aaac7fed
 liuqimichale
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var parse = require('./parser');
var compress = require('./compressor');
var translate = require('./utils/translate');
var translateWithSourceMap = require('./utils/translateWithSourceMap');
var walkers = require('./utils/walk');
var clone = require('./utils/clone');
var List = require('./utils/list');
function debugOutput(name, options, startTime, data) {
if (options.debug) {
console.error('## ' + name + ' done in %d ms\n', Date.now() - startTime);
}
return data;
}
function createDefaultLogger(level) {
var lastDebug;
return function logger(title, ast) {
var line = title;
if (ast) {
line = '[' + ((Date.now() - lastDebug) / 1000).toFixed(3) + 's] ' + line;
}
if (level > 1 && ast) {
var css = translate(ast, true);
// when level 2, limit css to 256 symbols
if (level === 2 && css.length > 256) {
css = css.substr(0, 256) + '...';
}
line += '\n ' + css + '\n';
}
console.error(line);
lastDebug = Date.now();
};
}
function copy(obj) {
var result = {};
for (var key in obj) {
result[key] = obj[key];
}
return result;
}
function buildCompressOptions(options) {
options = copy(options);
if (typeof options.logger !== 'function' && options.debug) {
options.logger = createDefaultLogger(options.debug);
}
return options;
}
function runHandler(ast, options, handlers) {
if (!Array.isArray(handlers)) {
handlers = [handlers];
}
handlers.forEach(function(fn) {
fn(ast, options);
});
}
function minify(context, source, options) {
options = options || {};
var filename = options.filename || '<unknown>';
var result;
// parse
var ast = debugOutput('parsing', options, Date.now(),
parse(source, {
context: context,
filename: filename,
positions: Boolean(options.sourceMap)
})
);
// before compress handlers
if (options.beforeCompress) {
debugOutput('beforeCompress', options, Date.now(),
runHandler(ast, options, options.beforeCompress)
);
}
// compress
var compressResult = debugOutput('compress', options, Date.now(),
compress(ast, buildCompressOptions(options))
);
// after compress handlers
if (options.afterCompress) {
debugOutput('afterCompress', options, Date.now(),
runHandler(compressResult, options, options.afterCompress)
);
}
// translate
if (options.sourceMap) {
result = debugOutput('translateWithSourceMap', options, Date.now(), (function() {
var tmp = translateWithSourceMap(compressResult.ast);
tmp.map._file = filename; // since other tools can relay on file in source map transform chain
tmp.map.setSourceContent(filename, source);
return tmp;
})());
} else {
result = debugOutput('translate', options, Date.now(), {
css: translate(compressResult.ast),
map: null
});
}
return result;
}
function minifyStylesheet(source, options) {
return minify('stylesheet', source, options);
};
function minifyBlock(source, options) {
return minify('block', source, options);
}
module.exports = {
version: require('../package.json').version,
// classes
List: List,
// main methods
minify: minifyStylesheet,
minifyBlock: minifyBlock,
// step by step
parse: parse,
compress: compress,
translate: translate,
translateWithSourceMap: translateWithSourceMap,
// walkers
walk: walkers.all,
walkRules: walkers.rules,
walkRulesRight: walkers.rulesRight,
// utils
clone: clone
};
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