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[DNM] JSON theme AST #4889

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[DNM] JSON theme AST #4889

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b64d105
parse using ast
origami-z Mar 23, 2025
df34956
todos
origami-z Mar 25, 2025
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209 changes: 209 additions & 0 deletions packages/theme/json/parsers/cssTreeTest.js
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Original file line number Diff line number Diff line change
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const csstree = require("css-tree");

// Sample CSS content
const cssContent = `
.class1 {
--color-primary: red;
--color-secondary: blue;
}
.class1[data-theme="dark"] {
--color-primary: black;
--color-background: gray;
}
.class2 {
--color-accent: green;
}
[data-theme="light"].class1 {
--color-primary: white;
}

/*
TODO: discuss whether this should be an actual file, or should inline these values.
con: If we offer these values, then it could misleading that we're offering all these values
*/
.salt-theme.salt-theme-next {
--salt-color-blue-200-40a: rgba(var(--salt-color-blue-200-rgb), 0.4);
--salt-color-blue-300-40a: rgba(var(--salt-color-blue-300-rgb), 0.4);
--salt-color-blue-400-40a: rgba(var(--salt-color-blue-400-rgb), 0.4);
--salt-color-blue-500-40a: rgba(var(--salt-color-blue-500-rgb), 0.4);
--salt-color-blue-600-40a: rgba(var(--salt-color-blue-600-rgb), 0.4);
--salt-color-blue-700-40a: rgba(var(--salt-color-blue-700-rgb), 0.4);
--salt-color-blue-800-40a: rgba(var(--salt-color-blue-800-rgb), 0.4);
--salt-color-gray-300-10a: rgba(var(--salt-color-gray-300-rgb), 0.1);
--salt-color-gray-300-40a: rgba(var(--salt-color-gray-300-rgb), 0.4);
--salt-color-gray-400-40a: rgba(var(--salt-color-gray-400-rgb), 0.4);
--salt-color-gray-500-10a: rgba(var(--salt-color-gray-500-rgb), 0.1);
--salt-color-gray-500-40a: rgba(var(--salt-color-gray-500-rgb), 0.4);
--salt-color-gray-600-40a: rgba(var(--salt-color-gray-600-rgb), 0.4);
--salt-color-gray-700-10a: rgba(var(--salt-color-gray-700-rgb), 0.1);
--salt-color-gray-700-40a: rgba(var(--salt-color-gray-700-rgb), 0.4);
--salt-color-green-400-40a: rgba(var(--salt-color-green-400-rgb), 0.4);
--salt-color-green-500-40a: rgba(var(--salt-color-green-500-rgb), 0.4);
--salt-color-green-600-40a: rgba(var(--salt-color-green-600-rgb), 0.4);
--salt-color-orange-400-40a: rgba(var(--salt-color-orange-400-rgb), 0.4);
--salt-color-orange-500-40a: rgba(var(--salt-color-orange-500-rgb), 0.4);
--salt-color-orange-600-40a: rgba(var(--salt-color-orange-600-rgb), 0.4);
--salt-color-red-400-40a: rgba(var(--salt-color-red-400-rgb), 0.4);
--salt-color-red-500-40a: rgba(var(--salt-color-red-500-rgb), 0.4);
--salt-color-red-600-40a: rgba(var(--salt-color-red-600-rgb), 0.4);
--salt-color-teal-200-40a: rgba(var(--salt-color-teal-200-rgb), 0.4);
--salt-color-teal-300-40a: rgba(var(--salt-color-teal-300-rgb), 0.4);
--salt-color-teal-400-40a: rgba(var(--salt-color-teal-400-rgb), 0.4);
--salt-color-teal-500-40a: rgba(var(--salt-color-teal-500-rgb), 0.4);
--salt-color-teal-600-40a: rgba(var(--salt-color-teal-600-rgb), 0.4);
--salt-color-teal-700-40a: rgba(var(--salt-color-teal-700-rgb), 0.4);
--salt-color-teal-800-40a: rgba(var(--salt-color-teal-800-rgb), 0.4);
--salt-color-background-snow-40a: rgba(var(--salt-color-background-snow-rgb), 0.4);
--salt-color-background-marble-40a: rgba(var(--salt-color-background-marble-rgb), 0.4);
--salt-color-background-limestone-40a: rgba(var(--salt-color-background-limestone-rgb), 0.4);
--salt-color-background-granite-40a: rgba(var(--salt-color-background-granite-rgb), 0.4);
--salt-color-background-jet-40a: rgba(var(--salt-color-background-jet-rgb), 0.4);
--salt-color-background-leather-40a: rgba(var(--salt-color-background-leather-rgb), 0.4);
}

