import { ICodePosition } from './ICodePosition';

export class CodePosition implements ICodePosition {
  public get totalLines(): number {
    return this.endLine - this.startLine;
  }

  constructor(
    public readonly startLine: number,
    public readonly endLine: number,
  ) {
    if (startLine < 0) {
      throw new Error('Code cannot start in a negative line');
    }
    if (endLine < 0) {
      throw new Error('Code cannot end in a negative line');
    }
    if (endLine === startLine) {
      throw new Error('Empty code');
    }
    if (endLine < startLine) {
      throw new Error('End line cannot be less than start line');
    }
  }
}