[stringtemplate-interest] Conditionals

[Terence Parr]

hi. My new rule of thumb is to avoid conditionals if possible. The way to do that is to define "do some int thing" and the others as separate templates. then, your code generator (the controller/model) then informs Foo it has another element to add:

Foo(type, a, b) ::= <<
class Foo {
   <type> foo;
    <statements>
}
>>
 much cleaner
Ter
On Sep 1, 2011, at 3:35 PM, Jiwon Seo wrote:

Hi,

I'm using stringtemplate for code generation.
One thing I need to do is to generate different code based on the type
of a variable, like following:

Foo(type, a, b) ::= <<
class Foo {
   <type> foo;

   <if (type=="int")>
      do some int thing
   <elseif (type=="String">
     do some string thing
   <endif>
}
>> 

So far, I could somehow use the map (such as, EqMap ::= ["int": "==" ,
default: ".equals"] ) but this is something that cannot be done using
the map. So I ended up using a lot of variables like following:

Foo(type, intType, stringType, ... a, b) ::= <<
class Foo {
   <type> foo;

   <if (intType)>
      do some int thing
   <elseif (stringType)>
     do some string thing
   <endif>
}
>> 

Is there any other ways of doing this?

-Jiwon
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