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// Copyright (C) 2011-2022, Gabriel Dos Reis.
// All rights reserved.
// Written by Gabriel Dos Reis.
//
// Redistribution and use in source and binary forms, with or without
// modification, are permitted provided that the following conditions are
// met:
//
// - Redistributions of source code must retain the above copyright
// notice, this list of conditions and the following disclaimer.
//
// - Redistributions in binary form must reproduce the above copyright
// notice, this list of conditions and the following disclaimer in
// the documentation and/or other materials provided with the
// distribution.
//
// - Neither the name of OpenAxiom nor the names of its contributors
// may be used to endorse or promote products derived from this
// software without specific prior written permission.
//
// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS
// IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
// TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A
// PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER
// OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
// EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
// PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
// PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
// LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
// NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
// SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
// --% Author: Gabriel Dos Reis
#include <open-axiom/vm>
#include <iterator>
#include <algorithm>
#include <ostream>
namespace OpenAxiom {
namespace VM {
void Boxed::Visitor::visit(const NullaryOperator& x) {
visit(as<FunctionBase>(x));
}
void Boxed::Visitor::visit(const UnaryOperator& x) {
visit(as<FunctionBase>(x));
}
void Boxed::Visitor::visit(const BinaryOperator& x) {
visit(as<FunctionBase>(x));
}
void FunctionBase::accept(Visitor& v) const { v.visit(*this); }
// -- Environement
Environment::Environment() = default;
Environment::~Environment() {
// Restore value of special variables bound in this environment.
const auto end = dynamic.rend();
for (auto p = dynamic.rbegin(); p != end; ++p)
p->symbol->value = p->value;
}
Environment::Binding*
Environment::lookup(InternedString name) {
for (auto& b : lexical) {
if (b.symbol->name == name)
return &b;
}
return nullptr;
}
// -- Symbol
Symbol::Symbol(InternedString s)
: name(s),
value(),
function(),
properties(),
package(),
attributes()
{ }
void Symbol::accept(Visitor& v) const { v.visit(*this); }
// -- Binding
void Binding::accept(Visitor& v) const { v.visit(*this); }
// -- Package
Package::Package(InternedString s)
: name(s)
{ }
Symbol*
Package::make_symbol(InternedString s) {
auto sym = const_cast<Symbol*>(&*symbols.insert(Symbol(s)).first);
sym->package = this;
return sym;
}
Symbol*
Package::find_symbol(InternedString s) {
auto p = symbols.find(Symbol(s));
return p == symbols.end() ? nullptr : const_cast<Symbol*>(&*p);
}
void Package::accept(Visitor& v) const { v.visit(*this); }
Fixnum
count_nodes(Pair p) {
FixnumBits n = 1;
for (; auto q = if_pair(p->tail); p = q)
++n;
return Fixnum(n);
}
// -- BasicContext --
Package*
BasicContext::make_package(InternedString n) {
auto p = &*packages.insert(Package(n)).first;
return const_cast<Package*>(p);
}
Symbol*
BasicContext::make_keyword(InternedString n) {
auto sym = keyword_package()->make_symbol(n);
sym->value = to_value(sym);
sym->attributes = SymbolAttribute::Keyword;
return sym;
}
Pair BasicContext::make_pair(Value h, Value t) {
return conses.make(h, t);
}
const NullaryOperator*
BasicContext::make_operator(Symbol* n, NullaryCode c) {
return setf_symbol_function(n, nullaries.make(n, c));
}
const UnaryOperator*
BasicContext::make_operator(Symbol* n, UnaryCode c) {
return setf_symbol_function(n, unaries.make(n, c));
}
const BinaryOperator*
BasicContext::make_operator(Symbol* n, BinaryCode c) {
return setf_symbol_function(n, binaries.make(n, c));
}
const TernaryOperator*
BasicContext::make_operator(Symbol* n, TernaryCode c) {
return setf_symbol_function(n, ternaries.make(n, c));
}
BasicContext::BasicContext()
: keywords(make_package(intern("KEYWORD"))),
homeless(make_package(nullptr))
{
}
BasicContext::~BasicContext() {
}
}
}
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