1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
|
require 'diff/lcs'
require 'cgi'
module HtmlWordDiff
TOKEN_REGEXP = /<[^>]*>|[[:space:]]+|[[:alnum:]]+|[^[:space:][:alnum:]<>]/
def self.inline(old_html, new_html)
html = +''
each_change(old_html, new_html) do |action, old_token, new_token|
case action
when '='
html << new_token
when '-'
html << wrap_removed(old_token)
when '+'
html << wrap_inserted(new_token)
when '!'
html << wrap_removed(old_token)
html << wrap_inserted(new_token)
end
end
html
end
def self.side_by_side(old_html, new_html)
old_out = +''
new_out = +''
each_change(old_html, new_html) do |action, old_token, new_token|
case action
when '='
old_out << old_token
new_out << new_token
when '-'
old_out << wrap_removed(old_token)
when '+'
new_out << wrap_inserted(new_token)
when '!'
old_out << wrap_removed(old_token)
new_out << wrap_inserted(new_token)
end
end
[old_out, new_out]
end
def self.each_change(old_html, new_html)
Diff::LCS.sdiff(tokenize(old_html), tokenize(new_html)).each do |change|
yield change.action, change.old_element, change.new_element
end
end
def self.tokenize(html)
html.to_s.scan(TOKEN_REGEXP)
end
def self.tag_token?(token)
token.to_s.match?(/\A<[^>]*>\z/)
end
def self.wrap_removed(token)
if tag_token?(token)
%(<del class="diff_structural" title="removed: #{CGI.escapeHTML(token)}">\u00b6</del>)
else
"<del>#{token}</del>"
end
end
def self.wrap_inserted(token)
if tag_token?(token)
%(<ins class="diff_structural" title="added: #{CGI.escapeHTML(token)}">\u00b6</ins>)
else
"<ins>#{token}</ins>"
end
end
end
|
