Object
A Hunk is a group of Blocks which overlap because of the context surrounding each block. (So if we're not using context, every hunk will contain one block.) Used in the diff program (bin/diff).
Change the "start" and "end" fields to note that context should be added to this hunk.
Create a hunk using references to both the old and new data, as well as the piece of data.
# File lib/diff/lcs/hunk.rb, line 10 def initialize(data_old, data_new, piece, flag_context, file_length_difference) # At first, a hunk will have just one Block in it @blocks = [ Diff::LCS::Block.new(piece) ] if String.method_defined?(:encoding) @preferred_data_encoding = data_old.fetch(0, data_new.fetch(0,'') ).encoding end @data_old = data_old @data_new = data_new before = after = file_length_difference after += @blocks[0].diff_size @file_length_difference = after # The caller must get this manually # Save the start & end of each array. If the array doesn't exist (e.g., # we're only adding items in this block), then figure out the line # number based on the line number of the other file and the current # difference in file lengths. if @blocks[0].remove.empty? a1 = a2 = nil else a1 = @blocks[0].remove[0].position a2 = @blocks[0].remove[-1].position end if @blocks[0].insert.empty? b1 = b2 = nil else b1 = @blocks[0].insert[0].position b2 = @blocks[0].insert[-1].position end @start_old = a1 || (b1 - before) @start_new = b1 || (a1 + before) @end_old = a2 || (b2 - after) @end_new = b2 || (a2 + after) self.flag_context = flag_context end
Returns a diff string based on a format.
# File lib/diff/lcs/hunk.rb, line 97 def diff(format) case format when :old old_diff when :unified unified_diff when :context context_diff when :ed self when :reverse_ed, :ed_finish ed_diff(format) else raise "Unknown diff format #{format}." end end
Merges this hunk and the provided hunk together if they overlap. Returns a truthy value so that if there is no overlap, you can know the merge was skipped.
# File lib/diff/lcs/hunk.rb, line 77 def merge(hunk) if overlaps?(hunk) @start_old = hunk.start_old @start_new = hunk.start_new blocks.unshift(*hunk.blocks) else nil end end
Determines whether there is an overlap between this hunk and the provided hunk. This will be true if the difference between the two hunks start or end positions is within one position of each other.
# File lib/diff/lcs/hunk.rb, line 91 def overlaps?(hunk) hunk and (((@start_old - hunk.end_old) <= 1) or ((@start_new - hunk.end_new) <= 1)) end
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