source: branches/testa-single-bookmark/php/spyc-0.5/spyc.php @ 61

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1<?php
2/**
3   * Spyc -- A Simple PHP YAML Class
4   * @version 0.5
5   * @author Vlad Andersen <vlad.andersen@gmail.com>
6   * @author Chris Wanstrath <chris@ozmm.org>
7   * @link http://code.google.com/p/spyc/
8   * @copyright Copyright 2005-2006 Chris Wanstrath, 2006-2011 Vlad Andersen
9   * @license http://www.opensource.org/licenses/mit-license.php MIT License
10   * @package Spyc
11   */
12
13if (!function_exists('spyc_load')) {
14  /**
15   * Parses YAML to array.
16   * @param string $string YAML string.
17   * @return array
18   */
19  function spyc_load ($string) {
20    return Spyc::YAMLLoadString($string);
21  }
22}
23
24if (!function_exists('spyc_load_file')) {
25  /**
26   * Parses YAML to array.
27   * @param string $file Path to YAML file.
28   * @return array
29   */
30  function spyc_load_file ($file) {
31    return Spyc::YAMLLoad($file);
32  }
33}
34
35/**
36   * The Simple PHP YAML Class.
37   *
38   * This class can be used to read a YAML file and convert its contents
39   * into a PHP array.  It currently supports a very limited subsection of
40   * the YAML spec.
41   *
42   * Usage:
43   * <code>
44   *   $Spyc  = new Spyc;
45   *   $array = $Spyc->load($file);
46   * </code>
47   * or:
48   * <code>
49   *   $array = Spyc::YAMLLoad($file);
50   * </code>
51   * or:
52   * <code>
53   *   $array = spyc_load_file($file);
54   * </code>
55   * @package Spyc
56   */
57class Spyc {
58
59  // SETTINGS
60
61  const REMPTY = "\0\0\0\0\0";
62
63  /**
64   * Setting this to true will force YAMLDump to enclose any string value in
65   * quotes.  False by default.
66   *
67   * @var bool
68   */
69  public $setting_dump_force_quotes = false;
70
71  /**
72   * Setting this to true will forse YAMLLoad to use syck_load function when
73   * possible. False by default.
74   * @var bool
75   */
76  public $setting_use_syck_is_possible = false;
77
78
79
80  /**#@+
81  * @access private
82  * @var mixed
83  */
84  private $_dumpIndent;
85  private $_dumpWordWrap;
86  private $_containsGroupAnchor = false;
87  private $_containsGroupAlias = false;
88  private $path;
89  private $result;
90  private $LiteralPlaceHolder = '___YAML_Literal_Block___';
91  private $SavedGroups = array();
92  private $indent;
93  /**
94   * Path modifier that should be applied after adding current element.
95   * @var array
96   */
97  private $delayedPath = array();
98
99  /**#@+
100  * @access public
101  * @var mixed
102  */
103  public $_nodeId;
104
105/**
106 * Load a valid YAML string to Spyc.
107 * @param string $input
108 * @return array
109 */
110  public function load ($input) {
111    return $this->__loadString($input);
112  }
113
114 /**
115 * Load a valid YAML file to Spyc.
116 * @param string $file
117 * @return array
118 */
119  public function loadFile ($file) {
120    return $this->__load($file);
121  }
122
123  /**
124     * Load YAML into a PHP array statically
125     *
126     * The load method, when supplied with a YAML stream (string or file),
127     * will do its best to convert YAML in a file into a PHP array.  Pretty
128     * simple.
129     *  Usage:
130     *  <code>
131     *   $array = Spyc::YAMLLoad('lucky.yaml');
132     *   print_r($array);
133     *  </code>
134     * @access public
135     * @return array
136     * @param string $input Path of YAML file or string containing YAML
137     */
138  public static function YAMLLoad($input) {
139    $Spyc = new Spyc;
140    return $Spyc->__load($input);
141  }
142
143  /**
144     * Load a string of YAML into a PHP array statically
145     *
146     * The load method, when supplied with a YAML string, will do its best
147     * to convert YAML in a string into a PHP array.  Pretty simple.
148     *
149     * Note: use this function if you don't want files from the file system
150     * loaded and processed as YAML.  This is of interest to people concerned
151     * about security whose input is from a string.
