487 lines
19 KiB
C++
487 lines
19 KiB
C++
#include <hex/pattern_language/lexer.hpp>
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#include <algorithm>
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#include <functional>
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#include <optional>
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#include <vector>
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namespace hex::pl {
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#define TOKEN(type, value) Token::Type::type, Token::type::value, lineNumber
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#define VALUE_TOKEN(type, value) Token::Type::type, value, lineNumber
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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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size_t getIntegerLiteralLength(const std::string &string) {
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return string.find_first_not_of("0123456789ABCDEFabcdef.xUL");
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}
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std::optional<Token::Literal> parseIntegerLiteral(const std::string &string) {
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Token::ValueType type = Token::ValueType::Any;
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Token::Literal result;
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u8 base;
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auto endPos = getIntegerLiteralLength(string);
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auto numberData = std::string_view(string).substr(0, endPos);
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if (numberData.ends_with('U')) {
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type = Token::ValueType::Unsigned128Bit;
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numberData.remove_suffix(1);
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} else if (!numberData.starts_with("0x") && !numberData.starts_with("0b")) {
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if (numberData.ends_with('F')) {
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type = Token::ValueType::Float;
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numberData.remove_suffix(1);
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} else if (numberData.ends_with('D')) {
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type = Token::ValueType::Double;
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numberData.remove_suffix(1);
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}
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}
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if (numberData.starts_with("0x")) {
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numberData = numberData.substr(2);
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base = 16;
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if (Token::isFloatingPoint(type))
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return { };
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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 (numberData.starts_with("0b")) {
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numberData = numberData.substr(2);
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base = 2;
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if (Token::isFloatingPoint(type))
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return { };
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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 (numberData.find('.') != std::string_view::npos || Token::isFloatingPoint(type)) {
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base = 10;
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if (type == Token::ValueType::Any)
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type = Token::ValueType::Double;
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if (std::count(numberData.begin(), numberData.end(), '.') > 1 || numberData.find_first_not_of("0123456789.") != std::string_view::npos)
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return { };
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if (numberData.ends_with('.'))
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return { };
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} else if (isdigit(numberData[0])) {
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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 (type == Token::ValueType::Any)
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type = Token::ValueType::Signed128Bit;
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if (numberData.length() == 0)
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return { };
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if (Token::isUnsigned(type) || Token::isSigned(type)) {
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u128 integer = 0;
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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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switch (type) {
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case Token::ValueType::Unsigned128Bit: return { u128(integer) };
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case Token::ValueType::Signed128Bit: return { s128(integer) };
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default: return { };
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}
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} else if (Token::isFloatingPoint(type)) {
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double floatingPoint = strtod(numberData.data(), nullptr);
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switch (type) {
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case Token::ValueType::Float: return { float(floatingPoint) };
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case Token::ValueType::Double: return { double(floatingPoint) };
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default: return { };
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}
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}
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return { };
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}
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std::optional<std::pair<char, size_t>> getCharacter(const std::string &string) {
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if (string.length() < 1)
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return { };
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// Escape sequences
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if (string[0] == '\\') {
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if (string.length() < 2)
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return { };
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// Handle simple escape sequences
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switch (string[1]) {
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case 'a': return {{ '\a', 2 }};
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case 'b': return {{ '\b', 2 }};
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case 'f': return {{ '\f', 2 }};
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case 'n': return {{ '\n', 2 }};
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case 'r': return {{ '\r', 2 }};
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case 't': return {{ '\t', 2 }};
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case 'v': return {{ '\v', 2 }};
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case '\\': return {{ '\\', 2 }};
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case '\'': return {{ '\'', 2 }};
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case '\"': return {{ '\"', 2 }};
