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javacc-7.0.3.www.doc.JavaCC.txt Maven / Gradle / Ivy

DOCUMENT START
TOKENS
/**********************************************
 * THE JAVACC TOKEN SPECIFICATION STARTS HERE *
 **********************************************/

/* JAVACC RESERVED WORDS: These are the only tokens in JavaCC but not in Java */ TOKEN : {
<_LOOKAHEAD: "LOOKAHEAD">
| <_IGNORE_CASE: "IGNORE_CASE">
| <_PARSER_BEGIN: "PARSER_BEGIN">
| <_PARSER_END: "PARSER_END">
| <_JAVACODE: "JAVACODE">
| <_CPPCODE: "CPPCODE">
| <_TOKEN: "TOKEN">
| <_SPECIAL_TOKEN: "SPECIAL_TOKEN">
| <_MORE: "MORE">
| <_SKIP: "SKIP">
| <_TOKEN_MGR_DECLS: "TOKEN_MGR_DECLS">
| <_EOF: "EOF">
| <_DCL_PARSER_BEGIN: "DCL_PARSER_BEGIN">
| <_DCL_PARSER_END: "DCL_PARSER_END">
| <_INC_PARSER_BEGIN: "INC_PARSER_BEGIN">
| <_INC_PARSER_END: "INC_PARSER_END">
| <_DEF_PARSER_BEGIN: "DEF_PARSER_BEGIN">
| <_DEF_PARSER_END: "DEF_PARSER_END">
}

/*
 * 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"
| "/*@egen*/" : AFTER_EGEN
}

 SKIP : {
<~[]> : DEFAULT
}

/* COMMENTS */ MORE : {
"//" : IN_SINGLE_LINE_COMMENT
| <"/**" ~["/"]> : IN_FORMAL_COMMENT
| "/*" : IN_MULTI_LINE_COMMENT
| "/*@bgen(jjtree" : IN_MULTI_LINE_COMMENT
}

 SPECIAL : {
 : DEFAULT
}

 SPECIAL : {
 : DEFAULT
}

 SPECIAL : {
 : DEFAULT
}

 MORE : {
<~[]>
}

/* JAVA RESERVED WORDS AND LITERALS */ TOKEN : {

| 
| 
| 
| 
| 
| 
| 
| 
| 
| 
| <_DEFAULT: "default">
| 
| 
| 
| 
| 
| 
| 
| 
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| 
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| 
| 
| 
| 
| 
}

/* C++ RESERVED WORDS AND LITERALS */ TOKEN : {

| 
}

/* JAVA LITERALS */ TOKEN : {
 (["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"])*>
|  | >
| <#DECIMAL_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"]>
| <#DECIMAL_EXPONENT: ["e","E"] (["+","-"])? (["0"-"9"])+>
| <#HEXADECIMAL_FLOATING_POINT_LITERAL: "0" ["x","X"] (["0"-"9","a"-"f","A"-"F"])+ (".")?  (["f","F","d","D"])? | "0" ["x","X"] (["0"-"9","a"-"f","A"-"F"])* "." (["0"-"9","a"-"f","A"-"F"])+  (["f","F","d","D"])?>
| <#HEXADECIMAL_EXPONENT: ["p","P"] (["+","-"])? (["0"-"9"])+>
| 
| 
}

/* SEPARATORS */ TOKEN : {

| 
| 
| 
| 
| 
| 
| 
| 
}

/* OPERATORS */ TOKEN : {

| 
| 
| 
| 
| 
| 
| =">
| 
| 
| 
| 
| 
| 
| 
| 
| 
| 
| 
| 
| 
| >>"> : {
| >"> : {
| ">
}

