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JavaCC is a parser/scanner generator for Java.
/* Copyright (c) 2006, Sun Microsystems, Inc.
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions are met:
*
* * Redistributions of source code must retain the above copyright notice,
* this list of conditions and the following disclaimer.
* * Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
* * Neither the name of the Sun Microsystems, Inc. nor the names of its
* contributors may be used to endorse or promote products derived from
* this software without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
* AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
* LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF
* THE POSSIBILITY OF SUCH DAMAGE.
*/
options {
JAVA_UNICODE_ESCAPE = true;
}
PARSER_BEGIN(JavaCCParser)
public class JavaCCParser {
public static void main(String args[]) {
JavaCCParser parser;
if (args.length == 0) {
System.out.println("JavaCC Parser: Reading from standard input . . .");
parser = new JavaCCParser(System.in);
} else if (args.length == 1) {
System.out.println("JavaCC Parser: Reading from file " + args[0] + " . . .");
try {
parser = new JavaCCParser(new java.io.FileInputStream(args[0]));
} catch (java.io.FileNotFoundException e) {
System.out.println("JavaCC Parser: File " + args[0] + " not found.");
return;
}
} else {
System.out.println("JavaCC Parser: Usage is one of:");
System.out.println(" java JavaCCParser < inputfile");
System.out.println("OR");
System.out.println(" java JavaCCParser inputfile");
return;
}
try {
parser.javacc_input();
System.out.println("JavaCC Parser: Java program parsed successfully.");
} catch (ParseException e) {
System.out.println(e.getMessage());
System.out.println("JavaCC Parser: Encountered errors during parse.");
}
}
/*
* Returns true if the next token is not in the FOLLOW list of "expansion".
* It is used to decide when the end of an "expansion" has been reached.
*/
static private boolean notTailOfExpansionUnit() {
Token t;
t = getToken(1);
if (t.kind == BIT_OR || t.kind == COMMA || t.kind == RPAREN || t.kind == RBRACE || t.kind == RBRACKET) return false;
return true;
}
}
PARSER_END(JavaCCParser)
/**********************************************
* THE JAVACC TOKEN SPECIFICATION STARTS HERE *
**********************************************/
/* JAVACC RESERVED WORDS: These are the only tokens in JavaCC but not in Java */
TOKEN :
{
< _OPTIONS: "options" >
| < _LOOKAHEAD: "LOOKAHEAD" >
| < _IGNORE_CASE: "IGNORE_CASE" >
| < _PARSER_BEGIN: "PARSER_BEGIN" >
| < _PARSER_END: "PARSER_END" >
| < _JAVACODE: "JAVACODE" >
| < _TOKEN: "TOKEN" >
| < _SPECIAL_TOKEN: "SPECIAL_TOKEN" >
| < _MORE: "MORE" >
| < _SKIP: "SKIP" >
| < _TOKEN_MGR_DECLS: "TOKEN_MGR_DECLS" >
| < _EOF: "EOF" >
}
/*
* The remainder of the tokens are exactly (except for the removal of tokens
* containing ">>" and "<<") as in the Java grammar and must be diff equivalent
* (again with the exceptions above) to it.
*/
/* 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 :
{
< ~[] >
}
/* JAVA RESERVED WORDS AND LITERALS */
TOKEN :
{
< ABSTRACT: "abstract" >
| < 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" >
| < 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" >
| < SUPER: "super" >
| < SWITCH: "switch" >
| < SYNCHRONIZED: "synchronized" >
| < THIS: "this" >
| < THROW: "throw" >
| < THROWS: "throws" >
| < TRANSIENT: "transient" >
| < TRUE: "true" >
| < TRY: "try" >
| < VOID: "void" >
| < VOLATILE: "volatile" >
| < WHILE: "while" >
}
/* JAVA LITERALS */
TOKEN :
{
< INTEGER_LITERAL:
(["l","L"])?
| (["l","L"])?
| (["l","L"])?
