javacc.parser.java_1_5.jj Maven / Gradle / Ivy
/**
* Copyright © 2002 Sun Microsystems, Inc., 4150 Network Circle, Santa Clara,
* California 95054, U.S.A. All rights reserved. Sun Microsystems, Inc. has
* intellectual property rights relating to technology embodied in the product
* that is described in this document. In particular, and without limitation,
* these intellectual property rights may include one or more of the U.S.
* patents listed at http://www.sun.com/patents and one or more additional
* patents or pending patent applications in the U.S. and in other countries.
* U.S. Government Rights - Commercial software. Government users are subject
* to the Sun Microsystems, Inc. standard license agreement and applicable
* provisions of the FAR and its supplements. Use is subject to license terms.
* Sun, Sun Microsystems, the Sun logo and Java are trademarks or registered
* trademarks of Sun Microsystems, Inc. in the U.S. and other countries. This
* product is covered and controlled by U.S. Export Control laws and may be
* subject to the export or import laws in other countries. Nuclear, missile,
* chemical biological weapons or nuclear maritime end uses or end users,
* whether direct or indirect, are strictly prohibited. Export or reexport
* to countries subject to U.S. embargo or to entities identified on U.S.
* export exclusion lists, including, but not limited to, the denied persons
* and specially designated nationals lists is strictly prohibited.
*/
options {
LOOKAHEAD=1;
STATIC=false;
CACHE_TOKENS=true;
ERROR_REPORTING = true;
JAVA_UNICODE_ESCAPE=false;
UNICODE_INPUT=true;
DEBUG_PARSER=false;
DEBUG_LOOKAHEAD=false;
DEBUG_TOKEN_MANAGER=false;
}
PARSER_BEGIN(JavaParser)
package japa.parser;
import java.io.*;
import java.util.*;
import japa.parser.ast.*;
import japa.parser.ast.body.*;
import japa.parser.ast.expr.*;
import japa.parser.ast.stmt.*;
import japa.parser.ast.type.*;
/**
* Grammar to parse Java version 1.5
* @author Sreenivasa Viswanadha - Simplified and enhanced for 1.5
* @author J?lio Vilmar Gesser - bug fixes and added AST generation
*/
public final class JavaParser {
private static JavaParser parser;
public static CompilationUnit parse(InputStream in) throws ParseException {
if (parser == null) {
parser = new JavaParser(in);
} else {
parser.ReInit(in);
}
return parser.CompilationUnit();
}
public static CompilationUnit parse(File file) throws ParseException {
try {
FileInputStream in = new FileInputStream(file);
try {
return parse(in);
} finally {
in.close();
}
} catch (IOException e) {
throw new RuntimeException(e);
}
}
private List add(List list, Object obj) {
if (list == null) {
list = new LinkedList();
}
list.add(obj);
return list;
}
private class Modifier {
final int modifiers;
final List annotations;
public Modifier(int modifiers, List annotations) {
this.modifiers = modifiers;
this.annotations = annotations;
}
}
}
PARSER_END(JavaParser)
/* WHITE SPACE */
SKIP :
{
" "
| "\t"
| "\n"
| "\r"
| "\f"
}
/* COMMENTS */
MORE :
{
"//" : IN_SINGLE_LINE_COMMENT
|
<"/**" ~["/"]> { input_stream.backup(1); } : IN_FORMAL_COMMENT
|
"/*" : IN_MULTI_LINE_COMMENT
}
SPECIAL_TOKEN :
{
: DEFAULT
}
SPECIAL_TOKEN :
{
: DEFAULT
}
SPECIAL_TOKEN :
{
: DEFAULT
}
MORE :
{
< ~[] >
}
/* RESERVED WORDS AND LITERALS */
TOKEN :
{
< ABSTRACT: "abstract" >
| < ASSERT: "assert" >
| < 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: "else" >
| < ENUM: "enum" >
| < EXTENDS: "extends" >
| < FALSE: "false" >
| < FINAL: "final" >
| < FINALLY: "finally" >
| < FLOAT: "float" >
| < FOR: "for" >
| < GOTO: "goto" >
| < IF: "if" >
| < IMPLEMENTS: "implements" >
| < IMPORT: "import" >
| < INSTANCEOF: "instanceof" >
| < INT: "int" >
| < INTERFACE: "interface" >
| < LONG: "long" >
| < NATIVE: "native" >
| < NEW: "new" >
| < NULL: "null" >
| < 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" >
| < TRUE: "true" >
| < TRY: "try" >
| < VOID: "void" >
| < VOLATILE: "volatile" >
| < WHILE: "while" >
}
/* LITERALS */
TOKEN :
{
< LONG_LITERAL:
(["l","L"])
| (["l","L"])
| (["l","L"])
>
|
< INTEGER_LITERAL:
|
|
>
|
< #DECIMAL_LITERAL: ["1"-"9"] (["0"-"9"])* >
|
< #HEX_LITERAL: "0" ["x","X"] (["0"-"9","a"-"f","A"-"F"])+ >
|
< #OCTAL_LITERAL: "0" (["0"-"7"])* >
|
< FLOATING_POINT_LITERAL:
(["0"-"9"])+ "." (["0"-"9"])* ()? (["f","F","d","D"])?
| "." (["0"-"9"])+ ()? (["f","F","d","D"])?
| (["0"-"9"])+ (["f","F","d","D"])?
| (["0"-"9"])+ ()? ["f","F","d","D"]
>
|
< #EXPONENT: ["e","E"] (["+","-"])? (["0"-"9"])+ >
|
< CHARACTER_LITERAL:
"'"
( (~["'","\\","\n","\r"])
| ("\\"
( ["n","t","b","r","f","\\","'","\""]
| ["0"-"7"] ( ["0"-"7"] )?
| ["0"-"3"] ["0"-"7"] ["0"-"7"]
)
)
| ("\\u"
["0"-"9","A"-"F","a"-"f"]
["0"-"9","A"-"F","a"-"f"]
["0"-"9","A"-"F","a"-"f"]
["0"-"9","A"-"F","a"-"f"]
)
)
"'"
>
|
< STRING_LITERAL:
"\""
( (~["\"","\\","\n","\r"])
| ("\\"
( ["n","t","b","r","f","\\","'","\""]
| ["0"-"7"] ( ["0"-"7"] )?
