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/* Unobtrustive Code Highlighter By Dan Webb 11/2005 Version: 0.4 */

var CodeHighlighter = { styleSets : new Array };

CodeHighlighter.addStyle = function(name, rules) {
if ([].push) this.styleSets.push({
name : name,
rules : rules,
ignoreCase : arguments[2] || false
})

function setEvent() {
var old = window.onload;

if (typeof window.onload != 'function') {
window.onload = function() { CodeHighlighter.init() }
} else {
window.onload = function() {
oldonload();
CodeHighlighter.init();
}
}
}

if (this.styleSets.length==1) setEvent();
}

CodeHighlighter.init = function() {
if (!document.getElementsByTagName) return;
if ("a".replace(/a/, function() {return "b"}) != "b") return;

var codeEls = document.getElementsByTagName("CODE");
codeEls.filter = function(f) {
var a =  new Array;
for (var i = 0; i < this.length; i++) if (f(this[i])) a[a.length] = this[i];
return a;
}

var rules = new Array;
rules.toString = function() {
var exps = new Array;
for (var i = 0; i < this.length; i++) exps.push(this[i].exp);
return exps.join("|");
}

function addRule(className, rule) {
var exp = (typeof rule.exp != "string")?String(rule.exp).substr(1, String(rule.exp).length-2):rule.exp;
rules.push({
className : className,
exp : "(" + exp + ")",
length : (exp.match(/(^|[^])([^?]/g) || "").length + 1,
replacement : rule.replacement || null
});
}

function parse(text, ignoreCase) {
return text.replace(new RegExp(rules, (ignoreCase)?"gi":"g"), function() {
var i = 0, j = 1, rule;
while (rule = rules[i++]) {
if (arguments[j]) {
if (!rule.replacement) return "<span class="" + rule.className + "">" + arguments[0] + "</span>";
else {
var str = rule.replacement.replace("$0", rule.className);
for (var k = 1; k <= rule.length - 1; k++) str = str.replace("$" + k, arguments[j + k]);
return str;
}
} else j+= rule.length;
}
});
}

function highlightCode(styleSet) {
var parsed;
rules.length = 0;

var stylableEls = codeEls.filter(function(item) {return (item.className.indexOf(styleSet.name)>=0)});

for (var className in styleSet.rules) addRule(className, styleSet.rules[className]);

for (var i = 0; i < stylableEls.length; i++) {
if (/MSIE/.test(navigator.appVersion) && stylableEls[i].parentNode.nodeName == 'PRE') {
stylableEls[i] = stylableEls[i].parentNode;

parsed = stylableEls[i].innerHTML.replace(/(<code[^>]*>)([^<]*)</code>/i, function() {
return arguments[1] + parse(arguments[2], styleSet.ignoreCase) + "</code>"
});
parsed = parsed.replace(/
( *)/g, function() {
var spaces = "";
for (var i = 0; i < arguments[1].length; i++) spaces+= "&nbsp;";
return "
" + spaces;
});
parsed = parsed.replace(/	/g, "&nbsp;&nbsp;&nbsp;&nbsp;");
parsed = parsed.replace(/
(</w+>)?/g, "<br />$1").replace(/<br />[

s]*<br />/g, "<p><br></p>");

} else parsed = parse(stylableEls[i].innerHTML, styleSet.ignoreCase);

stylableEls[i].innerHTML = parsed;
}
}

for (var i in this.styleSets) highlightCode(this.styleSets[i]);
}

CodeHighlighter.addStyle("css", {
ccomment : {
exp  : //*[^*]**+([^/][^*]**+)*//
},
keyword : {
exp  : /@w[ws]*/
},
selector : {
exp  : "([w-:[.#][^{};>]*)(?={)"
},
property : {
exp  : "([w-]+)(?=s*:)"
},
unit : {
exp  : /([0-9])(em|en|px|%|pt)/,
replacement : "$1<span class="$0">$2</span>"
},
url : {
exp  : /url([^)]*)/
}
});

CodeHighlighter.addStyle("html", {
ccomment : {
exp: /&lt;!s*(--([^-]|[
]|-[^-])*--s*)&gt;/
},
tag : {
exp: /(&lt;/?)([a-zA-Z]+s?)/,
replacement: "$1<span class="$0">$2</span>"
},
string : {
exp  : /'[^']*'|"[^"]*"/
},
attribute : {
exp: /([a-zA-Z-:]+)(=)/,
replacement: "<span class="$0">$1</span>$2"
},
doctype : {
exp: /&lt;!DOCTYPE([^&]|&[^g]|&g[^t])*&gt;/
}
});

CodeHighlighter.addStyle("javascript",{
comment : {
exp  : /(//[^
]*
)|(/*[^*]**+([^/][^*]**+)*/)/
},
brackets : {
exp  : /(|)/
},
string : {
exp  : /'[^']*'|"[^"]*"/
},
keywords : {
exp  : /(arguments|break|case|continue|default|delete|do|else|false|for|function|if|in|instanceof|new|null|return|switch|this|true|typeof|var|void|while|with)/
},
global : {
exp  : /(toString|valueOf|window|element|prototype|constructor|document|escape|unescape|parseInt|parseFloat|setTimeout|clearTimeout|setInterval|clearInterval|NaN|isNaN|Infinity)/
}
});

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