn't already in the process of being destroyed,
   *      this command destroys it.
   *
   * Results:
   *      None.
   *
   * Side effects:
   *      The widget is destroyed.
   *
   *----------------------------------------------------------------------
   */
  static void
  TextCmdDeletedProc(clientData)
      ClientData clientData;      /* Pointer to widget record for widget. */
  {
      TkText *textPtr = (TkText *) clientData;
      Tk_Window tkwin = textPtr->tkwin;
      /*
       * This procedure could be invoked either because the window was
       * destroyed and the command was then deleted (in which case tkwin
       * is NULL) or because the command was deleted, and then this procedure
       * destroys the widget.
       */
      if (tkwin != NULL) {
          if (textPtr->setGrid) {
              Tk_UnsetGrid(textPtr->tkwin);
          }
          textPtr->tkwin = NULL;
          Tk_DestroyWindow(tkwin);
      }
  }
  /*
   *----------------------------------------------------------------------
   *
   * InsertChars --
   *
   *      This procedure implements most of the functionality of the
   *      "insert" widget command.
   *
   * Results:
   *      None.
   *
   * Side effects:
   *      The characters in "string" get added to the text just before
   *      the character indicated by "indexPtr".
   *
   *----------------------------------------------------------------------
   */
  static void
  InsertChars(textPtr, indexPtr, string)
      TkText *textPtr;            /* Overall information about text widget. */
      TkTextIndex *indexPtr;      /* Where to insert new characters.  May be
                                   * modified and/or invalidated. */
      char *string;               /* Null-terminated string containing new
                                   * information to add to text. */
  {
      int lineIndex, resetView, offset;
      TkTextIndex newTop;
      /*
       * Don't allow insertions on the last (dummy) line of the text.
       */
      lineIndex = TkBTreeLineIndex(indexPtr->linePtr);
      if (lineIndex == TkBTreeNumLines(textPtr->tree)) {
          lineIndex--;
          TkTextMakeByteIndex(textPtr->tree, lineIndex, 1000000, indexPtr);
      }
      /*
       * Notify the display module that lines are about to change, then do
       * the insertion.  If the insertion occurs on the top line of the
       * widget (textPtr->topIndex), then we have to recompute topIndex
       * after the insertion, since the insertion could invalidate it.
       */
      resetView = offset = 0;
      if (indexPtr->linePtr == textPtr->topIndex.linePtr) {
          resetView = 1;
          offset = textPtr->topIndex.byteIndex;
          if (offset > indexPtr->byteIndex) {
              offset += strlen(string);
          }
      }
      TkTextChanged(textPtr, indexPtr, indexPtr);
      TkBTreeInsertChars(indexPtr, string);
      if (resetView) {
          TkTextMakeByteIndex(textPtr->tree, lineIndex, 0, &newTop);
          TkTextIndexForwBytes(&newTop, offset, &newTop);
          TkTextSetYView(textPtr, &newTop, 0);
      }
      /*
       * Invalidate any selection retrievals in progress.
       */
      textPtr->abortSelections = 1;
  }
  /*
   *----------------------------------------------------------------------
   *
   * DeleteChars --
   *
   *      This procedure implements most of the functionality of the
   *      "delete" widget command.
   *
   * Results:
   *      Returns a standard Tcl result, and leaves an error message
   *      in textPtr->interp if there is an error.
   *
   * Side effects:
   *      Characters get deleted from the text.
   *
   *----------------------------------------------------------------------
   */
  static int
  DeleteChars(textPtr, index1String, index2String)
      TkText *textPtr;            /* Overall information about text widget. */
      char *index1String;         /* String describing location of first
                                   * character to delete. */
      char *index2String;         /* String describing location of last
                                   * character to delete.  NULL means just
                                   * delete the one character given by
                                   * index1String. */
  {
      int line1, line2, line, byteIndex, resetView;
      TkTextIndex index1, index2;
      /*
       * Parse the starting and stopping indices.
       */
      if (TkTextGetIndex(textPtr->interp, textPtr, index1String, &index1)
              != TCL_OK) {
          return TCL_ERROR;
      }
      if (index2String != NULL) {
          if (TkTextGetIndex(textPtr->interp, textPtr, index2String, &index2)
                  != TCL_OK) {
              return TCL_ERROR;
          }
      } else {
          index2 = index1;
          TkTextIndexForwChars(&index2, 1, &index2);
      }
      /*
       * Make sure there's really something to delete.
       */
      if (TkTextIndexCmp(&index1, &index2) >= 0) {
          return TCL_OK;
      }
      /*
       * The code below is ugly, but it's needed to make sure there
       * is always a dummy empty line at the end of the text.  If the
       * final newline of the file (just before the dummy line) is being
       * deleted, then back up index to just before the newline.  If
       * there is a newline just before the first character being deleted,
       * then back up the first index too, so that an even number of lines
       * gets deleted.  Furthermore, remove any tags that are present on
       * the newline that isn't going to be deleted after all (this simulates
       * deleting the newline and then adding a "clean" one back again).
