/
java1.5.g
1869 lines (1645 loc) · 50.9 KB
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java1.5.g
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header {
}
/** Java 1.5 Recognizer
/** Java 1.5 Recognizer
*
* Run 'java Main [-showtree] directory-full-of-java-files'
*
* [The -showtree option pops up a Swing frame that shows
* the AST constructed from the parser.]
*
* Run 'java Main <directory full of java files>'
*
* Contributing authors:
* John Mitchell johnm@non.net
* Terence Parr parrt@magelang.com
* John Lilley jlilley@empathy.com
* Scott Stanchfield thetick@magelang.com
* Markus Mohnen mohnen@informatik.rwth-aachen.de
* Peter Williams pete.williams@sun.com
* Allan Jacobs Allan.Jacobs@eng.sun.com
* Steve Messick messick@redhills.com
* John Pybus john@pybus.org
* Scott Wisniewski scottdw2@gmail.com
*
* Version 1.00 December 9, 1997 -- initial release
* Version 1.01 December 10, 1997
* fixed bug in octal def (0..7 not 0..8)
* Version 1.10 August 1998 (parrt)
* added tree construction
* fixed definition of WS,comments for mac,pc,unix newlines
* added unary plus
* Version 1.11 (Nov 20, 1998)
* Added "shutup" option to turn off last ambig warning.
* Fixed inner class def to allow named class defs as statements
* synchronized requires compound not simple statement
* add [] after builtInType DOT class in primaryExpression
* "const" is reserved but not valid..removed from modifiers
* Version 1.12 (Feb 2, 1999)
* Changed LITERAL_xxx to xxx in tree grammar.
* Updated java.g to use tokens {...} now for 2.6.0 (new feature).
*
* Version 1.13 (Apr 23, 1999)
* Didn't have (stat)? for else clause in tree parser.
* Didn't gen ASTs for interface extends. Updated tree parser too.
* Updated to 2.6.0.
* Version 1.14 (Jun 20, 1999)
* Allowed final/abstract on local classes.
* Removed local interfaces from methods
* Put instanceof precedence where it belongs...in relationalExpr
* It also had expr not type as arg; fixed it.
* Missing ! on SEMI in classBlock
* fixed: (expr) + "string" was parsed incorrectly (+ as unary plus).
* fixed: didn't like Object[].class in parser or tree parser
* Version 1.15 (Jun 26, 1999)
* Screwed up rule with instanceof in it. :( Fixed.
* Tree parser didn't like (expr).something; fixed.
* Allowed multiple inheritance in tree grammar. oops.
* Version 1.16 (August 22, 1999)
* Extending an interface built a wacky tree: had extra EXTENDS.
* Tree grammar didn't allow multiple superinterfaces.
* Tree grammar didn't allow empty var initializer: {}
* Version 1.17 (October 12, 1999)
* ESC lexer rule allowed 399 max not 377 max.
* java.tree.g didn't handle the expression of synchronized
* statements.
* Version 1.18 (August 12, 2001)
* Terence updated to Java 2 Version 1.3 by
* observing/combining work of Allan Jacobs and Steve
* Messick. Handles 1.3 src. Summary:
* o primary didn't include boolean.class kind of thing
* o constructor calls parsed explicitly now:
* see explicitConstructorInvocation
* o add strictfp modifier
* o missing objBlock after new expression in tree grammar
* o merged local class definition alternatives, moved after declaration
* o fixed problem with ClassName.super.field
* o reordered some alternatives to make things more efficient
* o long and double constants were not differentiated from int/float
* o whitespace rule was inefficient: matched only one char
* o add an examples directory with some nasty 1.3 cases
* o made Main.java use buffered IO and a Reader for Unicode support
* o supports UNICODE?
* Using Unicode charVocabulay makes code file big, but only
* in the bitsets at the end. I need to make ANTLR generate
* unicode bitsets more efficiently.
* Version 1.19 (April 25, 2002)
* Terence added in nice fixes by John Pybus concerning floating
* constants and problems with super() calls. John did a nice
* reorg of the primary/postfix expression stuff to read better
* and makes f.g.super() parse properly (it was METHOD_CALL not
* a SUPER_CTOR_CALL). Also:
*
* o "finally" clause was a root...made it a child of "try"
* o Added stuff for asserts too for Java 1.4, but *commented out*
* as it is not backward compatible.
