Cucumber ANTLR grammar

gistfile1.txt

grammar Gherkin;

//options {
//    language=Ruby;
//}

feature	:	NEWLINE* comment? NEWLINE* SPACE* tags? NEWLINE* SPACE* feature_keyword SPACE* line_to_eol NEWLINE+ (feature_elements .)* feature_elements ;

fragment
feature_elements 
	:	(scenario_outline | scenario)* ;

scenario 
	:	comment? tags? scenario_keyword SPACE* line_to_eol NEWLINE+ steps ;
	
scenario_outline 
	:	comment? tags? scenario_outline_keyword SPACE* line_to_eol NEWLINE+ steps examples_sections ;

steps 	:	step* ;

step	:	step_keyword SPACE* line_to_eol NEWLINE+ multiline_arg? ;

examples_sections 
	:	examples+ ;
	
examples 
	:	examples_keyword SPACE* line_to_eol NEWLINE+ table ;

multiline_arg  
	:	table ;

table 	:	table_row+ ;

table_row 
	: 	SPACE* '|' (cell '|')+ SPACE* (NEWLINE+) ;

cell	: 	(~('|' | NEWLINE) .)* ;

tags	: 	tag (SPACE tag)* NEWLINE+ ;

tag 	:  	'@' tag_name=ID ;

comment	
	: 	(comment_line NEWLINE)* ;

comment_line 
	: 	'#' line_to_eol;

line_to_eol 
	: 	(~NEWLINE)* ;

feature_keyword 
	:	'Feature' ':'? ;

scenario_keyword
	: 	'Scenario' ':'? ;

scenario_outline_keyword 
	: 	'Scenario Outline' ':'? ;

step_keyword 
	: 	'Given' | 'When' | 'Then' | 'And' | 'But' ;

examples_keyword 
	: 	'Examples' ':'? ;


ID 	: 	('a'..'z'|'A'..'Z'|'_')+ ;

NEWLINE :  	(('\r')? '\n' )+ ;

SPACE	: 	(' '|'\t')+ {skip();};

I had trouble with the Ruby bindings so I was never quite sure it worked. It was a spike to test the ground for moving away from treetop.
We ended up going with Ragel instead.