wp-includes/pomo/po.php

   1 <?php
   2 /**
   3  * Class for working with PO files
   4  *
   5  * @version $Id: po.php 589 2010-12-18 01:40:57Z nbachiyski $
   6  * @package pomo
   7  * @subpackage po
   8  */
   9
  10 require_once dirname(__FILE__) . '/translations.php';
  11
  12 define('PO_MAX_LINE_LEN', 79);
  13
  14 ini_set('auto_detect_line_endings', 1);
  15
  16 /**
  17  * Routines for working with PO files
  18  */
  19 if ( !class_exists( 'PO' ) ):
  20 class PO extends Gettext_Translations {
  21
  22         var $comments_before_headers = '';
  23
  24         /**
  25          * Exports headers to a PO entry
  26          *
  27          * @return string msgid/msgstr PO entry for this PO file headers, doesn't contain newline at the end
  28          */
  29         function export_headers() {
  30                 $header_string = '';
  31                 foreach($this->headers as $header => $value) {
  32                         $header_string.= "$header: $value\n";
  33                 }
  34                 $poified = PO::poify($header_string);
  35                 if ($this->comments_before_headers)
  36                         $before_headers = $this->prepend_each_line(rtrim($this->comments_before_headers)."\n", '# ');
  37                 else
  38                         $before_headers = '';
  39                 return rtrim("{$before_headers}msgid \"\"\nmsgstr $poified");
  40         }
  41
  42         /**
  43          * Exports all entries to PO format
  44          *
  45          * @return string sequence of mgsgid/msgstr PO strings, doesn't containt newline at the end
  46          */
  47         function export_entries() {
  48                 //TODO sorting
  49                 return implode("\n\n", array_map(array('PO', 'export_entry'), $this->entries));
  50         }
  51
  52         /**
  53          * Exports the whole PO file as a string
  54          *
  55          * @param bool $include_headers whether to include the headers in the export
  56          * @return string ready for inclusion in PO file string for headers and all the enrtries
  57          */
  58         function export($include_headers = true) {
  59                 $res = '';
  60                 if ($include_headers) {
  61                         $res .= $this->export_headers();
  62                         $res .= "\n\n";
  63                 }
  64                 $res .= $this->export_entries();
  65                 return $res;
  66         }
  67
  68         /**
  69          * Same as {@link export}, but writes the result to a file
  70          *
  71          * @param string $filename where to write the PO string
  72          * @param bool $include_headers whether to include tje headers in the export
  73          * @return bool true on success, false on error
  74          */
  75         function export_to_file($filename, $include_headers = true) {
  76                 $fh = fopen($filename, 'w');
  77                 if (false === $fh) return false;
  78                 $export = $this->export($include_headers);
  79                 $res = fwrite($fh, $export);
  80                 if (false === $res) return false;
  81                 return fclose($fh);
  82         }
  83
  84         /**
  85          * Text to include as a comment before the start of the PO contents
  86          *
  87          * Doesn't need to include # in the beginning of lines, these are added automatically
  88          */
  89         function set_comment_before_headers( $text ) {
  90                 $this->comments_before_headers = $text;
  91         }
  92
  93         /**
  94          * Formats a string in PO-style
  95          *
  96          * @static
  97          * @param string $string the string to format
  98          * @return string the poified string
  99          */
 100         function poify($string) {
 101                 $quote = '"';
 102                 $slash = '\\';
 103                 $newline = "\n";
 104
 105                 $replaces = array(
 106                         "$slash"        => "$slash$slash",
 107                         "$quote"        => "$slash$quote",
 108                         "\t"            => '\t',
 109                 );
 110
 111                 $string = str_replace(array_keys($replaces), array_values($replaces), $string);
 112
 113                 $po = $quote.implode("${slash}n$quote$newline$quote", explode($newline, $string)).$quote;
 114                 // add empty string on first line for readbility
 115                 if (false !== strpos($string, $newline) &&
 116                                 (substr_count($string, $newline) > 1 || !($newline === substr($string, -strlen($newline))))) {
 117                         $po = "$quote$quote$newline$po";
 118                 }
 119                 // remove empty strings
 120                 $po = str_replace("$newline$quote$quote", '', $po);
 121                 return $po;
 122         }
 123
 124         /**
 125          * Gives back the original string from a PO-formatted string
 126          *
 127          * @static
 128          * @param string $string PO-formatted string
 129          * @return string enascaped string
 130          */
 131         function unpoify($string) {
 132                 $escapes = array('t' => "\t", 'n' => "\n", '\\' => '\\');
 133                 $lines = array_map('trim', explode("\n", $string));
 134                 $lines = array_map(array('PO', 'trim_quotes'), $lines);
 135                 $unpoified = '';
 136                 $previous_is_backslash = false;
 137                 foreach($lines as $line) {
 138                         preg_match_all('/./u', $line, $chars);
 139                         $chars = $chars[0];
 140                         foreach($chars as $char) {
 141                                 if (!$previous_is_backslash) {
 142                                         if ('\\' == $char)
 143                                                 $previous_is_backslash = true;
 144                                         else
 145                                                 $unpoified .= $char;
 146                                 } else {
 147                                         $previous_is_backslash = false;
 148                                         $unpoified .= isset($escapes[$char])? $escapes[$char] : $char;