       */
      line1 = TkBTreeLineIndex(index1.linePtr);
      line2 = TkBTreeLineIndex(index2.linePtr);
      if (line2 == TkBTreeNumLines(textPtr->tree)) {
          TkTextTag **arrayPtr;
          int arraySize, i;
          TkTextIndex oldIndex2;
          oldIndex2 = index2;
          TkTextIndexBackChars(&oldIndex2, 1, &index2);
          line2--;
          if ((index1.byteIndex == 0) && (line1 != 0)) {
              TkTextIndexBackChars(&index1, 1, &index1);
              line1--;
          }
          arrayPtr = TkBTreeGetTags(&index2, &arraySize);
          if (arrayPtr != NULL) {
              for (i = 0; i < arraySize; i++) {
                  TkBTreeTag(&index2, &oldIndex2, arrayPtr[i], 0);
              }
              ckfree((char *) arrayPtr);
          }
      }
      /*
       * Tell the display what's about to happen so it can discard
       * obsolete display information, then do the deletion.  Also,
       * if the deletion involves the top line on the screen, then
       * we have to reset the view (the deletion will invalidate
       * textPtr->topIndex).  Compute what the new first character
       * will be, then do the deletion, then reset the view.
       */
      TkTextChanged(textPtr, &index1, &index2);
      resetView = 0;
      line = 0;
      byteIndex = 0;
      if (TkTextIndexCmp(&index2, &textPtr->topIndex) >= 0) {
          if (TkTextIndexCmp(&index1, &textPtr->topIndex) <= 0) {
              /*
               * Deletion range straddles topIndex: use the beginning
               * of the range as the new topIndex.
               */
              resetView = 1;
              line = line1;
              byteIndex = index1.byteIndex;
          } else if (index1.linePtr == textPtr->topIndex.linePtr) {
              /*
               * Deletion range starts on top line but after topIndex.
               * Use the current topIndex as the new one.
               */
              resetView = 1;
              line = line1;
              byteIndex = textPtr->topIndex.byteIndex;
          }
      } else if (index2.linePtr == textPtr->topIndex.linePtr) {
          /*
           * Deletion range ends on top line but before topIndex.
           * Figure out what will be the new character index for
           * the character currently pointed to by topIndex.
           */
          resetView = 1;
          line = line2;
          byteIndex = textPtr->topIndex.byteIndex;
          if (index1.linePtr != index2.linePtr) {
              byteIndex -= index2.byteIndex;
          } else {
              byteIndex -= (index2.byteIndex - index1.byteIndex);
          }
      }
      TkBTreeDeleteChars(&index1, &index2);
      if (resetView) {
          TkTextMakeByteIndex(textPtr->tree, line, byteIndex, &index1);
          TkTextSetYView(textPtr, &index1, 0);
      }
      /*
       * Invalidate any selection retrievals in progress.
       */
      textPtr->abortSelections = 1;
      return TCL_OK;
  }
  /*
   *----------------------------------------------------------------------
   *
   * TextFetchSelection --
   *
   *      This procedure is called back by Tk when the selection is
   *      requested by someone.  It returns part or all of the selection
   *      in a buffer provided by the caller.
   *
   * Results:
   *      The return value is the number of non-NULL bytes stored
   *      at buffer.  Buffer is filled (or partially filled) with a
   *      NULL-terminated string containing part or all of the selection,
   *      as given by offset and maxBytes.
   *
   * Side effects:
   *      None.
   *
   *----------------------------------------------------------------------
   */
  static int
  TextFetchSelection(clientData, offset, buffer, maxBytes)
      ClientData clientData;              /* Information about text widget. */
      int offset;                         /* Offset within selection of first
                                           * character to be returned. */
      char *buffer;                       /* Location in which to place
                                           * selection. */
      int maxBytes;                       /* Maximum number of bytes to place
                                           * at buffer, not including terminating
                                           * NULL character. */
  {
      register TkText *textPtr = (TkText *) clientData;
      TkTextIndex eof;
      int count, chunkSize, offsetInSeg;
      TkTextSearch search;
      TkTextSegment *segPtr;
      if (!textPtr->exportSelection) {
          return -1;
      }
      /*
       * Find the beginning of the next range of selected text.  Note:  if
       * the selection is being retrieved in multiple pieces (offset != 0)
       * and some modification has been made to the text that affects the
       * selection then reject the selection request (make 'em start over
       * again).
       */
      if (offset == 0) {
          TkTextMakeByteIndex(textPtr->tree, 0, 0, &textPtr->selIndex);
          textPtr->abortSelections = 0;
      } else if (textPtr->abortSelections) {
          return 0;
      }
      TkTextMakeByteIndex(textPtr->tree, TkBTreeNumLines(textPtr->tree), 0, &eof);
      TkBTreeStartSearch(&textPtr->selIndex, &eof, textPtr->selTagPtr, &search);
      if (!TkBTreeCharTagged(&textPtr->selIndex, textPtr->selTagPtr)) {
          if (!TkBTreeNextTag(&search)) {
              if (offset == 0) {
                  return -1;
              } else {
                  return 0;
              }
          }
          textPtr->selIndex = search.curIndex;
      }
      /*
       * Each iteration through the outer loop below scans one selected range.
       * Each iteration through the inner loop scans one segment in the
       * selected range.
