MDL-44357 theme: Allow core to compile LESS in PHP

lib/lessphp/Exception/Parser.php

@@ -0,0 +1,120 @@
+<?php
+
+/**
+ * Parser Exception
+ *
+ * @package Less
+ * @subpackage exception
+ */
+class Less_Exception_Parser extends Exception{
+
+	/**
+	 * The current file
+	 *
+	 * @var Less_ImportedFile
+	 */
+	public $currentFile;
+
+	/**
+	 * The current parser index
+	 *
+	 * @var integer
+	 */
+	public $index;
+
+	protected $input;
+
+	protected $details = array();
+
+
+	/**
+	 * Constructor
+	 *
+	 * @param string $message
+	 * @param Exception $previous Previous exception
+	 * @param integer $index The current parser index
+	 * @param Less_FileInfo|string $currentFile The file
+	 * @param integer $code The exception code
+	 */
+	public function __construct($message = null, Exception $previous = null, $index = null, $currentFile = null, $code = 0){
+
+		if (PHP_VERSION_ID < 50300) {
+			$this->previous = $previous;
+			parent::__construct($message, $code);
+		} else {
+			parent::__construct($message, $code, $previous);
+		}
+
+		$this->currentFile = $currentFile;
+		$this->index = $index;
+
+		$this->genMessage();
+	}
+
+
+	protected function getInput(){
+
+		if( !$this->input && $this->currentFile && $this->currentFile['filename'] ){
+			$this->input = file_get_contents( $this->currentFile['filename'] );
+		}
+	}
+
+
+
+	/**
+	 * Converts the exception to string
+	 *
+	 * @return string
+	 */
+	public function genMessage(){
+
+		if( $this->currentFile && $this->currentFile['filename'] ){
+			$this->message .= ' in '.basename($this->currentFile['filename']);
+		}
+
+		if( $this->index !== null ){
+			$this->getInput();
+			if( $this->input ){
+				$line = self::getLineNumber();
+				$this->message .= ' on line '.$line.', column '.self::getColumn();
+
+				$lines = explode("\n",$this->input);
+
+				$count = count($lines);
+				$start_line = max(0, $line-3);
+				$last_line = min($count, $start_line+6);
+				$num_len = strlen($last_line);
+				for( $i = $start_line; $i < $last_line; $i++ ){
+					$this->message .= "\n".str_pad($i+1,$num_len,'0',STR_PAD_LEFT).'| '.$lines[$i];
+				}
+			}
+		}
+
+	}
+
+	/**
+	 * Returns the line number the error was encountered
+	 *
+	 * @return integer
+	 */
+	public function getLineNumber(){
+		if( $this->index ){
+			return substr_count($this->input, "\n", 0, $this->index) + 1;
+		}
+		return 1;
+	}
+
+
+	/**
+	 * Returns the column the error was encountered
+	 *
+	 * @return integer
+	 */
+	public function getColumn(){
+
+		$part = substr($this->input, 0, $this->index);
+		$pos = strrpos($part,"\n");
+		return $this->index - $pos;
+	}
+
+}