Coderay upgraded to 0.9.7 (#5344).

git-svn-id: svn+ssh://rubyforge.org/var/svn/redmine/trunk@4739 e93f8b46-1217-0410-a6f0-8f06a7374b81

vendor/gems/coderay-0.9.7/lib/coderay/scanners/c.rb

@@ -0,0 +1,203 @@
+module CodeRay
+module Scanners
+
+  class C < Scanner
+
+    include Streamable
+    
+    register_for :c
+    file_extension 'c'
+
+    RESERVED_WORDS = [
+      'asm', 'break', 'case', 'continue', 'default', 'do',
+      'else', 'enum', 'for', 'goto', 'if', 'return',
+      'sizeof', 'struct', 'switch', 'typedef', 'union', 'while',
+      'restrict',  # added in C99
+    ]
+
+    PREDEFINED_TYPES = [
+      'int', 'long', 'short', 'char',
+      'signed', 'unsigned', 'float', 'double',
+      'bool', 'complex',  # added in C99
+    ]
+
+    PREDEFINED_CONSTANTS = [
+      'EOF', 'NULL',
+      'true', 'false',  # added in C99
+    ]
+    DIRECTIVES = [
+      'auto', 'extern', 'register', 'static', 'void',
+      'const', 'volatile',  # added in C89
+      'inline',  # added in C99
+    ]
+
+    IDENT_KIND = WordList.new(:ident).
+      add(RESERVED_WORDS, :reserved).
+      add(PREDEFINED_TYPES, :pre_type).
+      add(DIRECTIVES, :directive).
+      add(PREDEFINED_CONSTANTS, :pre_constant)
+
+    ESCAPE = / [rbfntv\n\\'"] | x[a-fA-F0-9]{1,2} | [0-7]{1,3} /x
+    UNICODE_ESCAPE =  / u[a-fA-F0-9]{4} | U[a-fA-F0-9]{8} /x
+
+    def scan_tokens tokens, options
+
+      state = :initial
+      label_expected = true
+      case_expected = false
+      label_expected_before_preproc_line = nil
+      in_preproc_line = false
+
+      until eos?
+
+        kind = nil
+        match = nil
+        
+        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
+            tokens << [match, :space]
+            next
+
+          elsif scan(%r! // [^\n\\]* (?: \\. [^\n\\]* )* | /\* (?: .*? \*/ | .* ) !mx)
+            kind = :comment
+
+          elsif match = scan(/ \# \s* if \s* 0 /x)
+            match << scan_until(/ ^\# (?:elif|else|endif) .*? $ | \z /xm) unless eos?
+            kind = :comment
+
+          elsif match = scan(/ [-+*=<>?:;,!&^|()\[\]{}~%]+ | \/=? | \.(?!\d) /x)
+            label_expected = match =~ /[;\{\}]/
+            if case_expected
+              label_expected = true if match == ':'
+              case_expected = false
+            end
+            kind = :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 == :reserved
+                case match
+                when 'case', 'default'
+                  case_expected = true
+                end
+              end
+            end
+
+          elsif scan(/\$/)
+            kind = :ident
+          
+          elsif match = scan(/L?"/)
+            tokens << [:open, :string]
+            if match[0] == ?L
+              tokens << ['L', :modifier]
+              match = '"'
+            end
+            state = :string
+            kind = :delimiter
+
+          elsif scan(/#[ \t]*(\w*)/)
+            kind = :preprocessor
+            in_preproc_line = true
+            label_expected_before_preproc_line = label_expected
+            state = :include_expected if self[1] == 'include'
+
+          elsif scan(/ L?' (?: [^\'\n\\] | \\ #{ESCAPE} )? '? /ox)
+            label_expected = false
+            kind = :char
+
+          elsif scan(/0[xX][0-9A-Fa-f]+/)
+            label_expected = false
+            kind = :hex
+
+          elsif scan(/(?:0[0-7]+)(?![89.eEfF])/)
+            label_expected = false
+            kind = :oct
+
+          elsif scan(/(?:\d+)(?![.eEfF])L?L?/)
+            label_expected = false
+            kind = :integer
+
+          elsif scan(/\d[fF]?|\d*\.\d+(?:[eE][+-]?\d+)?[fF]?|\d+[eE][+-]?\d+[fF]?/)
+            label_expected = false
+            kind = :float
+
+          else
+            getch
+            kind = :error
+
+          end
+
+        when :string
+          if scan(/[^\\\n"]+/)
+            kind = :content
+          elsif scan(/"/)
+            tokens << ['"', :delimiter]
+            tokens << [:close, :string]
+            state = :initial
+            label_expected = false
+            next
+          elsif scan(/ \\ (?: #{ESCAPE} | #{UNICODE_ESCAPE} ) /mox)
+            kind = :char
+          elsif scan(/ \\ | $ /x)
+            tokens << [:close, :string]
+            kind = :error
+            state = :initial
+            label_expected = false
+          else
+            raise_inspect "else case \" reached; %p not handled." % peek(1), tokens
+          end
+
+        when :include_expected
+          if scan(/<[^>\n]+>?|"[^"\n\\]*(?:\\.[^"\n\\]*)*"?/)
+            kind = :include
+            state = :initial
+
+          elsif match = scan(/\s+/)
+            kind = :space
+            state = :initial if match.index ?\n
+
+          else
+            state = :initial
+            next
+
+          end
+
+        else
+          raise_inspect 'Unknown state', tokens
+
+        end
+
+        match ||= matched
+        if $CODERAY_DEBUG and not kind
+          raise_inspect 'Error token %p in line %d' %
+            [[match, kind], line], tokens
+        end
+        raise_inspect 'Empty token', tokens unless match
+
+        tokens << [match, kind]
+
+      end
+
+      if state == :string
+        tokens << [:close, :string]
+      end
+
+      tokens
+    end
+
+  end
+
+end
+end