       */
      count = 0;
      while (1) {
          /*
           * Find the end of the current range of selected text.
           */
          if (!TkBTreeNextTag(&search)) {
              panic("TextFetchSelection couldn't find end of range");
          }
          /*
           * Copy information from character segments into the buffer
           * until either we run out of space in the buffer or we get
           * to the end of this range of text.
           */
          while (1) {
              if (maxBytes == 0) {
                  goto done;
              }
              segPtr = TkTextIndexToSeg(&textPtr->selIndex, &offsetInSeg);
              chunkSize = segPtr->size - offsetInSeg;
              if (chunkSize > maxBytes) {
                  chunkSize = maxBytes;
              }
              if (textPtr->selIndex.linePtr == search.curIndex.linePtr) {
                  int leftInRange;
                  leftInRange = search.curIndex.byteIndex
                          - textPtr->selIndex.byteIndex;
                  if (leftInRange < chunkSize) {
                      chunkSize = leftInRange;
                      if (chunkSize <= 0) {
                          break;
                      }
                  }
              }
              if ((segPtr->typePtr == &tkTextCharType)
                      && !TkTextIsElided(textPtr, &textPtr->selIndex)) {
                  memcpy((VOID *) buffer, (VOID *) (segPtr->body.chars
                          + offsetInSeg), (size_t) chunkSize);
                  buffer += chunkSize;
                  maxBytes -= chunkSize;
                  count += chunkSize;
              }
              TkTextIndexForwBytes(&textPtr->selIndex, chunkSize,
                      &textPtr->selIndex);
          }
          /*
           * Find the beginning of the next range of selected text.
           */
          if (!TkBTreeNextTag(&search)) {
              break;
          }
          textPtr->selIndex = search.curIndex;
      }
      done:
      *buffer = 0;
      return count;
  }
  /*
   *----------------------------------------------------------------------
   *
   * TkTextLostSelection --
   *
   *      This procedure is called back by Tk when the selection is
   *      grabbed away from a text widget.  On Windows and Mac systems, we
   *      want to remember the selection for the next time the focus
   *      enters the window.  On Unix, just remove the "sel" tag from
   *      everything in the widget.
   *
   * Results:
   *      None.
   *
   * Side effects:
   *      The "sel" tag is cleared from the window.
   *
   *----------------------------------------------------------------------
   */
  void
  TkTextLostSelection(clientData)
      ClientData clientData;              /* Information about text widget. */
  {
      register TkText *textPtr = (TkText *) clientData;
  #ifdef ALWAYS_SHOW_SELECTION
      TkTextIndex start, end;
      if (!textPtr->exportSelection) {
          return;
      }
      /*
       * On Windows and Mac systems, we want to remember the selection
       * for the next time the focus enters the window.  On Unix,
       * just remove the "sel" tag from everything in the widget.
       */
      TkTextMakeByteIndex(textPtr->tree, 0, 0, &start);
      TkTextMakeByteIndex(textPtr->tree, TkBTreeNumLines(textPtr->tree), 0, &end);
      TkTextRedrawTag(textPtr, &start, &end, textPtr->selTagPtr, 1);
      TkBTreeTag(&start, &end, textPtr->selTagPtr, 0);
  #endif
      textPtr->flags &= ~GOT_SELECTION;
  }
  /*
   *----------------------------------------------------------------------
   *
   * TextBlinkProc --
   *
   *      This procedure is called as a timer handler to blink the
   *      insertion cursor off and on.
   *
   * Results:
   *      None.
   *
   * Side effects:
   *      The cursor gets turned on or off, redisplay gets invoked,
   *      and this procedure reschedules itself.
   *
   *----------------------------------------------------------------------
   */
  static void
  TextBlinkProc(clientData)
      ClientData clientData;      /* Pointer to record describing text. */
  {
      register TkText *textPtr = (TkText *) clientData;
      TkTextIndex index;
      int x, y, w, h;
      if ((textPtr->state == TK_STATE_DISABLED) ||
              !(textPtr->flags & GOT_FOCUS) || (textPtr->insertOffTime == 0)) {
          return;
      }
      if (textPtr->flags & INSERT_ON) {
          textPtr->flags &= ~INSERT_ON;
          textPtr->insertBlinkHandler = Tcl_CreateTimerHandler(
                  textPtr->insertOffTime, TextBlinkProc, (ClientData) textPtr);
      } else {
          textPtr->flags |= INSERT_ON;
          textPtr->insertBlinkHandler = Tcl_CreateTimerHandler(
                  textPtr->insertOnTime, TextBlinkProc, (ClientData) textPtr);
      }
      TkTextMarkSegToIndex(textPtr, textPtr->insertMarkPtr, &index);
      TkTextCharBbox(textPtr, &index, &x, &y, &w, &h);
      TkTextRedrawRegion(textPtr, x - textPtr->insertWidth / 2, y,
              textPtr->insertWidth, h);
  }
  /*
   *----------------------------------------------------------------------
   *
   * TextSearchCmd --
   *
   *      This procedure is invoked to process the "search" widget command
   *      for text widgets.  See the user documentation for details on what
   *      it does.
   *
   * Results:
   *      A standard Tcl result.
   *
   * Side effects:
   *      See the user documentation.
