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header
{
package processing.mode.java.preproc;
}
/**
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
*
*
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.
*
* 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
// predicate to test symbol table to see what the type was coming
// up, but that
'
s pretty hard without a symbol table ;)
| (declaration)
=>
declaration SEMI!
//
An expression statement. This could be a method call,
//
assignment statement,
or
any other expression evaluated
for
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