112 lines
2 KiB
Ruby
112 lines
2 KiB
Ruby
module Mutant
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# Class to create diffs from source code
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class Differ
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include Adamantium::Flat
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FORMAT = :unified
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CONTEXT_LINES = 3
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# Return source diff
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#
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# @return [String]
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#
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# @api private
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#
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def diff
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output = ''
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@diffs.each do |piece|
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hunk = Diff::LCS::Hunk.new(@old, @new, piece, CONTEXT_LINES, length_difference)
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output << hunk.diff(FORMAT)
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output << "\n"
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end
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output
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end
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memoize :diff
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# Return colorized source diff
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#
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# @return [String]
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#
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# @api private
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#
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def colorized_diff
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diff.lines.map do |line|
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self.class.colorize_line(line)
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end.join
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end
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memoize :colorized_diff
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private
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# Initialize differ object
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#
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# @param [String] old
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# @param [String] new
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#
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# @return [undefined]
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#
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# @api private
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#
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def initialize(old, new)
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@old, @new = lines(old), lines(new)
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@diffs = Diff::LCS.diff(@old, @new)
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end
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# Break up sorce into lines
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#
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# @param [String] source
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#
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# @return [Array<String>]
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#
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# @api private
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#
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def lines(source)
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self.class.lines(source)
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end
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# Return length difference
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#
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# @return [Fixnum]
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#
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# @api private
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#
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def length_difference
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@new.size - @old.size
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end
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# Break up source into lines
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#
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# @param [String] source
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#
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# @return [Array<String>]
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#
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# @api private
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#
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def self.lines(source)
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source.lines.map { |line| line.chomp }
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end
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# Return colorized diff line
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#
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# @param [String] line
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#
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# @return [String]
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# returns colorized line
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#
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# @api private
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#
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def self.colorize_line(line)
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case line[0].chr
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when '+'
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Color::GREEN
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when '-'
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Color::RED
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when '@'
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line[1].chr == '@' ? Color::BLUE : Color::NONE
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else
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Color::NONE
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end.format(line)
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end
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end # Differ
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end # Mutant
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