152     *
153     *  Usage:
154     *  <code>
155     *   $array = Spyc::YAMLLoadString("---\n0: hello world\n");
156     *   print_r($array);
157     *  </code>
158     * @access public
159     * @return array
160     * @param string $input String containing YAML
161     */
162  public static function YAMLLoadString($input) {
163    $Spyc = new Spyc;
164    return $Spyc->__loadString($input);
165  }
166
167  /**
168     * Dump YAML from PHP array statically
169     *
170     * The dump method, when supplied with an array, will do its best
171     * to convert the array into friendly YAML.  Pretty simple.  Feel free to
172     * save the returned string as nothing.yaml and pass it around.
173     *
174     * Oh, and you can decide how big the indent is and what the wordwrap
175     * for folding is.  Pretty cool -- just pass in 'false' for either if
176     * you want to use the default.
177     *
178     * Indent's default is 2 spaces, wordwrap's default is 40 characters.  And
179     * you can turn off wordwrap by passing in 0.
180     *
181     * @access public
182     * @return string
183     * @param array $array PHP array
184     * @param int $indent Pass in false to use the default, which is 2
185     * @param int $wordwrap Pass in 0 for no wordwrap, false for default (40)
186     */
187  public static function YAMLDump($array,$indent = false,$wordwrap = false) {
188    $spyc = new Spyc;
189    return $spyc->dump($array,$indent,$wordwrap);
190  }
191
192
193  /**
194     * Dump PHP array to YAML
195     *
196     * The dump method, when supplied with an array, will do its best
197     * to convert the array into friendly YAML.  Pretty simple.  Feel free to
198     * save the returned string as tasteful.yaml and pass it around.
199     *
200     * Oh, and you can decide how big the indent is and what the wordwrap
201     * for folding is.  Pretty cool -- just pass in 'false' for either if
202     * you want to use the default.
203     *
204     * Indent's default is 2 spaces, wordwrap's default is 40 characters.  And
205     * you can turn off wordwrap by passing in 0.
206     *
207     * @access public
208     * @return string
209     * @param array $array PHP array
210     * @param int $indent Pass in false to use the default, which is 2
211     * @param int $wordwrap Pass in 0 for no wordwrap, false for default (40)
212     */
213  public function dump($array,$indent = false,$wordwrap = false) {
214    // Dumps to some very clean YAML.  We'll have to add some more features
215    // and options soon.  And better support for folding.
216
217    // New features and options.
218    if ($indent === false or !is_numeric($indent)) {
219      $this->_dumpIndent = 2;
220    } else {
221      $this->_dumpIndent = $indent;
222    }
223
224    if ($wordwrap === false or !is_numeric($wordwrap)) {
225      $this->_dumpWordWrap = 40;
226    } else {
227      $this->_dumpWordWrap = $wordwrap;
228    }
229
230    // New YAML document
231    $string = "---\n";
232
233    // Start at the base of the array and move through it.
234    if ($array) {
235      $array = (array)$array;
236      $previous_key = -1;
237      foreach ($array as $key => $value) {
238        if (!isset($first_key)) $first_key = $key;
239        $string .= $this->_yamlize($key,$value,0,$previous_key, $first_key, $array);
240        $previous_key = $key;
241      }
242    }
243    return $string;
244  }
245
246  /**
247     * Attempts to convert a key / value array item to YAML
248     * @access private
249     * @return string
250     * @param $key The name of the key
251     * @param $value The value of the item
252     * @param $indent The indent of the current node
253     */
254  private function _yamlize($key,$value,$indent, $previous_key = -1, $first_key = 0, $source_array = null) {
255    if (is_array($value)) {
256      if (empty ($value))
257        return $this->_dumpNode($key, array(), $indent, $previous_key, $first_key, $source_array);
258      // It has children.  What to do?
259      // Make it the right kind of item
260      $string = $this->_dumpNode($key, self::REMPTY, $indent, $previous_key, $first_key, $source_array);
261      // Add the indent
262      $indent += $this->_dumpIndent;
263      // Yamlize the array
264      $string .= $this->_yamlizeArray($value,$indent);
265    } elseif (!is_array($value)) {
266      // It doesn't have children.  Yip.
