/// <summary>
/// Patch a JSON object
/// </summary>
/// <param name="left">Unpatched JSON object</param>
/// <param name="patch">JSON Patch Document</param>
/// <returns>Patched JSON object</returns>
/// <exception cref="System.IO.InvalidDataException">Thrown if the patch document is invalid</exception>
public JToken Patch(JToken left, JToken patch)
{
if (patch == null)
return left;
if (patch.Type == JTokenType.Object)
{
var patchObj = (JObject)patch;
JProperty arrayDiffCanary = patchObj.Property("_t");
if (left != null
&& left.Type == JTokenType.Array
&& arrayDiffCanary != null
&& arrayDiffCanary.Value.Type == JTokenType.String
&& arrayDiffCanary.ToObject<string>() == "a")
{
return ArrayPatch((JArray)left, patchObj);
}
return ObjectPatch(left as JObject, patchObj);
}
if (patch.Type == JTokenType.Array)
{
var patchArray = (JArray)patch;
if (patchArray.Count == 1) // Add
{
return patchArray[0];
}
else if (patchArray.Count == 2) // Replace
{
return patchArray[1];
}
else if (patchArray.Count == 3) // Delete, Move or TextDiff
{
if (patchArray[2].Type != JTokenType.Integer)
throw new InvalidDataException("Invalid patch object");
int op = patchArray[2].Value<int>();
if (op == 0)
{
return null;
}
else if (op == 2)
{
var dmp = new diff_match_patch();
List<Patch> patches = dmp.patch_fromText(patchArray[0].ToObject<string>());
if (patches.Count != 1)
throw new InvalidDataException("Invalid textline");
string right = dmp.diff_text2(patches[0].diffs);
return right;
}
else
{
throw new InvalidDataException("Invalid patch object");
}
}
else
{
throw new InvalidDataException("Invalid patch object");
}
}
return null;
}