#ifndef PARSER_HPP
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#define PARSER_HPP
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#include <stdexcept>
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#include <string>
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#include <vector>
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#include "BaseException.hpp"
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#include "Lexer/Token.hpp"
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#include "Lexer/TokenType.hpp"
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#include "Parser/ParsedExpression.hpp"
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#include "Symbols/ParameterContainer.hpp"
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#include "Symbols/Value.hpp"
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namespace Parser {
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class Parser {
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public:
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Parser() {}
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class Exception : public BaseException {
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public:
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using BaseException::BaseException;
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Exception(const std::string & msg, const std::string & expected, const Lexer::Tokens::Token & token) {
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rawMessage_ = msg + ": " + token.dump();
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context_ =
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" at line: " + std::to_string(token.line_number) + ", column: " + std::to_string(token.column_number);
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if (expected.empty() == false) {
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rawMessage_ += " (expected: " + expected + ")";
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}
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formattedMessage_ = formatMessage();
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}
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Exception(const std::string & msg, const std::string & expected, int line, int col) {
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rawMessage_ = msg;
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if (expected.empty() == false) {
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rawMessage_ += " (expected: " + expected + ")";
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}
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context_ = " at line: " + std::to_string(line) + ", column: " + std::to_string(col);
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formattedMessage_ = formatMessage();
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}
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std::string formatMessage() const override { return "[Syntax ERROR] >>" + context_ + " << : " + rawMessage_; }
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};
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void parseScript(const std::vector<Lexer::Tokens::Token> & tokens, std::string_view input_string,
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const std::string & filename);
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static const std::unordered_map<std::string, Lexer::Tokens::Type> keywords;
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static const std::unordered_map<Lexer::Tokens::Type, Symbols::Variables::Type> variable_types;
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private:
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std::vector<Lexer::Tokens::Token> tokens_;
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std::string_view input_str_view_;
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size_t current_token_index_;
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std::string current_filename_;
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// Token stream handling and error-reporting helper functions (unchanged)
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const Lexer::Tokens::Token & currentToken() const {
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if (isAtEnd()) {
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// Technically we should never reach this if parseScript's loop is correct
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// But it's useful as a safety check
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if (!tokens_.empty() && tokens_.back().type == Lexer::Tokens::Type::END_OF_FILE) {
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return tokens_.back(); // return the EOF token
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}
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throw std::runtime_error("Unexpected end of token stream reached.");
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}
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return tokens_[current_token_index_];
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}
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// Look ahead in the token stream
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const Lexer::Tokens::Token & peekToken(size_t offset = 1) const {
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if (current_token_index_ + offset >= tokens_.size()) {
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// If at or beyond EOF, return the last token (should be EOF)
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if (!tokens_.empty()) {
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return tokens_.back();
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}
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throw std::runtime_error("Cannot peek beyond end of token stream.");
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}
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return tokens_[current_token_index_ + offset];
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}
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// Consume (advance past) the current token and return it
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Lexer::Tokens::Token consumeToken() {
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if (isAtEnd()) {
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throw std::runtime_error("Cannot consume token at end of stream.");
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}
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return tokens_[current_token_index_++];
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}
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// Check if current token type matches the expected type
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// If so, consume it and return true; otherwise return false
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bool match(Lexer::Tokens::Type expected_type) {
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if (isAtEnd()) {
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return false;
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}
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if (currentToken().type == expected_type) {
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consumeToken();
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return true;
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}
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return false;
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}
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// Check if current token type and value match the expected ones
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// Only use value checking for operators and punctuation
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bool match(Lexer::Tokens::Type expected_type, const std::string & expected_value) {
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if (isAtEnd()) {
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return false;
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}
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const auto & token = currentToken();
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if (token.type == expected_type && token.value == expected_value) {
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consumeToken();
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return true;
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}
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return false;
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}
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Lexer::Tokens::Token expect(Lexer::Tokens::Type expected_type) {
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if (isAtEnd()) {
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reportError("Unexpected end of file, expected token type: " + Lexer::Tokens::TypeToString(expected_type));
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}
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const auto & token = currentToken();
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if (token.type == expected_type) {
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return consumeToken();
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}
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reportError("Expected token type " + Lexer::Tokens::TypeToString(expected_type));
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// reportError throws; this return is never reached, but may satisfy the compiler
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return token; // or let reportError throw
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}
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// Like expect, but also checks the token's value
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Lexer::Tokens::Token expect(Lexer::Tokens::Type expected_type, const std::string & expected_value) {
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if (isAtEnd()) {
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reportError("Unexpected end of file, expected token: " + Lexer::Tokens::TypeToString(expected_type) +
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" with value '" + expected_value + "'");
