[antlr-interest] OutOfMemoryException when parsing incorrect input

[Rob Harrop]

I have written a simple (I think!) grammar to parse some of the  
headers in an OSGi bundle manifest. I have included the cut down  
version here:

=================================
grammar OsgiPackageHeader;

header 	:	pkg_decl (',' pkg_decl)*
	;
	
pkg_decl
	: packageNames  (';' parameter) *
	;

packageNames
	: packageName (';' packageName)*
	;
		
parameter
	:	directive | attribute
	;
	
directive
	:	IDENTIFIER ':=' argument
	;

attribute
	:	IDENTIFIER '=' argument
	;

argument
	: 	IDENTIFIER | QUOTED_STRING
	;
	
packageName
	: IDENTIFIER {this.packageNames.add($IDENTIFIER.text);}
	;

QUOTED_STRING
	:  '"' (~('\\' | '"' | '\r' | '\n') | '\\' ('\\' | '"')) * '"'
	{setText(getText().substring(1, getText().length()-1));}
	;
	
IDENTIFIER
	: IDENTIFIER_PART ('.' IDENTIFIER_PART) *
	;

fragment
IDENTIFIER_PART
	: (ALPHA | DIGIT | '_' | '$' | '-') *
	;

fragment	
DIGIT	:	'0'..'9'
	;

fragment	
ALPHA	:	'a'..'z' | 'A'..'Z'
	;

WS	:	' '+ {skip();}
	;
=====================

Attempting to invoke header() with incorrect input like "**" results  
in an OutOfMemoryException. What am I doing wrong?
	
Regards,

Rob

Rob Harrop
SpringSource

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