diff options
Diffstat (limited to 'railties/guides/files/javascripts/code_highlighter.js')
| -rwxr-xr-x | railties/guides/files/javascripts/code_highlighter.js | 188 |
1 files changed, 188 insertions, 0 deletions
diff --git a/railties/guides/files/javascripts/code_highlighter.js b/railties/guides/files/javascripts/code_highlighter.js new file mode 100755 index 0000000000..a234ba888c --- /dev/null +++ b/railties/guides/files/javascripts/code_highlighter.js @@ -0,0 +1,188 @@ +/* Unobtrustive Code Highlighter By Dan Webb 11/2005 + Version: 0.4 + + Usage: + Add a script tag for this script and any stylesets you need to use + to the page in question, add correct class names to CODE elements, + define CSS styles for elements. That's it! + + Known to work on: + IE 5.5+ PC + Firefox/Mozilla PC/Mac + Opera 7.23 + PC + Safari 2 + + Known to degrade gracefully on: + IE5.0 PC + + Note: IE5.0 fails due to the use of lookahead in some stylesets. To avoid script errors + in older browsers use expressions that use lookahead in string format when defining stylesets. + + This script is inspired by star-light by entirely cunning Dean Edwards + http://dean.edwards.name/star-light/. +*/ + +// replace callback support for safari. +if ("a".replace(/a/, function() {return "b"}) != "b") (function(){ + var default_replace = String.prototype.replace; + String.prototype.replace = function(search,replace){ + // replace is not function + if(typeof replace != "function"){ + return default_replace.apply(this,arguments) + } + var str = "" + this; + var callback = replace; + // search string is not RegExp + if(!(search instanceof RegExp)){ + var idx = str.indexOf(search); + return ( + idx == -1 ? str : + default_replace.apply(str,[search,callback(search, idx, str)]) + ) + } + var reg = search; + var result = []; + var lastidx = reg.lastIndex; + var re; + while((re = reg.exec(str)) != null){ + var idx = re.index; + var args = re.concat(idx, str); + result.push( + str.slice(lastidx,idx), + callback.apply(null,args).toString() + ); + if(!reg.global){ + lastidx += RegExp.lastMatch.length; + break + }else{ + lastidx = reg.lastIndex; + } + } + result.push(str.slice(lastidx)); + return result.join("") + } +})(); + +var CodeHighlighter = { styleSets : new Array }; + +CodeHighlighter.addStyle = function(name, rules) { + // using push test to disallow older browsers from adding styleSets + if ([].push) this.styleSets.push({ + name : name, + rules : rules, + ignoreCase : arguments[2] || false + }) + + function setEvent() { + // set highlighter to run on load (use LowPro if present) + if (typeof Event != 'undefined' && typeof Event.onReady == 'function') + return Event.onReady(CodeHighlighter.init.bind(CodeHighlighter)); + + var old = window.onload; + + if (typeof window.onload != 'function') { + window.onload = function() { CodeHighlighter.init() }; + } else { + window.onload = function() { + old(); + CodeHighlighter.init(); + } + } + } + + // only set the event when the first style is added + if (this.styleSets.length==1) setEvent(); +} + +CodeHighlighter.init = function() { + if (!document.getElementsByTagName) return; + if ("a".replace(/a/, function() {return "b"}) != "b") return; // throw out Safari versions that don't support replace function + // throw out older browsers + + var codeEls = document.getElementsByTagName("CODE"); + // collect array of all pre elements + 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() { + // joins regexes into one big parallel regex + var exps = new Array; + for (var i = 0; i < this.length; i++) exps.push(this[i].exp); + return exps.join("|"); + } + + function addRule(className, rule) { + // add a replace rule + var exp = (typeof rule.exp != "string")?String(rule.exp).substr(1, String(rule.exp).length-2):rule.exp; + // converts regex rules to strings and chops of the slashes + rules.push({ + className : className, + exp : "(" + exp + ")", + length : (exp.match(/(^|[^\\])\([^?]/g) || "").length + 1, // number of subexps in rule + replacement : rule.replacement || null + }); + } + + function parse(text, ignoreCase) { + // main text parsing and replacement + return text.replace(new RegExp(rules, (ignoreCase)?"gi":"g"), function() { + var i = 0, j = 1, rule; + while (rule = rules[i++]) { + if (arguments[j]) { + // if no custom replacement defined do the simple replacement + if (!rule.replacement) return "<span class=\"" + rule.className + "\">" + arguments[0] + "</span>"; + else { + // replace $0 with the className then do normal replaces + 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) { + // clear rules array + var parsed, clsRx = new RegExp("(\\s|^)" + styleSet.name + "(\\s|$)"); + rules.length = 0; + + // get stylable elements by filtering out all code elements without the correct className + var stylableEls = codeEls.filter(function(item) { return clsRx.test(item.className) }); + + // add style rules to parser + for (var className in styleSet.rules) addRule(className, styleSet.rules[className]); + + + // replace for all elements + for (var i = 0; i < stylableEls.length; i++) { + // EVIL hack to fix IE whitespace badness if it's inside a <pre> + 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(/\n( *)/g, function() { + var spaces = ""; + for (var i = 0; i < arguments[1].length; i++) spaces+= " "; + return "\n" + spaces; + }); + parsed = parsed.replace(/\t/g, " "); + parsed = parsed.replace(/\n(<\/\w+>)?/g, "<br />$1").replace(/<br \/>[\n\r\s]*<br \/>/g, "<p><br></p>"); + + } else parsed = parse(stylableEls[i].innerHTML, styleSet.ignoreCase); + + stylableEls[i].innerHTML = parsed; + } + } + + // run highlighter on all stylesets + for (var i=0; i < this.styleSets.length; i++) { + highlightCode(this.styleSets[i]); + } +}
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