private _readOrSeekToChunk()

in packages/selector/src/text/code-point-seeker.ts [89:121]

• 27 lines of code
• 7 McCabe index (conditional complexity)

  private _readOrSeekToChunk(
    read: true,
    target: TChunk,
    offset?: number,
  ): string[];
  private _readOrSeekToChunk(
    read: false,
    target: TChunk,
    offset?: number,
  ): void;
  private _readOrSeekToChunk(read: boolean, target: TChunk, offset = 0) {
    const oldRawPosition = this.raw.position;

    let s = this.raw.readToChunk(target, offset);

    const movedForward = this.raw.position >= oldRawPosition;

    if (movedForward && endsWithinCharacter(s)) {
      this.raw.seekBy(-1);
      s = s.slice(0, -1);
    } else if (!movedForward && startsWithinCharacter(s)) {
      this.raw.seekBy(1);
      s = s.slice(1);
    }

    const result = [...s];

    this.position = movedForward
      ? this.position + result.length
      : this.position - result.length;

    if (read) return result;
  }