summaryrefslogtreecommitdiffstats
path: root/system/helpers/text_helper.php
blob: cef32847d0dff3ce70b4a5a3a4838fa5dfa6ed01 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
488
489
490
491
492
493
494
495
496
497
498
499
500
501
502
503
504
505
506
507
508
509
510
511
512
513
514
515
516
517
518
519
520
521
522
523
524
525
526
527
528
529
530
531
532
533
534
535
536
537
538
<?php if ( ! defined('BASEPATH')) exit('No direct script access allowed');
/**
 * CodeIgniter
 *
 * An open source application development framework for PHP 5.1.6 or newer
 *
 * NOTICE OF LICENSE
 *
 * Licensed under the Open Software License version 3.0
 *
 * This source file is subject to the Open Software License (OSL 3.0) that is
 * bundled with this package in the files license.txt / license.rst.  It is
 * also available through the world wide web at this URL:
 * http://opensource.org/licenses/OSL-3.0
 * If you did not receive a copy of the license and are unable to obtain it
 * through the world wide web, please send an email to
 * licensing@ellislab.com so we can send you a copy immediately.
 *
 * @package		CodeIgniter
 * @author		EllisLab Dev Team
 * @copyright	Copyright (c) 2008 - 2012, EllisLab, Inc. (http://ellislab.com/)
 * @license		http://opensource.org/licenses/OSL-3.0 Open Software License (OSL 3.0)
 * @link		http://codeigniter.com
 * @since		Version 1.0
 * @filesource
 */

/**
 * CodeIgniter Text Helpers
 *
 * @package		CodeIgniter
 * @subpackage	Helpers
 * @category	Helpers
 * @author		EllisLab Dev Team
 * @link		http://codeigniter.com/user_guide/helpers/text_helper.html
 */

// ------------------------------------------------------------------------

/**
 * Word Limiter
 *
 * Limits a string to X number of words.
 *
 * @access	public
 * @param	string
 * @param	integer
 * @param	string	the end character. Usually an ellipsis
 * @return	string
 */
if ( ! function_exists('word_limiter'))
{
	function word_limiter($str, $limit = 100, $end_char = '&#8230;')
	{
		if (trim($str) == '')
		{
			return $str;
		}

		preg_match('/^\s*+(?:\S++\s*+){1,'.(int) $limit.'}/', $str, $matches);

		if (strlen($str) === strlen($matches[0]))
		{
			$end_char = '';
		}

		return rtrim($matches[0]).$end_char;
	}
}

// ------------------------------------------------------------------------

/**
 * Character Limiter
 *
 * Limits the string based on the character count.  Preserves complete words
 * so the character count may not be exactly as specified.
 *
 * @access	public
 * @param	string
 * @param	integer
 * @param	string	the end character. Usually an ellipsis
 * @return	string
 */
if ( ! function_exists('character_limiter'))
{
	function character_limiter($str, $n = 500, $end_char = '&#8230;')
	{
		if (strlen($str) < $n)
		{
			return $str;
		}

		$str = preg_replace('/\s+/', ' ', str_replace(array("\r\n", "\r", "\n"), ' ', $str));

		if (strlen($str) <= $n)
		{
			return $str;
		}

		$out = '';
		foreach (explode(' ', trim($str)) as $val)
		{
			$out .= $val.' ';

			if (strlen($out) >= $n)
			{
				$out = trim($out);
				return (strlen($out) === strlen($str)) ? $out : $out.$end_char;
			}
		}
	}
}

// ------------------------------------------------------------------------

/**
 * High ASCII to Entities
 *
 * Converts High ascii text and MS Word special characters to character entities
 *
 * @access	public
 * @param	string
 * @return	string
 */
if ( ! function_exists('ascii_to_entities'))
{
	function ascii_to_entities($str)
	{
		$count	= 1;
		$out	= '';
		$temp	= array();

		for ($i = 0, $s = strlen($str); $i < $s; $i++)
		{
			$ordinal = ord($str[$i]);

			if ($ordinal < 128)
			{
				/*
					If the $temp array has a value but we have moved on, then it seems only
					fair that we output that entity and restart $temp before continuing. -Paul
				*/
				if (count($temp) === 1)
				{
					$out  .= '&#'.array_shift($temp).';';
					$count = 1;
				}

				$out .= $str[$i];
			}
			else
			{
				if (count($temp) === 0)
				{
					$count = ($ordinal < 224) ? 2 : 3;
				}

				$temp[] = $ordinal;

				if (count($temp) === $count)
				{
					$number = ($count === 3)
							? (($temp[0] % 16) * 4096) + (($temp[1] % 64) * 64) + ($temp[2] % 64)
							: (($temp[0] % 32) * 64) + ($temp[1] % 64);

