/
PseudoStash.pm
260 lines (250 loc) · 10.3 KB
/
PseudoStash.pm
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my class X::Bind { ... }
my class X::Caller::NotDynamic { ... }
my class PseudoStash is Map {
has Mu $!ctx;
has int $!mode;
# Lookup modes.
my int constant PICK_CHAIN_BY_NAME = 0;
my int constant STATIC_CHAIN = 1;
my int constant DYNAMIC_CHAIN = 2;
my int constant PRECISE_SCOPE = 4;
my int constant REQUIRE_DYNAMIC = 8;
method new() {
my $obj := nqp::create(self);
my $ctx := nqp::ctxcaller(nqp::ctx());
nqp::bindattr($obj, PseudoStash, '$!ctx', $ctx);
nqp::bindattr($obj, Map, '$!storage', nqp::ctxlexpad($ctx));
$obj
}
my %pseudoers =
'MY' => sub ($cur) {
my $stash := nqp::clone($cur);
nqp::bindattr_i($stash, PseudoStash, '$!mode', PRECISE_SCOPE);
nqp::setwho(
Metamodel::ModuleHOW.new_type(:name('MY')),
$stash);
},
'CORE' => sub ($cur) {
my Mu $ctx := nqp::getattr(nqp::decont($cur), PseudoStash, '$!ctx');
until nqp::existskey(nqp::ctxlexpad($ctx), '!CORE_MARKER') {
$ctx := nqp::ctxouterskipthunks($ctx);
}
my $stash := nqp::create(PseudoStash);
nqp::bindattr($stash, Map, '$!storage', nqp::ctxlexpad($ctx));
nqp::bindattr($stash, PseudoStash, '$!ctx', $ctx);
nqp::bindattr_i($stash, PseudoStash, '$!mode', PRECISE_SCOPE);
nqp::setwho(
Metamodel::ModuleHOW.new_type(:name('CORE')),
$stash);
},
'CALLER' => sub ($cur) {
my Mu $ctx := nqp::ctxcallerskipthunks(
nqp::getattr(nqp::decont($cur), PseudoStash, '$!ctx'));
my $stash := nqp::create(PseudoStash);
nqp::bindattr($stash, Map, '$!storage', nqp::ctxlexpad($ctx));
nqp::bindattr($stash, PseudoStash, '$!ctx', $ctx);
nqp::bindattr_i($stash, PseudoStash, '$!mode', PRECISE_SCOPE +| REQUIRE_DYNAMIC);
nqp::setwho(
Metamodel::ModuleHOW.new_type(:name('CALLER')),
$stash);
},
'OUTER' => sub ($cur) {
my Mu $ctx := nqp::ctxouterskipthunks(
nqp::getattr(nqp::decont($cur),PseudoStash,'$!ctx'));
if nqp::isnull($ctx) {
Nil
}
else {
my $stash := nqp::create(PseudoStash);
nqp::bindattr($stash, Map, '$!storage', nqp::ctxlexpad($ctx));
nqp::bindattr($stash, PseudoStash, '$!ctx', $ctx);
nqp::bindattr_i($stash, PseudoStash, '$!mode', PRECISE_SCOPE);
nqp::setwho(
Metamodel::ModuleHOW.new_type(:name('OUTER')),
$stash)
}
},
'LEXICAL' => sub ($cur) {
my $stash := nqp::clone($cur);
nqp::bindattr_i($stash, PseudoStash, '$!mode', STATIC_CHAIN);
nqp::setwho(
Metamodel::ModuleHOW.new_type(:name('LEXICAL')),
$stash);
},
'OUTERS' => sub ($cur) {
my Mu $ctx := nqp::ctxouterskipthunks(
nqp::getattr(nqp::decont($cur), PseudoStash, '$!ctx'));
