var csstree = require('css-tree'); var parse = csstree.parse; var compress = require('./compress'); var generate = csstree.generate; 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 = generate(ast); // 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 || ''; 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) ); } // generate if (options.sourceMap) { result = debugOutput('generate(sourceMap: true)', options, Date.now(), (function() { var tmp = generate(compressResult.ast, { sourceMap: true }); 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('generate', options, Date.now(), { css: generate(compressResult.ast), map: null }); } return result; } function minifyStylesheet(source, options) { return minify('stylesheet', source, options); } function minifyBlock(source, options) { return minify('declarationList', source, options); } module.exports = { version: require('../package.json').version, // main methods minify: minifyStylesheet, minifyBlock: minifyBlock, // compress an AST compress: compress, // css syntax parser/walkers/generator/etc syntax: csstree };