forked from checkstyle/checkstyle
/
java.g
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/
java.g
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////////////////////////////////////////////////////////////////////////////////
// checkstyle: Checks Java source code for adherence to a set of rules.
// Copyright (C) 2001-2014 Oliver Burn
//
// This library is free software; you can redistribute it and/or
// modify it under the terms of the GNU Lesser General Public
// License as published by the Free Software Foundation; either
// version 2.1 of the License, or (at your option) any later version.
//
// This library is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
// Lesser General Public License for more details.
//
// You should have received a copy of the GNU Lesser General Public
// License along with this library; if not, write to the Free Software
// Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
////////////////////////////////////////////////////////////////////////////////
header {
package com.puppycrawl.tools.checkstyle.grammar;
import com.puppycrawl.tools.checkstyle.DetailAstImpl;
import java.text.MessageFormat;
import antlr.CommonHiddenStreamToken;
}
/** Java 1.5 Recognizer
*
* This grammar is in the PUBLIC DOMAIN
*/
class GeneratedJavaRecognizer extends Parser;
options {
k = 2; // two token lookahead
exportVocab=GeneratedJava; // Call its vocabulary "GeneratedJava"
codeGenMakeSwitchThreshold = 2; // Some optimizations
codeGenBitsetTestThreshold = 3;
defaultErrorHandler = false; // Don't generate parser error handlers
buildAST = true;
}
//Please add new tokens only in the end of list! Otherwise you break compatibility!
tokens {
//Pre-1.4 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;
//ANTLR-generated pre-1.4 tokens now listed here to preserve their numerical
//order so as to make all future version of this grammar backwardly compatible
LITERAL_package="package";SEMI;LITERAL_import="import";LBRACK;RBRACK;
LITERAL_void="void";LITERAL_boolean="boolean";LITERAL_byte="byte";
LITERAL_char="char";LITERAL_short="short";LITERAL_int="int";
LITERAL_float="float";LITERAL_long="long";LITERAL_double="double";
IDENT;DOT;STAR;LITERAL_private="private";LITERAL_public="public";
LITERAL_protected="protected";LITERAL_static="static";
LITERAL_transient="transient";LITERAL_native="native";
LITERAL_synchronized="synchronized";LITERAL_volatile="volatile";
//Please add new tokens only in the end of list! Otherwise you break compatibility!
LITERAL_class="class";LITERAL_extends="extends";
LITERAL_interface="interface";LCURLY;RCURLY;COMMA;
LITERAL_implements="implements";LPAREN;RPAREN;LITERAL_this="this";
LITERAL_super="super";ASSIGN;LITERAL_throws="throws";COLON;
LITERAL_if="if";LITERAL_while="while";LITERAL_do="do";
LITERAL_break="break";LITERAL_continue="continue";LITERAL_return="return";
LITERAL_switch="switch";LITERAL_throw="throw";LITERAL_for="for";
LITERAL_else="else";LITERAL_case="case";LITERAL_default="default";
//Please add new tokens only in the end of list! Otherwise you break compatibility!
LITERAL_try="try";LITERAL_catch="catch";LITERAL_finally="finally";
PLUS_ASSIGN;MINUS_ASSIGN;STAR_ASSIGN;DIV_ASSIGN;MOD_ASSIGN;SR_ASSIGN;
BSR_ASSIGN;SL_ASSIGN;BAND_ASSIGN;BXOR_ASSIGN;BOR_ASSIGN;QUESTION;
LOR;LAND;BOR;BXOR;BAND;NOT_EQUAL;EQUAL;LT;GT;LE;GE;
LITERAL_instanceof="instanceof";SL;SR;BSR;PLUS;MINUS;DIV;MOD;
INC;DEC;BNOT;LNOT;LITERAL_true="true";LITERAL_false="false";
LITERAL_null="null";LITERAL_new="new";NUM_INT;CHAR_LITERAL;
STRING_LITERAL;NUM_FLOAT;NUM_LONG;NUM_DOUBLE;WS;SINGLE_LINE_COMMENT;
BLOCK_COMMENT_BEGIN;ESC;HEX_DIGIT;VOCAB;EXPONENT;FLOAT_SUFFIX;
//Please add new tokens only in the end of list! Otherwise you break compatibility!