>
|
< #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"]
)
)
)
"'"
>
|
< STRING_LITERAL:
"\""
( (~["\"","\\","\n","\r"])
| ("\\"
( ["n","t","b","r","f","\\","'","\""]
| ["0"-"7"] ( ["0"-"7"] )?
| ["0"-"3"] ["0"-"7"] ["0"-"7"]
)
)
)*
"\""
>
}
/* 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: "." >
}
/* OPERATORS */
TOKEN :
{
< ASSIGN: "=" >
| < GT: ">" >
| < 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: "<<" >
// | < RSIGNEDSHIFT: ">>" >
// | < RUNSIGNEDSHIFT: ">>>" >
| < PLUSASSIGN: "+=" >
| < MINUSASSIGN: "-=" >
| < STARASSIGN: "*=" >
| < SLASHASSIGN: "/=" >
| < ANDASSIGN: "&=" >
| < ORASSIGN: "|=" >
| < XORASSIGN: "^=" >
| < REMASSIGN: "%=" >
// | < LSHIFTASSIGN: "<<=" >
// | < RSIGNEDSHIFTASSIGN: ">>=" >
// | < RUNSIGNEDSHIFTASSIGN: ">>>=" >
}
/************************************************
* THE JAVACC GRAMMAR SPECIFICATION STARTS HERE *
************************************************/
void javacc_input() :
{}
{
javacc_options()
"PARSER_BEGIN" "(" identifier() ")"
CompilationUnit()
"PARSER_END" "(" identifier() ")"
( production() )+
}
void javacc_options() :
{}
{
[ "options" "{" ( option_binding() )+ "}" ]
}
void option_binding() :
{}
{
( | "LOOKAHEAD" | "IGNORE_CASE" | "static" )
"="
( IntegerLiteral() | BooleanLiteral() | StringLiteral() )
";"
}
void production() :
{}
{
LOOKAHEAD(1)
/*
* Since JAVACODE is both a JavaCC reserved word and a Java identifier,
* we need to give preference to "javacode_production" over
* "bnf_production".
*/
javacode_production()
|
LOOKAHEAD(1)
/*
* Since SKIP, TOKEN, etc. are both JavaCC reserved words and Java
* identifiers, we need to give preference to "regular_expression_production"
* over "bnf_production".
*/
regular_expr_production()
|
LOOKAHEAD(1)
/*
* Since TOKEN_MGR_DECLS is both a JavaCC reserved word and a Java identifier,
* we need to give preference to "token_manager_decls" over
* "bnf_production".
*/
token_manager_decls()
|
bnf_production()
}
void javacode_production() :
{}
{
"JAVACODE"
ResultType() identifier() FormalParameters()
[ "throws" Name() ( "," Name() )* ]
[ node_descriptor() ]
Block()
}
void bnf_production() :
{}
{
ResultType() identifier() FormalParameters()
[ "throws" Name() ( "," Name() )* ]
[ node_descriptor() ]
":"
Block()
"{" expansion_choices() "}"
}
void regular_expr_production() :
{}
{
[
LOOKAHEAD(2) "<" "*" ">"
|
"<" ( "," )* ">"
]
regexpr_kind() [ "[" "IGNORE_CASE" "]" ] ":"
"{" regexpr_spec() ( "|" regexpr_spec() )* "}"
}
void token_manager_decls() :
{}
{
"TOKEN_MGR_DECLS" ":" ClassBody()
}
void regexpr_kind() :
{}
{
"TOKEN"
|
"SPECIAL_TOKEN"
|
"SKIP"
|
"MORE"
}
void regexpr_spec() :
{}
{
regular_expression() [ Block() ] [ ":" ]
}
void expansion_choices() :
{}
{
expansion() ( "|" expansion() )*
}
void expansion() :
{}
{
( LOOKAHEAD(1)
"LOOKAHEAD" "(" local_lookahead() ")"
)?
( LOOKAHEAD(0, { notTailOfExpansionUnit() } )
expansion_unit()
[ node_descriptor() ]
)+
}
void local_lookahead() :
{
boolean commaAtEnd = false, emptyLA = true;
}
{
[
/*
* The lookahead of 1 is to turn off the warning message that lets
* us know that an expansion choice can also start with an integer
* literal because a primary expression can do the same. But we
* know that this is what we want.
*/
LOOKAHEAD(1)
IntegerLiteral()
{
emptyLA = false;
}
]
[ LOOKAHEAD(0, { !emptyLA && (getToken(1).kind != RPAREN) } )
","
{
commaAtEnd = true;
}
]
[ LOOKAHEAD(0, { getToken(1).kind != RPAREN && getToken(1).kind != LBRACE } )
expansion_choices()
{
emptyLA = false; commaAtEnd = false;
}
]
[ LOOKAHEAD(0, { !emptyLA && !commaAtEnd && (getToken(1).kind != RPAREN) } )
","
{
commaAtEnd = true;
}
]
[ LOOKAHEAD(0, { emptyLA || commaAtEnd } )
"{" Expression() "}"
]
}
void expansion_unit() :
{}
{
LOOKAHEAD(1)
/*
* We give this priority over primary expressions which use LOOKAHEAD as the
* name of its identifier.