| ["0"-"3"] ["0"-"7"] ["0"-"7"]
)
)
| ("\\u"
["0"-"9","A"-"F","a"-"f"]
["0"-"9","A"-"F","a"-"f"]
["0"-"9","A"-"F","a"-"f"]
["0"-"9","A"-"F","a"-"f"]
)
)*
"\""
>
}
/* IDENTIFIERS */
TOKEN :
{
< IDENTIFIER: (|)* >
|
< #LETTER:
[
"\u0024",
"\u0041"-"\u005a",
"\u005f",
"\u0061"-"\u007a",
"\u00c0"-"\u00d6",
"\u00d8"-"\u00f6",
"\u00f8"-"\u00ff",
"\u0100"-"\u1fff",
"\u3040"-"\u318f",
"\u3300"-"\u337f",
"\u3400"-"\u3d2d",
"\u4e00"-"\u9fff",
"\uf900"-"\ufaff"
]
>
|
< #DIGIT:
[
"\u0030"-"\u0039",
"\u0660"-"\u0669",
"\u06f0"-"\u06f9",
"\u0966"-"\u096f",
"\u09e6"-"\u09ef",
"\u0a66"-"\u0a6f",
"\u0ae6"-"\u0aef",
"\u0b66"-"\u0b6f",
"\u0be7"-"\u0bef",
"\u0c66"-"\u0c6f",
"\u0ce6"-"\u0cef",
"\u0d66"-"\u0d6f",
"\u0e50"-"\u0e59",
"\u0ed0"-"\u0ed9",
"\u1040"-"\u1049"
]
>
}
/* SEPARATORS */
TOKEN :
{
< LPAREN: "(" >
| < RPAREN: ")" >
| < LBRACE: "{" >
| < RBRACE: "}" >
| < LBRACKET: "[" >
| < RBRACKET: "]" >
| < SEMICOLON: ";" >
| < COMMA: "," >
| < DOT: "." >
| < AT: "@" >
}
/* OPERATORS */
TOKEN :
{
< ASSIGN: "=" >
| < LT: "<" >
| < BANG: "!" >
| < TILDE: "~" >
| < HOOK: "?" >
| < COLON: ":" >
| < EQ: "==" >
| < LE: "<=" >
| < GE: ">=" >
| < NE: "!=" >
| < SC_OR: "||" >
| < SC_AND: "&&" >
| < INCR: "++" >
| < DECR: "--" >
| < PLUS: "+" >
| < MINUS: "-" >
| < STAR: "*" >
| < SLASH: "/" >
| < BIT_AND: "&" >
| < BIT_OR: "|" >
| < XOR: "^" >
| < REM: "%" >
| < LSHIFT: "<<" >
| < PLUSASSIGN: "+=" >
| < MINUSASSIGN: "-=" >
| < STARASSIGN: "*=" >
| < SLASHASSIGN: "/=" >
| < ANDASSIGN: "&=" >
| < ORASSIGN: "|=" >
| < XORASSIGN: "^=" >
| < REMASSIGN: "%=" >
| < LSHIFTASSIGN: "<<=" >
| < RSIGNEDSHIFTASSIGN: ">>=" >
| < RUNSIGNEDSHIFTASSIGN: ">>>=" >
| < ELLIPSIS: "..." >
}
/* >'s need special attention due to generics syntax. */
TOKEN :
{
< RUNSIGNEDSHIFT: ">>>" >
{
matchedToken.kind = GT;
((Token.GTToken)matchedToken).realKind = RUNSIGNEDSHIFT;
input_stream.backup(2);
}
| < RSIGNEDSHIFT: ">>" >
{
matchedToken.kind = GT;
((Token.GTToken)matchedToken).realKind = RSIGNEDSHIFT;
input_stream.backup(1);
}
| < GT: ">" >
}
/*****************************************
* THE JAVA LANGUAGE GRAMMAR STARTS HERE *
*****************************************/
/*
* Program structuring syntax follows.
*/
CompilationUnit CompilationUnit():
{
NameExpr pakage = null;
List imports = null;
ImportDeclaration in = null;
List types = null;
TypeDeclaration tn = null;
}
{
[ pakage = PackageDeclaration() ]
( in = ImportDeclaration() { imports = add(imports, in); } )*
( tn = TypeDeclaration() { types = add(types, tn); } )*
{ return new CompilationUnit(pakage, imports, types); }
}
NameExpr PackageDeclaration():
{
NameExpr ret;
}
{
"package" ret = Name() ";"
{ return ret; }
}
ImportDeclaration ImportDeclaration():
{
NameExpr name;
boolean isStatic = false;
boolean isAsterisk = false;
}
{
"import" [ "static" { isStatic = true; } ] name = Name() [ "." "*" { isAsterisk = true; } ] ";"
{ return new ImportDeclaration(name, isStatic, isAsterisk); }
}
/*
* Modifiers. We match all modifiers in a single rule to reduce the chances of
* syntax errors for simple modifier mistakes. It will also enable us to give
* better error messages.
*/
Modifier Modifiers():
{
int modifiers = 0;
List annotations = null;
AnnotationExpr ann;
}
{
(
LOOKAHEAD(2)
(
"public" { modifiers = ModifierSet.addModifier(modifiers, ModifierSet.PUBLIC, token); }
|
"static" { modifiers = ModifierSet.addModifier(modifiers, ModifierSet.STATIC, token); }
|
"protected" { modifiers = ModifierSet.addModifier(modifiers, ModifierSet.PROTECTED, token); }
|
"private" { modifiers = ModifierSet.addModifier(modifiers, ModifierSet.PRIVATE, token); }
|
"final" { modifiers = ModifierSet.addModifier(modifiers, ModifierSet.FINAL, token); }
|
"abstract" { modifiers = ModifierSet.addModifier(modifiers, ModifierSet.ABSTRACT, token); }
|
"synchronized" { modifiers = ModifierSet.addModifier(modifiers, ModifierSet.SYNCHRONIZED, token); }
|
"native" { modifiers = ModifierSet.addModifier(modifiers, ModifierSet.NATIVE, token); }
|
"transient" { modifiers = ModifierSet.addModifier(modifiers, ModifierSet.TRANSIENT, token); }
|
"volatile" { modifiers = ModifierSet.addModifier(modifiers, ModifierSet.VOLATILE, token); }
|
"strictfp" { modifiers = ModifierSet.addModifier(modifiers, ModifierSet.STRICTFP, token); }
|
ann = Annotation() { annotations = add(annotations, ann); }
)
)*
{
return new Modifier(modifiers, annotations);
}
}
/*
* Declaration syntax follows.