   *
   *----------------------------------------------------------------------
   */
  static int
  TextSearchCmd(textPtr, interp, argc, argv)
      TkText *textPtr;            /* Information about text widget. */
      Tcl_Interp *interp;         /* Current interpreter. */
      int argc;                   /* Number of arguments. */
      char **argv;                /* Argument strings. */
  {
      int backwards, exact, searchElide, c, i, argsLeft, noCase, leftToScan;
      size_t length;
      int numLines, startingLine, startingByte, lineNum, firstByte, lastByte;
      int code, matchLength, matchByte, passes, stopLine, searchWholeText;
      int patLength;
      char *arg, *pattern, *varName, *p, *startOfLine;
      char buffer[20];
      TkTextIndex index, stopIndex;
      Tcl_DString line, patDString;
      TkTextSegment *segPtr;
      TkTextLine *linePtr;
      TkTextIndex curIndex;
      Tcl_RegExp regexp = NULL;           /* Initialization needed only to
                                           * prevent compiler warning. */
      /*
       * Parse switches and other arguments.
       */
      exact = 1;
      searchElide = 0;
      curIndex.tree = textPtr->tree;
      backwards = 0;
      noCase = 0;
      varName = NULL;
      for (i = 2; i < argc; i++) {
          arg = argv[i];
          if (arg[0] != '-') {
              break;
          }
          length = strlen(arg);
          if (length < 2) {
              badSwitch:
              Tcl_AppendResult(interp, "bad switch \"", arg,
                      "\": must be --, -backward, -count, -elide, -exact, ",
                      "-forward, -nocase, or -regexp", (char *) NULL);
              return TCL_ERROR;
          }
          c = arg[1];
          if ((c == 'b') && (strncmp(argv[i], "-backwards", length) == 0)) {
              backwards = 1;
          } else if ((c == 'c') && (strncmp(argv[i], "-count", length) == 0)) {
              if (i >= (argc-1)) {
                  Tcl_SetResult(interp, "no value given for \"-count\" option",
                          TCL_STATIC);
                  return TCL_ERROR;
              }
              i++;
              varName = argv[i];
          } else if ((c == 'e') && (length > 2)
                  && (strncmp(argv[i], "-exact", length) == 0)) {
              exact = 1;
          } else if ((c == 'e') && (length > 2)
                  && (strncmp(argv[i], "-elide", length) == 0)) {
              searchElide = 1;
          } else if ((c == 'h') && (strncmp(argv[i], "-hidden", length) == 0)) {
              /*
               * -hidden is kept around for backwards compatibility with
               * the dash patch, but -elide is the official option
               */
              searchElide = 1;
          } else if ((c == 'f') && (strncmp(argv[i], "-forwards", length) == 0)) {
              backwards = 0;
          } else if ((c == 'n') && (strncmp(argv[i], "-nocase", length) == 0)) {
              noCase = 1;
          } else if ((c == 'r') && (strncmp(argv[i], "-regexp", length) == 0)) {
              exact = 0;
          } else if ((c == '-') && (strncmp(argv[i], "--", length) == 0)) {
              i++;
              break;
          } else {
              goto badSwitch;
          }
      }
      argsLeft = argc - (i+2);
      if ((argsLeft != 0) && (argsLeft != 1)) {
          Tcl_AppendResult(interp, "wrong # args: should be \"",
                  argv[0], " search ?switches? pattern index ?stopIndex?\"",
                  (char *) NULL);
          return TCL_ERROR;
      }
      pattern = argv[i];
      /*
       * Convert the pattern to lower-case if we're supposed to ignore case.
       */
      if (noCase) {
          Tcl_DStringInit(&patDString);
          Tcl_DStringAppend(&patDString, pattern, -1);
          pattern = Tcl_DStringValue(&patDString);
          Tcl_UtfToLower(pattern);
      }
      Tcl_DStringInit(&line);
      if (TkTextGetIndex(interp, textPtr, argv[i+1], &index) != TCL_OK) {
          code = TCL_ERROR;
          goto done;
      }
      numLines = TkBTreeNumLines(textPtr->tree);
      startingLine = TkBTreeLineIndex(index.linePtr);
      startingByte = index.byteIndex;
      if (startingLine >= numLines) {
          if (backwards) {
              startingLine = TkBTreeNumLines(textPtr->tree) - 1;
              startingByte = TkBTreeBytesInLine(TkBTreeFindLine(textPtr->tree,
                      startingLine));
          } else {
              startingLine = 0;
              startingByte = 0;
          }
      }
      if (argsLeft == 1) {
          if (TkTextGetIndex(interp, textPtr, argv[i+2], &stopIndex) != TCL_OK) {
              code = TCL_ERROR;
              goto done;
          }
          stopLine = TkBTreeLineIndex(stopIndex.linePtr);
          if (!backwards && (stopLine == numLines)) {
              stopLine = numLines-1;
          }
          searchWholeText = 0;
      } else {
          stopLine = 0;
          searchWholeText = 1;
      }
      /*
       * Scan through all of the lines of the text circularly, starting
       * at the given index.
