fix: make some regexes a bit faster and make tab char equivalent to 4 spaces

Author: tivie

dist/showdown.js

@@ -53,79 +53,15 @@ showdown.subParser('anchors', function (text, options, globals) {
   };
 
   // First, handle reference-style links: [link text] [id]
-  /*
-   text = text.replace(/
-   (							// wrap whole match in $1
-   \[
-   (
-   (?:
-   \[[^\]]*\]		// allow brackets nested one level
-   |
-   [^\[]			// or anything else
-   )*
-   )
-   \]
-
-   [ ]?					// one optional space
-   (?:\n[ ]*)?				// one optional newline followed by spaces
-
-   \[
-   (.*?)					// id = $3
-   \]
-   )()()()()					// pad remaining backreferences
-   /g,_DoAnchors_callback);
-   */
   text = text.replace(/(\[((?:\[[^\]]*]|[^\[\]])*)][ ]?(?:\n[ ]*)?\[(.*?)])()()()()/g, writeAnchorTag);
 
-  //
   // Next, inline-style links: [link text](url "optional title")
-  //
-
-  /*
-   text = text.replace(/
-   (						// wrap whole match in $1
-   \[
-   (
-   (?:
-   \[[^\]]*\]	// allow brackets nested one level
-   |
-   [^\[\]]			// or anything else
-   )
-   )
-   \]
-   \(						// literal paren
-   [ \t]*
-   ()						// no id, so leave $3 empty
-   <?(.*?)>?				// href = $4
-   [ \t]*
-   (						// $5
-   (['"])				// quote char = $6
-   (.*?)				// Title = $7
-   \6					// matching quote
-   [ \t]*				// ignore any spaces/tabs between closing quote and )
-   )?						// title is optional
-   \)
-   )
-   /g,writeAnchorTag);
-   */
   text = text.replace(/(\[((?:\[[^\]]*]|[^\[\]])*)]\([ \t]*()<?(.*?(?:\(.*?\).*?)?)>?[ \t]*((['"])(.*?)\6[ \t]*)?\))/g,
                       writeAnchorTag);
 
-  //
   // Last, handle reference-style shortcuts: [link text]
   // These must come last in case you've also got [link test][1]
   // or [link test](/foo)
-  //
-
-  /*
-   text = text.replace(/
-   (                // wrap whole match in $1
-   \[
-   ([^\[\]]+)       // link text = $2; can't contain '[' or ']'
-   \]
-   )()()()()()      // pad rest of backreferences
-   /g, writeAnchorTag);
-   */
   text = text.replace(/(\[([^\[\]]+)])()()()()()/g, writeAnchorTag);
 
   text = globals.converter._dispatch('anchors.after', text, options, globals);

dist/showdown.js.map

@@ -5,7 +5,7 @@ showdown.subParser('autoLinks', function (text, options, globals) {
 
   var simpleURLRegex  = /\b(((https?|ftp|dict):\/\/|www\.)[^'">\s]+\.[^'">\s]+)(?=\s|$)(?!["<>])/gi,
       delimUrlRegex   = /<(((https?|ftp|dict):\/\/|www\.)[^'">\s]+)>/gi,
-      simpleMailRegex = /(?:^|[ \n\t])([A-Za-z0-9!#$%&'*+-/=?^_`\{|}~\.]+@[-a-z0-9]+(\.[-a-z0-9]+)*\.[a-z]+)(?:$|[ \n\t])/gi,
+      simpleMailRegex = /(?:^|\s)([A-Za-z0-9!#$%&'*+-/=?^_`\{|}~\.]+@[-a-z0-9]+(\.[-a-z0-9]+)*\.[a-z]+)(?:$|\s)/gi,
       delimMailRegex  = /<(?:mailto:)?([-.\w]+@[-a-z0-9]+(\.[-a-z0-9]+)*\.[a-z]+)>/gi;
 
   text = text.replace(delimUrlRegex, replaceLink);

dist/showdown.min.js

@@ -2,20 +2,8 @@ showdown.subParser('blockQuotes', function (text, options, globals) {
   'use strict';
 
   text = globals.converter._dispatch('blockQuotes.before', text, options, globals);
-  /*
-   text = text.replace(/
-   (								// Wrap whole match in $1
-   (
-   ^[ \t]*>[ \t]?			// '>' at the start of a line
-   .+\n					// rest of the first line
-   (.+\n)*					// subsequent consecutive lines
-   \n*						// blanks
-   )+
-   )
-   /gm, function(){...});
-   */
-
-  text = text.replace(/((^[ \t]{0,3}>[ \t]?.+\n(.+\n)*\n*)+)/gm, function (wholeMatch, m1) {
+
+  text = text.replace(/((^ {0,3}>[ \t]?.+\n(.+\n)*\n*)+)/gm, function (wholeMatch, m1) {
     var bq = m1;
 
     // attacklab: hack around Konqueror 3.5.4 bug:

dist/showdown.min.js.map

@@ -5,20 +5,8 @@ showdown.subParser('codeBlocks', function (text, options, globals) {
   'use strict';
 
   text = globals.converter._dispatch('codeBlocks.before', text, options, globals);
-  /*
-   text = text.replace(text,
-   /(?:\n\n|^)
-   (								// $1 = the code block -- one or more lines, starting with a space/tab
-   (?:
-   (?:[ ]{4}|\t)			// Lines must start with a tab or a tab-width of spaces - attacklab: g_tab_width
-   .*\n+
-   )+
-   )
-   (\n*[ ]{0,3}[^ \t\n]|(?=~0))	// attacklab: g_tab_width
-   /g,function(){...});
-   */
-
-  // attacklab: sentinel workarounds for lack of \A and \Z, safari\khtml bug
+
+  // sentinel workarounds for lack of \A and \Z, safari\khtml bug
   text += '~0';
 
   var pattern = /(?:\n\n|^)((?:(?:[ ]{4}|\t).*\n+)+)(\n*[ ]{0,3}[^ \t\n]|(?=~0))/g;
@@ -42,7 +30,7 @@ showdown.subParser('codeBlocks', function (text, options, globals) {
     return showdown.subParser('hashBlock')(codeblock, options, globals) + nextChar;
   });
 
-  // attacklab: strip sentinel
+  // strip sentinel
   text = text.replace(/~0/, '');
 
   text = globals.converter._dispatch('codeBlocks.after', text, options, globals);