Bobby Lucero
72a31b28af
- Add none value handling to Value::operator+ for string concatenation - Replace direct string concatenations with Value::operator+ calls in Interpreter - Add missing string+none and none+string type combinations - Standardize token literal generation in Lexer - Add ExecutionContext support across visitor pattern - Enhance error reporting integration - Add new standard library functions
879 lines
28 KiB
C++
879 lines
28 KiB
C++
//
|
|
// Created by Bobby Lucero on 5/27/23.
|
|
//
|
|
#include <utility>
|
|
#include <sstream>
|
|
#include <cmath>
|
|
#include <iomanip>
|
|
#include <limits>
|
|
#include <cmath>
|
|
#include "../headers/Interpreter.h"
|
|
#include "../headers/helperFunctions/HelperFunctions.h"
|
|
#include <unordered_map>
|
|
#include "../headers/Interpreter.h"
|
|
#include "../headers/StdLib.h"
|
|
#include <iostream>
|
|
#include <chrono>
|
|
#include <cmath>
|
|
#include <stdexcept>
|
|
#include <algorithm>
|
|
|
|
struct ReturnContext {
|
|
Value returnValue;
|
|
bool hasReturn;
|
|
ReturnContext() : returnValue(NONE_VALUE), hasReturn(false) {}
|
|
};
|
|
|
|
|
|
Value Interpreter::visitLiteralExpr(const std::shared_ptr<LiteralExpr>& expr) {
|
|
if(expr->isNull) return NONE_VALUE;
|
|
if(expr->isNumber){
|
|
double num;
|
|
if(expr->value[1] == 'b')
|
|
{
|
|
num = binaryStringToLong(expr->value);
|
|
}
|
|
else
|
|
{
|
|
num = std::stod(expr->value);
|
|
}
|
|
return Value(num);
|
|
}
|
|
if(expr->isBoolean) {
|
|
if(expr->value == "true") return TRUE_VALUE;
|
|
if(expr->value == "false") return FALSE_VALUE;
|
|
}
|
|
return Value(expr->value);
|
|
}
|
|
|
|
Value Interpreter::visitGroupingExpr(const std::shared_ptr<GroupingExpr>& expression) {
|
|
|
|
return evaluate(expression->expression);
|
|
}
|
|
|
|
Value Interpreter::visitUnaryExpr(const std::shared_ptr<UnaryExpr>& expression)
|
|
{
|
|
Value right = evaluate(expression->right);
|
|
|
|
if(expression->oper.type == MINUS)
|
|
{
|
|
if(right.isNumber())
|
|
{
|
|
double value = right.asNumber();
|
|
return Value(-value);
|
|
}
|
|
else
|
|
{
|
|
throw std::runtime_error("Operand must be a number when using: " + expression->oper.lexeme);
|
|
}
|
|
|
|
}
|
|
|
|
if(expression->oper.type == BANG)
|
|
{
|
|
return Value(!isTruthy(right));
|
|
}
|
|
|
|
if(expression->oper.type == BIN_NOT)
|
|
{
|
|
if(right.isNumber())
|
|
{
|
|
double value = right.asNumber();
|
|
return Value(static_cast<double>(~(static_cast<long>(value))));
|
|
}
|
|
else
|
|
{
|
|
throw std::runtime_error("Operand must be an int when using: " + expression->oper.lexeme);
|
|
}
|
|
}
|
|
|
|
//unreachable
|
|
throw std::runtime_error("Invalid unary expression");
|
|
|
|
}
|
|
|
|
Value Interpreter::visitBinaryExpr(const std::shared_ptr<BinaryExpr>& expression) {
|
|
Value left = evaluate(expression->left);
|
|
Value right = evaluate(expression->right);
|
|
|
|
if (left.isNumber() && right.isNumber()) {
|
|
double leftNum = left.asNumber();
|
|
double rightNum = right.asNumber();
|
|
|
|
switch (expression->oper.type) {
|
|
case PLUS: return Value(leftNum + rightNum);
|
|
case MINUS: return Value(leftNum - rightNum);
|
|
case SLASH: {
|
|
