[antlr-interest] Antlrworks quirky behaviour ?

[Pranab Dhar]

Hi,

        I am noticing a weird behaviour in antlrworks. It is with this
grammar while building the AST.

 

 

postfixOp:

      '.'

      | '@'

;

postfixExpr :

      (

          primaryExpr -> primaryExpr

      )

    (

        (lc=TOK_LBRACK i=index TOK_RBRACK) ->
^(ARRAY_INDEX[$lc,"ARRAY_INDEX"] $postfixExpr $i)

        |

        (

               p=postfixOp  li=labelIdentifier

               (

                   al=argList ->
^(FUNCTION_EXPRESSION[$li.start,"FUNCTION_EXPRESSION"] ^($p $postfixExpr
$li) $al )

 

                   |   /* NOTHING */  -> ^($p $postfixExpr $li)

               )

        )

    )*

    ;

 

When I use the grammar above the AST tree shown in antlrworks does not
show the tree below the FUNCTION_EXPRESSION while the stringTree is
correctly shown as a result of the  getTree() api call.

(PROJECTION (ALIAS_CLAUSE (FUNCTION_EXPRESSION (. Datetime now)
ARG_LIST)))

 

When the grammar is modified to remove the AST rewrite rules and use ^ |
operators the tree is shown  correctly in the antlrworks.

 

The dilemma is which one to believe is correct.

 

Pranab

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