llex.h 2.3 KB

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  1. /*
  2. ** $Id: llex.h,v 1.79.1.1 2017/04/19 17:20:42 roberto Exp $
  3. ** Lexical Analyzer
  4. ** See Copyright Notice in lua.h
  5. */
  6. #ifndef llex_h
  7. #define llex_h
  8. #include "lobject.h"
  9. #include "lzio.h"
  10. #define FIRST_RESERVED 257
  11. #if !defined(LUA_ENV)
  12. #define LUA_ENV "_ENV"
  13. #endif
  14. /*
  15. * WARNING: if you change the order of this enumeration,
  16. * grep "ORDER RESERVED"
  17. */
  18. enum RESERVED {
  19. /* terminal symbols denoted by reserved words */
  20. TK_AND = FIRST_RESERVED, TK_BREAK,
  21. TK_DO, TK_ELSE, TK_ELSEIF, TK_END, TK_FALSE, TK_FOR, TK_FUNCTION,
  22. TK_GOTO, TK_IF, TK_IN, TK_LOCAL, TK_NIL, TK_NOT, TK_OR, TK_REPEAT,
  23. TK_RETURN, TK_THEN, TK_TRUE, TK_UNTIL, TK_WHILE,
  24. /* other terminal symbols */
  25. TK_IDIV, TK_CONCAT, TK_DOTS, TK_EQ, TK_GE, TK_LE, TK_NE,
  26. TK_SHL, TK_SHR,
  27. TK_DBCOLON, TK_EOS,
  28. TK_FLT, TK_INT, TK_NAME, TK_STRING
  29. };
  30. /* number of reserved words */
  31. #define NUM_RESERVED (cast(int, TK_WHILE-FIRST_RESERVED+1))
  32. typedef union {
  33. lua_Number r;
  34. lua_Integer i;
  35. TString *ts;
  36. } SemInfo; /* semantics information */
  37. typedef struct Token {
  38. int token;
  39. SemInfo seminfo;
  40. } Token;
  41. /* state of the lexer plus state of the parser when shared by all
  42. functions */
  43. typedef struct LexState {
  44. int current; /* current character (charint) */
  45. int linenumber; /* input line counter */
  46. int lastline; /* line of last token 'consumed' */
  47. Token t; /* current token */
  48. Token lookahead; /* look ahead token */
  49. struct FuncState *fs; /* current function (parser) */
  50. struct lua_State *L;
  51. ZIO *z; /* input stream */
  52. Mbuffer *buff; /* buffer for tokens */
  53. Table *h; /* to avoid collection/reuse strings */
  54. struct Dyndata *dyd; /* dynamic structures used by the parser */
  55. TString *source; /* current source name */
  56. TString *envn; /* environment variable name */
  57. } LexState;
  58. LUAI_FUNC void luaX_init (lua_State *L);
  59. LUAI_FUNC const char *luaX_getstr (unsigned int i, int *extra);
  60. LUAI_FUNC void luaX_setinput (lua_State *L, LexState *ls, ZIO *z,
  61. TString *source, int firstchar);
  62. LUAI_FUNC TString *luaX_newstring (LexState *ls, const char *str, size_t l);
  63. LUAI_FUNC void luaX_next (LexState *ls);
  64. LUAI_FUNC int luaX_lookahead (LexState *ls);
  65. LUAI_FUNC l_noret luaX_syntaxerror (LexState *ls, const char *s);
  66. LUAI_FUNC const char *luaX_token2str (LexState *ls, int token);
  67. #endif