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Add minetest.parse_json, engine.parse_json

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This commit is contained in:
Kahrl 2013-09-02 02:01:49 +02:00
parent 71a6ffa762
commit 1ecf51a13f
6 changed files with 141 additions and 0 deletions
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82
src/script/common/c_content.cpp
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@ -31,6 +31,7 @@ with this program; if not, write to the Free Software Foundation, Inc.,
#include "tool.h"
#include "serverobject.h"
#include "mapgen.h"
#include "json/json.h"
struct EnumString es_TileAnimationType[] =
{
@ -998,3 +999,84 @@ bool read_schematic(lua_State *L, int index, DecoSchematic *dschem, Server *serv
return true;
}
/******************************************************************************/
// Returns depth of json value tree
static int push_json_value_getdepth(const Json::Value &value)
{
if (!value.isArray() && !value.isObject())
return 1;
int maxdepth = 0;
for (Json::Value::const_iterator it = value.begin();
it != value.end(); ++it) {
int elemdepth = push_json_value_getdepth(*it);
if (elemdepth > maxdepth)
maxdepth = elemdepth;
}
return maxdepth + 1;
}
// Recursive function to convert JSON --> Lua table
static bool push_json_value_helper(lua_State *L, const Json::Value &value,
int nullindex)
{
switch(value.type()) {
case Json::nullValue:
default:
lua_pushvalue(L, nullindex);
break;
case Json::intValue:
lua_pushinteger(L, value.asInt());
break;
case Json::uintValue:
lua_pushinteger(L, value.asUInt());
break;
case Json::realValue:
lua_pushnumber(L, value.asDouble());
break;
case Json::stringValue:
{
const char *str = value.asCString();
lua_pushstring(L, str ? str : "");
}
break;
case Json::booleanValue:
lua_pushboolean(L, value.asInt());
break;
case Json::arrayValue:
lua_newtable(L);
for (Json::Value::const_iterator it = value.begin();
it != value.end(); ++it) {
push_json_value_helper(L, *it, nullindex);
lua_rawseti(L, -2, it.index() + 1);
}
break;
case Json::objectValue:
lua_newtable(L);
for (Json::Value::const_iterator it = value.begin();
it != value.end(); ++it) {
const char *str = it.memberName();
lua_pushstring(L, str ? str : "");
push_json_value_helper(L, *it, nullindex);
lua_rawset(L, -3);
}
break;
}
return true;
}
// converts JSON --> Lua table; returns false if lua stack limit exceeded
// nullindex: Lua stack index of value to use in place of JSON null
bool push_json_value(lua_State *L, const Json::Value &value, int nullindex)
{
if(nullindex < 0)
nullindex = lua_gettop(L) + 1 + nullindex;
int depth = push_json_value_getdepth(value);
// The maximum number of Lua stack slots used at each recursion level
// of push_json_value_helper is 2, so make sure there a depth * 2 slots
if (lua_checkstack(L, depth * 2))
return push_json_value_helper(L, value, nullindex);
else
return false;
}