Refactoring and deleting unused code from lib/diffr.rb until I can understand what it says. Also fixes #256. The build is still broken.
This commit is contained in:
Alexey Verkhovsky
parent
60c07ca1a2
commit
3ea1ef881f
3
README
3
README
|
|
@ -50,7 +50,8 @@ to install (until somebody sends a patch to properly package Instiki for all tho
|
|||
* Internationalization: Wiki words in any latin, greek, cyrillian, or armenian characters
|
||||
* Color diffs: Track changes through revisions
|
||||
* Definitely can run on SQLite and MySQL
|
||||
* May be able to run on Postgres, Oracle, DB2 and SqlServer (if you try this )
|
||||
* May be able to run on Postgres, Oracle, DB2 and SqlServer. If you try this, and it works
|
||||
(or, it doesn't, but you make it work) please write about it on Instiki.org.
|
||||
|
||||
===Command-line options:
|
||||
* Run "ruby instiki --help"
|
||||
|
|
|
|||
650
lib/diff.rb
650
lib/diff.rb
|
|
@ -1,69 +1,199 @@
|
|||
# heavily based off difflib.py - see that file for documentation
|
||||
# ported from Python by Bill Atkins
|
||||
module HTMLDiff
|
||||
|
||||
# This does not support all features offered by difflib; it
|
||||
# implements only the subset of features necessary
|
||||
# to support a Ruby version of HTML Differ. You're welcome to finish this off.
|
||||
Match = Struct.new(:start_in_old, :start_in_new, :size)
|
||||
class Match
|
||||
def end_in_old
|
||||
self.start_in_old + self.size
|
||||
end
|
||||
|
||||
# By default, String#each iterates by line. This isn't really appropriate
|
||||
# for diff, so often a string will be split by // to get an array of one-
|
||||
# character strings.
|
||||
|
||||
# Some methods in Diff are untested and are not guaranteed to work. The
|
||||
# methods in HTMLDiff and any methods it calls should work quite well.
|
||||
|
||||
# changes by DenisMertz
|
||||
# * main change:
|
||||
# ** get the tag soup away
|
||||
# the tag soup problem was first reported with <p> tags, but it appeared also with
|
||||
# <li>, <ul> etc... tags
|
||||
# this version should mostly fix these problems
|
||||
# ** added a Builder class to manage the creation of the final htmldiff
|
||||
# * minor changes:
|
||||
# ** use symbols instead of string to represent opcodes
|
||||
# ** small fix to html2list
|
||||
#
|
||||
|
||||
module Enumerable
|
||||
def reduce(init)
|
||||
result = init
|
||||
each { |item| result = yield(result, item) }
|
||||
result
|
||||
def end_in_new
|
||||
self.start_in_new + self.size
|
||||
end
|
||||
end
|
||||
|
||||
class Object
|
||||
def nil_or_empty?
|
||||
nil? or empty?
|
||||
Operation = Struct.new(:action, :start_in_old, :end_in_old, :start_in_new, :end_in_new)
|
||||
|
||||
class DiffBuilder
|
||||
|
||||
def initialize(old_version, new_version)
|
||||
@old_version, @new_version = old_version, new_version
|
||||
@content = []
|
||||
end
|
||||
|
||||
def build
|
||||
split_inputs_to_words
|
||||
index_new_words
|
||||
operations.each {|opcode| perform_operation(opcode)}
|
||||
return @content.join
|
||||
end
|
||||
|
||||
def split_inputs_to_words
|
||||
@old_words = convert_html_to_list_of_words(explode(@old_version))
|
||||
@new_words = convert_html_to_list_of_words(explode(@new_version))
|
||||
end
|
||||
|
||||
def index_new_words
|
||||
@word_indices = {}
|
||||
@new_words.each_with_index { |word, i| (@word_indices[word] ||= []) << i }
|
||||
end
|
||||
|
||||
def operations
|
||||
position_in_old = position_in_new = 0
|
||||
operations = []
|
||||
matching_blocks.each do |match|
|
||||
match_starts_at_current_position_in_old = (position_in_old == match.start_in_old)
|
||||
match_starts_at_current_position_in_new = (position_in_new == match.start_in_new)
|
||||
|
||||
action_upto_match_positions =
|
||||
case [match_starts_at_current_position_in_old, match_starts_at_current_position_in_new]
