Hello all,
I have a grammar that does a rewrite like so:
bracketedBlock
: '{' stmts=statement* '}' -> ^(Block $stmts)
;
As you can see, the rule is matching multiple statements inside
brackets, like in a typical programming language with blocks - for
example:
{ echo 'hello'; echo 'world'; }
The problem is that it actually produces a tree like this:
64: Block
34: echo
92: 'world'
Whereas I would expect this:
64: Block
34: echo
92: 'hello'
34: echo
92: 'world'
I thought that perhaps the right solution was to add brackets:
bracketedBlock
: '{' stmts=(statement*) '}' -> ^(Block $stmts)
However this produces a runtime error when I run the parser:
Antlr.Runtime.Tree.RewriteEmptyStreamException: token stmts
at Antlr.Runtime.Tree.RewriteRuleElementStream`1._Next()
at Antlr.Runtime.Tree.RewriteRuleTokenStream.NextNode()
It works fine if I spell out the number of blocks explicitly:
bracketedBlock
: '{' s1=statement s2=statement '}' -> ^(Block $s1 $s2)
;
So I was wondering if there is a different way to perform a rewrite
rule that would match multiple elements?
In case it is important, the target here is CSharp2.
Many thanks for any help!
Simon
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