<?php

namespace WikiPEG;

class Location implements \JsonSerializable {
  /** @var int 0-based byte offset into the input string */
  public $offset;
  /** @var int 1-based line number */
  public $line;
  /** @var int 1-based column number */
  public $column;

  /**
   * @param int $offset
   * @param int $line
   * @param int $column
   */
  public function __construct($offset, $line, $column) {
    $this->offset = $offset;
    $this->line = $line;
    $this->column = $column;
  }

  /** @return string */
  public function __toString() {
    return "{$this->line}:{$this->column}";
  }

  /**
   * Emit a JSON serialization similar to JS, for testing
   * @return array
   */
  public function jsonSerialize() {
    return [
      'offset' => $this->offset,
      'line' => $this->line,
      'column' => $this->column,
    ];
  }
}