//Token for Java 1.4 language enhancements
ASSERT;
//Tokens for Java 1.5 language enhancements
STATIC_IMPORT; ENUM; 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; AT; ELLIPSIS;
GENERIC_START; GENERIC_END; TYPE_EXTENSION_AND;
//Please add new tokens only in the end of list! Otherwise you break compatibility!
// token which was not included to grammar initially
// we need to put it to the end to maintain binary compatibility
// with previous versions
DO_WHILE;
//Tokens for Java 1.7 language enhancements
RESOURCE_SPECIFICATION; RESOURCES; RESOURCE;
//Tokens for Java 1.8
DOUBLE_COLON; METHOD_REF; LAMBDA;
//Support of java comments has been extended
BLOCK_COMMENT_END;COMMENT_CONTENT;
}
{
/**
* 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;
/**
* Counts the number of '>' characters that have been seen but
* have not yet been associated with the end of a typeParameters or
* typeArguments production. This is necessary because SR and BSR
* tokens have significance (the extra '>' characters) not only for the production
* that sees them but also productions higher in the stack (possibly right up to an outer-most
* typeParameters production). As the stack of the typeArguments/typeParameters productions
* unwind, any '>' characters seen prematurely through SRs or BSRs are reconciled.
*/
private int gtToReconcile = 0;
/**
* The most recently seen gt sequence (GT, SR or BSR)
* encountered in any type argument or type parameter production.
* We retain this so we can keep manage the synthetic GT tokens/
* AST nodes we emit to have '<' & '>' balanced trees when encountering
* SR and BSR tokens.
*/
private DetailAstImpl currentGtSequence = null;
/**
* Consume a sequence of '>' characters (GT, SR or BSR)
* and match these against the '<' characters seen.
*/
private void consumeCurrentGtSequence(DetailAstImpl gtSequence)
{
currentGtSequence = gtSequence;
gtToReconcile += currentGtSequence.getText().length();
ltCounter -= currentGtSequence.getText().length();
}
/**
* Emits a single GT AST node with the line and column correctly
* set to its position in the source file. This must only
* ever be called when a typeParameters or typeArguments production
* is ending and there is at least one GT character to be emitted.
*
* @see #areThereGtsToEmit
*/
private DetailAstImpl emitSingleGt()
{
gtToReconcile -= 1;
CommonHiddenStreamToken gtToken = new CommonHiddenStreamToken(GENERIC_END, ">");
gtToken.setLine(currentGtSequence.getLineNo());
gtToken.setColumn(currentGtSequence.getColumnNo()
+ (currentGtSequence.getText().length() - gtToReconcile));
return (DetailAstImpl)astFactory.create(gtToken);
}
/**
* @return true if there is at least one '>' seen but
* not reconciled with the end of a typeParameters or
* typeArguments production; returns false otherwise
*/
private boolean areThereGtsToEmit()
{
return (gtToReconcile > 0);
}
/**
* @return true if there is exactly one '>' seen but
* not reconciled with the end of a typeParameters
* production; returns false otherwise
*/
private boolean isThereASingleGtToEmit()
{
return (gtToReconcile == 1);
}
/**
* @return true if the '<' and '>' are evenly matched
* at the current typeParameters/typeArguments nested depth
*/
private boolean areLtsAndGtsBalanced(int currentLtLevel)
{
return ((currentLtLevel != 0) || ltCounter == currentLtLevel);
}
}
// 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
// semantic check because package definitions can be annotated
// which causes possible non-determinism in Antrl
( (annotations "package")=> packageDefinition
| /* nothing */
)
// Next we have a series of zero or more import statements
( options{generateAmbigWarnings=false;}:importDefinition )*
// Wrapping things up with any number of class or interface
// definitions
( typeDefinition )*
EOF!
