mirror of
https://github.com/lua/lua
synced 2024-11-26 22:59:35 +03:00
63 lines
1.5 KiB
C
63 lines
1.5 KiB
C
/*
|
|
** $Id: llex.h,v 1.10 1998/07/24 18:02:38 roberto Exp roberto $
|
|
** Lexical Analyzer
|
|
** See Copyright Notice in lua.h
|
|
*/
|
|
|
|
#ifndef llex_h
|
|
#define llex_h
|
|
|
|
#include "lobject.h"
|
|
#include "lzio.h"
|
|
|
|
|
|
#define FIRST_RESERVED 260
|
|
|
|
/* maximum length of a reserved word (+1 for terminal 0) */
|
|
#define TOKEN_LEN 15
|
|
|
|
enum RESERVED {
|
|
/* terminal symbols denoted by reserved words */
|
|
AND = FIRST_RESERVED,
|
|
DO, ELSE, ELSEIF, END, FUNCTION, IF, LOCAL, NIL, NOT, OR,
|
|
REPEAT, RETURN, THEN, UNTIL, WHILE,
|
|
/* other terminal symbols */
|
|
NAME, CONC, DOTS, EQ, GE, LE, NE, NUMBER, STRING, EOS};
|
|
|
|
|
|
#define MAX_IFS 5
|
|
|
|
/* "ifstate" keeps the state of each nested $if the lexical is dealing with. */
|
|
|
|
struct ifState {
|
|
int elsepart; /* true if it's in the $else part */
|
|
int condition; /* true if $if condition is true */
|
|
int skip; /* true if part must be skipped */
|
|
};
|
|
|
|
|
|
typedef struct LexState {
|
|
int current; /* look ahead character */
|
|
int token; /* look ahead token */
|
|
struct FuncState *fs; /* 'FuncState' is private for the parser */
|
|
union {
|
|
real r;
|
|
TaggedString *ts;
|
|
} seminfo; /* semantics information */
|
|
struct zio *lex_z; /* input stream */
|
|
int linenumber; /* input line counter */
|
|
int iflevel; /* level of nested $if's (for lexical analysis) */
|
|
struct ifState ifstate[MAX_IFS];
|
|
} LexState;
|
|
|
|
|
|
void luaX_init (void);
|
|
void luaX_setinput (LexState *LS, ZIO *z);
|
|
int luaX_lex (LexState *LS);
|
|
void luaX_syntaxerror (LexState *ls, char *s, char *token);
|
|
void luaX_error (LexState *ls, char *s);
|
|
void luaX_token2str (int token, char *s);
|
|
|
|
|
|
#endif
|