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Merge pull request #709 from vector-im/compile-variables-improvement

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Theming - postcss-compile-variables improvement
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R Midhun Suresh 2022-04-07 11:31:59 +05:30 committed by GitHub
commit e0bc9b31a9
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GPG key ID: 4AEE18F83AFDEB23
3 changed files with 90 additions and 7 deletions
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4
package.json
View file

@ -43,6 +43,7 @@
"node-html-parser": "^4.0.0",
"postcss-css-variables": "^0.18.0",
"postcss-flexbugs-fixes": "^5.0.2",
"postcss-value-parser": "^4.2.0",
"regenerator-runtime": "^0.13.7",
"text-encoding": "^0.7.0",
"typescript": "^4.3.5",
@ -54,7 +55,6 @@
"another-json": "^0.2.0",
"base64-arraybuffer": "^0.2.0",
"dompurify": "^2.3.0",
"off-color": "^2.0.0",
"postcss-value-parser": "^4.2.0"
"off-color": "^2.0.0"
}
}

46
scripts/postcss/css-compile-variables.js
View file

@ -43,17 +43,32 @@ function parseDeclarationValue(value) {
const parsed = valueParser(value);
const variables = [];
parsed.walk(node => {
if (node.type !== "function" && node.value !== "var") {
if (node.type !== "function") {
return;
}
switch (node.value) {
case "var": {
const variable = node.nodes[0];
variables.push(variable.value);
break;
}
case "url": {
const url = node.nodes[0].value;
// resolve url with some absolute url so that we get the query params without using regex
const params = new URL(url, "file://foo/bar/").searchParams;
const primary = params.get("primary");
const secondary = params.get("secondary");
if (primary) { variables.push(primary); }
if (secondary) { variables.push(secondary); }
break;
}
}
});
return variables;
}
function resolveDerivedVariable(decl, derive) {
const RE_VARIABLE_VALUE = /--((.+)--(.+)-(.+))/;
const RE_VARIABLE_VALUE = /(?:--)?((.+)--(.+)-(.+))/;
const variableCollection = parseDeclarationValue(decl.value);
for (const variable of variableCollection) {
const matches = variable.match(RE_VARIABLE_VALUE);
@ -94,6 +109,15 @@ function addResolvedVariablesToRootSelector(root, {Rule, Declaration}) {
root.append(newRule);
}
function populateMapWithDerivedVariables(map, cssFileLocation) {
const location = cssFileLocation.match(/(.+)\/.+\.css/)?.[1];
const derivedVariables = [
...([...resolvedMap.keys()].filter(v => !aliasMap.has(v))),
...([...aliasMap.entries()].map(([alias, variable]) => `${alias}=${variable}`))
];
map.set(location, { "derived-variables": derivedVariables });
}
/**
* @callback derive
* @param {string} value - The base value on which an operation is applied
@ -104,6 +128,7 @@ function addResolvedVariablesToRootSelector(root, {Rule, Declaration}) {
*
* @param {Object} opts - Options for the plugin
* @param {derive} opts.derive - The callback which contains the logic for resolving derived variables
* @param {Map} opts.compiledVariables - A map that stores derived variables so that manifest source sections can be produced
*/
module.exports = (opts = {}) => {
aliasMap = new Map();
@ -112,7 +137,12 @@ module.exports = (opts = {}) => {
return {
postcssPlugin: "postcss-compile-variables",
Once(root, {Rule, Declaration}) {
Once(root, {Rule, Declaration, result}) {
const cssFileLocation = root.source.input.from;
if (cssFileLocation.includes("type=runtime")) {
// If this is a runtime theme, don't derive variables.
return;
}
/*
Go through the CSS file once to extract all aliases and base variables.
We use these when resolving derived variables later.
@ -120,6 +150,16 @@ module.exports = (opts = {}) => {
root.walkDecls(decl => extract(decl));
root.walkDecls(decl => resolveDerivedVariable(decl, opts.derive));
addResolvedVariablesToRootSelector(root, {Rule, Declaration});
if (opts.compiledVariables){
populateMapWithDerivedVariables(opts.compiledVariables, cssFileLocation);
}
// Publish both the base-variables and derived-variables to the other postcss-plugins
const combinedMap = new Map([...baseVariables, ...resolvedMap]);
result.messages.push({
type: "resolved-variable-map",
plugin: "postcss-compile-variables",
colorMap: combinedMap,
});
},
};
};

43
scripts/postcss/test.js
View file

@ -96,6 +96,7 @@ module.exports.tests = function tests() {
`;
await run( inputCSS, outputCSS, { }, assert);
},
"multiple aliased-derived variable in single declaration is parsed correctly": async (assert) => {
const inputCSS = `
:root {
@ -116,6 +117,48 @@ module.exports.tests = function tests() {
}
`;
await run( inputCSS, outputCSS, { }, assert);
},
"compiledVariables map is populated": async (assert) => {
const compiledVariables = new Map();
const inputCSS = `
:root {
--icon-color: #fff;
}
div {
background: var(--icon-color--darker-20);
--my-alias: var(--icon-color--darker-20);
color: var(--my-alias--lighter-15);
}`;
await postcss([plugin({ derive, compiledVariables })]).process(inputCSS, { from: "/foo/bar/test.css", });
const actualArray = compiledVariables.get("/foo/bar")["derived-variables"];
const expectedArray = ["icon-color--darker-20", "my-alias=icon-color--darker-20", "my-alias--lighter-15"];
assert.deepStrictEqual(actualArray.sort(), expectedArray.sort());
},
"derived variable are supported in urls": async (assert) => {
const inputCSS = `
:root {
--foo-color: #ff0;
}
div {
background-color: var(--foo-color--lighter-50);
background: url("./foo/bar/icon.svg?primary=foo-color--darker-5");
}
a {
background: url("foo/bar/icon.svg");
}`;
const transformedColorLighter = offColor("#ff0").lighten(0.5);
const transformedColorDarker = offColor("#ff0").darken(0.05);
const outputCSS =
inputCSS +
`
:root {
--foo-color--lighter-50: ${transformedColorLighter.hex()};
--foo-color--darker-5: ${transformedColorDarker.hex()};
}
`;
await run( inputCSS, outputCSS, {}, assert);
}
};
};