*/
"LOOKAHEAD" "(" local_lookahead() ")"
|
Block()
|
"[" expansion_choices() "]"
|
"try" "{" expansion_choices() "}"
( "catch" "(" Name() ")" Block() )*
[ "finally" Block() ]
|
LOOKAHEAD( identifier() | StringLiteral() | "<" | PrimaryExpression() "=" )
[
LOOKAHEAD(PrimaryExpression() "=")
PrimaryExpression() "="
]
( regular_expression() | identifier() Arguments() )
|
"(" expansion_choices() ")" ( "+" | "*" | "?" )?
}
void regular_expression() :
{}
{
StringLiteral()
|
LOOKAHEAD(3)
"<" [ [ "#" ] identifier() ":" ] complex_regular_expression_choices() ">"
|
LOOKAHEAD(2)
"<" identifier() ">"
|
"<" "EOF" ">"
}
void complex_regular_expression_choices() :
{}
{
complex_regular_expression() ( "|" complex_regular_expression() )*
}
void complex_regular_expression() :
{}
{
( complex_regular_expression_unit() )+
}
void complex_regular_expression_unit() :
{}
{
StringLiteral()
|
"<" identifier() ">"
|
character_list()
|
"(" complex_regular_expression_choices() ")" ( "+" | "*" | "?" )?
}
void character_list() :
{}
{
[ "~" ] "[" [ character_descriptor() ( "," character_descriptor() )* ] "]"
}
void character_descriptor() :
{}
{
StringLiteral() [ "-" StringLiteral() ]
}
void identifier() :
{}
{
}
/**********************************************
* THE JJTREE PRODUCTIONS START HERE *
**********************************************/
void node_descriptor() :
{}
{
"#" ( | )
[
LOOKAHEAD(1)
"(" [ ">" ] node_descriptor_expression() ")"
]
}
JAVACODE
void node_descriptor_expression()
{
Token tok;
int nesting = 1;
while (true) {
tok = getToken(1);
if (tok.kind == 0) {
throw new ParseException();
}
if (tok.kind == LPAREN) nesting++;
if (tok.kind == RPAREN) {
nesting--;
if (nesting == 0) break;
}
tok = getNextToken();
}
}
/**********************************************
* THE JAVA GRAMMAR SPECIFICATION STARTS HERE *
**********************************************/
/*
* The Java grammar is modified to use sequences of tokens
* for the missing tokens - those that include "<<" and ">>".
*/
/*
* The following production defines Java identifiers - it
* includes the reserved words of JavaCC also.
*/
void JavaIdentifier() :
{}
{
| "options"
| "LOOKAHEAD"
| "IGNORE_CASE"
| "PARSER_BEGIN"
| "PARSER_END"
| "JAVACODE"
| "TOKEN"
| "SPECIAL_TOKEN"
| "MORE"
| "SKIP"
| "TOKEN_MGR_DECLS"
| "EOF"
}
/*
* The productions for the missing code follows. Obviously
* these productions accept more than what is legal in Java,
* but that is OK for our purposes.
*/
void ShiftOps() :
{}
{
"<" "<"
|
">" ">" [ ">" ]
}
void OtherAssignmentOps() :
{}
{
"<" "<="
|
">" [ ">" ] ">="
}
/*
* Program structuring syntax follows.
*/
void CompilationUnit() :
/*
* The is deleted since the compilation unit is embedded
* within grammar code. To parse to CompilationUnit, we use
* a special production JavaCompilationUnit below.
*/
{}
{
[ PackageDeclaration() ]
( ImportDeclaration() )*
( TypeDeclaration() )*
}
void JavaCompilationUnit() :
/*
* Use this to parse a Java compilation unit.
*/
{}
{
CompilationUnit()
}
void PackageDeclaration() :
{}
{
"package" Name() ";"
}
void ImportDeclaration() :
{}
{
"import" Name() [ "." "*" ] ";"
}
void TypeDeclaration() :
{}
{
LOOKAHEAD( ( "abstract" | "final" | "public" )* "class" )
ClassDeclaration()
|
InterfaceDeclaration()
|
";"
}
/*
* Declaration syntax follows.
