moduleFromGrammar coupled to parse tree

[Robert Collins]

Which is fine, but it would rock if there was a
moduleFromSource(...)

and moduleFromGrammar became:

return moduleFromSource(writePython(tree), className, superclass, globalsDict)

(I've had to write nearly the identical function, for a very similar reason, for a language implemented via pymeta).

[Robert Collins (lifeless)]

Oh, it would need modname, filename and the superclasss bits generalised too for purity. But not for practicality ;)

[Robert Collins (lifeless)]

def moduleFromSource(source, className, superclass=None, globalsDict=None,
    registerModule=True):
    modname = "pymeta_grammar__" + className
    filename = "/pymeta_generated_code/" + modname + ".py"
    mod = module(modname)
    if globalsDict:
        mod.__dict__.update(globalsDict)
    mod.__name__ = modname
    if superclass:
        mod.__dict__[superclass.__name__] = superclass
        mod.__dict__["GrammarBase"] = superclass
    mod.__loader__ = GeneratedCodeLoader(source)
    code = compile(source, filename, "exec")
    eval(code, mod.__dict__)
    fullGlobals = dict(getattr(mod.__dict__[className], "globals", None) or {})
    fullGlobals.update(globalsDict)
    mod.__dict__[className].globals = fullGlobals
    if registerModule:
        sys.modules[modname] = mod
    linecache.getlines(filename, mod.__dict__)
    return mod.__dict__[className]

This is a sketch - it is what I'm using. Note that the modname and filename are not parameterised - functionally, it all works :)

[Robert Collins (lifeless)]

hah, I lie. I need one further change - a filename decoupled from the entry point I think; my language has a bunch of anonymous closures I'm compiling separately, so they all walk over each other atm. Any of the obvious fixes would do :)

[Allen Short (washort)]

fixed here :)
http://bazaar.launchpad.net/~washort/pymeta/ng/revision/108