video/system/helpers/text_helper.php

   1 <?php  if ( ! defined('BASEPATH')) exit('No direct script access allowed');
   2 /**
   3  * CodeIgniter
   4  *
   5  * An open source application development framework for PHP 5.1.6 or newer
   6  *
   7  * @package             CodeIgniter
   8  * @author              ExpressionEngine Dev Team
   9  * @copyright   Copyright (c) 2008 - 2011, EllisLab, Inc.
  10  * @license             http://codeigniter.com/user_guide/license.html
  11  * @link                http://codeigniter.com
  12  * @since               Version 1.0
  13  * @filesource
  14  */
  15
  16 // ------------------------------------------------------------------------
  17
  18 /**
  19  * CodeIgniter Text Helpers
  20  *
  21  * @package             CodeIgniter
  22  * @subpackage  Helpers
  23  * @category    Helpers
  24  * @author              ExpressionEngine Dev Team
  25  * @link                http://codeigniter.com/user_guide/helpers/text_helper.html
  26  */
  27
  28 // ------------------------------------------------------------------------
  29
  30 /**
  31  * Word Limiter
  32  *
  33  * Limits a string to X number of words.
  34  *
  35  * @access      public
  36  * @param       string
  37  * @param       integer
  38  * @param       string  the end character. Usually an ellipsis
  39  * @return      string
  40  */
  41 if ( ! function_exists('word_limiter'))
  42 {
  43         function word_limiter($str, $limit = 100, $end_char = '&#8230;')
  44         {
  45                 if (trim($str) == '')
  46                 {
  47                         return $str;
  48                 }
  49
  50                 preg_match('/^\s*+(?:\S++\s*+){1,'.(int) $limit.'}/', $str, $matches);
  51
  52                 if (strlen($str) == strlen($matches[0]))
  53                 {
  54                         $end_char = '';
  55                 }
  56
  57                 return rtrim($matches[0]).$end_char;
  58         }
  59 }
  60
  61 // ------------------------------------------------------------------------
  62
  63 /**
  64  * Character Limiter
  65  *
  66  * Limits the string based on the character count.  Preserves complete words
  67  * so the character count may not be exactly as specified.
  68  *
  69  * @access      public
  70  * @param       string
  71  * @param       integer
  72  * @param       string  the end character. Usually an ellipsis
  73  * @return      string
  74  */
  75 if ( ! function_exists('character_limiter'))
  76 {
  77         function character_limiter($str, $n = 500, $end_char = '&#8230;')
  78         {
  79                 if (strlen($str) < $n)
  80                 {
  81                         return $str;
  82                 }
  83
  84                 $str = preg_replace("/\s+/", ' ', str_replace(array("\r\n", "\r", "\n"), ' ', $str));
  85
  86                 if (strlen($str) <= $n)
  87                 {
  88                         return $str;
  89                 }
  90
  91                 $out = "";
  92                 foreach (explode(' ', trim($str)) as $val)
  93                 {
  94                         $out .= $val.' ';
  95
  96                         if (strlen($out) >= $n)
  97                         {
  98                                 $out = trim($out);
  99                                 return (strlen($out) == strlen($str)) ? $out : $out.$end_char;
 100                         }
 101                 }
 102         }
 103 }
 104
 105 // ------------------------------------------------------------------------
 106
 107 /**
 108  * High ASCII to Entities
 109  *
 110  * Converts High ascii text and MS Word special characters to character entities
 111  *
 112  * @access      public
 113  * @param       string
 114  * @return      string
 115  */
 116 if ( ! function_exists('ascii_to_entities'))
 117 {
 118         function ascii_to_entities($str)
 119         {
 120                 $count  = 1;
 121                 $out    = '';
 122                 $temp   = array();
 123
 124                 for ($i = 0, $s = strlen($str); $i < $s; $i++)
 125                 {
 126                         $ordinal = ord($str[$i]);
 127
 128                         if ($ordinal < 128)
 129                         {
 130                                 /*
 131                                         If the $temp array has a value but we have moved on, then it seems only
 132                                         fair that we output that entity and restart $temp before continuing. -Paul
 133                                 */
 134                                 if (count($temp) == 1)
 135                                 {
 136                                         $out  .= '&#'.array_shift($temp).';';
 137                                         $count = 1;
 138                                 }
 139
 140                                 $out .= $str[$i];
 141                         }
 142                         else
 143                         {
 144                                 if (count($temp) == 0)
 145                                 {
 146                                         $count = ($ordinal < 224) ? 2 : 3;
 147                                 }
 148
 149                                 $temp[] = $ordinal;
 150
 151                                 if (count($temp) == $count)
 152                                 {
 153                                         $number = ($count == 3) ? (($temp['0'] % 16) * 4096) + (($temp['1'] % 64) * 64) + ($temp['2'] % 64) : (($temp['0'] % 32) * 64) + ($temp['1'] % 64);
