strip trailing spaces

Parsedown.php

@@ -1,172 +1,172 @@
-<?php 
+<?php
 
-# 
+#
-# 
+#
 # Parsedown
 # http://parsedown.org
-# 
+#
-# (c) Emanuil Rusev 
+# (c) Emanuil Rusev
 # http://erusev.com
-# 
+#
-# For the full license information, please view the LICENSE file that was 
+# For the full license information, please view the LICENSE file that was
 # distributed with this source code.
-# 
+#
-# 
+#
 
 class Parsedown
 {
-	# 
+	#
-	# Multiton (http://en.wikipedia.org/wiki/Multiton_pattern) 
+	# Multiton (http://en.wikipedia.org/wiki/Multiton_pattern)
-	# 
+	#
-	
+
 	static function instance($name = 'default')
 	{
 		if (isset(self::$instances[$name]))
 			return self::$instances[$name];
-		
+
 		$instance = new Parsedown();
-		
+
 		self::$instances[$name] = $instance;
-		
+
 		return $instance;
 	}
-	
+
 	private static $instances = array();
-	
+
-	# 
+	#
-	# Fields 
+	# Fields
-	# 
+	#
-	
+
 	private $reference_map = array();
 	private $escape_sequence_map = array();
-	
+
-	# 
+	#
-	# Public Methods 
+	# Public Methods
-	# 
+	#
-	
+
 	function parse($text)
-	{	
+	{
 		# Removes UTF-8 BOM and marker characters.
 		$text = preg_replace('{^\xEF\xBB\xBF|\x1A}', '', $text);
-		
+
 		# Removes \r characters.
 		$text = str_replace("\r\n", "\n", $text);
 		$text = str_replace("\r", "\n", $text);
-		
+
 		# Replaces tabs with spaces.
 		$text = str_replace("\t", '    ', $text);
-		
+
 		# Encodes escape sequences.
-		
+
 		if (strpos($text, '\\') !== FALSE)
 		{
 			$escape_sequences = array('\\\\', '\`', '\*', '\_', '\{', '\}', '\[', '\]', '\(', '\)', '\>', '\#', '\+', '\-', '\.', '\!');
-			
+
 			foreach ($escape_sequences as $index => $escape_sequence)
 			{
 				if (strpos($text, $escape_sequence) !== FALSE)
 				{
 					$code = "\x1A".'\\'.$index;
-					
+
 					$text = str_replace($escape_sequence, $code, $text);
-					
+
 					$this->escape_sequence_map[$code] = $escape_sequence;
 				}
 			}
 		}
-		
+
-		# ~ 
+		# ~
-		
+
 		$text = preg_replace('/\n\s*\n/', "\n\n", $text);
 		$text = trim($text, "\n ");
-		
+
 		$lines = explode("\n", $text);
-		
+
 		$text = $this->parse_block_elements($lines);
-		
+
 		# Decodes escape sequences (leaves out backslashes).
-		
+
 		foreach ($this->escape_sequence_map as $code => $escape_sequence)
 		{
 			$text = str_replace($code, $escape_sequence[1], $text);
 		}
-		
+
 		$text = rtrim($text, "\n");
-		
+
 		return $text;
 	}
-	
+
-	# 
+	#
-	# Private Methods 
+	# Private Methods
-	# 
+	#
-	
+
 	private function parse_block_elements(array $lines, $context = '')
 	{
 		$elements = array();
-		
+
 		$element = array(
 			'type' => '',
 		);
-		
+
 		foreach ($lines as $line)
 		{
-			# Block-Level HTML 
+			# Block-Level HTML
-			
+
 			if ($element['type'] === 'block' and ! isset($element['closed']))
 			{
 				if (preg_match('{<'.$element['subtype'].'>$}', $line)) # <open>
 				{
 					$element['depth']++;
 				}
-				
+
 				if (preg_match('{</'.$element['subtype'].'>$}', $line)) # </close>
 				{
-					$element['depth'] > 0 
+					$element['depth'] > 0
-						? $element['depth']-- 
+						? $element['depth']--
 						: $element['closed'] = true;
 				}
-				
+
 				$element['text'] .= "\n".$line;
 
