PorygonLang/src/Evaluator/BinaryEvaluation.cpp

#include "../Script.hpp"
#include "EvaluationException.hpp"
#include "Evaluator.hpp"
#include "EvalValues/NumericEvalValue.hpp"
#include "EvalValues/StringEvalValue.hpp"

shared_ptr<NumericEvalValue> Evaluator::EvaluateIntegerBinary(BoundBinaryExpression *expression) {
    auto leftValue = this -> EvaluateIntegerExpression(expression->GetLeft());
    auto rightValue = this -> EvaluateIntegerExpression(expression->GetRight());

    NumericEvalValue* result;
    switch (expression->GetOperation()){
        case BoundBinaryOperation ::Addition:
            result = leftValue.get() -> operator+ (rightValue.get());
            break;
        case BoundBinaryOperation::Subtraction:
            result = leftValue.get() -> operator- (rightValue.get());
            break;
        case BoundBinaryOperation::Multiplication:
            result = leftValue.get() -> operator* (rightValue.get());
            break;
        case BoundBinaryOperation::Division:
            result = leftValue.get() -> operator/ (rightValue.get());
            break;
        default:
            throw EvaluationException("Can't evaluate operation to numeric");
    }
    return shared_ptr<NumericEvalValue>(result);
}

shared_ptr<BooleanEvalValue> Evaluator::EvaluateBooleanBinary(BoundBinaryExpression* expression){
    switch (expression->GetOperation()){
        case BoundBinaryOperation::Equality:
        {
            auto leftValue = this -> EvaluateExpression(expression->GetLeft());
            auto rightValue = this -> EvaluateExpression(expression->GetRight());
            bool equals = leftValue.get()->operator==(rightValue.get());
            return make_shared<BooleanEvalValue>(equals);
        }
        case BoundBinaryOperation::Inequality:
        {
            auto leftValue = this -> EvaluateExpression(expression->GetLeft());
            auto rightValue = this -> EvaluateExpression(expression->GetRight());
            bool equals = leftValue.get()->operator!=(rightValue.get());
            return make_shared<BooleanEvalValue>(equals);
        }
        case BoundBinaryOperation::LogicalAnd:
        {
            auto leftValue = this -> EvaluateBoolExpression(expression->GetLeft());
            if (!leftValue->EvaluateBool()) return leftValue;
            auto rightValue = this -> EvaluateBoolExpression(expression->GetRight());
            return rightValue;
        }
        case BoundBinaryOperation::LogicalOr:
        {
            auto leftValue = this -> EvaluateBoolExpression(expression->GetLeft());
            if (leftValue->EvaluateBool()) return leftValue;
            auto rightValue = this -> EvaluateBoolExpression(expression->GetRight());
            return rightValue;
        }
        default:
            throw EvaluationException("Can't evaluate operation to boolean");
    }
}

shared_ptr<StringEvalValue> Evaluator::EvaluateStringBinary(BoundBinaryExpression* expression){
    if (expression->GetOperation() != BoundBinaryOperation::Concatenation)
        throw;
    std::ostringstream strs;
    auto left = this -> EvaluateStringExpression(expression->GetLeft());
    strs << *left->EvaluateString();
    auto right = this -> EvaluateExpression(expression->GetRight());
    strs << *right->EvaluateString();
    return make_shared<StringEvalValue>(strs.str());
}