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<?php
// vim: set expandtab tabstop=4 shiftwidth=4 softtabstop=4:
/**
* Baseline rule class for extension into a "real" parser component.
*
* 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: Parse.php,v 1.5 2005/07/29 08:57:29 toggg Exp $
* @link http://pear.php.net/package/Text_Wiki
*/
/**
* Baseline rule class for extension into a "real" parser component.
*
* Text_Wiki_Rule classes do not stand on their own; they are called by a
* Text_Wiki object, typcially in the transform() method. Each rule class
* performs three main activities: parse, process, and render.
*
* The parse() method takes a regex and applies it to the whole block of
* source text at one time. Each match is sent as $matches to the
* process() method.
*
* The process() method acts on the matched text from the source, and
* then processes the source text is some way. This may mean the
* creation of a delimited token using addToken(). In every case, the
* process() method returns the text that should replace the matched text
* from parse().
*
* @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: @package_version@
* @link http://pear.php.net/package/Text_Wiki
*/
class Text_Wiki_Parse {
/**
*
* Configuration options for this parser rule.
*
* @access public
*
* @var string
*
*/
var $conf = array();
/**
*
* Regular expression to find matching text for this rule.
*
* @access public
*
* @var string
*
* @see parse()
*
*/
var $regex = null;
/**
*
* The name of this rule for new token array elements.
*
* @access public
*
* @var string
*
*/
var $rule = null;
/**
*
* A reference to the calling Text_Wiki object.
*
* This is needed so that each rule has access to the same source
* text, token set, URLs, interwiki maps, page names, etc.
*
* @access public
*
* @var object
*/
var $wiki = null;
/**
*
* Constructor for this parser rule.
*
* @access public
*
* @param object &$obj The calling "parent" Text_Wiki object.
*
*/
function Text_Wiki_Parse(&$obj)
{
// set the reference to the calling Text_Wiki object;
// this allows us access to the shared source text, token
// array, etc.
$this->wiki =& $obj;
// set the name of this rule; generally used when adding
// to the tokens array. strip off the Text_Wiki_Parse_ portion.
// text_wiki_parse_
// 0123456789012345
$tmp = substr(get_class($this), 16);
$this->rule = ucwords(strtolower($tmp));
// override config options for the rule if specified
if (isset($this->wiki->parseConf[$this->rule]) &&
is_array($this->wiki->parseConf[$this->rule])) {
$this->conf = array_merge(
$this->conf,
$this->wiki->parseConf[$this->rule]
);
}
}
/**
*
* Abstrct method to parse source text for matches.
*
* Applies the rule's regular expression to the source text, passes
* every match to the process() method, and replaces the matched text
* with the results of the processing.
*
* @access public
*
* @see Text_Wiki_Parse::process()
*
*/
function parse()
{
$this->wiki->source = preg_replace_callback(
$this->regex,
array(&$this, 'process'),
$this->wiki->source
);
}
/**
*
* Abstract method to generate replacements for matched text.
*
* @access public
*
* @param array $matches An array of matches from the parse() method
* as generated by preg_replace_callback. $matches[0] is the full
* matched string, $matches[1] is the first matched pattern,
* $matches[2] is the second matched pattern, and so on.
*
* @return string The processed text replacement; defaults to the
* full matched string (i.e., no changes to the text).
*
* @see Text_Wiki_Parse::parse()
*
*/
function process(&$matches)
{
return $matches[0];
}
/**
*
* Simple method to safely get configuration key values.
*
* @access public
*
* @param string $key The configuration key.
*
* @param mixed $default If the key does not exist, return this value
* instead.
*
* @return mixed The configuration key value (if it exists) or the
* default value (if not).
*
*/
function getConf($key, $default = null)
{
if (isset($this->conf[$key])) {
return $this->conf[$key];
} else {
return $default;
}
}
/**
*
* Extract 'attribute="value"' portions of wiki markup.
*
* This kind of markup is typically used only in macros, but is useful
* anywhere.
*
* The syntax is pretty strict; there can be no spaces between the
* option name, the equals, and the first double-quote; the value
* must be surrounded by double-quotes. You can escape characters in
* the value with a backslash, and the backslash will be stripped for
* you.
*
* @access public
*
* @param string $text The "attributes" portion of markup.
*
* @return array An associative array of key-value pairs where the
* key is the option name and the value is the option value.
*
*/
function getAttrs($text)
{
// find the =" sections;
$tmp = explode('="', trim($text));
// basic setup
$k = count($tmp) - 1;
$attrs = array();
$key = null;
// loop through the sections
foreach ($tmp as $i => $val) {
// first element is always the first key
if ($i == 0) {
$key = trim($val);
continue;
}
// find the last double-quote in the value.
// the part to the left is the value for the last key,
// the part to the right is the next key name
$pos = strrpos($val, '"');
$attrs[$key] = stripslashes(substr($val, 0, $pos));
$key = trim(substr($val, $pos+1));
}
return $attrs;
}
}
?>
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