267      $string = $this->_dumpNode($key, $value, $indent, $previous_key, $first_key, $source_array);
268    }
269    return $string;
270  }
271
272  /**
273     * Attempts to convert an array to YAML
274     * @access private
275     * @return string
276     * @param $array The array you want to convert
277     * @param $indent The indent of the current level
278     */
279  private function _yamlizeArray($array,$indent) {
280    if (is_array($array)) {
281      $string = '';
282      $previous_key = -1;
283      foreach ($array as $key => $value) {
284        if (!isset($first_key)) $first_key = $key;
285        $string .= $this->_yamlize($key, $value, $indent, $previous_key, $first_key, $array);
286        $previous_key = $key;
287      }
288      return $string;
289    } else {
290      return false;
291    }
292  }
293
294  /**
295     * Returns YAML from a key and a value
296     * @access private
297     * @return string
298     * @param $key The name of the key
299     * @param $value The value of the item
300     * @param $indent The indent of the current node
301     */
302  private function _dumpNode($key, $value, $indent, $previous_key = -1, $first_key = 0, $source_array = null) {
303    // do some folding here, for blocks
304    if (is_string ($value) && ((strpos($value,"\n") !== false || strpos($value,": ") !== false || strpos($value,"- ") !== false ||
305      strpos($value,"*") !== false || strpos($value,"#") !== false || strpos($value,"<") !== false || strpos($value,">") !== false || strpos ($value, '  ') !== false ||
306      strpos($value,"[") !== false || strpos($value,"]") !== false || strpos($value,"{") !== false || strpos($value,"}") !== false) || strpos($value,"&") !== false || strpos($value, "'") !== false || strpos($value, "!") === 0 ||
307      substr ($value, -1, 1) == ':')
308    ) {
309      $value = $this->_doLiteralBlock($value,$indent);
310    } else {
311      $value  = $this->_doFolding($value,$indent);
312    }
313
314    if ($value === array()) $value = '[ ]';
315    if (in_array ($value, array ('true', 'TRUE', 'false', 'FALSE', 'y', 'Y', 'n', 'N', 'null', 'NULL'), true)) {
316       $value = $this->_doLiteralBlock($value,$indent);
317    }
318    if (trim ($value) != $value)
319       $value = $this->_doLiteralBlock($value,$indent);
320
321    if (is_bool($value)) {
322       $value = ($value) ? "true" : "false";
323    }
324   
325    if ($value === null) $value = 'null';
326    if ($value === "'" . self::REMPTY . "'") $value = null;
327
328    $spaces = str_repeat(' ',$indent);
329
330    //if (is_int($key) && $key - 1 == $previous_key && $first_key===0) {
331    if (is_array ($source_array) && array_keys($source_array) === range(0, count($source_array) - 1)) {
332      // It's a sequence
333      $string = $spaces.'- '.$value."\n";
334    } else {
335      // if ($first_key===0)  throw new Exception('Keys are all screwy.  The first one was zero, now it\'s "'. $key .'"');
336      // It's mapped
337      if (strpos($key, ":") !== false || strpos($key, "#") !== false) { $key = '"' . $key . '"'; }
338      $string = rtrim ($spaces.$key.': '.$value)."\n";
339    }
340    return $string;
341  }
342
343  /**
344     * Creates a literal block for dumping
345     * @access private
346     * @return string
347     * @param $value
348     * @param $indent int The value of the indent
349     */
350  private function _doLiteralBlock($value,$indent) {
351    if ($value === "\n") return '\n';
352    if (strpos($value, "\n") === false && strpos($value, "'") === false) {
353      return sprintf ("'%s'", $value);
354    }
355    if (strpos($value, "\n") === false && strpos($value, '"') === false) {
356      return sprintf ('"%s"', $value);
357    }
358    $exploded = explode("\n",$value);
359    $newValue = '|';
360    $indent  += $this->_dumpIndent;
361    $spaces   = str_repeat(' ',$indent);
362    foreach ($exploded as $line) {
363      $newValue .= "\n" . $spaces . ($line);
364    }
365    return $newValue;
366  }
367
368  /**
369     * Folds a string of text, if necessary
370     * @access private
371     * @return string
372     * @param $value The string you wish to fold
373     */
374  private function _doFolding($value,$indent) {
375    // Don't do anything if wordwrap is set to 0
376
377    if ($this->_dumpWordWrap !== 0 && is_string ($value) && strlen($value) > $this->_dumpWordWrap) {
