From cecdb0b384d2f6943fab704497e67a744eb553f7 Mon Sep 17 00:00:00 2001
From: Valeriy Sizov <vsv2711@gmail.com>
Date: Mon, 2 Jul 2012 23:34:25 +0300
Subject: [PATCH] InlineDiff: refactoring

---
 app/helpers/commits_helper.rb | 53 +--------------------------
 lib/gitlab/inline_diff.rb     | 69 +++++++++++++++++++++++++++++++++++
 2 files changed, 71 insertions(+), 51 deletions(-)
 create mode 100644 lib/gitlab/inline_diff.rb

diff --git a/app/helpers/commits_helper.rb b/app/helpers/commits_helper.rb
index cbd2c969..fa87632d 100644
--- a/app/helpers/commits_helper.rb
+++ b/app/helpers/commits_helper.rb
@@ -36,8 +36,7 @@ module CommitsHelper
     line_new = 1
     type = nil
     
-    lines_arr = inline_diff diff_arr
-    #lines_arr = diff_arr
+    lines_arr = ::Gitlab::InlineDiff.processing diff_arr
     lines_arr.each do |line|
       next if line.match(/^\-\-\- \/dev\/null/)
       next if line.match(/^\+\+\+ \/dev\/null/)
@@ -45,9 +44,7 @@ module CommitsHelper
       next if line.match(/^\+\+\+ b/)
 
       full_line = html_escape(line.gsub(/\n/, ''))
-
-      full_line.gsub!("#!idiff-start!#", "<span class='idiff'>")
-      full_line.gsub!("#!idiff-finish!#", "</span>")
+      full_line = ::Gitlab::InlineDiff.replace_markers full_line
 
       if line.match(/^@@ -/)
         type = "match"
@@ -86,50 +83,4 @@ module CommitsHelper
     end
   end
 
-  def inline_diff diff_arr
-    chain_of_first_symbols = ""
-    diff_arr.each_with_index do |line, i|
-      chain_of_first_symbols += line[0]
-    end
-    chain_of_first_symbols.gsub!(/[^\-\+]/, "#")
-    
-    offset = 0
-    indexes = []
-    while index = chain_of_first_symbols.index("#-+#", offset)
-      indexes << index
-      offset = index + 1
-    end
-
-    indexes.each do |index|
-      first_line = diff_arr[index+1]
-      second_line = diff_arr[index+2]
-      max_length = [first_line.size, second_line.size].max
-      
-      first_the_same_symbols = 0
-      (0..max_length + 1).each do |i|
-        first_the_same_symbols = i - 1
-        if first_line[i] != second_line[i] && i > 0
-          break
-        end
-      end
-      first_token = first_line[0..first_the_same_symbols][1..-1]
-      
-      diff_arr[index+1].sub!(first_token, first_token + "#!idiff-start!#")
-      diff_arr[index+2].sub!(first_token, first_token + "#!idiff-start!#")
-      
-      last_the_same_symbols = 0
-      (1..max_length + 1).each do |i|
-        last_the_same_symbols = -i
-        if first_line[-i] != second_line[-i]
-          break
-        end
-      end
-      last_the_same_symbols += 1
-      last_token = first_line[last_the_same_symbols..-1]
-
-      diff_arr[index+1].sub!(/#{last_token}$/, "#!idiff-finish!#" + last_token)
-      diff_arr[index+2].sub!(/#{last_token}$/, "#!idiff-finish!#" + last_token)
-    end
-    diff_arr
-  end
 end
diff --git a/lib/gitlab/inline_diff.rb b/lib/gitlab/inline_diff.rb
new file mode 100644
index 00000000..b70abc22
--- /dev/null
+++ b/lib/gitlab/inline_diff.rb
@@ -0,0 +1,69 @@
+module Gitlab
+  class InlineDiff
+    class << self
+
+      START  = "#!idiff-start!#"
+      FINISH = "#!idiff-finish!#"
+    
+      def processing diff_arr
+        indexes = _indexes_of_changed_lines diff_arr
+
+        indexes.each do |index|
+          first_line = diff_arr[index+1]
+          second_line = diff_arr[index+2]
+          max_length = [first_line.size, second_line.size].max
+
+          first_the_same_symbols = 0
+          (0..max_length + 1).each do |i|
+            first_the_same_symbols = i - 1
+            if first_line[i] != second_line[i] && i > 0
+              break
+            end
+          end
+          first_token = first_line[0..first_the_same_symbols][1..-1]
+
+          diff_arr[index+1].sub!(first_token, first_token + START)
+          diff_arr[index+2].sub!(first_token, first_token + START)
+
+          last_the_same_symbols = 0
+          (1..max_length + 1).each do |i|
+            last_the_same_symbols = -i
+            if first_line[-i] != second_line[-i]
+              break
+            end
+          end
+          last_the_same_symbols += 1
+          last_token = first_line[last_the_same_symbols..-1]
+
+          diff_arr[index+1].sub!(/#{last_token}$/, FINISH + last_token)
+            diff_arr[index+2].sub!(/#{last_token}$/, FINISH + last_token)
+        end
+        diff_arr
+      end
+
+      def _indexes_of_changed_lines diff_arr
+        chain_of_first_symbols = ""
+        diff_arr.each_with_index do |line, i|
+          chain_of_first_symbols += line[0]
+        end
+        chain_of_first_symbols.gsub!(/[^\-\+]/, "#")
+
+        offset = 0
+        indexes = []
+        while index = chain_of_first_symbols.index("#-+#", offset)
+          indexes << index
+          offset = index + 1
+        end
+        indexes
+      end
+
+      def replace_markers line
+        line.gsub!(START, "<span class='idiff'>")
+        line.gsub!(FINISH, "</span>")
+        line
+      end
+    
+    end
+
+  end
+end