;
// Package statement: "package" followed by an 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;}
: i:"import"^ {#i.setType(IMPORT);}
( "static" {#i.setType(STATIC_IMPORT);} )? identifierStar SEMI
| SEMI
;
// A type definition in a file is either a class, interface, enum of annotation definition
typeDefinition
options {defaultErrorHandler = true;}
: m:modifiers! typeDefinitionInternal[#m]
| SEMI
;
// Internal type definition for production reuse
protected
typeDefinitionInternal[AST modifiers]
: classDefinition[#modifiers]
| interfaceDefinition[#modifiers]
| enumDefinition[#modifiers]
| annotationDefinition[#modifiers]
;
// 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 type specification for a variable length parameter is a type name with
// possible brackets afterwards that can end with annotations.
variableLengthParameterTypeSpec
: (classOrInterfaceType[false] | builtInType)
({LA(1) == AT}? annotations | )
(lb:LBRACK^ {#lb.setType(ARRAY_DECLARATOR);} RBRACK ({LA(1) == AT}? annotations | ))*
;
// 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[addImagNode]
(options{greedy=true; }:
({LA(1) == AT}? annotations
| )
lb:LBRACK^ {#lb.setType(ARRAY_DECLARATOR);} RBRACK)*
{
if ( addImagNode ) {
#classTypeSpec = #(#[TYPE,"TYPE"], #classTypeSpec);
}
}
;
classOrInterfaceType[boolean addImagNode]
: ({LA(1) == AT}? annotations
| )
IDENT
(options{warnWhenFollowAmbig=false;}: typeArguments[addImagNode])?
(options{greedy=true; }: // match as many as possible
DOT^
({LA(1) == AT}? annotations
| )
IDENT
(options{warnWhenFollowAmbig=false;}: typeArguments[addImagNode])?
)*
;
// A generic type argument is a class type, a possibly bounded wildcard type or built-in type array
typeArgument[boolean addImagNode]
: ( ({LA(1) == AT}? annotations
| ) (
classTypeSpec[addImagNode]
| builtInTypeSpec[addImagNode]
| wildcardType[addImagNode])
)
{#typeArgument = #(#[TYPE_ARGUMENT,"TYPE_ARGUMENT"], #typeArgument);}
;
wildcardType[boolean addImagNode]
: q:QUESTION {#q.setType(WILDCARD_TYPE);}
(("extends" | "super")=> typeArgumentBounds[addImagNode])?
;
typeArguments[boolean addImagNode]
{int currentLtLevel = 0;}
:
{currentLtLevel = ltCounter;}
lt:LT {#lt.setType(GENERIC_START); ;ltCounter++;}
// (Dinesh Bolkensteyn) Added support for Java 7 diamond notation
// (disabled ambiguous warnings since generated code seems to work)
(options{generateAmbigWarnings=false;}:typeArgument[addImagNode]
(options{greedy=true;}: // match as many as possible
// If there are any '>' to reconcile
// (i.e. we've recently encountered a DT, SR or BSR
// - the end of one or more type arguments and
// possibly an enclosing type parameter)
// then further type arguments are not possible
{gtToReconcile == 0}? COMMA typeArgument[addImagNode]
)*)?
( // turn warning off since Antlr generates the right code,
// plus we have our semantic predicate below
options{generateAmbigWarnings=false;}:
typeArgumentsOrParametersEnd
)?
// As we are leaving a typeArguments production, the enclosing '>'
// we've just read (and we've possibly seen more than one in the
// case of SRs and BSRs) can now be marked as reconciled with a '<'
// but we still leave unreconciled the count for any excess '>'
// for other typeArguments or typeParameters productions higher in
// the stack
{
if (areThereGtsToEmit())
{
astFactory.addASTChild(currentAST, emitSingleGt());
}
}
// make sure we have gobbled up enough '>' characters
// if we are at the "top level" of nested typeArgument productions
{areLtsAndGtsBalanced(currentLtLevel)}?
{#typeArguments = #(#[TYPE_ARGUMENTS, "TYPE_ARGUMENTS"], #typeArguments);}
;
// this gobbles up *some* amount of '>' characters, and counts how many
// it gobbled.
protected typeArgumentsOrParametersEnd!
: g:GT {consumeCurrentGtSequence((DetailAstImpl)#g);}
| sr:SR {consumeCurrentGtSequence((DetailAstImpl)#sr);}
| bsr:BSR {consumeCurrentGtSequence((DetailAstImpl)#bsr);}
;
typeArgumentBounds[boolean addImagNode]
:
(
e:"extends"^ {#e.setType(TYPE_UPPER_BOUNDS); }
| s:"super"^ { #s.setType(TYPE_LOWER_BOUNDS); }
)
(
classOrInterfaceType[addImagNode]
| builtInType
)
(options{greedy=true;}: lb:LBRACK^ {#lb.setType(ARRAY_DECLARATOR);} RBRACK)*
;
// 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; }:
({LA(1) == AT}? annotations
| )
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
: ({LA(1) == AT}? annotations | )
(classOrInterfaceType[false] | builtInType)
;
/** 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.