 				continue;
 			}
-			
+
-			# Empty 
+			# Empty
-			
+
 			if ($line === '')
 			{
 				$element['interrupted'] = true;
-				
+
 				continue;
 			}
-			
+
-			# Lazy Blockquote 
+			# Lazy Blockquote
-			
+
 			if ($element['type'] === 'blockquote' and ! isset($element['interrupted']))
 			{
 				$line = preg_replace('/^[ ]*>[ ]?/', '', $line);
-				
+
 				$element['lines'] []= $line;
-				
+
 				continue;
 			}
-			
+
-			# Lazy List Item 
+			# Lazy List Item
-			
+
 			if ($element['type'] === 'li')
 			{
 				if (preg_match('/^([ ]{0,3})(\d+[.]|[*+-])[ ](.*)/', $line, $matches))
 				{
-					if ($element['indentation'] !== $matches[1]) 
+					if ($element['indentation'] !== $matches[1])
 					{
 						$element['lines'] []= $line;
 					}
-					else 
+					else
 					{
 						unset($element['last']);
-						
+
 						$elements []= $element;
-						
+
 						$element = array(
 							'type' => 'li',
 							'indentation' => $matches[1],
@@ -176,42 +176,42 @@ class Parsedown
 							),
 						);
 					}
-					
+
 					continue;
 				}
-				
+
 				if (isset($element['interrupted']))
 				{
 					if ($line[0] === ' ')
 					{
 						$element['lines'] []= '';
-						
+
 						$line = preg_replace('/^[ ]{0,4}/', '', $line);;
-						
+
 						$element['lines'] []= $line;
-						
+
 						continue;
 					}
 				}
 				else
 				{
 					$line = preg_replace('/^[ ]{0,4}/', '', $line);;
-						
+
 					$element['lines'] []= $line;
-					
+
 					continue;
 				}
 			}
-			
+
-			# Quick Paragraph 
+			# Quick Paragraph
-			
+
 			if ($line[0] >= 'a' or $line[0] >= 'A' and $line[0] <= 'Z')
 			{
-				goto paragraph; # trust me 
+				goto paragraph; # trust me
 			}
-			
+
-			# Code 
+			# Code
-			
+
 			if ($line[0] === ' ' and preg_match('/^[ ]{4}(.*)/', $line, $matches))
 			{
 				if ($element['type'] === 'code')
@@ -219,16 +219,16 @@ class Parsedown
 					if (isset($element['interrupted']))
 					{
 						$element['text'] .= "\n";
-						
+
 						unset ($element['interrupted']);
 					}
-					
+
 					$element['text'] .= "\n".$matches[1];
 				}
 				else
 				{
 					$elements []= $element;
-					
+
 					$element = array(
 						'type' => 'code',
 						'text' => $matches[1],
@@ -237,62 +237,62 @@ class Parsedown
 