					$out .= '&#'.$number.';';
					$count = 1;
					$temp = array();
				}
			}
		}

		return $out;
	}
}

// ------------------------------------------------------------------------

/**
 * Entities to ASCII
 *
 * Converts character entities back to ASCII
 *
 * @access	public
 * @param	string
 * @param	bool
 * @return	string
 */
if ( ! function_exists('entities_to_ascii'))
{
	function entities_to_ascii($str, $all = TRUE)
	{
		if (preg_match_all('/\&#(\d+)\;/', $str, $matches))
		{
			for ($i = 0, $s = count($matches[0]); $i < $s; $i++)
			{
				$digits = $matches[1][$i];
				$out = '';

				if ($digits < 128)
				{
					$out .= chr($digits);

				}
				elseif ($digits < 2048)
				{
					$out .= chr(192 + (($digits - ($digits % 64)) / 64)).chr(128 + ($digits % 64));
				}
				else
				{
					$out .= chr(224 + (($digits - ($digits % 4096)) / 4096))
						.chr(128 + ((($digits % 4096) - ($digits % 64)) / 64))
						.chr(128 + ($digits % 64));
				}

				$str = str_replace($matches[0][$i], $out, $str);
			}
		}

		if ($all)
		{
			return str_replace(array('&amp;', '&lt;', '&gt;', '&quot;', '&apos;', '&#45;'),
						array('&', '<', '>', '"', "'", '-'),
						$str);
		}

		return $str;
	}
}

// ------------------------------------------------------------------------

/**
 * Word Censoring Function
 *
 * Supply a string and an array of disallowed words and any
 * matched words will be converted to #### or to the replacement
 * word you've submitted.
 *
 * @access	public
 * @param	string	the text string
 * @param	string	the array of censoered words
 * @param	string	the optional replacement value
 * @return	string
 */
if ( ! function_exists('word_censor'))
{
	function word_censor($str, $censored, $replacement = '')
	{
		if ( ! is_array($censored))
		{
			return $str;
		}

		$str = ' '.$str.' ';

		// \w, \b and a few others do not match on a unicode character
		// set for performance reasons. As a result words like über
		// will not match on a word boundary. Instead, we'll assume that
		// a bad word will be bookeneded by any of these characters.
		$delim = '[-_\'\"`(){}<>\[\]|!?@#%&,.:;^~*+=\/ 0-9\n\r\t]';

		foreach ($censored as $badword)
		{
			if ($replacement != '')
			{
				$str = preg_replace("/({$delim})(".str_replace('\*', '\w*?', preg_quote($badword, '/')).")({$delim})/i", "\\1{$replacement}\\3", $str);
			}
			else
			{
				$str = preg_replace("/({$delim})(".str_replace('\*', '\w*?', preg_quote($badword, '/')).")({$delim})/ie", "'\\1'.str_repeat('#', strlen('\\2')).'\\3'", $str);
			}
		}

		return trim($str);
	}
}

// ------------------------------------------------------------------------

/**
 * Code Highlighter
 *
 * Colorizes code strings
 *
 * @access	public
 * @param	string	the text string
 * @return	string
 */
if ( ! function_exists('highlight_code'))
{
	function highlight_code($str)
	{
		/* The highlight string function encodes and highlights
		 * brackets so we need them to start raw.
		 *
		 * Also replace any existing PHP tags to temporary markers
		 * so they don't accidentally break the string out of PHP,
		 * and thus, thwart the highlighting.
		 */
		$str = str_replace(array('&lt;', '&gt;', '<?', '?>', '<%', '%>', '\\', '</script>'),
					array('<', '>', 'phptagopen', 'phptagclose', 'asptagopen', 'asptagclose', 'backslashtmp', 'scriptclose'),
					$str);

		// The highlight_string function requires that the text be surrounded
		// by PHP tags, which we will remove later
		$str = highlight_string('<?php '.$str.' ?>', TRUE);

		// Remove our artificially added PHP, and the syntax highlighting that came with it
		$str = preg_replace(array(
						'/<span style="color: #([A-Z0-9]+)">&lt;\?php(&nbsp;| )/i',
						'/(<span style="color: #[A-Z0-9]+">.*?)\?&gt;<\/span>\n<\/span>\n<\/code>/is',
						'/<span style="color: #[A-Z0-9]+"\><\/span>/i'
					),
					array(
						'<span style="color: #$1">',
						"$1</span>\n</span>\n</code>",
						''
					),
					$str);

		// Replace our markers back to PHP tags.
		return str_replace(array('phptagopen', 'phptagclose', 'asptagopen', 'asptagclose', 'backslashtmp', 'scriptclose'),
					array('&lt;?', '?&gt;', '&lt;%', '%&gt;', '\\', '&lt;/script&gt;'),
					$str);
	}
}

