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"use strict";
Object.defineProperty(exports, "__esModule", {
value: true
});
exports.default = minifyCss;
var _helpers = require("../helpers");
const cssnano = (0, _helpers.optionalRequire)('cssnano');
const postcss = (0, _helpers.optionalRequire)('postcss');
const postcssOptions = {
// Prevent the following warning from being shown:
// > Without `from` option PostCSS could generate wrong source map and will not find Browserslist config.
// > Set it to CSS file path or to `undefined` to prevent this warning.
from: undefined
};
/** Minify CSS with cssnano */
function minifyCss(tree, options, cssnanoOptions) {
if (!cssnano || !postcss) {
return tree;
}
let promises = [];
tree.walk(node => {
if ((0, _helpers.isStyleNode)(node)) {
promises.push(processStyleNode(node, cssnanoOptions));
} else if (node.attrs && node.attrs.style) {
promises.push(processStyleAttr(node, cssnanoOptions));
}
return node;
});
return Promise.all(promises).then(() => tree);
}
function processStyleNode(styleNode, cssnanoOptions) {
let css = (0, _helpers.extractCssFromStyleNode)(styleNode); // Improve performance by avoiding calling stripCdata again and again
let isCdataWrapped = false;
if (css.includes('CDATA')) {
const strippedCss = stripCdata(css);
isCdataWrapped = css !== strippedCss;
css = strippedCss;
}
return postcss([cssnano(cssnanoOptions)]).process(css, postcssOptions).then(result => {
if (isCdataWrapped) {
return styleNode.content = ['<![CDATA[' + result + ']]>'];
}
return styleNode.content = [result.css];
});
}
function processStyleAttr(node, cssnanoOptions) {
// CSS "color: red;" is invalid. Therefore it should be wrapped inside some selector:
// a{color: red;}
const wrapperStart = 'a{';
const wrapperEnd = '}';
const wrappedStyle = wrapperStart + (node.attrs.style || '') + wrapperEnd;
return postcss([cssnano(cssnanoOptions)]).process(wrappedStyle, postcssOptions).then(result => {
const minifiedCss = result.css; // Remove wrapperStart at the start and wrapperEnd at the end of minifiedCss
node.attrs.style = minifiedCss.substring(wrapperStart.length, minifiedCss.length - wrapperEnd.length);
});
}
function stripCdata(css) {
const leftStrippedCss = css.replace('<![CDATA[', '');
if (leftStrippedCss === css) {
return css;
}
const strippedCss = leftStrippedCss.replace(']]>', '');
return leftStrippedCss === strippedCss ? css : strippedCss;
}