74 lines
1.7 KiB
Ruby
74 lines
1.7 KiB
Ruby
# frozen_string_literal: true
|
|
|
|
module Gitlab
|
|
module Diff
|
|
class CharDiff
|
|
include Gitlab::Utils::StrongMemoize
|
|
|
|
def initialize(old_string, new_string)
|
|
@old_string = old_string.to_s
|
|
@new_string = new_string.to_s
|
|
@changes = []
|
|
end
|
|
|
|
def generate_diff
|
|
@changes = diff_match_patch.diff_main(@old_string, @new_string)
|
|
diff_match_patch.diff_cleanupSemantic(@changes)
|
|
|
|
@changes
|
|
end
|
|
|
|
def changed_ranges(offset: 0)
|
|
old_diffs = []
|
|
new_diffs = []
|
|
new_pointer = old_pointer = offset
|
|
|
|
generate_diff.each do |(action, content)|
|
|
content_size = content.size
|
|
|
|
if action == :equal
|
|
new_pointer += content_size
|
|
old_pointer += content_size
|
|
end
|
|
|
|
if action == :delete
|
|
old_diffs << (old_pointer..(old_pointer + content_size - 1))
|
|
old_pointer += content_size
|
|
end
|
|
|
|
if action == :insert
|
|
new_diffs << (new_pointer..(new_pointer + content_size - 1))
|
|
new_pointer += content_size
|
|
end
|
|
end
|
|
|
|
[old_diffs, new_diffs]
|
|
end
|
|
|
|
def to_html
|
|
@changes.map do |op, text|
|
|
%{<span class="#{html_class_names(op)}">#{ERB::Util.html_escape(text)}</span>}
|
|
end.join.html_safe
|
|
end
|
|
|
|
private
|
|
|
|
def diff_match_patch
|
|
strong_memoize(:diff_match_patch) { DiffMatchPatch.new }
|
|
end
|
|
|
|
def html_class_names(operation)
|
|
class_names = ['idiff']
|
|
|
|
case operation
|
|
when :insert
|
|
class_names << 'addition'
|
|
when :delete
|
|
class_names << 'deletion'
|
|
end
|
|
|
|
class_names.join(' ')
|
|
end
|
|
end
|
|
end
|
|
end
|