*/
TypeDeclaration TypeDeclaration():
{
Modifier modifier;
TypeDeclaration ret;
}
{
";" { return EmptyTypeDeclaration.SINGLETON; }
|
modifier = Modifiers()
(
ret = ClassOrInterfaceDeclaration(modifier)
|
ret = EnumDeclaration(modifier)
|
ret = AnnotationTypeDeclaration(modifier)
)
{ return ret; }
}
ClassOrInterfaceDeclaration ClassOrInterfaceDeclaration(Modifier modifier):
{
boolean isInterface = false;
String name;
List typePar = null;
List extList = null;
List impList = null;
List members;
}
{
( "class" | "interface" { isInterface = true; } )
{ name = token.image; }
[ typePar = TypeParameters() ]
[ extList = ExtendsList(isInterface) ]
[ impList = ImplementsList(isInterface) ]
members = ClassOrInterfaceBody(isInterface)
{ return new ClassOrInterfaceDeclaration(modifier.modifiers, modifier.annotations, isInterface, name, typePar, extList, impList, members); }
}
List ExtendsList(boolean isInterface):
{
boolean extendsMoreThanOne = false;
List ret = new LinkedList();
ClassOrInterfaceType cit;
}
{
"extends" cit = ClassOrInterfaceType() { ret.add(cit); }
( "," cit = ClassOrInterfaceType() { ret.add(cit); extendsMoreThanOne = true; } )*
{
if (extendsMoreThanOne && !isInterface)
throw new ParseException(token, "A class cannot extend more than one other class");
}
{ return ret; }
}
List ImplementsList(boolean isInterface):
{
List ret = new LinkedList();
ClassOrInterfaceType cit;
}
{
"implements" cit = ClassOrInterfaceType() { ret.add(cit); }
( "," cit = ClassOrInterfaceType() { ret.add(cit); } )*
{
if (isInterface)
throw new ParseException(token, "An interface cannot implement other interfaces");
}
{ return ret; }
}
EnumDeclaration EnumDeclaration(Modifier modifier):
{
String name;
List impList = null;
EnumConstantDeclaration entry;
List entries = null;
BodyDeclaration member;
List members = null;
}
{
"enum" { name = token.image; }
[ impList = ImplementsList(false) ]
"{"
[
{ entries = new LinkedList(); }
entry = EnumConstant() { entries.add(entry); } ( LOOKAHEAD(2) "," entry = EnumConstant() { entries.add(entry); } )*
]
[
","
|
( ";" ( member = ClassOrInterfaceBodyDeclaration(false) { members = add(members, member); } )* )
]
"}"
{ return new EnumDeclaration(modifier.modifiers, modifier.annotations, name, impList, entries, members); }
}
EnumConstantDeclaration EnumConstant():
{
String name;
List args = null;
List classBody = null;
}
{
{ name = token.image; } [ args = Arguments() ] [ classBody = ClassOrInterfaceBody(false) ]
{ return new EnumConstantDeclaration(name, args, classBody); }
}
List TypeParameters():
{
List ret = new LinkedList();
TypeParameter tp;
}
{
"<" tp = TypeParameter() { ret.add(tp); }
( "," tp = TypeParameter() { ret.add(tp); } )* ">"
{ return ret; }
}
TypeParameter TypeParameter():
{
String name;
List typeBound = null;
}
{
{ name = token.image; } [ typeBound = TypeBound() ]
{ return new TypeParameter(name, typeBound); }
}
List TypeBound():
{
List ret = new LinkedList();
ClassOrInterfaceType cit;
}
{
"extends" cit = ClassOrInterfaceType() { ret.add(cit); }
( "&" cit = ClassOrInterfaceType() { ret.add(cit); } )*
{ return ret; }
}
List ClassOrInterfaceBody(boolean isInterface):
{
List ret = null;
BodyDeclaration member;
}
{
"{" ( member = ClassOrInterfaceBodyDeclaration(isInterface) { ret = add(ret, member); } )* "}"
{ return ret; }
}
BodyDeclaration ClassOrInterfaceBodyDeclaration(boolean isInterface):
{
boolean isNestedInterface = false;
Modifier modifier;
BodyDeclaration ret;
}
{
(
LOOKAHEAD(2)
ret = Initializer()
{
if (isInterface)
throw new ParseException(token, "An interface cannot have initializers");
}
|
modifier = Modifiers() // Just get all the modifiers out of the way. If you want to do
// more checks, pass the modifiers down to the member
(
ret = ClassOrInterfaceDeclaration(modifier)
|
ret = EnumDeclaration(modifier)
|
ret = AnnotationTypeDeclaration(modifier)
|
LOOKAHEAD( [ TypeParameters() ] "(" )
ret = ConstructorDeclaration(modifier)
|
LOOKAHEAD( Type() ( "[" "]" )* ( "," | "=" | ";" ) )
ret = FieldDeclaration(modifier)
|
ret = MethodDeclaration(modifier)
)
|
";" { ret = EmptyMemberDeclaration.SINGLETON; }
)
{ return ret; }
}
FieldDeclaration FieldDeclaration(Modifier modifier):
{
Type type;
List variables = new LinkedList();
VariableDeclarator val;
}
{
// Modifiers are already matched in the caller
type = Type()
val = VariableDeclarator() { variables.add(val); }
( "," val = VariableDeclarator() { variables.add(val); } )* ";"
{ return new FieldDeclaration(modifier.modifiers, modifier.annotations, type, variables); }
}
VariableDeclarator VariableDeclarator():
{
VariableDeclaratorId id;
Expression init = null;
}
{
id = VariableDeclaratorId() [ "=" init = VariableInitializer() ]
{ return new VariableDeclarator(id, init); }
}
VariableDeclaratorId VariableDeclaratorId():
{
String name;
int arrayCount = 0;
}
{
{ name = token.image; } ( "[" "]" { arrayCount++; } )*
{ return new VariableDeclaratorId(name, arrayCount); }
}
Expression VariableInitializer():
{
Expression ret;
}
{
(
ret = ArrayInitializer()
|
ret = Expression()
)
{ return ret;}
}
ArrayInitializerExpr ArrayInitializer():
{
List values = null;
Expression val;
}
{
"{" [ val = VariableInitializer() { values = add(values, val); } ( LOOKAHEAD(2) "," val = VariableInitializer() { values = add(values, val); } )* ] [ "," ] "}"
{ return new ArrayInitializerExpr(values); }
}
MethodDeclaration MethodDeclaration(Modifier modifier):
{
List typeParameters = null;
Type type;
String name;
List parameters;
int arrayCount = 0;
List throws_ = null;
BlockStmt block = null;
}
{
// Modifiers already matched in the caller!
