/[dtapublic]/to_be_filed/webprojs/php_libraries/php_lib_ceqswdev_com/strfunc.inc
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Revision 35 - (show annotations) (download)
Sat Oct 8 23:35:33 2016 UTC (6 years, 3 months ago) by dashley
File size: 8623 byte(s)
Initial commit.
1 <?php
2 //********************************************************************************
3 //Copyright (C) 2007 David T. Ashley
4 //********************************************************************************
5 //This program or source file is free software; you can redistribute it and/or
6 //modify it under the terms of the GNU Lesser General Public License as published
7 //by the Free Software Foundation; either version 2 of the License, or (at your
8 //option) any later version.
9 //
10 //This program or source file is distributed in the hope that it will
11 //be useful, but WITHOUT ANY WARRANTY; without even the implied warranty of
12 //MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
13 //GNU General Public License for more details.
14 //
15 //You may have received a copy of the GNU Lesser General Public License
16 //along with this program; if not, write to the Free Software
17 //Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
18 //********************************************************************************
19 //Utility functions that operate on strings.
20 //--------------------------------------------------------------------------------
21 //Pads a string on the left by zero until it reaches the
22 //target length. If the string is longer than the target length,
23 //it is truncated on the left.
24 //
25 //Unit tested 20060408.
26 //
27 function STRFUNC_pad_left_zero($str_in, $target_len)
28 {
29 if ($target_len >= 0) //Ignore invalid targets
30 {
31 $len = strlen($str_in);
32
33 if ($target_len == 0)
34 {
35 $str_in = "";
36 }
37 else if ($len < $target_len)
38 {
39 //The input string is too short. Pad it on the left with zeros.
40 $to_add = $target_len - $len;
41 for ($i = 0; $i < $to_add; $i++)
42 {
43 $str_in = "0". $str_in;
44 }
45 }
46 else if ($len > $target_len)
47 {
48 //The input string is too long. Remove the extra characters.
49 $to_remove = $len - $target_len;
50
51 $str_in = substr($str_in, $to_remove);
52 }
53 //In the final omitted else case, there is length equality, and hence nothing to do.
54 }
55
56 return($str_in);
57 }
58 //
59 //
60 //--------------------------------------------------------------------------------
61 //Returns 1 if the string is purely digits '0'-'9', or 0 otherwise.
62 //
63 //Unit tested 20060408.
64 //
65 function STRFUNC_is_pure_digits($arg)
66 {
67 //Must be a string.
68 if (! is_string($arg))
69 return(0);
70
71 $len = strlen($arg);
72
73 for ($i=0; $i<$len; $i++)
74 {
75 $c = SubStr($arg, $i, 1);
76 if (strpos("0123456789", $c) === FALSE)
77 return(0);
78 }
79
80 return(1);
81 }
82 //
83 //
84 //--------------------------------------------------------------------------------
85 //Returns 1 if each character in the subset is present in the set, i.e.
86 //if it is a proper or improper subset, or 0 otherwise.
87 //
88 //Unit tested 20060408.
89 //
90 function STRFUNC_is_char_subset($conjectured_subset, $reference_set)
91 {
92 $conjsubsetlen = strlen($conjectured_subset);
93 $refsetlen = strlen($reference_set);
94
95 for ($i=0; $i<$conjsubsetlen; $i++)
96 {
97 $c = SubStr($conjectured_subset, $i, 1);
98
99 if (strpos($reference_set, $c) === FALSE)
100 return(0);
101 }
102
103 //If we've made it this far, no character has failed to pan out.
104 return(1);
105 }
106 //--------------------------------------------------------------------------------
107 //Removes all characters from the input that are not in the set of
108 //allowed characters.
109 //
110 function STRFUNC_force_into_subset($input, $subset)
111 {
112 $inputlen = strlen($input);
113 $subsetlen = strlen($subset);
114
115 $rv = "";
116 for ($i=0; $i<$inputlen; $i++)
117 {
118 $c = SubStr($input, $i, 1);
119
120 if (strpos($subset, $c) === FALSE)
121 {
122 //Character is not in the set. Do not add it to
123 //the result.
124 }
125 else
126 {
127 //Character is in the set. Add it.
128 $rv .= $c;
129 }
130 }
131
132 return($rv);
133 }
134 //
135 //--------------------------------------------------------------------------------
136 //Forces the variable to be a string, removes all characters from the input that
137 //are not in the set of allowed characters, then truncates the string if it is
138 //too long.
