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Remove DRY modifications for smaller gzip size.

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Former-commit-id: 69391d792d76c6592e7d48aec44165a8db388f81
This commit is contained in:
John-David Dalton
2012-09-22 20:50:59 -07:00
parent e4eb5dadda
commit 8492c13e72
1 changed files with 33 additions and 90 deletions
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123
build.js
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@@ -395,16 +395,27 @@
}
/**
* Gets the `_.isArguments` fallback snippet from `source`.
* Gets the `_.isArguments` fallback from `source`.
*
* @private
* @param {String} source The source to inspect.
* @returns {String} Returns the `isArguments` fallback snippet.
* @returns {String} Returns the `isArguments` fallback.
*/
function getIsArgumentsFallback(source) {
return (source.match(/(?:\s*\/\/.*)*\n( +)if *\(noArgsClass\)[\s\S]+?};\n\1}/) || [''])[0];
}
/**
* Gets the `_.isFunction` fallback from `source`.
*
* @private
* @param {String} source The source to inspect.
* @returns {String} Returns the `isFunction` fallback.
*/
function getIsFunctionFallback(source) {
return (source.match(/(?:\s*\/\/.*)*\n( +)if *\(isFunction\(\/x\/[\s\S]+?};\n\1}/) || [''])[0];
}
/**
* Gets the names of methods in `source` belonging to the given `category`.
*
@@ -579,7 +590,7 @@
* @returns {String} Returns the source with the `isFunction` fallback removed.
*/
function removeIsFunctionFallback(source) {
return source.replace(/(?:\s*\/\/.*)*\n( +)if *\(isFunction\(\/x\/[\s\S]+?};\n\1}/, '');
return source.replace(getIsFunctionFallback(source), '');
}
/**
@@ -785,6 +796,11 @@
// backup `dependencyMap` to restore later
var dependencyBackup = _.clone(dependencyMap, true);
// used to specify a custom IIFE to wrap Lo-Dash
var iife = options.reduce(function(result, value) {
return result || (result = value.match(/iife=(.*)/)) && result[1];
}, null);
// flag used to specify a Backbone build
var isBackbone = options.indexOf('backbone') > -1;
@@ -810,23 +826,24 @@
// constructed using the "use strict" directive
var isStrict = options.indexOf('strict') > -1;
// flag used to specify if the build should include the "use strict" directive
var useStrict = isStrict || !(isLegacy || isMobile);
// used to specify the ways to export the `LoDash` function
var exportsOptions = options.reduce(function(result, value) {
return /exports/.test(value) ? optionToArray(value).sort() : result;
}, isUnderscore
? ['commonjs', 'global', 'node']
: exportsAll.slice()
);
// used to specify the output path for builds
var outputPath = options.reduce(function(result, value, index) {
return result || (/^(?:-o|--output)$/.test(value) ? options[index + 1] : result);
}, '');
// the lodash.js source
var source = fs.readFileSync(path.join(__dirname, 'lodash.js'), 'utf8');
// used to specify the ways to export the `LoDash` function
var exportsOptions = options.reduce(function(result, value) {
return /exports/.test(value)
? optionToArray(value).sort()
: result;
}, exportsAll.slice());
// used to specify a custom IIFE to wrap Lo-Dash
var iife = options.reduce(function(result, value) {
return result || (result = value.match(/iife=(.*)/)) && result[1];
}, null);
// flag used to specify if the build should include the "use strict" directive
var useStrict = isStrict || !(isLegacy || isMobile);
/*------------------------------------------------------------------------*/
@@ -985,75 +1002,6 @@
source = removeIsArgumentsFallback(source);
}
// DRY out isType functions
(function() {
var iteratorName = _.find(['forEach', 'forOwn'], function(methodName) {
return !isRemoved(source, methodName);
});
// skip this optimization if there are no iteration methods to use
if (!iteratorName) {
return;
}
var funcNames = [],
objectSnippets = [];
// build replacement code
_.forOwn({
'Arguments': 'argsClass',
'Date': 'dateClass',
'Number': 'numberClass',
'RegExp': 'regexpClass',
'String': 'stringClass'
},
function(value, key) {
var funcName = 'is' + key,
funcCode = matchFunction(source, funcName);
// only DRY `isArguments` for Underscore builds
if (key == 'Arguments' && !isUnderscore) {
return;
}
if (funcCode) {
funcNames.push(funcName);
objectSnippets.push("'" + key + "': " + value);
}
});
// skip this optimization if there are less than 2 isType functions
if (funcNames.length < 2) {
return;
}
// remove existing isType functions
funcNames.forEach(function(funcName) {
source = removeFunction(source, funcName);
});
// insert new DRY code before the `lodash` method assignments
var snippet = getMethodAssignments(source);
source = source.replace(snippet, snippet += [
'',
' // add `_.' + funcNames.join('`, `_.') + '`',
' ' + iteratorName + '({\n ' + objectSnippets.join(',\n ') + '\n }, function(className, key) {',
" lodash['is' + key] = function(value) {",
' return toString.call(value) == className',
' }',
' });'
].join('\n'));
// move `isArguments` fallback to after the new DRY code
if (isUnderscore) {
var fallback = getIsArgumentsFallback(source);
source = removeIsArgumentsFallback(source).replace(snippet,
snippet + fallback
.replace(/\bisArguments\b/g, 'lodash.$&')
.replace(/\bnoArgsClass\b/g, '!lodash.isArguments(arguments)') +
'\n'
);
}
}());
/*------------------------------------------------------------------------*/
if (isLegacy) {
@@ -1316,11 +1264,6 @@
/(?:category|exclude|exports|iife|include|minus|plus)=/.test(options) ||
!_.isEqual(exportsOptions, exportsAll);
// used to specify the output path for builds
var outputPath = options.reduce(function(result, value, index) {
return result || (/^(?:-o|--output)$/.test(value) ? options[index + 1] : result);
}, '');
// used to name temporary files created in `dist/`
var workingName = 'lodash' + (isCustom ? '.custom' : '') + '.min';