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Implementing a Domain-Specific Language (DSL) with LLVM and C++

Tutorial February 12, 2025

Header: Lexer.h

#ifndef DSL_LEXER_H
#define DSL_LEXER_H

#include <string>
#include <vector>

enum class TokenType {
    Number,
    Plus,
    Minus,
    Asterisk,
    Slash,
    LParen,
    RParen,
    EndOfFile,
    Invalid
};

struct Token {
    TokenType type;
    std::string text;
    double value; // Only valid for Number tokens.
};

class Lexer {
public:
    Lexer(const std::string& input);
    Token getNextToken();

private:
    const std::string input;
    size_t pos = 0;
    char currentChar();

    void advance();
    void skipWhitespace();
    Token number();
};

#endif // DSL_LEXER_H

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