Your s: rule needs to set $st to something too or it will return an empty template :-) Jim
> -----Original Message----- > From: antlr-interest-boun...@antlr.org [mailto:antlr-interest- > boun...@antlr.org] On Behalf Of George Soom > Sent: Wednesday, May 26, 2010 4:01 AM > To: antlr-interest@antlr.org > Subject: [antlr-interest] parsing rules > > Hi, > > I have to rewrite several files with mathematical text in them. Text > substitutions are really simple (e.g. 'a=4' -> 'a:=4;' and similar). > Input is in form: > ---- > a=4 > b=3 > draw(a) > draw(b) > ---- > > Needed output > ----- > a:=4; > b:=3; > draw(a, "constant arguments") > draw(b, "constant arguments") > ---- > > The best option I have found is to use StringTemplate. At chapter 9.3 > in > book 'The Definitive ANTLRD reference' has a suitable example. > To explain my probelm I will add lines from two examples: > Grammar: > > grammar T; > options {output=template;} > s : ID '=' INT ';' -> assign(x={$ID.text},y={$INT.text}) ; > ---lexer part not pasted--- > > Test.java > --header, input, parser-lexer generation etc. not pasted--- > parser.setTemplateLib(templates); // give parser templates > TParser.s_return r = parser.s(); // parse rule s > StringTemplate output = r.getTemplate(); > System.out.println(output.toString());// emit translation > > This will work fine. But if I change rule s to > s: assign+; > assign: ID '=' INT ';' -> assign(x={$ID.text},y={$INT.text}) ; > > I have to call parse.assign() to get correct results. How can i still > parse > starting from rule 's' and get desired output? > > George > > > 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.
