#ifndef CCM_LEXER_H
#define CCM_LEXER_H

#include "commons.h"
#include "node.h"
#include "str.h"
#include "err.h"

typedef struct {
    ssize_t cursor;
    int line;
} lexer_state_t;

typedef struct {
    char const* repr;
    NodeKind kind;
} lexer_entry_t;

typedef struct {
    err_t err;
    str_t separators;
    char* source;
    ssize_t cursor;
    int line;
    vec_t texts;
} lexer_t;

void lexer_init(lexer_t* self);
void lexer_free(lexer_t* self);

void lexer_scan(lexer_t* self, char const* source);
void lexer_skip_spaces(lexer_t* self);
int lexer_is_sep(lexer_t* self, ssize_t pos);

void lexer_add_text(lexer_t* self, char const* repr, NodeKind kind);

node_t* lexer_peek(lexer_t* self, int lookahead);
int lexer_peek_kind(lexer_t* self, NodeKind kind, int lookahead);
lexer_state_t lexer_state(lexer_t* self);
void lexer_restore(lexer_t* self, lexer_state_t state);

node_t* lexer_try_new_next(lexer_t* self);
int lexer_consume_next(lexer_t* self, NodeKind kind);

node_t* lexer_try_new_keyword(lexer_t* self,
                              char const* keyword,
                              NodeKind kind,
                              int has_value);

node_t* lexer_try_new_text(lexer_t* self,
                           char const* text,
                           NodeKind kind,
                           int has_value);

node_t* lexer_try_new_num(lexer_t* self);
node_t* lexer_try_new_str(lexer_t* self);
#endif