[ typeParameters = TypeParameters() ]
type = ResultType()
{ name = token.image; } parameters = FormalParameters() ( "[" "]" { arrayCount++; } )*
[ "throws" throws_ = NameList() ]
( block = Block() | ";" )
{ return new MethodDeclaration(modifier.modifiers, modifier.annotations, typeParameters, type, name, parameters, arrayCount, throws_, block); }
}
List FormalParameters():
{
List ret = null;
Parameter par;
}
{
"(" [ par = FormalParameter() { ret = add(ret, par); } ( "," par = FormalParameter() { ret = add(ret, par); } )* ] ")"
{ return ret; }
}
Parameter FormalParameter():
{
Modifier modifier;
Type type;
boolean isVarArg = false;
VariableDeclaratorId id;
}
{
modifier = Modifiers() type = Type() [ "..." { isVarArg = true;} ] id = VariableDeclaratorId()
{ return new Parameter(modifier.modifiers, modifier.annotations, type, isVarArg, id); }
}
ConstructorDeclaration ConstructorDeclaration(Modifier modifier):
{
List typeParameters = null;
String name;
List parameters;
List throws_ = null;
ExplicitConstructorInvocationStmt exConsInv = null;
List stmts;
}
{
[ typeParameters = TypeParameters() ]
// Modifiers matched in the caller
{ name = token.image;} parameters = FormalParameters() [ "throws" throws_ = NameList() ]
"{"
[ LOOKAHEAD(ExplicitConstructorInvocation()) exConsInv = ExplicitConstructorInvocation() ]
stmts = Statements()
"}"
{
if (exConsInv != null) {
if (stmts == null) {
stmts = new LinkedList();
}
stmts.add(0, exConsInv);
}
return new ConstructorDeclaration(modifier.modifiers, modifier.annotations, typeParameters, name, parameters, throws_, new BlockStmt(stmts));
}
}
ExplicitConstructorInvocationStmt ExplicitConstructorInvocation():
{
boolean isThis = false;
List args;
Expression expr = null;
}
{
(
LOOKAHEAD("this" Arguments() ";")
"this" { isThis = true; } args = Arguments() ";"
|
[ LOOKAHEAD(2) expr = PrimaryExpression() "." ] "super" args = Arguments() ";"
)
{ return new ExplicitConstructorInvocationStmt(isThis, expr, args); }
}
List Statements():
{
List ret = null;
Statement stmt;
}
{
( stmt = BlockStatement() { ret = add(ret, stmt); } )*
{ return ret; }
}
InitializerDeclaration Initializer():
{
BlockStmt block;
}
{
[ "static" ] block = Block()
{ return new InitializerDeclaration(block); }
}
/*
* Type, name and expression syntax follows.
*/
Type Type():
{
Type ret;
}
{
(
LOOKAHEAD(2) ret = ReferenceType()
|
ret = PrimitiveType()
)
{ return ret; }
}
ReferenceType ReferenceType():
{
Type type;
int arrayCount = 0;
}
{
(
type = PrimitiveType() ( LOOKAHEAD(2) "[" "]" { arrayCount++; } )+
|
type = ClassOrInterfaceType() ( LOOKAHEAD(2) "[" "]" { arrayCount++; } )*
)
{ return new ReferenceType(type, arrayCount); }
}
ClassOrInterfaceType ClassOrInterfaceType():
{
ClassOrInterfaceType ret;
String name;
List typeArgs = null;
}
{
{ name = token.image; } [ LOOKAHEAD(2) typeArgs = TypeArguments() ] { ret = new ClassOrInterfaceType(null, name, typeArgs); }
( LOOKAHEAD(2) "." { name = token.image; } [ LOOKAHEAD(2) typeArgs = TypeArguments() ] { ret = new ClassOrInterfaceType(ret, name, typeArgs); } )*
{ return ret; }
}
List TypeArguments():
{
List ret = new LinkedList();
Type type;
}
{
"<" type = TypeArgument() { ret.add(type); } ( "," type = TypeArgument() { ret.add(type); } )* ">"
{ return ret; }
}
Type TypeArgument():
{
Type ret;
}
{
(
ret = ReferenceType()
|
ret = Wildcard()
)
{ return ret; }
}
WildcardType Wildcard():
{
ReferenceType ext = null;
ReferenceType sup = null;
}
{
"?"
[
"extends" ext = ReferenceType()
|
"super" sup = ReferenceType()
]
{ return new WildcardType(ext, sup); }
}
PrimitiveType PrimitiveType():
{
PrimitiveType ret;
}
{
(
"boolean" { ret = PrimitiveType.BOOLEAN; }
|
"char" { ret = PrimitiveType.CHAR; }
|
"byte" { ret = PrimitiveType.BYTE; }
|
"short" { ret = PrimitiveType.SHORT; }
|
"int" { ret = PrimitiveType.INT; }
|
"long" { ret = PrimitiveType.LONG; }
|
"float" { ret = PrimitiveType.FLOAT; }
|
"double" { ret = PrimitiveType.DOUBLE; }
)
{ return ret; }
}
Type ResultType():
{
Type ret;
}
{
(
"void" { ret = VoidType.SINGLETON; }
|
ret = Type()
)
{ return ret; }
}
NameExpr Name():
/*
* A lookahead of 2 is required below since "Name" can be followed
* by a ".*" when used in the context of an "ImportDeclaration".
*/
{
NameExpr ret;
}
{
{ ret = new NameExpr(token.image); }
( LOOKAHEAD(2) "." { ret = new QualifiedNameExpr(ret, token.image); } )*
{ return ret; }
}
List NameList():
{
List ret = new LinkedList();
NameExpr name;
}
{
name = Name() { ret.add(name); } ( "," name = Name() { ret.add(name); } )*
{ return ret; }
}
/*
* Expression syntax follows.
