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1866
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1 /*
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2 ** $Id: llex.h,v 1.72 2011/11/30 12:43:51 roberto Exp $
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3 ** Lexical Analyzer
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4 ** See Copyright Notice in lua.h
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5 */
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6
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7 #ifndef llex_h
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8 #define llex_h
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9
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10 #include "lobject.h"
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11 #include "lzio.h"
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12
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13
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14 #define FIRST_RESERVED 257
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15
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16
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17
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18 /*
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19 * WARNING: if you change the order of this enumeration,
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20 * grep "ORDER RESERVED"
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21 */
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22 enum RESERVED {
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23 /* terminal symbols denoted by reserved words */
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24 TK_AND = FIRST_RESERVED, TK_BREAK,
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25 TK_DO, TK_ELSE, TK_ELSEIF, TK_END, TK_FALSE, TK_FOR, TK_FUNCTION,
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26 TK_GOTO, TK_IF, TK_IN, TK_LOCAL, TK_NIL, TK_NOT, TK_OR, TK_REPEAT,
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27 TK_RETURN, TK_THEN, TK_TRUE, TK_UNTIL, TK_WHILE,
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28 /* other terminal symbols */
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29 TK_CONCAT, TK_DOTS, TK_EQ, TK_GE, TK_LE, TK_NE, TK_DBCOLON, TK_EOS,
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30 TK_NUMBER, TK_NAME, TK_STRING
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31 };
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32
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33 /* number of reserved words */
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34 #define NUM_RESERVED (cast(int, TK_WHILE-FIRST_RESERVED+1))
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35
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36
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37 typedef union {
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38 lua_Number r;
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39 TString *ts;
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40 } SemInfo; /* semantics information */
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41
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42
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43 typedef struct Token {
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44 int token;
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45 SemInfo seminfo;
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46 } Token;
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47
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48
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49 /* state of the lexer plus state of the parser when shared by all
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50 functions */
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51 typedef struct LexState {
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52 int current; /* current character (charint) */
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53 int linenumber; /* input line counter */
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54 int lastline; /* line of last token `consumed' */
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55 Token t; /* current token */
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56 Token lookahead; /* look ahead token */
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57 struct FuncState *fs; /* current function (parser) */
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58 struct lua_State *L;
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59 ZIO *z; /* input stream */
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60 Mbuffer *buff; /* buffer for tokens */
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61 struct Dyndata *dyd; /* dynamic structures used by the parser */
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62 TString *source; /* current source name */
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63 TString *envn; /* environment variable name */
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64 char decpoint; /* locale decimal point */
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65 } LexState;
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66
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67
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68 LUAI_FUNC void luaX_init (lua_State *L);
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69 LUAI_FUNC void luaX_setinput (lua_State *L, LexState *ls, ZIO *z,
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70 TString *source, int firstchar);
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71 LUAI_FUNC TString *luaX_newstring (LexState *ls, const char *str, size_t l);
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72 LUAI_FUNC void luaX_next (LexState *ls);
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73 LUAI_FUNC int luaX_lookahead (LexState *ls);
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74 LUAI_FUNC l_noret luaX_syntaxerror (LexState *ls, const char *s);
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75 LUAI_FUNC const char *luaX_token2str (LexState *ls, int token);
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76
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77
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78 #endif
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