Redmine

module CodeRay

module Scanners

  # Scanner for C++.

  # 

  # Aliases: cs, csharp

  class CSharp < Scanner

    register_for :csharp

    file_extension 'cs'

    title 'C#'

    #-- http://www.cppreference.com/wiki/keywords/start

    KEYWORDS = [

      'as', 'break', 'case', 'catch', 'class', 'const', 'continue', 'default', 

      'delegate', 'do', 'else', 'enum', 'event', 'finally', 'get', 'for', 'foreach',

      'goto', 'if', 'in', 'interface', 'is', 'lock', 'namespace', 'new', 

      'operator', 'out', 'params', 'readonly', 'ref', 'return', 'set', 'sizeof',

      'stackalloc', 'struct', 'switch', 'throw', 'try', 'typeof', 'using', 'var',

      'while', 'yield'

    ]  # :nodoc:

    PREDEFINED_TYPES = [

      'bool', 'byte', 'char', 'decimal', 'double', 'float', 'int', 'long',

      'object', 'sbyte', 'short', 'string', 'uint', 'ulong', 'ushort'

    ]  # :nodoc:

    PREDEFINED_CONSTANTS = [

      'false', 'null', 'true'

    ]  # :nodoc:

    PREDEFINED_VARIABLES = [

      'base', 'this'

    ]  # :nodoc:

    DIRECTIVES = [

      'abstract', 'checked', 'explicit', 'extern', 'fixed', 'implicit', 'internal',

      'override', 'private', 'protected', 'public', 'sealed', 'static', 'unchecked',

      'unsafe', 'virtual', 'void', 'volatile'

    ]  # :nodoc:

    IDENT_KIND = WordList.new(:ident).

      add(KEYWORDS, :keyword).

      add(PREDEFINED_TYPES, :predefined_type).

      add(PREDEFINED_VARIABLES, :local_variable).

      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(/ \# \s* if \s* 0 /x)

            match << scan_until(/ ^\# (?:elif|else|endif) .*? $ | \z /xm) unless eos?

            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 'class', 'interface', 'struct'

                  state = :class_name_expected

                when 'case', 'default'

                  case_expected = true

                end

              end

            end

            encoder.text_token match, kind

          elsif match = scan(/\$/)

            encoder.text_token match, :ident

          elsif match = scan(/@?"/)

            encoder.begin_group :string

            state = :string

            encoder.text_token match, :delimiter

          elsif match = scan(/'/)

            encoder.begin_group :char

            state = :char

            encoder.text_token match, :delimiter

          elsif match = scan(/#[ \t]*(\w*)/)

            encoder.text_token match, :preprocessor

            in_preproc_line = true

            label_expected_before_preproc_line = label_expected

          elsif match = scan(/\d+[dDfFmM]|\d*\.\d+(?:[eE][+-]?\d+)?[dDfFmM]?|\d+[eE][+-]?\d+[dDfFmM]?/)

            label_expected = false

            encoder.text_token match, :float

          elsif match = scan(/0[xX][0-9A-Fa-f]+|[0-9]+(([uU][lL])|[lL])?/)

            label_expected = false

            encoder.text_token match, :integer

          else

            encoder.text_token getch, :error

          end

        when :string

          if match = scan(/[^\\"]+/)

            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 :char

          if match = scan(/[^\\'']+/)

            encoder.text_token match, :content

          elsif match = scan(/'/)

            encoder.text_token match, :delimiter

            encoder.end_group :char

            state = :initial

            label_expected = false

          elsif match = scan(/ \\ (?: #{ESCAPE} | #{UNICODE_ESCAPE} ) /mox)

            encoder.text_token match, :char

          elsif match = scan(/ \\ | $ /x)

            encoder.end_group :char

            encoder.text_token match, :error

            state = :initial

            label_expected = false

          else

            raise_inspect "else case \" reached; %p not handled." % peek(1), encoder

          end

        when :class_name_expected

          if match = scan(/ [A-Za-z_][A-Za-z_0-9]* /x)

            encoder.text_token match, :class

            state = :initial

          elsif match = scan(/\s+/)

            encoder.text_token match, :space

          else

            encoder.text_token getch, :error

            state = :initial

          end

        else

          raise_inspect 'Unknown state', encoder

        end

      end

      if state == :string

        encoder.end_group :string

      end

      encoder

    end

  end

end

end