Merge branch 'create-parser' of ssh://gitea.hb.dhbw-stuttgart.de:2222/MisterChaos69/MiniJavaCompiler into bytecode

Test/TestLexer.hs

@@ -4,14 +4,46 @@ import Test.HUnit
 import Parser.Lexer
 
 
-testCommentSomething = TestCase $ assertEqual "scan /*Something*/" [Comment "/*Something*/"] $ alexScanTokens "/*Something*/"
-testEmptyComment =  TestCase $ assertEqual "scan /*x*/"  [Comment "/**/"] $ alexScanTokens "/**/"
-testLineComment = TestCase $ assertEqual "scan // comment" [Comment "// comment"] $ alexScanTokens "// comment"
+emptyTokenList :: [Token]
+emptyTokenList = []
+testCommentSomething = TestCase $ assertEqual "scan '/*Something*/'" emptyTokenList $ alexScanTokens "/*Something*/"
+testEmptyComment =  TestCase $ assertEqual "scan '/*x*/'"  emptyTokenList $ alexScanTokens "/**/"
+testLineComment = TestCase $ assertEqual "scan '// comment'" emptyTokenList $ alexScanTokens "// comment"
+testLineCommentEnds = TestCase $ assertEqual "scan '// com\\n'" emptyTokenList $ alexScanTokens "// com\n"
 
+testIdentifier = TestCase $ assertEqual "scan 'identifier'" [IDENTIFIER "identifier"] $ alexScanTokens "identifier"
+testShortIdentifier = TestCase $ assertEqual "scan 'i'" [IDENTIFIER "i"] $ alexScanTokens "i"
+testIdentifierWithNumber = TestCase $ assertEqual "scan 'i2'" [IDENTIFIER "i2"] $ alexScanTokens "i2"
 
+testKeywordBreak = TestCase $ assertEqual "scan 'break'" [BREAK] $ alexScanTokens "break"
+testKeywordInt = TestCase $ assertEqual "scan 'int'" [INT] $ alexScanTokens "int"
+
+testIntLiteral = TestCase $ assertEqual "scan '234'" [INTEGERLITERAL 234] $ alexScanTokens "234"
+testIntLiteral2 = TestCase $ assertEqual "scan '54_2'" [INTEGERLITERAL 542] $ alexScanTokens "54_2"
+
+testCharLiteral = TestCase $ assertEqual "scan ''f''" [CHARLITERAL 'f'] $ alexScanTokens "'f'"
+
+testBoolLiteralTrue = TestCase $ assertEqual "scan 'true'" [BOOLLITERAL True] $ alexScanTokens "true"
+testBoolLiteralFalse = TestCase $ assertEqual "scan 'false'" [BOOLLITERAL False] $ alexScanTokens "false"
+
+testLBrace = TestCase $ assertEqual "scan '('" [LBRACE] $ alexScanTokens "("
+testAnd = TestCase $ assertEqual "scan '&&'" [AND] $ alexScanTokens "&&"
 
 tests = TestList [
     TestLabel "TestCommentSomething" testCommentSomething,
     TestLabel "TestEmptyComment" testEmptyComment,
-    TestLabel "TestLineComment" testLineComment
+    TestLabel "TestLineComment" testLineComment,
+    TestLabel "TestLineCommentEnds" testLineCommentEnds,
+    TestLabel "TestIdentifier" testIdentifier,
+    TestLabel "TestShortIdentifier" testShortIdentifier,
+    TestLabel "TestIdentifierWithNumber" testIdentifierWithNumber,
+    TestLabel "TestKeywordBreak" testKeywordBreak,
+    TestLabel "TestKeywordInt" testKeywordInt,
+    TestLabel "TestIntLiteral" testIntLiteral,
+    TestLabel "TestIntLiteral2" testIntLiteral2,
+    TestLabel "TestCharLiteral" testCharLiteral,
+    TestLabel "TestBoolLiteralTrue" testBoolLiteralTrue,
+    TestLabel "TestBoolLiteralFalse" testBoolLiteralFalse,
+    TestLabel "TestLBrace" testLBrace,
+    TestLabel "TestAnd" testAnd
     ]