if nqp::isnull($ctx) {
Nil
}
else {
my $stash := nqp::create(PseudoStash);
nqp::bindattr($stash, Map, '$!storage', nqp::ctxlexpad($ctx));
nqp::bindattr($stash, PseudoStash, '$!ctx', $ctx);
nqp::bindattr_i($stash, PseudoStash, '$!mode', STATIC_CHAIN);
nqp::setwho(
Metamodel::ModuleHOW.new_type(:name('OUTERS')),
$stash)
}
},
'DYNAMIC' => sub ($cur) {
my $stash := nqp::clone($cur);
nqp::bindattr_i($stash, PseudoStash, '$!mode', DYNAMIC_CHAIN);
nqp::setwho(
Metamodel::ModuleHOW.new_type(:name('DYNAMIC')),
$stash);
},
'CALLERS' => sub ($cur) {
my Mu $ctx := nqp::ctxcallerskipthunks(
nqp::getattr(nqp::decont($cur), PseudoStash, '$!ctx'));
my $stash := nqp::create(PseudoStash);
nqp::bindattr($stash, Map, '$!storage', nqp::ctxlexpad($ctx));
nqp::bindattr($stash, PseudoStash, '$!ctx', $ctx);
nqp::bindattr_i($stash, PseudoStash, '$!mode', DYNAMIC_CHAIN +| REQUIRE_DYNAMIC);
nqp::setwho(
Metamodel::ModuleHOW.new_type(:name('CALLERS')),
$stash);
},
'UNIT' => sub ($cur) {
my Mu $ctx := nqp::getattr(nqp::decont($cur), PseudoStash, '$!ctx');
until nqp::existskey(nqp::ctxlexpad($ctx), '!UNIT_MARKER') {
$ctx := nqp::ctxouterskipthunks($ctx);
}
my $stash := nqp::create(PseudoStash);
nqp::bindattr($stash, Map, '$!storage',nqp::ctxlexpad($ctx));
nqp::bindattr($stash, PseudoStash, '$!ctx', $ctx);
nqp::bindattr_i($stash, PseudoStash, '$!mode', PRECISE_SCOPE);
nqp::setwho(
Metamodel::ModuleHOW.new_type(:name('UNIT')),
$stash);
},
'SETTING' => sub ($cur) {
# Same as UNIT, but go a little further out (two steps, for
# internals reasons).
my Mu $ctx := nqp::getattr(nqp::decont($cur), PseudoStash, '$!ctx');
until nqp::existskey(nqp::ctxlexpad($ctx), '!UNIT_MARKER') {
$ctx := nqp::ctxouterskipthunks($ctx);
}
$ctx := nqp::ctxouter(nqp::ctxouter($ctx));
my $stash := nqp::create(PseudoStash);
nqp::bindattr($stash, Map, '$!storage', nqp::ctxlexpad($ctx));
nqp::bindattr($stash, PseudoStash, '$!ctx', $ctx);
nqp::bindattr_i($stash, PseudoStash, '$!mode', STATIC_CHAIN);
nqp::setwho(
Metamodel::ModuleHOW.new_type(:name('SETTING')),
$stash);
},
'CLIENT' => sub ($cur) {
my $pkg := nqp::getlexrel(
nqp::getattr(nqp::decont($cur), PseudoStash, '$!ctx'),
'$?PACKAGE');
die "GLOBAL can have no client package" if $pkg.^name eq "GLOBAL";
my Mu $ctx := nqp::ctxcallerskipthunks(
nqp::getattr(nqp::decont($cur), PseudoStash, '$!ctx'));
while nqp::getlexrel($ctx, '$?PACKAGE') === $pkg {
$ctx := nqp::ctxcallerskipthunks($ctx);
die "No client package found" unless $ctx;
}
my $stash := nqp::create(PseudoStash);