 154
 155                                         $out .= '&#'.$number.';';
 156                                         $count = 1;
 157                                         $temp = array();
 158                                 }
 159                         }
 160                 }
 161
 162                 return $out;
 163         }
 164 }
 165
 166 // ------------------------------------------------------------------------
 167
 168 /**
 169  * Entities to ASCII
 170  *
 171  * Converts character entities back to ASCII
 172  *
 173  * @access      public
 174  * @param       string
 175  * @param       bool
 176  * @return      string
 177  */
 178 if ( ! function_exists('entities_to_ascii'))
 179 {
 180         function entities_to_ascii($str, $all = TRUE)
 181         {
 182                 if (preg_match_all('/\&#(\d+)\;/', $str, $matches))
 183                 {
 184                         for ($i = 0, $s = count($matches['0']); $i < $s; $i++)
 185                         {
 186                                 $digits = $matches['1'][$i];
 187
 188                                 $out = '';
 189
 190                                 if ($digits < 128)
 191                                 {
 192                                         $out .= chr($digits);
 193
 194                                 }
 195                                 elseif ($digits < 2048)
 196                                 {
 197                                         $out .= chr(192 + (($digits - ($digits % 64)) / 64));
 198                                         $out .= chr(128 + ($digits % 64));
 199                                 }
 200                                 else
 201                                 {
 202                                         $out .= chr(224 + (($digits - ($digits % 4096)) / 4096));
 203                                         $out .= chr(128 + ((($digits % 4096) - ($digits % 64)) / 64));
 204                                         $out .= chr(128 + ($digits % 64));
 205                                 }
 206
 207                                 $str = str_replace($matches['0'][$i], $out, $str);
 208                         }
 209                 }
 210
 211                 if ($all)
 212                 {
 213                         $str = str_replace(array("&amp;", "&lt;", "&gt;", "&quot;", "&apos;", "&#45;"),
 214                                                                 array("&","<",">","\"", "'", "-"),
 215                                                                 $str);
 216                 }
 217
 218                 return $str;
 219         }
 220 }
 221
 222 // ------------------------------------------------------------------------
 223
 224 /**
 225  * Word Censoring Function
 226  *
 227  * Supply a string and an array of disallowed words and any
 228  * matched words will be converted to #### or to the replacement
 229  * word you've submitted.
 230  *
 231  * @access      public
 232  * @param       string  the text string
 233  * @param       string  the array of censoered words
 234  * @param       string  the optional replacement value
 235  * @return      string
 236  */
 237 if ( ! function_exists('word_censor'))
 238 {
 239         function word_censor($str, $censored, $replacement = '')
 240         {
 241                 if ( ! is_array($censored))
 242                 {
 243                         return $str;
 244                 }
 245
 246                 $str = ' '.$str.' ';
 247
 248                 // \w, \b and a few others do not match on a unicode character
 249                 // set for performance reasons. As a result words like über
 250                 // will not match on a word boundary. Instead, we'll assume that
 251                 // a bad word will be bookeneded by any of these characters.
 252                 $delim = '[-_\'\"`(){}<>\[\]|!?@#%&,.:;^~*+=\/ 0-9\n\r\t]';
 253
 254                 foreach ($censored as $badword)
 255                 {
 256                         if ($replacement != '')
 257                         {
 258                                 $str = preg_replace("/({$delim})(".str_replace('\*', '\w*?', preg_quote($badword, '/')).")({$delim})/i", "\\1{$replacement}\\3", $str);
 259                         }
 260                         else
 261                         {
 262                                 $str = preg_replace("/({$delim})(".str_replace('\*', '\w*?', preg_quote($badword, '/')).")({$delim})/ie", "'\\1'.str_repeat('#', strlen('\\2')).'\\3'", $str);
 263                         }
 264                 }
 265
 266                 return trim($str);
 267         }
 268 }
 269
 270 // ------------------------------------------------------------------------
 271
 272 /**
 273  * Code Highlighter
 274  *
 275  * Colorizes code strings
 276  *
 277  * @access      public
 278  * @param       string  the text string
 279  * @return      string
 280  */
 281 if ( ! function_exists('highlight_code'))
 282 {
 283         function highlight_code($str)
 284         {
 285                 // The highlight string function encodes and highlights
 286                 // brackets so we need them to start raw
 287                 $str = str_replace(array('&lt;', '&gt;'), array('<', '>'), $str);
 288
 289                 // Replace any existing PHP tags to temporary markers so they don't accidentally
 290                 // break the string out of PHP, and thus, thwart the highlighting.