@throws RecognitionException if recognition problem occurs.
@throws TokenStreamException if problem occurs while generating a stream of tokens.
*/
declaration!
: m:modifiers t:typeSpec[false] v:variableDefinitions[#m,#t]
{#declaration = #v;}
;
// 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 (options{warnWhenFollowAmbig=false;}: 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, um, 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"
| "synchronized"
// | "const" // reserved word, but not valid
| "volatile"
| "strictfp"
| "default"
;
annotation!
: AT i:identifier
(options {generateAmbigWarnings=false;}:
l:LPAREN ( args:annotationArguments )?
r:RPAREN
)?
{#annotation = #(#[ANNOTATION,"ANNOTATION"], AT, i, l, args, r);}
;
annotations
: (options{generateAmbigWarnings=false;}:annotation)*
{#annotations = #(#[ANNOTATIONS,"ANNOTATIONS"], #annotations);}
;
annotationArguments
: annotationMemberValueInitializer | annotationMemberValuePairs
;
annotationMemberValuePairs
: annotationMemberValuePair ( COMMA annotationMemberValuePair )*
;
annotationMemberValuePair!
: i:IDENT a:ASSIGN v:annotationMemberValueInitializer
{#annotationMemberValuePair =
#(#[ANNOTATION_MEMBER_VALUE_PAIR,"ANNOTATION_MEMBER_VALUE_PAIR"], i, a, v);}
;
annotationMemberValueInitializer
:
(annotationExpression)=>annotationExpression | 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
: (annotationExpression)=>annotationExpression
| annotation
;
annotationExpression
: conditionalExpression
{#annotationExpression = #(#[EXPR,"EXPR"],#annotationExpression);}
;
// Definition of a Java class
classDefinition![AST modifiers]
: c:"class" IDENT
// it _might_ have type parameters
(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, c, IDENT, tp, sc, ic, cb);}
;
superClassClause
: ( e:"extends"^ {#e.setType(EXTENDS_CLAUSE);}
c:classOrInterfaceType[false] )?
;
// Definition of a Java Interface
interfaceDefinition![AST modifiers]
: i:"interface" IDENT
// it _might_ have type parameters
(tp:typeParameters)?
// it might extend some other interfaces
ie:interfaceExtends
// now parse the body of the interface (looks like a class...)
cb:classBlock
{#interfaceDefinition = #(#[INTERFACE_DEF,"INTERFACE_DEF"],
modifiers, i, IDENT,tp,ie,cb);}
;
enumDefinition![AST modifiers]
: e:ENUM IDENT
// it might implement some interfaces...
ic:implementsClause
// now parse the body of the enum
eb:enumBlock
{#enumDefinition = #(#[ENUM_DEF,"ENUM_DEF"],
modifiers, e, IDENT, ic, eb);}
;
annotationDefinition![AST modifiers]
: a:AT i:"interface" IDENT
// now parse the body of the annotation
ab:annotationBlock
{#annotationDefinition = #(#[ANNOTATION_DEF,"ANNOTATION_DEF"],
modifiers, a, i, IDENT, ab);}
;
typeParameters
{int currentLtLevel = 0;}
:
{currentLtLevel = ltCounter;}
lt:LT {#lt.setType(GENERIC_START); ltCounter++;}
typeParameter (COMMA typeParameter)*
(typeArgumentsOrParametersEnd)?
// There should be only one '>' to reconcile - the enclosing
// '>' for the type parameter. Any other adjacent '>' seen should
// have been reconciled with type arguments for the last type parameter
// hence we can assert here that there is but one unaccounted '>'.
{
if (isThereASingleGtToEmit()) {
astFactory.addASTChild(currentAST, emitSingleGt());
}
}
// make sure we have gobbled up enough '>' characters
// if we are at the "top level" of nested typeArgument productions
{areLtsAndGtsBalanced(currentLtLevel)}?
