llex.h
上传用户:yisoukefu
上传日期:2020-08-09
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文件大小:2k
- /*
- ** $Id: llex.h,v 1.57 2005/12/07 15:43:05 roberto Exp $
- ** Lexical Analyzer
- ** See Copyright Notice in lua.h
- */
- #ifndef llex_h
- #define llex_h
- #include "lobject.h"
- #include "lzio.h"
- #define FIRST_RESERVED 257
- /* maximum length of a reserved word */
- #define TOKEN_LEN (sizeof("function")/sizeof(char))
- /*
- * WARNING: if you change the order of this enumeration,
- * grep "ORDER RESERVED"
- */
- enum RESERVED {
- /* terminal symbols denoted by reserved words */
- TK_AND = FIRST_RESERVED, TK_BREAK,
- TK_DO, TK_ELSE, TK_ELSEIF, TK_END, TK_FALSE, TK_FOR, TK_FUNCTION,
- TK_IF, TK_IN, TK_LOCAL, TK_NIL, TK_NOT, TK_OR, TK_REPEAT,
- TK_RETURN, TK_THEN, TK_TRUE, TK_UNTIL, TK_WHILE,
- /* other terminal symbols */
- TK_CONCAT, TK_DOTS, TK_EQ, TK_GE, TK_LE, TK_NE, TK_NUMBER,
- TK_NAME, TK_STRING, TK_EOS
- };
- /* number of reserved words */
- #define NUM_RESERVED (cast(int, TK_WHILE-FIRST_RESERVED+1))
- /* array with token `names' */
- LUAI_DATA const char *const luaX_tokens [];
- typedef union {
- lua_Number r;
- TString *ts;
- } SemInfo; /* semantics information */
- typedef struct Token {
- int token;
- SemInfo seminfo;
- } Token;
- typedef struct LexState {
- int current; /* current character (charint) */
- int linenumber; /* input line counter */
- int lastline; /* line of last token `consumed' */
- Token t; /* current token */
- Token lookahead; /* look ahead token */
- struct FuncState *fs; /* `FuncState' is private to the parser */
- struct lua_State *L;
- ZIO *z; /* input stream */
- Mbuffer *buff; /* buffer for tokens */
- TString *source; /* current source name */
- char decpoint; /* locale decimal point */
- } LexState;
- LUAI_FUNC void luaX_init (lua_State *L);
- LUAI_FUNC void luaX_setinput (lua_State *L, LexState *LS, ZIO *z,
- TString *source);
- LUAI_FUNC TString *luaX_newstring (LexState *LS, const char *str, size_t l);
- LUAI_FUNC void luaX_next (LexState *ls);
- LUAI_FUNC void luaX_lookahead (LexState *ls);
- LUAI_FUNC void luaX_lexerror (LexState *ls, const char *msg, int token);
- LUAI_FUNC void luaX_syntaxerror (LexState *ls, const char *s);
- LUAI_FUNC const char *luaX_token2str (LexState *ls, int token);
- #endif