 				continue;
 			}
-			
+
-			# Setext Header (---)  
+			# Setext Header (---)
-			
+
 			if ($line[0] === '-' and $element['type'] === 'p' and ! isset($element['interrupted']) and preg_match('/^[-]+[ ]*$/', $line))
 			{
 				$element['type'] = 'h.';
 				$element['level'] = 2;
-				
+
 				continue;
 			}
-			
+
 			# Atx Header (#)
-			
+
 			if ($line[0] === '#' and preg_match('/^(#{1,6})[ ]*(.+?)[ ]*#*$/', $line, $matches))
 			{
 				$elements []= $element;
-				
+
 				$level = strlen($matches[1]);
-				
+
 				$element = array(
 					'type' => 'h.',
 					'text' => $matches[2],
 					'level' => $level,
 				);
-				
+
 				continue;
 			}
-			
+
-			# Setext Header (===) 
+			# Setext Header (===)
-			
+
 			if ($line[0] === '=' and $element['type'] === 'p' and ! isset($element['interrupted']) and preg_match('/^[=]+[ ]*$/', $line))
 			{
 				$element['type'] = 'h.';
 				$element['level'] = 1;
-				
+
 				continue;
 			}
-			
+
-			# ~ 
+			# ~
-			
+
 			$pure_line = $line[0] !== ' ' ? $line : ltrim($line);
-			
+
-			# Link Reference 
+			# Link Reference
-			
+
 			if ($pure_line[0] === '[' and preg_match('/^\[(.+?)\]:[ ]*([^ ]+)/', $pure_line, $matches))
 			{
 				$label = strtolower($matches[1]);
 				$url = trim($matches[2], '<>');
-				
+
 				$this->reference_map[$label] = $url;
-				
+
 				continue;
 			}
-			
+
-			# Blockquote 
+			# Blockquote
-			
+
 			if ($pure_line[0] === '>' and preg_match('/^>[ ]?(.*)/', $pure_line, $matches))
 			{
 				if ($element['type'] === 'blockquote')
@@ -300,16 +300,16 @@ class Parsedown
 					if (isset($element['interrupted']))
 					{
 						$element['lines'] []= '';
-						
+
 						unset($element['interrupted']);
 					}
-					
+
 					$element['lines'] []= $matches[1];
 				}
 				else
 				{
 					$elements []= $element;
-					
+
 					$element = array(
 						'type' => 'blockquote',
 						'lines' => array(
@@ -317,12 +317,12 @@ class Parsedown
 						),
 					);
 				}
-				
+
 				continue;
 			}
-			
+
-			# HTML  
+			# HTML
-			
+
 			if ($pure_line[0] === '<')
 			{
 				# Block-Level HTML <self-closing/>
@@ -338,7 +338,7 @@ class Parsedown
 
 					continue;
 				}
-				
+
 				# Block-Level HTML <open>
 
 				if (preg_match('{^<(\w+)(?:[ ].*?)?>}', $pure_line, $matches))
@@ -351,32 +351,32 @@ class Parsedown
 						'text' => $pure_line,
 						'depth' => 0,
 					);
-					
+
 					preg_match('{</'.$matches[1].'>\s*$}', $pure_line) and $element['closed'] = true;
 
 					continue;
 				}
 			}
-			
+
-			# Horizontal Rule   
+			# Horizontal Rule
-			
+
 			if (preg_match('/^([-*_])([ ]{0,2}\1){2,}[ ]*$/', $pure_line))
 			{
 				$elements []= $element;
-				
+
 				$element = array(
 					'type' => 'hr',
 				);
-				
+
 				continue;
 			}
-			
+
-			# List Item 
+			# List Item
-			
+
 			if (preg_match('/^([ ]*)(\d+[.]|[*+-])[ ](.*)/', $line, $matches))
 			{
 				$elements []= $element;
-				
+
 				$element = array(
 					'type' => 'li',
 					'ordered' => isset($matches[2][1]),
@@ -386,22 +386,22 @@ class Parsedown
 						preg_replace('/^[ ]{0,4}/', '', $matches[3]),
 					),
 				);
-				
+
 				continue;
 			}
-			
+
-			# ~ 
+			# ~
-			
+
 			paragraph:
-			
+
 			if ($element['type'] === 'p')
 			{
 				if (isset($element['interrupted']))
 				{
 					$elements []= $element;
-					
+
 					$element['text'] = $line;
-					
+
 					unset($element['interrupted']);
 				}
 				else
@@ -412,215 +412,215 @@ class Parsedown
 			else
 			{
 				$elements []= $element;
-				
+
 				$element = array(
-					'type' => 'p', 
+					'type' => 'p',
 					'text' => $line,
 				);
 			}
 		}
-		
+
 		$elements []= $element;
-		
+
 		array_shift($elements);
-		
+
-		# 
+		#
-		# ~ 
+		# ~
-		# 
+		#
-		
+
 		$markup = '';
-		
+
 		foreach ($elements as $index => $element)
 		{
 			switch ($element['type'])
 			{
 				case 'li':
-					
+
 					if (isset($element['ordered'])) # first
 					{
 						$list_type = $element['ordered'] ? 'ol' : 'ul';
-						
+
 						$markup .= '<'.$list_type.'>'."\n";
 					}
-					
+
 					if (isset($element['interrupted']) and ! isset($element['last']))
 					{
 						$element['lines'] []= '';
 					}
-					
+
 					$text = $this->parse_block_elements($element['lines'], 'li');
-					
+
 					$markup .= '<li>'.$text.'</li>'."\n";
-					
+
 					isset($element['last']) and $markup .= '</'.$list_type.'>'."\n";
-					
+
 					break;
-				
+
 				case 'p':
-					
+
 					$text = $this->parse_inline_elements($element['text']);
-					
+
 					$text = preg_replace('/[ ]{2}\n/', '<br />'."\n", $text);
-					
+
 					if ($context === 'li' and $index === 0)
 					{
 						if (isset($element['interrupted']))
 						{
 							$markup .= "\n".'<p>'.$text.'</p>'."\n";
 						}
-						else 
+						else
 						{
 							$markup .= $text;
 						}
 					}
-					else 
+					else
 					{
 						$markup .= '<p>'.$text.'</p>'."\n";
 					}
-					
+
 					break;
-				
+
 				case 'code':
-					
+
 					$text = htmlentities($element['text'], ENT_NOQUOTES);
-					
+
 					strpos($text, "\x1A\\") !== FALSE and $text = strtr($text, $this->escape_sequence_map);
-					
+
 					$markup .= '<pre><code>'.$text.'</code></pre>'."\n";
-					
+
 					break;
-				
+
 				case 'blockquote':
-					
+
 					$text = $this->parse_block_elements($element['lines']);
-					
+
 					$markup .= '<blockquote>'."\n".$text.'</blockquote>'."\n";
-					
+
 					break;
-				
+
 				case 'h.':
-					
+
 					$text = $this->parse_inline_elements($element['text']);
-					
+
 					$markup .= '<h'.$element['level'].'>'.$text.'</h'.$element['level'].'>'."\n";
-					
+
 					break;
-				
+
 				case 'hr':
-					
+
 					$markup .= '<hr />'."\n";
-					
+
 					break;
 
