lesson-lisp/src/lexer.h

#ifndef __ARCANA_LISP_LEXER_H__
#define __ARCANA_LISP_LEXER_H__

#include "tokens.h"

#include <stddef.h>

#define LEXER_BUFFER_SLEN 1023
#define LEXER_BUFFER_SIZE (LEXER_BUFFER_SLEN + 1)

#define LEXER_DELETE(lexer) do { \
    Lexer_delete(lexer);         \
    lexer = NULL;                \
} while (0)

enum Lexer_State {
    STATE_INIT,
    STATE_WHITESPACE,
    STATE_COMMENT_LINE,
    STATE_ROUND_OPEN,
    STATE_ROUND_CLOSE,
    STATE_SQUARE_OPEN,
    STATE_SQUARE_CLOSE,
    STATE_CURLY_OPEN,
    STATE_CURLY_CLOSE,
    STATE_QUOTE,
    STATE_QUASI_QUOTE,
    STATE_QUASI_UNQUOTE,
    STATE_SHARP,
    STATE_TAG,
    STATE_IDENT,
    STATE_NUM,
    STATE_STRING_START,
    STATE_STRING_INSIDE,
    STATE_STRING_END,
    STATE_STRING_ESCAPE,
};

typedef struct Lexer {
    Tokens tokens;
    enum Lexer_State state;
    char buffer[LEXER_BUFFER_SIZE];
    size_t buffer_index;
} *Lexer;

Lexer Lexer_new(Tokens tokens);
void Lexer_delete(Lexer lexer);

void Lexer_lex(Lexer self, char chr);

#endif