*/
Expression Expression():
/*
* This expansion has been written this way instead of:
* Assignment() | ConditionalExpression()
* for performance reasons.
* However, it is a weakening of the grammar for it allows the LHS of
* assignments to be any conditional expression whereas it can only be
* a primary expression. Consider adding a semantic predicate to work
* around this.
*/
{
Expression ret;
AssignExpr.Operator op;
Expression value;
}
{
ret = ConditionalExpression()
[
LOOKAHEAD(2)
op = AssignmentOperator() value = Expression() { ret = new AssignExpr(ret, value, op); }
]
{ return ret; }
}
AssignExpr.Operator AssignmentOperator():
{
AssignExpr.Operator ret;
}
{
(
"=" { ret = AssignExpr.Operator.assign; }
| "*=" { ret = AssignExpr.Operator.star; }
| "/=" { ret = AssignExpr.Operator.slash; }
| "%=" { ret = AssignExpr.Operator.rem; }
| "+=" { ret = AssignExpr.Operator.plus; }
| "-=" { ret = AssignExpr.Operator.minus; }
| "<<=" { ret = AssignExpr.Operator.lShift; }
| ">>=" { ret = AssignExpr.Operator.rSignedShift; }
| ">>>=" { ret = AssignExpr.Operator.rUnsignedShift; }
| "&=" { ret = AssignExpr.Operator.and; }
| "^=" { ret = AssignExpr.Operator.xor; }
| "|=" { ret = AssignExpr.Operator.or; }
)
{ return ret; }
}
Expression ConditionalExpression():
{
Expression ret;
Expression left;
Expression right;
}
{
ret = ConditionalOrExpression() [ "?" left = Expression() ":" right = Expression() { ret = new ConditionalExpr(ret, left, right); } ]
{ return ret; }
}
Expression ConditionalOrExpression():
{
Expression ret;
Expression right;
}
{
ret = ConditionalAndExpression() ( "||" right = ConditionalAndExpression() { ret = new BinaryExpr(ret, right, BinaryExpr.Operator.or); } )*
{ return ret; }
}
Expression ConditionalAndExpression():
{
Expression ret;
Expression right;
}
{
ret = InclusiveOrExpression() ( "&&" right = InclusiveOrExpression() { ret = new BinaryExpr(ret, right, BinaryExpr.Operator.and); } )*
{ return ret; }
}
Expression InclusiveOrExpression():
{
Expression ret;
Expression right;
}
{
ret = ExclusiveOrExpression() ( "|" right = ExclusiveOrExpression() { ret = new BinaryExpr(ret, right, BinaryExpr.Operator.binOr); } )*
{ return ret; }
}
Expression ExclusiveOrExpression():
{
Expression ret;
Expression right;
}
{
ret = AndExpression() ( "^" right = AndExpression() { ret = new BinaryExpr(ret, right, BinaryExpr.Operator.xor); } )*
{ return ret; }
}
Expression AndExpression():
{
Expression ret;
Expression right;
}
{
ret = EqualityExpression() ( "&" right = EqualityExpression() { ret = new BinaryExpr(ret, right, BinaryExpr.Operator.binAnd); } )*
{ return ret; }
}
Expression EqualityExpression():
{
Expression ret;
Expression right;
BinaryExpr.Operator op;
}
{
ret = InstanceOfExpression()
(
( "==" { op = BinaryExpr.Operator.equals; } |
"!=" { op = BinaryExpr.Operator.notEquals; }
) right = InstanceOfExpression() { ret = new BinaryExpr(ret, right, op); }
)*
{ return ret; }
}
Expression InstanceOfExpression():
{
Expression ret;
Type type;
}
{
ret = RelationalExpression() [ "instanceof" type = Type() { ret = new InstanceOfExpr(ret, type); } ]
{ return ret; }
}
Expression RelationalExpression():
{
Expression ret;
Expression right;
BinaryExpr.Operator op;
}
{
ret = ShiftExpression()
(
( "<" { op = BinaryExpr.Operator.less; } |
">" { op = BinaryExpr.Operator.greater; } |
"<=" { op = BinaryExpr.Operator.lessEquals; } |
">=" { op = BinaryExpr.Operator.greaterEquals; }
) right = ShiftExpression() { ret = new BinaryExpr(ret, right, op); }
)*
{ return ret; }
}
Expression ShiftExpression():
{
Expression ret;
Expression right;
BinaryExpr.Operator op;
}
{
ret = AdditiveExpression()
(
( "<<" { op = BinaryExpr.Operator.lShift; } |
RSIGNEDSHIFT() { op = BinaryExpr.Operator.rSignedShift; } |
RUNSIGNEDSHIFT() { op = BinaryExpr.Operator.rUnsignedShift; }
) right = AdditiveExpression() { ret = new BinaryExpr(ret, right, op); }
)*
{ return ret; }
}
Expression AdditiveExpression():
{
Expression ret;
Expression right;
BinaryExpr.Operator op;
}
{
ret = MultiplicativeExpression()
(
( "+" { op = BinaryExpr.Operator.plus; } |
"-" { op = BinaryExpr.Operator.minus; }
) right = MultiplicativeExpression() { ret = new BinaryExpr(ret, right, op); }
)*
{ return ret; }
}
Expression MultiplicativeExpression():
{
Expression ret;
Expression right;
BinaryExpr.Operator op;
}
{
ret = UnaryExpression()
(
( "*" { op = BinaryExpr.Operator.times; } |
"/" { op = BinaryExpr.Operator.divide; } |
"%" { op = BinaryExpr.Operator.remainder; }
) right = UnaryExpression() { ret = new BinaryExpr(ret, right, op); }
)*
{ return ret; }
}
Expression UnaryExpression():
{
Expression ret;
UnaryExpr.Operator op;
}
{
(
( "+" { op = UnaryExpr.Operator.positive; } |
"-" { op = UnaryExpr.Operator.negative; }
) ret = UnaryExpression() { ret = new UnaryExpr(ret, op); }
|
ret = PreIncrementExpression()
|
ret = PreDecrementExpression()
|
ret = UnaryExpressionNotPlusMinus()
)
{ return ret; }
}
Expression PreIncrementExpression():
{
Expression ret;
}
{
"++" ret = PrimaryExpression() { ret = new UnaryExpr(ret, UnaryExpr.Operator.preIncrement); }
{ return ret; }
}
Expression PreDecrementExpression():
{
Expression ret;
}
{
"--" ret = PrimaryExpression() { ret = new UnaryExpr(ret, UnaryExpr.Operator.preDecrement); }
{ return ret; }
}
Expression UnaryExpressionNotPlusMinus():
{
Expression ret;
UnaryExpr.Operator op;
}
{
(
( "~" { op = UnaryExpr.Operator.inverse; } |
"!" { op = UnaryExpr.Operator.not; }
) ret = UnaryExpression() { ret = new UnaryExpr(ret, op); }
|
LOOKAHEAD( CastLookahead() )
ret = CastExpression()
|
ret = PostfixExpression()
)
{ return ret; }
}
// This production is to determine lookahead only. The LOOKAHEAD specifications
// below are not used, but they are there just to indicate that we know about
// this.
