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This commit is contained in:
RMidhunSuresh 2022-03-24 16:36:01 +05:30
parent 3ae2b4dab4
commit cbff912476
1 changed files with 26 additions and 9 deletions
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35
scripts/postcss/css-url-to-variables.js
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@ -1,7 +1,23 @@
/*
Copyright 2021 The Matrix.org Foundation C.I.C.
Licensed under the Apache License, Version 2.0 (the "License");
you may not use this file except in compliance with the License.
You may obtain a copy of the License at
http://www.apache.org/licenses/LICENSE-2.0
Unless required by applicable law or agreed to in writing, software
distributed under the License is distributed on an "AS IS" BASIS,
WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
See the License for the specific language governing permissions and
limitations under the License.
*/
const valueParser = require("postcss-value-parser"); const valueParser = require("postcss-value-parser");
let counter = 0; let counter;
const variableMap = new Map(); const urlVariables = new Map();
const format = "icon-url" const idToPrepend = "icon-url";
function extractUrl(decl) { function extractUrl(decl) {
const value = decl.value; const value = decl.value;
@ -12,14 +28,14 @@ function extractUrl(decl) {
return; return;
} }
const urlStringNode = node.nodes[0]; const urlStringNode = node.nodes[0];
const variableName = `--${format}-${counter++}`; const variableName = `${idToPrepend}-${counter++}`;
variableMap.set(variableName, `"${urlStringNode.value}"`); urlVariables.set(variableName, `"${urlStringNode.value}"`);
const varNode = { const varNode = {
type: "function", type: "function",
value: "var", value: "var",
nodes: [{ type: "word", value: variableName }], nodes: [{ type: "word", value: `--${variableName}` }],
}; };
//replace the url-string node with this var-node // replace the url-string node with this var-node
node.nodes[0] = varNode; node.nodes[0] = varNode;
}); });
decl.assign({prop: decl.prop, value: parsed.toString()}) decl.assign({prop: decl.prop, value: parsed.toString()})
@ -29,8 +45,8 @@ function extractUrl(decl) {
function addResolvedVariablesToRootSelector(root, { Rule, Declaration }) { function addResolvedVariablesToRootSelector(root, { Rule, Declaration }) {
const newRule = new Rule({ selector: ":root", source: root.source }); const newRule = new Rule({ selector: ":root", source: root.source });
// Add derived css variables to :root // Add derived css variables to :root
variableMap.forEach((value, key) => { urlVariables.forEach((value, key) => {
const declaration = new Declaration({ prop: key, value }); const declaration = new Declaration({ prop: `--${key}`, value });
newRule.append(declaration); newRule.append(declaration);
}); });
root.append(newRule); root.append(newRule);
@ -40,6 +56,7 @@ function addResolvedVariablesToRootSelector(root, { Rule, Declaration }) {
* @type {import('postcss').PluginCreator} * @type {import('postcss').PluginCreator}
*/ */
module.exports = (opts = {}) => { module.exports = (opts = {}) => {
counter = 0;
return { return {
postcssPlugin: "postcss-url-to-variable", postcssPlugin: "postcss-url-to-variable",