forked from mystiq/hydrogen-web
96 lines
3.1 KiB
JavaScript
96 lines
3.1 KiB
JavaScript
/*
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Copyright 2021 The Matrix.org Foundation C.I.C.
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Licensed under the Apache License, Version 2.0 (the "License");
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you may not use this file except in compliance with the License.
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You may obtain a copy of the License at
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http://www.apache.org/licenses/LICENSE-2.0
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Unless required by applicable law or agreed to in writing, software
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distributed under the License is distributed on an "AS IS" BASIS,
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WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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See the License for the specific language governing permissions and
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limitations under the License.
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*/
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const valueParser = require("postcss-value-parser");
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/**
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* This plugin extracts content inside url() into css variables and adds the variables to the root section.
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* This plugin is used in conjunction with css-url-processor plugin to colorize svg icons.
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*/
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const idToPrepend = "icon-url";
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function findAndReplaceUrl(decl, urlVariables, counter) {
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const value = decl.value;
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let parsed;
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try {
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parsed = valueParser(value);
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} catch (err) {
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console.log(`Error trying to parse ${decl}`);
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throw err;
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}
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parsed.walk(node => {
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if (node.type !== "function" || node.value !== "url") {
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return;
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}
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const url = node.nodes[0].value;
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if (!url.match(/\.svg\?primary=.+/)) {
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return;
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}
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const count = counter.next().value;
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const variableName = `${idToPrepend}-${count}`;
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urlVariables.set(variableName, url);
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node.value = "var";
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node.nodes = [{ type: "word", value: `--${variableName}` }];
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});
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decl.assign({prop: decl.prop, value: parsed.toString()})
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}
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function addResolvedVariablesToRootSelector(root, { Rule, Declaration }, urlVariables) {
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const newRule = new Rule({ selector: ":root", source: root.source });
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// Add derived css variables to :root
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urlVariables.forEach((value, key) => {
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const declaration = new Declaration({ prop: `--${key}`, value: `url("${value}")`});
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newRule.append(declaration);
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});
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root.append(newRule);
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}
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function populateMapWithIcons(map, cssFileLocation, urlVariables) {
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const location = cssFileLocation.match(/(.+)\/.+\.css/)?.[1];
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const sharedObject = map.get(location);
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sharedObject["icon"] = Object.fromEntries(urlVariables);
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}
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function *createCounter() {
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for (let i = 0; ; ++i) {
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yield i;
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}
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}
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/* *
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* @type {import('postcss').PluginCreator}
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*/
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module.exports = (opts = {}) => {
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return {
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postcssPlugin: "postcss-url-to-variable",
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Once(root, { Rule, Declaration }) {
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const urlVariables = new Map();
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const counter = createCounter();
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root.walkDecls(decl => findAndReplaceUrl(decl, urlVariables, counter));
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if (urlVariables.size) {
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addResolvedVariablesToRootSelector(root, { Rule, Declaration }, urlVariables);
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}
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if (opts.compiledVariables){
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const cssFileLocation = root.source.input.from;
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populateMapWithIcons(opts.compiledVariables, cssFileLocation, urlVariables);
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}
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},
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};
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};
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module.exports.postcss = true;
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