#if !lexer_h
#define lexer_h 1
+#include <ctype.h>
#include "bool.h"
/* Returns nonzero if character CH may be the first character in an
int lex_id_match_len (const char *keyword_string, size_t keyword_len,
const char *token_string, size_t token_len);
int lex_id_match (const char *keyword_string, const char *token_string);
+int lex_id_to_token (const char *id, size_t len);
/* Weird token functions. */
int lex_look_ahead (void);