Implement plugin

This commit is contained in:
RMidhunSuresh 2022-03-25 13:35:21 +05:30
parent 4ded893880
commit 5d5eb93baa
3 changed files with 125 additions and 1 deletions

1
.gitignore vendored
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lib
*.tar.gz
.eslintcache
.tmp

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/*
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 resolve = require("path").resolve;
function colorsFromURL(url, colorVariables) {
const params = new URL(`file://${url}`).searchParams;
const primary = params.get("primary");
if (!primary) {
return null;
}
const secondary = params.get("secondary");
const primaryColor = colorVariables[primary];
const secondaryColor = colorVariables[secondary];
if (!primaryColor) {
throw new Error(`Variable ${primary} not found in resolved color variables!`);
}
if (!secondaryColor) {
throw new Error(`Variable ${secondary} not found in resolved color variables!`);
}
return [primaryColor, secondaryColor];
}
function processURL(decl, replacer, colorVariables) {
const value = decl.value;
const parsed = valueParser(value);
parsed.walk(async node => {
if (node.type !== "function" || node.value !== "url") {
return;
}
const urlStringNode = node.nodes[0];
const oldURL = urlStringNode.value;
const cssPath = decl.source?.input.file.replace(/[^/]*$/, "");
const oldURLAbsolute = resolve(cssPath, oldURL);
const colors = colorsFromURL(oldURLAbsolute, colorVariables);
if (!colors) {
// If no primary color is provided via url params, then this url need not be handled.
return;
}
const newURL = replacer(oldURLAbsolute.replace(/\?.+/, ""), ...colors);
if (!newURL) {
throw new Error("Replacer failed to produce a replacement URL!");
}
urlStringNode.value = newURL;
});
decl.assign({prop: decl.prop, value: parsed.toString()})
}
/* *
* @type {import('postcss').PluginCreator}
*/
module.exports = (opts = {}) => {
return {
postcssPlugin: "postcss-url-to-variable",
Once(root) {
/*
Go through each declaration and if it contains an URL, replace the url with the result
of running replacer(url)
*/
root.walkDecls(decl => processURL(decl, opts.replacer, opts.colors));
},
};
};
module.exports.postcss = true;

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/*
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 fs = require("fs");
const path = require("path");
/**
* Builds a new svg with the colors replaced and returns its location.
* @param {string} svgLocation The location of the input svg file
* @param {string} primaryColor Primary color for the new svg
* @param {string} secondaryColor Secondary color for the new svg
*/
module.exports.buildColorizedSVG = function (svgLocation, primaryColor, secondaryColor) {
const svgCode = fs.readFileSync(svgLocation, { encoding: "utf-8"});
let coloredSVGCode = svgCode.replaceAll("#ff00ff", primaryColor);
coloredSVGCode = coloredSVGCode.replaceAll("#00ffff", secondaryColor);
const fileName = svgLocation.match(/.+\/(.+\.svg)/)[1];
const outputPath = path.resolve(__dirname, "../../.tmp");
try {
fs.mkdirSync(outputPath);
}
catch (e) {
if (e.code !== "EEXIST") {
throw e;
}
}
const outputFile = `${outputPath}/${fileName}`;
fs.writeFileSync(outputFile, coloredSVGCode);
return outputFile;
}