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clean.js
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clean.js
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/**
* Clean-css - https://github.com/jakubpawlowicz/clean-css
* Released under the terms of MIT license
*
* Copyright (C) 2016 JakubPawlowicz.com
*/
var path = require('path');
var url = require('url');
var formatFrom = require('./options/format').formatFrom;
var OptimizationLevel = require('./options/optimization-level').OptimizationLevel;
var optimizationLevelFrom = require('./options/optimization-level').optimizationLevelFrom;
var level0Optimize = require('./optimizer/level-0/optimize');
var level1Optimize = require('./optimizer/level-1/optimize');
var level2Optimize = require('./optimizer/level-2/optimize');
var validator = require('./optimizer/validator');
var inputSourceMapTracker = require('./reader/input-source-map-tracker');
var readSources = require('./reader/read-sources');
var compatibility = require('./utils/compatibility');
var override = require('./utils/override');
var serializeStyles = require('./writer/simple');
var serializeStylesAndSourceMap = require('./writer/source-maps');
var DEFAULT_TIMEOUT = 5000;
var CleanCSS = module.exports = function CleanCSS(options) {
options = options || {};
this.options = {
compatibility: compatibility(options.compatibility),
format: formatFrom(options.format),
inline: inlineOptionsFrom(options.inline),
inlineRequest: options.inlineRequest || {},
inlineTimeout: options.inlineTimeout || DEFAULT_TIMEOUT,
level: optimizationLevelFrom(options.level),
rebase: undefined === options.rebase ? true : !!options.rebase,
rebaseTo: ('rebaseTo' in options) ? path.resolve(options.rebaseTo) : process.cwd(),
sourceMap: !!options.sourceMap,
sourceMapInlineSources: !!options.sourceMapInlineSources
};
this.options.inlineRequest = override(
/* jshint camelcase: false */
proxyOptionsFrom(process.env.HTTP_PROXY || process.env.http_proxy),
this.options.inlineRequest
);
};
function inlineOptionsFrom(rules) {
if (Array.isArray(rules)) {
return rules;
}
return undefined === rules ?
['local'] :
rules.split(',');
}
function proxyOptionsFrom(httpProxy) {
return httpProxy ?
{
hostname: url.parse(httpProxy).hostname,
port: parseInt(url.parse(httpProxy).port)
} :
{};
}
CleanCSS.prototype.minify = function (input, maybeSourceMap, maybeCallback) {
var sourceMap = typeof maybeSourceMap != 'function' ?
maybeSourceMap :
null;
var callback = sourceMap ?
maybeCallback :
maybeSourceMap;
var context = {
stats: {
efficiency: 0,
minifiedSize: 0,
originalSize: 0,
startedAt: Date.now(),
timeSpent: 0
},
cache: {
specificity: {}
},
errors: [],
inlinedStylesheets: [],
inputSourceMapTracker: inputSourceMapTracker(),
localOnly: !callback,
options: this.options,
source: null,
sourcesContent: {},
validator: validator(this.options.compatibility),
warnings: []
};
if (sourceMap) {
context.inputSourceMapTracker.track(undefined, sourceMap);
}
return runner(context.localOnly)(function () {
return readSources(input, context, function (tokens) {
var serialize = context.options.sourceMap ?
serializeStylesAndSourceMap :
serializeStyles;
var optimizedTokens = optimize(tokens, context);
var optimizedStyles = serialize(optimizedTokens, context);
var output = withMetadata(optimizedStyles, context);
return callback ?
callback(context.errors.length > 0 ? context.errors : null, output) :
output;
});
});
};
function runner(localOnly) {
// to always execute code asynchronously when a callback is given
// more at blog.izs.me/post/59142742143/designing-apis-for-asynchrony
return localOnly ?
function (callback) { return callback(); } :
process.nextTick;
}
function optimize(tokens, context) {
var optimized;
optimized = level0Optimize(tokens, context);
optimized = OptimizationLevel.One in context.options.level ?
level1Optimize(tokens, context) :
tokens;
optimized = OptimizationLevel.Two in context.options.level ?
level2Optimize(tokens, context, true) :
optimized;
return optimized;
}
function withMetadata(output, context) {
output.stats = calculateStatsFrom(output.styles, context);
output.errors = context.errors;
output.inlinedStylesheets = context.inlinedStylesheets;
output.warnings = context.warnings;
return output;
}
function calculateStatsFrom(styles, context) {
var finishedAt = Date.now();
var timeSpent = finishedAt - context.stats.startedAt;
delete context.stats.startedAt;
context.stats.timeSpent = timeSpent;
context.stats.efficiency = 1 - styles.length / context.stats.originalSize;
context.stats.minifiedSize = styles.length;
return context.stats;
}