Method _replaceRegexp

src/MagicString.ts:1198–1249

@internal

(searchValue: RegExp, replacement: string | ReplacementFunction)

  /** @internal */
  _replaceRegexp(searchValue: RegExp, replacement: string | ReplacementFunction): this {
    function getReplacement(match: RegExpMatchArray, str: string): string {
      if (typeof replacement === 'string') {
        return replacement.replace(/\$(\$|&|\d+)/g, (_: string, i: string) => {
          // https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/String/replace#specifying_a_string_as_a_parameter
          if (i === '$')
            return '$'
          if (i === '&')
            return match[0]
          const num = +i
          if (num < match.length)
            return match[+i]
          return `$${i}`
        })
      }
      else {
        return replacement(match[0], ...match.slice(1), match.index, str, match.groups)
      }
    }
    function matchAll(re: RegExp, str: string): RegExpExecArray[] {
      const matches = []
      while (true) {
        const match = re.exec(str)
        if (!match)
          break

        matches.push(match)
      }
      return matches
    }
    if (searchValue.global) {
      const matches = matchAll(searchValue, this.original)
      matches.forEach((match) => {
        if (match.index != null) {
          const replacement = getReplacement(match, this.original)
          if (replacement !== match[0]) {
            this.overwrite(match.index, match.index + match[0].length, replacement)
          }
        }
      })
    }
    else {
      const match = this.original.match(searchValue)
      if (match && match.index != null) {
        const replacement = getReplacement(match, this.original)
        if (replacement !== match[0]) {
          this.overwrite(match.index, match.index + match[0].length, replacement)
        }
      }
    }
    return this
  }

  /** @internal */
  _replaceString(string: string, replacement: string | ReplacementFunction): this {