|
||||
when [false, false]
|
||||
:replace
|
||||
when [true, false]
|
||||
:insert
|
||||
when [false, true]
|
||||
:delete
|
||||
else
|
||||
# this happens if the first few words are same in both versions
|
||||
:none
|
||||
end
|
||||
|
||||
if action_upto_match_positions != :none
|
||||
operation_upto_match_positions =
|
||||
Operation.new(action_upto_match_positions,
|
||||
position_in_old, match.start_in_old,
|
||||
position_in_new, match.start_in_new)
|
||||
operations << operation_upto_match_positions
|
||||
end
|
||||
match_operation = Operation.new(:equal,
|
||||
match.start_in_old, match.end_in_old,
|
||||
match.start_in_new, match.end_in_new)
|
||||
operations << match_operation
|
||||
|
||||
position_in_old = match.end_in_old
|
||||
position_in_new = match.end_in_new
|
||||
end
|
||||
operations
|
||||
end
|
||||
|
||||
def matching_blocks
|
||||
matching_blocks = []
|
||||
recursively_find_matching_blocks(0, @old_words.size, 0, @new_words.size, matching_blocks)
|
||||
matching_blocks
|
||||
end
|
||||
|
||||
def recursively_find_matching_blocks(start_in_old, end_in_old, start_in_new, end_in_new, matching_blocks)
|
||||
match = find_match(start_in_old, end_in_old, start_in_new, end_in_new)
|
||||
if match
|
||||
if start_in_old < match.start_in_old and start_in_new < match.start_in_new
|
||||
recursively_find_matching_blocks(
|
||||
start_in_old, match.start_in_old, start_in_new, match.start_in_new, matching_blocks)
|
||||
end
|
||||
matching_blocks << match
|
||||
if match.end_in_old < end_in_old and match.end_in_new < end_in_new
|
||||
recursively_find_matching_blocks(
|
||||
match.end_in_old, end_in_old, match.end_in_new, end_in_new, matching_blocks)
|
||||
end
|
||||
end
|
||||
end
|
||||
|
||||
module Diff
|
||||
def find_match(start_in_old, end_in_old, start_in_new, end_in_new)
|
||||
besti, bestj, bestsize = start_in_old, start_in_new, 0
|
||||
|
||||
j2len = {}
|
||||
|
||||
(start_in_old..end_in_old).step do |i|
|
||||
newj2len = {}
|
||||
(@word_indices[@old_words[i]] || []).each do |j|
|
||||
next if j < start_in_new
|
||||
break if j >= end_in_new
|
||||
|
||||
k = newj2len[j] = (j2len[j - 1] || 0) + 1
|
||||
if k > bestsize
|
||||
besti, bestj, bestsize = i - k + 1, j - k + 1, k
|
||||
end
|
||||
end
|
||||
j2len = newj2len
|
||||
end
|
||||
|
||||
while besti > start_in_old and bestj > start_in_new and @old_words[besti - 1] == @new_words[bestj - 1]
|
||||
besti, bestj, bestsize = besti - 1, bestj - 1, bestsize + 1
|
||||
end
|
||||
|
||||
while besti + bestsize < end_in_old and bestj + bestsize < end_in_new and
|
||||
@old_words[besti + bestsize] == @new_words[bestj + bestsize]
|
||||
bestsize += 1
|
||||
end
|
||||
|
||||
if bestsize == 0
|
||||
return nil
|
||||
else
|
||||
return Match.new(besti, bestj, bestsize)
|
||||
end
|
||||
end
|
||||
|
||||
VALID_METHODS = [:replace, :insert, :delete, :equal]
|
||||
def perform_operation(operation)
|
||||
@operation = operation
|
||||
self.send operation.action, operation
|
||||
end
|
||||
|
||||
def replace(operation)
|
||||
delete(operation, 'diffmod')
|
||||
insert(operation, 'diffmod')
|
||||
end
|
||||
|
||||
def insert(operation, tagclass = 'diffins')
|
||||
insert_tag('ins', tagclass, @new_words[operation.start_in_new...operation.end_in_new])
|
||||
end
|
||||
|
||||
def delete(operation, tagclass = 'diffdel')
|
||||
insert_tag('del', tagclass, @old_words[operation.start_in_old...operation.end_in_old])
|
||||
end
|
||||
|
||||
def equal(operation)
|
||||
# no tags to insert, simply copy the matching words from onbe of the versions
|
||||
@content += @new_words[operation.start_in_new...operation.end_in_new]
|
||||
end
|
||||
|
||||
def opening_tag?(item)
|
||||
item =~ %r!^\s*<[^>]+>\s*$!
|
||||
end
|
||||
|
||||
def closing_tag?(item)
|
||||
item =~ %r!^\s*</[^>]+>\s*$!