/* IDENTIFIERS */ TOKEN : {
 ()*>
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| <#PART_LETTER: 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212a"-"\u212d","\u212f"-"\u2131","\u2133"-"\u2139","\u2160"-"\u2183","\u3005"-"\u3007","\u3021"-"\u302f","\u3031"-"\u3035","\u3038"-"\u303a","\u3041"-"\u3094","\u3099"-"\u309a","\u309d"-"\u309e","\u30a1"-"\u30fe","\u3105"-"\u312c","\u3131"-"\u318e","\u31a0"-"\u31b7","\u3400"-"\u4db5","\u4e00"-"\u9fa5","\ua000"-"\ua48c","\uac00"-"\ud7a3","\uf900"-"\ufa2d","\ufb00"-"\ufb06","\ufb13"-"\ufb17","\ufb1d"-"\ufb28","\ufb2a"-"\ufb36","\ufb38"-"\ufb3c","\ufb3e","\ufb40"-"\ufb41","\ufb43"-"\ufb44","\ufb46"-"\ufbb1","\ufbd3"-"\ufd3d","\ufd50"-"\ufd8f","\ufd92"-"\ufdc7","\ufdf0"-"\ufdfb","\ufe20"-"\ufe23","\ufe33"-"\ufe34","\ufe4d"-"\ufe4f","\ufe69","\ufe70"-"\ufe72","\ufe74","\ufe76"-"\ufefc","\ufeff","\uff04","\uff10"-"\uff19","\uff21"-"\uff3a","\uff3f","\uff41"-"\uff5a","\uff65"-"\uffbe","\uffc2"-"\uffc7","\uffca"-"\uffcf","\uffd2"-"\uffd7","\uffda"-"\uffdc","\uffe0"-"\uffe1","\uffe5"-"\uffe6","\ufff9"-"\ufffb"]>
}

