From 6f345edbcfbf2770ccdfb70c2a157eaf0e2930dd Mon Sep 17 00:00:00 2001
From: John MacFarlane <jgm@berkeley.edu>
Date: Fri, 9 Jan 2015 21:38:41 -0800
Subject: Improved newline parsing efficiency.

Don't check for `\n` when we know we have one.
Gobble spaces after line break.
---
 js/lib/blocks.js  |  3 +--
 js/lib/inlines.js | 25 +++++++++++--------------
 2 files changed, 12 insertions(+), 16 deletions(-)

diff --git a/js/lib/blocks.js b/js/lib/blocks.js
index f948e8b..f965fd7 100644
--- a/js/lib/blocks.js
+++ b/js/lib/blocks.js
@@ -552,8 +552,7 @@ var finalize = function(block, line_number) {
 
     switch (block.t) {
     case 'Paragraph':
-        block.string_content = block.strings.join('\n').replace(/^ {2,}/m, '');
-        // delete block.strings;
+        block.string_content = block.strings.join('\n');
 
         // try parsing the beginning as link reference definitions:
         while (block.string_content.charCodeAt(0) === C_OPEN_BRACKET &&
diff --git a/js/lib/inlines.js b/js/lib/inlines.js
index adeac6c..f27a7e7 100644
--- a/js/lib/inlines.js
+++ b/js/lib/inlines.js
@@ -672,23 +672,20 @@ var parseString = function(block) {
 // line break; otherwise a soft line break.
 var parseNewline = function(block) {
     "use strict";
-    var m = this.match(/^\n/);
-    if (m) {
-        // check previous node for trailing spaces
-        var lastc = block.lastChild;
-        if (lastc && lastc.t === 'Text') {
-            var sps = / *$/.exec(lastc.literal)[0].length;
-            if (sps > 0) {
-                lastc.literal = lastc.literal.replace(/ *$/,'');
-            }
-            block.appendChild(new Node(sps >= 2 ? 'Hardbreak' : 'Softbreak'));
-        } else {
-            block.appendChild(new Node('Softbreak'));
+    this.pos += 1; // assume we're at a \n
+    // check previous node for trailing spaces
+    var lastc = block.lastChild;
+    if (lastc && lastc.t === 'Text') {
+        var sps = / *$/.exec(lastc.literal)[0].length;
+        if (sps > 0) {
+            lastc.literal = lastc.literal.replace(/ *$/,'');
         }
-        return true;
+        block.appendChild(new Node(sps >= 2 ? 'Hardbreak' : 'Softbreak'));
     } else {
-      return false;
+        block.appendChild(new Node('Softbreak'));
     }
+    this.match(/^ */); // gobble leading spaces in next line
+    return true;
 };
 
 // Attempt to parse a link reference, modifying refmap.
-- 
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