void CastLookahead():
{}
{
LOOKAHEAD(2)
"(" PrimitiveType()
|
LOOKAHEAD("(" Type() "[")
"(" Type() "[" "]"
|
"(" Type() ")" ( "~" | "!" | "(" | | "this" | "super" | "new" | Literal() )
}
Expression PostfixExpression():
{
Expression ret;
UnaryExpr.Operator op;
}
{
ret = PrimaryExpression()
[
LOOKAHEAD(2)
( "++" { op = UnaryExpr.Operator.posIncrement; } |
"--" { op = UnaryExpr.Operator.posDecrement; }
) { ret = new UnaryExpr(ret, op); }
]
{ return ret; }
}
Expression CastExpression():
{
Expression ret;
Type type;
}
{
(
LOOKAHEAD("(" PrimitiveType())
"(" type = Type() ")" ret = UnaryExpression() { ret = new CastExpr(ret, type); }
|
"(" type = Type() ")" ret = UnaryExpressionNotPlusMinus() { ret = new CastExpr(ret, type); }
)
{ return ret; }
}
Expression PrimaryExpression():
{
Expression ret;
Expression inner;
}
{
ret = PrimaryPrefix() ( LOOKAHEAD(2) ret = PrimarySuffix(ret) )*
{ return ret; }
}
Expression PrimaryPrefix():
{
Expression ret;
NameExpr name;
Type type;
}
{
(
ret = Literal()
|
"this" { ret = ThisExpr.SINGLETON; }
|
"super" "." { ret = new SuperMemberAccessExpr(token.image); }
|
"(" ret = Expression() ")" { ret = new EnclosedExpr(ret); }
|
ret = AllocationExpression(null)
|
LOOKAHEAD( ResultType() "." "class" )
type = ResultType() "." "class" { ret = new ClassExpr(type); }
|
ret = Name()
)
{ return ret; }
}
Expression PrimarySuffix(Expression scope):
{
Expression ret;
List list = null;
}
{
(
"."
(
"this" { ret = new ThisExpr(scope); }
|
"super" { ret = new SuperExpr(scope); }
|
ret = AllocationExpression(scope)
|
[ list = TypeArguments() ] { ret = new FieldAccessExpr(scope, list, token.image); }
)
|
"[" ret = Expression() "]" { ret = new ArrayAccessExpr(scope, ret); }
|
list = Arguments() { ret = new MethodCallExpr(scope, list); }
)
{ return ret; }
}
Expression Literal():
{
Expression ret;
}
{
(
{
try {
ret = LiteralExpr.newIntegerLiteral(token.image);
} catch (NumberFormatException e) {
throw new ParseException(token, "Integer literal out of range");
}
}
|
{
try {
ret = LiteralExpr.newLongLiteral(token.image);
} catch (NumberFormatException e) {
throw new ParseException(token, "Long literal out of range");
}
}
|
{
try {
ret = new LiteralExpr(Double.parseDouble(token.image));
} catch (NumberFormatException e) {
throw new ParseException(token, "Invalid floating literal format");
}
}
|
{
try {
ret = LiteralExpr.newCharLiteral(token.image);
} catch (NumberFormatException e) {
throw new ParseException(token, "Invalid char literal format");
}
}
|
{ ret = new LiteralExpr(token.image.substring(1, token.image.length()-1)); }
|
ret = BooleanLiteral()
|
ret = NullLiteral()
)
{ return ret; }
}
Expression BooleanLiteral():
{
Expression ret;
}
{
(
"true" { ret = new LiteralExpr(Boolean.TRUE); }
|
"false" { ret = new LiteralExpr(Boolean.FALSE); }
)
{ return ret; }
}
Expression NullLiteral():
{}
{
"null"
{ return new LiteralExpr(null); }
}
List Arguments():
{
List ret = null;
}
{
"(" [ ret = ArgumentList() ] ")"
{ return ret; }
}
List ArgumentList():
{
List ret = new LinkedList();
Expression expr;
}
{
expr = Expression() { ret.add(expr); } ( "," expr = Expression() { ret.add(expr); } )*
{ return ret; }
}
Expression AllocationExpression(Expression scope):
{
Expression ret;
Type type;
Object[] arr = null;
List typeArgs = null;
List anonymousBody = null;
List args;
}
{
(
LOOKAHEAD(2)
"new" type = PrimitiveType() arr = ArrayDimsAndInits()
{
if (arr[0] instanceof Integer) {
ret = new ArrayCreationExpr(type, null, ((Integer)arr[0]).intValue(), (ArrayInitializerExpr)arr[1]);
} else {
ret = new ArrayCreationExpr(type, null, (List)arr[0], ((Integer)arr[1]).intValue());
}
}
|
"new" type = ClassOrInterfaceType() [ typeArgs = TypeArguments() ]
(
arr = ArrayDimsAndInits()
{
if (arr[0] instanceof Integer) {
ret = new ArrayCreationExpr(type, typeArgs, ((Integer)arr[0]).intValue(), (ArrayInitializerExpr)arr[1]);
} else {
ret = new ArrayCreationExpr(type, typeArgs, (List)arr[0], ((Integer)arr[1]).intValue());
}
}
|
args = Arguments() [ LOOKAHEAD(2) anonymousBody = ClassOrInterfaceBody(false) ]
{ ret = new ObjectCreationExpr(scope, (ClassOrInterfaceType) type, typeArgs, args, anonymousBody); }
)
)
{ return ret; }
}
/*
* The third LOOKAHEAD specification below is to parse to PrimarySuffix
* if there is an expression between the "[...]".