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}
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// Hexadecimal number
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if (string[1] == 'x') {
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if (string.length() != 4)
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return { };
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if (!isxdigit(string[2]) || !isxdigit(string[3]))
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return { };
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return {{ std::strtoul(&string[2], nullptr, 16), 4 }};
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}
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// Octal number
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if (string[1] == 'o') {
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if (string.length() != 5)
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return { };
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if (string[2] < '0' || string[2] > '7' || string[3] < '0' || string[3] > '7' || string[4] < '0' || string[4] > '7')
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return { };
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return {{ std::strtoul(&string[2], nullptr, 8), 5 }};
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}
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return { };
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} else return {{ string[0], 1 }};
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}
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std::optional<std::pair<std::string, size_t>> getStringLiteral(const std::string &string) {
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if (!string.starts_with('\"'))
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return { };
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size_t size = 1;
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std::string result;
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while (string[size] != '\"') {
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auto character = getCharacter(string.substr(size));
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if (!character.has_value())
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return { };
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auto &[c, charSize] = character.value();
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result += c;
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size += charSize;
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if (size >= string.length())
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return { };
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}
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return {{ result, size + 1 }};
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}
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std::optional<std::pair<char, size_t>> getCharacterLiteral(const std::string &string) {
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if (string.empty())
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return { };
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if (string[0] != '\'')
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return { };
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auto character = getCharacter(string.substr(1));
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if (!character.has_value())
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return { };
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auto &[c, charSize] = character.value();
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if (string.length() >= charSize + 2 && string[charSize + 1] != '\'')
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return { };
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return {{ c, charSize + 2 }};
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}
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std::optional<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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try {
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while (offset < code.length()) {
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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.emplace_back(TOKEN(Separator, EndOfExpression));
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offset += 1;
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} else if (c == '(') {
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tokens.emplace_back(TOKEN(Separator, RoundBracketOpen));
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offset += 1;
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} else if (c == ')') {
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tokens.emplace_back(TOKEN(Separator, RoundBracketClose));
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offset += 1;
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} else if (c == '{') {
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tokens.emplace_back(TOKEN(Separator, CurlyBracketOpen));
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offset += 1;
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} else if (c == '}') {
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tokens.emplace_back(TOKEN(Separator, CurlyBracketClose));
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offset += 1;
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} else if (c == '[') {
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tokens.emplace_back(TOKEN(Separator, SquareBracketOpen));
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offset += 1;
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} else if (c == ']') {
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tokens.emplace_back(TOKEN(Separator, SquareBracketClose));
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offset += 1;
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} else if (c == ',') {
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tokens.emplace_back(TOKEN(Separator, Comma));
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offset += 1;
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} else if (c == '.') {
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tokens.emplace_back(TOKEN(Separator, Dot));
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offset += 1;
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} else if (code.substr(offset, 2) == "::") {
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tokens.emplace_back(TOKEN(Operator, ScopeResolution));
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offset += 2;
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} else if (c == '@') {
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tokens.emplace_back(TOKEN(Operator, AtDeclaration));
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offset += 1;
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} else if (code.substr(offset, 2) == "==") {
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tokens.emplace_back(TOKEN(Operator, BoolEquals));
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offset += 2;
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} else if (code.substr(offset, 2) == "!=") {
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tokens.emplace_back(TOKEN(Operator, BoolNotEquals));
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offset += 2;
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} else if (code.substr(offset, 2) == ">=") {
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tokens.emplace_back(TOKEN(Operator, BoolGreaterThanOrEquals));
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offset += 2;
