257 lines
12 KiB
C++
257 lines
12 KiB
C++
#include "lang/lexer.hpp"
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#include <vector>
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#include <functional>
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namespace hex::lang {
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Lexer::Lexer() { }
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std::string matchTillInvalid(const char* characters, std::function<bool(char)> predicate) {
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std::string ret;
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while (*characters != 0x00) {
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ret += *characters;
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characters++;
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if (!predicate(*characters))
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break;
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}
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return ret;
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}
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std::optional<u64> parseInt(std::string_view string) {
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u64 integer = 0;
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u8 base;
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std::string_view numberData;
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if (string.starts_with("0x")) {
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numberData = string.substr(2);
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base = 16;
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if (numberData.find_first_not_of("0123456789ABCDEFabcdef") != std::string_view::npos)
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return { };
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} else if (string.starts_with("0b")) {
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numberData = string.substr(2);
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base = 2;
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if (numberData.find_first_not_of("01") != std::string_view::npos)
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return { };
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} else if (isdigit(string[0])) {
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numberData = string;
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base = 10;
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if (numberData.find_first_not_of("0123456789") != std::string_view::npos)
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return { };
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} else return { };
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if (numberData.length() == 0)
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return { };
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for (const char& c : numberData) {
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integer *= base;
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if (isdigit(c))
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integer += (c - '0');
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else if (c >= 'A' && c <= 'F')
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integer += 10 + (c - 'A');
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else if (c >= 'a' && c <= 'f')
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integer += 10 + (c - 'a');
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else return { };
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}
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return integer;
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}
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std::pair<Result, std::vector<Token>> Lexer::lex(const std::string& code) {
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std::vector<Token> tokens;
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u32 offset = 0;
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u32 lineNumber = 1;
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while (offset < code.length()) {
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// Handle comments
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if (code[offset] == '/') {
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offset++;
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if (offset < code.length() && code[offset] == '/') {
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offset++;
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while (offset < code.length()) {
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if (code[offset] == '\n' || code[offset] == '\r')
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break;
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offset++;
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}
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} else if (offset < code.length() && code[offset] == '*') {
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offset++;
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while (offset < (code.length() - 1)) {
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if (code[offset] == '\n') lineNumber++;
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if (code[offset] == '*' && code[offset + 1] == '/')
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break;
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offset++;
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}
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offset += 2;
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} else offset--;
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}
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const char& c = code[offset];
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if (c == 0x00)
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break;
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if (std::isblank(c) || std::isspace(c)) {
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if (code[offset] == '\n') lineNumber++;
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offset += 1;
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} else if (c == ';') {
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tokens.push_back({ .type = Token::Type::EndOfExpression, .lineNumber = lineNumber });
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offset += 1;
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} else if (c == '{') {
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tokens.push_back({ .type = Token::Type::ScopeOpen, .lineNumber = lineNumber });
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offset += 1;
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} else if (c == '}') {
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tokens.push_back({ .type = Token::Type::ScopeClose, .lineNumber = lineNumber });
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offset += 1;
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} else if (c == '[') {
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tokens.push_back({ .type = Token::Type::ArrayOpen, .lineNumber = lineNumber });
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offset += 1;
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} else if (c == ']') {
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tokens.push_back({.type = Token::Type::ArrayClose, .lineNumber = lineNumber });
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offset += 1;
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} else if (c == ',') {
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tokens.push_back({ .type = Token::Type::Separator, .lineNumber = lineNumber });
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offset += 1;
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} else if (c == '@') {
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tokens.push_back({ .type = Token::Type::Operator, .operatorToken = { .op = Token::OperatorToken::Operator::AtDeclaration }, .lineNumber = lineNumber });
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offset += 1;
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} else if (c == '=') {
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tokens.push_back({ .type = Token::Type::Operator, .operatorToken = { .op = Token::OperatorToken::Operator::Assignment }, .lineNumber = lineNumber });
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offset += 1;
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} else if (c == ':') {
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tokens.push_back({ .type = Token::Type::Operator, .operatorToken = { .op = Token::OperatorToken::Operator::Inherit }, .lineNumber = lineNumber });
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offset += 1;
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} else if (c == '*') {
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tokens.push_back({ .type = Token::Type::Operator, .operatorToken = { .op = Token::OperatorToken::Operator::Star }, .lineNumber = lineNumber });
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offset += 1;
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} else if (c == '\'') {
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offset += 1;
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if (offset >= code.length()) {
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this->m_error = { lineNumber, "Invalid character literal" };
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return { ResultLexicalError, { } };
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}
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char character = code[offset];
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if (character == '\\') {
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offset += 1;