*
* Version 1.20 (October 27, 2002)
*
* Terence ended up reorging John Pybus' stuff to
* remove some nondeterminisms and some syntactic predicates.
* Note that the grammar is stricter now; e.g., this(...) must
* be the first statement.
*
* Trinary ?: operator wasn't working as array name:
* (isBig ? bigDigits : digits)[i];
*
* Checked parser/tree parser on source for
* Resin-2.0.5, jive-2.1.1, jdk 1.3.1, Lucene, antlr 2.7.2a4,
* and the 110k-line jGuru server source.
*
* Version 1.21 (October 17, 2003)
* Fixed lots of problems including:
* Ray Waldin: add typeDefinition to interfaceBlock in java.tree.g
* He found a problem/fix with floating point that start with 0
* Ray also fixed problem that (int.class) was not recognized.
* Thorsten van Ellen noticed that \n are allowed incorrectly in strings.
* TJP fixed CHAR_LITERAL analogously.
*
* Version 1.21.2 (March, 2003)
* Changes by Matt Quail to support generics (as per JDK1.5/JSR14)
* Notes:
* o We only allow the "extends" keyword and not the "implements"
* keyword, since thats what JSR14 seems to imply.
* o Thanks to Monty Zukowski for his help on the antlr-interest
* mail list.
* o Thanks to Alan Eliasen for testing the grammar over his
* Fink source base
*
* Version 1.22 (July, 2004)
* Changes by Michael Studman to support Java 1.5 language extensions
* Notes:
* o Added support for annotations types
* o Finished off Matt Quail's generics enhancements to support bound type arguments
* o Added support for new for statement syntax
* o Added support for static import syntax
* o Added support for enum types
* o Tested against JDK 1.5 source base and source base of jdigraph project
* o Thanks to Matt Quail for doing the hard part by doing most of the generics work
*
* Version 1.22.1 (July 28, 2004)
* Bug/omission fixes for Java 1.5 language support
* o Fixed tree structure bug with classOrInterface - thanks to Pieter Vangorpto for
* spotting this
* o Fixed bug where incorrect handling of SR and BSR tokens would cause type
* parameters to be recognised as type arguments.
* o Enabled type parameters on constructors, annotations on enum constants
* and package definitions
* o Fixed problems when parsing if ((char.class.equals(c))) {} - solution by Matt Quail at Cenqua
*
* Version 1.22.2 (July 28, 2004)
* Slight refactoring of Java 1.5 language support
* o Refactored for/"foreach" productions so that original literal "for" literal
* is still used but the for sub-clauses vary by token type
* o Fixed bug where type parameter was not included in generic constructor's branch of AST
*
* Version 1.22.3 (August 26, 2004)
* Bug fixes as identified by Michael Stahl; clean up of tabs/spaces
* and other refactorings
* o Fixed typeParameters omission in identPrimary and newStatement
* o Replaced GT reconcilliation code with simple semantic predicate
* o Adapted enum/assert keyword checking support from Michael Stahl's java15 grammar
* o Refactored typeDefinition production and field productions to reduce duplication
*
* Version 1.22.4 (October 21, 2004)
* Small bux fixes
* o Added typeArguments to explicitConstructorInvocation, e.g. new <String>MyParameterised()
* o Added typeArguments to postfixExpression productions for anonymous inner class super
* constructor invocation, e.g. new Outer().<String>super()
* o Fixed bug in array declarations identified by Geoff Roy
*
* Version 1.22.5 (January 03, 2005)
* Small change to tree structure
* o Flattened classOrInterfaceType tree so IDENT no longer has children. TYPE_ARGUMENTS are now
* always siblings of IDENT rather than children. Fully.qualified.names trees now
* look a little less clean when TYPE_ARGUMENTS are present though.
* Version 1.22.6 (March 3, 2005)
* Modified the IDENT rule to be conformant with the specification.
* Eliminated unicode escapes from the ESC rule. These need to be
* handled by a preprocessor because, according to the langauge spec,
* they can appear anywhere in the input, not just inside of strings.
