forked from mia/Aegisub
85 lines
3 KiB
C
85 lines
3 KiB
C
/*
|
|
** Lexical analyzer.
|
|
** Copyright (C) 2005-2014 Mike Pall. See Copyright Notice in luajit.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) _(goto) _(if) _(in) _(local) _(nil) _(not) _(or) \
|
|
_(repeat) _(return) _(then) _(true) _(until) _(while) \
|
|
__(concat, ..) __(dots, ...) __(eq, ==) __(ge, >=) __(le, <=) __(ne, ~=) \
|
|
__(label, ::) __(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 or goto/label name. */
|
|
BCPos startpc; /* First point where the local variable is active. */
|
|
BCPos endpc; /* First point where the local variable is dead. */
|
|
uint8_t slot; /* Variable slot. */
|
|
uint8_t info; /* Variable/goto/label info. */
|
|
} 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. */
|
|
const char *mode; /* Allow loading bytecode (b) and/or source text (t). */
|
|
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
|