|
||||
end
|
||||
|
||||
def tag?(item)
|
||||
opening_tag?(item) or closing_tag?(item)
|
||||
end
|
||||
|
||||
# Tries to enclose diff tags (<ins> or <del>) within <p> tags
|
||||
# As a result the diff tags should be the "most inside" possible.
|
||||
def insert_tag(tagname, cssclass, words)
|
||||
unless words.any? { |word| tag?(word) }
|
||||
@content << wrap_text(words.join, tagname, cssclass)
|
||||
else
|
||||
loop do
|
||||
break if words.empty?
|
||||
@content << words and break if words.all? { |word| tag?(word) }
|
||||
# We are outside of a diff tag
|
||||
@content << words.shift while not words.empty? and tag?(words.first)
|
||||
@content << %(<#{tagname} class="#{cssclass}">)
|
||||
# We are inside a diff tag
|
||||
@content << words.shift until words.empty? or tag?(words.first)
|
||||
@content << %(</#{tagname}>)
|
||||
end
|
||||
end
|
||||
end
|
||||
|
||||
def wrap_text(text, tagname, cssclass)
|
||||
%(<#{tagname} class="#{cssclass}">#{text}</#{tagname}>)
|
||||
end
|
||||
|
||||
module Utilities
|
||||
def explode(sequence)
|
||||
sequence.is_a?(String) ? sequence.split(//) : sequence
|
||||
end
|
||||
|
||||
def newline?(char)
|
||||
%W(\n \r).include? char
|
||||
end
|
||||
|
||||
def tab?(char)
|
||||
"\t" == char
|
||||
end
|
||||
|
||||
# XXX Could be more robust but unrecognized tags cause an infinite loop so
|
||||
# better to be permissive
|
||||
def open_tag?(char)
|
||||
char =~ /\A<[^>]+>/
|
||||
end
|
||||
|
||||
# See comment for open_tag?
|
||||
def close_tag?(char)
|
||||
char =~ %r!\A</[^>]+>!
|
||||
end
|
||||
|
||||
def end_of_tag?(char)
|
||||
char == '>'
|
||||
end
|
||||
|
|
@ -72,408 +202,66 @@ module Diff
|
|||
char == '<'
|
||||
end
|
||||
|
||||
def html2list(x, use_brackets = false)
|
||||
def whitespace?(char)
|
||||
char =~ /\s/
|
||||
end
|
||||
|
||||
def convert_html_to_list_of_words(x, use_brackets = false)
|
||||
mode = :char
|
||||
cur = ''
|
||||
out = []
|
||||
current_word = ''
|
||||
words = []
|
||||
|
||||
explode(x).each do |char|
|
||||
case mode
|
||||
when :tag
|
||||
if end_of_tag? char
|
||||
cur += use_brackets ? ']' : '>'
|
||||
case cur
|
||||
when '<pre>' then mode = :pre
|
||||
when '<code>' then mode = :code
|
||||
current_word << (use_brackets ? ']' : '>')
|
||||
words << current_word
|
||||
current_word = ''
|
||||
if whitespace?(char)
|
||||
mode = :whitespace
|
||||
else
|
||||
out.push cur
|
||||
cur, mode = '', :char
|
||||
mode = :char
|
||||
end
|
||||
else
|
||||
cur += char
|
||||
current_word << char
|
||||
end
|
||||
when :char
|
||||
if start_of_tag? char
|
||||
out.push cur
|
||||
cur = use_brackets ? '[' : '<'
|
||||
words << current_word unless current_word.empty?
|
||||
current_word = (use_brackets ? '[' : '<')
|
||||
mode = :tag
|
||||
elsif /\s/.match char
|
||||
out.push cur + char
|
||||
cur = ''
|
||||
words << current_word unless current_word.empty?
|
||||
current_word = char
|
||||
mode = :whitespace
|
||||
else
|
||||
cur += char
|
||||
current_word << char
|
||||
end
|
||||
when :pre
|
||||
if end_of_tag?(char) and cur =~ %r!</pre$!
|
||||
cur += '>'
|
||||
out.push cur
|
||||
cur, mode = '', :char
|
||||
when :whitespace
|
||||
if start_of_tag? char
|
||||
words << current_word unless current_word.empty?
|
||||
current_word = (use_brackets ? '[' : '<')
|
||||
mode = :tag
|
||||
elsif /\s/.match char
|
||||
current_word << char
|
||||
else
|
||||
cur += char
|
||||
end
|
||||
when :code
|
||||
if end_of_tag?(char) and cur =~ %r!</code$!
