ANTLR grammar for smalltalk chunks

gistfile1.st

program returns [Program n]
	:	(chunk)* EOF	
	;	

chunk returns [Chunk n]
	:	sequence EOF
	|	sequence '!'
	|	'!' sequence '!'
	|	messagePattern sequence '! !'	
	;	

messagePattern returns [MessagePattern n]
	:	NAME
	|	KEYWORD NAME	
	;