*/
void ClassDeclaration() :
{}
{
( "abstract" | "final" | "public" )*
UnmodifiedClassDeclaration()
}
void UnmodifiedClassDeclaration() :
{}
{
"class" JavaIdentifier() [ "extends" Name() ] [ "implements" NameList() ]
ClassBody()
}
void ClassBody() :
{}
{
"{" ( ClassBodyDeclaration() )* "}"
}
void NestedClassDeclaration() :
{}
{
( "static" | "abstract" | "final" | "public" | "protected" | "private" )*
UnmodifiedClassDeclaration()
}
void ClassBodyDeclaration() :
{}
{
LOOKAHEAD(2)
Initializer()
|
LOOKAHEAD( ( "static" | "abstract" | "final" | "public" | "protected" | "private" )* "class" )
NestedClassDeclaration()
|
LOOKAHEAD( ( "static" | "abstract" | "final" | "public" | "protected" | "private" )* "interface" )
NestedInterfaceDeclaration()
|
LOOKAHEAD( [ "public" | "protected" | "private" ] Name() "(" )
ConstructorDeclaration()
|
LOOKAHEAD( MethodDeclarationLookahead() )
MethodDeclaration()
|
FieldDeclaration()
}
// This production is to determine lookahead only.
void MethodDeclarationLookahead() :
{}
{
( "public" | "protected" | "private" | "static" | "abstract" | "final" | "native" | "synchronized" )*
ResultType() JavaIdentifier() "("
}
void InterfaceDeclaration() :
{}
{
( "abstract" | "public" )*
UnmodifiedInterfaceDeclaration()
}
void NestedInterfaceDeclaration() :
{}
{
( "static" | "abstract" | "final" | "public" | "protected" | "private" )*
UnmodifiedInterfaceDeclaration()
}
void UnmodifiedInterfaceDeclaration() :
{}
{
"interface" JavaIdentifier() [ "extends" NameList() ]
"{" ( InterfaceMemberDeclaration() )* "}"
}
void InterfaceMemberDeclaration() :
{}
{
LOOKAHEAD( ( "static" | "abstract" | "final" | "public" | "protected" | "private" )* "class" )
NestedClassDeclaration()
|
LOOKAHEAD( ( "static" | "abstract" | "final" | "public" | "protected" | "private" )* "interface" )
NestedInterfaceDeclaration()
|
LOOKAHEAD( MethodDeclarationLookahead() )
MethodDeclaration()
|
FieldDeclaration()
}
void FieldDeclaration() :
{}
{
( "public" | "protected" | "private" | "static" | "final" | "transient" | "volatile" )*
Type() VariableDeclarator() ( "," VariableDeclarator() )* ";"
}
void VariableDeclarator() :
{}
{
VariableDeclaratorId() [ "=" VariableInitializer() ]
}
void VariableDeclaratorId() :
{}
{
JavaIdentifier() ( "[" "]" )*
}
void VariableInitializer() :
{}
{
ArrayInitializer()
|
Expression()
}
void ArrayInitializer() :
{}
{
"{" [ VariableInitializer() ( LOOKAHEAD(2) "," VariableInitializer() )* ] [ "," ] "}"
}
void MethodDeclaration() :
{}
{
( "public" | "protected" | "private" | "static" | "abstract" | "final" | "native" | "synchronized" )*
ResultType() MethodDeclarator() [ "throws" NameList() ]
( Block() | ";" )
}
void MethodDeclarator() :
{}
{
JavaIdentifier() FormalParameters() ( "[" "]" )*
}
void FormalParameters() :
{}
{
"(" [ FormalParameter() ( "," FormalParameter() )* ] ")"
}
void FormalParameter() :
{}
{
[ "final" ] Type() VariableDeclaratorId()
}
void ConstructorDeclaration() :
{}
{
[ "public" | "protected" | "private" ]
JavaIdentifier() FormalParameters() [ "throws" NameList() ]
"{"
[ LOOKAHEAD(ExplicitConstructorInvocation()) ExplicitConstructorInvocation() ]
( BlockStatement() )*
"}"
}
void ExplicitConstructorInvocation() :
{}
{
LOOKAHEAD("this" Arguments() ";")
"this" Arguments() ";"
|
[ LOOKAHEAD(2) PrimaryExpression() "." ] "super" Arguments() ";"
}
void Initializer() :
{}
{
[ "static" ] Block()
}
/*
* Type, name and expression syntax follows.