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} else if (code.substr(offset, 2) == "<=") {
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tokens.emplace_back(TOKEN(Operator, BoolLessThanOrEquals));
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offset += 2;
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} else if (code.substr(offset, 2) == "&&") {
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tokens.emplace_back(TOKEN(Operator, BoolAnd));
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offset += 2;
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} else if (code.substr(offset, 2) == "||") {
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tokens.emplace_back(TOKEN(Operator, BoolOr));
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offset += 2;
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} else if (code.substr(offset, 2) == "^^") {
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tokens.emplace_back(TOKEN(Operator, BoolXor));
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offset += 2;
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} else if (c == '=') {
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tokens.emplace_back(TOKEN(Operator, Assignment));
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offset += 1;
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} else if (c == ':') {
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tokens.emplace_back(TOKEN(Operator, Inherit));
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offset += 1;
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} else if (c == '+') {
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tokens.emplace_back(TOKEN(Operator, Plus));
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offset += 1;
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} else if (c == '-') {
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tokens.emplace_back(TOKEN(Operator, Minus));
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offset += 1;
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} else if (c == '*') {
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tokens.emplace_back(TOKEN(Operator, Star));
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offset += 1;
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} else if (c == '/') {
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tokens.emplace_back(TOKEN(Operator, Slash));
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offset += 1;
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} else if (c == '%') {
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tokens.emplace_back(TOKEN(Operator, Percent));
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offset += 1;
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} else if (code.substr(offset, 2) == "<<") {
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tokens.emplace_back(TOKEN(Operator, ShiftLeft));
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offset += 2;
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} else if (code.substr(offset, 2) == ">>") {
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tokens.emplace_back(TOKEN(Operator, ShiftRight));
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offset += 2;
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} else if (c == '>') {
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tokens.emplace_back(TOKEN(Operator, BoolGreaterThan));
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offset += 1;
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} else if (c == '<') {
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tokens.emplace_back(TOKEN(Operator, BoolLessThan));
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offset += 1;
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} else if (c == '!') {
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tokens.emplace_back(TOKEN(Operator, BoolNot));
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offset += 1;
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} else if (c == '|') {
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tokens.emplace_back(TOKEN(Operator, BitOr));
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offset += 1;
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} else if (c == '&') {
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tokens.emplace_back(TOKEN(Operator, BitAnd));
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offset += 1;
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} else if (c == '^') {
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tokens.emplace_back(TOKEN(Operator, BitXor));
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offset += 1;
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} else if (c == '~') {
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tokens.emplace_back(TOKEN(Operator, BitNot));
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offset += 1;
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} else if (c == '?') {
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tokens.emplace_back(TOKEN(Operator, TernaryConditional));
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offset += 1;
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} else if (c == '$') {
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tokens.emplace_back(TOKEN(Operator, Dollar));
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offset += 1;
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} else if (code.substr(offset, 9) == "addressof") {
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tokens.emplace_back(TOKEN(Operator, AddressOf));
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offset += 9;
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}
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else if (code.substr(offset, 6) == "sizeof") {
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tokens.emplace_back(TOKEN(Operator, SizeOf));
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offset += 6;
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}
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else if (c == '\'') {
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auto character = getCharacterLiteral(code.substr(offset));
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if (!character.has_value())
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throwLexerError("invalid character literal", lineNumber);
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auto [c, charSize] = character.value();
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tokens.emplace_back(VALUE_TOKEN(Integer, Token::Literal(c)));
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offset += charSize;
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} else if (c == '\"') {
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auto string = getStringLiteral(code.substr(offset));
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if (!string.has_value())
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throwLexerError("invalid string literal", lineNumber);
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auto [s, stringSize] = string.value();
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tokens.emplace_back(VALUE_TOKEN(String, Token::Literal(s)));
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offset += stringSize;
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} else if (std::isalpha(c) || 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.emplace_back(TOKEN(Keyword, Struct));
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else if (identifier == "union")
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tokens.emplace_back(TOKEN(Keyword, Union));
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else if (identifier == "using")
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tokens.emplace_back(TOKEN(Keyword, Using));