       */
      matchLength = patLength = 0;        /* Only needed to prevent compiler
                                           * warnings. */
      if (exact) {
          patLength = strlen(pattern);
      } else {
          regexp = Tcl_RegExpCompile(interp, pattern);
          if (regexp == NULL) {
              code = TCL_ERROR;
              goto done;
          }
      }
      lineNum = startingLine;
      code = TCL_OK;
      for (passes = 0; passes < 2; ) {
          if (lineNum >= numLines) {
              /*
               * Don't search the dummy last line of the text.
               */
              goto nextLine;
          }
          /*
           * Extract the text from the line.  If we're doing regular
           * expression matching, drop the newline from the line, so
           * that "$" can be used to match the end of the line.
           */
          linePtr = TkBTreeFindLine(textPtr->tree, lineNum);
          curIndex.linePtr = linePtr; curIndex.byteIndex = 0;
          for (segPtr = linePtr->segPtr; segPtr != NULL;
                  curIndex.byteIndex += segPtr->size, segPtr = segPtr->nextPtr) {
              if ((segPtr->typePtr != &tkTextCharType)
                      || (!searchElide && TkTextIsElided(textPtr, &curIndex))) {
                  continue;
              }
              Tcl_DStringAppend(&line, segPtr->body.chars, segPtr->size);
          }
          if (!exact) {
              Tcl_DStringSetLength(&line, Tcl_DStringLength(&line)-1);
          }
          startOfLine = Tcl_DStringValue(&line);
          /*
           * If we're ignoring case, convert the line to lower case.
           */
          if (noCase) {
              Tcl_DStringSetLength(&line,
                      Tcl_UtfToLower(Tcl_DStringValue(&line)));
          }
          /*
           * Check for matches within the current line.  If so, and if we're
           * searching backwards, repeat the search to find the last match
           * in the line.  (Note: The lastByte should include the NULL char
           * so we can handle searching for end of line easier.)
           */
          matchByte = -1;
          firstByte = 0;
          lastByte = Tcl_DStringLength(&line) + 1;
          if (lineNum == startingLine) {
              int indexInDString;
              /*
               * The starting line is tricky: the first time we see it
               * we check one part of the line, and the second pass through
               * we check the other part of the line.  We have to be very
               * careful here because there could be embedded windows or
               * other things that are not in the extracted line.  Rescan
               * the original line to compute the index in it of the first
               * character.
               */
              indexInDString = startingByte;
              for (segPtr = linePtr->segPtr, leftToScan = startingByte;
                      leftToScan > 0; segPtr = segPtr->nextPtr) {
                  if (segPtr->typePtr != &tkTextCharType) {
                      indexInDString -= segPtr->size;
                  }
                  leftToScan -= segPtr->size;
              }
              passes++;
              if ((passes == 1) ^ backwards) {
                  /*
                   * Only use the last part of the line.
                   */
                  firstByte = indexInDString;
                  if ((firstByte >= Tcl_DStringLength(&line))
                          && !((Tcl_DStringLength(&line) == 0) && !exact)) {
                      goto nextLine;
                  }
              } else {
                  /*
                   * Use only the first part of the line.
                   */
                  lastByte = indexInDString;
              }
          }
          do {
              int thisLength;
              Tcl_UniChar ch;
              if (exact) {
                  p = strstr(startOfLine + firstByte,     /* INTL: Native. */
                          pattern);
                  if (p == NULL) {
                      break;
                  }
                  i = p - startOfLine;
                  thisLength = patLength;
              } else {
                  char *start, *end;
                  int match;
                  match = Tcl_RegExpExec(interp, regexp,
                          startOfLine + firstByte, startOfLine);
                  if (match < 0) {
                      code = TCL_ERROR;
                      goto done;
                  }
                  if (!match) {
                      break;
                  }
                  Tcl_RegExpRange(regexp, 0, &start, &end);
                  i = start - startOfLine;
                  thisLength = end - start;
              }
              if (i >= lastByte) {
                  break;
              }
              matchByte = i;
              matchLength = thisLength;
              firstByte = i + Tcl_UtfToUniChar(startOfLine + matchByte, &ch);
          } while (backwards);
          /*
           * If we found a match then we're done.  Make sure that
           * the match occurred before the stopping index, if one was
           * specified.
           */
          if (matchByte >= 0) {
              int numChars;
              /*
               * Convert the byte length to a character count.
               */
              numChars = Tcl_NumUtfChars(startOfLine + matchByte,
                      matchLength);
              /*
               * The index information returned by the regular expression
               * parser only considers textual information:  it doesn't
               * account for embedded windows or any other non-textual info.
               * Scan through the line's segments again to adjust both
               * matchChar and matchCount.
