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Use semantic lookahead for the module productions

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The new keyword are only "restricted keywords" and can still be used
as identifiers.
This commit is contained in:
Andreas Dangel
2017-09-22 23:43:43 +02:00
parent 07eede38db
commit f30eb4b5ff
1 changed files with 30 additions and 11 deletions
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41
pmd-java/etc/grammar/Java.jjt
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@ -379,6 +379,14 @@ public class JavaParser {
return res;
}
/**
* Semantic lookahead to check if the next identifier is a
* specific restricted keyword.
*/
private boolean isKeyword(String keyword) {
return getToken(1).kind == IDENTIFIER && getToken(1).image.equals(keyword);
}
public Map<Integer, String> getSuppressMap() {
return token_source.getSuppressMap();
}
@ -497,7 +505,17 @@ TOKEN :
| < VOLATILE: "volatile" >
| < WHILE: "while" >
| < STRICTFP: "strictfp" >
| < OPEN: "open" >
}
/* Restricted Keywords */
// Note: These are commented out, since these keywords
// can still be used as identifiers.
// see isKeyword() semantic lookup
/*
TOKEN :
{
< OPEN: "open" >
| < MODULE: "module" >
| < REQUIRES: "requires" >
| < TRANSITIVE: "transitive" >
@ -508,6 +526,7 @@ TOKEN :
| < PROVIDES: "provides" >
| < WITH: "with" >
}
*/
/* LITERALS */
@ -1311,7 +1330,7 @@ ASTCompilationUnit CompilationUnit() :
[ LOOKAHEAD( ( Annotation() )* "package" ) PackageDeclaration() ( EmptyStatement() )* ]
( ImportDeclaration() ( EmptyStatement() )* )*
( LOOKAHEAD(2) TypeDeclaration() ( EmptyStatement() )* )*
[ ModuleDeclaration() ( EmptyStatement() )* ]
[ LOOKAHEAD({isKeyword("open") || isKeyword("module") || getToken(1).kind == AT}) ModuleDeclaration() ( EmptyStatement() )* ]
( < "\u001a" > )?
( < "~[]" > )?
<EOF>
@ -1378,7 +1397,7 @@ void TypeDeclaration():
(
ClassOrInterfaceDeclaration(modifiers)
|
EnumDeclaration(modifiers)
LOOKAHEAD({isKeyword("enum")}) EnumDeclaration(modifiers)
|
AnnotationTypeDeclaration(modifiers)
)
@ -1486,7 +1505,7 @@ void ClassOrInterfaceBodyDeclaration():
{ LOOKAHEAD(["static"] "{" ) Initializer()
| modifiers = Modifiers()
( LOOKAHEAD(3) ClassOrInterfaceDeclaration(modifiers)
| LOOKAHEAD(3) EnumDeclaration(modifiers)
| LOOKAHEAD({isKeyword("enum")}) EnumDeclaration(modifiers)
| LOOKAHEAD( [ TypeParameters() ] <IDENTIFIER> "(" ) ConstructorDeclaration(modifiers)
| LOOKAHEAD( Type() <IDENTIFIER> ( "[" "]" )* ( "," | "=" | ";" ) ) FieldDeclaration(modifiers)
| LOOKAHEAD(2) MethodDeclaration(modifiers)
@ -2405,7 +2424,7 @@ void ModuleDeclaration():
checkForBadModuleUsage();
}
{
( Annotation() )* ["open" {jjtThis.setOpen(true);}] "module"
( Annotation() )* [LOOKAHEAD({isKeyword("open")}) <IDENTIFIER> {jjtThis.setOpen(true);}] LOOKAHEAD({isKeyword("module")}) <IDENTIFIER>
t=<IDENTIFIER> { s.append(t.image); }
( "." t=<IDENTIFIER> { s.append('.').append(t.image); } )* { jjtThis.setImage(s.toString()); }
"{" (ModuleDirective())* "}"
@ -2414,14 +2433,14 @@ void ModuleDeclaration():
void ModuleDirective():
{}
{
( "requires" { jjtThis.setType(ASTModuleDirective.DirectiveType.REQUIRES); }
("transitive" { jjtThis.setRequiresModifier(ASTModuleDirective.RequiresModifier.TRANSITIVE); } |
( LOOKAHEAD({isKeyword("requires")}) <IDENTIFIER> { jjtThis.setType(ASTModuleDirective.DirectiveType.REQUIRES); }
(LOOKAHEAD({isKeyword("transitive")}) <IDENTIFIER> { jjtThis.setRequiresModifier(ASTModuleDirective.RequiresModifier.TRANSITIVE); } |
"static" { jjtThis.setRequiresModifier(ASTModuleDirective.RequiresModifier.STATIC); } )?
ModuleName() ";" )
| ( "exports" { jjtThis.setType(ASTModuleDirective.DirectiveType.EXPORTS); } Name() [ "to" ModuleName() ("," ModuleName())*] ";" )
| ( "opens" { jjtThis.setType(ASTModuleDirective.DirectiveType.OPENS); } Name() [ "to" ModuleName() ("," ModuleName())*] ";" )
| ( "uses" { jjtThis.setType(ASTModuleDirective.DirectiveType.USES); } Name() ";" )
| ( "provides" { jjtThis.setType(ASTModuleDirective.DirectiveType.PROVIDES); } Name() "with" Name() ("," Name() )* ";" )
| ( LOOKAHEAD({isKeyword("exports")}) <IDENTIFIER> { jjtThis.setType(ASTModuleDirective.DirectiveType.EXPORTS); } Name() [ LOOKAHEAD({isKeyword("to")}) <IDENTIFIER> ModuleName() ("," ModuleName())*] ";" )
| ( LOOKAHEAD({isKeyword("opens")}) <IDENTIFIER> { jjtThis.setType(ASTModuleDirective.DirectiveType.OPENS); } Name() [ LOOKAHEAD({isKeyword("to")}) <IDENTIFIER> ModuleName() ("," ModuleName())*] ";" )
| ( LOOKAHEAD({isKeyword("uses")}) <IDENTIFIER> { jjtThis.setType(ASTModuleDirective.DirectiveType.USES); } Name() ";" )
| ( LOOKAHEAD({isKeyword("provides")}) <IDENTIFIER> { jjtThis.setType(ASTModuleDirective.DirectiveType.PROVIDES); } Name() LOOKAHEAD({isKeyword("with")}) <IDENTIFIER> Name() ("," Name() )* ";" )
}
// Similar to Name()