includes/api/ApiFormatYaml_spyc.php

   1 <?php
   2 /**
   3  * Spyc -- A Simple PHP YAML Class
   4  * @version 0.2.3 -- 2006-02-04
   5  * @author Chris Wanstrath <chris@ozmm.org>
   6  * @see http://spyc.sourceforge.net/
   7  * @copyright Copyright 2005-2006 Chris Wanstrath
   8  * @license http://www.opensource.org/licenses/mit-license.php MIT License
   9  */
  10
  11 /**
  12  * The Simple PHP YAML Class.
  13  *
  14  * This class can be used to read a YAML file and convert its contents
  15  * into a PHP array.  It currently supports a very limited subsection of
  16  * the YAML spec.
  17  *
  18  * @ingroup API
  19  */
  20 class Spyc {
  21
  22         /**
  23          * Dump YAML from PHP array statically
  24          *
  25          * The dump method, when supplied with an array, will do its best
  26          * to convert the array into friendly YAML.  Pretty simple.  Feel free to
  27          * save the returned string as nothing.yml and pass it around.
  28          *
  29          * Oh, and you can decide how big the indent is and what the wordwrap
  30          * for folding is.  Pretty cool -- just pass in 'false' for either if
  31          * you want to use the default.
  32          *
  33          * Indent's default is 2 spaces, wordwrap's default is 40 characters.  And
  34          * you can turn off wordwrap by passing in 0.
  35          *
  36          * @param $array Array: PHP array
  37          * @param $indent Integer: Pass in false to use the default, which is 2
  38          * @param $wordwrap Integer: Pass in 0 for no wordwrap, false for default (40)
  39          * @return String
  40          */
  41         public static function YAMLDump( $array, $indent = false, $wordwrap = false ) {
  42                 $spyc = new Spyc;
  43                 return $spyc->dump( $array, $indent, $wordwrap );
  44         }
  45
  46         /**
  47          * Dump PHP array to YAML
  48          *
  49          * The dump method, when supplied with an array, will do its best
  50          * to convert the array into friendly YAML.  Pretty simple.  Feel free to
  51          * save the returned string as tasteful.yml and pass it around.
  52          *
  53          * Oh, and you can decide how big the indent is and what the wordwrap
  54          * for folding is.  Pretty cool -- just pass in 'false' for either if
  55          * you want to use the default.
  56          *
  57          * Indent's default is 2 spaces, wordwrap's default is 40 characters.  And
  58          * you can turn off wordwrap by passing in 0.
  59          *
  60          * @param $array Array: PHP array
  61          * @param $indent Integer: Pass in false to use the default, which is 2
  62          * @param $wordwrap Integer: Pass in 0 for no wordwrap, false for default (40)
  63          * @return String
  64          */
  65         public function dump( $array, $indent = false, $wordwrap = false ) {
  66                 // Dumps to some very clean YAML.  We'll have to add some more features
  67                 // and options soon.  And better support for folding.
  68
  69                 // New features and options.
  70                 if ( $indent === false or !is_numeric( $indent ) ) {
  71                         $this->_dumpIndent = 2;
  72                 } else {
  73                         $this->_dumpIndent = $indent;
  74                 }
  75
  76                 if ( $wordwrap === false or !is_numeric( $wordwrap ) ) {
  77                         $this->_dumpWordWrap = 40;
  78                 } else {
  79                         $this->_dumpWordWrap = $wordwrap;
  80                 }
  81
  82                 // New YAML document
  83                 $string = "---\n";
  84
  85                 // Start at the base of the array and move through it.
  86                 foreach ( $array as $key => $value ) {
  87                         $string .= $this->_yamlize( $key, $value, 0 );
  88                 }
  89                 return $string;
  90         }
  91
  92         /**** Private Properties ****/
  93
  94         /**
  95         private $_haveRefs;
  96         private $_allNodes;
  97         private $_lastIndent;
  98         private $_lastNode;
  99         private $_inBlock;
 100         private $_isInline;
 101         **/
 102         private $_dumpIndent;
 103         private $_dumpWordWrap;
 104
 105         /**** Private Methods ****/
 106
 107         /**
 108          * Attempts to convert a key / value array item to YAML
 109          *
 110          * @param $key Mixed: the name of the key
 111          * @param $value Mixed: the value of the item
 112          * @param $indent Integer: the indent of the current node
 113          * @return String
 114          */
 115         private function _yamlize( $key, $value, $indent ) {
 116                 if ( is_array( $value ) ) {
 117                         // It has children.  What to do?