{#typeParameters = #(#[TYPE_PARAMETERS, "TYPE_PARAMETERS"], #typeParameters);}
;
typeParameter
:
// I'm pretty sure Antlr generates the right thing here:
({LA(1) == AT}? annotations | )
(id:IDENT) ( options{generateAmbigWarnings=false;}: typeParameterBounds )?
{#typeParameter = #(#[TYPE_PARAMETER,"TYPE_PARAMETER"], #typeParameter);}
;
typeParameterBounds
:
e:"extends"^ classOrInterfaceType[true]
(b:BAND {#b.setType(TYPE_EXTENSION_AND);} classOrInterfaceType[true])*
{#e.setType(TYPE_UPPER_BOUNDS);}
;
// This is the body of an annotation. You can have annotation fields and extra semicolons,
// That's about it (until you see what an annotation field is...)
annotationBlock
: LCURLY
( annotationField | SEMI )*
RCURLY
{#annotationBlock = #([OBJBLOCK, "OBJBLOCK"], #annotationBlock);}
;
// 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]
( d:annotationDefault )?
s:SEMI
{#annotationField =
#(#[ANNOTATION_FIELD_DEF,"ANNOTATION_FIELD_DEF"],
mods,
#(#[TYPE,"TYPE"],rt),
i,
LPAREN,
RPAREN,
d,
s
);}
| v:variableDefinitions[#mods,#t] s6:SEMI
{
#annotationField = #v;
#v.addChild(#s6);
}
)
)
;
annotationDefault
: "default"^ annotationMemberValueInitializer
;
// 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 ( field | SEMI )* )?
RCURLY
{#enumBlock = #([OBJBLOCK, "OBJBLOCK"], #enumBlock);}
;
//An enum constant may have optional parameters and may have a
//a body
enumConstant!
: an:annotations
i:IDENT
( l:LPAREN
args:argList
r:RPAREN
)?
( b:enumConstantBlock )?
{#enumConstant = #([ENUM_CONSTANT_DEF, "ENUM_CONSTANT_DEF"], an, i, l, args, r, 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 possibility 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 | s3:SEMI )
{#enumConstantField = #(#[METHOD_DEF,"METHOD_DEF"],
mods,
tp,
#(#[TYPE,"TYPE"],rt),
IDENT,
LPAREN,
param,
RPAREN,
tc,
s2,
s3);}
| v:variableDefinitions[#mods,#t] s6:SEMI
{
#enumConstantField = #v;
#v.addChild(#s6);
}
)
)
// "{ ... }" instance initializer
| s4:compoundStatement
{#enumConstantField = #(#[INSTANCE_INIT,"INSTANCE_INIT"], s4);}
;
// This is the body of a class. You can have fields and extra semicolons,
// That's about it (until you see what a field is...)
classBlock
: LCURLY
( field | SEMI )*
RCURLY
{#classBlock = #([OBJBLOCK, "OBJBLOCK"], #classBlock);}
;
// An interface can extend several other interfaces...
interfaceExtends
: (
e:"extends"^ {#e.setType(EXTENDS_CLAUSE);}
classOrInterfaceType[false] ( COMMA classOrInterfaceType[false] )*
)?
;
// A class can implement several interfaces...
implementsClause
: (
i:"implements"^ {#i.setType(IMPLEMENTS_CLAUSE);}
classOrInterfaceType[false] ( COMMA classOrInterfaceType[false] )*
)?
;
// Now the various things that can be defined inside a class or interface...
// Note that not all of these are really valid in an interface (constructors,
// for example), and if this grammar were used for a compiler there would
// need to be some semantic checks to make sure we're doing the right thing...
field!
: // method, constructor, or variable declaration
mods:modifiers
(td:typeDefinitionInternal[#mods]
{#field = #td;}
// 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.
| (tp:typeParameters)?
(
h:ctorHead s:constructorBody // constructor
{#field = #(#[CTOR_DEF,"CTOR_DEF"], mods, tp, h, s);}
|
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 | s5:SEMI )
{#field = #(#[METHOD_DEF,"METHOD_DEF"],
mods,
tp,
#(#[TYPE,"TYPE"],rt),
IDENT,
LPAREN,
param,
RPAREN,
tc,
s2,
s5);}
| v:variableDefinitions[#mods,#t] (s6:SEMI)?
