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Current File : C:/xampp/php_8/pear/Text/Wiki.php
<?php
// vim: set expandtab tabstop=4 shiftwidth=4 softtabstop=4:
/**
 * Parse structured wiki text and render into arbitrary formats such as XHTML.
 *
 * PHP versions 4 and 5
 *
 * @category   Text
 * @package    Text_Wiki
 * @author     Paul M. Jones <pmjones@php.net>
 * @license    http://www.gnu.org/copyleft/lesser.html  LGPL License 2.1
 * @version    CVS: $Id: Wiki.php 248433 2007-12-17 16:03:48Z justinpatrin $
 * @link       http://pear.php.net/package/Text_Wiki
 */

/**
 * The baseline abstract parser class.
 */
require_once 'Text/Wiki/Parse.php';

/**
 * The baseline abstract render class.
 */
require_once 'Text/Wiki/Render.php';

/**
 * Parse structured wiki text and render into arbitrary formats such as XHTML.
 *
 * This is the "master" class for handling the management and convenience
 * functions to transform Wiki-formatted text.
 *
 * @category   Text
 * @package    Text_Wiki
 * @author     Paul M. Jones <pmjones@php.net>
 * @license    http://www.gnu.org/copyleft/lesser.html  LGPL License 2.1
 * @version    Release: 1.2.1
 * @link       http://pear.php.net/package/Text_Wiki
 */
class Text_Wiki {

    /**
    *
    * The default list of rules, in order, to apply to the source text.
    *
    * @access public
    *
    * @var array
    *
    */

    var $rules = array(
        'Prefilter',
        'Delimiter',
        'Code',
        'Function',
        'Html',
        'Raw',
        'Include',
        'Embed',
        'Anchor',
        'Heading',
        'Toc',
        'Horiz',
        'Break',
        'Blockquote',
        'List',
        'Deflist',
        'Table',
        'Image',
        'Phplookup',
        'Center',
        'Newline',
        'Paragraph',
        'Url',
        'Freelink',
        'Interwiki',
        'Wikilink',
        'Colortext',
        'Strong',
        'Bold',
        'Emphasis',
        'Italic',
        'Underline',
        'Tt',
        'Superscript',
        'Subscript',
        'Revise',
        'Tighten'
    );


    /**
    *
    * The list of rules to not-apply to the source text.
    *
    * @access public
    *
    * @var array
    *
    */

    var $disable = array(
        'Html',
        'Include',
        'Embed'
    );


    /**
    *
    * Custom configuration for rules at the parsing stage.
    *
    * In this array, the key is the parsing rule name, and the value is
    * an array of key-value configuration pairs corresponding to the $conf
    * property in the target parsing rule.
    *
    * For example:
    *
    * <code>
    * $parseConf = array(
    *     'Include' => array(
    *         'base' => '/path/to/scripts/'
    *     )
    * );
    * </code>
    *
    * Note that most default rules do not need any parsing configuration.
    *
    * @access public
    *
    * @var array
    *
    */

    var $parseConf = array();


    /**
    *
    * Custom configuration for rules at the rendering stage.
    *
    * Because rendering may be different for each target format, the
    * first-level element in this array is always a format name (e.g.,
    * 'Xhtml').
    *
    * Within that first level element, the subsequent elements match the
    * $parseConf format. That is, the sub-key is the rendering rule name,
    * and the sub-value is an array of key-value configuration pairs
    * corresponding to the $conf property in the target rendering rule.
    *
    * @access public
    *
    * @var array
    *
    */

    var $renderConf = array(
        'Docbook' => array(),
        'Latex' => array(),
        'Pdf' => array(),
        'Plain' => array(),
        'Rtf' => array(),
        'Xhtml' => array()
    );


    /**
    *
    * Custom configuration for the output format itself.
    *
    * Even though Text_Wiki will render the tokens from parsed text,
    * the format itself may require some configuration.  For example,
    * RTF needs to know font names and sizes, PDF requires page layout
    * information, and DocBook needs a section hierarchy.  This array
    * matches the $conf property of the the format-level renderer
    * (e.g., Text_Wiki_Render_Xhtml).
    *
    * In this array, the key is the rendering format name, and the value is
    * an array of key-value configuration pairs corresponding to the $conf
    * property in the rendering format rule.
    *
    * @access public
    *
    * @var array
    *
    */

    var $formatConf = array(
        'Docbook' => array(),
        'Latex' => array(),
        'Pdf' => array(),
        'Plain' => array(),
        'Rtf' => array(),
        'Xhtml' => array()
    );