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if (offset >= code.length()) {
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this->m_error = { lineNumber, "Invalid character literal" };
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return { ResultLexicalError, { } };
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}
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if (code[offset] != '\\' && code[offset] != '\'') {
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this->m_error = { lineNumber, "Invalid escape sequence" };
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return { ResultLexicalError, { } };
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}
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character = code[offset];
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} else {
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if (code[offset] == '\\' || code[offset] == '\'' || character == '\n' || character == '\r') {
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this->m_error = { lineNumber, "Invalid character literal" };
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return { ResultLexicalError, { } };
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}
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}
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offset += 1;
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if (offset >= code.length() || code[offset] != '\'') {
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this->m_error = { lineNumber, "Missing terminating ' after character literal" };
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return { ResultLexicalError, { } };
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}
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tokens.push_back({ .type = Token::Type::Integer, .integerToken = { .integer = character }, .lineNumber = lineNumber });
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offset += 1;
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} else if (std::isalpha(c)) {
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std::string identifier = matchTillInvalid(&code[offset], [](char c) -> bool { return std::isalnum(c) || c == '_'; });
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// Check for reserved keywords
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if (identifier == "struct")
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tokens.push_back({ .type = Token::Type::Keyword, .keywordToken = { .keyword = Token::KeywordToken::Keyword::Struct }, .lineNumber = lineNumber });
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else if (identifier == "union")
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tokens.push_back({ .type = Token::Type::Keyword, .keywordToken = { .keyword = Token::KeywordToken::Keyword::Union }, .lineNumber = lineNumber });
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else if (identifier == "using")
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tokens.push_back({ .type = Token::Type::Keyword, .keywordToken = { .keyword = Token::KeywordToken::Keyword::Using }, .lineNumber = lineNumber });
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else if (identifier == "enum")
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tokens.push_back({ .type = Token::Type::Keyword, .keywordToken = { .keyword = Token::KeywordToken::Keyword::Enum }, .lineNumber = lineNumber });
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else if (identifier == "bitfield")
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tokens.push_back({ .type = Token::Type::Keyword, .keywordToken = { .keyword = Token::KeywordToken::Keyword::Bitfield }, .lineNumber = lineNumber });
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else if (identifier == "be")
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tokens.push_back({ .type = Token::Type::Keyword, .keywordToken = { .keyword = Token::KeywordToken::Keyword::BigEndian }, .lineNumber = lineNumber });
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else if (identifier == "le")
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tokens.push_back({ .type = Token::Type::Keyword, .keywordToken = { .keyword = Token::KeywordToken::Keyword::LittleEndian }, .lineNumber = lineNumber });
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// Check for built-in types
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else if (identifier == "u8")
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tokens.push_back({ .type = Token::Type::Type, .typeToken = { .type = Token::TypeToken::Type::Unsigned8Bit }, .lineNumber = lineNumber });
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else if (identifier == "s8")
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tokens.push_back({ .type = Token::Type::Type, .typeToken = { .type = Token::TypeToken::Type::Signed8Bit }, .lineNumber = lineNumber });
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else if (identifier == "u16")
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tokens.push_back({ .type = Token::Type::Type, .typeToken = { .type = Token::TypeToken::Type::Unsigned16Bit }, .lineNumber = lineNumber });
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else if (identifier == "s16")
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tokens.push_back({ .type = Token::Type::Type, .typeToken = { .type = Token::TypeToken::Type::Signed16Bit }, .lineNumber = lineNumber });
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else if (identifier == "u32")
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tokens.push_back({ .type = Token::Type::Type, .typeToken = { .type = Token::TypeToken::Type::Unsigned32Bit }, .lineNumber = lineNumber });
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else if (identifier == "s32")
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tokens.push_back({ .type = Token::Type::Type, .typeToken = { .type = Token::TypeToken::Type::Signed32Bit }, .lineNumber = lineNumber });
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else if (identifier == "u64")
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tokens.push_back({ .type = Token::Type::Type, .typeToken = { .type = Token::TypeToken::Type::Unsigned64Bit }, .lineNumber = lineNumber });
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else if (identifier == "s64")
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tokens.push_back({ .type = Token::Type::Type, .typeToken = { .type = Token::TypeToken::Type::Signed64Bit }, .lineNumber = lineNumber });
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else if (identifier == "u128")
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tokens.push_back({ .type = Token::Type::Type, .typeToken = { .type = Token::TypeToken::Type::Unsigned128Bit }, .lineNumber = lineNumber });
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else if (identifier == "s128")
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tokens.push_back({ .type = Token::Type::Type, .typeToken = { .type = Token::TypeToken::Type::Signed128Bit }, .lineNumber = lineNumber });
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else if (identifier == "float")
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tokens.push_back({ .type = Token::Type::Type, .typeToken = { .type = Token::TypeToken::Type::Float }, .lineNumber = lineNumber });
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else if (identifier == "double")
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tokens.push_back({ .type = Token::Type::Type, .typeToken = { .type = Token::TypeToken::Type::Double }, .lineNumber = lineNumber });
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else if (identifier == "padding")
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tokens.push_back({ .type = Token::Type::Type, .typeToken = { .type = Token::TypeToken::Type::Padding }, .lineNumber = lineNumber });
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// If it's not a keyword and a builtin type, it has to be an identifier
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else
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tokens.push_back({.type = Token::Type::Identifier, .identifierToken = { .identifier = identifier }, .lineNumber = lineNumber });
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offset += identifier.length();
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} else if (std::isdigit(c)) {
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char *end = nullptr;
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std::strtoull(&code[offset], &end, 0);
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auto integer = parseInt(std::string_view(&code[offset], end - &code[offset]));
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if (!integer.has_value()) {
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this->m_error = { lineNumber, "Invalid integer literal" };
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return { ResultLexicalError, {}};
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}
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tokens.push_back({ .type = Token::Type::Integer, .integerToken = { .integer = integer.value() }, .lineNumber = lineNumber });
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offset += (end - &code[offset]);
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} else {
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this->m_error = { lineNumber, "Unknown token" };
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return { ResultLexicalError, {} };
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}
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}
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tokens.push_back({ .type = Token::Type::EndOfProgram, .lineNumber = lineNumber });
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return { ResultSuccess, tokens };
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}
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} |