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#ifndef LEXER_H
#define LEXER_H
#include "util.h"
#include "syntax.h"
#include "token.h"
/* The Lexer. */
typedef struct LEXER_STRUC {
/* Source being read. */
char* src;
/* What the lexer is looking at right now. */
enum LEXER_STATE {
/* Normal 1-character token. */
LEXER_STATE_REG,
/* Definition tag. */
LEXER_STATE_TAG,
/* String. */
LEXER_STATE_STR,
/* Escaped character in string. */
LEXER_STATE_STR_ESC,
/* Integer. */
LEXER_STATE_INT,
/* Keyword. */
LEXER_STATE_KWD,
} state;
/* The linked list of tokens generated. */
token_t* tokenl;
/* Pointer to the last token in tokenl. */
token_t* tokenl_last;
/* Number of tokens in tokenl. */
int tokenc;
} lexer_t;
/* Create lexer from source. */
lexer_t* lexer_init (char* src);
/*
Destroy a lexer.
- Does not free `src.
- Does not free `tokenl`.
*/
void lexer_destroy (lexer_t* lexer);
/* Add token to tokenl. */
void lexer_add_token(lexer_t* lexer, token_t* token);
/* Add the current character as a token to tokenl. Utility function `for lexer_do_reg()`. */
void lexer_add_current_char(lexer_t* lexer, int type);
/*
Add first character of given lexer's `src` to the value of the last token in `tokenl`, if it exists.
Otherwise, create new token and add it.
*/
void lexer_add_current_char_to_last_token(lexer_t* lexer, int type);
/* Handle regular state. */
void lexer_do_reg(lexer_t* lexer);
/* Handle definition tag. state*/
void lexer_do_tag(lexer_t* lexer);
/* TODO: handle character state. */
void lexer_do_chr(lexer_t* lexer);
/* Handle string state. */
void lexer_do_str(lexer_t* lexer);
/* Handle integer. */
void lexer_do_int(lexer_t* lexer);
/* Handle keywords. */
void lexer_do_kwd(lexer_t* lexer);
/* Run lexer. */
void lexer_run(lexer_t* lexer);
#endif
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