index.js•3.22 kB
import { version } from './version.js';
import * as syntax from './syntax.js';
import * as utils from './utils.js';
const { parse, generate, compress } = syntax;
function debugOutput(name, options, startTime, data) {
if (options.debug) {
console.error(`## ${name} done in %d ms\n`, Date.now() - startTime);
}
return data;
}
function createDefaultLogger(level) {
let lastDebug;
return function logger(title, ast) {
let line = title;
if (ast) {
line = `[${((Date.now() - lastDebug) / 1000).toFixed(3)}s] ${line}`;
}
if (level > 1 && ast) {
let 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 buildCompressOptions(options) {
options = { ...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(fn => fn(ast, options));
}
function minify(context, source, options) {
options = options || {};
const filename = options.filename || '<unknown>';
let result;
// parse
const ast = debugOutput('parsing', options, Date.now(),
parse(source, {
context,
filename,
positions: Boolean(options.sourceMap)
})
);
// before compress handlers
if (options.beforeCompress) {
debugOutput('beforeCompress', options, Date.now(),
runHandler(ast, options, options.beforeCompress)
);
}
// compress
const 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(), (() => {
const 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);
}
export {
version,
utils,
// main methods
minifyStylesheet as minify,
minifyBlock,
// css syntax parser/walkers/generator/etc
syntax
};