Re: [eclipsefp-develop] Code Assist - Language Model

[Leif F. <lfr...@in...>]

Thiago Arrais wrote:
> Leif,
>
> Some questions below.
>
> On 4/25/06, Leif Frenzel <lfr...@in...> wrote:
>   
>> There is very good background information about how the Java Model works
>> in 'Contributing to Eclipse', by Erich Gamma and Kent Beck, in the third
>> part of the book.
>>     
>
> I will definitely take a look at that. Actually, there has been some
> time it is on my to read list. Thought it was outdated, but have been
> pointed to it so much times that I think it is worth the read.
>   
That's true, many of the passages are no longer completely correct for
Eclipse 3 and higher. The third part is more a general discussion of the
Design patterns that were put to work in the different parts. That still
applies and is definitely worth the read :-)

>   
>> So, what you would do to access other files in the workspace, would be
>> roughly:
>>
>> - get the editor input, cast to IFIleEditorInput, get the IFile
>> - get the IJavaElement for the IFile using JavaCore.create( IFile )
>> - that you can cast (probably, I'm just writing from faint memories at
>> the moment :-) to ICompilationUnit
>> - the ICompilationUnit you can use to query IField, IMethod etc. things
>> from the model, or you can request a complete AST of the source file
>>     
>
> Questions:
>
> We need to add something like that support on EclipseFP, right? I
> think there is already some work done on that direction, and I will
> certainly take a look at the code, but is there any framework support
> for this on Eclipse?
>   
Not really. This is something that was discussed a while ago, but it
came to nothing. What is already in EclipseFP is mostly just the
interfaces for the language model, but there is no such thing as a proxy
mechanism there, which is probably tricky ...

> What about context-sensitive information? I imagine JDT has an indexed
> internal model that it keeps in sync with the resources (I am guessing
> that based on the the extremely fast performance for things like Java
> Search). 
Yes, afaik that's exactly how it works.

> Does anyone know how to query that model? For instance, given
> a method name prefix (that will map almost directly to our function
> names) how do I know of all complete methods that are available (or
> can be easily made available, by adding an import statement or
> whatever) on the current context?
>   
Hm, I have never looked that deeply into JDT in particular. I guess it
would be a good approach to have a look at one of the simpler
refactoring implementations, because what there is needed is exactly
such queries. Btw: my article about the language toolkit is now
available in English too, thanks to the Eclipse people :-) It can be
found here:

http://www.eclipse.org/articles/Article-LTK/ltk.html

Ciao,
Leif

> Cheers,
>
> Thiago Arrais
>
>
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