explore current scope, or other hack
denis.spir at gmail.com
Mon Nov 15 11:59:23 PST 2010
On Mon, 15 Nov 2010 12:44:24 -0500
bearophile <bearophileHUGS at lycos.com> wrote:
> > 1. name objects automatically
> > I need some objects to know their name (as field on themselves). the only solution I can else imagine is for the user write:
> > x = ...;
> > x.name = "x";
> What if you have two or more references to the same object?
I'm not sure what you mean. The said objects are patterns (instances of a Pattern class hierachy). And indeed, they are multiply referenced (that's precisely the point of writing a grammar ;-).
Their names are used everywhere:
* stand-alone pattern output
* super-pattern output (subpatterns are replaced by their name, else output explodes) eg
* inside nodes they generate (eg allow discrimination between choices)
* error output ("expected operand at position...")
* result output for testing
> Regarding your generic question, I'd like DMD to have more static introspection, for for now ...
Dynamic introspection would do the job for me, I guess. In python, would be like (untested):
def namePatterns (scope = var()):
for (name,obj) in scope:
if isinstance(obj, Pattern):
obj.name = name
Don't know how static would help better.
Any idea how else to write somethink analog to format()?
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