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/* Copyright (c) 2024 Freya Murphy */
#ifndef __LEX_H__
#define __LEX_H__
#include <mlimits.h>
#include <stdio.h>
#include <stdint.h>
struct lexer {
FILE *file;
int peek;
int x;
int y;
};
struct lexer_state {
long offset;
int peek;
int x;
int y;
};
enum token_type {
TOK_IDENT,
TOK_REG,
TOK_LABEL,
TOK_STRING,
TOK_COMMA,
TOK_EQUAL,
TOK_LPAREN,
TOK_RPAREN,
TOK_NUMBER,
TOK_EOF,
TOK_NL,
TOK_DIRECTIVE,
};
struct token {
enum token_type type;
union {
int64_t number;
char text[MAX_LEX_LENGTH];
};
int x;
int y;
};
/* initalize a lexer */
int lexer_init(const char *file, struct lexer *lexer);
/* free the lxer */
int lexer_free(struct lexer *lexer);
/* lexes the next token, returns M_ERROR on error,
* and TOK_EOF on EOF */
int lexer_next(struct lexer *lexer, struct token *token);
/* token type to string */
char *token_str(enum token_type);
/* save the state of a lexer */
void lexer_save(struct lexer *lexer, struct lexer_state *state);
/* load a different state into a lexer */
void lexer_load(struct lexer *lexer, const struct lexer_state *state);
#endif /* __LEX_H__ */
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