parser add this and braced expressions

Test/TestParser.hs

@@ -159,6 +159,16 @@ testExpressionPlusEqual = TestCase $
 testExpressionMinusEqual = TestCase $
     assertEqual "expect assign and subtraction" (StatementExpressionExpression (Assignment (Reference "a") (BinaryOperation Subtraction (Reference "a") (IntegerLiteral 5)))) $
     parseExpression [IDENTIFIER "a",MINUSEQUAL,INTEGERLITERAL 5]
+testExpressionThis = TestCase $
+    assertEqual "expect this" (Reference "this") $
+    parseExpression [THIS]
+testExpressionBraced = TestCase $
+    assertEqual "expect braced expresssion" (BinaryOperation Multiplication (Reference "b") (BinaryOperation Addition (Reference "a") (IntegerLiteral 3))) $
+    parseExpression [IDENTIFIER "b",TIMES,LBRACE,IDENTIFIER "a",PLUS,INTEGERLITERAL 3,RBRACE]
+
+testExpressionPrecedence = TestCase $
+    assertEqual "expect times to be inner expression" (BinaryOperation Addition (BinaryOperation Multiplication (Reference "b") (Reference "a")) (IntegerLiteral 3)) $
+    parseExpression [IDENTIFIER "b",TIMES,IDENTIFIER "a",PLUS,INTEGERLITERAL 3]
 
 testStatementIfThen = TestCase $
     assertEqual "expect empty ifthen" [If (Reference "a") (Block [Block []]) Nothing] $
@@ -218,6 +228,9 @@ tests = TestList [
     testExpressionDivideEqual,
     testExpressionPlusEqual,
     testExpressionMinusEqual,
+    testExpressionBraced,
+    testExpressionThis,
+    testExpressionPrecedence,
     testStatementIfThen,
     testStatementIfThenElse,
     testStatementWhile

src/Parser/JavaParser.y

@@ -316,8 +316,8 @@ inclusiveorexpression : exclusiveorexpression { $1 }
                  | inclusiveorexpression OR exclusiveorexpression { BinaryOperation Or $1 $3 }
 
 primarynonewarray : literal { $1 }
-                --  | THIS { }
-                --  | LBRACE expression RBRACE  { }
+                 | THIS { Reference "this" }
+                 | LBRACE expression RBRACE  { $2 }
                 --  | classinstancecreationexpression { }
                 --  | fieldaccess { }
                 --  | methodinvocation { }