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/*
** Lexical analyzer.
** Major parts taken verbatim from the Lua interpreter.
** Copyright (C) 1994-2008 Lua.org, PUC-Rio. See Copyright Notice in lua.h
*/
#ifndef _LJ_LEX_H
#define _LJ_LEX_H
#include <stdarg.h>
#include "lj_obj.h"
#include "lj_err.h"
/* Lua lexer tokens. */
#define TKDEF(_, __) \
_(and) _(break) _(do) _(else) _(elseif) _(end) _(false) \
_(for) _(function) _(if) _(in) _(local) _(nil) _(not) _(or) \
_(repeat) _(return) _(then) _(true) _(until) _(while) \
__(concat, ..) __(dots, ...) __(eq, ==) __(ge, >=) __(le, <=) __(ne, ~=) \
__(number, <number>) __(name, <name>) __(string, <string>) __(eof, <eof>)
enum {
TK_OFS = 256,
#define TKENUM1(name) TK_##name,
#define TKENUM2(name, sym) TK_##name,
TKDEF(TKENUM1, TKENUM2)
#undef TKENUM1
#undef TKENUM2
TK_RESERVED = TK_while - TK_OFS
};
typedef int LexToken;
/* Combined bytecode ins/line. Only used during bytecode generation. */
typedef struct BCInsLine {
BCIns ins; /* Bytecode instruction. */
BCLine line; /* Line number for this bytecode. */
} BCInsLine;
/* Info for local variables. Only used during bytecode generation. */
typedef struct VarInfo {
GCRef name; /* Local variable name. */
BCPos startpc; /* First point where the local variable is active. */
BCPos endpc; /* First point where the local variable is dead. */
} VarInfo;
/* Lua lexer state. */
typedef struct LexState {
struct FuncState *fs; /* Current FuncState. Defined in lj_parse.c. */
struct lua_State *L; /* Lua state. */
TValue tokenval; /* Current token value. */
TValue lookaheadval; /* Lookahead token value. */
int current; /* Current character (charint). */
LexToken token; /* Current token. */
LexToken lookahead; /* Lookahead token. */
MSize n; /* Bytes left in input buffer. */
const char *p; /* Current position in input buffer. */
SBuf sb; /* String buffer for tokens. */
lua_Reader rfunc; /* Reader callback. */
void *rdata; /* Reader callback data. */
BCLine linenumber; /* Input line counter. */
BCLine lastline; /* Line of last token. */
GCstr *chunkname; /* Current chunk name (interned string). */
const char *chunkarg; /* Chunk name argument. */
VarInfo *vstack; /* Stack for names and extents of local variables. */
MSize sizevstack; /* Size of variable stack. */
MSize vtop; /* Top of variable stack. */
BCInsLine *bcstack; /* Stack for bytecode instructions/line numbers. */
MSize sizebcstack; /* Size of bytecode stack. */
uint32_t level; /* Syntactical nesting level. */
} LexState;
LJ_FUNC int lj_lex_setup(lua_State *L, LexState *ls);
LJ_FUNC void lj_lex_cleanup(lua_State *L, LexState *ls);
LJ_FUNC void lj_lex_next(LexState *ls);
LJ_FUNC LexToken lj_lex_lookahead(LexState *ls);
LJ_FUNC const char *lj_lex_token2str(LexState *ls, LexToken token);
LJ_FUNC_NORET void lj_lex_error(LexState *ls, LexToken token, ErrMsg em, ...);
LJ_FUNC void lj_lex_init(lua_State *L);
#endif
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