[stringtemplate-interest] who uses regions?

[Sam Harwell]

The following is allowed and works like you'd expect:

foo() ::= <<
<@bar()>
>>

@foo.bar() ::= <<
<@subbar()>
>>

@foo.bar.subbar() ::= <<
Yay!
>>

The following is not allowed:

foo() ::= <<
<@bar><@subbar>Nay!<@end><@end>
>>

The following both produce empty output but foo2 does not print any message
about a missing template:

foo() ::= <<
<bar()>
>>

foo2() ::= <<
<@bar()>
>>


-----Original Message-----
From: stringtemplate-interest-bounces at antlr.org
[mailto:stringtemplate-interest-bounces at antlr.org] On Behalf Of Terence Parr
Sent: Thursday, June 30, 2011 2:59 PM
To: stringtemplate-interest Template
Subject: Re: [stringtemplate-interest] who uses regions?


On Jun 30, 2011, at 12:39 PM, Sam Harwell wrote:

> I actually came up with an idea last week concerning this, but figured 
> you were done looking at regions so I didn't mention it. Looks like 
> that might not be the case anymore. :)
> 
> Summary of how it could work:
> 
> * Get rid of explicit/implicit/embedded regions. Regions are always 
> defined explicitly, and a region reference is just a normal template
reference.

How do you define explicitly?  Can you give an example?
T

> * Allow a template definition to be formatted as "@dotted.ident.ifier".
> * For the above rule, the template name is "@dotted.ident.ifier". The 
> character '@' is a new ID start char. The characters '-', '_', and '.' 
> are ID characters (but not ID start chars).
> * A template expression <@name> refers to @currentTemplate.name.
> 
> In the implementation, the notion of regions is now gone. The @ syntax 
> is just shorthand for adding "@currentTemplateName." to the name of 
> the template to lookup, which makes them effectively the same as they 
> used to be since the automatic insertion of the current template name 
> means you can only reference them within a specific template.
> 
> If <@name()> appears within a template named "@other.item", the extra 
> @ is dropped when forming "@other.item.name".
> 
> When looking up a template, if the name starts with @ and isn't found, 
> return an empty template without printing an error message (covers the 
> case where implicit regions were used before).
> 
> Sam
> 
> -----Original Message-----
> From: stringtemplate-interest-bounces at antlr.org
> [mailto:stringtemplate-interest-bounces at antlr.org] On Behalf Of 
> Terence Parr
> Sent: Thursday, June 30, 2011 1:56 PM
> To: stringtemplate-interest Template
> Subject: [stringtemplate-interest] who uses regions?
> 
> they are driving me nuts in STv4 implementation. i'm not even sure 
> what they mean anymore with subdirs and /a/b/c/d style references with 
> inheritance mixed in.
> 
> I don't use anymore myself. I released I needed them in ANTLR v3 code 
> gen due to forcing too much of logic into templates.  v4 does all 
> thinking in code and constructs internal model and then just makes 
> templates and fills and renders.
> 
> i'd love to eject regions but not if people use.  I guess ANTLR 3.4 
> needs them...hmm...
> 
> Ter
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> 

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