*
* This grammar is in the PUBLIC DOMAIN
*/
class JavaRecognizer extends Parser;
options {
k = 2; // two token lookahead
exportVocab=Java; // Call its vocabulary "Java"
codeGenMakeSwitchThreshold = 2; // Some optimizations
codeGenBitsetTestThreshold = 3;
defaultErrorHandler = false; // Don't generate parser error handlers
buildAST = true;
}
tokens {
BLOCK; MODIFIERS; OBJBLOCK; SLIST; CTOR_DEF; METHOD_DEF; VARIABLE_DEF;
INSTANCE_INIT; STATIC_INIT; TYPE; CLASS_DEF; INTERFACE_DEF;
PACKAGE_DEF; ARRAY_DECLARATOR; EXTENDS_CLAUSE; IMPLEMENTS_CLAUSE;
PARAMETERS; PARAMETER_DEF; LABELED_STAT; TYPECAST; INDEX_OP;
POST_INC; POST_DEC; METHOD_CALL; EXPR; ARRAY_INIT;
IMPORT; UNARY_MINUS; UNARY_PLUS; CASE_GROUP; ELIST; FOR_INIT; FOR_CONDITION;
FOR_ITERATOR; EMPTY_STAT; FINAL="final"; ABSTRACT="abstract";
STRICTFP="strictfp"; SUPER_CTOR_CALL; CTOR_CALL; VARIABLE_PARAMETER_DEF;
STATIC_IMPORT; ENUM_DEF; ENUM_CONSTANT_DEF; FOR_EACH_CLAUSE; ANNOTATION_DEF; ANNOTATIONS;
ANNOTATION; ANNOTATION_MEMBER_VALUE_PAIR; ANNOTATION_FIELD_DEF; ANNOTATION_ARRAY_INIT;
TYPE_ARGUMENTS; TYPE_ARGUMENT; TYPE_PARAMETERS; TYPE_PARAMETER; WILDCARD_TYPE;
TYPE_UPPER_BOUNDS; TYPE_LOWER_BOUNDS;
}
{
/**
* Counts the number of LT seen in the typeArguments production.
* It is used in semantic predicates to ensure we have seen
* enough closing '>' characters; which actually may have been
* either GT, SR or BSR tokens.
*/
private int ltCounter = 0;
}
// Compilation Unit: In Java, this is a single file. This is the start
// rule for this parser
compilationUnit
: // A compilation unit starts with an optional package definition
( (annotations "package")=> packageDefinition
| /* nothing */
)
// Next we have a series of zero or more import statements
( importDefinition )*
// Wrapping things up with any number of class or interface
// definitions
( typeDefinition )*
EOF!
;
// Package statement: optional annotations followed by "package" then the package identifier.
packageDefinition
options {defaultErrorHandler = true;} // let ANTLR handle errors
: annotations p:"package"^ {#p.setType(PACKAGE_DEF);} identifier SEMI!
;
// Import statement: import followed by a package or class name
importDefinition
options {defaultErrorHandler = true;}
{ boolean isStatic = false; }
: i:"import"^ {#i.setType(IMPORT);} ( "static"! {#i.setType(STATIC_IMPORT);} )? identifierStar SEMI!
;
// A type definition is either a class, interface, enum or annotation with possible additional semis.
typeDefinition
options {defaultErrorHandler = true;}
: m:modifiers!
typeDefinitionInternal[#m]
| SEMI!
;
// Protected type definitions production for reuse in other productions
protected typeDefinitionInternal[AST mods]
: classDefinition[#mods] // inner class
| interfaceDefinition[#mods] // inner interface
| enumDefinition[#mods] // inner enum
| annotationDefinition[#mods] // inner annotation
;
// A declaration is the creation of a reference or primitive-type variable
// Create a separate Type/Var tree for each var in the var list.
declaration!
: m:modifiers t:typeSpec[false] v:variableDefinitions[#m,#t]
{#declaration = #v;}
;
// A type specification is a type name with possible brackets afterwards
// (which would make it an array type).
typeSpec[boolean addImagNode]
: classTypeSpec[addImagNode]
| builtInTypeSpec[addImagNode]
;
// A class type specification is a class type with either:
// - possible brackets afterwards
// (which would make it an array type).
// - generic type arguments after
classTypeSpec[boolean addImagNode]
: classOrInterfaceType[false]
(options{greedy=true;}: // match as many as possible
lb:LBRACK^ {#lb.setType(ARRAY_DECLARATOR);} RBRACK!