|
||||
cur += '>'
|
||||
out.push cur
|
||||
cur, mode = '', :char
|
||||
else
|
||||
cur += char
|
||||
end
|
||||
end
|
||||
end
|
||||
|
||||
out.push(cur)
|
||||
out.delete ''
|
||||
out.map {|elt| newline?(elt) ? elt : elt.chomp}
|
||||
end
|
||||
end
|
||||
|
||||
class SequenceMatcher
|
||||
include Utilities
|
||||
|
||||
def initialize(a = [''], b = [''], isjunk = nil, byline = false)
|
||||
a, b = explode(a), explode(b) unless byline
|
||||
@isjunk = isjunk || Proc.new {}
|
||||
set_sequences a, b
|
||||
end
|
||||
|
||||
def set_sequences(a, b)
|
||||
set_sequence_a a
|
||||
set_sequence_b b
|
||||
end
|
||||
|
||||
def set_sequence_a(a)
|
||||
@a = a
|
||||
@matching_blocks = @opcodes = nil
|
||||
end
|
||||
|
||||
def set_sequence_b(b)
|
||||
@b = b
|
||||
@matching_blocks = @opcodes = nil
|
||||
chain_b
|
||||
end
|
||||
|
||||
def chain_b
|
||||
@fullbcount = nil
|
||||
@b2j = {}
|
||||
pophash = {}
|
||||
junkdict = {}
|
||||
|
||||
@b.each_with_index do |elt, idx|
|
||||
if @b2j.has_key? elt
|
||||
indices = @b2j[elt]
|
||||
if @b.length >= 200 and indices.length * 100 > @b.length
|
||||
pophash[elt] = 1
|
||||
indices.clear
|
||||
else
|
||||
indices.push idx
|
||||
words << current_word unless current_word.empty?
|
||||
current_word = char
|
||||
mode = :char
|
||||
end
|
||||
else
|
||||
@b2j[elt] = [idx]
|
||||
raise "Unknown mode #{mode.inspect}"
|
||||
end
|
||||
end
|
||||
words << current_word unless current_word.empty?
|
||||
words
|
||||
end
|
||||
|
||||
pophash.each_key { |elt| @b2j.delete elt }
|
||||
|
||||
unless @isjunk.nil?
|
||||
[pophash, @b2j].each do |d|
|
||||
d.each_key do |elt|
|
||||
if @isjunk.call(elt)
|
||||
junkdict[elt] = 1
|
||||
d.delete elt
|
||||
end
|
||||
end
|
||||
end
|
||||
end
|
||||
|
||||
@isbjunk = junkdict.method(:has_key?)
|
||||
@isbpopular = junkdict.method(:has_key?)
|
||||
end
|
||||
|
||||
def find_longest_match(a_low, a_high, b_low, b_high)
|
||||
besti, bestj, bestsize = a_low, b_low, 0
|
||||
|
||||
j2len = {}
|
||||
|
||||
(a_low..a_high).step do |i|
|
||||
newj2len = {}
|
||||
(@b2j[@a[i]] || []).each do |j|
|
||||
next if j < b_low
|
||||
break if j >= b_high
|
||||
|
||||
k = newj2len[j] = (j2len[j - 1] || 0) + 1
|
||||
if k > bestsize
|
||||
besti, bestj, bestsize = i - k + 1, j - k + 1, k
|
||||
end
|
||||
end
|
||||
j2len = newj2len
|
||||
end
|
||||
|
||||
while besti > a_low and bestj > b_low and not @isbjunk.call(@b[bestj - 1]) and @a[besti - 1] == @b[bestj - 1]
|
||||
besti, bestj, bestsize = besti - 1, bestj - 1, bestsize + 1
|
||||
end
|
||||
|
||||
while besti + bestsize < a_high and bestj + bestsize < b_high and
|
||||
not @isbjunk.call(@b[bestj + bestsize]) and
|
||||
@a[besti + bestsize] == @b[bestj + bestsize]
|
||||
bestsize += 1
|
||||
end
|
||||
|
||||
while besti > a_low and bestj > b_low and @isbjunk.call(@b[bestj - 1]) and @a[besti - 1] == @b[bestj - 1]
|
||||
besti, bestj, bestsize = besti - 1, bestj - 1, bestsize + 1
|
||||
end
|
||||
|
||||
while besti + bestsize < a_high and bestj + bestsize < b_high and @isbjunk.call(@b[bestj+bestsize]) and
|
||||
@a[besti+bestsize] == @b[bestj+bestsize]
|
||||
bestsize += 1
|
||||
end
|
||||
|
||||
[besti, bestj, bestsize]
|
||||
end
|
||||
|
||||
def get_matching_blocks
|
||||
return @matching_blocks unless @matching_blocks.nil_or_empty?
