| '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 = `${functionName.toLowerCase()}(`; |
| const lowerCaseSource = source.toLowerCase(); |
| |
| if (!lowerCaseSource.includes(nameWithParen)) { |
| return source; |
| } |
| |
| const functionNameLength = functionName.length; |
| |
| let result = source; |
| let searchStartIndex = 0; |
| |
| while (lowerCaseSource.includes(nameWithParen, searchStartIndex)) { |
| const openingParenIndex = |
| lowerCaseSource.indexOf(nameWithParen, searchStartIndex) + functionNameLength; |
| const parensMatch = balancedMatch('(', ')', lowerCaseSource.slice(openingParenIndex)); |
| |
| if (!parensMatch) { |
| throw new Error(`No parens match: "${source}"`); |
| } |
| |
| const closingParenIndex = parensMatch.end + openingParenIndex; |
| const argumentsLength = closingParenIndex - openingParenIndex - 1; |
| |
| result = |
| result.slice(0, openingParenIndex + 1) + |
| blurChar.repeat(argumentsLength) + |
| result.slice(closingParenIndex); |
| searchStartIndex = closingParenIndex; |
| } |
| |
| return result; |
| }; |