Method processSelection

packages/2d/src/lib/code/CodeCursor.ts:398–430

(
    selection: {before: number | null; after: number | null},
    skipAhead: number,
    hasOffset: boolean,
    stringLength: number,
    y: number,
  )

  }

  private processSelection(
    selection: {before: number | null; after: number | null},
    skipAhead: number,
    hasOffset: boolean,
    stringLength: number,
    y: number,
  ): boolean {
    let shouldBreak = false;
    let currentSelected = this.isSelected(
      (hasOffset ? this.beforeCursor.x + stringLength : stringLength) +
        skipAhead,
      this.beforeCursor.y + y,
    );
    if (selection.before !== null && selection.before !== currentSelected) {
      shouldBreak = true;
    } else {
      selection.before = currentSelected;
    }

    currentSelected = this.isSelected(
      (hasOffset ? this.afterCursor.x + stringLength : stringLength) +
        skipAhead,
      this.afterCursor.y + y,
      true,
    );
    if (selection.after !== null && selection.after !== currentSelected) {
      shouldBreak = true;
    } else {
      selection.after = currentSelected;
    }

    return shouldBreak;
  }

  private isSelected(x: number, y: number, isAfter?: boolean): number {
    const point: CodePoint = [y, x];