*/
void Type() :
{}
{
( PrimitiveType() | Name() ) ( "[" "]" )*
}
void PrimitiveType() :
{}
{
"boolean"
|
"char"
|
"byte"
|
"short"
|
"int"
|
"long"
|
"float"
|
"double"
}
void ResultType() :
{}
{
"void"
|
Type()
}
void Name() :
/*
* A lookahead of 2 is required below since "Name" can be followed
* by a ".*" when used in the context of an "ImportDeclaration".
*/
{}
{
JavaIdentifier()
( LOOKAHEAD(2) "." JavaIdentifier() )*
}
void NameList() :
{}
{
Name() ( "," Name() )*
}
/*
* Expression syntax follows.
*/
void 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.
*/
{}
{
ConditionalExpression() [ AssignmentOperator() Expression() ]
}
void AssignmentOperator() :
{}
{
"=" | "*=" | "/=" | "%=" | "+=" | "-=" | "&=" | "^=" | "|="
|
OtherAssignmentOps()
}
void ConditionalExpression() :
{}
{
ConditionalOrExpression() [ "?" Expression() ":" ConditionalExpression() ]
}
void ConditionalOrExpression() :
{}
{
ConditionalAndExpression() ( "||" ConditionalAndExpression() )*
}
void ConditionalAndExpression() :
{}
{
InclusiveOrExpression() ( "&&" InclusiveOrExpression() )*
}
void InclusiveOrExpression() :
{}
{
ExclusiveOrExpression() ( "|" ExclusiveOrExpression() )*
}
void ExclusiveOrExpression() :
{}
{
AndExpression() ( "^" AndExpression() )*
}
void AndExpression() :
{}
{
EqualityExpression() ( "&" EqualityExpression() )*
}
void EqualityExpression() :
{}
{
InstanceOfExpression() ( ( "==" | "!=" ) InstanceOfExpression() )*
}
void InstanceOfExpression() :
{}
{
RelationalExpression() [ "instanceof" Type() ]
}
void RelationalExpression() :
{}
{
/*
* The lookahead of 2 below is due to the fact that we have split
* the shift and shift assignment operator into multiple tokens that
* now clash with these tokens.
*/
ShiftExpression() ( LOOKAHEAD(2) ( "<" | ">" | "<=" | ">=" ) ShiftExpression() )*
}
void ShiftExpression() :
{}
{
/*
* The lookahead of 3 below is due to the fact that we have split
* the shift and shift assignment operator into multiple tokens that
* now clash with these tokens and the relational operators.
*/
AdditiveExpression() ( LOOKAHEAD(3) ( ShiftOps() ) AdditiveExpression() )*
}
void AdditiveExpression() :
{}
{
MultiplicativeExpression() ( ( "+" | "-" ) MultiplicativeExpression() )*
}
void MultiplicativeExpression() :
{}
{
UnaryExpression() ( ( "*" | "/" | "%" ) UnaryExpression() )*
}
void UnaryExpression() :
{}
{
( "+" | "-" ) UnaryExpression()
|
PreIncrementExpression()
|
PreDecrementExpression()
|
UnaryExpressionNotPlusMinus()
}
void PreIncrementExpression() :
{}
{
"++" PrimaryExpression()
}
void PreDecrementExpression() :
{}
{
"--" PrimaryExpression()
}
void UnaryExpressionNotPlusMinus() :
{}
{
( "~" | "!" ) UnaryExpression()
|
LOOKAHEAD( CastLookahead() )
CastExpression()
|
PostfixExpression()
}
// 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("(" Name() "[")
"(" Name() "[" "]"
|
"(" Name() ")" ( "~" | "!" | "(" | JavaIdentifier() | "this" | "super" | "new" | Literal() )
}
void PostfixExpression() :
{}
{
PrimaryExpression() [ "++" | "--" ]
}
void CastExpression() :
{}
{
LOOKAHEAD("(" PrimitiveType())
"(" Type() ")" UnaryExpression()
|
LOOKAHEAD("(" Name())
"(" Type() ")" UnaryExpressionNotPlusMinus()
}
void PrimaryExpression() :
{}
{
PrimaryPrefix() ( LOOKAHEAD(2) PrimarySuffix() )*
}
void PrimaryPrefix() :
{}
{
Literal()
|
"this"
|
"super" "." JavaIdentifier()
|
"(" Expression() ")"
|
AllocationExpression()
|
LOOKAHEAD( ResultType() "." "class" )
ResultType() "." "class"
|
Name()
}
void PrimarySuffix() :
{}
{
LOOKAHEAD(2)
"." "this"
|
LOOKAHEAD(2)
"." AllocationExpression()
|
"[" Expression() "]"
|
"." JavaIdentifier()
|
Arguments()
}
void Literal() :
{}
{
|
|
|
|
BooleanLiteral()
|
NullLiteral()
}
void IntegerLiteral() :
{}
{
}
void BooleanLiteral() :
{}
{
"true"
|
"false"
}
void StringLiteral() :
{}
{
}
void NullLiteral() :
{}
{
"null"
}
void Arguments() :
{}
{
"(" [ ArgumentList() ] ")"
}
void ArgumentList() :
{}
{
Expression() ( "," Expression() )*
}
void AllocationExpression() :
{}
{
LOOKAHEAD(2)
"new" PrimitiveType() ArrayDimsAndInits()
|
"new" Name()
(
ArrayDimsAndInits()
|
Arguments() [ ClassBody() ]
)
}
/*
* The second LOOKAHEAD specification below is to parse to PrimarySuffix
* if there is an expression between the "[...]".
