Updated build to packer3
This commit is contained in:
Jörn Zaefferer
parent
5fae496933
commit
0539495e86
5 changed files with 1255 additions and 3 deletions
205
build/js/Packer.js
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205
build/js/Packer.js
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/*
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Packer version 3.0 (beta 5) - copyright 2004-2007, Dean Edwards
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http://www.opensource.org/licenses/mit-license
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*/
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eval(base2.namespace);
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var IGNORE = RegGrp.IGNORE;
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var REMOVE = "";
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var SPACE = " ";
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var WORDS = /\w+/g;
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var Packer = Base.extend({
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minify: function(script) {
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script = script.replace(Packer.CONTINUE, "");
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script = Packer.clean.exec(script);
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script = Packer.whitespace.exec(script);
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script = Packer.clean.exec(script); // seem to grab a few more bytes on the second pass
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return script;
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},
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pack: function(script, base62, shrink) {
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script = this.minify(script);
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if (shrink) script = this._shrinkVariables(script);
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if (base62) script = this._base62Encode(script);
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return script;
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},
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_base62Encode: function(script) {
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var words = new Words(script);
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var encode = function(word) {
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return words.fetch(word).encoded;
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};
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/* build the packed script */
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var p = this._escape(script.replace(WORDS, encode));
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var a = Math.min(Math.max(words.count(), 2), 62);
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var c = words.count();
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var k = words;
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var e = Packer["ENCODE" + (a > 10 ? a > 36 ? 62 : 36 : 10)];
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var r = a > 10 ? "e(c)" : "c";
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// the whole thing
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return format(Packer.UNPACK, p,a,c,k,e,r);
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},
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_escape: function(script) {
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// single quotes wrap the final string so escape them
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// also escape new lines required by conditional comments
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return script.replace(/([\\'])/g, "\\$1").replace(/[\r\n]+/g, "\\n");
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},
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_shrinkVariables: function(script) {
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// Windows Scripting Host cannot do regexp.test() on global regexps.
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var global = function(regexp) {
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// This function creates a global version of the passed regexp.
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return new RegExp(regexp.source, "g");
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};
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var data = []; // encoded strings and regular expressions
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var store = function(string) {
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var replacement = "#" + data.length;
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data.push(string);
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return replacement;
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};
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// Base52 encoding (a-Z)
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var encode52 = function(c) {
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return (c < 52 ? '' : arguments.callee(parseInt(c / 52))) +
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((c = c % 52) > 25 ? String.fromCharCode(c + 39) : String.fromCharCode(c + 97));
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};
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// identify blocks, particularly identify function blocks (which define scope)
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var BLOCK = /(function\s*[\w$]*\s*\(\s*([^\)]*)\s*\)\s*)?(\{([^{}]*)\})/;
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var VAR_ = /var\s+/g;
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var VAR_NAME = /var\s+[\w$]{2,}/g; // > 1 char
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var COMMA = /\s*,\s*/;
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var blocks = []; // store program blocks (anything between braces {})
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// encoder for program blocks
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var encode = function(block, func, args) {
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if (func) { // the block is a function block
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// decode the function block (THIS IS THE IMPORTANT BIT)
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// We are retrieving all sub-blocks and will re-parse them in light
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// of newly shrunk variables
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block = decode(block);
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// create the list of variable and argument names
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var vars = match(block, VAR_NAME).join(",").replace(VAR_, "");
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var ids = Array2.combine(args.split(COMMA).concat(vars.split(COMMA)));
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// process each identifier
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var count = 0, shortId;
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forEach (ids, function(id) {
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id = rescape(trim(id));
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if (id) {
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// find the next free short name (check everything in the current scope)
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do shortId = encode52(count++);
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while (new RegExp("[^\\w$.]" + shortId + "[^\\w$:]").test(block));
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// replace the long name with the short name
