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SelectorValue.cpp
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SelectorValue.cpp
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/*
*
* Licensed to the Apache Software Foundation (ASF) under one
* or more contributor license agreements. See the NOTICE file
* distributed with this work for additional information
* regarding copyright ownership. The ASF licenses this file
* to you 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
*
* http://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 "SelectorValue.h"
#include <cassert>
#include <cstdint>
#include <ostream>
#include <variant>
using std::boolalpha;
using std::get;
using std::ostream;
using std::string_view;
// Define overload until C++26!
template <class ...Fs>
struct overload : Fs... {
template <class ...Ts>
overload(Ts&& ...ts) : Fs{std::forward<Ts>(ts)}...
{}
using Fs::operator()...;
};
template <class ...Ts>
overload(Ts&&...) -> overload<std::remove_reference_t<Ts>...>;
namespace selector {
ostream& operator<<(ostream& os, const Value& v)
{
std::visit(overload(
[&](std::monostate) { os << "UNKNOWN"; },
[&](bool b) {os << "BOOL:" << boolalpha << b; },
[&](int64_t i) { os << "EXACT:" << i; },
[&](double d) { os << "APPROX:" << d; },
[&](string_view sv) { os << "STRING:'" << sv << "'"; }
), v.value);
return os;
}
inline bool promoteNumeric(Value& v1, Value& v2)
{
if (!numeric(v1) || !numeric(v2)) return false;
if (sameType(v1,v2)) return true;
switch (v1.type()) {
case Value::T_INEXACT: v2 = double(get<int64_t>(v2.value)); return true;
case Value::T_EXACT: v1 = double(get<int64_t>(v1.value)); return true;
default: assert(false);
}
}
bool operator==(Value v1, Value v2)
{
promoteNumeric(v1, v2);
if (!sameType(v1,v2)) return false;
return v1.value == v2.value;
}
bool operator!=(Value v1, Value v2)
{
promoteNumeric(v1, v2);
if (!sameType(v1,v2)) return false;
return v1.value != v2.value;
}
bool operator<(Value v1, Value v2)
{
if (!promoteNumeric(v1, v2)) return false;
switch (v1.type()) {
case Value::T_EXACT:
case Value::T_INEXACT:
return v1.value < v2.value;
default:
assert(false);
}
}
bool operator>(Value v1, Value v2)
{
if (!promoteNumeric(v1, v2)) return false;
switch (v1.type()) {
case Value::T_EXACT:
case Value::T_INEXACT:
return v1.value > v2.value;
default:
assert(false);
}
}
bool operator<=(Value v1, Value v2)
{
if (!promoteNumeric(v1, v2)) return false;
switch (v1.type()) {
case Value::T_EXACT:
case Value::T_INEXACT:
return v1.value <= v2.value;
default:
assert(false);
}
}
bool operator>=(Value v1, Value v2)
{
if (!promoteNumeric(v1, v2)) return false;
switch (v1.type()) {
case Value::T_EXACT:
case Value::T_INEXACT:
return v1.value >= v2.value;
default:
assert(false);
}
}
BoolOrNone operator!(const Value& v)
{
switch (v.type()) {
case Value::T_BOOL:
return BoolOrNone(!get<bool>(v.value));
default:
break;
}
return BN_UNKNOWN;
}
Value operator+(Value v1, Value v2)
{
if (!promoteNumeric(v1, v2)) return Value{};
switch (v1.type()) {
case Value::T_EXACT:
return get<int64_t>(v1.value) + get<int64_t>(v2.value);
case Value::T_INEXACT:
return get<double>(v1.value) + get<double>(v2.value);
default:
assert(false);
}
}
Value operator-(Value v1, Value v2)
{
if (!promoteNumeric(v1, v2)) return Value{};
switch (v1.type()) {
case Value::T_EXACT:
return get<int64_t>(v1.value) - get<int64_t>(v2.value);
case Value::T_INEXACT:
return get<double>(v1.value) - get<double>(v2.value);
default:
assert(false);
}
}
Value operator*(Value v1, Value v2)
{
if (!promoteNumeric(v1, v2)) return Value{};
switch (v1.type()) {
case Value::T_EXACT:
return get<int64_t>(v1.value) * get<int64_t>(v2.value);
case Value::T_INEXACT:
return get<double>(v1.value) * get<double>(v2.value);
default:
assert(false);
}
}
Value operator/(Value v1, Value v2)
{
if (!promoteNumeric(v1, v2)) return Value{};
switch (v1.type()) {
case Value::T_EXACT: {
int64_t divisor = get<int64_t>(v2.value);
if (divisor==0) {
return get<int64_t>(v1.value) / double(divisor);
}
return get<int64_t>(v1.value) / divisor;
}
case Value::T_INEXACT:
return get<double>(v1.value) / get<double>(v2.value);
default:
assert(false);
}
}
Value operator-(const Value& v)
{
switch (v.type()) {
case Value::T_EXACT:
return -get<int64_t>(v.value);
case Value::T_INEXACT:
return -get<double>(v.value);
default:
break;
}
return Value();
}
}