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Cleaned up Lexer

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Pasha Bibko
2025-05-07 18:10:15 +01:00
parent 6783564f10
commit 98fc4589ab
11 changed files with 246 additions and 203 deletions
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260
Lexer/src/Lexer.cpp
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@@ -4,174 +4,67 @@
#include <LexerErrors.h>
#include <LexerInfo.h>
#include <Constants.h>
namespace LX
{
InvalidCharInSource::InvalidCharInSource(const LexerInfo& info, const std::string& source, const std::string _file)
: col(info.column), line(info.line), file(_file), lineContents{}, invalid(source[info.index])
{
// Gets the line the error is on //
lineContents = GetLineAtIndexOf(source, info.index);
}
void InvalidCharInSource::PrintToConsole() const
{
// Calculates the length of the line number in the console so it is formatted correctly //
std::ostringstream oss;
oss << std::setw(3) << line;
size_t lineNumberWidthInConsole = std::max(oss.str().size(), (size_t)3);
// Prints the error with the relevant information to the console //
std::cout << "\n";
LX::PrintStringAsColor("Error: ", LX::Color::LIGHT_RED);
std::cout << "Invalid character found in ";
LX::PrintStringAsColor(file, LX::Color::WHITE);
std::cout << " {";
LX::PrintStringAsColor(std::string(1, invalid), LX::Color::LIGHT_RED);
std::cout << "}:\n";
std::cout << "Line: " << std::setw(lineNumberWidthInConsole) << line << " | " << lineContents << "\n";
std::cout << " " << std::setw(lineNumberWidthInConsole) << "" << " | " << std::setw(col - 1) << "";
LX::PrintStringAsColor("^", LX::Color::LIGHT_RED);
std::cout << "\n";
}
const char* InvalidCharInSource::ErrorType() const
{
return "Invalid char in source";
}
// Helper macro for outputting token type //
#define TOKEN_CASE(type) case type: return #type;
// Helper util function to translate a tokentype to it's enum val //
static std::string ToStringNoFormat(Token::TokenType type)
{
switch (type)
{
TOKEN_CASE(Token::STRING_LITERAL);
TOKEN_CASE(Token::IDENTIFIER);
TOKEN_CASE(Token::FOR);
TOKEN_CASE(Token::WHILE);
TOKEN_CASE(Token::IF);
TOKEN_CASE(Token::ELSE);
TOKEN_CASE(Token::ELIF);
TOKEN_CASE(Token::FUNCTION);
TOKEN_CASE(Token::ADD);
TOKEN_CASE(Token::SUB);
TOKEN_CASE(Token::MUL);
TOKEN_CASE(Token::DIV);
TOKEN_CASE(Token::NUMBER_LITERAL);
TOKEN_CASE(Token::RETURN);
TOKEN_CASE(Token::OPEN_BRACE);
TOKEN_CASE(Token::CLOSE_BRACE);
TOKEN_CASE(Token::OPEN_BRACKET);
TOKEN_CASE(Token::CLOSE_BRACKET);
TOKEN_CASE(Token::OPEN_PAREN);
TOKEN_CASE(Token::CLOSE_PAREN);
TOKEN_CASE(Token::ASSIGN);
TOKEN_CASE(Token::INT_DEC);
default:
return "Unknown: " + std::to_string(type);
}
}
// Logging function to turn a tokentype enum val into a nicely formatted string //
std::string ToString(Token::TokenType type)
{
// Gets the unformated version of the string //
std::string unformatted = ToStringNoFormat(type);
unformatted = unformatted.substr(7); // Removes the Token:: prefix
// Formats the string (turns to lowercase and replaces _ with a space //
std::string formatted;
for (char current : unformatted)
{
// Adding 32 makes it lowercase due to how ASCII works //
if ((current >= 'A' && current <= 'Z')) { formatted.push_back(current + 32); }
// Replaces _ with spaces //
else if (current == '_') { formatted.push_back(' '); }
// Else adds the current character //
else { formatted.push_back(current); }
}
// Returns the formatted string //
return formatted;
}
// Stops use outside of the function //
#undef TOKEN_CASE
// Helper function for dealing with floating-point number literals //
static constexpr bool CanBePartOfNumberLiteral(const char c) { return (c == '.') || (c == 'f'); }
// Helper function to stop printing whitespace as pure whitespace //
static std::string PrintChar(const char c)
{
switch (c)
{
// Stores them as pure string literals //
case '\n': return R"(\n)";
case '\t': return R"(\t)";
case '\r': return R"(\r)";
// Else returns a string of length one with the char inside //
default: return std::string(1, c);
}
}
// All the keywords the lexer currently supports with their token-enum equivalents //
static const std::unordered_map<std::string, Token::TokenType> keywords =
{
{ "for" , Token::FOR },
{ "while" , Token::WHILE },
{ "if" , Token::IF },
{ "else" , Token::ELSE },
{ "elif" , Token::ELIF },
{ "func" , Token::FUNCTION },
{ "return" , Token::RETURN },