nqp::bindattr($stash, Map, '$!storage', nqp::ctxlexpad($ctx));
nqp::bindattr($stash, PseudoStash, '$!ctx', $ctx);
nqp::bindattr_i($stash, PseudoStash, '$!mode', PRECISE_SCOPE +| REQUIRE_DYNAMIC);
nqp::setwho(
Metamodel::ModuleHOW.new_type(:name('CLIENT')),
$stash);
},
'OUR' => sub ($cur) {
nqp::getlexrel(
nqp::getattr(nqp::decont($cur), PseudoStash, '$!ctx'),
'$?PACKAGE')
};
multi method AT-KEY(PseudoStash:D: Str() $key) is raw {
nqp::if(
%pseudoers.EXISTS-KEY($key),
%pseudoers.AT-KEY($key)(self),
nqp::if(
nqp::bitand_i($!mode,PRECISE_SCOPE),
nqp::stmts(
(my Mu $res := nqp::if(
nqp::existskey(
nqp::getattr(self,Map,'$!storage'),nqp::unbox_s($key)),
nqp::atkey(
nqp::getattr(self,Map,'$!storage'),nqp::unbox_s($key)),
Nil
)),
nqp::if(
(nqp::not_i(nqp::eqaddr($res,Nil))
&& nqp::bitand_i($!mode,REQUIRE_DYNAMIC)),
nqp::if(
(try nqp::not_i($res.VAR.dynamic)),
X::Caller::NotDynamic.new(symbol => $key).throw
)
),
$res
),
nqp::if(
nqp::bitand_i(
$!mode,nqp::bitor_i(DYNAMIC_CHAIN,PICK_CHAIN_BY_NAME)
) && nqp::iseq_i(nqp::ord(nqp::unbox_s($key),1),42), # "*"
nqp::ifnull(
nqp::getlexreldyn(
nqp::getattr(self,PseudoStash,'$!ctx'),nqp::unbox_s($key)),
Nil
),
nqp::ifnull( # STATIC_CHAIN
nqp::getlexrel(
nqp::getattr(self,PseudoStash,'$!ctx'),nqp::unbox_s($key)),
Nil
)
)
)
)
}
method BIND-KEY(Str() $key, \value) is raw {
nqp::if(
%pseudoers.EXISTS-KEY($key),
X::Bind.new(target => "pseudo-package $key").throw,
nqp::if(
nqp::bitand_i($!mode,PRECISE_SCOPE),
nqp::bindkey(
nqp::getattr(self,Map,'$!storage'),nqp::unbox_s($key),value),
nqp::if(
nqp::bitand_i(
$!mode,nqp::bitor_i(DYNAMIC_CHAIN,PICK_CHAIN_BY_NAME)
) && nqp::iseq_i(nqp::ord(nqp::unbox_s($key),1),42), # "*"
(die "Binding to dynamic variables not yet implemented"),
(die "This case of binding is not yet implemented") # STATIC_CHAIN
)
)
)
}
# for some reason we get a ambiguous dispatch error by making this a multi
method EXISTS-KEY(PseudoStash:D: Str() $key) {
nqp::unless(
%pseudoers.EXISTS-KEY($key),
nqp::p6bool(
nqp::if(
nqp::bitand_i($!mode,PRECISE_SCOPE),
nqp::existskey(
nqp::getattr(self,Map,'$!storage'),nqp::unbox_s($key)),
nqp::if(
nqp::bitand_i(
$!mode,nqp::bitor_i(DYNAMIC_CHAIN,PICK_CHAIN_BY_NAME)
) && nqp::iseq_i(nqp::ord(nqp::unbox_s($key),1),42), # "*"
nqp::not_i(
nqp::isnull(
nqp::getlexreldyn(
nqp::getattr(self, PseudoStash, '$!ctx'),
nqp::unbox_s($key)))),
nqp::not_i( # STATIC_CHAIN
nqp::isnull(
nqp::getlexrel(
nqp::getattr(self, PseudoStash, '$!ctx'),
nqp::unbox_s($key))))
)
)
)
)
}
}
# vim: ft=perl6 expandtab sw=4