    /**
    *
    * The delimiter for token numbers of parsed elements in source text.
    *
    * @access public
    *
    * @var string
    *
    */

    var $delim = "\31";


    /**
    *
    * The tokens generated by rules as the source text is parsed.
    *
    * As Text_Wiki applies rule classes to the source text, it will
    * replace portions of the text with a delimited token number.  This
    * is the array of those tokens, representing the replaced text and
    * any options set by the parser for that replaced text.
    *
    * The tokens array is sequential; each element is itself a sequential
    * array where element 0 is the name of the rule that generated the
    * token, and element 1 is an associative array where the key is an
    * option name and the value is an option value.
    *
    * @access private
    *
    * @var array
    *
    */

    var $tokens = array();

    /**
    * How many tokens generated pro rules.
    *
    * Intended to load only necessary render objects
    *
    * @access private
    * @var array
    */
    var $_countRulesTokens = array();


    /**
    *
    * The source text to which rules will be applied.
    *
    * This text will be transformed in-place, which means that it will
    * change as the rules are applied.
    *
    * @access private
    *
    * @var string
    *
    */

    var $source = '';

    /**
     * The output text
     *
     * @var string
     */
    var $output = '';


    /**
    *
    * Array of rule parsers.
    *
    * Text_Wiki creates one instance of every rule that is applied to
    * the source text; this array holds those instances.  The array key
    * is the rule name, and the array value is an instance of the rule
    * class.
    *
    * @access private
    *
    * @var array
    *
    */

    var $parseObj = array();


    /**
    *
    * Array of rule renderers.
    *
    * Text_Wiki creates one instance of every rule that is applied to
    * the source text; this array holds those instances.  The array key
    * is the rule name, and the array value is an instance of the rule
    * class.
    *
    * @access private
    *
    * @var array
    *
    */

    var $renderObj = array();


    /**
    *
    * Array of format renderers.
    *
    * @access private
    *
    * @var array
    *
    */

    var $formatObj = array();


    /**
    *
    * Array of paths to search, in order, for parsing and rendering rules.
    *
    * @access private
    *
    * @var array
    *
    */

    var $path = array(
        'parse' => array(),
        'render' => array()
    );



    /**
    *
    * The directory separator character.
    *
    * @access private
    *
    * @var string
    *
    */

    var $_dirSep = DIRECTORY_SEPARATOR;

    /**
     * Temporary configuration variable
     *
     * @var string
     */
    var $renderingType = 'normal';

    /**
     * Stack of rendering callbacks
     *
     * @var Array
     */
    var $_renderCallbacks = array();

    /**
     * Current output block
     *
     * @var string
     */
    var $_block;

    /**
     * A stack of blocks
     *
     * @param Array
     */
    var $_blocks;

    /**
    *
    * Constructor.
    *
    * **DEPRECATED**
    * Please use the singleton() or factory() methods.
    *
    * @access public
    *
    * @param array $rules The set of rules to load for this object.  Defaults
    *   to null, which will load the default ruleset for this parser.
    */

    function Text_Wiki($rules = null)
    {
        if (is_array($rules)) {
            $this->rules = array();
            foreach ($rules as $rule) {
                $this->rules[] = ucfirst($rule);
            }
        }

        $this->addPath(
            'parse',
            $this->fixPath(dirname(__FILE__)) . 'Wiki/Parse/Default/'
        );
        $this->addPath(
            'render',
            $this->fixPath(dirname(__FILE__)) . 'Wiki/Render/'
        );

