[antlr-interest] Help with a tree grammar: losing a list of statements

[Pauba, Kevin L]

I have a parser and tree grammar written to add better flow control constructs to an assembly language-like DSL.

Here's the parser grammar rule of interest:

        |       KW_while l=string condition=string r=string statement+ KW_endwhile
                -> ^(KW_while ^(EXPR $l $condition $r) ^(SLIST statement+))

In ANTLRWorks it shows what I expect for an AST using the following text:

while $99 > 0
                let $99 - 1
                let $98 + 1
endwhile

The expected AST includes a tree with a root of KW_while and two children (the EXPR and the SLIST (the list of two statement trees).  I hope that makes sense.

I have a tree-walking grammar that uses "output=template" and "rewrite = true" with the following rule:

        |       ^(KW_while ^(EXPR l=string condition=string r=string) ^(SLIST s+=statement+))
                -> template(lhs={$l.text}, operator={$condition.text}, rhs={$r.text}, stats={$s})
                <<
L:
        ; while <lhs> <operator> <rhs>
        test <lhs> <operator> <rhs> L_END:
        <stats>
        goto L:
L_END:
                >>

I'm doing something wrong as the "<stats>" ends up being null and I get the following output:

L:
        ; while $99 > 0
        test $99 > 0 L_END:
        goto L:
L_END:

What is wrong with my rewrite grammar?

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