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Edit File: Mapped.php

<?php

/**
 * Parser output with source map
 *
 * @package Less
 * @subpackage Output
 */
class Less_Output_Mapped extends Less_Output {

/**
	 * The source map generator
	 *
	 * @var Less_SourceMap_Generator
	 */
	protected $generator;

/**
	 * Current line
	 *
	 * @var integer
	 */
	protected $lineNumber = 0;

/**
	 * Current column
	 *
	 * @var integer
	 */
	protected $column = 0;

/**
	 * Array of contents map (file and its content)
	 *
	 * @var array
	 */
	protected $contentsMap = array();

/**
	 * Constructor
	 *
	 * @param array $contentsMap Array of filename to contents map
	 * @param Less_SourceMap_Generator $generator
	 */
	public function __construct(array $contentsMap, $generator){
		$this->contentsMap = $contentsMap;
		$this->generator = $generator;
	}

/**
	 * Adds a chunk to the stack
	 * The $index for less.php may be different from less.js since less.php does not chunkify inputs
	 *
	 * @param string $chunk
	 * @param string $fileInfo
	 * @param integer $index
	 * @param mixed $mapLines
	 */
	public function add($chunk, $fileInfo = null, $index = 0, $mapLines = null){

//ignore adding empty strings
		if( $chunk === '' ){
			return;
		}

$sourceLines = array();
		$sourceColumns = ' ';

if( $fileInfo ){

$url = $fileInfo['currentUri'];

if( isset($this->contentsMap[$url]) ){
				$inputSource = substr($this->contentsMap[$url], 0, $index);
				$sourceLines = explode("\n", $inputSource);
				$sourceColumns = end($sourceLines);
			}else{
				throw new Exception('Filename '.$url.' not in contentsMap');
			}

}

$lines = explode("\n", $chunk);
		$columns = end($lines);

if($fileInfo){

if(!$mapLines){
				$this->generator->addMapping(
						$this->lineNumber + 1,					// generated_line
						$this->column,							// generated_column
						count($sourceLines),					// original_line
						strlen($sourceColumns),					// original_column
						$fileInfo
				);
			}else{
				for($i = 0, $count = count($lines); $i < $count; $i++){
					$this->generator->addMapping(
						$this->lineNumber + $i + 1,				// generated_line
						$i === 0 ? $this->column : 0,			// generated_column
						count($sourceLines) + $i,				// original_line
						$i === 0 ? strlen($sourceColumns) : 0, 	// original_column
						$fileInfo
					);
				}
			}
		}

if(count($lines) === 1){
			$this->column += strlen($columns);
		}else{
			$this->lineNumber += count($lines) - 1;
			$this->column = strlen($columns);
		}

// add only chunk
		parent::add($chunk);
	}

}

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