Class ConstantRegex

packages/just-bash/src/regex/user-regex.ts:520–609

 * Implements the same interface as UserRegex for consistency.
 */
export class ConstantRegex implements RegexLike {
  private readonly _regex: RegExp;

  constructor(regex: RegExp) {
    this._regex = regex;
  }

  test(input: string): boolean {
    if (this._regex.global) {
      this._regex.lastIndex = 0;
    }
    return this._regex.test(input);
  }

  exec(input: string): RegExpExecArray | null {
    return this._regex.exec(input);
  }

  match(input: string): RegExpMatchArray | null {
    if (this._regex.global) {
      this._regex.lastIndex = 0;
    }
    return input.match(this._regex);
  }

  replace(input: string, replacement: string | ReplaceCallback): string {
    if (this._regex.global) {
      this._regex.lastIndex = 0;
    }
    return input.replace(
      this._regex,
      replacement as (substring: string, ...args: unknown[]) => string,
    );
  }

  split(input: string, limit?: number): string[] {
    return input.split(this._regex, limit);
  }

  search(input: string): number {
    return input.search(this._regex);
  }

  *matchAll(input: string): IterableIterator<RegExpMatchArray> {
    if (!this._regex.global) {
      throw new Error("matchAll requires global flag");
    }
    this._regex.lastIndex = 0;
    let match = this._regex.exec(input);
    while (match !== null) {
      yield match;
      if (match[0].length === 0) {
        this._regex.lastIndex++;
      }
      match = this._regex.exec(input);
    }
  }