#include "ScriptInterpreter.hpp"
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#include <iostream>
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#include <stdexcept>
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#include <unordered_map>
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#include <utility>
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#include "Lexer.hpp"
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#include "ScriptExceptionMacros.h"
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#include "Value.hpp"
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void ScriptInterpreter::registerModule(const std::string & name, std::shared_ptr<BaseFunction> fn) {
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functionObjects[name] = std::move(fn);
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}
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Value ScriptInterpreter::evaluateExpression(const Token & token) const {
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switch (token.type) {
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case TokenType::StringLiteral:
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return Value::fromString(token);
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case TokenType::IntLiteral:
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try {
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return Value::fromInt(token);
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} catch (const std::invalid_argument & e) {
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throw std::runtime_error("Invalid integer literal: " + token.lexeme);
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} catch (const std::out_of_range & e) {
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throw std::runtime_error("Integer literal out of range: " + token.lexeme);
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}
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case TokenType::DoubleLiteral:
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try {
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return Value::fromDouble(token);
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} catch (const std::invalid_argument & e) {
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throw std::runtime_error("Invalid double literal: " + token.lexeme);
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} catch (const std::out_of_range & e) {
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throw std::runtime_error("Double literal out of range: " + token.lexeme);
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}
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case TokenType::BooleanLiteral:
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case TokenType::Identifier:
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{
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return Value::fromBoolean(token);
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}
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case TokenType::Variable:
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return this->getVariable(token, this->contextPrefix, __FILE__, __LINE__);
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default:
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THROW_UNEXPECTED_TOKEN_ERROR(token, "string, integer, double, or variable");
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}
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return Value();
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}
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std::vector<Value> ScriptInterpreter::parseFunctionArguments(const std::vector<Token> & tokens,
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std::size_t & index) const {
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std::vector<Value> args;
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size_t current_index = index;
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if (current_index >= tokens.size() || tokens[current_index].type != TokenType::LeftParenthesis) {
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THROW_UNEXPECTED_TOKEN_ERROR(tokens[current_index], tokenTypeNames.at(TokenType::LeftParenthesis));
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}
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current_index++; // Skip '('
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while (current_index < tokens.size() && tokens[current_index].type != TokenType::RightParenthesis) {
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args.push_back(evaluateExpression(tokens[current_index]));
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current_index++;
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if (current_index < tokens.size() && tokens[current_index].type == TokenType::Comma) {
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current_index++; // Skip ','
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if (current_index >= tokens.size() || tokens[current_index].type == TokenType::RightParenthesis) {
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THROW_UNEXPECTED_TOKEN_ERROR(tokens[current_index], "expression after comma");
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}
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} else if (tokens[current_index].type != TokenType::RightParenthesis && current_index < tokens.size()) {
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THROW_UNEXPECTED_TOKEN_ERROR(tokens[current_index], "',' or ')'");
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}
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}
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if (current_index >= tokens.size() || tokens[current_index].type != TokenType::RightParenthesis) {
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THROW_UNEXPECTED_TOKEN_ERROR(tokens[current_index], "')'");
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}
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current_index++; // Skip ')'
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index = current_index;
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return args;
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}
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void ScriptInterpreter::handleBooleanDeclaration(const std::vector<Token> & tokens, size_t & i) {
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if (tokens.size() <= i || tokens[i].type != TokenType::Identifier) {
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THROW_UNEXPECTED_TOKEN_ERROR(tokens[i], "variable name");
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}
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const Token & varToken = tokens[i++];
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if (i >= tokens.size()) {
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THROW_UNEXPECTED_TOKEN_ERROR(tokens[i + 1], "semicolon or assignment after variable name");
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}
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if (tokens[i].type == TokenType::Semicolon) {
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auto val = Value::fromBoolean(tokens[i]);
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this->setVariable(varToken.lexeme, val, this->contextPrefix, true);
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i++;
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} else if (tokens[i].type == TokenType::Equal) {
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i++;
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if (i >= tokens.size()) {
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//throw InterpreterException("Expected value after assignment.", tokens[i - 1]);
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THROW_UNEXPECTED_TOKEN_ERROR(tokens[i - 1], "value after assignment");
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}
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auto value = evaluateExpression(tokens[i]);
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if (value.type != Variables::Type::VT_BOOLEAN) {
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THROW_VARIABLE_TYPE_MISSMATCH_ERROR(varToken.lexeme, Variables::TypeToString(Variables::Type::VT_BOOLEAN),
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tokens[i].lexeme, value.TypeToString(), tokens[i]);
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}
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this->setVariable(varToken.lexeme, value, this->contextPrefix, true);
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i++;
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EXPECT_SEMICOLON(tokens, i, "after bool declaration");
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} else {
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EXPECT_SEMICOLON(tokens, i, "after bool declaration");
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}
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}
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void ScriptInterpreter::handleStringDeclaration(const std::vector<Token> & tokens, std::size_t & i) {
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const auto & varToken = tokens[i];
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i++; // Skip variable name
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if (i < tokens.size() && tokens[i].type == TokenType::Equals) {
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i++; // Skip '='
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if (i < tokens.size() && tokens[i].type == TokenType::Variable) {
