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root / vendor / gems / coderay-0.9.7 / lib / coderay / scanners / diff.rb @ 442:753f1380d6bc

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module CodeRay
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module Scanners
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  class Diff < Scanner
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    register_for :diff
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    title 'diff output'
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    def scan_tokens tokens, options
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      line_kind = nil
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      state = :initial
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      until eos?
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        kind = match = nil
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        if match = scan(/\n/)
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          if line_kind
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            tokens << [:end_line, line_kind]
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            line_kind = nil
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          end
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          tokens << [match, :space]
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          next
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        end
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        case state
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        when :initial
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          if match = scan(/--- |\+\+\+ |=+|_+/)
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            tokens << [:begin_line, line_kind = :head]
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            tokens << [match, :head]
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            next unless match = scan(/.+/)
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            kind = :plain
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          elsif match = scan(/Index: |Property changes on: /)
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            tokens << [:begin_line, line_kind = :head]
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            tokens << [match, :head]
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            next unless match = scan(/.+/)
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            kind = :plain
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          elsif match = scan(/Added: /)
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            tokens << [:begin_line, line_kind = :head]
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            tokens << [match, :head]
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            next unless match = scan(/.+/)
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            kind = :plain
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            state = :added
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          elsif match = scan(/\\ /)
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            tokens << [:begin_line, line_kind = :change]
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            tokens << [match, :change]
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            next unless match = scan(/.+/)
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            kind = :plain
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          elsif match = scan(/@@(?>[^@\n]*)@@/)
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            if check(/\n|$/)
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              tokens << [:begin_line, line_kind = :change]
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            else
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              tokens << [:open, :change]
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            end
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            tokens << [match[0,2], :change]
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            tokens << [match[2...-2], :plain]
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            tokens << [match[-2,2], :change]
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            tokens << [:close, :change] unless line_kind
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            next unless match = scan(/.+/)
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            kind = :plain
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          elsif match = scan(/\+/)
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            tokens << [:begin_line, line_kind = :insert]
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            tokens << [match, :insert]
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            next unless match = scan(/.+/)
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            kind = :plain
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          elsif match = scan(/-/)
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            tokens << [:begin_line, line_kind = :delete]
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            tokens << [match, :delete]
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            next unless match = scan(/.+/)
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            kind = :plain
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          elsif scan(/ .*/)
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            kind = :comment
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          elsif scan(/.+/)
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            tokens << [:begin_line, line_kind = :comment]
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            kind = :plain
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          else
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            raise_inspect 'else case rached'
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          end
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        when :added
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          if match = scan(/   \+/)
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            tokens << [:begin_line, line_kind = :insert]
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            tokens << [match, :insert]
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            next unless match = scan(/.+/)
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            kind = :plain
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          else
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            state = :initial
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            next
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          end
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        end
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        match ||= matched
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        if $CODERAY_DEBUG and not kind
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          raise_inspect 'Error token %p in line %d' %
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            [[match, kind], line], tokens
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        end
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        raise_inspect 'Empty token', tokens unless match
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        tokens << [match, kind]
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      end
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      tokens << [:end_line, line_kind] if line_kind
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      tokens
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    end
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  end
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end
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end