 118                         // Make it the right kind of item
 119                         $string = $this->_dumpNode( $key, null, $indent );
 120                         // Add the indent
 121                         $indent += $this->_dumpIndent;
 122                         // Yamlize the array
 123                         $string .= $this->_yamlizeArray( $value, $indent );
 124                 } elseif ( !is_array( $value ) ) {
 125                         // It doesn't have children.  Yip.
 126                         $string = $this->_dumpNode( $key, $value, $indent );
 127                 }
 128                 return $string;
 129         }
 130
 131         /**
 132          * Attempts to convert an array to YAML
 133          *
 134          * @param $array Array: the array you want to convert
 135          * @param $indent Integer: the indent of the current level
 136          * @return String
 137          */
 138         private function _yamlizeArray( $array, $indent ) {
 139                 if ( is_array( $array ) ) {
 140                         $string = '';
 141                         foreach ( $array as $key => $value ) {
 142                                 $string .= $this->_yamlize( $key, $value, $indent );
 143                         }
 144                         return $string;
 145                 } else {
 146                         return false;
 147                 }
 148     }
 149
 150         /**
 151          * Find out whether a string needs to be output as a literal rather than in plain style.
 152          * Added by Roan Kattouw 13-03-2008
 153          *
 154          * @param $value String: the string to check
 155          * @return Boolean
 156          */
 157         function _needLiteral( $value ) {
 158                 // Check whether the string contains # or : or begins with any of:
 159                 // [ - ? , [ ] { } ! * & | > ' " % @ ` ]
 160                 // or is a number or contains newlines
 161                 return (bool)( gettype( $value ) == "string" &&
 162                         ( is_numeric( $value )  ||
 163                         strpos( $value, "\n" ) ||
 164                         preg_match( "/[#:]/", $value ) ||
 165                         preg_match( "/^[-?,[\]{}!*&|>'\"%@`]/", $value ) ) );
 166         }
 167
 168         /**
 169          * Returns YAML from a key and a value
 170          *
 171          * @param $key Mixed: the name of the key
 172          * @param $value Mixed: the value of the item
 173          * @param $indent Integer: the indent of the current node
 174          * @return String
 175          */
 176         private function _dumpNode( $key, $value, $indent ) {
 177                 // do some folding here, for blocks
 178                 if ( $this->_needLiteral( $value ) ) {
 179                         $value = $this->_doLiteralBlock( $value, $indent );
 180                 } else {
 181                         $value = $this->_doFolding( $value, $indent );
 182                 }
 183
 184                 $spaces = str_repeat( ' ', $indent );
 185
 186                 if ( is_int( $key ) ) {
 187                         // It's a sequence
 188                         if ( $value !== '' && !is_null( $value ) )
 189                                 $string = $spaces . '- ' . $value . "\n";
 190                         else
 191                                 $string = $spaces . "-\n";
 192                 } else {
 193                          if ( $key == '*' ) // bug 21922 - Quote asterix used as keys
 194                                 $key = "'*'";
 195
 196                         // It's mapped
 197                         if ( $value !== '' && !is_null( $value ) )
 198                                 $string = $spaces . $key . ': ' . $value . "\n";
 199                         else
 200                                 $string = $spaces . $key . ":\n";
 201                 }
 202                 return $string;
 203         }
 204
 205         /**
 206          * Creates a literal block for dumping
 207          *
 208          * @param $value String
 209          * @param $indent Integer: the value of the indent
 210          * @return String
 211          */
 212         private function _doLiteralBlock( $value, $indent ) {
 213                 $exploded = explode( "\n", $value );
 214                 $newValue = '|-';
 215                 $indent  += $this->_dumpIndent;
 216                 $spaces   = str_repeat( ' ', $indent );
 217                 foreach ( $exploded as $line ) {
 218                         $newValue .= "\n" . $spaces . trim( $line );
 219                 }
 220                 return $newValue;
 221         }
 222
 223         /**
 224          * Folds a string of text, if necessary
 225          *
 226          * @param $value String: the string you wish to fold
 227          * @param $indent Integer: the indent of the current node
 228          * @return String
 229          */
 230         private function _doFolding( $value, $indent ) {
 231                 // Don't do anything if wordwrap is set to 0
 232                 if ( $this->_dumpWordWrap === 0 ) {
 233                         return $value;
 234                 }
 235
 236                 if ( strlen( $value ) > $this->_dumpWordWrap ) {
 237                         $indent += $this->_dumpIndent;
 238                         $indent = str_repeat( ' ', $indent );
 239                         $wrapped = wordwrap( $value, $this->_dumpWordWrap, "\n$indent" );
 240                         $value   = ">-\n" . $indent . $wrapped;
 241                 }
 242                 return $value;
 243         }
 244 }