 				default:
-					
+
 					$markup .= $element['text']."\n";
 			}
 		}
-		
+
 		return $markup;
 	}
-	
+
 	private function parse_inline_elements($text)
 	{
 		$map = array();
-		
+
 		$index = 0;
-		
+
-		# Code Span 
+		# Code Span
-		
+
-		if (strpos($text, '`') !== FALSE and preg_match_all('/`(.+?)`/', $text, $matches, PREG_SET_ORDER)) 
+		if (strpos($text, '`') !== FALSE and preg_match_all('/`(.+?)`/', $text, $matches, PREG_SET_ORDER))
 		{
 			foreach ($matches as $matches)
 			{
 				$element_text = $matches[1];
 				$element_text = htmlentities($element_text, ENT_NOQUOTES);
-				
+
 				# Decodes escape sequences.
-				
+
-				$this->escape_sequence_map 
+				$this->escape_sequence_map
-					and strpos($element_text, "\x1A") !== FALSE 
+					and strpos($element_text, "\x1A") !== FALSE
 					and $element_text = strtr($element_text, $this->escape_sequence_map);
-				
+
 				# Composes element.
-				
+
 				$element = '<code>'.$element_text.'</code>';
-				
+
 				# Encodes element.
-				
+
 				$code = "\x1A".'$'.$index;
-				
+
 				$text = str_replace($matches[0], $code, $text);
-				
+
 				$map[$code] = $element;
-				
+
 				$index ++;
 			}
 		}
-		
+
-		# Inline Link / Image 
+		# Inline Link / Image
-		
+
-		if (strpos($text, '](') !== FALSE and preg_match_all('/(!?)(\[((?:[^\[\]]|(?2))*)\])\((.*?)\)/', $text, $matches, PREG_SET_ORDER)) # inline 
+		if (strpos($text, '](') !== FALSE and preg_match_all('/(!?)(\[((?:[^\[\]]|(?2))*)\])\((.*?)\)/', $text, $matches, PREG_SET_ORDER)) # inline
 		{
 			foreach ($matches as $matches)
 			{
 				$url = $matches[4];
-				
+
 				strpos($url, '&') !== FALSE and $url = preg_replace('/&(?!#?\w+;)/', '&amp;', $url);
-				
+
-				if ($matches[1]) # image 
+				if ($matches[1]) # image
 				{
 					$element = '<img alt="'.$matches[3].'" src="'.$url.'">';
 				}
 				else
 				{
 					$element_text = $this->parse_inline_elements($matches[3]);
-					
+
 					$element = '<a href="'.$url.'">'.$element_text.'</a>';
 				}
-				
+
-				# ~ 
+				# ~
 
