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// Copyright 2021 Benjamin Barenblat
//
// Licensed under the Apache License, Version 2.0 (the "License"); you may not
// use this file except in compliance with the License. You may obtain a copy of
// the License at
//
// https://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
// WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
// License for the specific language governing permissions and limitations under
// the License.
#include "src/builtin.h"
#include <math.h>
#include <functional>
#include <memory>
#include <string>
#include "src/language.h"
#include "third_party/abseil/absl/container/flat_hash_map.h"
#include "third_party/abseil/absl/memory/memory.h"
#include "third_party/abseil/absl/strings/string_view.h"
namespace ec {
namespace {
// Requires the compiler to select the double-valued overload of its argument.
double (*DoubleOverload(double (*f)(double)) noexcept)(double) { return f; }
double (*DoubleOverload(double (*f)(double, double)) noexcept)(double, double) {
return f;
}
// Pops the top of the stack and returns it as a GroundTerm; throws TypeError if
// it's not.
std::shared_ptr<const GroundTerm> PopGroundTerm(absl::string_view op,
State& s) {
if (s.stack.empty()) {
throw StackUnderflow(op);
}
auto ground = std::dynamic_pointer_cast<const GroundTerm>(s.stack.back());
if (ground == nullptr) {
throw TypeError(
absl::StrCat("expected number; got ", s.stack.back()->Show()));
}
s.stack.pop_back();
return ground;
}
// Executes a unary operation on the top of the stack.
void Unop(absl::string_view op, std::function<double(double)> f, State& s) {
if (s.stack.empty()) {
throw StackUnderflow(op);
}
s.stack.push_back(GroundTerm::Make(f(PopGroundTerm(op, s)->value())));
}
// Executes a binary operation on the top of the stack.
void Binop(absl::string_view op, std::function<double(double, double)> f,
State& s) {
if (s.stack.size() < 2) {
throw StackUnderflow(op);
}
std::shared_ptr<const GroundTerm> right, left;
right = PopGroundTerm(op, s);
left = PopGroundTerm(op, s);
s.stack.push_back(GroundTerm::Make(f(left->value(), right->value())));
}
} // namespace
absl::flat_hash_map<std::string, std::shared_ptr<const Term>>
BuiltinEnvironment() noexcept {
return {
{"dup", ForeignProgramTerm::Make(BuiltinDup)}, //
{"drop", ForeignProgramTerm::Make(BuiltinDrop)}, //
{"swap", ForeignProgramTerm::Make(BuiltinSwap)},
{"pi", GroundTerm::Make(M_PI)}, //
{"e", GroundTerm::Make(M_E)},
{"neg", ForeignProgramTerm::Make(BuiltinNeg)}, //
{"inv", ForeignProgramTerm::Make(BuiltinInv)}, //
{"sq", ForeignProgramTerm::Make(BuiltinSq)}, //
{"sqrt", ForeignProgramTerm::Make(BuiltinSqrt)}, //
{"alog", ForeignProgramTerm::Make(BuiltinAlog)}, //
{"log", ForeignProgramTerm::Make(BuiltinLog)}, //
{"exp", ForeignProgramTerm::Make(BuiltinExp)}, //
{"ln", ForeignProgramTerm::Make(BuiltinLn)}, //
{"sin", ForeignProgramTerm::Make(BuiltinSin)}, //
{"cos", ForeignProgramTerm::Make(BuiltinCos)}, //
{"tan", ForeignProgramTerm::Make(BuiltinTan)}, //
{"asin", ForeignProgramTerm::Make(BuiltinAsin)}, //
{"acos", ForeignProgramTerm::Make(BuiltinAcos)}, //
{"atan", ForeignProgramTerm::Make(BuiltinAtan)}, //
{"abs", ForeignProgramTerm::Make(BuiltinAbs)},
{"add", ForeignProgramTerm::Make(BuiltinAdd)}, //
{"sub", ForeignProgramTerm::Make(BuiltinSub)}, //
{"mul", ForeignProgramTerm::Make(BuiltinMul)}, //
{"div", ForeignProgramTerm::Make(BuiltinDiv)}, //
{"pow", ForeignProgramTerm::Make(BuiltinPow)}, //
{"xroot", ForeignProgramTerm::Make(BuiltinXroot)},
};
}
void BuiltinDup(State& s) {
if (s.stack.empty()) {
throw StackUnderflow("dup");
}
s.stack.push_back(s.stack.back()->Clone());
}
void BuiltinDrop(State& s) {
if (s.stack.empty()) {
throw StackUnderflow("drop");
}
s.stack.pop_back();
}
void BuiltinSwap(State& s) {
if (s.stack.size() < 2) {
throw StackUnderflow("swap");
}
std::shared_ptr<const Term> x, y;
x = s.stack.back();
s.stack.pop_back();
y = s.stack.back();
s.stack.pop_back();
s.stack.insert(s.stack.end(), {x, y});
}
void BuiltinNeg(State& s) { Unop("neg", std::negate<double>(), s); }
void BuiltinInv(State& s) {
Unop(
"inv", [](double d) { return 1 / d; }, s);
}
void BuiltinSq(State& s) {
Unop(
"sq", [](double d) { return d * d; }, s);
}
void BuiltinSqrt(State& s) { Unop("sqrt", DoubleOverload(sqrt), s); }
void BuiltinAlog(State& s) {
Unop(
"alog", [](double d) { return pow(10, d); }, s);
}
void BuiltinLog(State& s) { Unop("log", DoubleOverload(log10), s); }
void BuiltinExp(State& s) { Unop("exp", DoubleOverload(exp), s); }
void BuiltinLn(State& s) { Unop("ln", DoubleOverload(log), s); }
void BuiltinSin(State& s) { Unop("sin", DoubleOverload(sin), s); }
void BuiltinCos(State& s) { Unop("cos", DoubleOverload(cos), s); }
void BuiltinTan(State& s) { Unop("tan", DoubleOverload(tan), s); }
void BuiltinAsin(State& s) { Unop("asin", DoubleOverload(asin), s); }
void BuiltinAcos(State& s) { Unop("acos", DoubleOverload(acos), s); }
void BuiltinAtan(State& s) { Unop("atan", DoubleOverload(atan), s); }
void BuiltinAbs(State& s) { Unop("abs", DoubleOverload(fabs), s); }
void BuiltinAdd(State& s) { Binop("add", std::plus<double>(), s); }
void BuiltinSub(State& s) { Binop("sub", std::minus<double>(), s); }
void BuiltinMul(State& s) { Binop("mul", std::multiplies<double>(), s); }
void BuiltinDiv(State& s) { Binop("div", std::divides<double>(), s); }
void BuiltinPow(State& s) { Binop("div", DoubleOverload(pow), s); }
void BuiltinXroot(State& s) {
Binop(
"xroot", [](double y, double x) { return pow(y, 1 / x); }, s);
}
} // namespace ec
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