*/
void ArrayDimsAndInits() :
{}
{
LOOKAHEAD(2)
( LOOKAHEAD(2) "[" Expression() "]" )+ ( LOOKAHEAD(2) "[" "]" )*
|
( "[" "]" )+ ArrayInitializer()
}
/*
* Statement syntax follows.
*/
void Statement() :
{}
{
LOOKAHEAD(2)
LabeledStatement()
|
Block()
|
EmptyStatement()
|
StatementExpression() ";"
|
SwitchStatement()
|
IfStatement()
|
WhileStatement()
|
DoStatement()
|
ForStatement()
|
BreakStatement()
|
ContinueStatement()
|
ReturnStatement()
|
ThrowStatement()
|
SynchronizedStatement()
|
TryStatement()
}
void LabeledStatement() :
{}
{
JavaIdentifier() ":" Statement()
}
void Block() :
{}
{
"{" ( BlockStatement() )* "}"
}
void BlockStatement() :
{}
{
LOOKAHEAD([ "final" ] Type() JavaIdentifier())
LocalVariableDeclaration() ";"
|
Statement()
|
UnmodifiedClassDeclaration()
|
UnmodifiedInterfaceDeclaration()
}
void LocalVariableDeclaration() :
{}
{
[ "final" ] Type() VariableDeclarator() ( "," VariableDeclarator() )*
}
void EmptyStatement() :
{}
{
";"
}
void 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.
*/
{}
{
PreIncrementExpression()
|
PreDecrementExpression()
|
PrimaryExpression()
[
"++"
|
"--"
|
AssignmentOperator() Expression()
]
}
void SwitchStatement() :
{}
{
"switch" "(" Expression() ")" "{"
( SwitchLabel() ( BlockStatement() )* )*
"}"
}
void SwitchLabel() :
{}
{
"case" Expression() ":"
|
"default" ":"
}
void 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.
*/
{}
{
"if" "(" Expression() ")" Statement() [ LOOKAHEAD(1) "else" Statement() ]
}
void WhileStatement() :
{}
{
"while" "(" Expression() ")" Statement()
}
void DoStatement() :
{}
{
"do" Statement() "while" "(" Expression() ")" ";"
}
void ForStatement() :
{}
{
"for" "(" [ ForInit() ] ";" [ Expression() ] ";" [ ForUpdate() ] ")" Statement()
}
void ForInit() :
{}
{
LOOKAHEAD( [ "final" ] Type() JavaIdentifier() )
LocalVariableDeclaration()
|
StatementExpressionList()
}
void StatementExpressionList() :
{}
{
StatementExpression() ( "," StatementExpression() )*
}
void ForUpdate() :
{}
{
StatementExpressionList()
}
void BreakStatement() :
{}
{
"break" [ JavaIdentifier() ] ";"
}
void ContinueStatement() :
{}
{
"continue" [ JavaIdentifier() ] ";"
}
void ReturnStatement() :
{}
{
"return" [ Expression() ] ";"
}
void ThrowStatement() :
{}
{
"throw" Expression() ";"
}
void SynchronizedStatement() :
{}
{
"synchronized" "(" Expression() ")" Block()
}
void TryStatement() :
/*
* Semantic check required here to make sure that at least one
* finally/catch is present.
*/
{}
{
"try" Block()
( "catch" "(" FormalParameter() ")" Block() )*
[ "finally" Block() ]
}