// ------------------------------------------------------------------------

/**
 * Phrase Highlighter
 *
 * Highlights a phrase within a text string
 *
 * @access	public
 * @param	string	the text string
 * @param	string	the phrase you'd like to highlight
 * @param	string	the openging tag to precede the phrase with
 * @param	string	the closing tag to end the phrase with
 * @return	string
 */
if ( ! function_exists('highlight_phrase'))
{
	function highlight_phrase($str, $phrase, $tag_open = '<strong>', $tag_close = '</strong>')
	{
		if ($str == '')
		{
			return '';
		}

		if ($phrase != '')
		{
			return preg_replace('/('.preg_quote($phrase, '/').')/i', $tag_open.'\\1'.$tag_close, $str);
		}

		return $str;
	}
}

// ------------------------------------------------------------------------

/**
 * Convert Accented Foreign Characters to ASCII
 *
 * @access	public
 * @param	string	the text string
 * @return	string
 */
if ( ! function_exists('convert_accented_characters'))
{
	function convert_accented_characters($str)
	{
		if (defined('ENVIRONMENT') AND is_file(APPPATH.'config/'.ENVIRONMENT.'/foreign_chars.php'))
		{
			include(APPPATH.'config/'.ENVIRONMENT.'/foreign_chars.php');
		}
		elseif (is_file(APPPATH.'config/foreign_chars.php'))
		{
			include(APPPATH.'config/foreign_chars.php');
		}

		if ( ! isset($foreign_characters))
		{
			return $str;
		}

		return preg_replace(array_keys($foreign_characters), array_values($foreign_characters), $str);
	}
}

// ------------------------------------------------------------------------

/**
 * Word Wrap
 *
 * Wraps text at the specified character.  Maintains the integrity of words.
 * Anything placed between {unwrap}{/unwrap} will not be word wrapped, nor
 * will URLs.
 *
 * @access	public
 * @param	string	the text string
 * @param	integer	the number of characters to wrap at
 * @return	string
 */
if ( ! function_exists('word_wrap'))
{
	function word_wrap($str, $charlim = 76)
	{
		// Set the character limit
		if ( ! is_numeric($charlim))
		{
			$charlim = 76;
		}

		// Reduce multiple spaces
		$str = preg_replace('| +|', ' ', $str);

		// Standardize newlines
		if (strpos($str, "\r") !== FALSE)
		{
			$str = str_replace(array("\r\n", "\r"), "\n", $str);
		}

		// If the current word is surrounded by {unwrap} tags we'll
		// strip the entire chunk and replace it with a marker.
		$unwrap = array();
		if (preg_match_all('|(\{unwrap\}.+?\{/unwrap\})|s', $str, $matches))
		{
			for ($i = 0, $c = count($matches[0]); $i < $c; $i++)
			{
				$unwrap[] = $matches[1][$i];
				$str = str_replace($matches[1][$i], '{{unwrapped'.$i.'}}', $str);
			}
		}

		// Use PHP's native function to do the initial wordwrap.
		// We set the cut flag to FALSE so that any individual words that are
		// too long get left alone. In the next step we'll deal with them.
		$str = wordwrap($str, $charlim, "\n", FALSE);

		// Split the string into individual lines of text and cycle through them
		$output = '';
		foreach (explode("\n", $str) as $line)
		{
			// Is the line within the allowed character count?
			// If so we'll join it to the output and continue
			if (strlen($line) <= $charlim)
			{
				$output .= $line."\n";
				continue;
			}

			$temp = '';
			while ((strlen($line)) > $charlim)
			{
				// If the over-length word is a URL we won't wrap it
				if (preg_match('!\[url.+\]|://|wwww.!', $line))
				{
					break;
				}

				// Trim the word down
				$temp .= substr($line, 0, $charlim-1);
				$line = substr($line, $charlim-1);
			}

			// If $temp contains data it means we had to split up an over-length
			// word into smaller chunks so we'll add it back to our current line
			if ($temp != '')
			{
				$output .= $temp."\n".$line."\n";
			}
			else
			{
				$output .= $line."\n";
			}
		}

		// Put our markers back
		if (count($unwrap) > 0)
		{
			foreach ($unwrap as $key => $val)
			{
				$output = str_replace('{{unwrapped'.$key.'}}', $val, $output);
			}
		}

		// Remove the unwrap tags and return
		return str_replace(array('{unwrap}', '{/unwrap}'), '', $output);
	}
}

// ------------------------------------------------------------------------

/**
 * Ellipsize String
 *
 * This function will strip tags from a string, split it at its max_length and ellipsize
 *
 * @param	string		string to ellipsize
 * @param	integer		max length of string
 * @param	mixed		int (1|0) or float, .5, .2, etc for position to split
 * @param	string		ellipsis ; Default '...'
 * @return	string		ellipsized string
 */
if ( ! function_exists('ellipsize'))
{
	function ellipsize($str, $max_length, $position = 1, $ellipsis = '&hellip;')
	{
		// Strip tags
		$str = trim(strip_tags($str));

		// Is the string long enough to ellipsize?
		if (strlen($str) <= $max_length)
		{
			return $str;
		}

		$beg = substr($str, 0, floor($max_length * $position));
		$position = ($position > 1) ? 1 : $position;

		if ($position === 1)
		{
			$end = substr($str, 0, -($max_length - strlen($beg)));
		}
		else
		{
			$end = substr($str, -($max_length - strlen($beg)));
		}

		return $beg.$ellipsis.$end;
	}
}

/* End of file text_helper.php */
/* Location: ./system/helpers/text_helper.php */