    }

    /**
    * Singleton.
    *
    * This avoids instantiating multiple Text_Wiki instances where a number
    * of objects are required in one call, e.g. to save memory in a
    * CMS invironment where several parsers are required in a single page.
    *
    * $single = & singleton();
    *
    * or
    *
    * $single = & singleton('Parser', array('Prefilter', 'Delimiter', 'Code', 'Function',
    *   'Html', 'Raw', 'Include', 'Embed', 'Anchor', 'Heading', 'Toc', 'Horiz',
    *   'Break', 'Blockquote', 'List', 'Deflist', 'Table', 'Image', 'Phplookup',
    *   'Center', 'Newline', 'Paragraph', 'Url', 'Freelink', 'Interwiki', 'Wikilink',
    *   'Colortext', 'Strong', 'Bold', 'Emphasis', 'Italic', 'Underline', 'Tt',
    *   'Superscript', 'Subscript', 'Revise', 'Tighten'));
    *
    * Call using a subset of this list.  The order of passing rulesets in the
    * $rules array is important!
    *
    * After calling this, call $single->setParseConf(), setRenderConf() or setFormatConf()
    * as usual for a constructed object of this class.
    *
    * The internal static array of singleton objects has no index on the parser
    * rules, the only index is on the parser name.  So if you call this multiple
    * times with different rules but the same parser name, you will get the same
    * static parser object each time.
    *
    * @access public
    * @static
    * @since Method available since Release 1.1.0
    * @param string $parser The parser to be used (defaults to 'Default').
    * @param array $rules   The set of rules to instantiate the object. This
    *    will only be used when the first call to singleton is made, if included
    *    in further calls it will be effectively ignored.
    * @return &object a reference to the Text_Wiki unique instantiation.
    */
    function &singleton($parser = 'Default', $rules = null)
    {
        static $only = array();
        if (!isset($only[$parser])) {
            $ret = & Text_Wiki::factory($parser, $rules);
            if (Text_Wiki::isError($ret)) {
                return $ret;
            }
            $only[$parser] =& $ret;
        }
        return $only[$parser];
    }

    /**
     * Returns a Text_Wiki Parser class for the specified parser.
     *
     * @access public
     * @static
     * @param string $parser The name of the parse to instantiate
     * you need to have Text_Wiki_XXX installed to use $parser = 'XXX', it's E_FATAL
     * @param array $rules The rules to pass into the constructor
     *    {@see Text_Wiki::singleton} for a list of rules
     * @return Text_Wiki a Parser object extended from Text_Wiki
     */
    function &factory($parser = 'Default', $rules = null)
    {
        $class = 'Text_Wiki_' . $parser;
        $file = str_replace('_', '/', $class).'.php';
        if (!class_exists($class)) {
            require_once $file;
            if (!class_exists($class)) {
                return Text_Wiki::error(
                    'Class ' . $class . ' does not exist after requiring '. $file .
                        ', install package ' . $class . "\n");
            }
        }

        $obj =& new $class($rules);
        return $obj;
    }

    /**
    *
    * Set parser configuration for a specific rule and key.
    *
    * @access public
    *
    * @param string $rule The parse rule to set config for.
    *
    * @param array|string $arg1 The full config array to use for the
    * parse rule, or a conf key in that array.
    *
    * @param string $arg2 The config value for the key.
    *
    * @return void
    *
    */

    function setParseConf($rule, $arg1, $arg2 = null)
    {
        $rule = ucwords(strtolower($rule));

        if (! isset($this->parseConf[$rule])) {
            $this->parseConf[$rule] = array();
        }

        // if first arg is an array, use it as the entire
        // conf array for the rule.  otherwise, treat arg1
        // as a key and arg2 as a value for the rule conf.
        if (is_array($arg1)) {
            $this->parseConf[$rule] = $arg1;
        } else {
            $this->parseConf[$rule][$arg1] = $arg2;
        }
    }


    /**
    *
    * Get parser configuration for a specific rule and key.
    *
    * @access public
    *
    * @param string $rule The parse rule to get config for.
    *
    * @param string $key A key in the conf array; if null,
    * returns the entire conf array.
    *
    * @return mixed The whole conf array if no key is specified,
    * or the specific conf key value.
    *
    */

    function getParseConf($rule, $key = null)
    {
        $rule = ucwords(strtolower($rule));

        // the rule does not exist
        if (! isset($this->parseConf[$rule])) {
            return null;
        }

        // no key requested, return the whole array
        if (is_null($key)) {
            return $this->parseConf[$rule];
        }

        // does the requested key exist?
        if (isset($this->parseConf[$rule][$key])) {
            // yes, return that value
            return $this->parseConf[$rule][$key];
        } else {
            // no
            return null;
        }
    }


