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if lua table to encode has metamethod '__pairs', use it #24

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if lua table to encode has metamethod '__pairs', use it #24

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70 changes: 54 additions & 16 deletions lua_cjson.c
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Original file line number Diff line number Diff line change
Expand Up @@ -497,25 +497,63 @@ static int lua_array_length(lua_State *l, json_config_t *cfg, strbuf_t *json)
max = 0;
items = 0;

lua_pushnil(l);
/* table, startkey */
while (lua_next(l, -2) != 0) {
/* table, key, value */
if (lua_type(l, -2) == LUA_TNUMBER &&
(k = lua_tonumber(l, -2))) {
/* Integer >= 1 ? */
if (floor(k) == k && k >= 1) {
if (k > max)
max = k;
items++;
lua_pop(l, 1);
continue;
if (luaL_getmetafield(l, -1, "__pairs")) {
int index = lua_gettop(l) - 1;
int type;
lua_pushvalue(l, -2);
lua_call(l, 1, 3);
lua_newtable(l);
lua_replace(l, index);
while (1) {
lua_pushvalue(l, -2);
lua_pushvalue(l, -2);
lua_copy(l, -5, -3);
lua_call(l, 2, 2);
type = lua_type(l, -2);
if (type == LUA_TNIL)
break;
if (items >= 0) {
if (type == LUA_TNUMBER &&
(k = lua_tonumber(l, -2))) {
if (floor(k) == k && k >= -1) {
if (k > max)
max = k;
items++;
} else {
items = -1;
}
} else {
items = -1;
}
}
lua_pushvalue(l, -1);
lua_copy(l, -3, -2);
lua_rawset(l, index);
}
lua_settop(l, index);
if (items < 0)
return -1;
} else {
lua_pushnil(l);
/* table, startkey */
while (lua_next(l, -2) != 0) {
/* table, key, value */
if (lua_type(l, -2) == LUA_TNUMBER &&
(k = lua_tonumber(l, -2))) {
/* Integer >= 1 ? */
if (floor(k) == k && k >= 1) {
if (k > max)
max = k;
items++;
lua_pop(l, 1);
continue;
}
}

/* Must not be an array (non integer key) */
lua_pop(l, 2);
return -1;
/* Must not be an array (non integer key) */
lua_pop(l, 2);
return -1;
}
}

/* Encode excessively sparse arrays as objects (if enabled) */
Expand Down