 291
 292                 $str = str_replace(array('<?', '?>', '<%', '%>', '\\', '</script>'),
 293                                                         array('phptagopen', 'phptagclose', 'asptagopen', 'asptagclose', 'backslashtmp', 'scriptclose'), $str);
 294
 295                 // The highlight_string function requires that the text be surrounded
 296                 // by PHP tags, which we will remove later
 297                 $str = '<?php '.$str.' ?>'; // <?
 298
 299                 // All the magic happens here, baby!
 300                 $str = highlight_string($str, TRUE);
 301
 302                 // Prior to PHP 5, the highligh function used icky <font> tags
 303                 // so we'll replace them with <span> tags.
 304
 305                 if (abs(PHP_VERSION) < 5)
 306                 {
 307                         $str = str_replace(array('<font ', '</font>'), array('<span ', '</span>'), $str);
 308                         $str = preg_replace('#color="(.*?)"#', 'style="color: \\1"', $str);
 309                 }
 310
 311                 // Remove our artificially added PHP, and the syntax highlighting that came with it
 312                 $str = preg_replace('/<span style="color: #([A-Z0-9]+)">&lt;\?php(&nbsp;| )/i', '<span style="color: #$1">', $str);
 313                 $str = preg_replace('/(<span style="color: #[A-Z0-9]+">.*?)\?&gt;<\/span>\n<\/span>\n<\/code>/is', "$1</span>\n</span>\n</code>", $str);
 314                 $str = preg_replace('/<span style="color: #[A-Z0-9]+"\><\/span>/i', '', $str);
 315
 316                 // Replace our markers back to PHP tags.
 317                 $str = str_replace(array('phptagopen', 'phptagclose', 'asptagopen', 'asptagclose', 'backslashtmp', 'scriptclose'),
 318                                                         array('&lt;?', '?&gt;', '&lt;%', '%&gt;', '\\', '&lt;/script&gt;'), $str);
 319
 320                 return $str;
 321         }
 322 }
 323
 324 // ------------------------------------------------------------------------
 325
 326 /**
 327  * Phrase Highlighter
 328  *
 329  * Highlights a phrase within a text string
 330  *
 331  * @access      public
 332  * @param       string  the text string
 333  * @param       string  the phrase you'd like to highlight
 334  * @param       string  the openging tag to precede the phrase with
 335  * @param       string  the closing tag to end the phrase with
 336  * @return      string
 337  */
 338 if ( ! function_exists('highlight_phrase'))
 339 {
 340         function highlight_phrase($str, $phrase, $tag_open = '<strong>', $tag_close = '</strong>')
 341         {
 342                 if ($str == '')
 343                 {
 344                         return '';
 345                 }
 346
 347                 if ($phrase != '')
 348                 {
 349                         return preg_replace('/('.preg_quote($phrase, '/').')/i', $tag_open."\\1".$tag_close, $str);
 350                 }
 351
 352                 return $str;
 353         }
 354 }
 355
 356 // ------------------------------------------------------------------------
 357
 358 /**
 359  * Convert Accented Foreign Characters to ASCII
 360  *
 361  * @access      public
 362  * @param       string  the text string
 363  * @return      string
 364  */
 365 if ( ! function_exists('convert_accented_characters'))
 366 {
 367         function convert_accented_characters($str)
 368         {
 369                 if (defined('ENVIRONMENT') AND is_file(APPPATH.'config/'.ENVIRONMENT.'/foreign_chars.php'))
 370                 {
 371                         include(APPPATH.'config/'.ENVIRONMENT.'/foreign_chars.php');
 372                 }
 373                 elseif (is_file(APPPATH.'config/foreign_chars.php'))
 374                 {
 375                         include(APPPATH.'config/foreign_chars.php');
 376                 }
 377
 378                 if ( ! isset($foreign_characters))
 379                 {
 380                         return $str;
 381                 }
 382
 383                 return preg_replace(array_keys($foreign_characters), array_values($foreign_characters), $str);
 384         }
 385 }
 386
 387 // ------------------------------------------------------------------------
 388
 389 /**
 390  * Word Wrap
 391  *
 392  * Wraps text at the specified character.  Maintains the integrity of words.
 393  * Anything placed between {unwrap}{/unwrap} will not be word wrapped, nor
 394  * will URLs.
