84 lines
1.8 KiB
JavaScript
84 lines
1.8 KiB
JavaScript
'use strict';
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const { list } = require('postcss');
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const { isWidth, isStyle, isColor } = require('./validateWsc.js');
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const none = /^\s*(none|medium)(\s+none(\s+(none|currentcolor))?)?\s*$/i;
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/* Approximate https://drafts.csswg.org/css-values-4/#typedef-dashed-ident */
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// eslint-disable-next-line no-control-regex
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const varRE = /--(\w|-|[^\x00-\x7F])+/g;
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/** @type {(v: string) => string} */
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const toLower = (v) => {
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let match;
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let lastIndex = 0;
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let result = '';
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varRE.lastIndex = 0;
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while ((match = varRE.exec(v)) !== null) {
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if (match.index > lastIndex) {
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result += v.substring(lastIndex, match.index).toLowerCase();
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}
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result += match[0];
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lastIndex = match.index + match[0].length;
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}
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if (lastIndex < v.length) {
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result += v.substring(lastIndex).toLowerCase();
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}
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if (result === '') {
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return v;
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}
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return result;
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};
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/**
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* @param {string} value
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* @return {[string, string, string]}
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*/
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module.exports = function parseWsc(value) {
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if (none.test(value)) {
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return ['medium', 'none', 'currentcolor'];
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}
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let width, style, color;
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const values = list.space(value);
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if (
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values.length > 1 &&
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isStyle(values[1]) &&
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values[0].toLowerCase() === 'none'
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) {
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values.unshift();
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width = '0';
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}
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/** @type {string[]} */
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const unknown = [];
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values.forEach((v) => {
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if (isStyle(v)) {
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style = toLower(v);
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} else if (isWidth(v)) {
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width = toLower(v);
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} else if (isColor(v)) {
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color = toLower(v);
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} else {
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unknown.push(v);
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}
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});
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if (unknown.length) {
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if (!width && style && color) {
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width = unknown.pop();
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}
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if (width && !style && color) {
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style = unknown.pop();
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}
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if (width && style && !color) {
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color = unknown.pop();
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}
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}
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return /** @type {[string, string, string]} */ ([width, style, color]);
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};
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