)*
{
if ( addImagNode ) {
#classTypeSpec = #(#[TYPE,"TYPE"], #classTypeSpec);
}
}
;
// A non-built in type name, with possible type parameters
classOrInterfaceType[boolean addImagNode]
: IDENT (typeArguments)?
(options{greedy=true;}: // match as many as possible
DOT^
IDENT (typeArguments)?
)*
{
if ( addImagNode ) {
#classOrInterfaceType = #(#[TYPE,"TYPE"], #classOrInterfaceType);
}
}
;
// A specialised form of typeSpec where built in types must be arrays
typeArgumentSpec
: classTypeSpec[true]
| builtInTypeArraySpec[true]
;
// A generic type argument is a class type, a possibly bounded wildcard type or a built-in type array
typeArgument
: ( typeArgumentSpec
| wildcardType
)
{#typeArgument = #(#[TYPE_ARGUMENT,"TYPE_ARGUMENT"], #typeArgument);}
;
// Wildcard type indicating all types (with possible constraint)
wildcardType
: q:QUESTION^ {#q.setType(WILDCARD_TYPE);}
(("extends" | "super")=> typeArgumentBounds)?
;
// Type arguments to a class or interface type
typeArguments
{int currentLtLevel = 0;}
:
{currentLtLevel = ltCounter;}
LT! {ltCounter++;}
typeArgument
(options{greedy=true;}: // match as many as possible
{inputState.guessing !=0 || ltCounter == currentLtLevel + 1}?
COMMA! typeArgument
)*
( // turn warning off since Antlr generates the right code,
// plus we have our semantic predicate below
options{generateAmbigWarnings=false;}:
typeArgumentsOrParametersEnd
)?
// make sure we have gobbled up enough '>' characters
// if we are at the "top level" of nested typeArgument productions
{(currentLtLevel != 0) || ltCounter == currentLtLevel}?
{#typeArguments = #(#[TYPE_ARGUMENTS, "TYPE_ARGUMENTS"], #typeArguments);}
;
// this gobbles up *some* amount of '>' characters, and counts how many
// it gobbled.
protected typeArgumentsOrParametersEnd
: GT! {ltCounter-=1;}
| SR! {ltCounter-=2;}
| BSR! {ltCounter-=3;}
;
// Restriction on wildcard types based on super class or derrived class
typeArgumentBounds
{boolean isUpperBounds = false;}
:
( "extends"! {isUpperBounds=true;} | "super"! ) classOrInterfaceType[false]
{
if (isUpperBounds)
{
#typeArgumentBounds = #(#[TYPE_UPPER_BOUNDS,"TYPE_UPPER_BOUNDS"], #typeArgumentBounds);
}
else
{
#typeArgumentBounds = #(#[TYPE_LOWER_BOUNDS,"TYPE_LOWER_BOUNDS"], #typeArgumentBounds);
}
}
;
// A builtin type array specification is a builtin type with brackets afterwards
builtInTypeArraySpec[boolean addImagNode]
: builtInType
(options{greedy=true;}: // match as many as possible
lb:LBRACK^ {#lb.setType(ARRAY_DECLARATOR);} RBRACK!
)+
{
if ( addImagNode ) {
#builtInTypeArraySpec = #(#[TYPE,"TYPE"], #builtInTypeArraySpec);
}
}
;
// A builtin type specification is a builtin type with possible brackets
// afterwards (which would make it an array type).
builtInTypeSpec[boolean addImagNode]
: builtInType
(options{greedy=true;}: // match as many as possible
lb:LBRACK^ {#lb.setType(ARRAY_DECLARATOR);} RBRACK!
)*
{
if ( addImagNode ) {
#builtInTypeSpec = #(#[TYPE,"TYPE"], #builtInTypeSpec);
}
}
;
// A type name. which is either a (possibly qualified and parameterized)
// class name or a primitive (builtin) type
type
: classOrInterfaceType[false]
| builtInType
;
// The primitive types.
builtInType
: "void"
| "boolean"
| "byte"
| "char"
| "short"
| "int"
| "float"
| "long"
| "double"
;
// A (possibly-qualified) java identifier. We start with the first IDENT
// and expand its name by adding dots and following IDENTS
identifier
: IDENT ( DOT^ IDENT )*
;
identifierStar
: IDENT
( DOT^ IDENT )*
( DOT^ STAR )?
