library/HTMLPurifier/StringHashParser.php

   1 <?php
   2
   3 /**
   4  * Parses string hash files. File format is as such:
   5  *
   6  *      DefaultKeyValue
   7  *      KEY: Value
   8  *      KEY2: Value2
   9  *      --MULTILINE-KEY--
  10  *      Multiline
  11  *      value.
  12  *
  13  * Which would output something similar to:
  14  *
  15  *      array(
  16  *          'ID' => 'DefaultKeyValue',
  17  *          'KEY' => 'Value',
  18  *          'KEY2' => 'Value2',
  19  *          'MULTILINE-KEY' => "Multiline\nvalue.\n",
  20  *      )
  21  *
  22  * We use this as an easy to use file-format for configuration schema
  23  * files, but the class itself is usage agnostic.
  24  *
  25  * You can use ---- to forcibly terminate parsing of a single string-hash;
  26  * this marker is used in multi string-hashes to delimit boundaries.
  27  */
  28 class HTMLPurifier_StringHashParser
  29 {
  30
  31     public $default = 'ID';
  32
  33     /**
  34      * Parses a file that contains a single string-hash.
  35      */
  36     public function parseFile($file) {
  37         if (!file_exists($file)) return false;
  38         $fh = fopen($file, 'r');
  39         if (!$fh) return false;
  40         $ret = $this->parseHandle($fh);
  41         fclose($fh);
  42         return $ret;
  43     }
  44
  45     /**
  46      * Parses a file that contains multiple string-hashes delimited by '----'
  47      */
  48     public function parseMultiFile($file) {
  49         if (!file_exists($file)) return false;
  50         $ret = array();
  51         $fh = fopen($file, 'r');
  52         if (!$fh) return false;
  53         while (!feof($fh)) {
  54             $ret[] = $this->parseHandle($fh);
  55         }
  56         fclose($fh);
  57         return $ret;
  58     }
  59
  60     /**
  61      * Internal parser that acepts a file handle.
  62      * @note While it's possible to simulate in-memory parsing by using
  63      *       custom stream wrappers, if such a use-case arises we should
  64      *       factor out the file handle into its own class.
  65      * @param $fh File handle with pointer at start of valid string-hash
  66      *            block.
  67      */
  68     protected function parseHandle($fh) {
  69         $state   = false;
  70         $single  = false;
  71         $ret     = array();
  72         do {
  73             $line = fgets($fh);
  74             if ($line === false) break;
  75             $line = rtrim($line, "\n\r");
  76             if (!$state && $line === '') continue;
  77             if ($line === '----') break;
  78             if (strncmp('--#', $line, 3) === 0) {
  79                 // Comment
  80                 continue;
  81             } elseif (strncmp('--', $line, 2) === 0) {
  82                 // Multiline declaration
  83                 $state = trim($line, '- ');
  84                 if (!isset($ret[$state])) $ret[$state] = '';
  85                 continue;
  86             } elseif (!$state) {
  87                 $single = true;
  88                 if (strpos($line, ':') !== false) {
  89                     // Single-line declaration
  90                     list($state, $line) = explode(':', $line, 2);
  91                     $line = trim($line);
  92                 } else {
  93                     // Use default declaration
  94                     $state  = $this->default;
  95                 }
  96             }
  97             if ($single) {
  98                 $ret[$state] = $line;
  99                 $single = false;
 100                 $state  = false;
 101             } else {
 102                 $ret[$state] .= "$line\n";
 103             }
 104         } while (!feof($fh));
 105         return $ret;
 106     }
 107
 108 }
 109
 110 // vim: et sw=4 sts=4