378      $indent += $this->_dumpIndent;
379      $indent = str_repeat(' ',$indent);
380      $wrapped = wordwrap($value,$this->_dumpWordWrap,"\n$indent");
381      $value   = ">\n".$indent.$wrapped;
382    } else {
383      if ($this->setting_dump_force_quotes && is_string ($value) && $value !== self::REMPTY)
384        $value = '"' . $value . '"';
385    }
386
387
388    return $value;
389  }
390
391// LOADING FUNCTIONS
392
393  private function __load($input) {
394    $Source = $this->loadFromSource($input);
395    return $this->loadWithSource($Source);
396  }
397
398  private function __loadString($input) {
399    $Source = $this->loadFromString($input);
400    return $this->loadWithSource($Source);
401  }
402
403  private function loadWithSource($Source) {
404    if (empty ($Source)) return array();
405    if ($this->setting_use_syck_is_possible && function_exists ('syck_load')) {
406      $array = syck_load (implode ('', $Source));
407      return is_array($array) ? $array : array();
408    }
409
410    $this->path = array();
411    $this->result = array();
412
413    $cnt = count($Source);
414    for ($i = 0; $i < $cnt; $i++) {
415      $line = $Source[$i];
416     
417      $this->indent = strlen($line) - strlen(ltrim($line));
418      $tempPath = $this->getParentPathByIndent($this->indent);
419      $line = self::stripIndent($line, $this->indent);
420      if (self::isComment($line)) continue;
421      if (self::isEmpty($line)) continue;
422      $this->path = $tempPath;
423
424      $literalBlockStyle = self::startsLiteralBlock($line);
425      if ($literalBlockStyle) {
426        $line = rtrim ($line, $literalBlockStyle . " \n");
427        $literalBlock = '';
428        $line .= $this->LiteralPlaceHolder;
429        $literal_block_indent = strlen($Source[$i+1]) - strlen(ltrim($Source[$i+1]));
430        while (++$i < $cnt && $this->literalBlockContinues($Source[$i], $this->indent)) {
431          $literalBlock = $this->addLiteralLine($literalBlock, $Source[$i], $literalBlockStyle, $literal_block_indent);
432        }
433        $i--;
434      }
435
436      while (++$i < $cnt && self::greedilyNeedNextLine($line)) {
437        $line = rtrim ($line, " \n\t\r") . ' ' . ltrim ($Source[$i], " \t");
438      }
439      $i--;
440
441
442
443      if (strpos ($line, '#')) {
444        if (strpos ($line, '"') === false && strpos ($line, "'") === false)
445          $line = preg_replace('/\s+#(.+)$/','',$line);
446      }
447
448      $lineArray = $this->_parseLine($line);
449
450      if ($literalBlockStyle)
451        $lineArray = $this->revertLiteralPlaceHolder ($lineArray, $literalBlock);
452
453      $this->addArray($lineArray, $this->indent);
454
455      foreach ($this->delayedPath as $indent => $delayedPath)
456        $this->path[$indent] = $delayedPath;
457
458      $this->delayedPath = array();
459
460    }
461    return $this->result;
462  }
463
464  private function loadFromSource ($input) {
465    if (!empty($input) && strpos($input, "\n") === false && file_exists($input))
466    return file($input);
467
468    return $this->loadFromString($input);
469  }
470
471  private function loadFromString ($input) {
472    $lines = explode("\n",$input);
473    foreach ($lines as $k => $_) {
474      $lines[$k] = rtrim ($_, "\r");
475    }
476    return $lines;
477  }
478
479  /**
480     * Parses YAML code and returns an array for a node
481     * @access private
482     * @return array
483     * @param string $line A line from the YAML file
484     */
485  private function _parseLine($line) {
486    if (!$line) return array();
487    $line = trim($line);
488    if (!$line) return array();
489
490    $array = array();
491
492    $group = $this->nodeContainsGroup($line);
493    if ($group) {
494      $this->addGroup($line, $group);
495      $line = $this->stripGroup ($line, $group);
496    }
497
498    if ($this->startsMappedSequence($line))
499      return $this->returnMappedSequence($line);
500
501    if ($this->startsMappedValue($line))
502      return $this->returnMappedValue($line);
503
504    if ($this->isArrayElement($line))
505     return $this->returnArrayElement($line);
506
507    if ($this->isPlainArray($line))
508     return $this->returnPlainArray($line);
509     
510     
511    return $this->returnKeyValuePair($line);
512
513  }
514
515  /**
516     * Finds the type of the passed value, returns the value as the new type.
