The AST operators are the most efficient manner:
localVariableDeclaration
: LOCAL^ variableDeclarationList
;
variableDeclarationList
: variableDcl ( ','! variableDcl )*
;
Or use rewrites:
localVariableDeclaration
: LOCAL variableDeclarationList -> ^(LOCAL variableDeclarationList)
;
variableDeclarationList
: variableDcl ( ',' variableDcl )* -> variableDcl+
;
-----Original Message-----
From: antlr-interest-boun...@antlr.org
[mailto:antlr-interest-boun...@antlr.org] On Behalf Of Graham Mer
Sent: Tuesday, April 05, 2011 4:40 PM
To: antlr-interest@antlr.org
Subject: [antlr-interest] AST cardinality from called rules
Hello list,
The following rule generates the AST that I want:
localVariableDeclaration
: LOCAL variableDcl ( ',' variableDcl )* -> ^(LOCAL variableDcl)+
;
But how do I generate an equivalent AST if the variableDcl list is not in
the localVariableDeclaration rule, as in the following fragment?
localVariableDeclaration
: LOCAL variableDeclarationList
;
variableDeclarationList
: variableDcl ( ',' variableDcl )*
;
I want to produce a set of ^(LOCAL variableDcl) subtrees, but I want to
reuse the variableDeclarationList from other rules, so I'd rather not inline
it.
Thanks!
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