if (rightNum == 0) {
|
|
if (errorReporter) {
|
|
errorReporter->reportError(expression->oper.line, expression->oper.column, "Division by Zero",
|
|
"Cannot divide by zero", expression->oper.lexeme);
|
|
}
|
|
throw std::runtime_error("Division by zero");
|
|
}
|
|
return Value(leftNum / rightNum);
|
|
}
|
|
case STAR: return Value(leftNum * rightNum);
|
|
case PERCENT: {
|
|
if (rightNum == 0) {
|
|
if (errorReporter) {
|
|
errorReporter->reportError(expression->oper.line, expression->oper.column, "Modulo by Zero",
|
|
"Cannot perform modulo operation with zero", expression->oper.lexeme);
|
|
}
|
|
throw std::runtime_error("Modulo by zero");
|
|
}
|
|
return Value(std::fmod(leftNum, rightNum));
|
|
}
|
|
case GREATER: return Value(leftNum > rightNum);
|
|
case GREATER_EQUAL: return Value(leftNum >= rightNum);
|
|
case LESS: return Value(leftNum < rightNum);
|
|
case LESS_EQUAL: return Value(leftNum <= rightNum);
|
|
case DOUBLE_EQUAL: return Value(leftNum == rightNum);
|
|
case BANG_EQUAL: return Value(leftNum != rightNum);
|
|
case BIN_AND: return Value(static_cast<double>(static_cast<int>(leftNum) & static_cast<int>(rightNum)));
|
|
case BIN_OR: return Value(static_cast<double>(static_cast<int>(leftNum) | static_cast<int>(rightNum)));
|
|
case BIN_XOR: return Value(static_cast<double>(static_cast<int>(leftNum) ^ static_cast<int>(rightNum)));
|
|
case BIN_SLEFT: return Value(static_cast<double>(static_cast<int>(leftNum) << static_cast<int>(rightNum)));
|
|
case BIN_SRIGHT: return Value(static_cast<double>(static_cast<int>(leftNum) >> static_cast<int>(rightNum)));
|
|
case AND: {
|
|
if (!isTruthy(left)) {
|
|
return left; // Return the falsy value
|
|
} else {
|
|
return right; // Return the second value
|
|
}
|
|
}
|
|
case OR: {
|
|
if (isTruthy(left)) {
|
|
return left; // Return the truthy value
|
|
} else {
|
|
return right; // Return the second value
|
|
}
|
|
}
|
|
}
|
|
}
|
|
|
|
if (left.isString() && right.isString()) {
|
|
std::string left_string = left.asString();
|
|
std::string right_string = right.asString();
|
|
|
|
switch (expression->oper.type) {
|
|
case PLUS: return Value(left_string + right_string);
|
|
case DOUBLE_EQUAL: return Value(left_string == right_string);
|
|
case BANG_EQUAL: return Value(left_string != right_string);
|
|
case AND: {
|
|
if (!isTruthy(left)) {
|
|
return left; // Return the falsy value
|
|
} else {
|
|
return right; // Return the second value
|
|
}
|
|
}
|
|
case OR: {
|
|
if (isTruthy(left)) {
|
|
return left; // Return the truthy value
|
|
} else {
|
|
return right; // Return the second value
|
|
}
|
|
}
|
|
default:
|
|
if (errorReporter) {
|
|
errorReporter->reportError(expression->oper.line, expression->oper.column, "Runtime Error",
|
|
"Cannot use '" + expression->oper.lexeme + "' on two strings", expression->oper.lexeme);
|
|
}
|
|
throw std::runtime_error("Cannot use '" + expression->oper.lexeme + "' on two strings");
|
|
}
|
|
}
|
|
|
|
if (left.isString() && right.isNumber()) {
|
|
std::string left_string = left.asString();
|
|
double right_num = right.asNumber();
|
|
|
|
switch (expression->oper.type) {
|
|
case PLUS: return left + right;
|
|
