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# Redmine - project management software
# Copyright (C) 2006-2016 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.
require 'diff'
module Redmine
module Helpers
class Diff
include ERB::Util
include ActionView::Helpers::TagHelper
include ActionView::Helpers::TextHelper
attr_reader :diff, :words
def initialize(content_to, content_from)
@words = content_to.to_s.split(/(\s+)/)
@words = @words.select {|word| word != ' '}
words_from = content_from.to_s.split(/(\s+)/)
words_from = words_from.select {|word| word != ' '}
@diff = words_from.diff @words
end
def to_html
words = self.words.collect{|word| h(word)}
words_add = 0
words_del = 0
dels = 0
del_off = 0
diff.diffs.each do |diff|
add_at = nil
add_to = nil
del_at = nil
deleted = ""
diff.each do |change|
pos = change[1]
if change[0] == "+"
add_at = pos + dels unless add_at
add_to = pos + dels
words_add += 1
else
del_at = pos unless del_at
deleted << ' ' unless deleted.empty?
deleted << h(change[2])
words_del += 1
end
end
if add_at
words[add_at] = '<span class="diff_in">'.html_safe + words[add_at]
words[add_to] = words[add_to] + '</span>'.html_safe
end
if del_at
words.insert del_at - del_off + dels + words_add, '<span class="diff_out">'.html_safe + deleted + '</span>'.html_safe
dels += 1
del_off += words_del
words_del = 0
end
end
words.join(' ').html_safe
end
end
end
end
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