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#include "ASTInterpreter.h"
#include "Expression.h"
#include <cassert>
#include <iostream>
ASTInterpreter::ASTInterpreter()
{}
ASTInterpreter::~ASTInterpreter()
{}
ASTInterpreter::ValueStack ASTInterpreter::Run(Expression* program)
{
program->Accept(*this);
ValueStack result;
m_Evaluation.swap(result);
return result;
}
void ASTInterpreter::RunExpression(const ExpressionPtr& e)
{
if (e) {
e->Accept(*this);
}
}
bool ASTInterpreter::EvalToBool(const ExpressionPtr& e)
{
e->Accept(*this);
auto result = m_Evaluation.top();
m_Evaluation.pop();
return result != 0.0;
}
#define NOT_IMPLEMENTED (void)e; assert(0 && "not-implemented")
void ASTInterpreter::Visit(LiteralNull* e) {
NOT_IMPLEMENTED;
}
void ASTInterpreter::Visit(LiteralUndefined* e) {
NOT_IMPLEMENTED;
}
void ASTInterpreter::Visit(LiteralString* e) {
NOT_IMPLEMENTED;
}
void ASTInterpreter::Visit(LiteralNumber* e) {
m_Evaluation.push(e->GetValue());
}
void ASTInterpreter::Visit(LiteralBoolean* e) {
m_Evaluation.push(e->GetValue());
}
void ASTInterpreter::Visit(BinaryExpression* e) {
e->GetLeft()->Accept(*this);
e->GetRight()->Accept(*this);
auto right = m_Evaluation.top();
m_Evaluation.pop();
auto left = m_Evaluation.top();
m_Evaluation.pop();
switch (e->GetOperator()) {
case TokenType::Plus:
std::cout << "PLUS:" << left << ':' << right << std::endl;
m_Evaluation.push(left + right);
break;
case TokenType::Minus:
m_Evaluation.push(left - right);
break;
case TokenType::Star:
m_Evaluation.push(left * right);
break;
case TokenType::Division:
m_Evaluation.push(left / right);
break;
default:
NOT_IMPLEMENTED;
}
}
void ASTInterpreter::Visit(UnaryExpression* e) {
NOT_IMPLEMENTED;
}
void ASTInterpreter::Visit(IdentifierExpression* e) {
auto values = m_Variables.find(e->GetName());
if (values != m_Variables.end()) {
m_Evaluation.push(values->second.top());
} else {
throw "Not-defined";
}
}
void ASTInterpreter::Visit(ListExpression* e) {
for (const auto& stmt: e->GetValues()) {
stmt->Accept(*this);
}
}
void ASTInterpreter::Visit(VariableDefinitionExpression* e) {
e->GetValue()->Accept(*this);
m_Variables[e->GetName()].push(m_Evaluation.top());
m_Evaluation.pop();
}
void ASTInterpreter::Visit(BlockStatement* e) {
for (const auto& stmt: e->GetValues()) {
stmt->Accept(*this);
}
}
void ASTInterpreter::Visit(LabeledStatement* e) {
RunExpression(e->GetStatement());
}
void ASTInterpreter::Visit(IfStatement* e) {
if (EvalToBool(e->GetCondition())) {
RunExpression(e->GetIfStatement());
} else {
RunExpression(e->GetElseStatement());
}
}
void ASTInterpreter::Visit(SwitchStatement* e) { NOT_IMPLEMENTED;}
void ASTInterpreter::Visit(CaseStatement *e) { NOT_IMPLEMENTED;}
void ASTInterpreter::Visit(WhileStatement* e) {
if (e->GetDoWhile()) {
RunExpression(e->GetBody());
}
while (EvalToBool(e->GetCondition())) {
RunExpression(e->GetBody());
}
}
void ASTInterpreter::Visit(ForStatement* e) {
for (RunExpression(e->GetInitialization());
EvalToBool(e->GetCondition());
RunExpression(e->GetIteration())) {
RunExpression(e->GetBody());
}
}
void ASTInterpreter::Visit(FunctionDeclaration* e) { NOT_IMPLEMENTED;}
void ASTInterpreter::Visit(TopStatements* e) {
for (const auto& stmt: e->GetValues()) {
stmt->Accept(*this);
}
}
void ASTInterpreter::Visit(EmptyExpression* e) {
NOT_IMPLEMENTED;
}
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