Test/TestParser.hs

@@ -0,0 +1,28 @@
+module TestParser(tests) where
+
+import Test.HUnit
+import Parser.Lexer
+import Parser.JavaParser
+import Ast
+
+
+testSingleEmptyClass = TestCase $
+    assertEqual "expect single empty class hello" [Class "Hello" [] []] $
+    parse [CLASS, IDENTIFIER "Hello", LBRACKET, RBRACKET]
+testTwoEmptyClasses = TestCase $
+    assertEqual "expect two empty classes" [Class "Class1" [] [], Class "Class2" [] []] $
+    parse [CLASS,IDENTIFIER "Class1",LBRACKET,RBRACKET,CLASS,IDENTIFIER "Class2",LBRACKET,RBRACKET]
+testBooleanField = TestCase $
+    assertEqual "expect class with boolean field" [Class "WithBool" [] [VariableDeclaration "boolean" "value" Nothing]] $
+    parse [CLASS,IDENTIFIER "WithBool",LBRACKET,BOOLEAN,IDENTIFIER "value",SEMICOLON,RBRACKET]
+testIntField = TestCase $ 
+    assertEqual "expect class with int field" [Class "WithInt" [] [VariableDeclaration "int" "value" Nothing]] $
+    parse [CLASS,IDENTIFIER "WithInt",LBRACKET,INT,IDENTIFIER "value",SEMICOLON,RBRACKET]
+
+
+tests = TestList [
+    testSingleEmptyClass,
+    testTwoEmptyClasses,
+    testBooleanField,
+    testIntField
+    ]

Test/TestSuite.hs

@@ -3,9 +3,12 @@ module Main where
 import Test.HUnit
 import TestLexer
 import TestByteCodeGenerator
+import TestParser
 
-otherTest = TestCase $ assertEqual "math" (4+3) 7
 
-tests = TestList [TestLabel "TestLexer" TestLexer.tests, TestLabel "mathTest" otherTest, TestLabel "bytecodeTest" TestByteCodeGenerator.tests]
+tests = TestList [
+    TestLabel "TestLexer" TestLexer.tests,
+    TestLabel "TestParser" TestParser.tests,
+    TestLabel "TestByteCodeGenerator" TestByteCodeGenerator.tests]
 
 main = do runTestTTAndExit Main.tests

project.cabal

@@ -16,7 +16,15 @@ executable compiler
                         src/ByteCode,
                         src/ByteCode/ClassFile
     build-tool-depends: alex:alex, happy:happy
-    other-modules:      Ast, Example, Typecheck, ByteCode.ByteUtil, ByteCode.ClassFile, ByteCode.ClassFile.Generator, ByteCode.Constants
+    other-modules:      Parser.Lexer,
+                        Parser.JavaParser
+                        Ast,
+                        Example,
+                        Typecheck,
+                        ByteCode.ByteUtil,
+                        ByteCode.ClassFile,
+                        ByteCode.ClassFile.Generator,
+                        ByteCode.Constants
 
 test-suite tests
     type:               exitcode-stdio-1.0
@@ -28,4 +36,13 @@ test-suite tests
                         utf8-string,
                         bytestring
     build-tool-depends: alex:alex, happy:happy
-    other-modules:      TestLexer, TestByteCodeGenerator
+    other-modules:      Parser.Lexer,
+                        Parser.JavaParser,
+                        Ast,
+                        TestLexer,
+                        TestParser,
+                        TestByteCodeGenerator,
+                        ByteCode.ByteUtil,
+                        ByteCode.ClassFile,
+                        ByteCode.ClassFile.Generator,
+                        ByteCode.Constants

src/Parser/JavaParser.y

@@ -1,6 +1,6 @@
 {
 module Parser.JavaParser (parse) where
---import AbsSyn
+import Ast
 import Parser.Lexer
 }
 
