#ifndef LEX_H
#define LEX_H

#include "sv.h"

#include <stddef.h>

#define TOKEN_EOF (struct token){						\
		.type = T_EOF,							\
		.me = (struct string_view){.buf = NULL, .len = 0}		\
	}

#define TOKEN_EQUAL_SIGN (struct token){					\
		.type = T_EQUAL_SIGN,						\
		.me = (struct string_view){.buf = "=", .len = 1}	        \
	}

#define TOKEN_SEMICOLON (struct token){					\
		.type = T_SEMICOL,						\
		.me = (struct string_view){.buf = ";", .len = 1}	        \
	}

#define TOKEN_SCOPE_START (struct token){					\
		.type = T_SCOPESTART,						\
		.me = (struct string_view){.buf = "{", .len = 1}	        \
	}

#define TOKEN_SCOPE_END (struct token){						\
		.type = T_SCOPEEND,						\
		.me = (struct string_view){.buf = "}", .len = 1}	        \
	}

#define T_TYPE (uint64_t)0xFF000000

#define T_ERR (uint32_t)0
#define T_ID (uint32_t)1
#define T_STRING (uint32_t)2
#define T_SEMICOL (uint32_t)3
#define T_NUMBER (uint32_t)4
#define T_EQUAL_SIGN (uint32_t)5
#define T_SCOPESTART (uint32_t)6
#define T_SCOPEEND (uint32_t)7
#define T_TYPE_G64 (uint64_t)T_TYPE | (uint32_t)8
#define T_TYPE_G32 (uint64_t)T_TYPE | (uint32_t)9
#define T_TYPE_G16 (uint64_t)T_TYPE | (uint32_t)10
#define T_TYPE_G8 (uint64_t)T_TYPE | (uint32_t)11
#define T_EOF (uint32_t)12

struct token {
	uint64_t type;
	struct string_view me;       
};

struct lex_config {
	char *src;
	struct string_pool *sp;
	size_t size;
	size_t pos;
};

int lex_keyword_lookup(struct string_view sv, uint64_t *res);
int lex_is_char(char c);
int lex_is_digit(char c);
int lex_within_bounds(struct lex_config *lc);
int lex_within_obounds(struct lex_config *lc, size_t o);
char lex_peek(struct lex_config *lc, size_t o);
char lex_advance(struct lex_config *lc);
int lex_is_space(char c);
void lex_skip_whitespace(struct lex_config *lc);
struct token lex_word(struct lex_config *lc);
struct token lex_number(struct lex_config *lc);
struct token lex_opcode(struct lex_config *lc);

struct token lex_next(struct lex_config *lc);      

#endif