ANTLR trees can have many children. Your javaSource rule will be fine, but because all elements are optional you need:
J: ^(V etc) | V // Empty translation unit ; It is easier to see how the tree is going if you break it down and do not try to create sub trees in a rewrite rule. When you create subtrees, the created node does not properly have the start and end tokens for the sub tree and so on because these happen at rulePostProcessing, not within a rewrite. Don’t use imaginary nodes unless they are necessary to create an unambiguous tree, so the DOT token is just fine as a root node for each element of a compound and you probably only need the imaginary as a root for the whole reference. Jim From: antlr_bill [mailto:[email protected]] Sent: Sunday, October 04, 2009 10:07 AM To: Jim Idle Cc: [email protected] Subject: [SPAM] Re:Re: [antlr-interest] help on rewritting the tree Hi Jim, thanks for you quick reply ! do you mean i should break them into pieces ? cause the tree structure only can have two children in maximum if so ,so how about this one? break them too ? javaSource : (packageDeclaration)? (importDeclaration)* (typeDeclaration)* ->^(V packageDeclaration? importDeclaration* typeDeclaration*) ; here means the java source file can contain package and import and type ,three kinds of element but i wrote that tree like that , is it right ? any article about this ? i read the book of antlr many times on the tree grammer ,but still didnt get all of it thanks again! BILL 在2009-10-05，"Jim Idle" <[email protected]> 写道： -----原始邮件----- 发件人:"Jim Idle" <[email protected]> 发送时间:2009年10月5日 星期一 收件人:"[email protected]" <[email protected]> 主题:Re: [antlr-interest] help on rewritting the tree a: b -> ^(V b) ; b : part (DOT^ part )* ; part: ID( ABC )? ; Jim From: [email protected][mailto:[email protected]]on Behalf Ofantlr_bill Sent:Sunday, October 04, 2009 8:56 AM To:[email protected] Subject:[antlr-interest] help on rewritting the tree can someone please help on this ? i have an rule like this : a: : ID( ABC )? (DOT ID (ABC)? )* ; how to rewrite it into a tree grammer ? --~--~---------~--~----~------------~-------~--~----~ You received this message because you are subscribed to the Google Groups "il-antlr-interest" group. To post to this group, send email to [email protected] To unsubscribe from this group, send email to [email protected] For more options, visit this group at http://groups.google.com/group/il-antlr-interest?hl=en -~----------~----~----~----~------~----~------~--~---
List: http://www.antlr.org/mailman/listinfo/antlr-interest Unsubscribe: http://www.antlr.org/mailman/options/antlr-interest/your-email-address