               */
              for (segPtr = linePtr->segPtr, leftToScan = matchByte;
                      leftToScan >= 0; segPtr = segPtr->nextPtr) {
                  if (segPtr->typePtr != &tkTextCharType) {
                      matchByte += segPtr->size;
                      continue;
                  }
                  leftToScan -= segPtr->size;
              }
              for (leftToScan += matchLength; leftToScan > 0;
                      segPtr = segPtr->nextPtr) {
                  if (segPtr->typePtr != &tkTextCharType) {
                      numChars += segPtr->size;
                      continue;
                  }
                  leftToScan -= segPtr->size;
              }
              TkTextMakeByteIndex(textPtr->tree, lineNum, matchByte, &index);
              if (!searchWholeText) {
                  if (!backwards && (TkTextIndexCmp(&index, &stopIndex) >= 0)) {
                      goto done;
                  }
                  if (backwards && (TkTextIndexCmp(&index, &stopIndex) < 0)) {
                      goto done;
                  }
              }
              if (varName != NULL) {
                  sprintf(buffer, "%d", numChars);
                  if (Tcl_SetVar(interp, varName, buffer, TCL_LEAVE_ERR_MSG)
                          == NULL) {
                      code = TCL_ERROR;
                      goto done;
                  }
              }
              TkTextPrintIndex(&index, buffer);
              Tcl_SetResult(interp, buffer, TCL_VOLATILE);
              goto done;
          }
          /*
           * Go to the next (or previous) line;
           */
          nextLine:
          if (backwards) {
              lineNum--;
              if (!searchWholeText) {
                  if (lineNum < stopLine) {
                      break;
                  }
              } else if (lineNum < 0) {
                  lineNum = numLines-1;
              }
          } else {
              lineNum++;
              if (!searchWholeText) {
                  if (lineNum > stopLine) {
                      break;
                  }
              } else if (lineNum >= numLines) {
                  lineNum = 0;
              }
          }
          Tcl_DStringSetLength(&line, 0);
      }
      done:
      Tcl_DStringFree(&line);
      if (noCase) {
          Tcl_DStringFree(&patDString);
      }
      return code;
  }
  /*
   *----------------------------------------------------------------------
   *
   * TkTextGetTabs --
   *
   *      Parses a string description of a set of tab stops.
   *
   * Results:
   *      The return value is a pointer to a malloc'ed structure holding
   *      parsed information about the tab stops.  If an error occurred
   *      then the return value is NULL and an error message is left in
   *      the interp's result.
   *
   * Side effects:
   *      Memory is allocated for the structure that is returned.  It is
   *      up to the caller to free this structure when it is no longer
   *      needed.
   *
   *----------------------------------------------------------------------
   */
  TkTextTabArray *
  TkTextGetTabs(interp, tkwin, string)
      Tcl_Interp *interp;                 /* Used for error reporting. */
      Tk_Window tkwin;                    /* Window in which the tabs will be
                                           * used. */
      char *string;                       /* Description of the tab stops.  See
                                           * the text manual entry for details. */
  {
      int argc, i, count, c;
      char **argv;
      TkTextTabArray *tabArrayPtr;
      TkTextTab *tabPtr;
      Tcl_UniChar ch;
      if (Tcl_SplitList(interp, string, &argc, &argv) != TCL_OK) {
          return NULL;
      }
      /*
       * First find out how many entries we need to allocate in the
       * tab array.
       */
      count = 0;
      for (i = 0; i < argc; i++) {
          c = argv[i][0];
          if ((c != 'l') && (c != 'r') && (c != 'c') && (c != 'n')) {
              count++;
          }
      }
      /*
       * Parse the elements of the list one at a time to fill in the
       * array.
       */
      tabArrayPtr = (TkTextTabArray *) ckalloc((unsigned)
              (sizeof(TkTextTabArray) + (count-1)*sizeof(TkTextTab)));
      tabArrayPtr->numTabs = 0;
      for (i = 0, tabPtr = &tabArrayPtr->tabs[0]; i  < argc; i++, tabPtr++) {
          if (Tk_GetPixels(interp, tkwin, argv[i], &tabPtr->location)
                  != TCL_OK) {
              goto error;
          }
          tabArrayPtr->numTabs++;
          /*
           * See if there is an explicit alignment in the next list
           * element.  Otherwise just use "left".
           */
          tabPtr->alignment = LEFT;
          if ((i+1) == argc) {
              continue;
          }
          Tcl_UtfToUniChar(argv[i+1], &ch);
          if (!Tcl_UniCharIsAlpha(ch)) {
              continue;
          }
          i += 1;
          c = argv[i][0];
          if ((c == 'l') && (strncmp(argv[i], "left",
                  strlen(argv[i])) == 0)) {
              tabPtr->alignment = LEFT;
          } else if ((c == 'r') && (strncmp(argv[i], "right",
                  strlen(argv[i])) == 0)) {
              tabPtr->alignment = RIGHT;
          } else if ((c == 'c') && (strncmp(argv[i], "center",
                  strlen(argv[i])) == 0)) {
              tabPtr->alignment = CENTER;
          } else if ((c == 'n') && (strncmp(argv[i],
                  "numeric", strlen(argv[i])) == 0)) {
              tabPtr->alignment = NUMERIC;
          } else {
              Tcl_AppendResult(interp, "bad tab alignment \"",
                      argv[i], "\": must be left, right, center, or numeric",
                      (char *) NULL);
              goto error;
          }
      }
      ckfree((char *) argv);
      return tabArrayPtr;
      error:
      ckfree((char *) tabArrayPtr);
      ckfree((char *) argv);
      return NULL;
  }
  /*
   *----------------------------------------------------------------------
   *
   * TextDumpCmd --
   *
   *      Return information about the text, tags, marks, and embedded windows
   *      and images in a text widget.  See the man page for the description
   *      of the text dump operation for all the details.
