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[Xtend] Relative Qualified Names in my Template [message #716024]

Tue, 16 August 2011 04:35

Eclipse User

Hi again.

I want to produce Java Classes of my DSL files. In my grammar it's possible to reference elements within expressions.

The built in scope provider optimizes full qualified names perfectly (relative to the current position). I want the same behavior during Java code generation.

I have a set of rules for the generation:
1. A global package for generation is set: at.myproject.lib
2. Each file gets an own subpackage: at.myproject.lib.$file
3. Global Constants are written to a globals class: at.myproject.lib.${file}.${file}Globals
4. Each Type Declaration is written to it's own class: at.myproject.lib.${file}.${type-name}

Its just like a qualified name generator. My idea was to create a new IQualifiedNameProvider for java output and use it during code-generation. (<<myelement.javaQualifiedName>>)

But this would lead me to the problem that all names are fully qualified even if they are local variables:

module test; 

type MyType {
   int Size;
   int Test = Size + 1;
}

becomes to:

package at.myproject.lib.test;

class MyType {
   private int size;
   private int test = at.myproject.lib.test.MyType.size;
}

Is there a way to use an own qualified name provider during generation which gets optimized like it's done within the dsl itself during scoping?

Greetings Daniel

[Updated on: Tue, 16 August 2011 04:53] by Moderator

Re: [Xtend] Relative Qualified Names in my Template [message #716032 is a reply to message #716024]

Tue, 16 August 2011 04:56

Eclipse User

Hi,

the idea of the IQualifiedNameProvider is to provide the fully qualified name (a globally valid name, all optimisations are done by other components). If I was to solve this on a low level basis, I would write an extension that calculates the name of an object relative to a context object, that is <<myelement.relativeNameTo(contextObject)>>. You would then calculate the java name of the reference to Size relative to MyType.

Alex

Re: [Xtend] Relative Qualified Names in my Template [message #716040 is a reply to message #716032]

Tue, 16 August 2011 05:23

Eclipse User

Hi Alex.

Okay, therefore I will need to write everything myself. I thought there already might be such a system for creating qualified names during generation.

One of the next steps will be to create import statements instead of writing fully qualified names everywhere in my generated file.

How did you solve this problem in Xtend/Xbase itself? Does this feature come with the Jvm integration or did you solve the "relative" qualified names by yourself?

[Updated on: Tue, 16 August 2011 05:28] by Moderator

Re: [Xtend] Relative Qualified Names in my Template [message #716042 is a reply to message #716040]

Tue, 16 August 2011 05:32

Eclipse User

Hi,

actually for Xbase there already is an ImportManager (see ImportManager and IAppendable). Check if there is some indication as to the usage in the DomainmodelExample shipped with Xtext. As to your last question, I did not solve the problem. I said "if I was to solve", meaning "if I had to do it".

Alex

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