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# -*- ruby encoding: utf-8 -*-
require 'rubygems'
require 'pathname'
file = Pathname.new(__FILE__).expand_path
path = file.parent
parent = path.parent
$:.unshift parent.join('lib')
require 'diff-lcs'
module Diff::LCS::SpecHelper
def seq1
%w(a b c e h j l m n p)
end
def skipped_seq1
%w(a h n p)
end
def seq2
%w(b c d e f j k l m r s t)
end
def skipped_seq2
%w(d f k r s t)
end
def word_sequence
%w(abcd efgh ijkl mnopqrstuvwxyz)
end
def correct_lcs
%w(b c e j l m)
end
def correct_forward_diff
[
[ [ '-', 0, 'a' ] ],
[ [ '+', 2, 'd' ] ],
[ [ '-', 4, 'h' ],
[ '+', 4, 'f' ] ],
[ [ '+', 6, 'k' ] ],
[ [ '-', 8, 'n' ],
[ '-', 9, 'p' ],
[ '+', 9, 'r' ],
[ '+', 10, 's' ],
[ '+', 11, 't' ] ]
]
end
def correct_backward_diff
[
[ [ '+', 0, 'a' ] ],
[ [ '-', 2, 'd' ] ],
[ [ '-', 4, 'f' ],
[ '+', 4, 'h' ] ],
[ [ '-', 6, 'k' ] ],
[
[ '-', 9, 'r' ],
[ '-', 10, 's' ],
[ '+', 8, 'n' ],
[ '-', 11, 't' ],
[ '+', 9, 'p' ] ]
]
end
def correct_forward_sdiff
[
[ '-', [ 0, 'a' ], [ 0, nil ] ],
[ '=', [ 1, 'b' ], [ 0, 'b' ] ],
[ '=', [ 2, 'c' ], [ 1, 'c' ] ],
[ '+', [ 3, nil ], [ 2, 'd' ] ],
[ '=', [ 3, 'e' ], [ 3, 'e' ] ],
[ '!', [ 4, 'h' ], [ 4, 'f' ] ],
[ '=', [ 5, 'j' ], [ 5, 'j' ] ],
[ '+', [ 6, nil ], [ 6, 'k' ] ],
[ '=', [ 6, 'l' ], [ 7, 'l' ] ],
[ '=', [ 7, 'm' ], [ 8, 'm' ] ],
[ '!', [ 8, 'n' ], [ 9, 'r' ] ],
[ '!', [ 9, 'p' ], [ 10, 's' ] ],
[ '+', [ 10, nil ], [ 11, 't' ] ]
]
end
def reverse_sdiff(forward_sdiff)
forward_sdiff.map { |line|
line[1], line[2] = line[2], line[1]
case line[0]
when '-' then line[0] = '+'
when '+' then line[0] = '-'
end
line
}
end
def change_diff(diff)
map_diffs(diff, Diff::LCS::Change)
end
def context_diff(diff)
map_diffs(diff, Diff::LCS::ContextChange)
end
def format_diffs(diffs)
diffs.map do |e|
if e.kind_of?(Array)
e.map { |f| f.to_a.join }.join(", ")
else
e.to_a.join
end
end.join("\n")
end
def map_diffs(diffs, klass = Diff::LCS::ContextChange)
diffs.map do |chunks|
if klass == Diff::LCS::ContextChange
klass.from_a(chunks)
else
chunks.map { |changes| klass.from_a(changes) }
end
end
end
def balanced_traversal(s1, s2, callback_type)
callback = __send__(callback_type)
Diff::LCS.traverse_balanced(s1, s2, callback)
callback
end
def balanced_reverse(change_result)
new_result = []
change_result.each { |line|
line = [ line[0], line[2], line[1] ]
case line[0]
when '<'
line[0] = '>'
when '>'
line[0] = '<'
end
new_result << line
}
new_result.sort_by { |line| [ line[1], line[2] ] }
end
def map_to_no_change(change_result)
new_result = []
change_result.each { |line|
case line[0]
when '!'
new_result << [ '<', line[1], line[2] ]
new_result << [ '>', line[1] + 1, line[2] ]
else
new_result << line
end
}
new_result
end
def simple_callback
callbacks = Object.new
class << callbacks
attr_reader :matched_a
attr_reader :matched_b
attr_reader :discards_a
attr_reader :discards_b
attr_reader :done_a
attr_reader :done_b
def reset
@matched_a = []
@matched_b = []
@discards_a = []
@discards_b = []
@done_a = []
@done_b = []
end
def match(event)
@matched_a << event.old_element
@matched_b << event.new_element
end
def discard_b(event)
@discards_b << event.new_element
end
def discard_a(event)
@discards_a << event.old_element
end
def finished_a(event)
@done_a << [event.old_element, event.old_position,
event.new_element, event.new_position]
end
def finished_b(event)
p "called #finished_b"
@done_b << [event.old_element, event.old_position,
event.new_element, event.new_position]
end
end
callbacks.reset
callbacks
end
def simple_callback_no_finishers
simple = simple_callback
class << simple
undef :finished_a
undef :finished_b
end
simple
end
def balanced_callback
cb = Object.new
class << cb
attr_reader :result
def reset
@result = []
end
def match(event)
@result << [ "=", event.old_position, event.new_position ]
end
def discard_a(event)
@result << [ "<", event.old_position, event.new_position ]
end
def discard_b(event)
@result << [ ">", event.old_position, event.new_position ]
end
def change(event)
@result << [ "!", event.old_position, event.new_position ]
end
end
cb.reset
cb
end
def balanced_callback_no_change
balanced = balanced_callback
class << balanced
undef :change
end
balanced
end
module Matchers
extend RSpec::Matchers::DSL
matcher :be_nil_or_match_values do |ii, s1, s2|
match do |ee|
ee.should satisfy { |vee| vee.nil? || s1[ii] == s2[ee] }
end
end
matcher :correctly_map_sequence do |s1|
match do |actual|
actual.each_with_index { |ee, ii|
ee.should be_nil_or_match_values(ii, s1, @s2)
}
end
chain :to_other_sequence do |s2|
@s2 = s2
end
end
end
end
RSpec.configure do |conf|
conf.include Diff::LCS::SpecHelper
end
# vim: ft=ruby
|