Method _replaceString

src/MagicString.ts:1511–1544

@internal

(string: string, replacement: string | ReplacementFunction)

  /** @internal */
  _replaceString(string: string, replacement: string | ReplacementFunction): this {
    const { original } = this

    // skip occurrences whose characters have been removed, so the first match
    // still present in the output is the one replaced
    let index = original.indexOf(string)
    while (index !== -1) {
      if (this._hasRemovedContent(index, index + string.length)) {
        index = original.indexOf(string, index + string.length)
        continue
      }

      if (typeof replacement === 'function') {
        replacement = replacement(string, index, original)
      }
      else {
        replacement = expandReplacement(replacement, string, index, original, [], undefined)
      }
      if (string !== replacement) {
        if (string.length === 0) {
          // an empty search string matches the empty range at the start of the
          // string, which has no characters to overwrite - the replacement is an
          // insertion there, as it is for `String.prototype.replace`
          this.appendRight(index, replacement)
        }
        else {
          this.overwrite(index, index + string.length, replacement)
        }
      }
      break
    }

    return this
  }

  /**
   * String replacement with RegExp or string.