case STAR: {
|
|
if (!isWholeNumer(right_num)) {
|
|
if (errorReporter) {
|
|
errorReporter->reportError(expression->oper.line, expression->oper.column, "Invalid String Multiplication",
|
|
"String multiplier must be a whole number", expression->oper.lexeme);
|
|
}
|
|
throw std::runtime_error("String multiplier must be whole number");
|
|
}
|
|
std::string result;
|
|
for (int i = 0; i < static_cast<int>(right_num); i++) {
|
|
result += left_string;
|
|
}
|
|
return Value(result);
|
|
}
|
|
}
|
|
}
|
|
|
|
if (left.isNumber() && right.isString()) {
|
|
double left_num = left.asNumber();
|
|
std::string right_string = right.asString();
|
|
|
|
switch (expression->oper.type) {
|
|
case PLUS: return left + right;
|
|
case STAR: {
|
|
if (!isWholeNumer(left_num)) {
|
|
if (errorReporter) {
|
|
errorReporter->reportError(expression->oper.line, expression->oper.column, "Invalid String Multiplication",
|
|
"String multiplier must be a whole number", expression->oper.lexeme);
|
|
}
|
|
throw std::runtime_error("String multiplier must be whole number");
|
|
}
|
|
std::string result;
|
|
for (int i = 0; i < static_cast<int>(left_num); i++) {
|
|
result += right_string;
|
|
}
|
|
return Value(result);
|
|
}
|
|
}
|
|
}
|
|
|
|
if (left.isBoolean() && right.isBoolean()) {
|
|
bool left_bool = left.asBoolean();
|
|
bool right_bool = right.asBoolean();
|
|
|
|
switch (expression->oper.type) {
|
|
case AND: return Value(left_bool && right_bool);
|
|
case OR: return Value(left_bool || right_bool);
|
|
case DOUBLE_EQUAL: return Value(left_bool == right_bool);
|
|
case BANG_EQUAL: return Value(left_bool != right_bool);
|
|
}
|
|
}
|
|
|
|
|
|
|
|
if (left.isBoolean() && right.isString()) {
|
|
bool left_bool = left.asBoolean();
|
|
std::string right_string = right.asString();
|
|
|
|
switch (expression->oper.type) {
|
|
case PLUS: return left + right;
|
|
}
|
|
}
|
|
|
|
if (left.isString() && right.isBoolean()) {
|
|
std::string left_string = left.asString();
|
|
bool right_bool = right.asBoolean();
|
|
|
|
switch (expression->oper.type) {
|
|
case PLUS: return left + right;
|
|
}
|
|
}
|
|
|
|
if (left.isNumber() && right.isBoolean()) {
|
|
double left_num = left.asNumber();
|
|
bool right_bool = right.asBoolean();
|
|
|
|
switch (expression->oper.type) {
|
|
case AND: {
|
|
if (!isTruthy(left)) {
|
|
return left; // Return the falsy value
|
|
} else {
|
|
return right; // Return the second value
|
|
}
|
|
}
|
|
case OR: {
|
|
if (isTruthy(left)) {
|
|
return left; // Return the truthy value
|
|
} else {
|
|
return right; // Return the second value
|
|
}
|
|
}
|
|
}
|
|
}
|
|
|
|
if (left.isBoolean() && right.isNumber()) {
|
|
bool left_bool = left.asBoolean();
|
|
double right_num = right.asNumber();
|
|
|
|
switch (expression->oper.type) {
|
|
case AND: {
|
|
if (!isTruthy(left)) {
|
|
return left; // Return the falsy value
|
|
} else {
|
|
return right; // Return the second value
|
|
}
|
|
}
|
|
case OR: {
|
|
if (isTruthy(left)) {
|
|
return left; // Return the truthy value
|
|
} else {
|
|
return right; // Return the second value
|
|
}
|
|
}
|
|
}
|
|
}
|
|
|
|
// Mixed-type logical operations (string && boolean, etc.)