|
||||
|
||||
@matching_blocks = []
|
||||
size_of_a, size_of_b = @a.size, @b.size
|
||||
match_block_helper(0, size_of_a, 0, size_of_b, @matching_blocks)
|
||||
@matching_blocks.push [size_of_a, size_of_b, 0]
|
||||
end
|
||||
|
||||
def match_block_helper(a_low, a_high, b_low, b_high, answer)
|
||||
i, j, k = x = find_longest_match(a_low, a_high, b_low, b_high)
|
||||
unless k.zero?
|
||||
match_block_helper(a_low, i, b_low, j, answer) if a_low < i and b_low < j
|
||||
answer.push x
|
||||
if i + k < a_high and j + k < b_high
|
||||
match_block_helper(i + k, a_high, j + k, b_high, answer)
|
||||
end
|
||||
end
|
||||
end
|
||||
|
||||
def get_opcodes
|
||||
return @opcodes unless @opcodes.nil_or_empty?
|
||||
|
||||
i = j = 0
|
||||
@opcodes = answer = []
|
||||
get_matching_blocks.each do |ai, bj, size|
|
||||
tag = if i < ai and j < bj
|
||||
:replace
|
||||
elsif i < ai
|
||||
:delete
|
||||
elsif j < bj
|
||||
:insert
|
||||
end
|
||||
|
||||
answer.push [tag, i, ai, j, bj] if tag
|
||||
i, j = ai + size, bj + size
|
||||
answer.push [:equal, ai, i, bj, j] unless size.zero?
|
||||
end
|
||||
answer
|
||||
end
|
||||
|
||||
# XXX: untested
|
||||
def get_grouped_opcodes(n = 3)
|
||||
codes = get_opcodes
|
||||
if codes.first.first == :equal
|
||||
tag, i1, i2, j1, j2 = codes.first
|
||||
codes[0] = tag, [i1, i2 - n].max, i2, [j1, j2-n].max, j2
|
||||
end
|
||||
|
||||
if codes.last.first == :equal
|
||||
tag, i1, i2, j1, j2 = codes.last
|
||||
codes[-1] = tag, i1, min(i2, i1+n), j1, min(j2, j1+n)
|
||||
end
|
||||
|
||||
nn = n + n
|
||||
group = []
|
||||
codes.each do |tag, i1, i2, j1, j2|
|
||||
if tag == :equal and i2 - i1 > nn
|
||||
group.push [tag, i1, [i2, i1 + n].min, j1, [j2, j1 + n].min]
|
||||
yield group
|
||||
group = []
|
||||
i1, j1 = [i1, i2-n].max, [j1, j2-n].max
|
||||
group.push [tag, i1, i2, j1 ,j2]
|
||||
end
|
||||
end
|
||||
yield group if group and group.size != 1 and group.first.first == :equal
|
||||
end
|
||||
|
||||
def ratio
|
||||
matches = get_matching_blocks.reduce(0) do |sum, triple|
|
||||
sum + triple.last
|
||||
end
|
||||
Diff.calculate_ratio(matches, @a.size + @b.size)
|
||||
end
|
||||
|
||||
def quick_ratio
|
||||
if @fullbcount.nil_or_empty?
|
||||
@fullbcount = {}
|
||||
@b.each do |elt|
|
||||
@fullbcount[elt] = (@fullbcount[elt] || 0) + 1
|
||||
end
|
||||
end
|
||||
|
||||
avail = {}
|
||||
matches = 0
|
||||
@a.each do |elt|
|
||||
numb = avail.has_key?(elt) ? avail[elt] : (@fullbcount[elt] || 0)
|
||||
avail[elt] = numb - 1
|
||||
matches += 1 if numb > 0
|
||||
end
|
||||
Diff.calculate_ratio matches, @a.size + @b.size
|
||||
end
|
||||
|
||||
def real_quick_ratio
|
||||
size_of_a, size_of_b = @a.size, @b.size
|
||||
Diff.calculate_ratio([size_of_a, size_of_b].min, size_of_a + size_of_b)
|
||||
end
|
||||
|
||||
protected :chain_b, :match_block_helper
|
||||
end # end class SequenceMatcher
|
||||
|
||||
class << self
|
||||
def calculate_ratio(matches, length)
|
||||
return 1.0 if length.zero?