517     * @access private
518     * @param string $value
519     * @return mixed
520     */
521  private function _toType($value) {
522    if ($value === '') return null;
523    $first_character = $value[0];
524    $last_character = substr($value, -1, 1);
525
526    $is_quoted = false;
527    do {
528      if (!$value) break;
529      if ($first_character != '"' && $first_character != "'") break;
530      if ($last_character != '"' && $last_character != "'") break;
531      $is_quoted = true;
532    } while (0);
533
534    if ($is_quoted)
535      return strtr(substr ($value, 1, -1), array ('\\"' => '"', '\'\'' => '\'', '\\\'' => '\''));
536   
537    if (strpos($value, ' #') !== false && !$is_quoted)
538      $value = preg_replace('/\s+#(.+)$/','',$value);
539
540    if (!$is_quoted) $value = str_replace('\n', "\n", $value);
541
542    if ($first_character == '[' && $last_character == ']') {
543      // Take out strings sequences and mappings
544      $innerValue = trim(substr ($value, 1, -1));
545      if ($innerValue === '') return array();
546      $explode = $this->_inlineEscape($innerValue);
547      // Propagate value array
548      $value  = array();
549      foreach ($explode as $v) {
550        $value[] = $this->_toType($v);
551      }
552      return $value;
553    }
554
555    if (strpos($value,': ')!==false && $first_character != '{') {
556      $array = explode(': ',$value);
557      $key   = trim($array[0]);
558      array_shift($array);
559      $value = trim(implode(': ',$array));
560      $value = $this->_toType($value);
561      return array($key => $value);
562    }
563   
564    if ($first_character == '{' && $last_character == '}') {
565      $innerValue = trim(substr ($value, 1, -1));
566      if ($innerValue === '') return array();
567      // Inline Mapping
568      // Take out strings sequences and mappings
569      $explode = $this->_inlineEscape($innerValue);
570      // Propagate value array
571      $array = array();
572      foreach ($explode as $v) {
573        $SubArr = $this->_toType($v);
574        if (empty($SubArr)) continue;
575        if (is_array ($SubArr)) {
576          $array[key($SubArr)] = $SubArr[key($SubArr)]; continue;
577        }
578        $array[] = $SubArr;
579      }
580      return $array;
581    }
582
583    if ($value == 'null' || $value == 'NULL' || $value == 'Null' || $value == '' || $value == '~') {
584      return null;
585    }
586
587    if ( is_numeric($value) && preg_match ('/^(-|)[1-9]+[0-9]*$/', $value) ){
588      $intvalue = (int)$value;
589      if ($intvalue != PHP_INT_MAX)
590        $value = $intvalue;
591      return $value;
592    }
593
594    if (in_array($value,
595                 array('true', 'on', '+', 'yes', 'y', 'True', 'TRUE', 'On', 'ON', 'YES', 'Yes', 'Y'))) {
596      return true;
597    }
598
599    if (in_array(strtolower($value),
600                 array('false', 'off', '-', 'no', 'n'))) {
601      return false;
602    }
603
604    if (is_numeric($value)) {
605      if ($value === '0') return 0;
606      if (rtrim ($value, 0) === $value)
607        $value = (float)$value;
608      return $value;
609    }
610   
611    return $value;
612  }
613
614  /**
615     * Used in inlines to check for more inlines or quoted strings
616     * @access private
617     * @return array
618     */
619  private function _inlineEscape($inline) {
620    // There's gotta be a cleaner way to do this...
621    // While pure sequences seem to be nesting just fine,
622    // pure mappings and mappings with sequences inside can't go very
623    // deep.  This needs to be fixed.
624
625    $seqs = array();
626    $maps = array();
627    $saved_strings = array();
628
629    // Check for strings
630    $regex = '/(?:(")|(?:\'))((?(1)[^"]+|[^\']+))(?(1)"|\')/';
631    if (preg_match_all($regex,$inline,$strings)) {
632      $saved_strings = $strings[0];
633      $inline  = preg_replace($regex,'YAMLString',$inline);
634    }
635    unset($regex);
636
637    $i = 0;
638    do {
639
640    // Check for sequences
641    while (preg_match('/\[([^{}\[\]]+)\]/U',$inline,$matchseqs)) {
642      $seqs[] = $matchseqs[0];
643      $inline = preg_replace('/\[([^{}\[\]]+)\]/U', ('YAMLSeq' . (count($seqs) - 1) . 's'), $inline, 1);
644    }
645
646    // Check for mappings
647    while (preg_match('/{([^\[\]{}]+)}/U',$inline,$matchmaps)) {