 149                                 }
 150                         }
 151                 }
 152                 return $unpoified;
 153         }
 154
 155         /**
 156          * Inserts $with in the beginning of every new line of $string and
 157          * returns the modified string
 158          *
 159          * @static
 160          * @param string $string prepend lines in this string
 161          * @param string $with prepend lines with this string
 162          */
 163         function prepend_each_line($string, $with) {
 164                 $php_with = var_export($with, true);
 165                 $lines = explode("\n", $string);
 166                 // do not prepend the string on the last empty line, artefact by explode
 167                 if ("\n" == substr($string, -1)) unset($lines[count($lines) - 1]);
 168                 $res = implode("\n", array_map(create_function('$x', "return $php_with.\$x;"), $lines));
 169                 // give back the empty line, we ignored above
 170                 if ("\n" == substr($string, -1)) $res .= "\n";
 171                 return $res;
 172         }
 173
 174         /**
 175          * Prepare a text as a comment -- wraps the lines and prepends #
 176          * and a special character to each line
 177          *
 178          * @access private
 179          * @param string $text the comment text
 180          * @param string $char character to denote a special PO comment,
 181          *      like :, default is a space
 182          */
 183         function comment_block($text, $char=' ') {
 184                 $text = wordwrap($text, PO_MAX_LINE_LEN - 3);
 185                 return PO::prepend_each_line($text, "#$char ");
 186         }
 187
 188         /**
 189          * Builds a string from the entry for inclusion in PO file
 190          *
 191          * @static
 192          * @param object &$entry the entry to convert to po string
 193          * @return string|bool PO-style formatted string for the entry or
 194          *      false if the entry is empty
 195          */
 196         function export_entry(&$entry) {
 197                 if (is_null($entry->singular)) return false;
 198                 $po = array();
 199                 if (!empty($entry->translator_comments)) $po[] = PO::comment_block($entry->translator_comments);
 200                 if (!empty($entry->extracted_comments)) $po[] = PO::comment_block($entry->extracted_comments, '.');
 201                 if (!empty($entry->references)) $po[] = PO::comment_block(implode(' ', $entry->references), ':');
 202                 if (!empty($entry->flags)) $po[] = PO::comment_block(implode(", ", $entry->flags), ',');
 203                 if (!is_null($entry->context)) $po[] = 'msgctxt '.PO::poify($entry->context);
 204                 $po[] = 'msgid '.PO::poify($entry->singular);
 205                 if (!$entry->is_plural) {
 206                         $translation = empty($entry->translations)? '' : $entry->translations[0];
 207                         $po[] = 'msgstr '.PO::poify($translation);
 208                 } else {
 209                         $po[] = 'msgid_plural '.PO::poify($entry->plural);
 210                         $translations = empty($entry->translations)? array('', '') : $entry->translations;
 211                         foreach($translations as $i => $translation) {
 212                                 $po[] = "msgstr[$i] ".PO::poify($translation);
 213                         }
 214                 }
 215                 return implode("\n", $po);
 216         }
 217
 218         function import_from_file($filename) {
 219                 $f = fopen($filename, 'r');
 220                 if (!$f) return false;
 221                 $lineno = 0;
 222                 while (true) {
 223                         $res = $this->read_entry($f, $lineno);
 224                         if (!$res) break;
 225                         if ($res['entry']->singular == '') {
 226                                 $this->set_headers($this->make_headers($res['entry']->translations[0]));
 227                         } else {
 228                                 $this->add_entry($res['entry']);
 229                         }
 230                 }
 231                 PO::read_line($f, 'clear');
 232                 return $res !== false;
 233         }
 234
 235         function read_entry($f, $lineno = 0) {
 236                 $entry = new Translation_Entry();
 237                 // where were we in the last step
 238                 // can be: comment, msgctxt, msgid, msgid_plural, msgstr, msgstr_plural
 239                 $context = '';
 240                 $msgstr_index = 0;
 241                 $is_final = create_function('$context', 'return $context == "msgstr" || $context == "msgstr_plural";');
 242                 while (true) {
 243                         $lineno++;
 244                         $line = PO::read_line($f);
 245                         if (!$line)  {
 246                                 if (feof($f)) {
 247                                         if ($is_final($context))
 248                                                 break;
 249                                         elseif (!$context) // we haven't read a line and eof came
 250                                                 return null;
 251                                         else
 252                                                 return false;
 253                                 } else {
 254                                         return false;
 255                                 }
 256                         }
 257                         if ($line == "\n") continue;
 258                         $line = trim($line);
 259                         if (preg_match('/^#/', $line, $m)) {
 260                                 // the comment is the start of a new entry
 261                                 if ($is_final($context)) {
 262                                         PO::read_line($f, 'put-back');
 263                                         $lineno--;
 264                                         break;
 265                                 }
 266                                 // comments have to be at the beginning
 267                                 if ($context && $context != 'comment') {
