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Ruby On Rails in UA/Code Review, теоретические вопросы/Сравниваем два файла

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2008-06-10 07:03:14	Ответить
Ruslan Voloshin Адрес: odessa Сообщений: 1231 Регистр: 2007-03-13 его блог 40 сообщ.	Сравниваем два файла
	class File def File.same_contents(p1, p2) return false if File.exists?(p1) != File.exists?(p2) return true if !File.exists?(p1) return true if File.expand_path(p1) == File.expand_path(p2) return false if File.ftype(p1) != File.ftype(p2) \|\| File.size(p1) != File.size(p2) #--- open(p1) do \|f1\| open(p2) do \|f2\| blocksize = f1.lstat.blksize same = true while same && !f1.eof? && !f2.eof? same = f1.read(blocksize) == f2.read(blocksize) end return same end end end end #--- 1.upto(2) do \|i\| open("output#{i}", 'w') { \|f\| f << 'x' * 10000 } end File.same_contents('output1', 'output2') # => true open("output1", 'a') { \|f\| f << 'x' } open("output2", 'a') { \|f\| f << 'y' } File.same_contents('output1', 'output2') # => false File.same_contents('nosuchfile', 'output1') # => false File.same_contents('nosuchfile1', 'nosuchfile2') # => true #--- require 'rubygems' require 'diff/lcs/hunk' def diff_as_string(data_old, data_new, format=:unified, context_lines=3) #--- data_old = data_old.split(/\n/).map! { \|e\| e.chomp } data_new = data_new.split(/\n/).map! { \|e\| e.chomp } #--- output = "" diffs = Diff::LCS.diff(data_old, data_new) return output if diffs.empty? oldhunk = hunk = nil file_length_difference = 0 diffs.each do \|piece\| begin hunk = Diff::LCS::Hunk.new(data_old, data_new, piece, context_lines, file_length_difference) file_length_difference = hunk.file_length_difference next unless oldhunk # Hunks may overlap, which is why we need to be careful when our # diff includes lines of context. Otherwise, we might print # redundant lines. if (context_lines > 0) and hunk.overlaps?(oldhunk) hunk.unshift(oldhunk) else output << oldhunk.diff(format) end ensure oldhunk = hunk output << "\n" end end #Handle the last remaining hunk output << oldhunk.diff(format) << "\n" end #--- s1 = "This is line one.\nThis is line two.\nThis is line three.\n" s2 = "This is line 1.\nThis is line two.\nThis is line three.\n" + "This is line 4.\n" puts diff_as_string(s1, s2) # @@ -1,4 +1,5 @@ # -This is line one. # +This is line 1. # This is line two. # This is line three. # +This is line 4. #--- open('old_file', 'w') { \|f\| f << s1 } open('new_file', 'w') { \|f\| f << s2 } puts %x{diff old_file new_file} # 1c1 # < This is line one. # --- # > This is line 1. # 3a4 # > This is line 4. #--- ------------ Занимаюсь вебом и продвижением сайтов.
	diff, rubygems

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