44 lines
1.4 KiB
JavaScript
44 lines
1.4 KiB
JavaScript
'use strict';
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const balancedMatch = require('balanced-match');
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const valueParser = require('postcss-value-parser');
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const { assert, isString, isRegExp } = require('./validateTypes');
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/**
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* Search a CSS string for functions by name.
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* For every match, invoke the callback, passing the function's
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* "argument(s) string" (whatever is inside the parentheses)
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* as an argument.
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*
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* Callback will be called once for every matching function found,
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* with the function's "argument(s) string" and its starting index
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* as the arguments.
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*
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* @param {string} source
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* @param {string | RegExp} functionName
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* @param {(expression: string, expressionIndex: number, funcNode: valueParser.FunctionNode) => void} callback
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* @returns {valueParser.ParsedValue}
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*/
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module.exports = function functionArgumentsSearch(source, functionName, callback) {
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return valueParser(source).walk((node) => {
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if (node.type !== 'function') return;
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const { value } = node;
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if (isString(functionName) && value !== functionName) return;
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if (isRegExp(functionName) && !functionName.test(node.value)) return;
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const parensMatch = balancedMatch('(', ')', source.slice(node.sourceIndex));
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assert(parensMatch);
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const expression = parensMatch.body;
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const parenLength = 1; // == '('
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const expressionIndex = node.sourceIndex + value.length + parenLength;
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callback(expression, expressionIndex, node);
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});
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};
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