    /**
    *
    * Set renderer configuration for a specific format, rule, and key.
    *
    * @access public
    *
    * @param string $format The render format to set config for.
    *
    * @param string $rule The render rule to set config for in the format.
    *
    * @param array|string $arg1 The config array, or the config key
    * within the render rule.
    *
    * @param string $arg2 The config value for the key.
    *
    * @return void
    *
    */

    function setRenderConf($format, $rule, $arg1, $arg2 = null)
    {
        $format = ucwords(strtolower($format));
        $rule = ucwords(strtolower($rule));

        if (! isset($this->renderConf[$format])) {
            $this->renderConf[$format] = array();
        }

        if (! isset($this->renderConf[$format][$rule])) {
            $this->renderConf[$format][$rule] = array();
        }

        // if first arg is an array, use it as the entire
        // conf array for the render rule.  otherwise, treat arg1
        // as a key and arg2 as a value for the render rule conf.
        if (is_array($arg1)) {
            $this->renderConf[$format][$rule] = $arg1;
        } else {
            $this->renderConf[$format][$rule][$arg1] = $arg2;
        }
    }


    /**
    *
    * Get renderer configuration for a specific format, rule, and key.
    *
    * @access public
    *
    * @param string $format The render format to get config for.
    *
    * @param string $rule The render format rule to get config for.
    *
    * @param string $key A key in the conf array; if null,
    * returns the entire conf array.
    *
    * @return mixed The whole conf array if no key is specified,
    * or the specific conf key value.
    *
    */

    function getRenderConf($format, $rule, $key = null)
    {
        $format = ucwords(strtolower($format));
        $rule = ucwords(strtolower($rule));

        if (! isset($this->renderConf[$format]) ||
            ! isset($this->renderConf[$format][$rule])) {
            return null;
        }

        // no key requested, return the whole array
        if (is_null($key)) {
            return $this->renderConf[$format][$rule];
        }

        // does the requested key exist?
        if (isset($this->renderConf[$format][$rule][$key])) {
            // yes, return that value
            return $this->renderConf[$format][$rule][$key];
        } else {
            // no
            return null;
        }

    }

    /**
    *
    * Set format configuration for a specific rule and key.
    *
    * @access public
    *
    * @param string $format The format to set config for.
    *
    * @param string $key The config key within the format.
    *
    * @param string $val The config value for the key.
    *
    * @return void
    *
    */

    function setFormatConf($format, $arg1, $arg2 = null)
    {
        if (! is_array($this->formatConf[$format])) {
            $this->formatConf[$format] = array();
        }

        // if first arg is an array, use it as the entire
        // conf array for the format.  otherwise, treat arg1
        // as a key and arg2 as a value for the format conf.
        if (is_array($arg1)) {
            $this->formatConf[$format] = $arg1;
        } else {
            $this->formatConf[$format][$arg1] = $arg2;
        }
    }



    /**
    *
    * Get configuration for a specific format and key.
    *
    * @access public
    *
    * @param string $format The format to get config for.
    *
    * @param mixed $key A key in the conf array; if null,
    * returns the entire conf array.
    *
    * @return mixed The whole conf array if no key is specified,
    * or the specific conf key value.
    *
    */

    function getFormatConf($format, $key = null)
    {
        // the format does not exist
        if (! isset($this->formatConf[$format])) {
            return null;
        }

        // no key requested, return the whole array
        if (is_null($key)) {
            return $this->formatConf[$format];
        }

        // does the requested key exist?
        if (isset($this->formatConf[$format][$key])) {
            // yes, return that value
            return $this->formatConf[$format][$key];
        } else {
            // no
            return null;
        }
    }


    /**
    *
    * Inserts a rule into to the rule set.
    *
    * @access public
    *
    * @param string $name The name of the rule.  Should be different from
    * all other keys in the rule set.
    *
    * @param string $tgt The rule after which to insert this new rule.  By
    * default (null) the rule is inserted at the end; if set to '', inserts
    * at the beginning.
    *
    * @return void
    *
    */

    function insertRule($name, $tgt = null)
    {
        $name = ucwords(strtolower($name));
        if (! is_null($tgt)) {
            $tgt = ucwords(strtolower($tgt));
        }

        // does the rule name to be inserted already exist?
        if (in_array($name, $this->rules)) {
            // yes, return
            return null;
        }

        // the target name is not null, and not '', but does not exist
        // in the list of rules. this means we're trying to insert after
        // a target key, but the target key isn't there.
        if (! is_null($tgt) && $tgt != '' &&
            ! in_array($tgt, $this->rules)) {
            return false;
        }

