93 lines
3.3 KiB
JavaScript
93 lines
3.3 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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const resolve = require("path").resolve;
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function colorsFromURL(url, colorMap) {
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const params = new URL(`file://${url}`).searchParams;
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const primary = params.get("primary");
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if (!primary) {
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return null;
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}
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const secondary = params.get("secondary");
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const primaryColor = colorMap.get(primary);
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const secondaryColor = colorMap.get(secondary);
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if (!primaryColor) {
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throw new Error(`Variable ${primary} not found in resolved color variables!`);
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}
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if (secondary && !secondaryColor) {
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throw new Error(`Variable ${secondary} not found in resolved color variables!`);
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}
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return [primaryColor, secondaryColor];
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}
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function processURL(decl, replacer, colorMap, cssPath) {
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const value = decl.value;
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const parsed = valueParser(value);
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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 urlStringNode = node.nodes[0];
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const oldURL = urlStringNode.value;
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const oldURLAbsolute = resolve(cssPath, oldURL);
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const colors = colorsFromURL(oldURLAbsolute, colorMap);
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if (!colors) {
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// If no primary color is provided via url params, then this url need not be handled.
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return;
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}
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const newURL = replacer(oldURLAbsolute.replace(/\?.+/, ""), ...colors);
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if (!newURL) {
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throw new Error("Replacer failed to produce a replacement URL!");
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}
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urlStringNode.value = newURL;
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});
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decl.assign({prop: decl.prop, value: parsed.toString()})
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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, {result}) {
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const cssFileLocation = root.source.input.from;
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if (cssFileLocation.includes("type=runtime")) {
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// If this is a runtime theme, don't process urls.
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return;
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}
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/*
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postcss-compile-variables should have sent the list of resolved colours down via results
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*/
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const {colorMap} = result.messages.find(m => m.type === "resolved-variable-map");
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if (!colorMap) {
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throw new Error("Postcss results do not contain resolved colors!");
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}
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/*
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Go through each declaration and if it contains an URL, replace the url with the result
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of running replacer(url)
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*/
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const cssPath = root.source?.input.file.replace(/[^/]*$/, "");
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root.walkDecls(decl => processURL(decl, opts.replacer, colorMap, cssPath));
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},
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};
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};
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module.exports.postcss = true;
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