[Python-ideas] User-defined literals

[Nick Coghlan]

On 5 Jun 2015 00:25, "Paul Moore" <p.f.moore at gmail.com> wrote:
>
> On 4 June 2015 at 14:48, Nick Coghlan <ncoghlan at gmail.com> wrote:
> > On 4 June 2015 at 23:06, Paul Moore <p.f.moore at gmail.com> wrote:
> >> As a straw man how about a new syntax (this won't work as written,
> >> because it'll clash with the "<" operator, but the basic idea works):
> >>
> >>     LITERAL_CALL = PRIMARY "<" <any source character except right
> >> angle bracket>* ">"
> >
> > The main idea I've had for compile time metaprogramming that I figured
> > I might be able to persuade Guido not to hate is:
> >
> >    python_ast, names2cells, unbound_names =
> > !(this_is_an_arbitrary_python_expression)
>
> The fundamental difference between this proposal and mine is (I think)
> that you're assuming an arbitrary Python expression in there (which is
> parsed), whereas I'm proposing an *unparsed* string.

No, when you supplied a custom parser, the parser would have access to the
raw string (as well as the name -> cell mapping for the current scope).

The "quoted AST parser" would just be the default one.

Cheers,
Nick.
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