{
#field = #v;
#v.addChild(#s6);
}
)
)
)
// "static { ... }" class initializer
| si:"static" s3:compoundStatement
{#si.setType(STATIC_INIT);
#si.setText("STATIC_INIT");
#field = #(#si, s3);}
// "{ ... }" instance initializer
| s4:compoundStatement
{#field = #(#[INSTANCE_INIT,"INSTANCE_INIT"], s4);}
;
constructorBody
: lc:LCURLY^ {#lc.setType(SLIST);}
// Predicate might be slow but only checked once per constructor def
// not for general methods.
( (explicitConstructorInvocation) => explicitConstructorInvocation
|
)
(statement)*
RCURLY
;
explicitConstructorInvocation
: ( options {
// this/super can begin a primaryExpression too; with finite
// lookahead ANTLR will think the 3rd alternative conflicts
// with 1, 2. I am shutting off warning since ANTLR resolves
// the nondeterminism by correctly matching alts 1 or 2 when
// it sees this( or super(
generateAmbigWarnings=false;
}
:
(typeArguments[false])?
( t:"this"^ LPAREN argList RPAREN SEMI
{#t.setType(CTOR_CALL);}
| s:"super"^ LPAREN argList RPAREN SEMI
{#s.setType(SUPER_CTOR_CALL);}
)
| // (new Outer()).super() (create enclosing instance)
primaryExpression DOT (typeArguments[false])? s1:"super"^ LPAREN argList RPAREN SEMI
{#s1.setType(SUPER_CTOR_CALL);}
)
;
variableDefinitions[AST mods, AST t]
: variableDeclarator[(AST) getASTFactory().dupTree(mods),
//dupList as this also copies siblings (like TYPE_ARGUMENTS)
(AST) getASTFactory().dupList(t)]
( COMMA
variableDeclarator[(AST) getASTFactory().dupTree(mods),
//dupList as this also copies siblings (like TYPE_ARGUMENTS)
(AST) getASTFactory().dupList(t)]
)*
;
/** Declaration of a variable. This can be a class/instance variable,
* or a local variable in a method.
@param mods declaration mods.
@param t variable declaration type.
@throws RecognitionException if recognition problem occurs.
@throws TokenStreamException if problem occurs while generating a stream of tokens.
* 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]
: ({LA(1) == AT}? an:annotations | ) lb:LBRACK {#lb.setType(ARRAY_DECLARATOR);} rb:RBRACK
db:declaratorBrackets[#(lb, typ, an, rb)]
{#declaratorBrackets = #db;}
| {#declaratorBrackets = typ;}
;
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"^ ({LA(1) == AT}? annotations
| ) identifier ( COMMA ({LA(1) == AT}? annotations | ) 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 in Antlr
: ( ( parameterDeclaration )=> parameterDeclaration
( options {warnWhenFollowAmbig=false;} :
( COMMA parameterDeclaration ) => COMMA parameterDeclaration )*
( COMMA variableLengthParameterDeclaration )?
|
variableLengthParameterDeclaration
)?
{#parameterDeclarationList = #(#[PARAMETERS,"PARAMETERS"],
#parameterDeclarationList);}
;
variableLengthParameterDeclaration!
: pm:parameterModifier t:variableLengthParameterTypeSpec td:ELLIPSIS IDENT
pd:declaratorBrackets[#t]
{#variableLengthParameterDeclaration = #(#[PARAMETER_DEF,"PARAMETER_DEF"],
pm, #([TYPE,"TYPE"],pd), td, IDENT);}
;
parameterModifier
//final can appear amongst annotations in any order - greedily consume any preceding
//annotations to shut non-determinism warnings off
: (options{greedy=true;} : annotation)* (f:"final")?
(options {warnWhenFollowAmbig=false;}: annotation)*
{#parameterModifier = #(#[MODIFIERS,"MODIFIERS"], #parameterModifier);}
;
// A formal parameter.
parameterDeclaration!
: pm:parameterModifier (t:typeSpec[false])?
id:parameterIdent pd:declaratorBrackets[#t]
{#parameterDeclaration = #(#[PARAMETER_DEF,"PARAMETER_DEF"],
pm, #([TYPE,"TYPE"],pd), id);}