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Copy pathlua-array.c
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233 lines (214 loc) · 4.59 KB
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#include<lua.h>
#include<lauxlib.h>
#include<stdio.h>
staticint
lnewindex(lua_State*L) {
luaL_checktype(L, 1, LUA_TTABLE);
lua_Integeridx=luaL_checkinteger(L, 2);
if (idx <= 0) {
returnluaL_error(L, "The index should be positive (%d)", (int)idx);
}
lua_settop(L, 3);
lua_rawseti(L, 1, idx);
size_trawlen=lua_rawlen(L, 1);
if (rawlen >= idx) {
return0;
}
lua_rawgeti(L, 1, 0);
lua_Integersparselen=luaL_checkinteger(L, -1);
if (sparselen<0)
sparselen=-sparselen;
++sparselen;
lua_pushinteger(L, sparselen);
lua_rawseti(L, 1, 0);
lua_pushinteger(L, idx);
lua_rawseti(L, 1, -sparselen);
return0;
}
staticint
insert(lua_State*L, lua_Integerkey, intn) {
intbegin=0, end=n;
intmid;
while (begin<end) {
mid= (begin+end)/2;
lua_rawgeti(L, 1, -mid-1);
lua_Integerv=luaL_checkinteger(L, -1);
lua_pop(L, 1);
if (v==key)
return0; // replicate
if (v<key)
begin=mid+1;
else
end=mid;
}
// insert before end
inti;
for (i=n;i>end;i--) {
lua_rawgeti(L, 1, -i);
lua_rawseti(L, 1, -i-1);
}
lua_pushinteger(L, key);
lua_rawseti(L, 1, -end-1);
return1;
}
staticlua_Integer
sort_sparse(lua_State*L, lua_Integersparselen) {
size_trawlen=lua_rawlen(L, 1);
lua_Integeri, n=0;
// insertion sort
for (i=0; i<sparselen; i++) {
lua_rawgeti(L, 1, -i-1);
lua_Integeridx=luaL_checkinteger(L, -1);
lua_pop(L, 1);
if (idx <= rawlen)
continue;
if (lua_rawgeti(L, 1, idx) ==LUA_TNIL) {
lua_pop(L, 1); // value removed
continue;
}
lua_pop(L, 1);
if (insert(L, idx, n))
++n;
}
for (i=n;i<sparselen;i++) {
lua_pushnil(L);
lua_rawseti(L, 1, -i-1);
}
lua_pushinteger(L, -n);
lua_rawseti(L, 1, 0);
returnn;
}
staticint
lsort(lua_State*L) {
lua_Integersparselen=luaL_checkinteger(L, 2);
sparselen=sort_sparse(L, sparselen);
lua_pushinteger(L, sparselen);
return1;
}
staticint
lnext(lua_State*L) {
luaL_checktype(L, 1, LUA_TTABLE);
lua_Integeridx;
if (lua_isnoneornil(L, 2)) {
idx=1;
} else {
if (!lua_isinteger(L, 2)) {
returnluaL_error(L, "last index should be integer");
}
idx=lua_tointeger(L, 2) +1;
}
if (lua_rawgeti(L, 1, idx) !=LUA_TNIL) {
lua_pushinteger(L, idx);
lua_pushvalue(L, -2);
return2;
}
size_trawlen=lua_rawlen(L, 1);
if (rawlen >= idx) {
size_ti;
for (i=idx+1; i <= rawlen; i++) {
if (lua_rawgeti(L, 1, i) !=LUA_TNIL) {
lua_pushinteger(L, i);
lua_pushvalue(L, -2);
return2;
}
lua_pop(L, 1);
}
returnluaL_error(L, "Invalid index %d", (int)idx);
}
if (lua_rawgeti(L, 1, 0) !=LUA_TNUMBER)
returnluaL_error(L, "Invalid array");
lua_Integersparselen=lua_tointeger(L, -1);
lua_pop(L, 1);
if (sparselen==0)
return0;
if (sparselen>0) {
lua_pushcfunction(L, lsort);
lua_pushvalue(L, 1);
lua_pushinteger(L, sparselen);
lua_call(L, 2, 1); // resort sparse array
sparselen=lua_tointeger(L, -1);
lua_pop(L, 1);
} else {
sparselen=-sparselen;
}
// binary search
lua_Integerbegin=0, end=sparselen;
while (begin<end) {
lua_Integermid= (begin+end)/2;
lua_rawgeti(L, 1, -mid-1);
lua_Integerv=luaL_checkinteger(L, -1);
lua_pop(L, 1);
if (v>idx) {
end=mid;
} elseif (v<idx) {
begin=mid+1;
} else {
begin=mid;
break;
}
}
if (begin >= sparselen)
return0;
lua_rawgeti(L, 1, -begin-1);
idx=luaL_checkinteger(L, -1);
lua_rawgeti(L, 1, idx);
return2;
}
staticint
lpairs(lua_State*L) {
luaL_checktype(L, 1, LUA_TTABLE);
lua_rawgeti(L, 1, 0);
lua_Integersparselen=luaL_checkinteger(L, -1);
if (sparselen>0) {
sort_sparse(L, sparselen);
}
lua_pushcfunction(L, lnext);
lua_pushvalue(L, 1);
lua_pushnil(L);
return3;
}
staticint
llen(lua_State*L) {
luaL_checktype(L, 1, LUA_TTABLE);
lua_rawgeti(L, 1, 0);
lua_Integersparselen=luaL_checkinteger(L, -1);
if (sparselen>0) {
sparselen=sort_sparse(L, sparselen);
} else {
sparselen=-sparselen;
}
if (sparselen==0) {
lua_pushinteger(L, lua_rawlen(L, 1));
return1;
}
lua_rawgeti(L, 1, -sparselen);
return1;
}
staticint
lnewarray(lua_State*L) {
intn=lua_gettop(L);
lua_createtable(L, n, 0);
lua_pushvalue(L, lua_upvalueindex(1));
lua_setmetatable(L, -2);
inti;
for (i=1;i<=n;i++) {
lua_pushvalue(L, i);
lua_rawseti(L, -2, i);
}
lua_pushinteger(L, 0);
lua_rawseti(L, -2, 0);
return1;
}
LUAMOD_APIint
luaopen_array(lua_State*L) {
luaL_checkversion(L);
luaL_Regmetatable[] = {
{ "__newindex", lnewindex },
{ "__pairs", lpairs },
{ "__len", llen },
{ NULL, NULL },
};
luaL_newlib(L, metatable);
lua_pushcclosure(L, lnewarray, 1);
return1;
}