;
// A list of zero or more modifiers. We could have used (modifier)* in
// place of a call to modifiers, but I thought it was a good idea to keep
// this rule separate so they can easily be collected in a Vector if
// someone so desires
modifiers
:
(
//hush warnings since the semantic check for "@interface" solves the non-determinism
options{generateAmbigWarnings=false;}:
modifier
|
//Semantic check that we aren't matching @interface as this is not an annotation
//A nicer way to do this would be nice
{LA(1)==AT && !LT(2).getText().equals("interface")}? annotation
)*
{#modifiers = #([MODIFIERS, "MODIFIERS"], #modifiers);}
;
// modifiers for Java classes, interfaces, class/instance vars and methods
modifier
: "private"
| "public"
| "protected"
| "static"
| "transient"
| "final"
| "abstract"
| "native"
| "threadsafe"
| "synchronized"
| "volatile"
| "strictfp"
;
annotation!
: AT! i:identifier ( LPAREN! ( args:annotationArguments )? RPAREN! )?
{#annotation = #(#[ANNOTATION,"ANNOTATION"], i, args);}
;
annotations
: (annotation)*
{#annotations = #([ANNOTATIONS, "ANNOTATIONS"], #annotations);}
;
annotationArguments
: annotationMemberValueInitializer | anntotationMemberValuePairs
;
anntotationMemberValuePairs
: annotationMemberValuePair ( COMMA! annotationMemberValuePair )*
;
annotationMemberValuePair!
: i:IDENT ASSIGN! v:annotationMemberValueInitializer
{#annotationMemberValuePair = #(#[ANNOTATION_MEMBER_VALUE_PAIR,"ANNOTATION_MEMBER_VALUE_PAIR"], i, v);}
;
annotationMemberValueInitializer
:
conditionalExpression | annotation | annotationMemberArrayInitializer
;
// This is an initializer used to set up an annotation member array.
annotationMemberArrayInitializer
: lc:LCURLY^ {#lc.setType(ANNOTATION_ARRAY_INIT);}
( annotationMemberArrayValueInitializer
(
// CONFLICT: does a COMMA after an initializer start a new
// initializer or start the option ',' at end?
// ANTLR generates proper code by matching
// the comma as soon as possible.
options {
warnWhenFollowAmbig = false;
}
:
COMMA! annotationMemberArrayValueInitializer
)*
(COMMA!)?
)?
RCURLY!
;
// The two things that can initialize an annotation array element are a conditional expression
// and an annotation (nested annotation array initialisers are not valid)
annotationMemberArrayValueInitializer
: conditionalExpression
| annotation
;
superClassClause!
: ( "extends" c:classOrInterfaceType[false] )?
{#superClassClause = #(#[EXTENDS_CLAUSE,"EXTENDS_CLAUSE"],c);}
;
// Definition of a Java class
classDefinition![AST modifiers]
: "class" IDENT
// it _might_ have type paramaters
(tp:typeParameters)?
// it _might_ have a superclass...
sc:superClassClause
// it might implement some interfaces...
ic:implementsClause
// now parse the body of the class
cb:classBlock
{#classDefinition = #(#[CLASS_DEF,"CLASS_DEF"],
modifiers,IDENT,tp,sc,ic,cb);}
;
// Definition of a Java Interface
interfaceDefinition![AST modifiers]
: "interface" IDENT
// it _might_ have type paramaters
(tp:typeParameters)?
// it might extend some other interfaces
ie:interfaceExtends
// now parse the body of the interface (looks like a class...)
ib:interfaceBlock
{#interfaceDefinition = #(#[INTERFACE_DEF,"INTERFACE_DEF"],
modifiers,IDENT,tp,ie,ib);}
;
enumDefinition![AST modifiers]
: "enum" IDENT
// it might implement some interfaces...
ic:implementsClause
// now parse the body of the enum
eb:enumBlock
{#enumDefinition = #(#[ENUM_DEF,"ENUM_DEF"],
modifiers,IDENT,ic,eb);}
;
annotationDefinition![AST modifiers]
: AT "interface" IDENT
// now parse the body of the annotation
ab:annotationBlock
{#annotationDefinition = #(#[ANNOTATION_DEF,"ANNOTATION_DEF"],
modifiers,IDENT,ab);}
;
typeParameters
{int currentLtLevel = 0;}
:
{currentLtLevel = ltCounter;}
LT! {ltCounter++;}
typeParameter (COMMA! typeParameter)*
(typeArgumentsOrParametersEnd)?