|
|
if (left.isString() && right.isBoolean()) {
|
|
bool right_bool = right.asBoolean();
|
|
|
|
switch (expression->oper.type) {
|
|
case AND: {
|
|
if (!isTruthy(left)) {
|
|
return left; // Return the falsy value
|
|
} else {
|
|
return right; // Return the second value
|
|
}
|
|
}
|
|
case OR: {
|
|
if (isTruthy(left)) {
|
|
return left; // Return the truthy value
|
|
} else {
|
|
return right; // Return the second value
|
|
}
|
|
}
|
|
case PLUS: return left + right;
|
|
}
|
|
}
|
|
|
|
if (left.isBoolean() && right.isString()) {
|
|
bool left_bool = left.asBoolean();
|
|
|
|
switch (expression->oper.type) {
|
|
case AND: {
|
|
if (!isTruthy(left)) {
|
|
return left; // Return the falsy value
|
|
} else {
|
|
return right; // Return the second value
|
|
}
|
|
}
|
|
case OR: {
|
|
if (isTruthy(left)) {
|
|
return left; // Return the truthy value
|
|
} else {
|
|
return right; // Return the second value
|
|
}
|
|
}
|
|
case PLUS: return left + right;
|
|
}
|
|
}
|
|
|
|
if (left.isString() && right.isNumber()) {
|
|
double right_num = right.asNumber();
|
|
|
|
switch (expression->oper.type) {
|
|
case AND: {
|
|
if (!isTruthy(left)) {
|
|
return left; // Return the falsy value
|
|
} else {
|
|
return right; // Return the second value
|
|
}
|
|
}
|
|
case OR: {
|
|
if (isTruthy(left)) {
|
|
return left; // Return the truthy value
|
|
} else {
|
|
return right; // Return the second value
|
|
}
|
|
}
|
|
case PLUS: return left + right;
|
|
case STAR: {
|
|
if (!isWholeNumer(right_num)) {
|
|
if (errorReporter) {
|
|
errorReporter->reportError(expression->oper.line, expression->oper.column, "Invalid String Multiplication",
|
|
"String multiplier must be a whole number");
|
|
}
|
|
throw std::runtime_error("String multiplier must be whole number");
|
|
}
|
|
std::string result;
|
|
for (int i = 0; i < static_cast<int>(right_num); i++) {
|
|
result += left.asString();
|
|
}
|
|
return Value(result);
|
|
}
|
|
}
|
|
}
|
|
|
|
if (left.isNumber() && right.isString()) {
|
|
double left_num = left.asNumber();
|
|
|
|
switch (expression->oper.type) {
|
|
case AND: {
|
|
if (!isTruthy(left)) {
|
|
return left; // Return the falsy value
|
|
} else {
|
|
return right; // Return the second value
|
|
}
|
|
}
|
|
case OR: {
|
|
if (isTruthy(left)) {
|
|
return left; // Return the truthy value
|
|
} else {
|
|
return right; // Return the second value
|
|
}
|
|
}
|
|
case PLUS: return left + right;
|
|
case STAR: {
|
|
if (!isWholeNumer(left_num)) {
|
|
if (errorReporter) {
|
|
errorReporter->reportError(expression->oper.line, expression->oper.column, "Invalid String Multiplication",
|
|
"String multiplier must be a whole number");
|
|
}
|
|
throw std::runtime_error("String multiplier must be whole number");
|
|
}
|
|
std::string result;
|
|
for (int i = 0; i < static_cast<int>(left_num); i++) {
|
|
result += right.asString();
|
|
}
|
|
return Value(result);
|
|
}
|
|
}
|
|
}
|
|
|
|
if (left.isNone() && right.isString()) {
|
|
std::string right_string = right.asString();
|
|
|
|
switch (expression->oper.type) {
|
|
case PLUS: return left + right;
|
|
}
|
|
if (errorReporter) {
|
|
