<?php

// Plugin Name: Hyperlight for WordPress

// Plugin URI: http://code.google.com/p/hyperlight

// Description: Static, CSS-based syntax highlighter for a variety of languages.

// Author: Konrad Rudolph

// Version: 0.1.0

// Author URI: http://madrat.net/

require_once('hyperlight/hyperlight.php');

$hyperlight_codes = array();

$hyperlight_replace_token = uniqid('hyperlight', true) . ':';

$hyperlight_code_index = 0;

//

// Wire plugin into WordPress

//

// ToDo Make configurable; include admin interface and head section.

add_filter('the_content', 'hyperlight_before_filter', 1);

add_filter('the_excerpt', 'hyperlight_before_filter', 1);

add_filter('comment_text', 'hyperlight_before_filter', 1);

add_filter('the_content', 'hyperlight_after_filter', 99);

add_filter('the_excerpt', 'hyperlight_after_filter', 99);

add_filter('comment_text', 'hyperlight_after_filter', 99);

// Replace code blocks which specify a `lang` argument with a replace token. The

// token is a key in a dictionary and will be replaced by the after-filter with

// the corresponding highlighted source code.

// TODO Activate similar mechanism for <code>!

function hyperlight_before_filter($content) {

return preg_replace_callback(

'#<pre(.*?)>(.*?)</pre>#is',

'hyperlight_highlight_block',

$content

);

}

// Replace the hyperlight replace tokens with the corresponding highlighted

// source code.

function hyperlight_after_filter($content) {

global $hyperlight_replace_token;

return preg_replace_callback(

"/$hyperlight_replace_token\d+/",

'hyperlight_insert_block',

$content

);

}

function hyperlight_highlight_block($match) {

global $hyperlight_codes, $hyperlight_replace_token, $hyperlight_code_index;

// Notice: a key and its value must NOT be separated by space!

$attributes = preg_split('/\s+/s', trim($match[1]));

$code = $match[2];

if (count($attributes) > 0) {

$new_attr = array();

foreach ($attributes as $attr) {

list($name, $value) = explode('=', $attr);

$new_attr[$name] = $value;

}

$attributes = $new_attr;

}

if (array_key_exists('lang', $attributes)) {

$lang = trim($attributes['lang'], '"\'');

$attributes = array_diff_key($attributes, array('lang' => ''));

}

if (!isset($lang)) return $match[0]; // No language given: don't highlight.

$quote = '"';

$class = "source-code $lang";

if (array_key_exists('class', $attributes)) {

$oldclass = $attributes['class'];

if (substr($oldclass, 0, 1) === "'")

$quote = "'";

$class .= ' ' . trim($oldclass, '"\'');

}

$attributes['class'] = "$quote$class$quote";

$new_attr = array();

foreach ($attributes as $key => $value)

$new_attr[] = "$key=$value";

$attributes = ' ' . implode(' ', $new_attr);

$hyperlight = new Hyperlight($lang);

$code = $hyperlight->render($code);

$index = "$hyperlight_replace_token$hyperlight_code_index";

++$hyperlight_code_index;

$hyperlight_codes[$index] = "<pre$attributes>$code</pre>";

return $index;

}

function hyperlight_insert_block($match) {

global $hyperlight_codes;

return $hyperlight_codes[$match[0]];

}

?>