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lexpad.pmc
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lexpad.pmc
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/*
Copyright (C) 2007-2009, Parrot Foundation.
$Id$
=head1 NAME
src/pmc/lexpad.pmc - LexPad PMC
=head1 DESCRIPTION
These are the vtable functions for the lexpad PMC.
=head2 Functions
=over 4
=cut
*/
/*
* LexPad provides a Hash interface for lexical fetch/store
* needed
*
* struct_val ... Context *ctx
* pmc_val ... LexInfo
*/
/* HEADERIZER HFILE: none */
/* HEADERIZER BEGIN: static */
/* HEADERIZER END: static */
pmclass LexPad provides hash no_ro auto_attrs {
ATTR PMC *lexinfo;
ATTR PMC *ctx;
VTABLE void init() {
Parrot_ex_throw_from_c_args(INTERP, NULL, EXCEPTION_INVALID_OPERATION,
"Cannot create a LexPad PMC without an initializer");
}
/*
=item C<init_pmc(PMC *lexinfo)>
Initialize the LexPad PMC and remember the associate
lexinfo.
=item C<void set_pointer(void *)>
Initialize the LexPad PMC and remember the associate context.
=item C<INTVAL elements()>
Returns the number of elements in the hash.
=item C<INTVAL exists_keyed(PMC *name)>
=item C<INTVAL exists_keyed_str(STRING *name)>
Returns whether a lexical C<name> exists in the hash.
=item C<PMC *get_pmc_keyed_str(STRING *name)>
=item C<PMC *get_pmc_keyed(PMC *name)>
Return the lexical with the given name, or NULL (not PMCNULL), if the
lexical doesn't exist.
=item C<void set_pmc_keyed(PMC *name, PMC *value)>
=item C<void set_pmc_keyed_str(STRING *name, PMC *value)>
Set the lexical with the given name to value. If the lexical name
doesn't exist, it is created.
=item C<PMC *get_lexinfo()>
Return the LexInfo PMC, if any or a Null PMC.
=cut
*/
VTABLE void init_pmc(PMC *lexinfo) {
SET_ATTR_lexinfo(INTERP, SELF, lexinfo);
}
VTABLE void set_pointer(void *ctx) {
SET_ATTR_ctx(INTERP, SELF, (PMC *)ctx);
}
VTABLE INTVAL elements() {
PMC *info;
GET_ATTR_lexinfo(INTERP, SELF, info);
return parrot_hash_size(INTERP,
(Hash *)VTABLE_get_pointer(INTERP, info));
}
VTABLE INTVAL exists_keyed_str(STRING *name) {
PMC *info;
GET_ATTR_lexinfo(INTERP, SELF, info);
return parrot_hash_get_bucket(INTERP,
(Hash *)VTABLE_get_pointer(INTERP, info), name) != 0;
}
VTABLE INTVAL exists_keyed(PMC *name) {
STRING * const s = VTABLE_get_string(INTERP, name);
return SELF.exists_keyed_str(s);
}
VTABLE PMC *get_pmc_keyed_str(STRING *name) {
PMC * info;
Hash * hash;
PMC * ctx;
HashBucket * b;
INTVAL regno;
GET_ATTR_lexinfo(INTERP, SELF, info);
GET_ATTR_ctx(INTERP, SELF, ctx);
hash = (Hash *)VTABLE_get_pointer(INTERP, info);
b = parrot_hash_get_bucket(INTERP, hash, name);
if (!b)
return NULL;
regno = (INTVAL) b->value;
return CTX_REG_PMC(ctx, regno);
}
VTABLE PMC *get_pmc_keyed(PMC *name) {
STRING * const s = VTABLE_get_string(INTERP, name);
return SELF.get_pmc_keyed_str(s);
}
VTABLE void set_pmc_keyed_str(STRING *name, PMC *value) {
PMC * info;
Hash * hash;
PMC * ctx;
HashBucket * b;
INTVAL regno;
GET_ATTR_lexinfo(INTERP, SELF, info);
GET_ATTR_ctx(INTERP, SELF, ctx);
hash = (Hash *)VTABLE_get_pointer(INTERP, info);
b = parrot_hash_get_bucket(INTERP, hash, name);
if (!b)
Parrot_ex_throw_from_c_args(interp, NULL, EXCEPTION_LEX_NOT_FOUND,
"Lexical '%Ss' not found", name);
regno = (INTVAL) b->value;
CTX_REG_PMC(ctx, regno) = value;
}
VTABLE void set_pmc_keyed(PMC *name, PMC *value) {
STRING * const s = VTABLE_get_string(INTERP, name);
SELF.set_pmc_keyed_str(s, value);
}
METHOD get_lexinfo() {
PMC *lexinfo;
GET_ATTR_lexinfo(INTERP, SELF, lexinfo);
RETURN(PMC *lexinfo);
}
/*
=item C<PMC *get_iter()>
Get iterator for declared lexicals.
=cut
*/
VTABLE PMC *get_iter() {
PMC *lexinfo;
GET_ATTR_lexinfo(INTERP, SELF, lexinfo);
return VTABLE_get_iter(INTERP, lexinfo);
}
}
/*
=back
=head1 SEE ALSO
F<docs/pdds/pdd20_lexical_vars.pod>, F<src/pmc/lexinfo.pmc>.
=cut
*/
/*
* Local variables:
* c-file-style: "parrot"
* End:
* vim: expandtab shiftwidth=4:
*/