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 (php4)

    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     var $parser;

    34 

    35     /**

    36     * The XML document

    37     *

    38     * @var string

    39     */

    40     var $xml;

    41 

    42     /**

    43     * Document tag

    44     *

    45     * @var object

    46     */

    47     var $document;

    48 

    49     /**

    50     * Current object depth

    51     *

    52     * @var array

    53     */

    54     var $stack;

    55     /**

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

    57      * names with underscores.

    58      * 

    59      * @var bool

    60      */

    61     var $cleanTagNames;

    62 

    63     

    64     /**

    65      * Constructor. Loads XML document.

    66      *

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

    68      * @return XMLParser

    69      */

    70     function XMLParser($xml = '', $cleanTagNames = true)

    71     {

    72         //Load XML document

    73         $this->xml = $xml;

    74 

    75         // Set stack to an array

    76         $this->stack = array();

    77         

    78         //Set whether or not to clean tag names

    79         $this->cleanTagNames = $cleanTagNames;

    80     }

    81 

    82     /**

    83      * Initiates and runs PHP's XML parser

    84      */

    85     function Parse()

    86     {

    87         //Create the parser resource

    88         $this->parser = xml_parser_create();

    89         

    90         //Set the handlers

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

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

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

    94 

    95         //Error handling

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

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

    98 

    99         //Free the parser

   100         xml_parser_free($this->parser);

   101     }

   102     

   103     /**

   104      * Handles an XML parsing error

   105      *

   106      * @param int $code XML Error Code

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

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

   109      */

   110     function HandleError($code, $line, $col)

   111     {

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

   113     }

   114 

   115     

   116     /**

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

   118      *

   119      * @return string

   120      */

   121     function GenerateXML()

   122     {

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

   124     }

   125 

   126     /**

   127      * Gets the reference to the current direct parent

   128      *

   129      * @return object

   130      */

   131     function GetStackLocation()

   132     {

   133         $return = '';

   134 

   135         foreach($this->stack as $stack)

   136             $return .= $stack.'->';

   137         

   138         return rtrim($return, '->');

   139     }

   140 

   141     /**

   142      * Handler function for the start of a tag

   143      *

   144      * @param resource $parser

   145      * @param string $name

   146      * @param array $attrs

   147      */

   148     function StartElement($parser, $name, $attrs = array())

   149     {

   150         //Make the name of the tag lower case

   151         $name = strtolower($name);

   152         

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

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

   155         {

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

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

   158 

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

   160             $this->stack = array('document');

   161         }

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

   163         else

   164         {

   165             //Get the name which points to the current direct parent, relative to $this

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

   167             

   168             //Add the child

   169             eval('$this->'.$parent.'->AddChild($name, $attrs, '.count($this->stack).', $this->cleanTagNames);');

   170             

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

   172             if($this->cleanTagNames)

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

   174 

   175 

   176             //Update the stack

   177             eval('$this->stack[] = $name.\'[\'.(count($this->'.$parent.'->'.$name.') - 1).\']\';');

   178         }

   179     }

   180 

   181     /**

   182      * Handler function for the end of a tag

   183      *

   184      * @param resource $parser

   185      * @param string $name

   186      */

   187     function EndElement($parser, $name)

   188     {

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

   190         array_pop($this->stack);

   191     }

   192 

   193     /**

   194      * Handler function for the character data within a tag

   195      *

   196      * @param resource $parser

   197      * @param string $data

   198      */

   199     function CharacterData($parser, $data)

   200     {

   201         //Get the reference to the current parent object

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

   203 

   204         //Assign data to it

   205         eval('$this->'.$tag.'->tagData .= trim($data);');

   206     }

   207 }

   208 

   209 

   210 /**

   211  * XML Tag Object (php4)

   212  *

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

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

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

   216  *

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

   218  *

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

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

   221  *

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

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

   224  *

   225  * @version 1.3.0

   226  */

   227 class XMLTag

   228 {

   229     /**

   230      * Array with the attributes of this XML tag

   231      *

   232      * @var array

   233      */

   234     var $tagAttrs;

   235     

   236     /**

   237      * The name of the tag

   238      *

   239      * @var string

   240      */

   241     var $tagName;

   242     

   243     /**

   244      * The data the tag contains 

   245      * 

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

   247      *

   248      * @var string

   249      */

   250     var $tagData;

   251     

   252     /**

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

   254      *

   255      * @var array

   256      */

   257     var $tagChildren;

   258     

   259     /**

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

   261      *

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

   263      *

   264      * @var int

   265      */

   266     var $tagParents;

   267     

   268     /**

   269      * Constructor, sets up all the default values

   270      *

   271      * @param string $name

   272      * @param array $attrs

   273      * @param int $parents

   274      * @return XMLTag

   275      */

   276     function XMLTag($name, $attrs = array(), $parents = 0)

   277     {

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

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

   280         

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

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

   283         

   284         //Set the number of parents

   285         $this->tagParents = $parents;

   286         

   287         //Set the types for children and data

   288         $this->tagChildren = array();

   289         $this->tagData = '';

   290     }

   291     

   292     /**

   293      * Adds a direct child to this object

   294      *

   295      * @param string $name

   296      * @param array $attrs

   297      * @param int $parents

   298      * @param bool $cleanTagName

   299      */

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

   301     {    

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

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

   304         {

   305             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);

   306 

   307             return;

   308         }

   309         

   310         //Create the child object itself

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

   312 

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

   314         if($cleanTagName)

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

   316         

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

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

   319             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, they cannot be accessed and will cause the parser to not work. You must enable the cleanTagName feature (pass true as the second argument of the XMLParser constructor). For more details, see http://www.criticaldevelopment.net/xml/', E_USER_ERROR);

   320             

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

   322         //create an empty array for it

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

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

   325         

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

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

   328         

   329         //Add the reference to the children array member

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

   331     }

   332     

   333     /**

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

   335      * 

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

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

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

   339      * the XML of the entire document.

   340      * 

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

   342      * handled by XMLParser::GetXML()

   343      *

   344      * @return string

   345      */

   346     function GetXML()

   347     {

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

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

   350 

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

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

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

   354         

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

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

   357             $out .= " />";

   358         

   359         //Otherwise...

   360         else

   361         {    

   362             //If there are children

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

   364             {

   365                 //Close off the start tag

   366                 $out .= '>';

   367                 

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

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

   370                 {

   371                     if(is_object($child))

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

   373                 }

   374 

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

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

   377             }

   378             

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

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

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

   382             

   383             //Add the end tag    

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

   385         }

   386         

   387         //Return the final output

   388         return $out;

   389     }

   390     

   391     /**

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

   393      * of $childIndex

   394      *

   395      * @param string $childName

   396      * @param int $childIndex

   397      */

   398     function Delete($childName, $childIndex = 0)

   399     {

   400         //Delete all of the children of that child

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

   402         

   403         //Destroy the child's value

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

   405         

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

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

   408         

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

   410         //values left behind from the above operation

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

   412         {

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

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

   415         }

   416     }

   417     

   418     /**

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

   420      */

   421     function DeleteChildren()

   422     {

   423         //Loop through all child tags

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

   425         {

   426             //Do this recursively

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

   428             

   429             //Delete the name and value

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

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

   432         }

   433     }

   434 }

   435 ?>
author	Robert McIntyre <rlm@mit.edu>
date	Mon, 11 Jul 2011 02:43:59 -0400
parents	3f6b44aa6b35
children