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Pawel Kolodziejski
59 lines
1.5 KiB
C
59 lines
1.5 KiB
C
/*
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** $Id$
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** Lexical Analizer
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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 "engine/lua/lobject.h"
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#include "engine/lua/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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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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};
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#define MAX_IFS 5
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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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int32 elsepart; // true if its in the $else part
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int32 condition; // true if $if condition is true
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int32 skip; // true if part must be skipped
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};
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typedef struct LexState {
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int32 current; // look ahead character
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int32 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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zio *lex_z; // input stream
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int32 linenumber; // input line counter
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int32 iflevel; // level of nested $if's (for lexical analysis)
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ifState ifstate[MAX_IFS];
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} LexState;
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void luaX_init();
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void luaX_setinput(LexState *LS, ZIO *z);
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int32 luaX_lex(LexState *LS);
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void luaX_syntaxerror(LexState *ls, const char *s, const char *token);
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void luaX_error(LexState *ls, const char *s);
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void luaX_token2str(LexState *ls, int32 token, char *s);
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#endif
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