1 files changed, 179 insertions, 0 deletions
diff --git a/lib/coderay/scanners/java.rb b/lib/coderay/scanners/java.rb
new file mode 100644
index 0000000..f24bdf8
--- /dev/null
+++ b/lib/coderay/scanners/java.rb
@@ -0,0 +1,179 @@
+module CodeRay
+module Scanners
+
+  class Java < Scanner
+
+    include Streamable
+    register_for :java
+    helper :builtin_types
+    
+    # TODO: Check this!
+    KEYWORDS = %w[
+      break case catch continue default do else
+      false finally for if instanceof new null
+      return switch throw true try typeof while
+      debugger export import package
+    ]
+    
+    MAGIC_VARIABLES = %w[ this super ]
+    TYPES = %w[
+      boolean byte char class interface double enum float String int long short void
+    ] << '[]'
+    DIRECTIVES = %w[
+      abstract extends final implements native private protected public
+      static strictfp synchronized threadsafe throws transient volatile
+    ]
+    
+    # Reserved for future use.
+    
+    IDENT_KIND = WordList.new(:ident).
+      add(KEYWORDS, :keyword).
+      add(MAGIC_VARIABLES, :local_variable).
+      add(TYPES, :type).
+      add(BuiltinTypes::List, :type).
+      add(DIRECTIVES, :directive)
+
+    ESCAPE = / [bfnrtv\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
+    REGEXP_ESCAPE =  / [bBdDsSwW] /x
+    STRING_CONTENT_PATTERN = {
+      "'" => /[^\\']+/,
+      '"' => /[^\\"]+/,
+      '/' => /[^\\\/]+/,
+    }
+    IDENT = /[a-zA-Z_][A-Za-z_0-9]*/
+    
+    def scan_tokens tokens, options
+
+      state = :initial
+      string_delimiter = nil
+      import_clause = class_name_follows = last_token_dot = false
+
+      until eos?
+
+        kind = nil
+        match = nil
+        
+        case state
+
+        when :initial
+
+          if match = scan(/ \s+ | \\\n /x)
+            tokens << [match, :space]
+            next
+          
+          elsif scan(%r! // [^\n\\]* (?: \\. [^\n\\]* )* | /\* (?: .*? \*/ | .* ) !mx)
+            kind = :comment
+          
+          elsif import_clause && scan(/ #{IDENT} (?: \. #{IDENT} )* /ox)
+            kind = :include
+          
+          elsif match = scan(/ #{IDENT} | \[\] /ox)
+            kind = IDENT_KIND[match]
+            if last_token_dot
+              kind = :ident
+            elsif class_name_follows
+              kind = :class
+              class_name_follows = false
+            else
+              import_clause = true if match == 'import'
+              class_name_follows = true if match == 'class'
+            end
+          
+          elsif scan(/ \.(?!\d) | [,?:(\[)\]}] | -- | \+\+ | && | \|\| | \*\*=? | [-+*\/%^~&|<>=!]=? | <<<?=? | >>>?=? /x)
+            kind = :operator
+          
+          elsif scan(/;/)
+            import_clause = false
+            kind = :operator
+          
+          elsif scan(/\{/)
+            class_name_follows = false
+            kind = :operator
+          
+          elsif check(/[\d.]/)
+            if scan(/0[xX][0-9A-Fa-f]+/)
+              kind = :hex
+            elsif scan(/(?>0[0-7]+)(?![89.eEfF])/)
+              kind = :oct
+            elsif scan(/\d+[fFdD]|\d*\.\d+(?:[eE][+-]?\d+)?[fFdD]?|\d+[eE][+-]?\d+[fFdD]?/)
+              kind = :float
+            elsif scan(/\d+[lL]?/)
+              kind = :integer
+            end
+
+          elsif match = scan(/["']/)
+            tokens << [:open, :string]
+            state = :string
+            string_delimiter = match
+            kind = :delimiter
+
+          elsif scan(/ @ #{IDENT} /ox)
+            kind = :annotation
+
+          else
+            getch
+            kind = :error
+
+          end
+
+        when :string, :regexp
+          if scan(STRING_CONTENT_PATTERN[string_delimiter])
+            kind = :content
+          elsif match = scan(/["'\/]/)
+            tokens << [match, :delimiter]
+            if state == :regexp
+              modifiers = scan(/[gim]+/)
+              tokens << [modifiers, :modifier] if modifiers && !modifiers.empty?
+            end
+            tokens << [:close, state]
+            string_delimiter = nil
+            state = :initial
+            next
+          elsif state == :string && (match = scan(/ \\ (?: #{ESCAPE} | #{UNICODE_ESCAPE} ) /mox))
+            if string_delimiter == "'" && !(match == "\\\\" || match == "\\'")
+              kind = :content
+            else
+              kind = :char
+            end
+          elsif state == :regexp && scan(/ \\ (?: #{ESCAPE} | #{REGEXP_ESCAPE} | #{UNICODE_ESCAPE} ) /mox)
+            kind = :char
+          elsif scan(/\\./m)
+            kind = :content
+          elsif scan(/ \\ | $ /x)
+            tokens << [:close, :delimiter]
+            kind = :error
+            state = :initial
+          else
+            raise_inspect "else case \" reached; %p not handled." % peek(1), tokens
+          end
+
+        else
+          raise_inspect 'Unknown state', tokens
+
+        end
+
+        match ||= matched
+        if $DEBUG and not kind
+          raise_inspect 'Error token %p in line %d' %
+            [[match, kind], line], tokens
+        end
+        raise_inspect 'Empty token', tokens unless match
+        
+        last_token_dot = match == '.'
+        
+        tokens << [match, kind]
+
+      end
+
+      if [:string, :regexp].include? state
+        tokens << [:close, state]
+      end
+
+      tokens
+    end
+
+  end
+
+end
+end