Le 04/08/2015 10:08, Clément Bera a écrit :
Hello Pharoers,
I'd like to do something a bit crazy and I think it's possible in Pharo
so I'm asking for advises here.
I would like to have packages / hierarchy of classes in Pharo that have
methods written with a different syntax.
I know that syntax coloring and most refactoring tools work on AST. So
is it possible, for a given class, to override #parser or #parserClass
class side in a similar way that you can override #compiler and
#compilerClass, and from then on, the class methods will use this parser
instead of RBParser to be parse its methods source code to the AST in
the compilation chain and for syntax coloring (hence with full
compatibility with the class browser) ?
It depends on how the system browser is implemented, but it sounds doable.
I would be able to do that fairly easily on AltBrowser, since commands
(all menus and shortcuts, including refactorings) are delegated to the
node you are using (i.e. the class, the method, the command) in the
browser. Syntax coloring is sort of keyed to the node (i.e. a comment
node doesn't do syntax coloring the way a method node does).
I am talking about another syntax that would be parsed to the same AST
for now, though as the compiler can be changed too, I guess a complete
separate compilation chain and AST could work fine if the AST has common
APIs with RB for the refactoring browser and syntax coloring.
No, that wouldn't work for refactoring. I believe RB apply refactorings
by source code changes, and so it would introduce the old syntax in the
middle of the new.
If you use a SmaCC-based parser for the new syntax, then you would get
along the refactoring engine for that syntax and AST.
Writing a syntax coloring tool from a Parser is extremely easy,
independently of the way this parser is implemented. It can be
auto-generated; I did some experiments with Usman on that, and they were
very interesting, in particular about the speed of the resulting syntax
coloring tool.
What do you think ?
It is a good way to "mold" the browser, in a way. Doru, what do you think?
Thierry