{ "int" , Token::INT_DEC }
};
// All the symbols supported by the lexer //
static const std::unordered_map<char, Token::TokenType> symbols =
{
{ '{', Token::OPEN_BRACKET },
{ '}', Token::CLOSE_BRACKET },
{ '[', Token::OPEN_BRACE },
{ ']', Token::CLOSE_BRACE },
{ '(', Token::OPEN_PAREN },
{ ')', Token::CLOSE_PAREN },
{ ',', Token::COMMA },
{ '=', Token::ASSIGN }
};
// All the single-char operators currently supported by the lexer with their token-enum equivalents //
// TODO: Support multi-char operators such as: ==, -> +=, &&
static const std::unordered_map<char, Token::TokenType> operators =
{
{ '+', Token::ADD },
{ '-', Token::SUB },
{ '*', Token::MUL },
{ '/', Token::DIV }
};
// Checks if the given word is a keyword before adding it to the tokens //
static void TokenizeWord(const std::string& word, std::vector<Token>& tokens, LexerInfo& info, const std::string& contents)
static void TokenizeWord(const std::string& word, std::vector<Token>& tokens, LexerInfo& info)
{
// Checks the map for a check and if so adds it with its enum equivalent //
if (auto keyword = keywords.find(word); keyword != keywords.end())
{
tokens.push_back({ keyword->second, info, (std::streamsize)word.size(), contents });
tokens.push_back({ keyword->second, info, (std::streamsize)word.size(), info.source });
}
// Else adds it as a type of IDENTIFIER //
else
{
tokens.push_back({ Token::IDENTIFIER, info, (std::streamsize)word.size(), contents });
tokens.push_back({ Token::IDENTIFIER, info, (std::streamsize)word.size(), info.source });
}
}
static inline void UpdateLexerInfo(LexerInfo& info)
{
// Transfers the previous state if not at the beginning //
if (info.index != 0) [[likely]]
{
info.wasLastCharAlpha = info.isAlpha;
info.wasLastCharNumeric = info.isNumeric;
info.isAlpha = info.isNextCharAlpha;
info.isNumeric = info.isNextCharNumeric;
}
else
{
// Stores the current character for easy access
const char current = info.source[info.index];
// Works out if the current character is alphabetic or numeric //
info.isAlpha = (current >= 'a' && current <= 'z') || (current >= 'A' && current <= 'Z');
info.isNumeric = (current >= '0' && current <= '9');
}
// Only does next character checks when not at the end //
if (info.index + 1 < info.len) [[likely]]
{
// Gets the next character //
const char next = info.source[info.index + 1];
// Sets flags depending on the value of the next character //
info.isNextCharAlpha = (next >= 'a' && next <= 'z') || (next >= 'A' && next <= 'Z');
info.isNextCharNumeric = (next >= '0' && next <= '9') || CanBePartOfNumberLiteral(next);
}
// Else defaults the flags to false //
else
{
info.isNextCharAlpha = false;
info.isNextCharNumeric = false;
}
}
@@ -180,8 +73,8 @@ namespace LX
// Logs that the file is being read //
Log::LogNewSection("Reading file: ", path.string());
std::string contents = ReadFileToString(path);
const std::streamsize len = contents.length();
std::string fileContents = ReadFileToString(path);
const std::streamsize len = fileContents.length();
// Logs the start of the lexical analysis
Log::LogNewSection("Lexing file");
@@ -192,36 +85,16 @@ namespace LX
tokens.reserve(0xFFFF);
// Trackers for when the program is iterating over the file //
LexerInfo info;
LexerInfo info(fileContents);
// Iterates over the file and turns it into tokens //
while (info.index < len)
{
// Stores the current character for easy access
const char current = contents[info.index];
const char current = info.source[info.index];
// Checks if it is not at end //
// Predicts it is not at end for microptimsation //
if (info.index + 1 < len) [[likely]]
{
// Gets the next character //
const char next = contents[info.index + 1];
// Sets flags depending on the value of the next character //
info.isNextCharAlpha = (next >= 'a' && next <= 'z') || (next >= 'A' && next <= 'Z');
info.isNextCharNumeric = (next >= '0' && next <= '9') || CanBePartOfNumberLiteral(next);
}
else
{
// Else defaults the next character's flags to false //
info.isNextCharAlpha = false;
info.isNextCharNumeric = false;
}
// Works out if the current character is alphabetic or numeric //
info.isAlpha = (current >= 'a' && current <= 'z') || (current >= 'A' && current <= 'Z');
info.isNumeric = (current >= '0' && current <= '9');
// Updates the LexerInfo //
UpdateLexerInfo(info);
// Updates string literal tracker and skips over rest if in a string literal //
if (current == '"')
@@ -238,8 +111,8 @@ namespace LX