errorReporter->reportError(expression->oper.line, expression->oper.column, "Runtime Error",
|
|
"Cannot use '" + expression->oper.lexeme + "' on none and a string", expression->oper.lexeme);
|
|
}
|
|
throw std::runtime_error("Cannot use '" + expression->oper.lexeme + "' on none and a string");
|
|
}
|
|
|
|
if (left.isString() && right.isNone()) {
|
|
std::string left_string = left.asString();
|
|
|
|
switch (expression->oper.type) {
|
|
case PLUS: return left + right;
|
|
}
|
|
if (errorReporter) {
|
|
errorReporter->reportError(expression->oper.line, expression->oper.column, "Runtime Error",
|
|
"Cannot use '" + expression->oper.lexeme + "' on a string and none", expression->oper.lexeme);
|
|
}
|
|
throw std::runtime_error("Cannot use '" + expression->oper.lexeme + "' on a string and none");
|
|
}
|
|
else
|
|
{
|
|
if (errorReporter) {
|
|
errorReporter->reportError(expression->oper.line, expression->oper.column, "Runtime Error",
|
|
"Operands must be of same type when using: " + expression->oper.lexeme, expression->oper.lexeme);
|
|
}
|
|
throw std::runtime_error("Operands must be of same type when using: " + expression->oper.lexeme);
|
|
}
|
|
}
|
|
|
|
Value Interpreter::visitVarExpr(const std::shared_ptr<VarExpr>& expression)
|
|
{
|
|
return environment->get(expression->name);
|
|
}
|
|
|
|
Value Interpreter::visitIncrementExpr(const std::shared_ptr<IncrementExpr>& expression) {
|
|
// Get the current value of the operand
|
|
Value currentValue = evaluate(expression->operand);
|
|
|
|
if (!currentValue.isNumber()) {
|
|
if (errorReporter) {
|
|
errorReporter->reportError(expression->oper.line, expression->oper.column,
|
|
"Runtime Error", "Increment/decrement can only be applied to numbers.", "");
|
|
}
|
|
throw std::runtime_error("Increment/decrement can only be applied to numbers.");
|
|
}
|
|
|
|
double currentNum = currentValue.asNumber();
|
|
double newValue;
|
|
|
|
// Determine the operation based on the operator
|
|
if (expression->oper.type == PLUS_PLUS) {
|
|
newValue = currentNum + 1.0;
|
|
} else if (expression->oper.type == MINUS_MINUS) {
|
|
newValue = currentNum - 1.0;
|
|
} else {
|
|
if (errorReporter) {
|
|
errorReporter->reportError(expression->oper.line, expression->oper.column,
|
|
"Runtime Error", "Invalid increment/decrement operator.", "");
|
|
}
|
|
throw std::runtime_error("Invalid increment/decrement operator.");
|
|
}
|
|
|
|
// Update the variable if it's a variable expression
|
|
if (auto varExpr = std::dynamic_pointer_cast<VarExpr>(expression->operand)) {
|
|
environment->assign(varExpr->name, Value(newValue));
|
|
} else {
|
|
if (errorReporter) {
|
|
errorReporter->reportError(expression->oper.line, expression->oper.column,
|
|
"Runtime Error", "Increment/decrement can only be applied to variables.", "");
|
|
}
|
|
throw std::runtime_error("Increment/decrement can only be applied to variables.");
|
|
}
|
|
|
|
// Return the appropriate value based on prefix/postfix
|
|
if (expression->isPrefix) {
|
|
return Value(newValue); // Prefix: return new value
|
|
} else {
|
|
return currentValue; // Postfix: return old value
|
|
}
|
|
}
|
|
|
|
void Interpreter::addStdLibFunctions() {
|
|
