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44 lines
1.7 KiB
JavaScript
44 lines
1.7 KiB
JavaScript
/* @flow */
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"use strict"
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const _ = require("lodash")
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const balancedMatch = require("balanced-match")
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/**
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* Replace all of the characters that are arguments to a certain
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* CSS function with some innocuous character.
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*
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* This is useful if you need to use a RegExp to find a string
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* but want to ignore matches in certain functions (e.g. `url()`,
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* which might contain all kinds of false positives).
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*
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* For example:
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* blurFunctionArguments("abc url(abc) abc", "url") === "abc url(```) abc"
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*
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* @param {string} source
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* @param {string} functionName
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* @param {[string]} blurChar="`"
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* @return {string} - The result string, with the function arguments "blurred"
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*/
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module.exports = function (source/*: string*/, functionName/*: string*/)/*: string*/ {
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const blurChar/*: string*/ = arguments.length > 2 && arguments[2] !== undefined ? arguments[2] : "`"
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const nameWithParen = `${functionName.toLowerCase()}(`
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const lowerCaseSource = source.toLowerCase()
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if (!_.includes(lowerCaseSource, nameWithParen)) {
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return source
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}
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const functionNameLength/*: number*/ = functionName.length
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let result = source
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let searchStartIndex = 0
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while (lowerCaseSource.indexOf(nameWithParen, searchStartIndex) !== -1) {
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const openingParenIndex = lowerCaseSource.indexOf(nameWithParen, searchStartIndex) + functionNameLength
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const closingParenIndex = balancedMatch("(", ")", lowerCaseSource.slice(openingParenIndex)).end + openingParenIndex
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const argumentsLength = closingParenIndex - openingParenIndex - 1
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result = result.slice(0, openingParenIndex + 1) + _.repeat(blurChar, argumentsLength) + result.slice(closingParenIndex)
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searchStartIndex = closingParenIndex
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}
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return result
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}
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