Mercurial > judyates

     1 <?php

     2 /**

     3     This program is free software; you can redistribute it and/or modify

     4     it under the terms of the GNU General Public License as published by

     5     the Free Software Foundation; either version 2 of the License, or

     6     (at your option) any later version.

     7 

     8     This program is distributed in the hope that it will be useful,

     9     but WITHOUT ANY WARRANTY; without even the implied warranty of

    10     MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the

    11     GNU General Public License for more details.

    12 

    13     For support, please visit http://www.criticaldevelopment.net/xml/

    14 */

    15 

    16 /**

    17  * XML Parser Class (php5)

    18  * 

    19  * Parses an XML document into an object structure much like the SimpleXML extension.

    20  *

    21  * @author Adam A. Flynn <adamaflynn@criticaldevelopment.net>

    22  * @copyright Copyright (c) 2005-2007, Adam A. Flynn

    23  *

    24  * @version 1.3.0

    25  */

    26 class XMLParser 

    27 {

    28     /**

    29      * The XML parser

    30      *

    31      * @var resource

    32      */

    33     private $parser;

    34 

    35     /**

    36     * The XML document

    37     *

    38     * @var string

    39     */

    40     private $xml;

    41 

    42     /**

    43     * Document tag

    44     *

    45     * @var object

    46     */

    47     public $document;

    48 

    49     /**

    50     * Current object depth

    51     *

    52     * @var array

    53     */

    54     private $stack;

    55     

    56     /**

    57      * Whether or not to replace dashes and colons in tag

    58      * names with underscores.

    59      * 

    60      * @var bool

    61      */

    62     private $cleanTagNames;

    63 

    64     

    65     /**

    66      * Constructor. Loads XML document.

    67      *

    68      * @param string $xml The string of the XML document

    69      * @return XMLParser

    70      */

    71     function __construct($xml = '', $cleanTagNames = true)

    72     {

    73         //Load XML document

    74         $this->xml = $xml;

    75 

    76         //Set stack to an array

    77         $this->stack = array();

    78         

    79         //Set whether or not to clean tag names

    80         $this->cleanTagNames = $cleanTagNames;

    81     }

    82 

    83     /**

    84      * Initiates and runs PHP's XML parser

    85      */

    86     public function Parse()

    87     {

    88         //Create the parser resource

    89         $this->parser = xml_parser_create();

    90         

    91         //Set the handlers

    92         xml_set_object($this->parser, $this);

    93         xml_set_element_handler($this->parser, 'StartElement', 'EndElement');

    94         xml_set_character_data_handler($this->parser, 'CharacterData');

    95 

    96         //Error handling

    97         if (!xml_parse($this->parser, $this->xml))

    98             $this->HandleError(xml_get_error_code($this->parser), xml_get_current_line_number($this->parser), xml_get_current_column_number($this->parser));

    99 

   100         //Free the parser

   101         xml_parser_free($this->parser);

   102     }

   103     

   104     /**

   105      * Handles an XML parsing error

   106      *

   107      * @param int $code XML Error Code

   108      * @param int $line Line on which the error happened

   109      * @param int $col Column on which the error happened

   110      */

   111     private function HandleError($code, $line, $col)

   112     {

   113         trigger_error('XML Parsing Error at '.$line.':'.$col.'. Error '.$code.': '.xml_error_string($code));

   114     }

   115 

   116     

   117     /**

   118      * Gets the XML output of the PHP structure within $this->document

   119      *

   120      * @return string

   121      */

   122     public function GenerateXML()

   123     {

   124         return $this->document->GetXML();

   125     }

   126 

   127     /**

   128      * Gets the reference to the current direct parent

   129      *

   130      * @return object

   131      */

   132     private function GetStackLocation()

   133     {

   134         //Returns the reference to the current direct parent

   135         return end($this->stack);

   136     }

   137 

   138     /**

   139      * Handler function for the start of a tag

   140      *

   141      * @param resource $parser

   142      * @param string $name

   143      * @param array $attrs

   144      */

   145     private function StartElement($parser, $name, $attrs = array())

   146     {

   147         //Make the name of the tag lower case

   148         $name = strtolower($name);

   149         

   150         //Check to see if tag is root-level

   151         if (count($this->stack) == 0) 

   152         {

   153             //If so, set the document as the current tag

   154             $this->document = new XMLTag($name, $attrs);

   155 

   156             //And start out the stack with the document tag

   157             $this->stack = array(&$this->document);

   158         }

   159         //If it isn't root level, use the stack to find the parent

   160         else

   161         {

   162             //Get the reference to the current direct parent

   163             $parent = $this->GetStackLocation();