 268                                         return false;
 269                                 }
 270                                 // add comment
 271                                 $this->add_comment_to_entry($entry, $line);;
 272                         } elseif (preg_match('/^msgctxt\s+(".*")/', $line, $m)) {
 273                                 if ($is_final($context)) {
 274                                         PO::read_line($f, 'put-back');
 275                                         $lineno--;
 276                                         break;
 277                                 }
 278                                 if ($context && $context != 'comment') {
 279                                         return false;
 280                                 }
 281                                 $context = 'msgctxt';
 282                                 $entry->context .= PO::unpoify($m[1]);
 283                         } elseif (preg_match('/^msgid\s+(".*")/', $line, $m)) {
 284                                 if ($is_final($context)) {
 285                                         PO::read_line($f, 'put-back');
 286                                         $lineno--;
 287                                         break;
 288                                 }
 289                                 if ($context && $context != 'msgctxt' && $context != 'comment') {
 290                                         return false;
 291                                 }
 292                                 $context = 'msgid';
 293                                 $entry->singular .= PO::unpoify($m[1]);
 294                         } elseif (preg_match('/^msgid_plural\s+(".*")/', $line, $m)) {
 295                                 if ($context != 'msgid') {
 296                                         return false;
 297                                 }
 298                                 $context = 'msgid_plural';
 299                                 $entry->is_plural = true;
 300                                 $entry->plural .= PO::unpoify($m[1]);
 301                         } elseif (preg_match('/^msgstr\s+(".*")/', $line, $m)) {
 302                                 if ($context != 'msgid') {
 303                                         return false;
 304                                 }
 305                                 $context = 'msgstr';
 306                                 $entry->translations = array(PO::unpoify($m[1]));
 307                         } elseif (preg_match('/^msgstr\[(\d+)\]\s+(".*")/', $line, $m)) {
 308                                 if ($context != 'msgid_plural' && $context != 'msgstr_plural') {
 309                                         return false;
 310                                 }
 311                                 $context = 'msgstr_plural';
 312                                 $msgstr_index = $m[1];
 313                                 $entry->translations[$m[1]] = PO::unpoify($m[2]);
 314                         } elseif (preg_match('/^".*"$/', $line)) {
 315                                 $unpoified = PO::unpoify($line);
 316                                 switch ($context) {
 317                                         case 'msgid':
 318                                                 $entry->singular .= $unpoified; break;
 319                                         case 'msgctxt':
 320                                                 $entry->context .= $unpoified; break;
 321                                         case 'msgid_plural':
 322                                                 $entry->plural .= $unpoified; break;
 323                                         case 'msgstr':
 324                                                 $entry->translations[0] .= $unpoified; break;
 325                                         case 'msgstr_plural':
 326                                                 $entry->translations[$msgstr_index] .= $unpoified; break;
 327                                         default:
 328                                                 return false;
 329                                 }
 330                         } else {
 331                                 return false;
 332                         }
 333                 }
 334                 if (array() == array_filter($entry->translations, create_function('$t', 'return $t || "0" === $t;'))) {
 335                         $entry->translations = array();
 336                 }
 337                 return array('entry' => $entry, 'lineno' => $lineno);
 338         }
 339
 340         function read_line($f, $action = 'read') {
 341                 static $last_line = '';
 342                 static $use_last_line = false;
 343                 if ('clear' == $action) {
 344                         $last_line = '';
 345                         return true;
 346                 }
 347                 if ('put-back' == $action) {
 348                         $use_last_line = true;
 349                         return true;
 350                 }
 351                 $line = $use_last_line? $last_line : fgets($f);
 352                 $last_line = $line;
 353                 $use_last_line = false;
 354                 return $line;
 355         }
 356
 357         function add_comment_to_entry(&$entry, $po_comment_line) {
 358                 $first_two = substr($po_comment_line, 0, 2);
 359                 $comment = trim(substr($po_comment_line, 2));
 360                 if ('#:' == $first_two) {
 361                         $entry->references = array_merge($entry->references, preg_split('/\s+/', $comment));
 362                 } elseif ('#.' == $first_two) {
 363                         $entry->extracted_comments = trim($entry->extracted_comments . "\n" . $comment);
 364                 } elseif ('#,' == $first_two) {
 365                         $entry->flags = array_merge($entry->flags, preg_split('/,\s*/', $comment));
 366                 } else {
 367                         $entry->translator_comments = trim($entry->translator_comments . "\n" . $comment);
 368                 }
 369         }
 370
 371         function trim_quotes($s) {
 372                 if ( substr($s, 0, 1) == '"') $s = substr($s, 1);
 373                 if ( substr($s, -1, 1) == '"') $s = substr($s, 0, -1);
 374                 return $s;
 375         }
 376 }
 377 endif;