[stringtemplate-interest] basic question to template group

[Dieter Frej]

Hi Rabea,

that example made it totally clear. @Ter: I recommend this to be added be to the wiki.

Still two questions are left: 
- in your example you used the parameter "theGroup" in the StringTemplateGroup constructor. What is it used for? 
- what are the advantages (and of course disadvantages) of using one .stg or serveral .st files?

Thanks in advance,

- Daniel



-------- Original-Nachricht --------
> Datum: Mon, 14 Jul 2008 22:55:27 +0200
> Von: Rabea Gransberger <rgransberger at gmx.de>
> An: Dieter Frej <dieter_frej at gmx.net>
> CC: stringtemplate-interest at antlr.org
> Betreff: Re: [stringtemplate-interest] basic question to template group

> Dieter Frej schrieb:
> > Hi,
> > 
> > what I wanted to do was to put all templates (all in all these are
> around 5 templates) in one physical file and use this file to generate my
> output. Following the great number of example on the Internet, I figured that I
> need a template group to realize my requirement
> > 
> > StringTemplateGroup stGroup = new StringTemplateGroup("mygroup",
> "C:\\Users\\xyz\\workspace");
> > StringTemplate st = stGroup.getInstanceOf("junit");
> > st.setAttribute("tests", ts); 
> > System.out.println(st.toString());
> > 
> > I created the junit.st file and placed in the directory specified in the
> constructor of the StringTemplateGroup. In my junit.st I want to call
> another "template method"
> > 
> > junitclass(testheet) ::= <<
> > 
> > public class $tests.name$ {
> > 	
> > 	$m23ethod(rows=tests.rows)$
> > 	
> > }
> > 
> > Putting also
> > 
> > m23ethod(rows) ::= <<
> > 	public void test() {
> > $rows:{ u |
> > 	$u.inputColumns; separator=", "$
> > }$
> > 
> > in junit.st does not working. I get the following exception
> > 
> > Exception in thread "main" java.lang.IllegalArgumentException: Can't
> find template m23ethod.st; context is [junit]; group hierarchy is [mygroup]
> > 
> > Maybe I do not fully get template groups, but why am I required to
> create a separate template for each method I am calling? Or am I doing something
> wrong? (or totally missing the point? also possible ;-)
> 
> You've mixed up the possiblities to create StringTemplate Groups:
> - You may group .st files in a directory
> - You may create a group file (.stg) which contains all the templates.
> 
> Here's an example:
> public class GroupFiles {
> 
> 	public static void main(String[] args) throws IOException {
> 		StringTemplateGroup groupDir = new StringTemplateGroup("theGroup",
> 				"templates/group");
> 
> 		final StringTemplate oneTemplate = groupDir.getInstanceOf("one");
> 		oneTemplate.setAttribute("class", GroupFiles.class);
> 		System.out.println(oneTemplate.toString());
> 
> 		final FileReader reader = new FileReader("templates/group.stg");
> 		StringTemplateGroup groupFile = new StringTemplateGroup(reader);
> 		reader.close();
> 		
> 		final StringTemplate oneTemplate2 = groupFile.getInstanceOf("one");
> 		oneTemplate2.setAttribute("class", GroupFiles.class);
> 		System.out.println(oneTemplate2.toString());
> 	}
> 
> }
> 
> Using the following directory structure:
> templates
>    -group
>     -- one.st
>     -- two.st
>    - group.stg
> 
> Contents of the files:
> one.st:
> ------
> $two(className=class.name)$
> ------
> 
> two.st:
> ------
> $className$
> ------
> 
> group.stg:
> -------
> group theGroup;
> 
> one(class) ::= <<
> <two(className=class.name)>
>  >>
> 
> two(className) ::= <<
> <className>
>  >>
> --------
> 
> Hope this made it a bit clearer.
> 
> Rabea

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