648      $maps[] = $matchmaps[0];
649      $inline = preg_replace('/{([^\[\]{}]+)}/U', ('YAMLMap' . (count($maps) - 1) . 's'), $inline, 1);
650    }
651
652    if ($i++ >= 10) break;
653
654    } while (strpos ($inline, '[') !== false || strpos ($inline, '{') !== false);
655
656    $explode = explode(', ',$inline);
657    $stringi = 0; $i = 0;
658
659    while (1) {
660
661    // Re-add the sequences
662    if (!empty($seqs)) {
663      foreach ($explode as $key => $value) {
664        if (strpos($value,'YAMLSeq') !== false) {
665          foreach ($seqs as $seqk => $seq) {
666            $explode[$key] = str_replace(('YAMLSeq'.$seqk.'s'),$seq,$value);
667            $value = $explode[$key];
668          }
669        }
670      }
671    }
672
673    // Re-add the mappings
674    if (!empty($maps)) {
675      foreach ($explode as $key => $value) {
676        if (strpos($value,'YAMLMap') !== false) {
677          foreach ($maps as $mapk => $map) {
678            $explode[$key] = str_replace(('YAMLMap'.$mapk.'s'), $map, $value);
679            $value = $explode[$key];
680          }
681        }
682      }
683    }
684
685
686    // Re-add the strings
687    if (!empty($saved_strings)) {
688      foreach ($explode as $key => $value) {
689        while (strpos($value,'YAMLString') !== false) {
690          $explode[$key] = preg_replace('/YAMLString/',$saved_strings[$stringi],$value, 1);
691          unset($saved_strings[$stringi]);
692          ++$stringi;
693          $value = $explode[$key];
694        }
695      }
696    }
697
698    $finished = true;
699    foreach ($explode as $key => $value) {
700      if (strpos($value,'YAMLSeq') !== false) {
701        $finished = false; break;
702      }
703      if (strpos($value,'YAMLMap') !== false) {
704        $finished = false; break;
705      }
706      if (strpos($value,'YAMLString') !== false) {
707        $finished = false; break;
708      }
709    }
710    if ($finished) break;
711
712    $i++;
713    if ($i > 10)
714      break; // Prevent infinite loops.
715    }
716
717    return $explode;
718  }
719
720  private function literalBlockContinues ($line, $lineIndent) {
721    if (!trim($line)) return true;
722    if (strlen($line) - strlen(ltrim($line)) > $lineIndent) return true;
723    return false;
724  }
725
726  private function referenceContentsByAlias ($alias) {
727    do {
728      if (!isset($this->SavedGroups[$alias])) { echo "Bad group name: $alias."; break; }
729      $groupPath = $this->SavedGroups[$alias];
730      $value = $this->result;
731      foreach ($groupPath as $k) {
732        $value = $value[$k];
733      }
734    } while (false);
735    return $value;
736  }
737
738  private function addArrayInline ($array, $indent) {
739      $CommonGroupPath = $this->path;
740      if (empty ($array)) return false;
741     
742      foreach ($array as $k => $_) {
743        $this->addArray(array($k => $_), $indent);
744        $this->path = $CommonGroupPath;
745      }
746      return true;
747  }
748
749  private function addArray ($incoming_data, $incoming_indent) {
750
751   // print_r ($incoming_data);
752
753    if (count ($incoming_data) > 1)
754      return $this->addArrayInline ($incoming_data, $incoming_indent);
755   
756    $key = key ($incoming_data);
757    $value = isset($incoming_data[$key]) ? $incoming_data[$key] : null;
758    if ($key === '__!YAMLZero') $key = '0';
759
760    if ($incoming_indent == 0 && !$this->_containsGroupAlias && !$this->_containsGroupAnchor) { // Shortcut for root-level values.
761      if ($key || $key === '' || $key === '0') {
762        $this->result[$key] = $value;
763      } else {
764        $this->result[] = $value; end ($this->result); $key = key ($this->result);
765      }
766      $this->path[$incoming_indent] = $key;
767      return;
768    }
769
770
771   
772    $history = array();
773    // Unfolding inner array tree.
774    $history[] = $_arr = $this->result;
775    foreach ($this->path as $k) {
776      $history[] = $_arr = $_arr[$k];
777    }
778
779    if ($this->_containsGroupAlias) {
780      $value = $this->referenceContentsByAlias($this->_containsGroupAlias);
781      $this->_containsGroupAlias = false;
782    }
783
784
785    // Adding string or numeric key to the innermost level or $this->arr.
