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https://github.com/lua/lua
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70 lines
1.7 KiB
C
70 lines
1.7 KiB
C
/*
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** $Id: llex.h,v 1.12 1999/06/17 17:04:03 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 260
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/* maximum length of a reserved word (+1 for terminal 0) */
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#define TOKEN_LEN 15
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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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AND = FIRST_RESERVED,
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DO, ELSE, ELSEIF, END, FUNCTION, IF, LOCAL, NIL, NOT, OR,
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REPEAT, RETURN, THEN, UNTIL, WHILE,
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/* other terminal symbols */
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NAME, CONC, DOTS, EQ, GE, LE, NE, NUMBER, STRING, EOS};
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#ifndef MAX_IFS
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#define MAX_IFS 5 /* arbitrary limit */
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#endif
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/* "ifstate" keeps the state of each nested $if the lexical is dealing with. */
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struct ifState {
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int elsepart; /* true if it's in the $else part */
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int condition; /* true if $if condition is true */
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int skip; /* true if part must be skipped */
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};
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typedef struct LexState {
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int current; /* look ahead character */
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int token; /* look ahead token */
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struct FuncState *fs; /* 'FuncState' is private for the parser */
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union {
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real r;
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TaggedString *ts;
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} seminfo; /* semantics information */
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struct zio *lex_z; /* input stream */
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int linenumber; /* input line counter */
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int iflevel; /* level of nested $if's (for lexical analysis) */
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struct ifState ifstate[MAX_IFS];
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} LexState;
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void luaX_init (void);
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void luaX_setinput (LexState *LS, ZIO *z);
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int luaX_lex (LexState *LS);
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void luaX_syntaxerror (LexState *ls, char *s, char *token);
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void luaX_error (LexState *ls, char *s);
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void luaX_token2str (int token, char *s);
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#endif
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