139 //
140 function STRFUNC_force_stringtype_subset_truncate($input, $subset, $maxlen)
141 {
142 //Force the type. Only numerics and strings can reliably be
143 //strings.
144 //
145 if (is_string($input))
146 {
147 //It is already a string. Do nothing.
148 }
149 else if (is_numeric($input))
150 {
151 //A number can be reliably made to a string.
152 $input = (string) $input;
153 }
154 else
155 {
156 //We don't know what it is. Make the empty string out of it.
157 $input = (string) "";
158 }
159
160 //Force it into the allowed character set.
161 $input = STRFUNC_force_into_subset($input, $subset);
162
163 //Take care of the length.
164 if (strlen($input) > $maxlen)
165 $input = SubStr($input, 0, $maxlen);
166
167 //echo " / " . $input . " / ";
168
169 return($input);
170 }
171 //
172 //--------------------------------------------------------------------------------
173 //For the passed string, will return a string of "&nbsp;"'s that approximately
174 //equals the length when displayed in a table.
175 //
176 function STRFUNC_nbsp_padding($arg)
177 {
178 $n = (int)(1.95 * strlen($arg));
179
180 $rv = "";
181
182 for ($i = 0; $i < $n; $i++)
183 {
184 $rv .= "&nbsp;";
185 }
186
187 return($rv);
188 }
189 //
190 //--------------------------------------------------------------------------------
191 //Escapes a JavaScript internal string that is delimited by single quotes.
192 //This allows the use of contractions and other constructs within the
193 //string.
194 //
195 //The string is not truncated in any way (it should be known in advance
196 //that the string is of a suitable length).
197 //
198 //This function is used to preprocess strings (usually from a database) that
199 //will occur embedded in JavaScript within single quotes.
200 //
201 function STRFUNC_js_escape_sglquote_notrunc($arg)
202 {
203 //Be sure no funky stuff in string.
204 $temp = STRFUNC_force_into_subset
205 (
206 $arg,
207 "abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ ;.,()<>{}:'\"-*+/0123456789"
208 );
209 //
210 //For each single quote in string, replace it with \'. For each double-quote,
211 //since I haven't figured out how to properly escape it, it is turned into an
212 //escaped single quote.
213 $rv = "";
214 $count = strlen($temp);
215 for ($i=0; $i<$count; $i++)
216 {
217 $c = SubStr($temp, $i, 1);
218 if ($c == "'")
219 $rv .= "\\'";
220 else if ($c == "\"")
221 $rv .= "\\'";
222 else
223 $rv .= $c;
224 }
225
226 return($rv);
227 }
228 //
229 //--------------------------------------------------------------------------------
230 //Escapes an HTML "title" string that is delimited by double quotes.
231 //This allows the use of quoted text and other constructs within the
232 //string.
233 //
234 //The string is not truncated in any way (it should be known in advance
235 //that the string is of a suitable length).
236 //
237 function STRFUNC_html_title_escape_dblquote_notrunc($arg)
238 {
239 //Be sure no funky stuff in string.
240 $temp = STRFUNC_force_into_subset
241 (
242 $arg,
243 "abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ ;.,()<>{}:'\"-*+/0123456789"
244 );
245 //
246 //For each double quote in string, replace it with \".
247 $rv = "";
248 $count = strlen($temp);
249 for ($i=0; $i<$count; $i++)
250 {
251 $c = SubStr($temp, $i, 1);
252 if ($c == "\"")
253 $rv .= "&quot;";
254 else
255 $rv .= $c;
256 }
257
258 return($rv);
259 }
260 //
261 //--------------------------------------------------------------------------------
262 //Creates a GET string (including the ?) that should be appended to a URL to
263 //pass the date and time.
264 //
265 function STRFUNC_datetime_get_url_trailer($sddt, $sdtim)
266 {
267 if (($sddt === FALSE) && ($sdtim === FALSE))
268 {
269 //Nothing to append.
270 return("");
271 }
272 else if (($sddt === FALSE) && ($sdtim !== FALSE))
273 {
274 //Time only.
275 return("?sdtim=" . $sdtim);
276 }
277 else if (($sddt !== FALSE) && ($sdtim === FALSE))
278 {
279 //Date only.
280 return("?sddt=" . $sddt);
281 }
282 else
283 {
284 //Both date and time.
285 return("?sddt=" . $sddt . "&sdtim=" . $sdtim);
286 }
287 }
288 ?>

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