        // if $tgt is null, insert at the end.  We know this is at the
        // end (instead of resetting an existing rule) becuase we exited
        // at the top of this method if the rule was already in place.
        if (is_null($tgt)) {
            $this->rules[] = $name;
            return true;
        }

        // save a copy of the current rules, then reset the rule set
        // so we can insert in the proper place later.
        // where to insert the rule?
        if ($tgt == '') {
            // insert at the beginning
            array_unshift($this->rules, $name);
            return true;
        }

        // insert after the named rule
        $tmp = $this->rules;
        $this->rules = array();

        foreach ($tmp as $val) {
            $this->rules[] = $val;
            if ($val == $tgt) {
                $this->rules[] = $name;
            }
        }

        return true;

    }


    /**
    *
    * Delete (remove or unset) a rule from the $rules property.
    *
    * @access public
    *
    * @param string $rule The name of the rule to remove.
    *
    * @return void
    *
    */

    function deleteRule($name)
    {
        $name = ucwords(strtolower($name));
        $key = array_search($name, $this->rules);
        if ($key !== false) {
            unset($this->rules[$key]);
        }
    }


    /**
    *
    * Change from one rule to another in-place.
    *
    * @access public
    *
    * @param string $old The name of the rule to change from.
    *
    * @param string $new The name of the rule to change to.
    *
    * @return void
    *
    */

    function changeRule($old, $new)
    {
        $old = ucwords(strtolower($old));
        $new = ucwords(strtolower($new));
        $key = array_search($old, $this->rules);
        if ($key !== false) {
            // delete the new name , case it was already there
            $this->deleteRule($new);
            $this->rules[$key] = $new;
        }
    }


    /**
    *
    * Enables a rule so that it is applied when parsing.
    *
    * @access public
    *
    * @param string $rule The name of the rule to enable.
    *
    * @return void
    *
    */

    function enableRule($name)
    {
        $name = ucwords(strtolower($name));
        $key = array_search($name, $this->disable);
        if ($key !== false) {
            unset($this->disable[$key]);
        }
    }


    /**
    *
    * Disables a rule so that it is not applied when parsing.
    *
    * @access public
    *
    * @param string $rule The name of the rule to disable.
    *
    * @return void
    *
    */

    function disableRule($name)
    {
        $name = ucwords(strtolower($name));
        $key = array_search($name, $this->disable);
        if ($key === false) {
            $this->disable[] = $name;
        }
    }


    /**
    *
    * Parses and renders the text passed to it, and returns the results.
    *
    * First, the method parses the source text, applying rules to the
    * text as it goes.  These rules will modify the source text
    * in-place, replacing some text with delimited tokens (and
    * populating the $this->tokens array as it goes).
    *
    * Next, the method renders the in-place tokens into the requested
    * output format.
    *
    * Finally, the method returns the transformed text.  Note that the
    * source text is transformed in place; once it is transformed, it is
    * no longer the same as the original source text.
    *
    * @access public
    *
    * @param string $text The source text to which wiki rules should be
    * applied, both for parsing and for rendering.
    *
    * @param string $format The target output format, typically 'xhtml'.
    *  If a rule does not support a given format, the output from that
    * rule is rule-specific.
    *
    * @return string The transformed wiki text.
    *
    */

    function transform($text, $format = 'Xhtml')
    {
        $this->parse($text);
        return $this->render($format);
    }


    /**
    *
    * Sets the $_source text property, then parses it in place and
    * retains tokens in the $_tokens array property.
    *
    * @access public
    *
    * @param string $text The source text to which wiki rules should be
    * applied, both for parsing and for rendering.
    *
    * @return void
    *
    */

    function parse($text)
    {
        // set the object property for the source text
        $this->source = $text;

        // reset the tokens.
        $this->tokens = array();
        $this->_countRulesTokens = array();

        // apply the parse() method of each requested rule to the source
        // text.
        foreach ($this->rules as $name) {
            // do not parse the rules listed in $disable
            if (! in_array($name, $this->disable)) {

                // load the parsing object
                $this->loadParseObj($name);

                // load may have failed; only parse if
                // an object is in the array now
                if (is_object($this->parseObj[$name])) {
                    $this->parseObj[$name]->parse();
                }
            }
        }
    }


    /**
    *
    * Renders tokens back into the source text, based on the requested format.
    *
    * @access public
    *
    * @param string $format The target output format, typically 'xhtml'.
    * If a rule does not support a given format, the output from that
    * rule is rule-specific.
    *
    * @return string The transformed wiki text.
    *
    */

    function render($format = 'Xhtml')
    {
        // the rendering method we're going to use from each rule
        $format = ucwords(strtolower($format));