@@ -15,9 +15,9 @@ import Parser.Lexer
         CHAR  { CHAR  }
         CLASS { CLASS}
         IDENTIFIER { IDENTIFIER $$ }
-        INTLITERAL { INTLITERAL $$}
+        INTLITERAL { INTEGERLITERAL $$}
         DOT { DOT }
-        MOD { MOD }
+        MOD { MODULO }
         TIMESEQUAL { TIMESEQUAL }
         GREATEREQUAL { GREATEREQUAL }
         WHILE { WHILE }
@@ -29,30 +29,29 @@ import Parser.Lexer
         THIS { THIS }
         STATIC { STATIC }
         PROTECTED { PROTECTED }
-        TILDE { TILDE }
-        MUL { MUL }
+        TILDE { BITWISENOT }
+        MUL { TIMES }
         MINUS { MINUS }
-        EXCLMARK { EXCLMARK }
+        EXCLMARK { NOT }
         IF { IF }
         ELSE { ELSE }
-        DIVIDEEQUAL { DIVIDEEQUAL }
+        DIVIDEEQUAL { DIVEQUAL }
         NEW { NEW }
         LBRACKET { LBRACKET }
-        JNULL { JNULL }
-        BOOLLITERAL { BOOLLITERAL }
+        JNULL { NULLLITERAL }
+        BOOLLITERAL { BOOLLITERAL $$ }
         DIV { DIV }
-        LOGICALOR { LOGICALOR }
+        LOGICALOR { OR }
         NOTEQUAL { NOTEQUAL }
         INSTANCEOF { INSTANCEOF }
         ANDEQUAL { ANDEQUAL }
         ASSIGN { ASSIGN }
         DECREMENT { DECREMENT }
-        STRINGLITERAL { STRINGLITERAL }
-        CHARLITERAL { CHARLITERAL }
+        CHARLITERAL { CHARLITERAL $$ }
         AND { AND }
         XOREQUAL { XOREQUAL }
         RETURN { RETURN }
-        QUESMARK { QUESMARK }
+        QUESMARK { QUESTIONMARK }
         SHIFTLEFTEQUAL { SHIFTLEFTEQUAL }
         RBRACKET { RBRACKET }
         COMMA { COMMA }
@@ -68,7 +67,7 @@ import Parser.Lexer
         INT { INT }
         ABSTRACT { ABSTRACT }
         SEMICOLON { SEMICOLON }
-        SIGNEDSHIFTRIGHTEQUAL { SIGNEDSHIFTRIGHTEQUAL }
+        SIGNEDSHIFTRIGHTEQUAL { SHIFTRIGHTEQUAL }
         UNSIGNEDSHIFTRIGHTEQUAL { UNSIGNEDSHIFTRIGHTEQUAL }
         PLUSEQUAL { PLUSEQUAL }
         OREQUAL { OREQUAL }
@@ -76,31 +75,39 @@ import Parser.Lexer
         LESS { LESS }
 %%
 
-compilationunit  : typedeclarations { }
+compilationunit  : typedeclarations { $1 }
 
-typedeclarations : typedeclaration { }
-		 | typedeclarations typedeclaration { }
+typedeclarations : typedeclaration { [$1] }
+                 | typedeclarations typedeclaration { $1 ++ [$2] }
 
 name             : qualifiedname { }
                  | simplename { }
 
-typedeclaration  : classdeclaration { }
+typedeclaration  : classdeclaration { $1 }
 
 qualifiedname    : name  DOT IDENTIFIER { }
 
 simplename       : IDENTIFIER { }
 
-classdeclaration : CLASS IDENTIFIER classbody { }
-                 | modifiers CLASS IDENTIFIER classbody { }
+classdeclaration : CLASS IDENTIFIER classbody { case $3 of (methods, fields) -> Class $2 methods fields }
+                --  | modifiers CLASS IDENTIFIER classbody { case $4 of (methods, fields) -> Class $3 methods fields }
 
 classbody        : LBRACKET RBRACKET  { ([], []) }
-		 | LBRACKET classbodydeclarations  RBRACKET { }
+                 | LBRACKET classbodydeclarations  RBRACKET { $2 }
 
 modifiers        : modifier { }
                  | modifiers modifier		 { }
 
-classbodydeclarations :  classbodydeclaration { }
-		 | classbodydeclarations classbodydeclaration{ }
+classbodydeclarations :  classbodydeclaration {
+                        case $1 of
+                        MethodDecl method -> ([method], [])
+                        FieldDecls fields -> ([], fields)
+                        }
+                --  | classbodydeclarations classbodydeclaration {
+                --         case ($1, $2) of
+                --         ((methods, fields), MethodDecl method) -> ((methods ++ [method]), fields)
+                --         ((methods, fields), FieldDecl field) -> (methods, (fields ++ [field]))
+                --         }
 
 modifier         : PUBLIC { }
                  | PROTECTED { }
@@ -110,19 +117,19 @@ modifier         : PUBLIC { }
 
 classtype        : classorinterfacetype{ }
 
-classbodydeclaration : classmemberdeclaration { }
-		 | constructordeclaration { }
+classbodydeclaration : classmemberdeclaration { $1 }
+                --  | constructordeclaration { FieldDecl $ VariableDeclaration "int" "a" Nothing }  -- TODO
 
 classorinterfacetype : name{ }
 
-classmemberdeclaration : fielddeclaration { }
-		 | methoddeclaration { }
+classmemberdeclaration : fielddeclaration { $1 }
+                --  | methoddeclaration { }
 
 constructordeclaration : constructordeclarator constructorbody { }
                  |  modifiers constructordeclarator constructorbody { }
 