   *
   * Results:
   *      A standard Tcl result.
   *
   * Side effects:
   *      Memory is allocated for the result, if needed (standard Tcl result
   *      side effects).
   *
   *----------------------------------------------------------------------
   */
  static int
  TextDumpCmd(textPtr, interp, argc, argv)
      register TkText *textPtr;   /* Information about text widget. */
      Tcl_Interp *interp;         /* Current interpreter. */
      int argc;                   /* Number of arguments. */
      char **argv;                /* Argument strings.  Someone else has already
                                   * parsed this command enough to know that
                                   * argv[1] is "dump". */
  {
      TkTextIndex index1, index2;
      int arg;
      int lineno;                 /* Current line number */
      int what = 0;               /* bitfield to select segment types */
      int atEnd;                  /* True if dumping up to logical end */
      TkTextLine *linePtr;
      char *command = NULL;       /* Script callback to apply to segments */
  #define TK_DUMP_TEXT    0x1
  #define TK_DUMP_MARK    0x2
  #define TK_DUMP_TAG     0x4
  #define TK_DUMP_WIN     0x8
  #define TK_DUMP_IMG     0x10
  #define TK_DUMP_ALL     (TK_DUMP_TEXT|TK_DUMP_MARK|TK_DUMP_TAG| \
          TK_DUMP_WIN|TK_DUMP_IMG)
      for (arg=2 ; argv[arg] != (char *) NULL ; arg++) {
          size_t len;
          if (argv[arg][0] != '-') {
              break;
          }
          len = strlen(argv[arg]);
          if (strncmp("-all", argv[arg], len) == 0) {
              what = TK_DUMP_ALL;
          } else if (strncmp("-text", argv[arg], len) == 0) {
              what |= TK_DUMP_TEXT;
          } else if (strncmp("-tag", argv[arg], len) == 0) {
              what |= TK_DUMP_TAG;
          } else if (strncmp("-mark", argv[arg], len) == 0) {
              what |= TK_DUMP_MARK;
          } else if (strncmp("-image", argv[arg], len) == 0) {
              what |= TK_DUMP_IMG;
          } else if (strncmp("-window", argv[arg], len) == 0) {
              what |= TK_DUMP_WIN;
          } else if (strncmp("-command", argv[arg], len) == 0) {
              arg++;
              if (arg >= argc) {
                  Tcl_AppendResult(interp, "Usage: ", argv[0], " dump ?-all -image -text -mark -tag -window? ?-command script? index ?index2?", NULL);
                  return TCL_ERROR;
              }
              command = argv[arg];
          } else {
              Tcl_AppendResult(interp, "Usage: ", argv[0], " dump ?-all -image -text -mark -tag -window? ?-command script? index ?index2?", NULL);
              return TCL_ERROR;
          }
      }
      if (arg >= argc) {
          Tcl_AppendResult(interp, "Usage: ", argv[0], " dump ?-all -image -text -mark -tag -window? ?-command script? index ?index2?", NULL);
          return TCL_ERROR;
      }
      if (what == 0) {
          what = TK_DUMP_ALL;
      }
      if (TkTextGetIndex(interp, textPtr, argv[arg], &index1) != TCL_OK) {
          return TCL_ERROR;
      }
      lineno = TkBTreeLineIndex(index1.linePtr);
      arg++;
      atEnd = 0;
      if (argc == arg) {
          TkTextIndexForwChars(&index1, 1, &index2);
      } else {
          if (TkTextGetIndex(interp, textPtr, argv[arg], &index2) != TCL_OK) {
              return TCL_ERROR;
          }
          if (strncmp(argv[arg], "end", strlen(argv[arg])) == 0) {
              atEnd = 1;
          }
      }
      if (TkTextIndexCmp(&index1, &index2) >= 0) {
          return TCL_OK;
      }
      if (index1.linePtr == index2.linePtr) {
          DumpLine(interp, textPtr, what, index1.linePtr,
              index1.byteIndex, index2.byteIndex, lineno, command);
      } else {
          DumpLine(interp, textPtr, what, index1.linePtr,
                  index1.byteIndex, 32000000, lineno, command);
          linePtr = index1.linePtr;
          while ((linePtr = TkBTreeNextLine(linePtr)) != (TkTextLine *)NULL) {
              lineno++;
              if (linePtr == index2.linePtr) {
                  break;
              }
              DumpLine(interp, textPtr, what, linePtr, 0, 32000000,
                      lineno, command);
          }
          DumpLine(interp, textPtr, what, index2.linePtr, 0,
                  index2.byteIndex, lineno, command);
      }
      /*
       * Special case to get the leftovers hiding at the end mark.
       */
      if (atEnd) {
          DumpLine(interp, textPtr, what & ~TK_DUMP_TEXT, index2.linePtr,
 , 1, lineno, command);
      }
      return TCL_OK;
  }
  /*
   * DumpLine
   *      Return information about a given text line from character
   *      position "start" up to, but not including, "end".
   *
   * Results:
   *      A standard Tcl result.
   *
   * Side effects:
   *      None, but see DumpSegment.
