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JSON文字列の直接書き換えを回避

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ousttrue
2021-12-16 19:38:43 +09:00
parent 805613b1fe
commit fdb4899019
1 changed files with 85 additions and 97 deletions
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182
Assets/UniGLTF/Runtime/UniGLTF/IO/GltfJsonUtil.cs
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@@ -96,6 +96,84 @@ namespace UniGLTF
return false;
}
static void CopyJson(IReadOnlyList<string> extensionUsed, JsonFormatter dst, JsonNode src, int level)
{
if (src.IsArray())
{
dst.BeginList();
foreach (var v in src.ArrayItems())
{
CopyJson(extensionUsed, dst, v, level + 1);
}
dst.EndList();
}
else if (src.IsMap())
{
if (level == 0)
{
// 最上層だけ extensionsUsed の処理をする
var done = false;
dst.BeginMap();
foreach (var kv in src.ObjectItems())
{
var key = kv.Key.GetString();
if (key == EXTENSION_USED_KEY)
{
if (extensionUsed.Count == 0)
{
// skip
}
else
{
dst.Key(key);
// replace
dst.BeginList();
foreach (var ex in extensionUsed)
{
dst.Value(ex);
}
dst.EndList();
// 処理済
}
done = true;
}
else
{
dst.Key(key);
CopyJson(extensionUsed, dst, kv.Value, level + 1);
}
}
if (!done && level == 0 && extensionUsed.Count > 0)
{
// add
dst.Key(EXTENSION_USED_KEY);
dst.BeginList();
foreach (var ex in extensionUsed)
{
dst.Value(ex);
}
dst.EndList();
}
dst.EndMap();
}
else
{
dst.BeginMap();
foreach (var kv in src.ObjectItems())
{
dst.Key(kv.Key.GetUtf8String());
CopyJson(extensionUsed, dst, kv.Value, level + 1);
}
dst.EndMap();
}
}
else
{
// leaf
dst.Value(src);
}
}
/// <summary>
/// https://github.com/KhronosGroup/glTF/blob/main/specification/2.0/schema/glTF.schema.json
///
@@ -121,104 +199,14 @@ namespace UniGLTF
}
}
if (used.Count == 0)
{
// 無いとき
if (parsed.ContainsKey(EXTENSION_USED_KEY))
{
foreach (var kv in parsed.ObjectItems())
{
if (kv.Key.GetString() == EXTENSION_USED_KEY)
{
// 削除範囲は
// kv.Key の先頭から kv.Value の後ろ
// kv.Value の次の文字は , か } がありえる。
var begin = kv.Key.Value.Segment.Bytes.Offset;
var end = kv.Value.Value.Segment.Bytes.Offset + kv.Value.Value.Segment.Bytes.Count;
var array = kv.Key.Value.Segment.Bytes.Array;
for (var i = end; i < array.Length; ++i)
{
if (array[i] == ',')
{
end = i + 1;
break;
}
else if (array[i] == '}')
{
// begin 側の , を探す
for (var j = begin - 1; j >= 0; --j)
{
if (array[j] == ',')
{
begin = j;
break;
}
}
end = i;
break;
}
}
// json 加工
var f = new JsonFormatter();
CopyJson(used.ToArray(), f, parsed, 0);
using (var w = new MemoryStream())
{
// before
w.Write(array, 0, begin);
// after
w.Write(array, end, array.Length - end);
// BOM 無し encoder
var utf8 = new UTF8Encoding(false);
src = utf8.GetString(w.ToArray());
}
}
}
}
else
{
// OK
}
}
else
{
if (parsed.ContainsKey(EXTENSION_USED_KEY))
{
var values = "[" + string.Join(",", used.Select(x => DoubleQuote(x))) + "]";
// Debug.Log($"replace: {values}");
// replace
var node = parsed[EXTENSION_USED_KEY];
var segment = node.Value.Segment.Bytes;
// arraySegment.Array に JSON 全体
// arraySegment.Offset~Count に extensionUsed 値が入っている
// BOM 無し encoder
var utf8 = new UTF8Encoding(false);
var bytes = utf8.GetBytes(values);
using (var w = new MemoryStream())
{
// before
w.Write(segment.Array, 0, segment.Offset);
// replace
w.Write(bytes, 0, bytes.Length);
// after
var after = segment.Offset + segment.Count;
w.Write(segment.Array, after, segment.Array.Length - after);
src = utf8.GetString(w.ToArray());
}
}
else
{
var values = "\"" + EXTENSION_USED_KEY + "\":[" + string.Join(",", used.Select(x => DoubleQuote(x))) + "]";
// Debug.Log($"add: {values}");
// add
var close = src.LastIndexOf("}");
src = src.Substring(0, close) + "," + values + "}";
}
}
return src;
// bom無しutf8
var bytes = f.GetStoreBytes();
var utf8 = new UTF8Encoding(false);
return utf8.GetString(bytes.Array, bytes.Offset, bytes.Count);
}
}
}