📄 lapi.c
字号:
/*** $Id: lapi.c,v 1.2 2007/04/20 13:46:03 bernd67 Exp $** Lua API** See Copyright Notice in lua.h*/#include <assert.h>#include <string.h>#define lapi_c#include "lua.h"#include "lapi.h"#include "ldebug.h"#include "ldo.h"#include "lfunc.h"#include "lgc.h"#include "lmem.h"#include "lobject.h"#include "lstate.h"#include "lstring.h"#include "ltable.h"#include "ltm.h"#include "lundump.h"#include "lvm.h"const char lua_ident[] = "$Lua: " LUA_VERSION " " LUA_COPYRIGHT " $\n" "$Authors: " LUA_AUTHORS " $\n" "$URL: www.lua.org $\n";#ifndef api_check#define api_check(L, o) /*{ assert(o); }*/#endif#define api_checknelems(L, n) api_check(L, (n) <= (L->top - L->base))#define api_incr_top(L) {api_check(L, L->top < L->ci->top); L->top++;}static TObject *negindex (lua_State *L, int idx) { if (idx > LUA_REGISTRYINDEX) { api_check(L, idx != 0 && -idx <= L->top - L->base); return L->top+idx; } else switch (idx) { /* pseudo-indices */ case LUA_REGISTRYINDEX: return registry(L); case LUA_GLOBALSINDEX: return gt(L); default: { TObject *func = (L->base - 1); idx = LUA_GLOBALSINDEX - idx; lua_assert(iscfunction(func)); return (idx <= clvalue(func)->c.nupvalues) ? &clvalue(func)->c.upvalue[idx-1] : NULL; } }}static TObject *luaA_index (lua_State *L, int idx) { if (idx > 0) { api_check(L, idx <= L->top - L->base); return L->base + idx - 1; } else { TObject *o = negindex(L, idx); api_check(L, o != NULL); return o; }}static TObject *luaA_indexAcceptable (lua_State *L, int idx) { if (idx > 0) { TObject *o = L->base+(idx-1); api_check(L, idx <= L->stack_last - L->base); if (o >= L->top) return NULL; else return o; } else return negindex(L, idx);}void luaA_pushobject (lua_State *L, const TObject *o) { setobj2s(L->top, o); incr_top(L);}LUA_API int lua_checkstack (lua_State *L, int size) { int res; lua_lock(L); if ((L->top - L->base + size) > LUA_MAXCSTACK) res = 0; /* stack overflow */ else { luaD_checkstack(L, size); if (L->ci->top < L->top + size) L->ci->top = L->top + size; res = 1; } lua_unlock(L); return res;}LUA_API void lua_xmove (lua_State *from, lua_State *to, int n) { int i; lua_lock(to); api_checknelems(from, n); from->top -= n; for (i = 0; i < n; i++) { setobj2s(to->top, from->top + i); api_incr_top(to); } lua_unlock(to);}LUA_API lua_CFunction lua_atpanic (lua_State *L, lua_CFunction panicf) { lua_CFunction old; lua_lock(L); old = G(L)->panic; G(L)->panic = panicf; lua_unlock(L); return old;}LUA_API lua_State *lua_newthread (lua_State *L) { lua_State *L1; lua_lock(L); luaC_checkGC(L); L1 = luaE_newthread(L); setthvalue(L->top, L1); api_incr_top(L); lua_unlock(L); lua_userstateopen(L1); return L1;}/*** basic stack manipulation*/LUA_API int lua_gettop (lua_State *L) { return (L->top - L->base);}LUA_API void lua_settop (lua_State *L, int idx) { lua_lock(L); if (idx >= 0) { api_check(L, idx <= L->stack_last - L->base); while (L->top < L->base + idx) setnilvalue(L->top++); L->top = L->base + idx; } else { api_check(L, -(idx+1) <= (L->top - L->base)); L->top += idx+1; /* `subtract' index (index is negative) */ } lua_unlock(L);}LUA_API void lua_remove (lua_State *L, int idx) { StkId p; lua_lock(L); p = luaA_index(L, idx); while (++p < L->top) setobjs2s(p-1, p); L->top--; lua_unlock(L);}LUA_API void lua_insert (lua_State *L, int idx) { StkId p; StkId q; lua_lock(L); p = luaA_index(L, idx); for (q = L->top; q>p; q--) setobjs2s(q, q-1); setobjs2s(p, L->top); lua_unlock(L);}LUA_API void lua_replace (lua_State *L, int idx) { lua_lock(L); api_checknelems(L, 1); setobj(luaA_index(L, idx), L->top - 1); /* write barrier */ L->top--; lua_unlock(L);}LUA_API void lua_pushvalue (lua_State *L, int idx) { lua_lock(L); setobj2s(L->top, luaA_index(L, idx)); api_incr_top(L); lua_unlock(L);}/*** access functions (stack -> C)*/LUA_API int lua_type (lua_State *L, int idx) { StkId o = luaA_indexAcceptable(L, idx); return (o == NULL) ? LUA_TNONE : ttype(o);}LUA_API const char *lua_typename (lua_State *L, int t) { UNUSED(L); return (t == LUA_TNONE) ? "no value" : luaT_typenames[t];}LUA_API int lua_iscfunction (lua_State *L, int idx) { StkId o = luaA_indexAcceptable(L, idx); return (o == NULL) ? 0 : iscfunction(o);}LUA_API int lua_isnumber (lua_State *L, int idx) { TObject n; const TObject *o = luaA_indexAcceptable(L, idx); return (o != NULL && tonumber(o, &n));}LUA_API int lua_isstring (lua_State *L, int idx) { int t = lua_type(L, idx); return (t == LUA_TSTRING || t == LUA_TNUMBER);}LUA_API int lua_isuserdata (lua_State *L, int idx) { const TObject *o = luaA_indexAcceptable(L, idx); return (o != NULL && (ttisuserdata(o) || ttislightuserdata(o)));}LUA_API int lua_rawequal (lua_State *L, int index1, int index2) { StkId o1 = luaA_indexAcceptable(L, index1); StkId o2 = luaA_indexAcceptable(L, index2); return (o1 == NULL || o2 == NULL) ? 0 /* index out of range */ : luaO_rawequalObj(o1, o2);}LUA_API int lua_equal (lua_State *L, int index1, int index2) { StkId o1, o2; int i; lua_lock(L); /* may call tag method */ o1 = luaA_indexAcceptable(L, index1); o2 = luaA_indexAcceptable(L, index2); i = (o1 == NULL || o2 == NULL) ? 0 /* index out of range */ : equalobj(L, o1, o2); lua_unlock(L); return i;}LUA_API int lua_lessthan (lua_State *L, int index1, int index2) { StkId o1, o2; int i; lua_lock(L); /* may call tag method */ o1 = luaA_indexAcceptable(L, index1); o2 = luaA_indexAcceptable(L, index2); i = (o1 == NULL || o2 == NULL) ? 0 /* index out-of-range */ : luaV_lessthan(L, o1, o2); lua_unlock(L); return i;}LUA_API lua_Number lua_tonumber (lua_State *L, int idx) { TObject n; const TObject *o = luaA_indexAcceptable(L, idx); if (o != NULL && tonumber(o, &n)) return nvalue(o); else return 0;}LUA_API int lua_toboolean (lua_State *L, int idx) { const TObject *o = luaA_indexAcceptable(L, idx); return (o != NULL) && !l_isfalse(o);}LUA_API const char *lua_tostring (lua_State *L, int idx) { StkId o = luaA_indexAcceptable(L, idx); if (o == NULL) return NULL; else if (ttisstring(o)) return svalue(o); else { const char *s; lua_lock(L); /* `luaV_tostring' may create a new string */ s = (luaV_tostring(L, o) ? svalue(o) : NULL); luaC_checkGC(L); lua_unlock(L); return s; }}LUA_API size_t lua_strlen (lua_State *L, int idx) { StkId o = luaA_indexAcceptable(L, idx); if (o == NULL) return 0; else if (ttisstring(o)) return tsvalue(o)->tsv.len; else { size_t l; lua_lock(L); /* `luaV_tostring' may create a new string */ l = (luaV_tostring(L, o) ? tsvalue(o)->tsv.len : 0); lua_unlock(L); return l; }}LUA_API lua_CFunction lua_tocfunction (lua_State *L, int idx) { StkId o = luaA_indexAcceptable(L, idx); return (o == NULL || !iscfunction(o)) ? NULL : clvalue(o)->c.f;}LUA_API void *lua_touserdata (lua_State *L, int idx) { StkId o = luaA_indexAcceptable(L, idx); if (o == NULL) return NULL; switch (ttype(o)) { case LUA_TUSERDATA: return (uvalue(o) + 1); case LUA_TLIGHTUSERDATA: return pvalue(o); default: return NULL; }}LUA_API lua_State *lua_tothread (lua_State *L, int idx) { StkId o = luaA_indexAcceptable(L, idx); return (o == NULL || !ttisthread(o)) ? NULL : thvalue(o);}LUA_API const void *lua_topointer (lua_State *L, int idx) { StkId o = luaA_indexAcceptable(L, idx); if (o == NULL) return NULL; else { switch (ttype(o)) { case LUA_TTABLE: return hvalue(o); case LUA_TFUNCTION: return clvalue(o); case LUA_TTHREAD: return thvalue(o); case LUA_TUSERDATA: case LUA_TLIGHTUSERDATA: return lua_touserdata(L, idx); default: return NULL; } }}/*** push functions (C -> stack)*/LUA_API void lua_pushnil (lua_State *L) { lua_lock(L); setnilvalue(L->top); api_incr_top(L); lua_unlock(L);}LUA_API void lua_pushnumber (lua_State *L, lua_Number n) { lua_lock(L); setnvalue(L->top, n); api_incr_top(L); lua_unlock(L);}LUA_API void lua_pushlstring (lua_State *L, const char *s, size_t len) { lua_lock(L); luaC_checkGC(L); setsvalue2s(L->top, luaS_newlstr(L, s, len)); api_incr_top(L); lua_unlock(L);}LUA_API void lua_pushstring (lua_State *L, const char *s) { if (s == NULL) lua_pushnil(L); else lua_pushlstring(L, s, strlen(s));}LUA_API const char *lua_pushvfstring (lua_State *L, const char *fmt, va_list argp) { const char *ret; lua_lock(L); luaC_checkGC(L); ret = luaO_pushvfstring(L, fmt, argp); lua_unlock(L); return ret;}LUA_API const char *lua_pushfstring (lua_State *L, const char *fmt, ...) { const char *ret; va_list argp; lua_lock(L); luaC_checkGC(L); va_start(argp, fmt); ret = luaO_pushvfstring(L, fmt, argp); va_end(argp); lua_unlock(L); return ret;}LUA_API void lua_pushcclosure (lua_State *L, lua_CFunction fn, int n) { Closure *cl; lua_lock(L); luaC_checkGC(L); api_checknelems(L, n); cl = luaF_newCclosure(L, n); cl->c.f = fn; L->top -= n; while (n--) setobj2n(&cl->c.upvalue[n], L->top+n); setclvalue(L->top, cl); api_incr_top(L); lua_unlock(L);}
⌨️ 快捷键说明
复制代码
Ctrl + C
搜索代码
Ctrl + F
全屏模式
F11
切换主题
Ctrl + Shift + D
显示快捷键
?
增大字号
Ctrl + =
减小字号
Ctrl + -