// Add standard library functions to the environment
|
|
StdLib::addToEnvironment(environment, *this, errorReporter);
|
|
}
|
|
|
|
void Interpreter::addBuiltinFunction(std::shared_ptr<BuiltinFunction> func) {
|
|
builtinFunctions.push_back(func);
|
|
}
|
|
|
|
Value Interpreter::visitAssignExpr(const std::shared_ptr<AssignExpr>& expression) {
|
|
Value value = evaluate(expression->value);
|
|
|
|
switch (expression->op.type) {
|
|
case PLUS_EQUAL:
|
|
case MINUS_EQUAL:
|
|
case STAR_EQUAL:
|
|
case SLASH_EQUAL:
|
|
case PERCENT_EQUAL:
|
|
case BIN_AND_EQUAL:
|
|
case BIN_OR_EQUAL:
|
|
case BIN_XOR_EQUAL:
|
|
case BIN_SLEFT_EQUAL:
|
|
case BIN_SRIGHT_EQUAL: {
|
|
Value currentValue = environment->get(expression->name.lexeme);
|
|
switch (expression->op.type) {
|
|
case PLUS_EQUAL:
|
|
value = currentValue + value;
|
|
break;
|
|
case MINUS_EQUAL:
|
|
value = currentValue - value;
|
|
break;
|
|
case STAR_EQUAL:
|
|
value = currentValue * value;
|
|
break;
|
|
case SLASH_EQUAL:
|
|
value = currentValue / value;
|
|
break;
|
|
case PERCENT_EQUAL:
|
|
value = currentValue % value;
|
|
break;
|
|
case BIN_AND_EQUAL:
|
|
value = currentValue & value;
|
|
break;
|
|
case BIN_OR_EQUAL:
|
|
value = currentValue | value;
|
|
break;
|
|
case BIN_XOR_EQUAL:
|
|
value = currentValue ^ value;
|
|
break;
|
|
case BIN_SLEFT_EQUAL:
|
|
value = currentValue << value;
|
|
break;
|
|
case BIN_SRIGHT_EQUAL:
|
|
value = currentValue >> value;
|
|
break;
|
|
default:
|
|
break;
|
|
}
|
|
break;
|
|
}
|
|
default:
|
|
break;
|
|
}
|
|
environment->assign(expression->name, value);
|
|
return value;
|
|
}
|
|
|
|
Value Interpreter::visitCallExpr(const std::shared_ptr<CallExpr>& expression) {
|
|
Value callee = evaluate(expression->callee);
|
|
|
|
std::vector<Value> arguments;
|
|
for (const std::shared_ptr<Expr>& argument : expression->arguments) {
|
|
arguments.push_back(evaluate(argument));
|
|
}
|
|
|
|
if (callee.isBuiltinFunction()) {
|
|
// Builtin functions now work directly with Value and receive line and column
|
|
return callee.asBuiltinFunction()->func(arguments, expression->paren.line, expression->paren.column);
|
|
}
|
|
|
|
if (callee.isFunction()) {
|
|
Function* function = callee.asFunction();
|
|
if (arguments.size() != function->params.size()) {
|
|
throw std::runtime_error("Expected " + std::to_string(function->params.size()) +
|
|
" arguments but got " + std::to_string(arguments.size()) + ".");
|
|
}
|
|
|
|
auto previousEnv = environment;
|
|
environment = std::make_shared<Environment>(function->closure);
|
|
environment->setErrorReporter(errorReporter);
|
|
|
|
for (size_t i = 0; i < function->params.size(); i++) {
|
|
environment->define(function->params[i], arguments[i]);
|
|
}
|
|
|
|
ExecutionContext context;
|
|
context.isFunctionBody = true;
|
|
|
|
for (const auto& stmt : function->body) {
|
|
execute(stmt, &context);
|
|
if (context.hasReturn) {
|
|
environment = previousEnv;
|
|
return context.returnValue;
|
|
}
|
|
}
|
|
|
|
environment = previousEnv;
|
|
return context.returnValue;
|
|
}
|
|
|
|
throw std::runtime_error("Can only call functions and classes.");
|
|
}
|
|
|
|
Value Interpreter::visitFunctionExpr(const std::shared_ptr<FunctionExpr>& expression) {