-fielddeclaration : type variabledeclarators  SEMICOLON { }
- 		 | modifiers type variabledeclarators  SEMICOLON { }
+fielddeclaration : type variabledeclarators  SEMICOLON { FieldDecls $ map (convertDeclarator $1) $2 }
+                --   | modifiers type variabledeclarators  SEMICOLON {}
 
 methoddeclaration : methodheader methodbody { }
 
@@ -142,11 +149,11 @@ methodheader	 : type methoddeclarator { }
                  | VOID methoddeclarator { }
                  | modifiers VOID methoddeclarator { }
 
-type             : primitivetype { }
-		 | referencetype { }
+type             : primitivetype { $1 }
+                --  | referencetype { }
 
-variabledeclarators : variabledeclarator { }
-		 | variabledeclarators  COMMA  variabledeclarator { }
+variabledeclarators : variabledeclarator { [$1] }
+                --  | variabledeclarators  COMMA  variabledeclarator { $1 ++ [$3] }
 
 methodbody       : block { }
                  | SEMICOLON { }
@@ -166,14 +173,14 @@ classtypelist    : classtype { }
 methoddeclarator : IDENTIFIER LBRACE  RBRACE  { }
                  | IDENTIFIER LBRACE formalparameterlist  RBRACE  { }
 
-primitivetype    : BOOLEAN { }
-		 | numerictype { }
+primitivetype    : BOOLEAN { "boolean" }
+                 | numerictype { $1 }
 
 referencetype    : classorinterfacetype { }
 
 
-variabledeclarator : variabledeclaratorid { }
-		 | variabledeclaratorid ASSIGN variableinitializer { }
+variabledeclarator : variabledeclaratorid { Declarator $1 Nothing }
+                --  | variabledeclaratorid ASSIGN variableinitializer { Declarator $1 Nothing } -- TODO
 
 blockstatement         : localvariabledeclarationstatement { }
                  | statement  { }
@@ -183,9 +190,9 @@ formalparameter  : type variabledeclaratorid { }
 argumentlist     : expression { }
                  | argumentlist  COMMA  expression { }
 
-numerictype      : integraltype { }
+numerictype      : integraltype { $1 }
 
-variabledeclaratorid : IDENTIFIER { }
+variabledeclaratorid : IDENTIFIER { $1 }
 
 variableinitializer  : expression { }
 
@@ -199,8 +206,8 @@ statement        : statementwithouttrailingsubstatement{ }
 
 expression       : assignmentexpression { }
 
-integraltype     : INT  { }
-                 | CHAR { }
+integraltype     : INT  { "int" }
+                 | CHAR { "char" }
 
 localvariabledeclaration : type variabledeclarators { }
 
@@ -320,7 +327,6 @@ exclusiveorexpression : andexpression { }
 literal          : INTLITERAL { }
                  | BOOLLITERAL { }
                  | CHARLITERAL { }
-		 | STRINGLITERAL { }
                  | JNULL { }
 
 castexpression         : LBRACE  primitivetype  RBRACE  unaryexpression { }
@@ -354,7 +360,18 @@ multiplicativeexpression : unaryexpression { }
 
 {
 
+data MethodOrFieldDeclaration = MethodDecl MethodDeclaration
+                              | FieldDecls [VariableDeclaration]
+
+data Declarator = Declarator Identifier (Maybe Expression)
+
+-- convertDeclaratorList :: [DataType] -> MethodOrFieldDeclaration
+-- convertDeclaratorList = FieldDecls $ map 
+
+convertDeclarator :: DataType -> Declarator -> VariableDeclaration
+convertDeclarator dataType (Declarator id assigment) = VariableDeclaration dataType id assigment
+
 parseError :: [Token] -> a
-parseError _ = error "Parse error"
+parseError msg = error ("Parse error: " ++ show msg)
 
