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Copy pathcss-tree-parser.ts
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152 lines (129 loc) · 3.49 KB
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import * as cssTree from 'css-tree';
function mapSelectors(selector: string): string[] {
if (!selector) {
return [];
}
// escaped commas (Tailwind arbitrary values) are part of the selector
return selector
.replace(/\\[\s\S]/g, (m) => (m === '\\,' ? '\\\u200C' : m))
.split(/\s*(?![^(]*\)),\s*/)
.map((s) => s.replace(/\u200C/g, ','));
}
function mapPosition(node, css) {
const res: any = {
start: {
line: node.loc.start.line,
column: node.loc.start.column,
},
end: {
line: node.loc.end.line,
column: node.loc.end.column,
},
content: css,
};
if (node.loc.source && node.loc.source !== '<unknown>') {
res.source = node.loc.source;
}
return res;
}
function transformAst(node, css, type = null) {
if (!node) {
return;
}
if (node.type === 'StyleSheet') {
return {
type: 'stylesheet',
stylesheet: {
rules: node.children
.map((child) => transformAst(child, css))
.filter((child) => child !== null)
.toArray(),
parsingErrors: [],
},
};
}
if (node.type === 'Atrule') {
const atrule: any = {
type: node.name,
};
if (node.name === 'supports' || node.name === 'media') {
atrule[node.name] = node.prelude.value;
atrule.rules = transformAst(node.block, css);
} else if (node.name === 'page') {
atrule.selectors = node.prelude ? mapSelectors(node.prelude.value) : [];
atrule.declarations = transformAst(node.block, css);
} else if (node.name === 'document') {
atrule.document = node.prelude ? node.prelude.value : '';
atrule.vendor = '';
atrule.rules = transformAst(node.block, css);
} else if (node.name === 'font-face') {
atrule.declarations = transformAst(node.block, css);
} else if (node.name === 'import' || node.name === 'charset' || node.name === 'namespace') {
atrule[node.name] = node.prelude ? node.prelude.value : '';
} else if (node.name === 'keyframes') {
atrule.name = node.prelude ? node.prelude.value : '';
atrule.keyframes = transformAst(node.block, css, 'keyframe');
atrule.vendor = undefined;
} else {
atrule.rules = transformAst(node.block, css);
}
atrule.position = mapPosition(node, css);
return atrule;
}
if (node.type === 'Block') {
return node.children
.map((child) => transformAst(child, css, type))
.filter((child) => child !== null)
.toArray();
}
if (node.type === 'Rule') {
const value = node.prelude.value;
const res: any = {
type: type != null ? type : 'rule',
declarations: transformAst(node.block, css),
position: mapPosition(node, css),
};
if (type === 'keyframe') {
res.values = mapSelectors(value);
} else {
res.selectors = mapSelectors(value);
}
return res;
}
if (node.type === 'Comment') {
return {
type: 'comment',
comment: node.value,
position: mapPosition(node, css),
};
}
if (node.type === 'Declaration') {
return {
type: 'declaration',
property: node.property,
value: node.value.value ? node.value.value.trim() : '',
position: mapPosition(node, css),
};
}
if (node.type === 'Raw') {
return null;
}
throw Error(`Unknown node type ${node.type}`);
}
export function cssTreeParse(css, source): any {
const errors = [];
const ast = cssTree.parse(css, {
parseValue: false,
parseAtrulePrelude: false,
parseRulePrelude: false,
positions: true,
filename: source,
onParseError: (error) => {
errors.push(`${source}:${error.line}:${error.column}: ${error.formattedMessage}`);
},
});
if (errors.length > 0) {
throw new Error(errors[0]);
}
return transformAst(ast, css);
}