view vendor/gems/coderay-1.0.0/lib/coderay/scanners/c.rb @ 1082:997f6d7738f7 bug_531

In repo controller entry action, show the page for the file even if it's binary (so user still has access to history etc links). This makes it possible to use the entry action as the default when a file is clicked on

module CodeRay
module Scanners
  
  # Scanner for C.
  class C < Scanner

    register_for :c
    file_extension 'c'
    
    KEYWORDS = [
      'asm', 'break', 'case', 'continue', 'default', 'do',
      'else', 'enum', 'for', 'goto', 'if', 'return',
      'sizeof', 'struct', 'switch', 'typedef', 'union', 'while',
      'restrict',  # added in C99
    ]  # :nodoc:

    PREDEFINED_TYPES = [
      'int', 'long', 'short', 'char',
      'signed', 'unsigned', 'float', 'double',
      'bool', 'complex',  # added in C99
    ]  # :nodoc:

    PREDEFINED_CONSTANTS = [
      'EOF', 'NULL',
      'true', 'false',  # added in C99
    ]  # :nodoc:
    DIRECTIVES = [
      'auto', 'extern', 'register', 'static', 'void',
      'const', 'volatile',  # added in C89
      'inline',  # added in C99
    ]  # :nodoc:

    IDENT_KIND = WordList.new(:ident).
      add(KEYWORDS, :keyword).
      add(PREDEFINED_TYPES, :predefined_type).
      add(DIRECTIVES, :directive).
      add(PREDEFINED_CONSTANTS, :predefined_constant)  # :nodoc:

    ESCAPE = / [rbfntv\n\\'"] | x[a-fA-F0-9]{1,2} | [0-7]{1,3} /x  # :nodoc:
    UNICODE_ESCAPE =  / u[a-fA-F0-9]{4} | U[a-fA-F0-9]{8} /x  # :nodoc:
    
  protected
    
    def scan_tokens encoder, options

      state = :initial
      label_expected = true
      case_expected = false
      label_expected_before_preproc_line = nil
      in_preproc_line = false

      until eos?

        case state

        when :initial

          if match = scan(/ \s+ | \\\n /x)
            if in_preproc_line && match != "\\\n" && match.index(?\n)
              in_preproc_line = false
              label_expected = label_expected_before_preproc_line
            end
            encoder.text_token match, :space

          elsif match = scan(%r! // [^\n\\]* (?: \\. [^\n\\]* )* | /\* (?: .*? \*/ | .* ) !mx)
            encoder.text_token match, :comment

          elsif match = scan(/ [-+*=<>?:;,!&^|()\[\]{}~%]+ | \/=? | \.(?!\d) /x)
            label_expected = match =~ /[;\{\}]/
            if case_expected
              label_expected = true if match == ':'
              case_expected = false
            end
            encoder.text_token match, :operator

          elsif match = scan(/ [A-Za-z_][A-Za-z_0-9]* /x)
            kind = IDENT_KIND[match]
            if kind == :ident && label_expected && !in_preproc_line && scan(/:(?!:)/)
              kind = :label
              match << matched
            else
              label_expected = false
              if kind == :keyword
                case match
                when 'case', 'default'
                  case_expected = true
                end
              end
            end
            encoder.text_token match, kind

          elsif match = scan(/L?"/)
            encoder.begin_group :string
            if match[0] == ?L
              encoder.text_token 'L', :modifier
              match = '"'
            end
            encoder.text_token match, :delimiter
            state = :string

          elsif match = scan(/ \# \s* if \s* 0 /x)
            match << scan_until(/ ^\# (?:elif|else|endif) .*? $ | \z /xm) unless eos?
            encoder.text_token match, :comment

          elsif match = scan(/#[ \t]*(\w*)/)
            encoder.text_token match, :preprocessor
            in_preproc_line = true
            label_expected_before_preproc_line = label_expected
            state = :include_expected if self[1] == 'include'

          elsif match = scan(/ L?' (?: [^\'\n\\] | \\ #{ESCAPE} )? '? /ox)
            label_expected = false
            encoder.text_token match, :char

          elsif match = scan(/\$/)
            encoder.text_token match, :ident
          
          elsif match = scan(/0[xX][0-9A-Fa-f]+/)
            label_expected = false
            encoder.text_token match, :hex

          elsif match = scan(/(?:0[0-7]+)(?![89.eEfF])/)
            label_expected = false
            encoder.text_token match, :octal

          elsif match = scan(/(?:\d+)(?![.eEfF])L?L?/)
            label_expected = false
            encoder.text_token match, :integer

          elsif match = scan(/\d[fF]?|\d*\.\d+(?:[eE][+-]?\d+)?[fF]?|\d+[eE][+-]?\d+[fF]?/)
            label_expected = false
            encoder.text_token match, :float

          else
            encoder.text_token getch, :error

          end

        when :string
          if match = scan(/[^\\\n"]+/)
            encoder.text_token match, :content
          elsif match = scan(/"/)
            encoder.text_token match, :delimiter
            encoder.end_group :string
            state = :initial
            label_expected = false
          elsif match = scan(/ \\ (?: #{ESCAPE} | #{UNICODE_ESCAPE} ) /mox)
            encoder.text_token match, :char
          elsif match = scan(/ \\ | $ /x)
            encoder.end_group :string
            encoder.text_token match, :error
            state = :initial
            label_expected = false
          else
            raise_inspect "else case \" reached; %p not handled." % peek(1), encoder
          end

        when :include_expected
          if match = scan(/<[^>\n]+>?|"[^"\n\\]*(?:\\.[^"\n\\]*)*"?/)
            encoder.text_token match, :include
            state = :initial

          elsif match = scan(/\s+/)
            encoder.text_token match, :space
            state = :initial if match.index ?\n

          else
            state = :initial

          end

        else
          raise_inspect 'Unknown state', encoder

        end

      end

      if state == :string
        encoder.end_group :string
      end

      encoder
    end

  end

end
end