// make sure we have gobbled up enough '>' characters
// if we are at the "top level" of nested typeArgument productions
{(currentLtLevel != 0) || ltCounter == currentLtLevel}?
{#typeParameters = #(#[TYPE_PARAMETERS, "TYPE_PARAMETERS"], #typeParameters);}
;
typeParameter
:
// I'm pretty sure Antlr generates the right thing here:
(id:IDENT) ( options{generateAmbigWarnings=false;}: typeParameterBounds )?
{#typeParameter = #(#[TYPE_PARAMETER,"TYPE_PARAMETER"], #typeParameter);}
;
typeParameterBounds
:
"extends"! classOrInterfaceType[false]
(BAND! classOrInterfaceType[false])*
{#typeParameterBounds = #(#[TYPE_UPPER_BOUNDS,"TYPE_UPPER_BOUNDS"], #typeParameterBounds);}
;
// This is the body of a class. You can have classFields and extra semicolons.
classBlock
: LCURLY!
( classField | SEMI! )*
RCURLY!
{#classBlock = #([OBJBLOCK, "OBJBLOCK"], #classBlock);}
;
// This is the body of an interface. You can have interfaceField and extra semicolons.
interfaceBlock
: LCURLY!
( interfaceField | SEMI! )*
RCURLY!
{#interfaceBlock = #([OBJBLOCK, "OBJBLOCK"], #interfaceBlock);}
;
// This is the body of an annotation. You can have annotation fields and extra semicolons,
// That's about it (until you see what an annoation field is...)
annotationBlock
: LCURLY!
( annotationField | SEMI! )*
RCURLY!
{#annotationBlock = #([OBJBLOCK, "OBJBLOCK"], #annotationBlock);}
;
// This is the body of an enum. You can have zero or more enum constants
// followed by any number of fields like a regular class
enumBlock
: LCURLY!
( enumConstant ( options{greedy=true;}: COMMA! enumConstant )* ( COMMA! )? )?
( SEMI! ( classField | SEMI! )* )?
RCURLY!
{#enumBlock = #([OBJBLOCK, "OBJBLOCK"], #enumBlock);}
;
// An annotation field
annotationField!
: mods:modifiers
( td:typeDefinitionInternal[#mods]
{#annotationField = #td;}
| t:typeSpec[false] // annotation field
( i:IDENT // the name of the field
LPAREN! RPAREN!
rt:declaratorBrackets[#t]
( "default" amvi:annotationMemberValueInitializer )?
SEMI
{#annotationField =
#(#[ANNOTATION_FIELD_DEF,"ANNOTATION_FIELD_DEF"],
mods,
#(#[TYPE,"TYPE"],rt),
i,amvi
);}
| v:variableDefinitions[#mods,#t] SEMI // variable
{#annotationField = #v;}
)
)
;
//An enum constant may have optional parameters and may have a
//a class body
enumConstant!
: an:annotations
i:IDENT
( LPAREN!
a:argList
RPAREN!
)?
( b:enumConstantBlock )?
{#enumConstant = #([ENUM_CONSTANT_DEF, "ENUM_CONSTANT_DEF"], an, i, a, b);}
;
//The class-like body of an enum constant
enumConstantBlock
: LCURLY!
( enumConstantField | SEMI! )*
RCURLY!
{#enumConstantBlock = #([OBJBLOCK, "OBJBLOCK"], #enumConstantBlock);}
;
//An enum constant field is just like a class field but without
//the posibility of a constructor definition or a static initializer
enumConstantField!
: mods:modifiers
( td:typeDefinitionInternal[#mods]
{#enumConstantField = #td;}
| // A generic method has the typeParameters before the return type.
// This is not allowed for variable definitions, but this production
// allows it, a semantic check could be used if you wanted.
(tp:typeParameters)? t:typeSpec[false] // method or variable declaration(s)
( IDENT // the name of the method
// parse the formal parameter declarations.
LPAREN! param:parameterDeclarationList RPAREN!
rt:declaratorBrackets[#t]
// get the list of exceptions that this method is
// declared to throw
(tc:throwsClause)?
