131 lines
3.1 KiB
JavaScript
131 lines
3.1 KiB
JavaScript
import { version } from './version.js';
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import * as syntax from './syntax.js';
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import * as utils from './utils.js';
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const { parse, generate, compress } = syntax;
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function debugOutput(name, options, startTime, data) {
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if (options.debug) {
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console.error(`## ${name} done in %d ms\n`, Date.now() - startTime);
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}
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return data;
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}
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function createDefaultLogger(level) {
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let lastDebug;
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return function logger(title, ast) {
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let line = title;
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if (ast) {
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line = `[${((Date.now() - lastDebug) / 1000).toFixed(3)}s] ${line}`;
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}
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if (level > 1 && ast) {
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let 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 buildCompressOptions(options) {
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options = { ...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(fn => fn(ast, options));
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}
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function minify(context, source, options) {
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options = options || {};
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const filename = options.filename || '<unknown>';
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let result;
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// parse
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const ast = debugOutput('parsing', options, Date.now(),
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parse(source, {
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context,
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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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const 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(), (() => {
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const 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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export {
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version,
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utils,
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// main methods
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minifyStylesheet as minify,
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minifyBlock,
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// css syntax parser/walkers/generator/etc
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syntax
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};
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