|
||||
2.0 * matches / length
|
||||
end
|
||||
|
||||
# XXX: untested
|
||||
def get_close_matches(word, possibilities, n = 3, cutoff = 0.6)
|
||||
raise "n must be > 0: #{n}" unless n > 0
|
||||
raise "cutoff must be in (0.0..1.0): #{cutoff}" unless cutoff.between 0.0..1.0
|
||||
|
||||
result = []
|
||||
sequence_matcher = Diff::SequenceMatcher.new
|
||||
sequence_matcher.set_sequence_b word
|
||||
possibilities.each do |possibility|
|
||||
sequence_matcher.set_sequence_a possibility
|
||||
if sequence_matcher.real_quick_ratio >= cutoff and
|
||||
sequence_matcher.quick_ratio >= cutoff and
|
||||
sequence_matcher.ratio >= cutoff
|
||||
result.push [sequence_matcher.ratio, possibility]
|
||||
end
|
||||
end
|
||||
|
||||
unless result.nil_or_empty?
|
||||
result.sort
|
||||
result.reverse!
|
||||
result = result[-n..-1]
|
||||
end
|
||||
result.map {|score, x| x }
|
||||
end
|
||||
|
||||
def count_leading(line, ch)
|
||||
count, size = 0, line.size
|
||||
count += 1 while count < size and line[count].chr == ch
|
||||
count
|
||||
end
|
||||
end
|
||||
end
|
||||
|
||||
module HTMLDiff
|
||||
include Diff
|
||||
class Builder
|
||||
VALID_METHODS = [:replace, :insert, :delete, :equal]
|
||||
def initialize(a, b)
|
||||
@a, @b = a, b
|
||||
@content = []
|
||||
end
|
||||
|
||||
def do_op(opcode)
|
||||
@opcode = opcode
|
||||
op = @opcode.first
|
||||
raise NameError, "Invalid opcode '#{op}'" unless VALID_METHODS.include? op
|
||||
send op
|
||||
end
|
||||
|
||||
def result
|
||||
@content.join
|
||||
end
|
||||
|
||||
# These methods have to be called via do_op(opcode) so that @opcode is set properly
|
||||
private
|
||||
|
||||
def replace
|
||||
delete('diffmod')
|
||||
insert('diffmod')
|
||||
end
|
||||
|
||||
def insert(tagclass = 'diffins')
|
||||
op_helper('ins', tagclass, @b[@opcode[3]...@opcode[4]])
|
||||
end
|
||||
|
||||
def delete(tagclass = 'diffdel')
|
||||
op_helper('del', tagclass, @a[@opcode[1]...@opcode[2]])
|
||||
end
|
||||
|
||||
def equal
|
||||
@content += @b[@opcode[3]...@opcode[4]]
|
||||
end
|
||||
|
||||
# Using this as op_helper would be equivalent to the first version of diff.rb by Bill Atkins
|
||||
def op_helper_simple(tagname, tagclass, to_add)
|
||||
@content << %(<#{tagname} class="#{tagclass}">) << to_add << %(</#{tagname}>)
|
||||
end
|
||||
|
||||
# Tries to put <p> tags or newline chars before the opening diff tags (<ins> or <del>)
|
||||
# or after the ending diff tags.
|
||||
# As a result the diff tags should be the "most inside" possible.
|
||||
def op_helper(tagname, tagclass, to_add)
|
||||
predicate_methods = [:tab?, :newline?, :close_tag?, :open_tag?]
|
||||
content_to_skip = Proc.new do |item|
|
||||
predicate_methods.any? {|predicate| HTMLDiff.send(predicate, item)}
|
||||
end
|
||||
|
||||
unless to_add.any? {|element| content_to_skip.call element}
|
||||
@content << wrap_text(to_add, tagname, tagclass)
|
||||
else
|
||||
loop do
|
||||
@content << to_add and break if to_add.all? {|element| content_to_skip.call element}
|
||||
# We are outside of a diff tag
|
||||
@content << to_add.shift while content_to_skip.call to_add.first
|
||||
@content << %(<#{tagname} class="#{tagclass}">)
|
||||
# We are inside a diff tag
|
||||
@content << to_add.shift until content_to_skip.call to_add.first
|
||||
@content << %(</#{tagname}>)
|
||||
end
|
||||
end
|
||||
#remove_empty_diff(tagname, tagclass)
|
||||
end
|
||||
|
||||
def wrap_text(text, tagname, tagclass)