   */
  static void
  DumpLine(interp, textPtr, what, linePtr, startByte, endByte, lineno, command)
      Tcl_Interp *interp;
      TkText *textPtr;
      int what;                   /* bit flags to select segment types */
      TkTextLine *linePtr;        /* The current line */
      int startByte, endByte;     /* Byte range to dump */
      int lineno;                 /* Line number for indices dump */
      char *command;              /* Script to apply to the segment */
  {
      int offset;
      TkTextSegment *segPtr;
      TkTextIndex index;
      /*
       * Must loop through line looking at its segments.
       * character
       * toggleOn, toggleOff
       * mark
       * image
       * window
       */
      for (offset = 0, segPtr = linePtr->segPtr ;
              (offset < endByte) && (segPtr != (TkTextSegment *)NULL) ;
              offset += segPtr->size, segPtr = segPtr->nextPtr) {
          if ((what & TK_DUMP_TEXT) && (segPtr->typePtr == &tkTextCharType) &&
                  (offset + segPtr->size > startByte)) {
              char savedChar;                     /* Last char used in the seg */
              int last = segPtr->size;            /* Index of savedChar */
              int first = 0;                      /* Index of first char in seg */
              if (offset + segPtr->size > endByte) {
                  last = endByte - offset;
              }
              if (startByte > offset) {
                  first = startByte - offset;
              }
              savedChar = segPtr->body.chars[last];
              segPtr->body.chars[last] = '\0';
              TkTextMakeByteIndex(textPtr->tree, lineno, offset + first, &index);
              DumpSegment(interp, "text", segPtr->body.chars + first,
                      command, &index, what);
              segPtr->body.chars[last] = savedChar;
          } else if ((offset >= startByte)) {
              if ((what & TK_DUMP_MARK) && (segPtr->typePtr->name[0] == 'm')) {
                  TkTextMark *markPtr = (TkTextMark *)&segPtr->body;
                  char *name = Tcl_GetHashKey(&textPtr->markTable, markPtr->hPtr);
                  TkTextMakeByteIndex(textPtr->tree, lineno, offset, &index);
                  DumpSegment(interp, "mark", name, command, &index, what);
              } else if ((what & TK_DUMP_TAG) &&
                          (segPtr->typePtr == &tkTextToggleOnType)) {
                  TkTextMakeByteIndex(textPtr->tree, lineno, offset, &index);
                  DumpSegment(interp, "tagon",
                          segPtr->body.toggle.tagPtr->name,
                          command, &index, what);
              } else if ((what & TK_DUMP_TAG) &&
                          (segPtr->typePtr == &tkTextToggleOffType)) {
                  TkTextMakeByteIndex(textPtr->tree, lineno, offset, &index);
                  DumpSegment(interp, "tagoff",
                          segPtr->body.toggle.tagPtr->name,
                          command, &index, what);
              } else if ((what & TK_DUMP_IMG) &&
                          (segPtr->typePtr->name[0] == 'i')) {
                  TkTextEmbImage *eiPtr = (TkTextEmbImage *)&segPtr->body;
                  char *name = (eiPtr->name ==  NULL) ? "" : eiPtr->name;
                  TkTextMakeByteIndex(textPtr->tree, lineno, offset, &index);
                  DumpSegment(interp, "image", name,
                          command, &index, what);
              } else if ((what & TK_DUMP_WIN) &&
                          (segPtr->typePtr->name[0] == 'w')) {
                  TkTextEmbWindow *ewPtr = (TkTextEmbWindow *)&segPtr->body;
                  char *pathname;
                  if (ewPtr->tkwin == (Tk_Window) NULL) {
                      pathname = "";
                  } else {
                      pathname = Tk_PathName(ewPtr->tkwin);
                  }
                  TkTextMakeByteIndex(textPtr->tree, lineno, offset, &index);
                  DumpSegment(interp, "window", pathname,
                          command, &index, what);
              }
          }
      }
  }
  /*
   * DumpSegment
   *      Either append information about the current segment to the result,
   *      or make a script callback with that information as arguments.
   *
   * Results:
   *      None
   *
   * Side effects:
   *      Either evals the callback or appends elements to the result string.
   */
  static int
  DumpSegment(interp, key, value, command, index, what)
      Tcl_Interp *interp;
      char *key;                  /* Segment type key */
      char *value;                /* Segment value */
      char *command;              /* Script callback */
      TkTextIndex *index;         /* index with line/byte position info */
      int what;                   /* Look for TK_DUMP_INDEX bit */
  {
      char buffer[TCL_INTEGER_SPACE*2];
      TkTextPrintIndex(index, buffer);
      if (command == (char *) NULL) {
          Tcl_AppendElement(interp, key);
          Tcl_AppendElement(interp, value);
          Tcl_AppendElement(interp, buffer);
          return TCL_OK;
      } else {
          char *argv[4];
          char *list;
          int result;
          argv[0] = key;
          argv[1] = value;
          argv[2] = buffer;
          argv[3] = (char *) NULL;
          list = Tcl_Merge(3, argv);
          result = Tcl_VarEval(interp, command, " ", list, (char *) NULL);
          ckfree(list);
          return result;
      }
  }
  /* End of tktext.c */

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