   164             

   165             $parent->AddChild($name, $attrs, count($this->stack), $this->cleanTagNames);

   166 

   167             //If the cleanTagName feature is on, clean the tag names

   168             if($this->cleanTagNames)

   169                 $name = str_replace(array(':', '-'), '_', $name);

   170 

   171             //Update the stack

   172             $this->stack[] = end($parent->$name);        

   173         }

   174     }

   175 

   176     /**

   177      * Handler function for the end of a tag

   178      *

   179      * @param resource $parser

   180      * @param string $name

   181      */

   182     private function EndElement($parser, $name)

   183     {

   184         //Update stack by removing the end value from it as the parent

   185         array_pop($this->stack);

   186     }

   187 

   188     /**

   189      * Handler function for the character data within a tag

   190      *

   191      * @param resource $parser

   192      * @param string $data

   193      */

   194     private function CharacterData($parser, $data)

   195     {

   196         //Get the reference to the current parent object

   197         $tag = $this->GetStackLocation();

   198 

   199         //Assign data to it

   200         $tag->tagData .= trim($data);

   201     }

   202 }

   203 

   204 

   205 /**

   206  * XML Tag Object (php5)

   207  * 

   208  * This object stores all of the direct children of itself in the $children array. They are also stored by

   209  * type as arrays. So, if, for example, this tag had 2 <font> tags as children, there would be a class member

   210  * called $font created as an array. $font[0] would be the first font tag, and $font[1] would be the second.

   211  * 

   212  * To loop through all of the direct children of this object, the $children member should be used.

   213  *

   214  * To loop through all of the direct children of a specific tag for this object, it is probably easier 

   215  * to use the arrays of the specific tag names, as explained above.

   216  * 

   217  * @author Adam A. Flynn <adamaflynn@criticaldevelopment.net>

   218  * @copyright Copyright (c) 2005-2007, Adam A. Flynn

   219  *

   220  * @version 1.3.0

   221  */

   222 class XMLTag

   223 {

   224     /**

   225      * Array with the attributes of this XML tag

   226      *

   227      * @var array

   228      */

   229     public $tagAttrs;

   230     

   231     /**

   232      * The name of the tag

   233      *

   234      * @var string

   235      */

   236     public $tagName;

   237     

   238     /**

   239      * The data the tag contains 

   240      * 

   241      * So, if the tag doesn't contain child tags, and just contains a string, it would go here

   242      *

   243      * @var stat

   244      */

   245     public $tagData;

   246     

   247     /**

   248      * Array of references to the objects of all direct children of this XML object

   249      *

   250      * @var array

   251      */

   252     public $tagChildren;

   253     

   254     /**

   255      * The number of parents this XML object has (number of levels from this tag to the root tag)

   256      *

   257      * Used presently only to set the number of tabs when outputting XML

   258      *

   259      * @var int

   260      */

   261     public $tagParents;

   262     

   263     /**

   264      * Constructor, sets up all the default values

   265      *

   266      * @param string $name

   267      * @param array $attrs

   268      * @param int $parents

   269      * @return XMLTag

   270      */

   271     function __construct($name, $attrs = array(), $parents = 0)

   272     {

   273         //Make the keys of the attr array lower case, and store the value

   274         $this->tagAttrs = array_change_key_case($attrs, CASE_LOWER);

   275         

   276         //Make the name lower case and store the value

   277         $this->tagName = strtolower($name);

   278         

   279         //Set the number of parents

   280         $this->tagParents = $parents;

   281         

   282         //Set the types for children and data

   283         $this->tagChildren = array();

   284         $this->tagData = '';

   285     }

   286     

   287     /**

   288      * Adds a direct child to this object

   289      *

   290      * @param string $name

   291      * @param array $attrs

   292      * @param int $parents

   293      * @param bool $cleanTagName

   294      */

   295     public function AddChild($name, $attrs, $parents, $cleanTagName = true)

   296     {    

   297         //If the tag is a reserved name, output an error

   298         if(in_array($name, array('tagChildren', 'tagAttrs', 'tagParents', 'tagData', 'tagName')))

   299         {

   300             trigger_error('You have used a reserved name as the name of an XML tag. Please consult the documentation (http://www.criticaldevelopment.net/xml/) and rename the tag named "'.$name.'" to something other than a reserved name.', E_USER_ERROR);

   301 

   302             return;

   303         }

   304 

   305         //Create the child object itself

   306         $child = new XMLTag($name, $attrs, $parents);

   307 

   308         //If the cleanTagName feature is on, replace colons and dashes with underscores

   309         if($cleanTagName)