 TOKEN : {

}

NON-TERMINALS
/************************************************
 * THE JAVACC GRAMMAR SPECIFICATION STARTS HERE *
 ************************************************/	javacc_input	:=	javacc_options "PARSER_BEGIN" "(" identifier ")" CompilationUnit "PARSER_END" "(" identifier ")" ( production )+ 
	javacc_options	:=	(  "{" ( option_binding )* "}" )?
	option_binding	:=	(  | "LOOKAHEAD" | "IGNORE_CASE" | "static" | "PARSER_BEGIN" ) "=" ( IntegerLiteral | BooleanLiteral | StringLiteral | StringList ) ";"
	StringList	:=	"(" StringLiteral ( "," StringLiteral )* ")"
	production	:=	javacode_production
		|	cppcode_production
		|	regular_expr_production
		|	token_manager_decls
		|	bnf_production
	javacode_production	:=	"JAVACODE" AccessModifier ResultType identifier FormalParameters ( "throws" Name ( "," Name )* )? Block
	cppcode_production	:=	"CPPCODE" AccessModifier ResultType identifier FormalParameters ( "throws" Name ( "," Name )* )? Block
	bnf_production	:=	AccessModifier ResultType identifier FormalParameters ( "throws" Name ( "," Name )* )? ":" Block "{" expansion_choices "}"
	AccessModifier	:=	( "public" | "protected" | "private" )?
	regular_expr_production	:=	( "<" "*" ">" | "<"  ( ","  )* ">" )? regexpr_kind ( "[" "IGNORE_CASE" "]" )? ":" "{" regexpr_spec ( "|" regexpr_spec )* "}"
	token_manager_decls	:=	"TOKEN_MGR_DECLS" ":" ( ClassOrInterfaceBody )?
	regexpr_kind	:=	"TOKEN"
		|	"SPECIAL_TOKEN"
		|	"SKIP"
		|	"MORE"
	regexpr_spec	:=	regular_expression ( Block )? ( ":"  )?
	expansion_choices	:=	expansion ( "|" expansion )*
	expansion	:=	( "LOOKAHEAD" "(" local_lookahead ")" )? ( expansion_unit )+
	local_lookahead	:=	( IntegerLiteral )? ( "," )? ( expansion_choices )? ( "," )? ( "{" ( Expression )? "}" )?
	expansion_unit	:=	"LOOKAHEAD" "(" local_lookahead ")"
		|	Block
		|	"[" expansion_choices "]"
		|	"try" "{" expansion_choices "}" ( "catch" "(" ( Name  )? ")" Block )* ( "finally" Block )?
		|	( PrimaryExpression "=" )? ( identifier ( TypeArguments )? Arguments | regular_expression ( "."  )? )
		|	"(" expansion_choices ")" ( "+" | "*" | "?" )?
	regular_expression	:=	StringLiteral
		|	 ( ( "#" )? identifier ":" )? complex_regular_expression_choices ">
		|	"<" identifier ">"
		|	"<" "EOF" ">"
	complex_regular_expression_choices	:=	complex_regular_expression ( "|" complex_regular_expression )*
	complex_regular_expression	:=	( complex_regular_expression_unit )+
	complex_regular_expression_unit	:=	StringLiteral
		|	"<" identifier ">"
		|	character_list
		|	"(" complex_regular_expression_choices ")" ( "+" | "*" | "?" | "{" IntegerLiteral ( "," ( IntegerLiteral )? )? "}" )?
	character_list	:=	( "~" )? "[" ( character_descriptor ( "," character_descriptor )* )? "]"
	character_descriptor	:=	StringLiteral ( "-" StringLiteral )?
	identifier	:=	
/**********************************************
 * 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.
 */	JavaIdentifier	:=	(  | "LOOKAHEAD" | "IGNORE_CASE" | "PARSER_BEGIN" | "PARSER_END" | "JAVACODE" | "TOKEN" | "SPECIAL_TOKEN" | "MORE" | "SKIP" | "TOKEN_MGR_DECLS" | "EOF" | "DCL_PARSER_BEGIN" | "DCL_PARSER_END" | "INC_PARSER_BEGIN" | "INC_PARSER_END" | "DEF_PARSER_BEGIN" | "DEF_PARSER_END" )
/*
 * Program structuring syntax follows.
 */	CompilationUnit	:=	( PackageDeclaration )? ( ImportDeclaration )* ( TypeDeclaration )*
	PackageDeclaration	:=	Modifiers "package" Name ";"
	ImportDeclaration	:=	"import" ( "static" )? Name ( "." "*" )? ";"
/*
 * 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.
 */	Modifiers	:=	( ( "public" | "static" | "protected" | "private" | "final" | "abstract" | "synchronized" | "native" | "transient" | "volatile" | "strictfp" | Annotation ) )*
/*
 * Declaration syntax follows.
 */	TypeDeclaration	:=	";"
		|	Modifiers ( ClassOrInterfaceDeclaration | EnumDeclaration | AnnotationTypeDeclaration )
	ClassOrInterfaceDeclaration	:=	( "class" | "interface" )  ( TypeParameters )? ( ExtendsList )? ( ImplementsList )? ClassOrInterfaceBody
	ExtendsList	:=	"extends" ClassOrInterfaceType ( "," ClassOrInterfaceType )*
	ImplementsList	:=	"implements" ClassOrInterfaceType ( "," ClassOrInterfaceType )*
