mirror of
https://github.com/lua/lua
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76 lines
1.9 KiB
C
76 lines
1.9 KiB
C
/*
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** $Id: llex.h,v 1.49 2003/10/20 12:24:34 roberto Exp roberto $
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** Lexical Analyzer
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** See Copyright Notice in lua.h
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*/
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#ifndef llex_h
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#define llex_h
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#include "lobject.h"
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#include "lzio.h"
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#define FIRST_RESERVED 257
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/* maximum length of a reserved word */
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#define TOKEN_LEN (sizeof("function")/sizeof(char))
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/*
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* WARNING: if you change the order of this enumeration,
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* grep "ORDER RESERVED"
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*/
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enum RESERVED {
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/* terminal symbols denoted by reserved words */
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TK_AND = FIRST_RESERVED, TK_BREAK,
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TK_DO, TK_ELSE, TK_ELSEIF, TK_END, TK_FALSE, TK_FOR, TK_FUNCTION,
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TK_IF, TK_IN, TK_LOCAL, TK_NIL, TK_NOT, TK_OR, TK_REPEAT,
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TK_RETURN, TK_THEN, TK_TRUE, TK_UNTIL, TK_WHILE,
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/* other terminal symbols */
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TK_NAME, TK_CONCAT, TK_DOTS, TK_EQ, TK_GE, TK_LE, TK_NE, TK_NUMBER,
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TK_STRING, TK_EOS
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};
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/* number of reserved words */
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#define NUM_RESERVED (cast(int, TK_WHILE-FIRST_RESERVED+1))
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typedef union {
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lua_Number r;
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TString *ts;
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} SemInfo; /* semantics information */
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typedef struct Token {
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int token;
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SemInfo seminfo;
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} Token;
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typedef struct LexState {
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int current; /* current character (charint) */
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int linenumber; /* input line counter */
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int lastline; /* line of last token `consumed' */
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Token t; /* current token */
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Token lookahead; /* look ahead token */
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struct FuncState *fs; /* `FuncState' is private to the parser */
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struct lua_State *L;
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ZIO *z; /* input stream */
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Mbuffer *buff; /* buffer for tokens */
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TString *source; /* current source name */
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int nestlevel; /* level of nested non-terminals */
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} LexState;
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void luaX_init (lua_State *L);
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void luaX_setinput (lua_State *L, LexState *LS, ZIO *z, TString *source);
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TString *luaX_newstring (LexState *LS, const char *str, size_t l);
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int luaX_lex (LexState *LS, SemInfo *seminfo);
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void luaX_lexerror (LexState *ls, const char *msg, int token);
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void luaX_syntaxerror (LexState *ls, const char *s);
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const char *luaX_token2str (LexState *ls, int token);
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#endif
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