 }

src/Parser/Lexer.x

@@ -1,5 +1,6 @@
 {
 module Parser.Lexer(Token(..), alexScanTokens) where
+import Text.Read
 }
 
 %wrapper "basic"
@@ -7,18 +8,221 @@
 $digit = 0-9
 $alpha = [a-zA-Z]
 $alphanum = [a-zA-Z0-9]
+$JavaLetter = [A-Za-z\_\$]
+$JavaLetterOrDigit = [A-Za-z\_\$0-9]
 
 tokens :-
     $white ;
-    "/*"(.|\n)*"*/" { \s -> Comment s }
-    "//".* {\s -> Comment s}
-
+    "/*"(.|\n)*"*/" ;
+    "//".* ;
+    -- keywords
+    "abstract" { \_ -> ABSTRACT }
+    "assert" { \_ -> BOOLEAN }
+    "boolean" { \_ -> BOOLEAN}
+    "break" { \_ -> BREAK}
+    "byte" { \_ -> BYTE}
+    "case" { \_ -> CASE}
+    "catch" { \_ -> CATCH}
+    "char" { \_ -> CHAR}
+    "class" { \_ -> CLASS}
+    "const" { \_ -> CONST}
+    "continue" { \_ -> CONTINUE}
+    "default" { \_ -> DEFAULT}
+    "do" { \_ -> DO}
+    "double" { \_ -> DOUBLE}
+    ("else"|"ifn't") { \_ -> ELSE}
+    "enum" { \_ -> ENUM}
+    "extends" { \_ -> EXTENDS}
+    "final" { \_ -> FINAL}
+    "finally" { \_ -> FINALLY}
+    "float" { \_ -> FLOAT}
+    "for" { \_ -> FOR}
+    "if" { \_ -> IF}
+    "goto" { \_ -> GOTO}
+    "implements" { \_ -> IMPLEMENTS}
+    "import" { \_ -> IMPORT}
+    "instanceof" { \_ -> INSTANCEOF}
+    "int" { \_ -> INT}
+    "long" { \_ -> LONG}
+    "native" { \_ -> NATIVE}
+    "new" { \_ -> NEW}
+    "package" { \_ -> PACKAGE}
+    "private" { \_ -> PRIVATE}
+    "protected" { \_ -> PROTECTED}
+    "public" { \_ -> PUBLIC}
+    "return" { \_ -> RETURN}
+    "short" { \_ -> SHORT}
+    "static" { \_ -> STATIC}
+    "strictfp" { \_ -> STRICTFP}
+    "super" { \_ -> SUPER}
+    "switch" { \_ -> SWITCH}
+    "synchronized" { \_ -> SYNCHRONIZED}
+    "this" { \_ -> THIS}
+    "throw" { \_ -> THROW}
+    "throws" { \_ -> THROWS}
+    "transient" { \_ -> TRANSIENT}
+    "try" { \_ -> TRY}
+    "void" { \_ -> VOID}
+    "volatile" { \_ -> VOLATILE}
+    "while" { \_ -> WHILE}
+    -- Literals
+    "true" { \_ -> BOOLLITERAL True }
+    "false" { \_ -> BOOLLITERAL False }
+    "null" { \_ -> NULLLITERAL }
+    -- end keywords
+    $JavaLetter$JavaLetterOrDigit*  { \s -> IDENTIFIER s }
+    -- Literals
+    [1-9]([0-9\_]*[0-9])* { \s -> case readMaybe $ filter ((/=) '_') s of Just a -> INTEGERLITERAL a; Nothing -> error ("failed to parse INTLITERAL " ++ s) }
+    "'"."'" { \s -> case (s) of _ : c : _ -> CHARLITERAL c; _ -> error ("failed to parse CHARLITERAL " ++ s) }
+    -- separators
+    "(" { \_ -> LBRACE }
+    ")" { \_ -> RBRACE }
+    "{" { \_ -> LBRACKET }
+    "}" { \_ -> RBRACKET }
+    ";" { \_ -> SEMICOLON }
+    "," { \_ -> COMMA}
+    "." { \_ -> DOT }
+    -- operators
+    "=" { \_ -> ASSIGN }
+    "==" { \_ -> EQUAL }
+    "+" { \_ -> PLUS }
+    "+=" { \_ -> PLUSEQUAL }
+    ">" { \_ -> GREATER }
+    ">=" { \_ -> GREATEREQUAL }
+    "-" { \_ -> MINUS }
+    "-=" { \_ -> MINUSEQUAL }
+    "<" { \_ -> LESS }
+    "<=" { \_ -> LESSEQUAL }
+    "*" { \_ -> TIMES }
+    "*=" { \_ -> TIMESEQUAL }
+    "!" { \_ -> NOT }
+    "!=" { \_ -> NOTEQUAL }
+    "/" { \_ -> DIV }
+    "/=" { \_ -> DIVEQUAL }
+    "~" { \_ -> BITWISENOT }
+    "&&" { \_ -> AND }
+    "&" { \_ -> BITWISEAND }
+    "&=" { \_ -> ANDEQUAL }
+    "?" { \_ -> QUESTIONMARK }
+    "||" { \_ -> OR }
+    "|" { \_ -> BITWISEOR }
+    "|=" { \_ -> OREQUAL }
+    ":" { \_ -> COLON }
+    "++" { \_ -> INCREMENT }
+    "^" { \_ -> XOR }
+    "^=" { \_ -> XOREQUAL }
+    "--" { \_ -> DECREMENT }
+    "%" { \_ -> MODULO }
+    "%=" { \_ -> MODULOEQUAL }
+    "<<" { \_ -> SHIFTLEFT }
+    "<<=" { \_ -> SHIFTLEFTEQUAL }
+    ">>" { \_ -> SHIFTRIGHT }
+    ">>=" { \_ -> SHIFTRIGHTEQUAL }
+    ">>>" { \_ -> UNSIGNEDSHIFTRIGHT }
+    ">>>=" { \_ -> UNSIGNEDSHIFTRIGHTEQUAL }
 