786    if (is_string($key) && $key == '<<') {
787      if (!is_array ($_arr)) { $_arr = array (); }
788
789      $_arr = array_merge ($_arr, $value);
790    } else if ($key || $key === '' || $key === '0') {
791      if (!is_array ($_arr))
792        $_arr = array ($key=>$value);
793      else
794        $_arr[$key] = $value;
795    } else {
796      if (!is_array ($_arr)) { $_arr = array ($value); $key = 0; }
797      else { $_arr[] = $value; end ($_arr); $key = key ($_arr); }
798    }
799
800    $reverse_path = array_reverse($this->path);
801    $reverse_history = array_reverse ($history);
802    $reverse_history[0] = $_arr;
803    $cnt = count($reverse_history) - 1;
804    for ($i = 0; $i < $cnt; $i++) {
805      $reverse_history[$i+1][$reverse_path[$i]] = $reverse_history[$i];
806    }
807    $this->result = $reverse_history[$cnt];
808
809    $this->path[$incoming_indent] = $key;
810
811    if ($this->_containsGroupAnchor) {
812      $this->SavedGroups[$this->_containsGroupAnchor] = $this->path;
813      if (is_array ($value)) {
814        $k = key ($value);
815        if (!is_int ($k)) {
816          $this->SavedGroups[$this->_containsGroupAnchor][$incoming_indent + 2] = $k;
817        }
818      }
819      $this->_containsGroupAnchor = false;
820    }
821
822  }
823
824  private static function startsLiteralBlock ($line) {
825    $lastChar = substr (trim($line), -1);
826    if ($lastChar != '>' && $lastChar != '|') return false;
827    if ($lastChar == '|') return $lastChar;
828    // HTML tags should not be counted as literal blocks.
829    if (preg_match ('#<.*?>$#', $line)) return false;
830    return $lastChar;
831  }
832
833  private static function greedilyNeedNextLine($line) {
834    $line = trim ($line);
835    if (!strlen($line)) return false;
836    if (substr ($line, -1, 1) == ']') return false;
837    if ($line[0] == '[') return true;
838    if (preg_match ('#^[^:]+?:\s*\[#', $line)) return true;
839    return false;
840  }
841
842  private function addLiteralLine ($literalBlock, $line, $literalBlockStyle, $indent = -1) {
843    $line = self::stripIndent($line, $indent);
844    if ($literalBlockStyle !== '|') {
845        $line = self::stripIndent($line);
846    }
847    $line = rtrim ($line, "\r\n\t ") . "\n";
848    if ($literalBlockStyle == '|') {
849      return $literalBlock . $line;
850    }
851    if (strlen($line) == 0)
852      return rtrim($literalBlock, ' ') . "\n";
853    if ($line == "\n" && $literalBlockStyle == '>') {
854      return rtrim ($literalBlock, " \t") . "\n";
855    }
856    if ($line != "\n")
857      $line = trim ($line, "\r\n ") . " ";
858    return $literalBlock . $line;
859  }
860
861   function revertLiteralPlaceHolder ($lineArray, $literalBlock) {
862     foreach ($lineArray as $k => $_) {
863      if (is_array($_))
864        $lineArray[$k] = $this->revertLiteralPlaceHolder ($_, $literalBlock);
865      else if (substr($_, -1 * strlen ($this->LiteralPlaceHolder)) == $this->LiteralPlaceHolder)
866               $lineArray[$k] = rtrim ($literalBlock, " \r\n");
867     }
868     return $lineArray;
869   }
870
871  private static function stripIndent ($line, $indent = -1) {
872    if ($indent == -1) $indent = strlen($line) - strlen(ltrim($line));
873    return substr ($line, $indent);
874  }
875
876  private function getParentPathByIndent ($indent) {
877    if ($indent == 0) return array();
878    $linePath = $this->path;
879    do {
880      end($linePath); $lastIndentInParentPath = key($linePath);
881      if ($indent <= $lastIndentInParentPath) array_pop ($linePath);
882    } while ($indent <= $lastIndentInParentPath);
883    return $linePath;
884  }
885
886
887  private function clearBiggerPathValues ($indent) {
888
889
890    if ($indent == 0) $this->path = array();
891    if (empty ($this->path)) return true;
892
893    foreach ($this->path as $k => $_) {
894      if ($k > $indent) unset ($this->path[$k]);
895    }
896
897    return true;
898  }
899
900
901  private static function isComment ($line) {
902    if (!$line) return false;
903    if ($line[0] == '#') return true;
904    if (trim($line, " \r\n\t") == '---') return true;
905    return false;
906  }
907
908  private static function isEmpty ($line) {
909    return (trim ($line) === '');
910  }
911
912
913  private function isArrayElement ($line) {
914    if (!$line) return false;
915    if ($line[0] != '-') return false;
916    if (strlen ($line) > 3)
917      if (substr($line,0,3) == '---') return false;
918   
919    return true;