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}
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const auto & token = currentToken();
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if (token.type == expected_type && token.value == expected_value) {
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return consumeToken();
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}
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reportError("Expected token " + Lexer::Tokens::TypeToString(expected_type) + " with value '" + expected_value +
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"'");
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return token; // reportError throws
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}
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// Check if we've reached the end of relevant tokens (just before EOF)
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bool isAtEnd() const {
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// We're at the end if the index equals the number of tokens,
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// or if only the EOF token remains (as the last element)
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return current_token_index_ >= tokens_.size() ||
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(current_token_index_ == tokens_.size() - 1 && tokens_.back().type == Lexer::Tokens::Type::END_OF_FILE);
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}
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[[noreturn]] void reportError(const std::string & message, const std::string & expected = "") {
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if (current_token_index_ < tokens_.size()) {
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throw Exception(message, expected, tokens_[current_token_index_]);
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}
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int line = tokens_.empty() ? 0 : tokens_.back().line_number;
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int col = tokens_.empty() ? 0 : tokens_.back().column_number;
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throw Exception(message, expected, line, col);
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}
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[[noreturn]] static void reportError(const std::string & message, const Lexer::Tokens::Token & token,
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const std::string & expected = "") {
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throw Exception(message, expected, token);
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}
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// parseStatement (unchanged)
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void parseStatement() {
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const auto & token_type = currentToken().type;
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if (token_type == Lexer::Tokens::Type::KEYWORD_FUNCTION_DECLARATION) {
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parseFunctionDefinition();
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return;
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}
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// Variable definition if leading token matches a type keyword
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if (Parser::variable_types.find(token_type) != Parser::variable_types.end()) {
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parseVariableDefinition();
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return;
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}
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// Function call if identifier followed by '('
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if (currentToken().type == Lexer::Tokens::Type::IDENTIFIER &&
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peekToken().type == Lexer::Tokens::Type::PUNCTUATION && peekToken().value == "(") {
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parseCallStatement();
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return;
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}
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reportError("Unexpected token at beginning of statement");
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}
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void parseVariableDefinition();
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void parseFunctionDefinition();
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// Parse a top-level function call statement (e.g., foo(arg1, arg2);)
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void parseCallStatement();
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// --- Parsing helper functions ---
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// type : KEYWORD_STRING | KEYWORD_INT | KEYWORD_DOUBLE
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// Returns the corresponding Symbols::Variables::Type enum and consumes the token
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Symbols::Variables::Type parseType() {
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const auto & token = currentToken();
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// Direct lookup for type keyword
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auto it = Parser::variable_types.find(token.type);
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if (it != Parser::variable_types.end()) {
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consumeToken();
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return it->second;
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}
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reportError("Expected type keyword (string, int, double, float)");
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}
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Symbols::Value parseValue(Symbols::Variables::Type expected_var_type) {
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Lexer::Tokens::Token token = currentToken();
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bool is_negative = false;
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// Handle unary sign
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if (token.type == Lexer::Tokens::Type::OPERATOR_ARITHMETIC && (token.lexeme == "-" || token.lexeme == "+") &&
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peekToken().type == Lexer::Tokens::Type::NUMBER) {
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is_negative = (token.lexeme == "-");
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token = peekToken();
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consumeToken(); // consumed the sign
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}
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// STRING type
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if (expected_var_type == Symbols::Variables::Type::STRING) {
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if (token.type == Lexer::Tokens::Type::STRING_LITERAL) {
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consumeToken();
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return Symbols::Value(token.value);
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}
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reportError("Expected string literal value");
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}
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// BOOLEAN type
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if (expected_var_type == Symbols::Variables::Type::BOOLEAN) {
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if (token.type == Lexer::Tokens::Type::KEYWORD && (token.value == "true" || token.value == "false")) {
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consumeToken();
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return Symbols::Value(token.value == "true");
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}
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reportError("Expected boolean literal value (true or false)");
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}
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// NUMERIC types
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if (expected_var_type == Symbols::Variables::Type::INTEGER ||
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expected_var_type == Symbols::Variables::Type::DOUBLE ||
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expected_var_type == Symbols::Variables::Type::FLOAT) {
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if (token.type == Lexer::Tokens::Type::NUMBER) {
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Symbols::Value val = parseNumericLiteral(token.value, is_negative, expected_var_type);
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consumeToken();
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return val;
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}
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reportError("Expected numeric literal value");
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}
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reportError("Unsupported variable type encountered during value parsing");
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return Symbols::Value(); // compiler happy
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}
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Symbols::Value parseNumericLiteral(const std::string & value, bool is_negative, Symbols::Variables::Type type);
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void parseFunctionBody(const Lexer::Tokens::Token & opening_brace, const std::string & function_name,
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Symbols::Variables::Type return_type, const Symbols::FunctionParameterInfo & params);
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ParsedExpressionPtr parseParsedExpression(const Symbols::Variables::Type & expected_var_type);
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}; // class Parser
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} // namespace Parser
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#endif // PARSER_HPP
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