( s2:compoundStatement | SEMI )
{#enumConstantField = #(#[METHOD_DEF,"METHOD_DEF"],
mods,
tp,
#(#[TYPE,"TYPE"],rt),
IDENT,
param,
tc,
s2);}
| v:variableDefinitions[#mods,#t] SEMI
{#enumConstantField = #v;}
)
)
// "{ ... }" instance initializer
| s4:compoundStatement
{#enumConstantField = #(#[INSTANCE_INIT,"INSTANCE_INIT"], s4);}
;
// An interface can extend several other interfaces...
interfaceExtends
: (
e:"extends"!
classOrInterfaceType[false] ( COMMA! classOrInterfaceType[false] )*
)?
{#interfaceExtends = #(#[EXTENDS_CLAUSE,"EXTENDS_CLAUSE"],
#interfaceExtends);}
;
// A class can implement several interfaces...
implementsClause
: (
i:"implements"! classOrInterfaceType[false] ( COMMA! classOrInterfaceType[false] )*
)?
{#implementsClause = #(#[IMPLEMENTS_CLAUSE,"IMPLEMENTS_CLAUSE"],
#implementsClause);}
;
// Now the various things that can be defined inside a class
classField!
: // method, constructor, or variable declaration
mods:modifiers
( td:typeDefinitionInternal[#mods]
{#classField = #td;}
| (tp:typeParameters)?
(
h:ctorHead s:constructorBody // constructor
{#classField = #(#[CTOR_DEF,"CTOR_DEF"], mods, tp, h, s);}
| // A generic method/ctor has the typeParameters before the return type.
// This is not allowed for variable definitions, but this production
// allows it, a semantic check could be used if you wanted.
t:typeSpec[false] // method or variable declaration(s)
( IDENT // the name of the method
// parse the formal parameter declarations.
LPAREN! param:parameterDeclarationList RPAREN!
rt:declaratorBrackets[#t]
// get the list of exceptions that this method is
// declared to throw
(tc:throwsClause)?
( s2:compoundStatement | SEMI )
{#classField = #(#[METHOD_DEF,"METHOD_DEF"],
mods,
tp,
#(#[TYPE,"TYPE"],rt),
IDENT,
param,
tc,
s2);}
| v:variableDefinitions[#mods,#t] SEMI
{#classField = #v;}
)
)
)
// "static { ... }" class initializer
| "static" s3:compoundStatement
{#classField = #(#[STATIC_INIT,"STATIC_INIT"], s3);}
// "{ ... }" instance initializer
| s4:compoundStatement
{#classField = #(#[INSTANCE_INIT,"INSTANCE_INIT"], s4);}
;
// Now the various things that can be defined inside a interface
interfaceField!
: // method, constructor, or variable declaration
mods:modifiers
( td:typeDefinitionInternal[#mods]
{#interfaceField = #td;}
| (tp:typeParameters)?
// A generic method has the typeParameters before the return type.
// This is not allowed for variable definitions, but this production
// allows it, a semantic check could be used if you want a more strict
// grammar.
t:typeSpec[false] // method or variable declaration(s)
( IDENT // the name of the method
// parse the formal parameter declarations.
LPAREN! param:parameterDeclarationList RPAREN!
rt:declaratorBrackets[#t]
// get the list of exceptions that this method is
// declared to throw
(tc:throwsClause)?
SEMI
{#interfaceField = #(#[METHOD_DEF,"METHOD_DEF"],
mods,
tp,
#(#[TYPE,"TYPE"],rt),
IDENT,
param,
tc);}
| v:variableDefinitions[#mods,#t] SEMI
{#interfaceField = #v;}
)
)
;
constructorBody
: lc:LCURLY^ {#lc.setType(SLIST);}
( options { greedy=true; } : explicitConstructorInvocation)?
(statement)*
RCURLY!
;
/** Catch obvious constructor calls, but not the expr.super(...) calls */
explicitConstructorInvocation
: (typeArguments)?
( "this"! lp1:LPAREN^ argList RPAREN! SEMI!
{#lp1.setType(CTOR_CALL);}
| "super"! lp2:LPAREN^ argList RPAREN! SEMI!