|
||||
%(<#{tagname} class="#{tagclass}">#{text}</#{tagname}>)
|
||||
end
|
||||
|
||||
def remove_empty_diff(tagname, tagclass)
|
||||
@content = @content[0...-2] if last_elements_empty_diff?(@content, tagname, tagclass)
|
||||
end
|
||||
|
||||
def last_elements_empty_diff?(content, tagname, tagclass)
|
||||
content[-2] == %(<#{tagname} class="#{tagclass}">) and content.last == %(</#{tagname}>)
|
||||
end
|
||||
end
|
||||
|
||||
class << self
|
||||
include Diff::Utilities
|
||||
end # of class Diff Builder
|
||||
|
||||
def diff(a, b)
|
||||
a = html2list(explode(a))
|
||||
b = html2list(explode(b))
|
||||
|
||||
out = Builder.new(a, b)
|
||||
|
||||
sequence_matcher = Diff::SequenceMatcher.new(a, b)
|
||||
sequence_matcher.get_opcodes.each {|opcode| out.do_op(opcode)}
|
||||
out.result
|
||||
end
|
||||
end
|
||||
DiffBuilder.new(a, b).build
|
||||
end
|
||||
|
||||
if __FILE__ == $0
|
||||
if ARGV.size == 2
|
||||
puts HTMLDiff.diff(IO.read(ARGV.pop), IO.read(ARGV.pop))
|
||||
else
|
||||
puts "Usage: html_diff file1 file2"
|
||||
end
|
||||
end
|
||||
|
|
|
|||
|
|
@ -3,90 +3,91 @@
|
|||
require File.expand_path(File.dirname(__FILE__) + '/../test_helper')
|
||||
require 'diff'
|
||||
|
||||
include Diff
|
||||
|
||||
class DiffTest < Test::Unit::TestCase
|
||||
def test_init
|
||||
assert_nothing_raised {
|
||||
s = SequenceMatcher.new('private Thread currentThread;',
|
||||
'private volatile Thread currentThread;') { |x| x == ' ' }
|
||||
}
|
||||
|
||||
include HTMLDiff
|
||||
|
||||
def setup
|
||||
@builder = DiffBuilder.new('old', 'new')
|
||||
end
|
||||
|
||||
def test_matching_blocks
|
||||
s = SequenceMatcher.new 'abxcd', 'abcd'
|
||||
assert_equal [[0, 0, 2], [3, 2, 2], [5, 4, 0]], s.get_matching_blocks
|
||||
def test_start_of_tag
|
||||
assert @builder.start_of_tag?('<')
|
||||
assert(!@builder.start_of_tag?('>'))
|
||||
assert(!@builder.start_of_tag?('a'))
|
||||
end
|
||||
|
||||
def test_ratio
|
||||
s = SequenceMatcher.new 'abcd', 'bcde'
|
||||
assert_equal 0.75, s.ratio, 0.001
|
||||
assert_equal 0.75, s.quick_ratio, 0.001
|
||||
assert_equal 1.0, s.real_quick_ratio, 0.001
|
||||
def test_end_of_tag
|
||||
assert @builder.end_of_tag?('>')
|
||||
assert(!@builder.end_of_tag?('<'))
|
||||
assert(!@builder.end_of_tag?('a'))
|
||||
end
|
||||
|
||||
def test_longest_match
|
||||
s = SequenceMatcher.new(' abcd', 'abcd abcd')
|
||||
assert_equal [0, 4, 5], s.find_longest_match(0, 5, 0, 9)
|
||||
def test_whitespace
|
||||
assert @builder.whitespace?(" ")
|
||||
assert @builder.whitespace?("\n")
|
||||
assert @builder.whitespace?("\r")
|
||||
assert(!@builder.whitespace?("a"))
|
||||
end
|
||||
|
||||
def test_opcodes
|
||||
s = SequenceMatcher.new('qabxcd', 'abycdf')
|
||||
def test_convert_html_to_list_of_words_simple
|
||||
assert_equal(
|
||||
[
|
||||
[:delete, 0, 1, 0, 0],
|
||||
[:equal, 1, 3, 0, 2],
|
||||
[:replace, 3, 4, 2, 3],
|
||||
[:equal, 4, 6, 3, 5],
|
||||
[:insert, 6, 6, 5, 6]
|
||||
],
|
||||
s.get_opcodes)
|
||||
['the', ' ', 'original', ' ', 'text'],
|
||||
@builder.convert_html_to_list_of_words('the original text'))
|
||||
end
|
||||
|
||||
|
||||
def test_count_leading
|
||||
assert_equal 3, Diff.count_leading(' abc', ' ')
|
||||
end
|
||||
|
||||
def test_html2list
|
||||
a = "here is the original text"
|
||||
def test_convert_html_to_list_of_words_should_separate_endlines
|
||||
assert_equal(
|
||||
['here ', 'is ', 'the ', 'original ', 'text'],
