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4680 | right-hear | 1 | /* |
2 | ** $Id: llex.h,v 1.65 2010/04/05 16:35:37 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 | |||
7 | #ifndef llex_h |
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8 | #define llex_h |
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9 | |||
10 | #include "lobject.h" |
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11 | #include "lzio.h" |
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12 | |||
13 | |||
14 | #define FIRST_RESERVED 257 |
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15 | |||
16 | /* maximum length of a reserved word */ |
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17 | #define TOKEN_LEN (sizeof("function")/sizeof(char)) |
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18 | |||
19 | |||
20 | /* |
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21 | * WARNING: if you change the order of this enumeration, |
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22 | * grep "ORDER RESERVED" |
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23 | */ |
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24 | enum RESERVED { |
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25 | /* terminal symbols denoted by reserved words */ |
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26 | TK_AND = FIRST_RESERVED, TK_BREAK, |
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27 | TK_DO, TK_ELSE, TK_ELSEIF, TK_END, TK_FALSE, TK_FOR, TK_FUNCTION, |
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28 | TK_IF, TK_IN, TK_LOCAL, TK_NIL, TK_NOT, TK_OR, TK_REPEAT, |
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29 | TK_RETURN, TK_THEN, TK_TRUE, TK_UNTIL, TK_WHILE, |
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30 | /* other terminal symbols */ |
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31 | TK_CONCAT, TK_DOTS, TK_EQ, TK_GE, TK_LE, TK_NE, TK_EOS, |
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32 | TK_NUMBER, TK_NAME, TK_STRING |
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33 | }; |
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34 | |||
35 | /* number of reserved words */ |
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36 | #define NUM_RESERVED (cast(int, TK_WHILE-FIRST_RESERVED+1)) |
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37 | |||
38 | |||
39 | typedef union { |
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40 | lua_Number r; |
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41 | TString *ts; |
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42 | } SemInfo; /* semantics information */ |
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43 | |||
44 | |||
45 | typedef struct Token { |
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46 | int token; |
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47 | SemInfo seminfo; |
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48 | } Token; |
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49 | |||
50 | |||
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; /* `FuncState' is private to the 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 Varlist *varl; /* list of all active local variables */ |
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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 | |||
67 | |||
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); |
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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 void 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 | |||
77 | |||
78 | #endif |