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var reg = new RegExp("([^\\w$.])" + id + "([^\\w$:])");
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while (reg.test(block)) block = block.replace(global(reg), "$1" + shortId + "$2");
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var reg = new RegExp("([^{,])" + id + ":", "g");
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block = block.replace(reg, "$1" + shortId + ":");
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}
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});
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}
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var replacement = "~" + blocks.length;
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blocks.push(block);
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return replacement;
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};
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// decoder for program blocks
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var ENCODED = /~(\d+)/;
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var decode = function(script) {
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while (ENCODED.test(script)) {
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script = script.replace(global(ENCODED), function(match, index) {
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return blocks[index];
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});
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}
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return script;
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};
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// encode strings and regular expressions
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script = Packer.data.exec(script, store);
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// remove closures (this is for base2 namespaces only)
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script = script.replace(/new function\(_\)\s*\{/g, "{;#;");
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// encode blocks, as we encode we replace variable and argument names
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while (BLOCK.test(script)) {
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script = script.replace(global(BLOCK), encode);
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}
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// put the blocks back
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script = decode(script);
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// put back the closure (for base2 namespaces only)
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script = script.replace(/\{;#;/g, "new function(_){");
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// put strings and regular expressions back
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script = script.replace(/#(\d+)/g, function(match, index) {
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return data[index];
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});
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return script;
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}
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}, {
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CONTINUE: /\\\r?\n/g,
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ENCODE10: "String",
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ENCODE36: "function(c){return c.toString(a)}",
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ENCODE62: "function(c){return(c<a?'':e(parseInt(c/a)))+((c=c%a)>35?String.fromCharCode(c+29):c.toString(36))}",
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UNPACK: "eval(function(p,a,c,k,e,r){e=%5;if(!''.replace(/^/,String)){while(c--)r[%6]=k[c]" +
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"||%6;k=[function(e){return r[e]}];e=function(){return'\\\\w+'};c=1};while(c--)if(k[c])p=p." +
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"replace(new RegExp('\\\\b'+e(c)+'\\\\b','g'),k[c]);return p}('%1',%2,%3,'%4'.split('|'),0,{}))",
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init: function() {
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this.data = reduce(this.data, new RegGrp, function(data, replacement, expression) {
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data.store(this.javascript.exec(expression), replacement);
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return data;
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}, this);
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this.clean = this.data.union(this.clean);
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this.whitespace = this.data.union(this.whitespace);
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},
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clean: {
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";;;[^\\n]*": REMOVE, // triple semi-colons treated like line comments
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"\\(\\s*;\\s*;\\s*\\)": "(;;)", // for (;;) loops
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"throw[^};]+[};]": IGNORE, // a safari 1.3 bug
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";+\\s*([};])": "$1"
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},
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data: {
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// strings
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"STRING1": IGNORE,
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'STRING2': IGNORE,
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"CONDITIONAL": IGNORE, // conditional comments
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"(COMMENT1)\\n\\s*(REGEXP)?": "\n$2",
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"(COMMENT2)\\s*(REGEXP)?": " $3",
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"COMMENT1$": REMOVE,
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"([\\[(\\^=,{}:;&|!*?])\\s*(REGEXP)": "$1$2"
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},
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javascript: new RegGrp({
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COMMENT1: /\/\/[^\n]*/.source,
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COMMENT2: /\/\*[^*]*\*+([^\/][^*]*\*+)*\//.source,
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CONDITIONAL: /\/\*@|@\*\/|\/\/@[^\n]*\n/.source,
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REGEXP: /\/(\\\/|[^*\/])(\\.|[^\/\n\\])*\//.source,
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STRING1: /'(\\.|[^'\\])*'/.source,
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STRING2: /"(\\.|[^"\\])*"/.source
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}),
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whitespace: {
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"(\\d)\\s+(\\.\\s*[a-z\\$_\\[(])": "$1 $2", // http://dean.edwards.name/weblog/2007/04/packer3/#comment84066
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"([+-])\\s+([+-])": "$1 $2", // c = a++ +b;
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"\\b\\s+\\$\\s+\\b": " $ ", // var $ in
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"\\$\\s+\\b": "$ ", // object$ in
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"\\b\\s+\\$": " $", // return $object
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"\\b\\s+\\b": SPACE,
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"\\s+": REMOVE
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}
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});
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