Fragment.php
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Fragment.php
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	<?php
	/**
	* @author Niklas Laxström, Tim Starling
	* @license GPL-2.0-or-later
	* @file
	*/

	namespace CLDRPluralRuleParser\Converter;

	use CLDRPluralRuleParser\Converter;
	use CLDRPluralRuleParser\Error;

	/**
	* Helper for Converter.
	* The base class for operators and expressions, describing a region of the input string.
	*/
	class Fragment {
	/**
	* @var Converter
	*/
	public $parser;

	/**
	* @var int
	*/
	public $pos;

	/**
	* @var int
	*/
	public $length;

	/**
	* @var int
	*/
	public $end;

	/**
	* @param Converter $parser
	* @param int $pos
	* @param int $length
	*/
	public function __construct( Converter $parser, $pos, $length ) {
	$this->parser = $parser;
	$this->pos = $pos;
	$this->length = $length;
	$this->end = $pos + $length;
	}

	/**
	* @param string $message
	*
	* @throws Error
	*/
	public function error( $message ) {
	$text = $this->getText();
	throw new Error( "$message at position " . ( $this->pos + 1 ) . ": \"$text\"" );
	}

	/**
	* @return string
	*/
	public function getText() {
	return substr( $this->parser->rule, $this->pos, $this->length );
	}
	}