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145 lines
3.8 KiB
Text
145 lines
3.8 KiB
Text
import { shorthandData } from './shorthand-data.mjs';
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const builtInOrders = [
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'alphabetical',
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'concentric-css',
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'smacss',
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];
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export const cssDeclarationSorter = ({ order = 'alphabetical', keepOverrides = false } = {}) => ({
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postcssPlugin: 'css-declaration-sorter',
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OnceExit (css) {
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let withKeepOverrides = comparator => comparator;
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if (keepOverrides) {
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withKeepOverrides = withOverridesComparator(shorthandData);
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}
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if (typeof order === 'function') {
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return processCss({ css, comparator: withKeepOverrides(order) });
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}
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if (!builtInOrders.includes(order))
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return Promise.reject(
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Error([
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`Invalid built-in order '${order}' provided.`,
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`Available built-in orders are: ${builtInOrders}`,
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].join('\n'))
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);
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return import(`../orders/${order}.mjs`)
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.then(({ properties }) => processCss({
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css,
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comparator: withKeepOverrides(orderComparator(properties)),
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}));
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},
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});
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cssDeclarationSorter.postcss = true;
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// Kept for backward compatibility
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export default cssDeclarationSorter;
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function processCss ({ css, comparator }) {
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const comments = [];
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const rulesCache = [];
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css.walk(node => {
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const nodes = node.nodes;
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const type = node.type;
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if (type === 'comment') {
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// Don't do anything to root comments or the last newline comment
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const isNewlineNode = node.raws.before && node.raws.before.includes('\n');
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const lastNewlineNode = isNewlineNode && !node.next();
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const onlyNode = !node.prev() && !node.next() || !node.parent;
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if (lastNewlineNode || onlyNode || node.parent.type === 'root') {
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return;
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}
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if (isNewlineNode) {
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const pairedNode = node.next() || node.prev();
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if (pairedNode) {
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comments.unshift({
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'comment': node,
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'pairedNode': pairedNode,
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'insertPosition': node.next() ? 'Before' : 'After',
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});
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node.remove();
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}
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} else {
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const pairedNode = node.prev() || node.next();
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if (pairedNode) {
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comments.push({
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'comment': node,
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'pairedNode': pairedNode,
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'insertPosition': 'After',
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});
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node.remove();
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}
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}
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return;
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}
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// Add rule-like nodes to a cache so that we can remove all
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// comment nodes before we start sorting.
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const isRule = type === 'rule' || type === 'atrule';
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if (isRule && nodes && nodes.length > 1) {
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rulesCache.push(nodes);
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}
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});
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// Perform a sort once all comment nodes are removed
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rulesCache.forEach(nodes => {
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sortCssDeclarations({ nodes, comparator });
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});
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// Add comments back to the nodes they are paired with
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comments.forEach(node => {
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const pairedNode = node.pairedNode;
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node.comment.remove();
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pairedNode.parent && pairedNode.parent['insert' + node.insertPosition](pairedNode, node.comment);
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});
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}
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function sortCssDeclarations ({ nodes, comparator }) {
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nodes.sort((a, b) => {
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if (a.type === 'decl' && b.type === 'decl') {
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return comparator(a.prop, b.prop);
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} else {
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return compareDifferentType(a, b);
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}
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});
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}
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function withOverridesComparator (shorthandData) {
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return function (comparator) {
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return function (a, b) {
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a = removeVendorPrefix(a);
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b = removeVendorPrefix(b);
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if (shorthandData[a] && shorthandData[a].includes(b)) return 0;
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if (shorthandData[b] && shorthandData[b].includes(a)) return 0;
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return comparator(a, b);
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};
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};
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}
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function orderComparator (order) {
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return function (a, b) {
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return order.indexOf(a) - order.indexOf(b);
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};
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}
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function compareDifferentType (a, b) {
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if (b.type === 'atrule') {
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return 0;
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}
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return a.type === 'decl' ? -1 : b.type === 'decl' ? 1 : 0;
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}
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function removeVendorPrefix (property) {
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return property.replace(/^-\w+-/, '');
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}
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