[stringtemplate-interest] multivalue checking

[Kay Roepke]

On 25. May 2006, at 22:13 Uhr, John RW wrote:

> So it boils down to checking if any of the attributes has certain  
> value. I don't know how to do that in stringtemplate.

Depending on the template lexer you use (if you don't know, it's the  
one with the $-signs ;)) you can do this:

classDump:/tmp kroepke$ cat ST.java
import org.antlr.stringtemplate.*;

public class ST {
         public static void main(String[] args) throws Exception {
	        StringTemplate st = new StringTemplate("foo ::= \"$if(foo) 
$foo exists$else$foo is fubar$endif$\"");
	        st.setAttribute("foo", null);
	        System.out.println(st.toString());
	}
}


In other words: use $if(namespace)$namespace is not null$endif$ to  
check for a value.

HTH,

-k