	EnumDeclaration	:=	"enum"  ( ImplementsList )? EnumBody
	EnumBody	:=	"{" ( EnumConstant ( "," EnumConstant )* )? ( "," )? ( ";" ( ClassOrInterfaceBodyDeclaration )* )? "}"
	EnumConstant	:=	Modifiers  ( Arguments )? ( ClassOrInterfaceBody )?
	TypeParameters	:=	"<" TypeParameter ( "," TypeParameter )* ">"
	TypeParameter	:=	 ( TypeBound )?
	TypeBound	:=	"extends" ClassOrInterfaceType ( "&" ClassOrInterfaceType )*
	ClassOrInterfaceBody	:=	"{" ( ClassOrInterfaceBodyDeclaration )* "}"
	ClassOrInterfaceBodyDeclaration	:=	Initializer
		|	Modifiers ( ClassOrInterfaceDeclaration | EnumDeclaration | ConstructorDeclaration | FieldDeclaration | MethodDeclaration )
		|	";"
	FieldDeclaration	:=	Type VariableDeclarator ( "," VariableDeclarator )* ";"
	VariableDeclarator	:=	VariableDeclaratorId ( "=" VariableInitializer )?
	VariableDeclaratorId	:=	 ( "[" "]" )*
	VariableInitializer	:=	ArrayInitializer
		|	Expression
	ArrayInitializer	:=	"{" ( VariableInitializer ( "," VariableInitializer )* )? ( "," )? "}"
	MethodDeclaration	:=	( TypeParameters )? ResultType MethodDeclarator ( "throws" NameList )? ( Block | ";" )
	MethodDeclarator	:=	 FormalParameters ( "[" "]" )*
	FormalParameters	:=	"(" ( FormalParameter ( "," FormalParameter )* )? ")"
	FormalParameter	:=	Modifiers Type ( ( "&" | "*" ) | "..." )? VariableDeclaratorId
	ConstructorDeclaration	:=	( TypeParameters )?  FormalParameters ( "throws" NameList )? "{" ( ExplicitConstructorInvocation )? ( BlockStatement )* "}"
	ExplicitConstructorInvocation	:=	"this" Arguments ";"
		|	( PrimaryExpression "." )? "super" Arguments ";"
	Initializer	:=	( "static" )? Block
/*
 * Type, name and expression syntax follows.
 */	Type	:=	ReferenceType
		|	PrimitiveType
	ReferenceType	:=	PrimitiveType ( "[" "]" )+
		|	( ( Template )? ClassOrInterfaceType ) ( "[" "]" )*
	Template	:=	"template" "<" TemplateBase ( "," TemplateBase )* ">"
	TemplateBase	:=	TemplatePack ( "..." )? 
	TemplatePack	:=	( "class" | "typename" )
	ClassOrInterfaceType	:=	 ( TypeArguments )? ( ( "." | "::" )  ( TypeArguments )? )*
	TypeArguments	:=	"<" TypeArgument ( "," TypeArgument ( "..." )? )* ">"
	TypeArgument	:=	ReferenceType
		|	"?" ( WildcardBounds )?
	WildcardBounds	:=	"extends" ReferenceType
		|	"super" ReferenceType
	PrimitiveType	:=	"boolean"
		|	"char"
		|	"byte"
		|	"short"
		|	"int"
		|	"long"
		|	"float"
		|	"double"
	ResultType	:=	( "void" ( "*" )? | ( "const" )? Type ( "*" | "&" )? )
	Name	:=	JavaIdentifier ( "." JavaIdentifier )*
	NameList	:=	Name ( "," Name )*
/*
 * Expression syntax follows.
 */	Expression	:=	ConditionalExpression ( AssignmentOperator Expression )?
	AssignmentOperator	:=	"="
		|	"*="
		|	"/="
		|	"%="
		|	"+="
		|	"-="
		|	"<<="
		|	">>="
		|	">>>="
		|	"&="
		|	"^="
		|	"|="
	ConditionalExpression	:=	ConditionalOrExpression ( "?" Expression ":" Expression )?
	ConditionalOrExpression	:=	ConditionalAndExpression ( "||" ConditionalAndExpression )*
	ConditionalAndExpression	:=	InclusiveOrExpression ( "&&" InclusiveOrExpression )*
	InclusiveOrExpression	:=	ExclusiveOrExpression ( "|" ExclusiveOrExpression )*
	ExclusiveOrExpression	:=	AndExpression ( "^" AndExpression )*
	AndExpression	:=	EqualityExpression ( "&" EqualityExpression )*
	EqualityExpression	:=	InstanceOfExpression ( ( "==" | "!=" ) InstanceOfExpression )*
	InstanceOfExpression	:=	RelationalExpression ( "instanceof" Type )?
	RelationalExpression	:=	ShiftExpression ( ( "<" | ">" | "<=" | ">=" ) ShiftExpression )*
	ShiftExpression	:=	AdditiveExpression ( ( "<<" | RSIGNEDSHIFT | RUNSIGNEDSHIFT ) AdditiveExpression )*
	AdditiveExpression	:=	MultiplicativeExpression ( ( "+" | "-" ) MultiplicativeExpression )*
	MultiplicativeExpression	:=	UnaryExpression ( ( "*" | "/" | "%" ) UnaryExpression )*
	UnaryExpression	:=	( "+" | "-" ) UnaryExpression
		|	PreIncrementExpression
		|	PreDecrementExpression
		|	UnaryExpressionNotPlusMinus
	PreIncrementExpression	:=	"++" PrimaryExpression
	PreDecrementExpression	:=	"--" PrimaryExpression
	UnaryExpressionNotPlusMinus	:=	( "~" | "!" ) UnaryExpression
		|	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.
	CastLookahead	:=	"(" PrimitiveType
		|	"(" Type "[" "]"