{#lp2.setType(SUPER_CTOR_CALL);}
)
;
variableDefinitions[AST mods, AST t]
: variableDeclarator[getASTFactory().dupTree(mods),
getASTFactory().dupList(t)] //dupList as this also copies siblings (like TYPE_ARGUMENTS)
( COMMA!
variableDeclarator[getASTFactory().dupTree(mods),
getASTFactory().dupList(t)] //dupList as this also copies siblings (like TYPE_ARGUMENTS)
)*
;
/** Declaration of a variable. This can be a class/instance variable,
* or a local variable in a method
* It can also include possible initialization.
*/
variableDeclarator![AST mods, AST t]
: id:IDENT d:declaratorBrackets[t] v:varInitializer
{#variableDeclarator = #(#[VARIABLE_DEF,"VARIABLE_DEF"], mods, #(#[TYPE,"TYPE"],d), id, v);}
;
declaratorBrackets[AST typ]
: {#declaratorBrackets=typ;}
(lb:LBRACK^ {#lb.setType(ARRAY_DECLARATOR);} RBRACK!)*
;
varInitializer
: ( ASSIGN^ initializer )?
;
// This is an initializer used to set up an array.
arrayInitializer
: lc:LCURLY^ {#lc.setType(ARRAY_INIT);}
( initializer
(
// CONFLICT: does a COMMA after an initializer start a new
// initializer or start the option ',' at end?
// ANTLR generates proper code by matching
// the comma as soon as possible.
options {
warnWhenFollowAmbig = false;
}
:
COMMA! initializer
)*
(COMMA!)?
)?
RCURLY!
;
// The two "things" that can initialize an array element are an expression
// and another (nested) array initializer.
initializer
: expression
| arrayInitializer
;
// This is the header of a method. It includes the name and parameters
// for the method.
// This also watches for a list of exception classes in a "throws" clause.
ctorHead
: IDENT // the name of the method
// parse the formal parameter declarations.
LPAREN! parameterDeclarationList RPAREN!
// get the list of exceptions that this method is declared to throw
(throwsClause)?
;
// This is a list of exception classes that the method is declared to throw
throwsClause
: "throws"^ identifier ( COMMA! identifier )*
;
// A list of formal parameters
// Zero or more parameters
// If a parameter is variable length (e.g. String... myArg) it is the right-most parameter
parameterDeclarationList
// The semantic check in ( .... )* block is flagged as superfluous, and seems superfluous but
// is the only way I could make this work. If my understanding is correct this is a known bug
: ( ( parameterDeclaration )=> parameterDeclaration
( options {warnWhenFollowAmbig=false;} : ( COMMA! parameterDeclaration ) => COMMA! parameterDeclaration )*
( COMMA! variableLengthParameterDeclaration )?
|
variableLengthParameterDeclaration
)?
{#parameterDeclarationList = #(#[PARAMETERS,"PARAMETERS"],
#parameterDeclarationList);}
;
// A formal parameter.
parameterDeclaration!
: pm:parameterModifier t:typeSpec[false] id:IDENT
pd:declaratorBrackets[#t]
{#parameterDeclaration = #(#[PARAMETER_DEF,"PARAMETER_DEF"],
pm, #([TYPE,"TYPE"],pd), id);}
;
variableLengthParameterDeclaration!
: pm:parameterModifier t:typeSpec[false] TRIPLE_DOT! id:IDENT
pd:declaratorBrackets[#t]
{#variableLengthParameterDeclaration = #(#[VARIABLE_PARAMETER_DEF,"VARIABLE_PARAMETER_DEF"],
pm, #([TYPE,"TYPE"],pd), id);}
;
parameterModifier
//final can appear amongst annotations in any order - greedily consume any preceding
//annotations to shut nond-eterminism warnings off
: (options{greedy=true;} : annotation)* (f:"final")? (annotation)*
{#parameterModifier = #(#[MODIFIERS,"MODIFIERS"], #parameterModifier);}
;
// Compound statement. This is used in many contexts:
// Inside a class definition prefixed with "static":
// it is a class initializer
// Inside a class definition without "static":
// it is an instance initializer
// As the body of a method
// As a completely indepdent braced block of code inside a method
// it starts a new scope for variable definitions
compoundStatement
: lc:LCURLY^ {#lc.setType(SLIST);}
// include the (possibly-empty) list of statements
(statement)*
RCURLY!
;
statement
// A list of statements in curly braces -- start a new scope!
: compoundStatement
// declarations are ambiguous with "ID DOT" relative to expression
// statements. Must backtrack to be sure. Could use a semantic