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const auto variable = this->getVariable(tokens[i], this->contextPrefix, __FILE__, __LINE__);
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if (variable.type != Variables::Type::VT_STRING) {
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THROW_VARIABLE_TYPE_MISSMATCH_ERROR(varToken.lexeme,
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Variables::TypeToString(Variables::Type::VT_STRING),
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tokens[i].lexeme, variable.TypeToString(), tokens[i]);
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}
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auto value = variable;
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this->setVariable(varToken.lexeme, value, this->contextPrefix, true);
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i++; // Skip variable name
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EXPECT_SEMICOLON(tokens, i, "after string variable declaration");
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} else if (i < tokens.size() && tokens[i].type == TokenType::StringLiteral) {
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auto value = Value::fromString(tokens[i]);
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this->setVariable(varToken.lexeme, value, this->contextPrefix, true);
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i++; // Skip string literal
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EXPECT_SEMICOLON(tokens, i, "after string declaration");
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} else {
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THROW_UNEXPECTED_TOKEN_ERROR(tokens[i], "string literal after '='");
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}
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} else {
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THROW_UNEXPECTED_TOKEN_ERROR(tokens[i], "= after string declaration");
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}
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}
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void ScriptInterpreter::handleNumberDeclaration(const std::vector<Token> & tokens, std::size_t & i, TokenType type) {
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const auto & varToken = tokens[i];
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i++; // Skip variable name
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if (i < tokens.size() && tokens[i].type == TokenType::Equals) {
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i++; // Skip '='
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if (i < tokens.size()) {
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if (type == TokenType::IntDeclaration && tokens[i].type == TokenType::IntLiteral) {
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try {
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auto value = Value::fromInt(tokens[i]);
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this->setVariable(varToken.lexeme, value, this->contextPrefix, true);
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i++; // Skip int literal
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} catch (const std::invalid_argument & e) {
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throw std::runtime_error("Invalid integer literal in declaration: " + tokens[i].lexeme);
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} catch (const std::out_of_range & e) {
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throw std::runtime_error("Integer literal out of range in declaration: " + tokens[i].lexeme);
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}
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} else if (type == TokenType::DoubleDeclaration && tokens[i].type == TokenType::DoubleLiteral) {
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try {
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auto value = Value::fromDouble(tokens[i]);
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this->setVariable(varToken.lexeme, value, this->contextPrefix, true);
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i++; // Skip double literal
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} catch (const std::invalid_argument & e) {
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throw std::runtime_error("Invalid double literal in declaration: " + tokens[i].lexeme);
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} catch (const std::out_of_range & e) {
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throw std::runtime_error("Double literal out of range in declaration: " + tokens[i].lexeme);
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}
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} else {
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const std::string expectedType = type == TokenType::IntDeclaration ? "int" : "double";
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THROW_VARIABLE_TYPE_MISSMATCH_ERROR(varToken.lexeme, expectedType, "",
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getVariableTypeFromTokenTypeAsString(tokens[i].type), tokens[i]);
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}
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EXPECT_SEMICOLON(tokens, i, "after variable declaration");
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} else {
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THROW_UNEXPECTED_TOKEN_ERROR(tokens[i - 1], "literal after '='");
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}
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} else {
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THROW_UNEXPECTED_TOKEN_ERROR(tokens[i], "= after variable declaration, variable name: " + varToken.lexeme);
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}
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}
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void ScriptInterpreter::handleFunctionDeclaration(const std::vector<Token> & tokens, std::size_t & i) {
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const auto & funcToken = tokens[i];
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i++; // skip funct name
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if (i < tokens.size() && tokens[i].type != TokenType::Equals) {
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THROW_UNEXPECTED_TOKEN_ERROR(tokens[i], "= after function declaration");
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}
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i++; // skip '='
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if (this->functionBodies.find(funcToken.lexeme) != this->functionBodies.end()) {
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THROW_FUNCTION_REDEFINITION_ERROR(funcToken.lexeme, tokens[i]);
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}
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if (i < tokens.size() && tokens[i].type != TokenType::LeftParenthesis) {
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THROW_UNEXPECTED_TOKEN_ERROR(tokens[i - 1], "");
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}
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i++;
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// parse arg definitions
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const std::string context_name = this->getContextName(funcToken.lexeme);
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const auto args = ScriptInterpreterHelpers::parseFunctionDeclarationArguments(tokens, i, __FILE__, __LINE__);
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for (const auto & arg : args) {
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auto value = arg;
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this->setVariable(arg.GetToken().lexeme, value, context_name, true);
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}
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size_t start;
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size_t end;
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ScriptInterpreterHelpers::getFunctionBody(tokens, i, start, end);
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const std::string function_body = StringHelpers::extractSubstring(this->source, start, end);
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if (function_body.empty()) {
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std::cout << this->source << '\n';
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THROW_FUNCTION_BODY_EMPTY(funcToken.lexeme, tokens[i - 1]);
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}
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this->functionBodies[funcToken.lexeme] = function_body;
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// recheck the close curly brace
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if (i >= tokens.size() || tokens[i].type != TokenType::RightCurlyBracket) {
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THROW_UNEXPECTED_TOKEN_ERROR(tokens[i], "}");
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}
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i++;
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}
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void ScriptInterpreter::handleFunctionCall(const std::vector<Token> & tokens, std::size_t & i) {
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const auto & functiontoken = tokens[i];
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i++; // skip funct name
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if (i < tokens.size() && tokens[i].type != TokenType::LeftParenthesis) {
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THROW_UNEXPECTED_TOKEN_ERROR(tokens[i - 1], "");