        // the eventual output text
        $this->output = '';

        // when passing through the parsed source text, keep track of when
        // we are in a delimited section
        $in_delim = false;

        // when in a delimited section, capture the token key number
        $key = '';

        // load the format object, or crap out if we can't find it
        $result = $this->loadFormatObj($format);
        if ($this->isError($result)) {
            return $result;
        }

        // pre-rendering activity
        if (is_object($this->formatObj[$format])) {
            $this->output .= $this->formatObj[$format]->pre();
        }

        // load the render objects
        foreach (array_keys($this->_countRulesTokens) as $rule) {
            $this->loadRenderObj($format, $rule);
        }

        if ($this->renderingType == 'preg') {
            $this->output = preg_replace_callback('/'.$this->delim.'(\d+)'.$this->delim.'/',
                                            array(&$this, '_renderToken'),
                                            $this->source);
            /*
//Damn strtok()! Why does it "skip" empty parts of the string. It's useless now!
        } elseif ($this->renderingType == 'strtok') {
            echo '<pre>'.htmlentities($this->source).'</pre>';
            $t = strtok($this->source, $this->delim);
            $inToken = true;
            $i = 0;
            while ($t !== false) {
                echo 'Token: '.$i.'<pre>"'.htmlentities($t).'"</pre><br/><br/>';
                if ($inToken) {
                    //$this->output .= $this->renderObj[$this->tokens[$t][0]]->token($this->tokens[$t][1]);
                } else {
                    $this->output .= $t;
                }
                $inToken = !$inToken;
                $t = strtok($this->delim);
                ++$i;
            }
            */
        } else {
            // pass through the parsed source text character by character
            $this->_block = '';
            $tokenStack = array();
            $k = strlen($this->source);
            for ($i = 0; $i < $k; $i++) {

                // the current character
                $char = $this->source{$i};

                // are alredy in a delimited section?
                if ($in_delim) {

                    // yes; are we ending the section?
                    if ($char == $this->delim) {

                        if (count($this->_renderCallbacks) == 0) {
                            $this->output .= $this->_block;
                            $this->_block = '';
                        }
                        if (isset($opts['type'])) {
                            if ($opts['type'] == 'start') {
                                array_push($tokenStack, $rule);
                            } elseif ($opts['type'] == 'end') {
                                if ($tokenStack[count($tokenStack) - 1] != $rule) {
                                    return Text_Wiki::error('Unbalanced tokens, check your syntax');
                                } else {
                                    array_pop($tokenStack);
                                }
                            }
                        }

                        // yes, get the replacement text for the delimited
                        // token number and unset the flag.
                        $key = (int)$key;
                        $rule = $this->tokens[$key][0];
                        $opts = $this->tokens[$key][1];
                        $this->_block .= $this->renderObj[$rule]->token($opts);
                        $in_delim = false;

                    } else {

                        // no, add to the delimited token key number
                        $key .= $char;

                    }

                } else {

                    // not currently in a delimited section.
                    // are we starting into a delimited section?
                    if ($char == $this->delim) {
                        // yes, reset the previous key and
                        // set the flag.
                        $key = '';
                        $in_delim = true;

                    } else {
                        // no, add to the output as-is
                        $this->_block .= $char;
                    }
                }
            }
        }

        if (count($this->_renderCallbacks)) {
            return $this->error('Render callbacks left over after processing finished');
        }
        /*
        while (count($this->_renderCallbacks)) {
            $this->popRenderCallback();
        }
        */
        if (strlen($this->_block)) {
            $this->output .= $this->_block;
            $this->_block = '';
        }

        // post-rendering activity
        if (is_object($this->formatObj[$format])) {
            $this->output .= $this->formatObj[$format]->post();
        }

