[antlr-interest] How to handle Quoted Strings?

[Weiler-Thiessen, David, SASKATOON, Engineering]

> Hi 
> 
> I am having trouble adding Lexer/Parser rules to a grammar that will deal with quoted strings.
> 
> A phrase I would like to parse is:
> 
> create register FAULT_CODE initial value '301'
> 
> I am having trouble with the quoted string '301'.  When I build my AST, I would like to have just the inner value, 301 passed, but when I tried to get the text in my tree grammar, I get the full token with quotes, i.e. '301'.
> 
> This is a portion of my Parser/Lexer grammar where I am trying to define this.
> 
> stringValue
> 	:	SINGLE_QUOTE! (~SINGLE_QUOTE|BACK_SLASH SINGLE_QUOTE)* SINGLE_QUOTE!
> 	;
> 
> SINGLE_QUOTE
> 	:	'\''
> 	;
> 
> BACK_SLASH
> 	:	'\\'
> 	;
> 
> Everything works until I get into my Tree Grammar, and when I request the text of the stringValue rule, I get the leading and trailing quotes, even though there are not passed through to the Tree Grammar.
> 
> What am I doing wrong?  Is there a best practice for dealing with quoted strings, and being able to escaped embedded quotes?
> 
> David Weiler-Thiessen
> Nestlé Purina PetCare
> phone: 306-933-0232
> cell: 306-291-9770
> 
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> 
> 
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