else
{
// Adds the string literal token to the token vector //
std::string lit(contents.data() + info.startOfStringLiteral, info.index - info.startOfStringLiteral);
tokens.push_back({ Token::STRING_LITERAL, info, (std::streamsize)lit.length() + 2, contents }); // Adding two makes the "" be stored as well
std::string lit(info.source.data() + info.startOfStringLiteral, info.index - info.startOfStringLiteral);
tokens.push_back({ Token::STRING_LITERAL, info, (std::streamsize)lit.length() + 2, info.source }); // Adding two makes the "" be stored as well
// Updates trackers //
info.inStringLiteral = false;
@@ -268,8 +141,8 @@ namespace LX
if (info.isNextCharNumeric == false)
{
// Pushes the number to the token vector. Number literals are stored as string in the tokens //
std::string num(contents.data() + info.startOfNumberLiteral, (unsigned __int64)(info.index + 1) - info.startOfNumberLiteral);
tokens.push_back({ Token::NUMBER_LITERAL, info, (std::streamsize)num.size(), contents });
std::string num(info.source.data() + info.startOfNumberLiteral, (unsigned __int64)(info.index + 1) - info.startOfNumberLiteral);
tokens.push_back({ Token::NUMBER_LITERAL, info, (std::streamsize)num.size(), info.source });
}
// Stores it is lexing a number literal //
@@ -280,8 +153,8 @@ namespace LX
else if ((info.isNumeric == true || CanBePartOfNumberLiteral(current)) && info.isNextCharNumeric == false && info.lexingNumber == true)
{
// Pushes the number to the token vector. Number literals are stored as string in the tokens //
std::string num(contents.data() + info.startOfNumberLiteral, (unsigned __int64)(info.index + 1) - info.startOfNumberLiteral);
tokens.push_back({ Token::NUMBER_LITERAL, info, (std::streamsize)num.size(), contents });
std::string num(info.source.data() + info.startOfNumberLiteral, (unsigned __int64)(info.index + 1) - info.startOfNumberLiteral);
tokens.push_back({ Token::NUMBER_LITERAL, info, (std::streamsize)num.size(), info.source });
info.lexingNumber = false; // Stops storing it is lexing a number
}
@@ -299,7 +172,7 @@ namespace LX
if (info.isNextCharAlpha == false)
{
// Calls the function designed to handle the tokenisation of words //
TokenizeWord({ contents.data() + info.startOfWord, 1 }, tokens, info, contents);
TokenizeWord({ info.source.data() + info.startOfWord, 1 }, tokens, info);
}
}
@@ -307,7 +180,7 @@ namespace LX
else if (info.isAlpha == true && info.isNextCharAlpha == false)
{
// Calls the function designed to handle the tokenisation of words //
TokenizeWord({ contents.data() + info.startOfWord, (unsigned __int64)((info.index + 1) - info.startOfWord) }, tokens, info, contents);
TokenizeWord({ info.source.data() + info.startOfWord, (unsigned __int64)((info.index + 1) - info.startOfWord) }, tokens, info);
}
// During a word //
@@ -316,13 +189,13 @@ namespace LX
// Symbols //
else if (auto sym = symbols.find(current); sym != symbols.end())
{
tokens.push_back({ sym->second, info, 1, contents });
tokens.push_back({ sym->second, info, 1, info.source });
}
// Operators (+, -, /, *) //
else if (auto op = operators.find(current); op != operators.end())
{
tokens.push_back({ op->second, info, 1, contents });
tokens.push_back({ op->second, info, 1, info.source });
}
// If it is here and not whitespace that means it's an invalid character //
@@ -345,7 +218,7 @@ namespace LX
// Throws an error with all the relevant information //
else
{
ThrowIf<InvalidCharInSource>(true, info, contents, path.string());
ThrowIf<InvalidCharInSource>(true, info, path.string());
}
// Log dumps A LOT of info //
@@ -361,16 +234,13 @@ namespace LX
" Next Char Numeric: ", info.wasLastCharNumeric,
" Last Char Numeric: ", info.wasLastCharAlpha,
" Lexing number: ", info.lexingNumber,
" Current: {", PrintChar(current), "}"
" Current: {", CharAsStrLit(current), "}"
);
// Updates trackers to their default state of a new character //
// Updates the indecies to the next character //
info.index++;
info.column++;
info.wasLastCharAlpha = info.isAlpha;
info.wasLastCharNumeric = info.isNumeric;
}
Log::out("\n"); // Puts a space to clean up the log
@@ -383,7 +253,7 @@ namespace LX
"{ Line: ", std::setw(3), token.line,
", Index: ", std::setw(3), token.index,
", Length: ", std::setw(2), token.length, " } ",
std::setw(30), ToStringNoFormat(token.type) + ":", "{", token.GetContents(), "}"
std::setw(30), ToString(token.type) + ":", "{", token.GetContents(), "}"
);
}