        // return the rendered source text.
        return $this->output;
    }

    /**
     * Renders a token, for use only as an internal callback
     *
     * @param array Matches from preg_rpelace_callback, [1] is the token number
     * @return string The rendered text for the token
     * @access private
     */
    function _renderToken($matches) {
        return $this->renderObj[$this->tokens[$matches[1]][0]]->token($this->tokens[$matches[1]][1]);
    }

    function registerRenderCallback($callback) {
        $this->_blocks[] = $this->_block;
        $this->_block = '';
        $this->_renderCallbacks[] = $callback;
    }

    function popRenderCallback() {
        if (count($this->_renderCallbacks) == 0) {
            return Text_Wiki::error('Render callback popped when no render callbacks in stack');
        } else {
            $callback = array_pop($this->_renderCallbacks);
            $this->_block = call_user_func($callback, $this->_block);
            if (count($this->_blocks)) {
                $parentBlock = array_pop($this->_blocks);
                $this->_block = $parentBlock.$this->_block;
            }
            if (count($this->_renderCallbacks) == 0) {
                $this->output .= $this->_block;
                $this->_block = '';
            }
        }
    }

    /**
    *
    * Returns the parsed source text with delimited token placeholders.
    *
    * @access public
    *
    * @return string The parsed source text.
    *
    */

    function getSource()
    {
        return $this->source;
    }


    /**
    *
    * Returns tokens that have been parsed out of the source text.
    *
    * @access public
    *
    * @param array $rules If an array of rule names is passed, only return
    * tokens matching these rule names.  If no array is passed, return all
    * tokens.
    *
    * @return array An array of tokens.
    *
    */

    function getTokens($rules = null)
    {
        if (is_null($rules)) {
            return $this->tokens;
        } else {
            settype($rules, 'array');
            $result = array();
            foreach ($this->tokens as $key => $val) {
                if (in_array($val[0], $rules)) {
                    $result[$key] = $val;
                }
            }
            return $result;
        }
    }


    /**
    *
    * Add a token to the Text_Wiki tokens array, and return a delimited
    * token number.
    *
    * @access public
    *
    * @param array $options An associative array of options for the new
    * token array element.  The keys and values are specific to the
    * rule, and may or may not be common to other rule options.  Typical
    * options keys are 'text' and 'type' but may include others.
    *
    * @param boolean $id_only If true, return only the token number, not
    * a delimited token string.
    *
    * @return string|int By default, return the number of the
    * newly-created token array element with a delimiter prefix and
    * suffix; however, if $id_only is set to true, return only the token
    * number (no delimiters).
    *
    */

    function addToken($rule, $options = array(), $id_only = false)
    {
        // increment the token ID number.  note that if you parse
        // multiple times with the same Text_Wiki object, the ID number
        // will not reset to zero.
        static $id;
        if (! isset($id)) {
            $id = 0;
        } else {
            $id ++;
        }

        // force the options to be an array
        settype($options, 'array');

        // add the token
        $this->tokens[$id] = array(
            0 => $rule,
            1 => $options
        );
        if (!isset($this->_countRulesTokens[$rule])) {
            $this->_countRulesTokens[$rule] = 1;
        } else {
            ++$this->_countRulesTokens[$rule];
        }

        // return a value
        if ($id_only) {
            // return the last token number
            return $id;
        } else {
            // return the token number with delimiters
            return $this->delim . $id . $this->delim;
        }
    }


    /**
    *
    * Set or re-set a token with specific information, overwriting any
    * previous rule name and rule options.
    *
    * @access public
    *
    * @param int $id The token number to reset.
    *
    * @param int $rule The rule name to use.
    *
    * @param array $options An associative array of options for the
    * token array element.  The keys and values are specific to the
    * rule, and may or may not be common to other rule options.  Typical
    * options keys are 'text' and 'type' but may include others.
    *
    * @return void
    *
    */

    function setToken($id, $rule, $options = array())
    {
        $oldRule = $this->tokens[$id][0];
        // reset the token
        $this->tokens[$id] = array(
            0 => $rule,
            1 => $options
        );
        if ($rule != $oldRule) {
            if (!($this->_countRulesTokens[$oldRule]--)) {
                unset($this->_countRulesTokens[$oldRule]);
            }
            if (!isset($this->_countRulesTokens[$rule])) {
                $this->_countRulesTokens[$rule] = 1;
            } else {
                ++$this->_countRulesTokens[$rule];
            }
        }
    }


    /**
    *
    * Load a rule parser class file.
    *
    * @access public
    *
    * @return bool True if loaded, false if not.
    *
    */

    function loadParseObj($rule)
    {
        $rule = ucwords(strtolower($rule));
        $file = $rule . '.php';
        $class = "Text_Wiki_Parse_$rule";

        if (! class_exists($class)) {
            $loc = $this->findFile('parse', $file);
            if ($loc) {
                // found the class
                include_once $loc;
            } else {
                // can't find the class
                $this->parseObj[$rule] = null;
                // can't find the class
                return $this->error(
                    "Parse rule '$rule' not found"
                );
            }
        }

