diff --git a/lib/coderay/scanners/io.rb b/lib/coderay/scanners/io.rb
new file mode 100644
index 00000000..22f50cc4
--- /dev/null
+++ b/lib/coderay/scanners/io.rb
@@ -0,0 +1,134 @@
+module CodeRay module Scanners
+
+	#A simple scanner for a simple language: Io
+
+	class Io < Scanner
+
+		register_for :io
+
+		RESERVED_WORDS = [ 'clone','init', 'method', 'list', 'vector', 'block',  'if','ifTrue','ifFalse','ifTrueIfFalse','then', 'for','loop',
+		'reverseForeach','foreach','map','continue','break','while','do','return',
+		'self','sender','target','proto','parent','protos']
+
+		PREDEFINED_TYPES = []
+
+		PREDEFINED_CONSTANTS = ['Object', 'Lobby',
+                'TRUE','true','FALSE','false','NULL','null','Null','Nil','nil','YES','NO']
+
+		IDENT_KIND = WordList.new(:ident).
+			add(RESERVED_WORDS, :reserved).
+			add(PREDEFINED_TYPES, :pre_type).
+			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
+
+			until eos?
+
+				kind = :error
+				match = nil
+
+				if state == :initial
+
+					if scan(/ \s+ | \\\n /x)
+						kind = :space
+
+					elsif scan(%r! // [^\n\\]* (?: \\. [^\n\\]* )* | /\* (?: .*? \*/ | .* ) !mx)
+						kind = :comment
+
+
+					elsif scan(/ [-+*\/\$\@=<>?:;,!&^|()\[\]{}~%]+ | \.(?!\d) /x)
+						kind = :operator
+
+					elsif match = scan(/ [A-Za-z_][A-Za-z_0-9]* /x)
+						kind = IDENT_KIND[match]
+						if kind == :ident and check(/:(?!:)/)
+							match << scan(/:/)
+							kind = :label
+						end
+
+					elsif match = scan(/L?"/)
+						tokens << [:open, :string]
+						if match[0] == ?L
+							tokens << ['L', :modifier]
+							match = '"'
+						end
+						state = :string
+						kind = :delimiter
+
+					elsif scan(/#\s*(\w*)/)
+						kind = :preprocessor  # FIXME multiline preprocs
+						state = :include_expected if self[1] == 'include'
+
+					elsif scan(/ L?' (?: [^\'\n\\] | \\ #{ESCAPE} )? '? /ox)
+						kind = :char
+
+					elsif scan(/0[xX][0-9A-Fa-f]+/)
+						kind = :hex
+
+					elsif scan(/(?:0[0-7]+)(?![89.eEfF])/)
+						kind = :oct
+
+					elsif scan(/(?:\d+)(?![.eEfF])/)
+						kind = :integer
+
+					elsif scan(/\d[fF]?|\d*\.\d+(?:[eE][+-]?\d+)?[fF]?|\d+[eE][+-]?\d+[fF]?/)
+						kind = :float
+
+					else
+						getch
+					end
+
+				elsif state == :string
+					if scan(/[^\\"]+/)
+						kind = :content
+					elsif scan(/"/)
+						tokens << ['"', :delimiter]
+						tokens << [:close, :string]
+						state = :initial
+						next
+					elsif scan(/ \\ (?: #{ESCAPE} | #{UNICODE_ESCAPE} ) /mox)
+						kind = :char
+					elsif scan(/ \\ | $ /x)
+						kind = :error
+						state = :initial
+					else
+						raise "else case \" reached; %p not handled." % peek(1), tokens
+					end
+
+				elsif state == :include_expected
+					if scan(/<[^>\n]+>?|"[^"\n\\]*(?:\\.[^"\n\\]*)*"?/)
+						kind = :include
+						state = :initial
+
+					elsif match = scan(/\s+/)
+						kind = :space
+						state = :initial if match.index ?\n
+
+					else
+						getch
+
+					end
+
+				else
+					raise 'else-case reached', tokens
+
+				end
+
+				match ||= matched
+				raise [match, kind], tokens if kind == :error
+
+				tokens << [match, kind]
+
+			end
+
+			tokens
+		end
+
+	end
+
+end end
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