I think you will have to put those three productions in separate rules, but I will look into it more.
Jim > -----Original Message----- > From: antlr-interest-boun...@antlr.org [mailto:antlr-interest- > boun...@antlr.org] On Behalf Of Alan Condit > Sent: Wednesday, May 19, 2010 2:06 PM > To: antlr-interest@antlr.org > Subject: Re: [antlr-interest] null pointer to ADAPTOR- > >setTokenBoundaries > > 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 > > > > > > List: http://www.antlr.org/mailman/listinfo/antlr-interest > Unsubscribe: http://www.antlr.org/mailman/options/antlr-interest/your- > email-address List: http://www.antlr.org/mailman/listinfo/antlr-interest Unsubscribe: http://www.antlr.org/mailman/options/antlr-interest/your-email-address -- You received this message because you are subscribed to the Google Groups "il-antlr-interest" group. To post to this group, send email to il-antlr-inter...@googlegroups.com. To unsubscribe from this group, send email to il-antlr-interest+unsubscr...@googlegroups.com. For more options, visit this group at http://groups.google.com/group/il-antlr-interest?hl=en.