        $this->parseObj[$rule] =& new $class($this);

    }


    /**
    *
    * Load a rule-render class file.
    *
    * @access public
    *
    * @return bool True if loaded, false if not.
    *
    */

    function loadRenderObj($format, $rule)
    {
        $format = ucwords(strtolower($format));
        $rule = ucwords(strtolower($rule));
        $file = "$format/$rule.php";
        $class = "Text_Wiki_Render_$format" . "_$rule";

        if (! class_exists($class)) {
            // load the class
            $loc = $this->findFile('render', $file);
            if ($loc) {
                // found the class
                include_once $loc;
            } else {
                // can't find the class
                return $this->error(
                    "Render rule '$rule' in format '$format' not found"
                );
            }
        }

        $this->renderObj[$rule] =& new $class($this);
    }


    /**
    *
    * Load a format-render class file.
    *
    * @access public
    *
    * @return bool True if loaded, false if not.
    *
    */

    function loadFormatObj($format)
    {
        $format = ucwords(strtolower($format));
        $file = $format . '.php';
        $class = "Text_Wiki_Render_$format";

        if (! class_exists($class)) {
            $loc = $this->findFile('render', $file);
            if ($loc) {
                // found the class
                include_once $loc;
            } else {
                // can't find the class
                return $this->error(
                    "Rendering format class '$class' not found"
                );
            }
        }

        $this->formatObj[$format] =& new $class($this);
    }


    /**
    *
    * Add a path to a path array.
    *
    * @access public
    *
    * @param string $type The path-type to add (parse or render).
    *
    * @param string $dir The directory to add to the path-type.
    *
    * @return void
    *
    */

    function addPath($type, $dir)
    {
        $dir = $this->fixPath($dir);
        if (! isset($this->path[$type])) {
            $this->path[$type] = array($dir);
        } else {
            array_unshift($this->path[$type], $dir);
        }
    }


    /**
    *
    * Get the current path array for a path-type.
    *
    * @access public
    *
    * @param string $type The path-type to look up (plugin, filter, or
    * template).  If not set, returns all path types.
    *
    * @return array The array of paths for the requested type.
    *
    */

    function getPath($type = null)
    {
        if (is_null($type)) {
            return $this->path;
        } elseif (! isset($this->path[$type])) {
            return array();
        } else {
            return $this->path[$type];
        }
    }


    /**
    *
    * Searches a series of paths for a given file.
    *
    * @param array $type The type of paths to search (template, plugin,
    * or filter).
    *
    * @param string $file The file name to look for.
    *
    * @return string|bool The full path and file name for the target file,
    * or boolean false if the file is not found in any of the paths.
    *
    */

    function findFile($type, $file)
    {
        // get the set of paths
        $set = $this->getPath($type);

        // start looping through them
        foreach ($set as $path) {
            $fullname = $path . $file;
            if (file_exists($fullname) && is_readable($fullname)) {
                return $fullname;
            }
        }

        // could not find the file in the set of paths
        return false;
    }


    /**
    *
    * Append a trailing '/' to paths, unless the path is empty.
    *
    * @access private
    *
    * @param string $path The file path to fix
    *
    * @return string The fixed file path
    *
    */

    function fixPath($path)
    {
        $len = strlen($this->_dirSep);

        if (! empty($path) &&
            substr($path, -1 * $len, $len) != $this->_dirSep)    {
            return $path . $this->_dirSep;
        } else {
            return $path;
        }
    }


    /**
    *
    * Simple error-object generator.
    *
    * @access public
    *
    * @param string $message The error message.
    *
    * @return object PEAR_Error
    *
    */

    function &error($message)
    {
        if (! class_exists('PEAR_Error')) {
            include_once 'PEAR.php';
        }
        return PEAR::throwError($message);
    }


    /**
    *
    * Simple error checker.
    *
    * @access public
    *
    * @param mixed $obj Check if this is a PEAR_Error object or not.
    *
    * @return bool True if a PEAR_Error, false if not.
    *
    */

    function isError(&$obj)
    {
        return is_a($obj, 'PEAR_Error');
    }
}

?>

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