		|	"(" Type ")" ( "~" | "!" | "(" |  | "this" | "super" | "new" | Literal )
	PostfixExpression	:=	PrimaryExpression ( "++" | "--" )?
	CastExpression	:=	"(" Type ")" UnaryExpression
		|	"(" Type ")" UnaryExpressionNotPlusMinus
	PrimaryExpression	:=	PrimaryPrefix ( PrimarySuffix )*
	MemberSelector	:=	"." TypeArguments 
	PrimaryPrefix	:=	Literal
		|	"this"
		|	"super" "." 
		|	"(" Expression ")"
		|	AllocationExpression
		|	ResultType "." "class"
		|	Name
	PrimarySuffix	:=	"." "this"
		|	"." AllocationExpression
		|	MemberSelector
		|	"[" Expression "]"
		|	"." 
		|	Arguments
	Literal	:=	
		|	
		|	
		|	
		|	BooleanLiteral
		|	NullLiteral
	IntegerLiteral	:=	
	BooleanLiteral	:=	"true"
		|	"false"
	StringLiteral	:=	
	NullLiteral	:=	"null"
	Arguments	:=	"(" ( ArgumentList )? ")"
	ArgumentList	:=	Expression ( "," Expression )*
	AllocationExpression	:=	"new" PrimitiveType ArrayDimsAndInits
		|	"new" ClassOrInterfaceType ( TypeArguments )? ( ArrayDimsAndInits | Arguments ( ClassOrInterfaceBody )? )
/*
 * The third LOOKAHEAD specification below is to parse to PrimarySuffix
 * if there is an expression between the "[...]".
 */	ArrayDimsAndInits	:=	( "[" Expression "]" )+ ( "[" "]" )*
		|	( "[" "]" )+ ArrayInitializer
/*
 * Statement syntax follows.
 */	Statement	:=	LabeledStatement
		|	AssertStatement
		|	Block
		|	EmptyStatement
		|	StatementExpression ";"
		|	SwitchStatement
		|	IfStatement
		|	WhileStatement
		|	DoStatement
		|	ForStatement
		|	BreakStatement
		|	ContinueStatement
		|	ReturnStatement
		|	ThrowStatement
		|	SynchronizedStatement
		|	TryStatement
	AssertStatement	:=	"assert" Expression ( ":" Expression )? ";"
	LabeledStatement	:=	 ":" Statement
	Block	:=	"{" ( BlockStatement )* "}"
	BlockStatement	:=	LocalVariableDeclaration ";"
		|	Statement
		|	ClassOrInterfaceDeclaration
	LocalVariableDeclaration	:=	Modifiers Type VariableDeclarator ( "," VariableDeclarator )*
	EmptyStatement	:=	";"
	StatementExpression	:=	PreIncrementExpression
		|	PreDecrementExpression
		|	PrimaryExpression ( "++" | "--" | AssignmentOperator Expression )?
	SwitchStatement	:=	"switch" "(" Expression ")" "{" ( SwitchLabel ( BlockStatement )* )* "}"
	SwitchLabel	:=	"case" Expression ":"
		|	"default" ":"
	IfStatement	:=	"if" "(" Expression ")" Statement ( "else" Statement )?
	WhileStatement	:=	"while" "(" Expression ")" Statement
	DoStatement	:=	"do" Statement "while" "(" Expression ")" ";"
	ForStatement	:=	"for" "(" ( Modifiers Type  ":" Expression | ( ForInit )? ";" ( Expression )? ";" ( ForUpdate )? ) ")" Statement
	ForInit	:=	LocalVariableDeclaration
		|	StatementExpressionList
	StatementExpressionList	:=	StatementExpression ( "," StatementExpression )*
	ForUpdate	:=	StatementExpressionList
	BreakStatement	:=	"break" (  )? ";"
	ContinueStatement	:=	"continue" (  )? ";"
	ReturnStatement	:=	"return" ( Expression )? ";"
	ThrowStatement	:=	"throw" Expression ";"
	SynchronizedStatement	:=	"synchronized" "(" Expression ")" Block
	TryStatement	:=	"try" Block ( "catch" "(" FormalParameter ")" Block )* ( "finally" Block )?
/* We use productions to match >>>, >> and > so that we can keep the
 * type declaration syntax with generics clean
 */	RUNSIGNEDSHIFT	:=	( ">" ">" ">" )
	RSIGNEDSHIFT	:=	( ">" ">" )
/* Annotation syntax follows. */	Annotation	:=	NormalAnnotation
		|	SingleMemberAnnotation
		|	MarkerAnnotation
	NormalAnnotation	:=	"@" Name "(" ( MemberValuePairs )? ")"
	MarkerAnnotation	:=	"@" Name
	SingleMemberAnnotation	:=	"@" Name "(" MemberValue ")"
	MemberValuePairs	:=	MemberValuePair ( "," MemberValuePair )*
	MemberValuePair	:=	 "=" MemberValue
	MemberValue	:=	Annotation
		|	MemberValueArrayInitializer
		|	ConditionalExpression
	MemberValueArrayInitializer	:=	"{" MemberValue ( "," MemberValue )* ( "," )? "}"
/* Annotation Types. */	AnnotationTypeDeclaration	:=	"@" "interface"  AnnotationTypeBody
	AnnotationTypeBody	:=	"{" ( AnnotationTypeMemberDeclaration )* "}"
	AnnotationTypeMemberDeclaration	:=	Modifiers ( Type  "(" ")" ( DefaultValue )? ";" | ClassOrInterfaceDeclaration | EnumDeclaration | AnnotationTypeDeclaration | FieldDeclaration )
		|	( ";" )
	DefaultValue	:=	"default" MemberValue

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