 				$code = "\x1A".'$'.$index;
 
 				$text = str_replace($matches[0], $code, $text);
 
 				$map[$code] = $element;
-				
+
 				$index ++;
 			}
 		}
-		
+
-		# Reference(d) Link / Image 
+		# Reference(d) Link / Image
-		
+
 		if ($this->reference_map and strpos($text, '[') !== FALSE and preg_match_all('/(!?)\[(.+?)\](?:\n?[ ]?\[(.*?)\])?/ms', $text, $matches, PREG_SET_ORDER))
 		{
 			foreach ($matches as $matches)
 			{
 				$link_definition = isset($matches[3]) && $matches[3]
 					? $matches[3]
-					: $matches[2]; # implicit 
+					: $matches[2]; # implicit
-				
+
 				$link_definition = strtolower($link_definition);
-				
+
 				if (isset($this->reference_map[$link_definition]))
 				{
 					$url = $this->reference_map[$link_definition];
-					
+
 					strpos($url, '&') !== FALSE and $url = preg_replace('/&(?!#?\w+;)/', '&amp;', $url);
-					
+
-					if ($matches[1]) # image 
+					if ($matches[1]) # image
 					{
 						$element = '<img alt="'.$matches[2].'" src="'.$url.'">';
 					}
-					else # anchor 
+					else # anchor
 					{
 						$element_text = $this->parse_inline_elements($matches[2]);
 
 						$element = '<a href="'.$url.'">'.$element_text.'</a>';
 					}
 
-					# ~ 
+					# ~
 
 					$code = "\x1A".'$'.$index;
 
@@ -632,54 +632,54 @@ class Parsedown
 				}
 			}
 		}
-		
+
-		# Automatic Links 
+		# Automatic Links
-		
+
 		if (strpos($text, '<') !== FALSE and preg_match_all('/<((https?|ftp|dict):[^\^\s]+?)>/i', $text, $matches, PREG_SET_ORDER))
 		{
 			foreach ($matches as $matches)
 			{
 				$url = $matches[1];
-				
+
 				strpos($url, '&') !== FALSE and $url = preg_replace('/&(?!#?\w+;)/', '&amp;', $url);
-				
+
 				$element = '<a href=":href">:text</a>';
 				$element = str_replace(':text', $url, $element);
 				$element = str_replace(':href', $url, $element);
-				
+
-				# ~ 
+				# ~
-				
+
 				$code = "\x1A".'$'.$index;
-				
+
 				$text = str_replace($matches[0], $code, $text);
-				
+
 				$map[$code] = $element;
-				
+
 				$index ++;
 			}
 		}
-		
+
-		# ~ 
+		# ~
-		
+
 		strpos($text, '&') !== FALSE and $text = preg_replace('/&(?!#?\w+;)/', '&amp;', $text);
 		strpos($text, '<') !== FALSE and $text = preg_replace('/<(?!\/?\w.*?>)/', '&lt;', $text);
-		
+
-		# ~ 
+		# ~
-		
+
 		if (strpos($text, '_') !== FALSE)
 		{
 			$text = preg_replace('/__(?=\S)(.+?)(?<=\S)__/', '<strong>$1</strong>', $text);
 			$text = preg_replace('/_(?=\S)(.+?)(?<=\S)_/', '<em>$1</em>', $text);
 		}
-		
+
 		if (strpos($text, '*') !== FALSE)
 		{
 			$text = preg_replace('/\*\*(?=\S)(.+?)(?<=\S)\*\*/', '<strong>$1</strong>', $text);
 			$text = preg_replace('/\*(?=\S)(.+?)(?<=\S)\*/', '<em>$1</em>', $text);
 		}
-		
+
 		$text = strtr($text, $map);
-		
+
 		return $text;
 	}
 }