*/
Object[] ArrayDimsAndInits():
{
Object[] ret = new Object[2];
Expression expr;
List inits = null;
int i = 0;
}
{
(
LOOKAHEAD(2)
( LOOKAHEAD(2) "[" expr = Expression() { inits = add(inits, expr); } "]" )+ ( LOOKAHEAD(2) "[" "]" { i++; } )* { ret[0] = inits; ret[1] = new Integer(i); }
|
( "[" "]" { i++; } )+ expr = ArrayInitializer() { ret[0] = new Integer(i); ret[1] = expr; }
)
{ return ret; }
}
/*
* Statement syntax follows.
*/
Statement Statement():
{
Statement ret;
}
{
(
LOOKAHEAD(2)
ret = LabeledStatement()
|
ret = AssertStatement()
|
ret = Block()
|
ret = EmptyStatement()
|
ret = StatementExpression()
|
ret = SwitchStatement()
|
ret = IfStatement()
|
ret = WhileStatement()
|
ret = DoStatement()
|
ret = ForStatement()
|
ret = BreakStatement()
|
ret = ContinueStatement()
|
ret = ReturnStatement()
|
ret = ThrowStatement()
|
ret = SynchronizedStatement()
|
ret = TryStatement()
)
{ return ret; }
}
AssertStmt AssertStatement():
{
Expression check;
Expression msg = null;
}
{
"assert" check = Expression() [ ":" msg = Expression() ] ";"
{ return new AssertStmt(check, msg); }
}
LabeledStmt LabeledStatement():
{
String label;
Statement stmt;
}
{
{ label = token.image; } ":" stmt = Statement()
{ return new LabeledStmt(label, stmt); }
}
BlockStmt Block():
{
List stmts;
}
{
"{" stmts = Statements() "}"
{ return new BlockStmt(stmts); }
}
/*
* Classes inside block stametents can only be abstract or final. The semantic must check it.
*/
Statement BlockStatement():
{
Statement ret;
Expression expr;
ClassOrInterfaceDeclaration typeDecl;
Modifier modifier;
}
{
(
LOOKAHEAD( Modifiers() ("class" | "interface") )
modifier = Modifiers()
typeDecl = ClassOrInterfaceDeclaration(modifier) { ret = new TypeDeclarationStmt(typeDecl); }
|
LOOKAHEAD(VariableDeclarationExpression() )
expr = VariableDeclarationExpression() { ret = new ExpressionStmt(expr); } ";"
|
ret = Statement()
)
{ return ret; }
}
VariableDeclarationExpr VariableDeclarationExpression():
{
Modifier modifier;
Type type;
List vars = new LinkedList();
VariableDeclarator var;
}
{
modifier = Modifiers() type = Type() var = VariableDeclarator() { vars.add(var); } ( "," var = VariableDeclarator() { vars.add(var); } )*
{ return new VariableDeclarationExpr(modifier.modifiers, modifier.annotations, type, vars); }
}
EmptyStmt EmptyStatement():
{}
{
";"
{ return EmptyStmt.SINGLETON; }
}
ExpressionStmt StatementExpression():
/*
* The last expansion of this production accepts more than the legal
* Java expansions for StatementExpression. This expansion does not
* use PostfixExpression for performance reasons.
*/
{
Expression expr;
AssignExpr.Operator op;
Expression value;
}
{
(
expr = PreIncrementExpression()
|
expr = PreDecrementExpression()
|
expr = PrimaryExpression()
[
"++" { expr = new UnaryExpr(expr, UnaryExpr.Operator.posIncrement); }
|
"--" { expr = new UnaryExpr(expr, UnaryExpr.Operator.posDecrement); }
|
op = AssignmentOperator() value = Expression() { expr = new AssignExpr(expr, value, op); }
]
)
";"
{ return new ExpressionStmt(expr); }
}
SwitchStmt SwitchStatement():
{
Expression selector;
SwitchEntryStmt entry;
List entries = null;
}
{
"switch" "(" selector = Expression() ")" "{"
( entry = SwitchEntry() { entries = add(entries, entry); } )*
"}"
{ return new SwitchStmt(selector, entries); }
}
SwitchEntryStmt SwitchEntry():
{
Expression label = null;
List stmts;
}
{
(
"case" label = Expression()
|
"default"
)
":" stmts = Statements()
{ return new SwitchEntryStmt(label, stmts); }
}
IfStmt IfStatement():
/*
* The disambiguating algorithm of JavaCC automatically binds dangling
* else's to the innermost if statement. The LOOKAHEAD specification
* is to tell JavaCC that we know what we are doing.