|
|
// Convert Token parameters to string parameters
|
|
std::vector<std::string> paramNames;
|
|
for (const Token& param : expression->params) {
|
|
paramNames.push_back(param.lexeme);
|
|
}
|
|
|
|
auto function = msptr(Function)("anonymous", paramNames, expression->body, environment);
|
|
functions.push_back(function); // Keep the shared_ptr alive
|
|
return Value(function.get());
|
|
}
|
|
|
|
void Interpreter::visitBlockStmt(const std::shared_ptr<BlockStmt>& statement, ExecutionContext* context) {
|
|
auto newEnv = std::make_shared<Environment>(environment);
|
|
newEnv->setErrorReporter(errorReporter);
|
|
executeBlock(statement->statements, newEnv, context);
|
|
}
|
|
|
|
void Interpreter::visitExpressionStmt(const std::shared_ptr<ExpressionStmt>& statement, ExecutionContext* context) {
|
|
Value value = evaluate(statement->expression);
|
|
|
|
if(IsInteractive)
|
|
std::cout << "\u001b[38;5;8m[" << stringify(value) << "]\u001b[38;5;15m" << std::endl;
|
|
}
|
|
|
|
|
|
|
|
void Interpreter::visitVarStmt(const std::shared_ptr<VarStmt>& statement, ExecutionContext* context)
|
|
{
|
|
Value value = NONE_VALUE;
|
|
if(statement->initializer != nullptr)
|
|
{
|
|
value = evaluate(statement->initializer);
|
|
}
|
|
|
|
//std::cout << "Visit var stmt: " << statement->name.lexeme << " set to: " << stringify(value) << std::endl;
|
|
|
|
environment->define(statement->name.lexeme, value);
|
|
}
|
|
|
|
void Interpreter::visitFunctionStmt(const std::shared_ptr<FunctionStmt>& statement, ExecutionContext* context)
|
|
{
|
|
// Convert Token parameters to string parameters
|
|
std::vector<std::string> paramNames;
|
|
for (const Token& param : statement->params) {
|
|
paramNames.push_back(param.lexeme);
|
|
}
|
|
|
|
auto function = msptr(Function)(statement->name.lexeme,
|
|
paramNames,
|
|
statement->body,
|
|
environment);
|
|
functions.push_back(function); // Keep the shared_ptr alive
|
|
environment->define(statement->name.lexeme, Value(function.get()));
|
|
}
|
|
|
|
void Interpreter::visitReturnStmt(const std::shared_ptr<ReturnStmt>& statement, ExecutionContext* context)
|
|
{
|
|
Value value = NONE_VALUE;
|
|
if (statement->value != nullptr) {
|
|
value = evaluate(statement->value);
|
|
}
|
|
|
|
if (context && context->isFunctionBody) {
|
|
context->hasReturn = true;
|
|
context->returnValue = value;
|
|
}
|
|
// If no context or not in function body, this is a top-level return (ignored)
|
|
}
|
|
|
|
void Interpreter::visitIfStmt(const std::shared_ptr<IfStmt>& statement, ExecutionContext* context)
|
|
{
|
|
if (isTruthy(evaluate(statement->condition))) {
|
|
execute(statement->thenBranch, context);
|
|
} else if (statement->elseBranch != nullptr) {
|
|
execute(statement->elseBranch, context);
|
|
}
|
|
}
|
|
|
|
void Interpreter::interpret(std::vector<std::shared_ptr<Stmt> > statements) {
|
|
for(const std::shared_ptr<Stmt>& s : statements)
|
|
{
|
|
execute(s, nullptr); // No context needed for top-level execution
|
|
}
|
|
}
|
|
|
|
void Interpreter::execute(const std::shared_ptr<Stmt>& statement, ExecutionContext* context)
|
|
{
|
|
statement->accept(this, context);