 
 {
 data Token 
-    = Comment String
-    | Different
+    = ABSTRACT
+    | ASSERT
+    | BOOLEAN
+    | BREAK
+    | BYTE
+    | CASE
+    | CATCH
+    | CHAR
+    | CLASS
+    | CONST
+    | CONTINUE
+    | DEFAULT
+    | DO
+    | DOUBLE
+    | ELSE
+    | ENUM
+    | EXTENDS
+    | FINAL
+    | FINALLY
+    | FLOAT
+    | FOR
+    | IF
+    | GOTO
+    | IMPLEMENTS
+    | IMPORT
+    | INSTANCEOF
+    | INT
+    | INTERFACE
+    | LONG
+    | NATIVE
+    | NEW
+    | PACKAGE
+    | PRIVATE
+    | PROTECTED
+    | PUBLIC
+    | RETURN
+    | SHORT
+    | STATIC
+    | STRICTFP
+    | SUPER
+    | SWITCH
+    | SYNCHRONIZED
+    | THIS
+    | THROW
+    | THROWS
+    | TRANSIENT
+    | TRY
+    | VOID
+    | VOLATILE
+    | WHILE
+    | IDENTIFIER String
+    | INTEGERLITERAL Int
+    | CHARLITERAL Char
+    | BOOLLITERAL Bool
+    | NULLLITERAL
+    | LBRACE
+    | RBRACE
+    | LBRACKET
+    | RBRACKET
+    | SEMICOLON
+    | COMMA
+    | DOT
+    | ASSIGN
+    | EQUAL
+    | PLUS
+    | PLUSEQUAL
+    | GREATER
+    | GREATEREQUAL
+    | MINUS
+    | MINUSEQUAL
+    | LESS
+    | LESSEQUAL
+    | TIMES
+    | TIMESEQUAL
+    | NOT
+    | NOTEQUAL
+    | DIV
+    | DIVEQUAL
+    | BITWISENOT
+    | AND
+    | BITWISEAND
+    | ANDEQUAL
+    | QUESTIONMARK
+    | OR
+    | BITWISEOR
+    | OREQUAL
+    | COLON
+    | INCREMENT
+    | XOR
+    | XOREQUAL
+    | DECREMENT
+    | MODULO
+    | MODULOEQUAL
+    | SHIFTLEFT
+    | SHIFTLEFTEQUAL
+    | SHIFTRIGHT
+    | SHIFTRIGHTEQUAL
+    | UNSIGNEDSHIFTRIGHT
+    | UNSIGNEDSHIFTRIGHTEQUAL
     deriving(Eq,Show)
 
 }