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}
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std::vector<Value> args = parseFunctionArguments(tokens, i);
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auto it1 = functionObjects.find(functiontoken.lexeme);
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if (it1 != functionObjects.end()) {
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it1->second->call(args);
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} else {
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auto it2 = functionBodies.find(functiontoken.lexeme);
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if (it2 == functionBodies.end()) {
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THROW_UNDEFINED_FUNCTION_ERROR(functiontoken.lexeme, tokens[i]);
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}
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if (args.size() > 0) {
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auto varList = this->getcontextVariables(this->getContextName(functiontoken.lexeme));
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if (varList.size() != args.size()) {
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THROW_FUNCTION_ARG_COUNT_MISMATCH_ERROR(functiontoken.lexeme, varList.size(), args.size(), tokens[i]);
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}
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size_t counter = 0;
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for (auto & var : varList) {
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this->setVariable(var.first, args[counter], var.second.context, false, true);
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counter++;
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}
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}
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this->executeScript(it2->second, this->filename, functiontoken.lexeme, true);
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}
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//i++;
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EXPECT_SEMICOLON(tokens, i, "after function call");
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}
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void ScriptInterpreter::handleVariableReference(const std::vector<Token> & tokens, std::size_t & i) {
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const auto & varToken = tokens[i];
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i++; // Skip variable token to avoid infinite loop
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if (i < tokens.size() && tokens[i].type == TokenType::Equals) {
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i++; // Skip '='
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if (i < tokens.size()) {
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const auto variable = this->getVariable(varToken, this->contextPrefix, __FILE__, __LINE__);
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auto value = evaluateExpression(tokens[i]);
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this->setVariable(varToken.lexeme, value, this->contextPrefix, false);
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i++; // Skip value
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EXPECT_SEMICOLON(tokens, i, "after variable assignment");
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} else {
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THROW_UNEXPECTED_TOKEN_ERROR(tokens[i - 1], "value after '='");
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}
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} else {
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THROW_UNEXPECTED_TOKEN_ERROR(tokens[i - 1], "'=' for assignment");
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}
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}
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void ScriptInterpreter::executeScript(const std::string & source, const std::string & filename,
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const std::string & _namespace, bool ignore_tags) {
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std::string oldContext;
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std::string oldSource;
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this->filename = filename;
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if (!this->source.empty()) {
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oldSource = this->source;
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}
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this->source = source;
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if (!this->contextPrefix.empty()) {
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oldContext = this->contextPrefix;
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}
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this->contextPrefix = this->getContextName(_namespace);
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Lexer lexer(source, filename);
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auto tokens = lexer.tokenize();
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bool insideScript = false;
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for (std::size_t i = 0; i < tokens.size();) {
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const auto & token = tokens[i];
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if (token.type == TokenType::EndOfFile) {
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break;
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}
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if (token.type == TokenType::ParserOpenTag) {
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insideScript = true;
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i++; // Skip the open tag
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continue;
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}
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if (token.type == TokenType::ParserCloseTag) {
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insideScript = false;
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i++; // Skip the close tag
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continue;
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}
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if (insideScript == false && ignore_tags == false) {
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//std::cout << token.lexeme;
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i++;
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continue;
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}
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switch (token.type) {
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case TokenType::StringDeclaration:
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handleStringDeclaration(tokens, i);
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break;
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case TokenType::BooleanDeclaration:
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handleBooleanDeclaration(tokens, i);
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break;
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case TokenType::FunctionDeclaration:
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handleFunctionDeclaration(tokens, i);
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break;
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case TokenType::IntDeclaration:
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case TokenType::DoubleDeclaration:
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handleNumberDeclaration(tokens, i, token.type);
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break;
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case TokenType::FunctionCall:
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handleFunctionCall(tokens, i);
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break;
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case TokenType::Variable:
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handleVariableReference(tokens, i);
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break;
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case TokenType::Comment:
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handleComment(i);
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break;
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case TokenType::Semicolon:
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handleSemicolon(i);
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break;
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default:
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THROW_UNEXPECTED_TOKEN_ERROR(token, "");
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}
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}
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if (!oldContext.empty()) {
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this->contextPrefix = oldContext;
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oldContext.clear();
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}
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if (!oldSource.empty()) {
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this->source = oldSource;
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oldSource.clear();
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}
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}
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