Jim,
Here is what I have set in options:
options {
backtrack = true;
memoize = true;
language = C;
output = AST;
ASTLabelType = pANTLR3_BASE_TREE;
}
The null is inside 'ctx' inside 'adaptor' at 'setTokenBoundaries'.
It is inside a function
/**
* $ANTLR start line
* /Users/acondit/source/GCCnv/LatheBranch/trunk/Parser/RS274ngc.g:184:1: line :
( ( line_number )? ( segment )+ K_NEWLINE -> ^( STMT ( segment )+ ) | (
line_number )? K_NEWLINE -> | oword_stmt -> ^( STMT oword_stmt ) );
*/
static RS274ngcParser_line_return
line(pRS274ngcParser ctx)
{
...
}
which I assume, based on the comment, is generated from this rule:
line : line_number? segment+ K_NEWLINE
-> ^(STMT segment+)
| line_number? K_NEWLINE
->
| oword_stmt
-> ^(STMT oword_stmt)
;
The grammar is for parsing an existing language not one of my invention, and
grammatically the newlines delineate a semantic block therefore must be known
by the parser, but empty lines are discarded and therefore should not be in the
tree.
Alan
---
Alan's MachineWorks
1085 Tierra Ct.
Woodburn, OR 97071
Email -- acon...@alansmachineworks.com
www.alansmachineworks.com
Jim wrote--
Please post more information about your grammar, what the null pointer is, etc.
It is hard to interpolate, but the common mistake is not adding output=AST; to
the options, so you do not get a tree adaptor created.
Jim
> -----Original Message-----
> From: antlr-interest-bounces at antlr.org
[mailto:antlr-interest-
> bounces at antlr.org
] On Behalf Of Alan Condit
> Sent: Wednesday, May 19, 2010 11:25 AM
> To: antlr-interest at antlr.org
> Subject: [antlr-interest] null pointer to ADAPTOR->setTokenBoundaries
>
> Help!!!
>
> I am getting a null pointer to setTokenBoundaries in the following line
> of generated code.
> "ADAPTOR->setTokenBoundaries(ADAPTOR, retval.tree, retval.start,
> retval.stop);"
>
> The grammar works under Java. In moving it back to 'C', I changed the
> language option to 'C', added option ASTLabelType=pANTLR3_BASE_TREE;
> and added the necessary includes to compile and link under Objective-C.
>
> Is there anything obvious that I am doing wrong?
>
> Thanks,
> Alan
>
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