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142 lines
3.4 KiB
142 lines
3.4 KiB
var csstree = require('css-tree');
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var parse = csstree.parse;
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var compress = require('./compress');
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var generate = csstree.generate;
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function debugOutput(name, options, startTime, data) {
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if (options.debug) {
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console.error('## ' + name + ' done in %d ms\n', Date.now() - startTime);
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}
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return data;
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}
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function createDefaultLogger(level) {
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var lastDebug;
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return function logger(title, ast) {
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var line = title;
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if (ast) {
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line = '[' + ((Date.now() - lastDebug) / 1000).toFixed(3) + 's] ' + line;
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}
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if (level > 1 && ast) {
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var css = generate(ast);
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// when level 2, limit css to 256 symbols
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if (level === 2 && css.length > 256) {
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css = css.substr(0, 256) + '...';
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}
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line += '\n ' + css + '\n';
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}
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console.error(line);
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lastDebug = Date.now();
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};
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}
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function copy(obj) {
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var result = {};
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for (var key in obj) {
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result[key] = obj[key];
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}
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return result;
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}
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function buildCompressOptions(options) {
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options = copy(options);
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if (typeof options.logger !== 'function' && options.debug) {
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options.logger = createDefaultLogger(options.debug);
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}
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return options;
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}
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function runHandler(ast, options, handlers) {
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if (!Array.isArray(handlers)) {
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handlers = [handlers];
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}
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handlers.forEach(function(fn) {
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fn(ast, options);
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});
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}
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function minify(context, source, options) {
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options = options || {};
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var filename = options.filename || '<unknown>';
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var result;
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// parse
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var ast = debugOutput('parsing', options, Date.now(),
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parse(source, {
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context: context,
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filename: filename,
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positions: Boolean(options.sourceMap)
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})
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);
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// before compress handlers
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if (options.beforeCompress) {
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debugOutput('beforeCompress', options, Date.now(),
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runHandler(ast, options, options.beforeCompress)
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);
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}
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// compress
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var compressResult = debugOutput('compress', options, Date.now(),
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compress(ast, buildCompressOptions(options))
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);
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// after compress handlers
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if (options.afterCompress) {
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debugOutput('afterCompress', options, Date.now(),
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runHandler(compressResult, options, options.afterCompress)
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);
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}
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// generate
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if (options.sourceMap) {
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result = debugOutput('generate(sourceMap: true)', options, Date.now(), (function() {
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var tmp = generate(compressResult.ast, { sourceMap: true });
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tmp.map._file = filename; // since other tools can relay on file in source map transform chain
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tmp.map.setSourceContent(filename, source);
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return tmp;
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}()));
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} else {
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result = debugOutput('generate', options, Date.now(), {
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css: generate(compressResult.ast),
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map: null
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});
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}
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return result;
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}
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function minifyStylesheet(source, options) {
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return minify('stylesheet', source, options);
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}
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function minifyBlock(source, options) {
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return minify('declarationList', source, options);
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}
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module.exports = {
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version: require('../package.json').version,
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// main methods
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minify: minifyStylesheet,
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minifyBlock: minifyBlock,
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// css syntax parser/walkers/generator/etc
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syntax: Object.assign({
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compress: compress
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}, csstree)
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};
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