[antlr-interest] Having a problem with AST construction: rule fromClause alt 1 uses rewrite syntax and also an AST operator

[Paul McKee]

That did it, and I understand why as well!
Thanks very much Ter!

----- Original Message ----- 
From: "Terence Parr" <parrt at cs.usfca.edu>
To: "Paul McKee" <paul.mckee at mckeetech.com>
Cc: <antlr-interest at antlr.org>
Sent: Wednesday, February 11, 2009 10:30 PM
Subject: Re: [antlr-interest] Having a problem with AST construction: rule 
fromClause alt 1 uses rewrite syntax and also an AST operator


> Hi Paul, don't use ! and ->.  Just remove ! here and life is good.
> Ter
> On Feb 11, 2009, at 2:22 PM, Paul McKee wrote:
>
>>
>>
>> Hello:
>>
>> I'm a Newbie to ANTLR and I hope someone can offer me some advice.  I'm 
>> trying to create a T-SQL Parser with output as an AST. I have:
>> options {
>>  backtrack=true;
>>  output=AST;
>> }
>> Lines 410 and 411 of the grammar file are:
>>
>> fromClause  :
>>  FROM! tableSource
>>  ( COMMA! tableSource )* -> ^(FROM tableSource)+
>>  ;
>>
>> And this generates the error mesages:
>>
>> [21:43:33] error(165): Z:\tsql\Tsql_a1.g:410:2: rule fromClause alt  1 
>> uses rewrite syntax and also an AST operator
>> [21:43:33] error(165): Z:\tsql\Tsql_a1.g:411:4: rule fromClause alt  1 
>> uses rewrite syntax and also an AST operator
>>
>> However, when I split this into two rules as follows:
>>
>> fromClause
>>  : fromClause1 -> ^(FROM fromClause1);
>> fromClause1  :
>>  FROM! tableSource
>>  ( COMMA! tableSource )*  ;
>>
>> Then it all works fine.
>> I am using the latest version of ANTLRworks.
>> Any help or ideas would be much appreciated.
>>
>> Best Regards
>>
>> Paul McKee
>>
>>
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>
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