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Add 'minetest.write_json'

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ShadowNinja 2013-12-18 16:46:53 -05:00
parent 49cec3f782
commit 1ed90c90c3
5 changed files with 92 additions and 1 deletions
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49
src/script/common/c_content.cpp
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@ -1081,3 +1081,52 @@ bool push_json_value(lua_State *L, const Json::Value &value, int nullindex)
else
return false;
}
// Converts Lua table --> JSON
void get_json_value(lua_State *L, Json::Value &root, int index)
{
int type = lua_type(L, index);
if (type == LUA_TBOOLEAN) {
root = (bool) lua_toboolean(L, index);
} else if (type == LUA_TNUMBER) {
root = lua_tonumber(L, index);
} else if (type == LUA_TSTRING) {
size_t len;
const char *str = lua_tolstring(L, index, &len);
root = std::string(str, len);
} else if (type == LUA_TTABLE) {
lua_pushnil(L);
while (lua_next(L, index)) {
// Key is at -2 and value is at -1
Json::Value value;
get_json_value(L, value, lua_gettop(L));
Json::ValueType roottype = root.type();
int keytype = lua_type(L, -1);
if (keytype == LUA_TNUMBER) {
lua_Number key = lua_tonumber(L, -1);
if (roottype != Json::nullValue && roottype != Json::arrayValue) {
throw LuaError(NULL, "Can't mix array and object values in JSON");
} else if (key < 1) {
throw LuaError(NULL, "Can't use zero-based or negative indexes in JSON");
} else if (floor(key) != key) {
throw LuaError(NULL, "Can't use indexes with a fractional part in JSON");
}
root[(Json::ArrayIndex) key - 1] = value;
} else if (keytype == LUA_TSTRING) {
if (roottype != Json::nullValue && roottype != Json::objectValue) {
throw LuaError(NULL, "Can't mix array and object values in JSON");
}
root[lua_tostring(L, -1)] = value;
} else {
throw LuaError(NULL, "Lua key to convert to JSON is not a string or number");
}
}
} else if (type == LUA_TNIL) {
root = Json::nullValue;
} else {
throw LuaError(NULL, "Can only store booleans, numbers, strings, objects, arrays, and null in JSON");
}
lua_pop(L, 1); // Pop value
}