Move unified diff parser out of the scm abstract adapter so it can be reused for viewing attached diffs (#1403).

git-svn-id: http://redmine.rubyforge.org/svn/trunk@1513 e93f8b46-1217-0410-a6f0-8f06a7374b81

1 files changed, 178 insertions, 0 deletions

diff --git a/lib/redmine/unified_diff.rb b/lib/redmine/unified_diff.rb
new file mode 100644
index 000000000..aa8994454
--- /dev/null
+++ b/lib/redmine/unified_diff.rb
@@ -0,0 +1,178 @@
+# redMine - project management software
+# Copyright (C) 2006-2008  Jean-Philippe Lang
+#
+# This program is free software; you can redistribute it and/or
+# modify it under the terms of the GNU General Public License
+# as published by the Free Software Foundation; either version 2
+# of the License, or (at your option) any later version.
+# 
+# This program is distributed in the hope that it will be useful,
+# but WITHOUT ANY WARRANTY; without even the implied warranty of
+# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+# GNU General Public License for more details.
+# 
+# You should have received a copy of the GNU General Public License
+# along with this program; if not, write to the Free Software
+# Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301, USA.
+
+module Redmine
+  # Class used to parse unified diffs
+  class UnifiedDiff < Array  
+    def initialize(diff, type="inline")
+      diff_table = DiffTable.new type
+      diff.each do |line|
+        if line =~ /^(---|\+\+\+) (.*)$/
+          self << diff_table if diff_table.length > 1
+          diff_table = DiffTable.new type
+        end
+        a = diff_table.add_line line
+      end
+      self << diff_table unless diff_table.empty?
+      self
+    end
+  end
+
+  # Class that represents a file diff
+  class DiffTable < Hash  
+    attr_reader :file_name, :line_num_l, :line_num_r    
+
+    # Initialize with a Diff file and the type of Diff View
+    # The type view must be inline or sbs (side_by_side)
+    def initialize(type="inline")
+      @parsing = false
+      @nb_line = 1
+      @start = false
+      @before = 'same'
+      @second = true
+      @type = type
+    end
+
+    # Function for add a line of this Diff
+    def add_line(line)
+      unless @parsing
+        if line =~ /^(---|\+\+\+) (.*)$/
+          @file_name = $2
+          return false
+        elsif line =~ /^@@ (\+|\-)(\d+)(,\d+)? (\+|\-)(\d+)(,\d+)? @@/
+          @line_num_l = $5.to_i
+          @line_num_r = $2.to_i
+          @parsing = true
+        end
+      else
+        if line =~ /^[^\+\-\s@\\]/
+          @parsing = false
+          return false
+        elsif line =~ /^@@ (\+|\-)(\d+)(,\d+)? (\+|\-)(\d+)(,\d+)? @@/
+          @line_num_l = $5.to_i
+          @line_num_r = $2.to_i
+        else
+          @nb_line += 1 if parse_line(line, @type)          
+        end
+      end
+      return true
+    end
+
+    def inspect
+      puts '### DIFF TABLE ###'
+      puts "file : #{file_name}"
+      self.each do |d|
+        d.inspect
+      end
+    end
+
+  private  
+    # Test if is a Side By Side type
+    def sbs?(type, func)
+      if @start and type == "sbs"
+        if @before == func and @second
+          tmp_nb_line = @nb_line
+          self[tmp_nb_line] = Diff.new
+        else
+            @second = false
+            tmp_nb_line = @start
+            @start += 1
+            @nb_line -= 1
+        end
+      else
+        tmp_nb_line = @nb_line
+        @start = @nb_line
+        self[tmp_nb_line] = Diff.new
+        @second = true
+      end
+      unless self[tmp_nb_line]
+        @nb_line += 1
+        self[tmp_nb_line] = Diff.new
+      else
+        self[tmp_nb_line]
+      end
+    end
+
+    # Escape the HTML for the diff
+    def escapeHTML(line)
+        CGI.escapeHTML(line)
+    end
+
+    def parse_line(line, type="inline")
+      if line[0, 1] == "+"
+        diff = sbs? type, 'add'
+        @before = 'add'
+        diff.line_left = escapeHTML line[1..-1]
+        diff.nb_line_left = @line_num_l
+        diff.type_diff_left = 'diff_in'
+        @line_num_l += 1
+        true
+      elsif line[0, 1] == "-"
+        diff = sbs? type, 'remove'
+        @before = 'remove'
+        diff.line_right = escapeHTML line[1..-1]
+        diff.nb_line_right = @line_num_r
+        diff.type_diff_right = 'diff_out'
+        @line_num_r += 1
+        true
+      elsif line[0, 1] =~ /\s/
+        @before = 'same'
+        @start = false
+        diff = Diff.new
+        diff.line_right = escapeHTML line[1..-1]
+        diff.nb_line_right = @line_num_r
+        diff.line_left = escapeHTML line[1..-1]
+        diff.nb_line_left = @line_num_l
+        self[@nb_line] = diff
+        @line_num_l += 1
+        @line_num_r += 1
+        true
+      elsif line[0, 1] = "\\"
+          true
+        else
+          false
+        end
+      end
+    end
+
+  # A line of diff
+  class Diff  
+    attr_accessor :nb_line_left
+    attr_accessor :line_left
+    attr_accessor :nb_line_right
+    attr_accessor :line_right
+    attr_accessor :type_diff_right
+    attr_accessor :type_diff_left
+    
+    def initialize()
+      self.nb_line_left = ''
+      self.nb_line_right = ''
+      self.line_left = ''
+      self.line_right = ''
+      self.type_diff_right = ''
+      self.type_diff_left = ''
+    end
+
+    def inspect
+      puts '### Start Line Diff ###'
+      puts self.nb_line_left
+      puts self.line_left
+      puts self.nb_line_right
+      puts self.line_right
+    end
+  end
+end