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else if (identifier == "enum")
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tokens.emplace_back(TOKEN(Keyword, Enum));
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else if (identifier == "bitfield")
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tokens.emplace_back(TOKEN(Keyword, Bitfield));
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else if (identifier == "be")
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tokens.emplace_back(TOKEN(Keyword, BigEndian));
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else if (identifier == "le")
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tokens.emplace_back(TOKEN(Keyword, LittleEndian));
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else if (identifier == "if")
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tokens.emplace_back(TOKEN(Keyword, If));
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else if (identifier == "else")
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tokens.emplace_back(TOKEN(Keyword, Else));
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else if (identifier == "false")
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tokens.emplace_back(VALUE_TOKEN(Integer, Token::Literal(false)));
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else if (identifier == "true")
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tokens.emplace_back(VALUE_TOKEN(Integer, Token::Literal(true)));
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else if (identifier == "parent")
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tokens.emplace_back(TOKEN(Keyword, Parent));
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else if (identifier == "this")
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tokens.emplace_back(TOKEN(Keyword, This));
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else if (identifier == "while")
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tokens.emplace_back(TOKEN(Keyword, While));
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else if (identifier == "for")
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tokens.emplace_back(TOKEN(Keyword, For));
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else if (identifier == "fn")
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tokens.emplace_back(TOKEN(Keyword, Function));
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else if (identifier == "return")
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tokens.emplace_back(TOKEN(Keyword, Return));
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else if (identifier == "namespace")
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tokens.emplace_back(TOKEN(Keyword, Namespace));
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// Check for built-in types
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else if (identifier == "u8")
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tokens.emplace_back(TOKEN(ValueType, Unsigned8Bit));
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else if (identifier == "s8")
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tokens.emplace_back(TOKEN(ValueType, Signed8Bit));
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else if (identifier == "u16")
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tokens.emplace_back(TOKEN(ValueType, Unsigned16Bit));
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else if (identifier == "s16")
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tokens.emplace_back(TOKEN(ValueType, Signed16Bit));
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else if (identifier == "u32")
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tokens.emplace_back(TOKEN(ValueType, Unsigned32Bit));
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else if (identifier == "s32")
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tokens.emplace_back(TOKEN(ValueType, Signed32Bit));
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else if (identifier == "u64")
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tokens.emplace_back(TOKEN(ValueType, Unsigned64Bit));
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else if (identifier == "s64")
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tokens.emplace_back(TOKEN(ValueType, Signed64Bit));
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else if (identifier == "u128")
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tokens.emplace_back(TOKEN(ValueType, Unsigned128Bit));
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else if (identifier == "s128")
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tokens.emplace_back(TOKEN(ValueType, Signed128Bit));
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else if (identifier == "float")
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tokens.emplace_back(TOKEN(ValueType, Float));
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else if (identifier == "double")
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tokens.emplace_back(TOKEN(ValueType, Double));
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else if (identifier == "char")
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tokens.emplace_back(TOKEN(ValueType, Character));
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else if (identifier == "char16")
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tokens.emplace_back(TOKEN(ValueType, Character16));
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else if (identifier == "bool")
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tokens.emplace_back(TOKEN(ValueType, Boolean));
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else if (identifier == "str")
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tokens.emplace_back(TOKEN(ValueType, String));
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else if (identifier == "padding")
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tokens.emplace_back(TOKEN(ValueType, Padding));
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else if (identifier == "auto")
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tokens.emplace_back(TOKEN(ValueType, Auto));
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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.emplace_back(VALUE_TOKEN(Identifier, Token::Identifier(identifier)));
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offset += identifier.length();
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} else if (std::isdigit(c)) {
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auto integer = parseIntegerLiteral(&code[offset]);
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if (!integer.has_value())
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throwLexerError("invalid integer literal", lineNumber);
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tokens.emplace_back(VALUE_TOKEN(Integer, Token::Literal(integer.value())));
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offset += getIntegerLiteralLength(&code[offset]);
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} else
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throwLexerError("unknown token", lineNumber);
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}
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tokens.emplace_back(TOKEN(Separator, EndOfProgram));
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} catch (LexerError &e) {
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this->m_error = e;
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return { };
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}
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return tokens;
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}
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} |