*/
{
Expression condition;
Statement thenStmt;
Statement elseStmt = null;
}
{
"if" "(" condition = Expression() ")" thenStmt = Statement() [ LOOKAHEAD(1) "else" elseStmt = Statement() ]
{ return new IfStmt(condition, thenStmt, elseStmt); }
}
WhileStmt WhileStatement():
{
Expression condition;
Statement body;
}
{
"while" "(" condition = Expression() ")" body = Statement()
{ return new WhileStmt(condition, body); }
}
DoStmt DoStatement():
{
Expression condition;
Statement body;
}
{
"do" body = Statement() "while" "(" condition = Expression() ")" ";"
{ return new DoStmt(condition, body); }
}
Statement ForStatement():
{
String id = null;
VariableDeclarationExpr varExpr = null;
Expression expr = null;
List init = null;
List update = null;
Statement body;
}
{
"for" "("
(
LOOKAHEAD(VariableDeclarationExpression() ":")
varExpr = VariableDeclarationExpression() ":" expr = Expression()
|
[ init = ForInit() ] ";" [ expr = Expression() ] ";" [ update = ForUpdate() ]
)
")" body = Statement()
{
if (varExpr != null) {
return new ForeachStmt(varExpr, expr, body);
}
return new ForStmt(init, expr, update, body);
}
}
List ForInit():
{
List ret;
Expression expr;
}
{
(
LOOKAHEAD( Modifiers() Type() )
expr = VariableDeclarationExpression() { ret = new LinkedList(); ret.add(expr); }
|
ret = ExpressionList()
)
{ return ret; }
}
List ExpressionList():
{
List ret = new LinkedList();
Expression expr;
}
{
expr = Expression() { ret.add(expr); } ( "," expr = Expression() { ret.add(expr); } )*
{ return ret; }
}
List ForUpdate():
{
List ret;
}
{
ret = ExpressionList()
{ return ret; }
}
BreakStmt BreakStatement():
{
String id = null;
}
{
"break" [ { id = token.image; } ] ";"
{ return id == null ? BreakStmt.SINGLETON : new BreakStmt(id); }
}
ContinueStmt ContinueStatement():
{
String id = null;
}
{
"continue" [ { id = token.image; } ] ";"
{ return id == null ? ContinueStmt.SINGLETON : new ContinueStmt(id); }
}
ReturnStmt ReturnStatement():
{
Expression expr = null;
}
{
"return" [ expr = Expression() ] ";"
{ return new ReturnStmt(expr); }
}
ThrowStmt ThrowStatement():
{
Expression expr;
}
{
"throw" expr = Expression() ";"
{ return new ThrowStmt(expr); }
}
SynchronizedStmt SynchronizedStatement():
{
Expression expr;
BlockStmt block;
}
{
"synchronized" "(" expr = Expression() ")" block = Block()
{ return new SynchronizedStmt(expr, block); }
}
TryStmt TryStatement():
/*
* Semantic check required here to make sure that at least one
* finally/catch is present.
*/
{
BlockStmt tryBlock;
BlockStmt finallyBlock = null;
List catchs = null;
Parameter except;
BlockStmt catchBlock;
}
{
"try" tryBlock = Block()
( "catch" "(" except = FormalParameter() ")" catchBlock = Block() { catchs = add(catchs, new CatchClause(except, catchBlock)); } )*
[ "finally" finallyBlock = Block() ]
{ return new TryStmt(tryBlock, catchs, finallyBlock); }
}
/* We use productions to match >>>, >> and > so that we can keep the
* type declaration syntax with generics clean
*/
void RUNSIGNEDSHIFT():
{}
{
( LOOKAHEAD({ getToken(1).kind == GT &&
((Token.GTToken)getToken(1)).realKind == RUNSIGNEDSHIFT} )
">" ">" ">"
)
}
void RSIGNEDSHIFT():
{}
{
( LOOKAHEAD({ getToken(1).kind == GT &&
((Token.GTToken)getToken(1)).realKind == RSIGNEDSHIFT} )
">" ">"
)
}
/* Annotation syntax follows. */
AnnotationExpr Annotation():
{
AnnotationExpr ret;
}
{
(
LOOKAHEAD( "@" Name() "(" ( "=" | ")" ))
ret = NormalAnnotation()
|
LOOKAHEAD( "@" Name() "(" )
ret = SingleMemberAnnotation()
|
ret = MarkerAnnotation()
)
{ return ret; }
}
NormalAnnotationExpr NormalAnnotation():
{
NameExpr name;
List pairs = null;
}
{
"@" name = Name() "(" [ pairs = MemberValuePairs() ] ")"
{ return new NormalAnnotationExpr(name, pairs); }
}
MarkerAnnotationExpr MarkerAnnotation():
{
NameExpr name;
}
{
"@" name = Name()
{ return new MarkerAnnotationExpr(name); }
}
SingleMemberAnnotationExpr SingleMemberAnnotation():
{
NameExpr name;
Expression memberVal;
}
{
"@" name = Name() "(" memberVal = MemberValue() ")"
{ return new SingleMemberAnnotationExpr(name, memberVal); }
}
List MemberValuePairs():
{
List ret = new LinkedList();
MemberValuePair pair;
}
{
pair = MemberValuePair() { ret.add(pair); } ( "," pair = MemberValuePair() { ret.add(pair); } )*
{ return ret; }
}
MemberValuePair MemberValuePair():
{
String name;
Expression value;
}
{
{ name = token.image; } "=" value = MemberValue()
{ return new MemberValuePair(name, value); }
}
Expression MemberValue():
{
Expression ret;
}
{
(
ret = Annotation()
|
ret = MemberValueArrayInitializer()
|
ret = ConditionalExpression()
)
{ return ret; }
}
Expression MemberValueArrayInitializer():
{
List ret = new LinkedList();
Expression member;
}
{
"{" member = MemberValue() { ret.add(member); } ( LOOKAHEAD(2) "," member = MemberValue() { ret.add(member); } )* [ "," ] "}"
{ return new ArrayInitializerExpr(ret); }
}
/* Annotation Types. */
AnnotationDeclaration AnnotationTypeDeclaration(Modifier modifier):
{
String name;
List members;
}
{
"@" "interface" { name = token.image; } members = AnnotationTypeBody()
{ return new AnnotationDeclaration(modifier.modifiers, modifier.annotations, name, members); }
}
List AnnotationTypeBody():
{
List ret = null;
BodyDeclaration member;
}
{
"{" ( member = AnnotationBodyDeclaration() { ret = add(ret, member); } )* "}"
{ return ret; }
}
BodyDeclaration AnnotationBodyDeclaration():
{
Modifier modifier;
BodyDeclaration ret;
}
{
modifier = Modifiers()
(
(
LOOKAHEAD(Type() "(")
ret = AnnotationTypeMemberDeclaration(modifier)
|
ret = ClassOrInterfaceDeclaration(modifier)
|
ret = EnumDeclaration(modifier)
|
ret = AnnotationTypeDeclaration(modifier)
|
ret = FieldDeclaration(modifier)
)
|
";" { ret = EmptyTypeDeclaration.SINGLETON; }
)
{ return ret; }
}
AnnotationMemberDeclaration AnnotationTypeMemberDeclaration(Modifier modifier):
{
Type type;
String name;
Expression defaultVal = null;
}
{
type = Type() { name = token.image; } "(" ")" [ defaultVal = DefaultValue() ] ";"
{ return new AnnotationMemberDeclaration(modifier.modifiers, modifier.annotations, type, name, defaultVal); }
}
Expression DefaultValue():
{
Expression ret;
}
{
"default" ret = MemberValue()
{ return ret; }
}
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