   310             $name = str_replace(array(':', '-'), '_', $name);

   311         

   312         //Toss up a notice if someone's trying to to use a colon or dash in a tag name

   313         elseif(strstr($name, ':') || strstr($name, '-'))

   314             trigger_error('Your tag named "'.$name.'" contains either a dash or a colon. Neither of these characters are friendly with PHP variable names, and, as such, you may have difficulty accessing them. You might want to think about enabling the cleanTagName feature (pass true as the second argument of the XMLParser constructor). For more details, see http://www.criticaldevelopment.net/xml/', E_USER_NOTICE);

   315         

   316         //If there is no array already set for the tag name being added, 

   317         //create an empty array for it

   318         if(!isset($this->$name))

   319             $this->$name = array();

   320         

   321         //Add the reference of it to the end of an array member named for the tag's name

   322         $this->{$name}[] = &$child;

   323         

   324         //Add the reference to the children array member

   325         $this->tagChildren[] = &$child;

   326         

   327         //Return a reference to this object for the stack

   328         return $this;

   329     }

   330     

   331     /**

   332      * Returns the string of the XML document which would be generated from this object

   333      * 

   334      * This function works recursively, so it gets the XML of itself and all of its children, which

   335      * in turn gets the XML of all their children, which in turn gets the XML of all thier children,

   336      * and so on. So, if you call GetXML from the document root object, it will return a string for 

   337      * the XML of the entire document.

   338      * 

   339      * This function does not, however, return a DTD or an XML version/encoding tag. That should be

   340      * handled by XMLParser::GetXML()

   341      *

   342      * @return string

   343      */

   344     public function GetXML()

   345     {

   346         //Start a new line, indent by the number indicated in $this->parents, add a <, and add the name of the tag

   347         $out = "\n".str_repeat("\t", $this->tagParents).'<'.$this->tagName;

   348 

   349         //For each attribute, add attr="value"

   350         foreach($this->tagAttrs as $attr => $value)

   351             $out .= ' '.$attr.'="'.$value.'"';

   352         

   353         //If there are no children and it contains no data, end it off with a />

   354         if(empty($this->tagChildren) && empty($this->tagData))

   355             $out .= " />";

   356         

   357         //Otherwise...

   358         else

   359         {    

   360             //If there are children

   361             if(!empty($this->tagChildren))

   362             {

   363                 //Close off the start tag

   364                 $out .= '>';

   365                 

   366                 //For each child, call the GetXML function (this will ensure that all children are added recursively)

   367                 foreach($this->tagChildren as $child)

   368                     $out .= $child->GetXML();

   369 

   370                 //Add the newline and indentation to go along with the close tag

   371                 $out .= "\n".str_repeat("\t", $this->tagParents);

   372             }

   373             

   374             //If there is data, close off the start tag and add the data

   375             elseif(!empty($this->tagData))

   376                 $out .= '>'.$this->tagData;

   377             

   378             //Add the end tag    

   379             $out .= '</'.$this->tagName.'>';

   380         }

   381         

   382         //Return the final output

   383         return $out;

   384     }

   385     

   386     /**

   387      * Deletes this tag's child with a name of $childName and an index

   388      * of $childIndex

   389      *

   390      * @param string $childName

   391      * @param int $childIndex

   392      */

   393     public function Delete($childName, $childIndex = 0)

   394     {

   395         //Delete all of the children of that child

   396         $this->{$childName}[$childIndex]->DeleteChildren();

   397         

   398         //Destroy the child's value

   399         $this->{$childName}[$childIndex] = null;

   400         

   401         //Remove the child's name from the named array

   402         unset($this->{$childName}[$childIndex]);

   403         

   404         //Loop through the tagChildren array and remove any null

   405         //values left behind from the above operation

   406         for($x = 0; $x < count($this->tagChildren); $x ++)

   407         {

   408             if(is_null($this->tagChildren[$x]))

   409                 unset($this->tagChildren[$x]);

   410         }

   411     }

   412     

   413     /**

   414      * Removes all of the children of this tag in both name and value

   415      */

   416     private function DeleteChildren()

   417     {

   418         //Loop through all child tags

   419         for($x = 0; $x < count($this->tagChildren); $x ++)

   420         {

   421             //Do this recursively

   422             $this->tagChildren[$x]->DeleteChildren();

   423             

   424             //Delete the name and value

   425             $this->tagChildren[$x] = null;

   426             unset($this->tagChildren[$x]);

   427         }

   428     }

   429 }

   430 ?>
author	Robert McIntyre <rlm@mit.edu>
date	Tue, 22 Jun 2010 13:41:04 -0400
parents	3f6b44aa6b35
children