 395  *
 396  * @access      public
 397  * @param       string  the text string
 398  * @param       integer the number of characters to wrap at
 399  * @return      string
 400  */
 401 if ( ! function_exists('word_wrap'))
 402 {
 403         function word_wrap($str, $charlim = '76')
 404         {
 405                 // Se the character limit
 406                 if ( ! is_numeric($charlim))
 407                         $charlim = 76;
 408
 409                 // Reduce multiple spaces
 410                 $str = preg_replace("| +|", " ", $str);
 411
 412                 // Standardize newlines
 413                 if (strpos($str, "\r") !== FALSE)
 414                 {
 415                         $str = str_replace(array("\r\n", "\r"), "\n", $str);
 416                 }
 417
 418                 // If the current word is surrounded by {unwrap} tags we'll
 419                 // strip the entire chunk and replace it with a marker.
 420                 $unwrap = array();
 421                 if (preg_match_all("|(\{unwrap\}.+?\{/unwrap\})|s", $str, $matches))
 422                 {
 423                         for ($i = 0; $i < count($matches['0']); $i++)
 424                         {
 425                                 $unwrap[] = $matches['1'][$i];
 426                                 $str = str_replace($matches['1'][$i], "{{unwrapped".$i."}}", $str);
 427                         }
 428                 }
 429
 430                 // Use PHP's native function to do the initial wordwrap.
 431                 // We set the cut flag to FALSE so that any individual words that are
 432                 // too long get left alone.  In the next step we'll deal with them.
 433                 $str = wordwrap($str, $charlim, "\n", FALSE);
 434
 435                 // Split the string into individual lines of text and cycle through them
 436                 $output = "";
 437                 foreach (explode("\n", $str) as $line)
 438                 {
 439                         // Is the line within the allowed character count?
 440                         // If so we'll join it to the output and continue
 441                         if (strlen($line) <= $charlim)
 442                         {
 443                                 $output .= $line."\n";
 444                                 continue;
 445                         }
 446
 447                         $temp = '';
 448                         while ((strlen($line)) > $charlim)
 449                         {
 450                                 // If the over-length word is a URL we won't wrap it
 451                                 if (preg_match("!\[url.+\]|://|wwww.!", $line))
 452                                 {
 453                                         break;
 454                                 }
 455
 456                                 // Trim the word down
 457                                 $temp .= substr($line, 0, $charlim-1);
 458                                 $line = substr($line, $charlim-1);
 459                         }
 460
 461                         // If $temp contains data it means we had to split up an over-length
 462                         // word into smaller chunks so we'll add it back to our current line
 463                         if ($temp != '')
 464                         {
 465                                 $output .= $temp."\n".$line;
 466                         }
 467                         else
 468                         {
 469                                 $output .= $line;
 470                         }
 471
 472                         $output .= "\n";
 473                 }
 474
 475                 // Put our markers back
 476                 if (count($unwrap) > 0)
 477                 {
 478                         foreach ($unwrap as $key => $val)
 479                         {
 480                                 $output = str_replace("{{unwrapped".$key."}}", $val, $output);
 481                         }
 482                 }
 483
 484                 // Remove the unwrap tags
 485                 $output = str_replace(array('{unwrap}', '{/unwrap}'), '', $output);
 486
 487                 return $output;
 488         }
 489 }
 490
 491 // ------------------------------------------------------------------------
 492
 493 /**
 494  * Ellipsize String
 495  *
 496  * This function will strip tags from a string, split it at its max_length and ellipsize
 497  *
 498  * @param       string          string to ellipsize
 499  * @param       integer         max length of string
 500  * @param       mixed           int (1|0) or float, .5, .2, etc for position to split
 501  * @param       string          ellipsis ; Default '...'
 502  * @return      string          ellipsized string
 503  */
 504 if ( ! function_exists('ellipsize'))
 505 {
 506         function ellipsize($str, $max_length, $position = 1, $ellipsis = '&hellip;')
 507         {
 508                 // Strip tags
 509                 $str = trim(strip_tags($str));
 510
 511                 // Is the string long enough to ellipsize?
 512                 if (strlen($str) <= $max_length)
 513                 {
 514                         return $str;
 515                 }
 516
 517                 $beg = substr($str, 0, floor($max_length * $position));
 518
 519                 $position = ($position > 1) ? 1 : $position;
 520
 521                 if ($position === 1)
 522                 {
 523                         $end = substr($str, 0, -($max_length - strlen($beg)));
 524                 }
 525                 else
 526                 {
 527                         $end = substr($str, -($max_length - strlen($beg)));
 528                 }
 529
 530                 return $beg.$ellipsis.$end;
 531         }
 532 }
 533
 534 /* End of file text_helper.php */
 535 /* Location: ./system/helpers/text_helper.php */