`;

// Parse the CSS content into an AST
const ast = csstree.parse(cssContent);

function matchSelectorRule(child, rule) {
const { type, value } = rule;
switch (type) {
case "classname": {
return child.type === "ClassSelector" && child.name === value;
}
case "data-attribute": {
return (
child.type === "AttributeSelector" &&
child.name.name === value.name &&
child.value &&
child.value.value === value.value
);
}
default: {
console.warn("Unknown rule type", type);
return false;
}
}
}

// Function to extract CSS variables for a given rules, e.g., matching classname, or data attribute
// [{type: 'classname', value: 'class1'}, {type: 'data-attribute', value: {name: 'data-theme', value: 'light'}}]
function extractCSSVariablesForMatchingRules(ast, rules) {
const variables = {};

// Traverse the AST
csstree.walk(ast, (node) => {
if (node.type === "Rule" && node.prelude.type === "SelectorList") {
// Check if the selector matches the given classname and data attribute
const selectorListChildren = node.prelude.children;
// console.log({ selectorListChildren, size: selectorListChildren.size });
const rulesMatched = selectorListChildren.some((selector) => {
for (const rule of rules) {
console.log({
"selector.children.size": selector.children.size,
"rules.length": rules.length,
});
if (
selector.children.size !== rules.length ||
!selector.children.some((c) => matchSelectorRule(c, rule))
) {
return false;
}
}

return true;
});

if (rulesMatched) {
// Traverse the declaration block to find CSS variables
csstree.walk(node.block, (declaration) => {
if (
declaration.type === "Declaration" &&
declaration.property.startsWith("--")
) {
variables[declaration.property] = csstree.generate(
declaration.value,
);
}
});
}
}
});

return variables;
}

// Function to extract CSS variables for a given classname and data attribute
function extractCSSVariablesForClassAndData(ast, className, dataAttribute) {
const variables = {};

// Traverse the AST
csstree.walk(ast, (node) => {
if (node.type === "Rule" && node.prelude.type === "SelectorList") {
// Check if the selector matches the given classname and data attribute
const hasClassAndData = node.prelude.children.some((selector) => {
let hasClass = false;
let hasData = false;

// Traverse the selector's children to check for class and data attribute
for (const child of selector.children) {
if (child.type === "ClassSelector" && child.name === className) {
hasClass = true;
}
if (
child.type === "AttributeSelector" &&
child.name.name === dataAttribute.name &&
child.value &&
child.value.value === dataAttribute.value
) {
hasData = true;
}
}

return hasClass && hasData;
});

if (hasClassAndData) {
// Traverse the declaration block to find CSS variables
csstree.walk(node.block, (declaration) => {
if (
declaration.type === "Declaration" &&
declaration.property.startsWith("--")
) {
variables[declaration.property] = csstree.generate(
declaration.value,
);
}
});
}
}
});

return variables;
}

// Example usage: Extract CSS variables for `.class1` with `[data-theme="dark"]`
const className = "class1";
const dataAttribute = { name: "data-theme", value: "dark" };

const rules = [
{ type: "classname", value: "class1" },
{ type: "data-attribute", value: { name: "data-theme", value: "light" } },
];
const themeNextRules = [
{ type: "classname", value: "salt-theme" },
{ type: "classname", value: "salt-theme-next" },
// { type: "data-attribute", value: { name: "data-theme", value: "light" } },
];
const cssVariables2 = extractCSSVariablesForMatchingRules(ast, rules);
console.log("extractCSSVariablesForMatchingRules", cssVariables2);

const cssVariables = extractCSSVariablesForClassAndData(
ast,
className,
dataAttribute,
);

console.log("extractCSSVariablesForClassAndData", cssVariables);
// Output: { '--color-primary': 'black', '--color-background': 'gray' }
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