[stringtemplate-interest] Help with recursive template application

[Vincent Dupuis]

If you have time to try it, here is the code:

Main.java :

package javaapplication2;

import java.io.FileNotFoundException;
import java.io.FileReader;
import java.io.IOException;
import java.util.ArrayList;
import java.util.List;
import org.antlr.stringtemplate.StringTemplate;
import org.antlr.stringtemplate.StringTemplateGroup;

public class Main
{
    public static void main(String[] args)
    {
        StringTemplateGroup stg;
        stg = openTemplateFile("templates.stg");

        StringTemplate aClass;
        StringTemplate aClass2;
        List list = new ArrayList();
        List list2 = new ArrayList();

        aClass = new StringTemplate();
        aClass.setAttribute("name", "A");
        list.add(aClass);

        aClass2 = new StringTemplate();
        aClass2.setAttribute("name", "InnerB");
        list2.add(aClass2);

        aClass = new StringTemplate();
        aClass.setAttribute("name", "B");
        aClass.setAttribute("listOfSubClasses", list2);
        list.add(aClass);

        aClass = new StringTemplate();
        aClass.setAttribute("name", "C");
        list.add(aClass);

        StringTemplate st = stg.getInstanceOf("mainTemplate");
        st.setAttribute("listOfClasses", list);

        System.out.println(st.toString());
    }

    private static StringTemplateGroup openTemplateFile(String fileName)
    {
        try
        {
            FileReader fileReader;
            fileReader = new FileReader(fileName);

            StringTemplateGroup templates;
            templates = new StringTemplateGroup(fileReader);

            fileReader.close();

            return templates;
        }
        catch (FileNotFoundException e)
        {
            System.err.println(e.toString());
            System.exit(1);
            return null;
        }
        catch (IOException e)
        {
            System.err.println(e.toString());
            System.exit(1);
            return null;
        }
    }
}


templates.stg :

group templates;

mainTemplate(listOfClasses) ::= <<
<listOfClasses:classDeclaration(parent="TopClass"); separator="\n">
>>

classDeclaration(parent) ::= <<
class <it.name> : public <parent>
{
    <it.listOfSubClasses:classDeclaration(parent=it.name); separator="\n">
}
>>


Expected output for class B :

class B : public TopClass
{
    class InnerB : public B
    {
    }
}


V

From: parrt at cs.usfca.edu
To: vincedupuis at hotmail.com
Subject: Re: [stringtemplate-interest] Help with recursive template application
Date: Fri, 21 Aug 2009 17:09:12 -0700

verrrry strange. not sure what's up.Ter
On Aug 21, 2009, at 4:24 PM, Vincent Dupuis wrote:I retried just to be sure, but it doesn't work.

I removed the iter parameter and use <it> in classDeclaration 
and I still don't get the good output. (see blow).

V


> CC: stringtemplate-interest at antlr.org
> From: parrt at cs.usfca.edu
> To: vincedupuis at hotmail.com
> Subject: Re: [stringtemplate-interest] Help with recursive template application
> Date: Fri, 21 Aug 2009 11:21:35 -0700
> 
> 
> On Aug 21, 2009, at 6:40 AM, Vincent Dupuis wrote:
> 
> > Terence, thanks for your reply.
> >
> > After I read your comments, I tried many combination to make it work
> > and the only way was to explicitly assign parameters to the template 
> > like this:
> >
> > group templates;
> >
> > mainTemplate(listOfClasses) ::= <<
> > <listOfClasses:classDeclaration(iter=it, parent="TopClass"); 
> > separator="\n">
> > >>
> 
> > <listOfClasses:classDeclaration(parent="TopClass"); separator="\n">
> 
> and
> 
> > classDeclaration(parent) ::= <<
> 
> will work if youuse <it> in classDeclaration.
> 
> >
> > classDeclaration(iter, parent) ::= <<
> > class <iter.name> : public <parent>
> > {
> > <iter.listOfSubClasses:classDeclaration(parent=iter.name, 
> > iter=it); separator="\n">
> > }
> > >>
> >
> > Notice that the parameters are reversed in the second call to 
> > classDeclaration().
> > It doesn't work if I don't reverse them!?
> 
> nor should you expect it to. no assumed order of operations even in 
> param list. it has to pick one and it does in order.
> 
> T
> 
> >
> > Anyway it works, but I don't know if it's normal.
> > Maybe I missed something.
> >
> > Vincent
> >
> >
> >
> > > CC: stringtemplate-interest at antlr.org
> > > From: parrt at cs.usfca.edu
> > > To: vincedupuis at hotmail.com
> > > Subject: Re: [stringtemplate-interest] Help with recursive 
> > template application
> > > Date: Thu, 20 Aug 2009 11:53:22 -0700
> > >
> > >
> > > On Aug 19, 2009, at 6:28 PM, Vincent Dupuis wrote:
> > >
> > > > Hi,
> > > >
> > > > I'm trying to pass a "parent" value in a recursive template
> > > > application
> > > > but without success. Here are my templates:
> > > >
> > > > group templates;
> > > >
> > > > mainTemplate(listOfClasses) ::= <<
> > > > <listOfClasses:classDeclaration("TopClass"); separator="\n">
> > > > >>
> > >
> > > you are passing to parameters here: the iterated value and the 
> > string.
> > > If there is one parameter, the iteration operator sets that sole
> > > parameter to the iterated value.
> > > T
> > >
> > > >
> > > > classDeclaration(parent) ::= <<
> > > > class <it.name> : public <parent>
> > > > {
> > > > <it.listOfSubClasses:classDeclaration({<it.name>});
> > > > separator="\n">
> > > > }
> > > > >>
> > > >
> > > > Considering A, B, and C classes are TopClass and that BB class 
> > is an
> > > > inner class of B.
> > > >
> > > > and the output is...
> > > >
> > > > class A : public TopClass
> > > > {
> > > > }
> > > > class B : public TopClass
> > > > {
> > > > class BB : public BB
> > > > {
> > > > }
> > > > }
> > > > class C : public TopClass
> > > > {
> > > > }
> > > >
> > > >
> > > > Why I don't get the right value for class BB ?
> > > > Like:
> > > >
> > > > class BB : public B
> > > > {
> > > > }
> > > >
> > > >
> > > > Somebody knows why?
> > > >
> > > > Thanks,
> > > >
> > > > Vince
> > > >
> > > >
> > > > Créez un personnage à votre image pour votre WL Messenger Venez 
> > voir
> > > > _______________________________________________
> > > > stringtemplate-interest mailing list
> > > > stringtemplate-interest at antlr.org
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> > >
> >
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> > de vos disques durs.
> 

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