[antlr-interest] gunit syntax for tree walker with a flat list of nodes

[Kaleb Pederson]

Here's a simple gunit test for a portion of my grammar which generates a flat 
list of nodes:

objectOption walks objectOption:
	<<one:"value">> -> (one "value")

In the above, I purposefully left out the caret (i.e. ^(one "value)) since 
it's a flat list of nodes and not a tree.  Another option which seems intuitive 
is to leave off the parenthesis, like this:

objectOption walks objectOption:
	<<one:"value">> -> one "value"

In the first case the parenthesis cause an error

1 failures found:
test2 (objectOption walks objectOption, line17) - 
expected: (one \"value\")
actual: one \"value\"

And in the second case I get an exception:

line 17:20 no viable alternative at input 'one'
line 17:24 missing ':' at 'value'
line 0:-1 no viable alternative at input '<EOF>'
java.lang.NullPointerException
        at org.antlr.gunit.OutputTest.getExpected(OutputTest.java:65)
        at org.antlr.gunit.gUnitExecutor.executeTests(gUnitExecutor.java:245)
        ...

What is the correct way to match a flat tree?

Thanks.

--
Kaleb Pederson

Blog - http://kalebpederson.com
Twitter - http://twitter.com/kalebpederson