|
|
}
|
|
|
|
void Interpreter::executeBlock(std::vector<std::shared_ptr<Stmt> > statements, std::shared_ptr<Environment> env, ExecutionContext* context)
|
|
{
|
|
std::shared_ptr<Environment> previous = this->environment;
|
|
this->environment = env;
|
|
|
|
for(const std::shared_ptr<Stmt>& s : statements)
|
|
{
|
|
execute(s, context);
|
|
if (context && context->hasReturn) {
|
|
this->environment = previous;
|
|
return;
|
|
}
|
|
}
|
|
|
|
this->environment = previous;
|
|
}
|
|
|
|
Value Interpreter::evaluate(const std::shared_ptr<Expr>& expr) {
|
|
return expr->accept(this);
|
|
}
|
|
|
|
bool Interpreter::isTruthy(Value object) {
|
|
|
|
if(object.isBoolean())
|
|
{
|
|
return object.asBoolean();
|
|
}
|
|
|
|
if(object.isNone())
|
|
{
|
|
return false;
|
|
}
|
|
|
|
if(object.isNumber())
|
|
{
|
|
return object.asNumber() != 0;
|
|
}
|
|
|
|
if(object.isString())
|
|
{
|
|
return object.asString().length() > 0;
|
|
}
|
|
|
|
return true;
|
|
}
|
|
|
|
bool Interpreter::isEqual(Value a, Value b) {
|
|
if(a.isNumber())
|
|
{
|
|
if(b.isNumber())
|
|
{
|
|
return a.asNumber() == b.asNumber();
|
|
}
|
|
|
|
return false;
|
|
}
|
|
else if(a.isBoolean())
|
|
{
|
|
if(b.isBoolean())
|
|
{
|
|
return a.asBoolean() == b.asBoolean();
|
|
}
|
|
|
|
return false;
|
|
}
|
|
else if(a.isString())
|
|
{
|
|
if(b.isString())
|
|
{
|
|
return a.asString() == b.asString();
|
|
}
|
|
|
|
return false;
|
|
}
|
|
else if(a.isNone())
|
|
{
|
|
if(b.isNone())
|
|
{
|
|
return true;
|
|
}
|
|
|
|
return false;
|
|
}
|
|
|
|
throw std::runtime_error("Invalid isEqual compariosn");
|
|
}
|
|
|
|
std::string Interpreter::stringify(Value object) {
|
|
if(object.isNone())
|
|
{
|
|
return "none";
|
|
}
|
|
else if(object.isNumber())
|
|
{
|
|
double integral = object.asNumber();
|
|
double fractional = std::modf(object.asNumber(), &integral);
|
|
|
|
std::stringstream ss;
|
|
if(std::abs(fractional) < std::numeric_limits<double>::epsilon())
|
|
{
|
|
ss << std::fixed << std::setprecision(0) << integral;
|
|
return ss.str();
|
|
}
|
|
else
|
|
{
|
|
ss << std::fixed << std::setprecision(std::numeric_limits<double>::digits10 - 1) << object.asNumber();
|
|
std::string str = ss.str();
|
|
str.erase(str.find_last_not_of('0') + 1, std::string::npos);
|
|
if (str.back() == '.') {
|
|
str.pop_back();
|
|
}
|
|
|
|
return str;
|
|
}
|
|
}
|
|
else if(object.isString())
|
|
{
|
|
return object.asString();
|
|
}
|
|
else if(object.isBoolean())
|
|
{
|
|
return object.asBoolean() == 1 ? "true" : "false";
|
|
}
|
|
else if(object.isFunction())
|
|
{
|
|
return "<function " + object.asFunction()->name + ">";
|
|
}
|
|
else if(object.isBuiltinFunction())
|
|
{
|
|
return "<builtin_function " + object.asBuiltinFunction()->name + ">";
|
|
}
|
|
|
|
throw std::runtime_error("Could not convert object to string");
|
|
}
|
|
|
|
bool Interpreter::isWholeNumer(double num) {
|
|
double integral = num;
|
|
double fractional = std::modf(num, &integral);
|
|
|
|
if(std::abs(fractional) < std::numeric_limits<double>::epsilon())
|
|
{
|
|
return true;
|
|
}
|
|
else
|
|
{
|
|
return false;
|
|
}
|
|
}
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|