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'use strict';
const balancedMatch = require('balanced-match');
/**
* Replace all of the characters that are arguments to a certain
* CSS function with some innocuous character.
*
* This is useful if you need to use a RegExp to find a string
* but want to ignore matches in certain functions (e.g. `url()`,
* which might contain all kinds of false positives).
*
* For example:
* blurFunctionArguments("abc url(abc) abc", "url") === "abc url(```) abc"
*
* @param {string} source
* @param {string} functionName
* @return {string} - The result string, with the function arguments "blurred"
*/
module.exports = function(source, functionName, blurChar = '`') {
const nameWithParen = `${functionName.toLowerCase()}(`;
const lowerCaseSource = source.toLowerCase();
if (!lowerCaseSource.includes(nameWithParen)) {
return source;
}
const functionNameLength = functionName.length;
let result = source;
let searchStartIndex = 0;
while (lowerCaseSource.includes(nameWithParen, searchStartIndex)) {
const openingParenIndex =
lowerCaseSource.indexOf(nameWithParen, searchStartIndex) + functionNameLength;
const closingParenIndex =
balancedMatch('(', ')', lowerCaseSource.slice(openingParenIndex)).end + openingParenIndex;
const argumentsLength = closingParenIndex - openingParenIndex - 1;
result =
result.slice(0, openingParenIndex + 1) +
blurChar.repeat(argumentsLength) +
result.slice(closingParenIndex);
searchStartIndex = closingParenIndex;
}
return result;
};
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