|
||||
HTMLDiff.html2list(a))
|
||||
['a', "\n", 'b', "\r", 'c'],
|
||||
@builder.convert_html_to_list_of_words("a\nb\rc"))
|
||||
end
|
||||
|
||||
def test_html_diff
|
||||
def test_convert_html_to_list_of_words_should_not_compress_whitespace
|
||||
assert_equal(
|
||||
['a', ' ', 'b', ' ', 'c', "\r \n ", 'd'],
|
||||
@builder.convert_html_to_list_of_words("a b c\r \n d"))
|
||||
end
|
||||
|
||||
def test_convert_html_to_list_of_words_should_handle_tags_well
|
||||
assert_equal(
|
||||
['<p>', 'foo', ' ', 'bar', '</p>'],
|
||||
@builder.convert_html_to_list_of_words("<p>foo bar</p>"))
|
||||
end
|
||||
|
||||
def test_convert_html_to_list_of_words_interesting
|
||||
assert_equal(
|
||||
['<p>', 'this', ' ', 'is', '</p>', "\r\n", '<p>', 'the', ' ', 'new', ' ', 'string',
|
||||
'</p>', "\r\n", '<p>', 'around', ' ', 'the', ' ', 'world', '</p>'],
|
||||
@builder.convert_html_to_list_of_words(
|
||||
"<p>this is</p>\r\n<p>the new string</p>\r\n<p>around the world</p>"))
|
||||
end
|
||||
|
||||
def test_html_diff_simple
|
||||
a = 'this was the original string'
|
||||
b = 'this is the super string'
|
||||
assert_equal('this <del class="diffmod">was </del>' +
|
||||
'<ins class="diffmod">is </ins>the ' +
|
||||
'<del class="diffmod">original </del>' +
|
||||
'<ins class="diffmod">super </ins>string',
|
||||
HTMLDiff.diff(a, b))
|
||||
b = 'this is the new string'
|
||||
assert_equal('this <del class="diffmod">was</del><ins class="diffmod">is</ins> the ' +
|
||||
'<del class="diffmod">original</del><ins class="diffmod">new</ins> string',
|
||||
diff(a, b))
|
||||
end
|
||||
|
||||
def test_html_diff_with_multiple_paragraphs
|
||||
a = "<p>this was the original string</p>"
|
||||
b = "<p>this is</p>\r\n<p>the super string</p>\r\n<p>around the world</p>"
|
||||
|
||||
b = "<p>this is</p>\r\n<p>the new string</p>\r\n<p>around the world</p>"
|
||||
assert_equal(
|
||||
"<p>this <del class=\"diffmod\">was </del>" +
|
||||
"<ins class=\"diffmod\">is</ins></p>\r\n<p>the " +
|
||||
"<p>this <del class=\"diffmod\">was</del><ins class=\"diffmod\">is</ins></p>\r\n<p> the " +
|
||||
"<del class=\"diffmod\">original </del>" +
|
||||
"<ins class=\"diffmod\">super </ins>string</p>\r\n" +
|
||||
"<ins class=\"diffmod\">new </ins>string</p>\r\n" +
|
||||
"<p><ins class=\"diffins\">around the world</ins></p>",
|
||||
HTMLDiff.diff(a, b)
|
||||
)
|
||||
diff(a, b))
|
||||
end
|
||||
|
||||
# FIXME this test fails (ticket #67, http://dev.instiki.org/ticket/67)
|
||||
def test_html_diff_preserves_endlines_in_pre
|
||||
a = "<pre>\na\nb\nc\n</pre>"
|
||||
b = ''
|
||||
|
||||
b = "<pre>\n</pre>"
|
||||
assert_equal(
|
||||
"<pre>\n<del class=\"diffdel\">a\nb\nc\n</del></pre>",
|
||||
HTMLDiff.diff(a, b))
|
||||
diff(a, b))
|
||||
end
|
||||
|
||||
end
|
||||
|
|
|
|||
|
|
@ -266,8 +266,7 @@ class PageRendererTest < Test::Unit::TestCase
|
|||
:author => Author.new('DavidHeinemeierHansson'), :revised_at => Time.now)
|
||||
|
||||
assert_equal "<p>What a <del class=\"diffmod\">blue</del><ins class=\"diffmod\">red" +
|
||||
"</ins>and lovely <del class=\"diffmod\">morning</del><ins class=\"diffmod\">morning " +
|
||||
"today</ins></p>", test_renderer(@page.revisions.last).display_diff
|
||||
"</ins> and lovely morning<ins class=\"diffins\"> today</ins></p>", test_renderer(@page.revisions.last).display_diff
|
||||
end
|
||||
|
||||
def test_link_to_file
|
||||
|
|
|
|||
Loading…
Reference in a new issue