[antlr-interest] Re: tree parser generating templates

[duboimat at iro.umontreal.ca]

Quoting Sohail Somani <sohail at taggedtype.net>:

> On Thu, 2005-12-15 at 14:01 -0500, duboimat at iro.umontreal.ca wrote:
>> >
>> > On Dec 15, 2005, at 10:24 AM, duboimat at iro.umontreal.ca wrote:
>> >> class LangWalker extends TreeParser;
>> >> {
>> >> StringTemplateGroup group; TextReader str;
>> >> StringTemplate program_st,header_st,block_st,thread_st,
>> >> assign_st,plus_st,moins_st,div_st,star_st;
>> >> StringTemplate code;
>> >>
>> >> public void init()
>> >> 	{
>> >> 	str = new StreamReader("program.st");
>> >> 	group= new StringTemplateGroup(str);
>> >
>> > Ok, first thing:use a group file format and StringTemplateGroup.  See
>> >  the article I have up on using ANTLR+ST.
>> >
>> >>        ...
>> >>
>> >> To build the program I have to put a template into another one.
>> >> if i build lines I have to regroup it to build a block .
>> >>
>> >> It work only when i use st for a subset of the program . I can't
>> >> regroup all
>> >> subset to built a program without having repetition from another
>> >> subset with a
>> >> new value. May be a need to reset the template with its value.
>> >
>> > I have that functionality but I've never once used it...
>> >
>> >> Is there another to do a manually request in v2?
>> >
>> > see the article :)
>> >
>> > Ter
>> >
>> I have seen this article
>> Language Translation Using ANTLR and StringTemplate
>> I have begun my project with this article
>>
>> my group file is included in program.st file.
>> In my program.st
>>
>> group sim;
>> program(header,block) ::=<< Created by $header$   Program: $block$ >>
>> header()::=<<header>>
>> block(thread) ::=<< Block: $thread$ >>
>> thread(statement) ::= <<Thread : >>
>> ...
>> assign(lhs,rhs) ::= << $lhs$ = $rhs$; >>
>> plus(lhs,rhs) ::= << $lhs$ + $rhs$ >>
>> moins(lhs,rhs) ::= << $lhs$ - $rhs$ >>
>> div(lhs,rhs) ::= << $lhs$ / $rhs$ >>
>> star(lhs,rhs) ::= << $lhs$ * $rhs$ >>
>>
>> In my example , the program is composed of block, the block is composed of
>> thread , the thread is composed of statement ...
>>
>> The article doesn't show how to use antlr + st with tree.
>> if I call template from tree parser class
>> like
>>         code = template("variable");        }
>>         code.setAttribute("type", t);
>>         code.setAttribute("name", d);
>>
>> String template will not regroup all template together with its 
>> value to get a
>> final code.
>
> You have to do something like:
>
> class StringTemplateGenerator extends SomeParser;
>
> myTreeRule[returns StringTemplate ret=template("my_language_element");]
> 	: ... {ret.setAttribute("my_attribute",some_value);}
> 	;
>
> then in the driver:
>
> StringTemplateGenerator stgen = new StringTemplateGenerator(...);
>
> StringTemplate result = stgen.myTreeRule();
> System.out.println(result);
>
> This is the way I would've liked to have done it, but I did it like the
> article told me to and did it in the parser.
>
> Oh well, I'll fix it in my 0.2 release :)
>
> Sohail
>
Thank for your help Ter and Sohail.
I have rewritten my code according to your comments and it 's a better way.
I connected srting template directly in my tree walker.

thank a lot
mat


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