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1 | 1 | # Redmine - project management software |
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2 | 2 | # Copyright (C) 2006-2013 Jean-Philippe Lang |
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3 | 3 | # |
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4 | 4 | # This program is free software; you can redistribute it and/or |
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5 | 5 | # modify it under the terms of the GNU General Public License |
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6 | 6 | # as published by the Free Software Foundation; either version 2 |
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7 | 7 | # of the License, or (at your option) any later version. |
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8 | 8 | # |
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9 | 9 | # This program is distributed in the hope that it will be useful, |
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10 | 10 | # but WITHOUT ANY WARRANTY; without even the implied warranty of |
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11 | 11 | # MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
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12 | 12 | # GNU General Public License for more details. |
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13 | 13 | # |
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14 | 14 | # You should have received a copy of the GNU General Public License |
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15 | 15 | # along with this program; if not, write to the Free Software |
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16 | 16 | # Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA. |
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17 | 17 | |
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18 | require 'diff' | |
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19 | ||
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18 | 20 | module Redmine |
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19 | 21 | module Helpers |
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20 | 22 | class Diff |
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21 | 23 | include ERB::Util |
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22 | 24 | include ActionView::Helpers::TagHelper |
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23 | 25 | include ActionView::Helpers::TextHelper |
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24 | 26 | attr_reader :diff, :words |
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25 | 27 | |
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26 | 28 | def initialize(content_to, content_from) |
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27 | 29 | @words = content_to.to_s.split(/(\s+)/) |
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28 | 30 | @words = @words.select {|word| word != ' '} |
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29 | 31 | words_from = content_from.to_s.split(/(\s+)/) |
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30 | 32 | words_from = words_from.select {|word| word != ' '} |
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31 | 33 | @diff = words_from.diff @words |
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32 | 34 | end |
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33 | 35 | |
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34 | 36 | def to_html |
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35 | 37 | words = self.words.collect{|word| h(word)} |
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36 | 38 | words_add = 0 |
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37 | 39 | words_del = 0 |
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38 | 40 | dels = 0 |
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39 | 41 | del_off = 0 |
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40 | 42 | diff.diffs.each do |diff| |
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41 | 43 | add_at = nil |
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42 | 44 | add_to = nil |
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43 | 45 | del_at = nil |
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44 | 46 | deleted = "" |
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45 | 47 | diff.each do |change| |
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46 | 48 | pos = change[1] |
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47 | 49 | if change[0] == "+" |
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48 | 50 | add_at = pos + dels unless add_at |
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49 | 51 | add_to = pos + dels |
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50 | 52 | words_add += 1 |
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51 | 53 | else |
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52 | 54 | del_at = pos unless del_at |
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53 | 55 | deleted << ' ' unless deleted.empty? |
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54 | 56 | deleted << h(change[2]) |
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55 | 57 | words_del += 1 |
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56 | 58 | end |
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57 | 59 | end |
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58 | 60 | if add_at |
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59 | 61 | words[add_at] = '<span class="diff_in">'.html_safe + words[add_at] |
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60 | 62 | words[add_to] = words[add_to] + '</span>'.html_safe |
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61 | 63 | end |
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62 | 64 | if del_at |
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63 | 65 | words.insert del_at - del_off + dels + words_add, '<span class="diff_out">'.html_safe + deleted + '</span>'.html_safe |
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64 | 66 | dels += 1 |
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65 | 67 | del_off += words_del |
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66 | 68 | words_del = 0 |
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67 | 69 | end |
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68 | 70 | end |
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69 | 71 | words.join(' ').html_safe |
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70 | 72 | end |
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71 | 73 | end |
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72 | 74 | end |
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73 | 75 | end |
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