920  }
921
922  private function isHashElement ($line) {
923    return strpos($line, ':');
924  }
925
926  private function isLiteral ($line) {
927    if ($this->isArrayElement($line)) return false;
928    if ($this->isHashElement($line)) return false;
929    return true;
930  }
931
932
933  private static function unquote ($value) {
934    if (!$value) return $value;
935    if (!is_string($value)) return $value;
936    if ($value[0] == '\'') return trim ($value, '\'');
937    if ($value[0] == '"') return trim ($value, '"');
938    return $value;
939  }
940
941  private function startsMappedSequence ($line) {
942    return ($line[0] == '-' && substr ($line, -1, 1) == ':');
943  }
944
945  private function returnMappedSequence ($line) {
946    $array = array();
947    $key         = self::unquote(trim(substr($line,1,-1)));
948    $array[$key] = array();
949    $this->delayedPath = array(strpos ($line, $key) + $this->indent => $key);
950    return array($array);
951  }
952
953  private function returnMappedValue ($line) {
954    $array = array();
955    $key         = self::unquote (trim(substr($line,0,-1)));
956    $array[$key] = '';
957    return $array;
958  }
959
960  private function startsMappedValue ($line) {
961    return (substr ($line, -1, 1) == ':');
962  }
963 
964  private function isPlainArray ($line) {
965    return ($line[0] == '[' && substr ($line, -1, 1) == ']');
966  }
967 
968  private function returnPlainArray ($line) {
969    return $this->_toType($line);
970  } 
971
972  private function returnKeyValuePair ($line) {
973    $array = array();
974    $key = '';
975    if (strpos ($line, ':')) {
976      // It's a key/value pair most likely
977      // If the key is in double quotes pull it out
978      if (($line[0] == '"' || $line[0] == "'") && preg_match('/^(["\'](.*)["\'](\s)*:)/',$line,$matches)) {
979        $value = trim(str_replace($matches[1],'',$line));
980        $key   = $matches[2];
981      } else {
982        // Do some guesswork as to the key and the value
983        $explode = explode(':',$line);
984        $key     = trim($explode[0]);
985        array_shift($explode);
986        $value   = trim(implode(':',$explode));
987      }
988      // Set the type of the value.  Int, string, etc
989      $value = $this->_toType($value);
990      if ($key === '0') $key = '__!YAMLZero';
991      $array[$key] = $value;
992    } else {
993      $array = array ($line);
994    }
995    return $array;
996
997  }
998
999
1000  private function returnArrayElement ($line) {
1001     if (strlen($line) <= 1) return array(array()); // Weird %)
1002     $array = array();
1003     $value   = trim(substr($line,1));
1004     $value   = $this->_toType($value);
1005     $array[] = $value;
1006     return $array;
1007  }
1008
1009
1010  private function nodeContainsGroup ($line) {   
1011    $symbolsForReference = 'A-z0-9_\-';
1012    if (strpos($line, '&') === false && strpos($line, '*') === false) return false; // Please die fast ;-)
1013    if ($line[0] == '&' && preg_match('/^(&['.$symbolsForReference.']+)/', $line, $matches)) return $matches[1];
1014    if ($line[0] == '*' && preg_match('/^(\*['.$symbolsForReference.']+)/', $line, $matches)) return $matches[1];
1015    if (preg_match('/(&['.$symbolsForReference.']+)$/', $line, $matches)) return $matches[1];
1016    if (preg_match('/(\*['.$symbolsForReference.']+$)/', $line, $matches)) return $matches[1];
1017    if (preg_match ('#^\s*<<\s*:\s*(\*[^\s]+).*$#', $line, $matches)) return $matches[1];
1018    return false;
1019
1020  }
1021
1022  private function addGroup ($line, $group) {
1023    if ($group[0] == '&') $this->_containsGroupAnchor = substr ($group, 1);
1024    if ($group[0] == '*') $this->_containsGroupAlias = substr ($group, 1);
1025    //print_r ($this->path);
1026  }
1027
1028  private function stripGroup ($line, $group) {
1029    $line = trim(str_replace($group, '', $line));
1030    return $line;
1031  }
1032}
1033
1034// Enable use of Spyc from command line
1035// The syntax is the following: php spyc.php spyc.yaml
1036
1037define ('SPYC_FROM_COMMAND_LINE', false);
1038
1039do {
1040  if (!SPYC_FROM_COMMAND_LINE) break;
1041  if (empty ($_SERVER['argc']) || $_SERVER['argc'] < 2) break;
1042  if (empty ($_SERVER['PHP_SELF']) || $_SERVER['PHP_SELF'] != 'spyc.php') break;
1043  $file = $argv[1];
1044  printf ("Spyc loading file: %s\n", $file);
1045  print_r (spyc_load_file ($file));
1046} while (0);
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