/// <summary>
/// Decompose path string into the individual navigation members (propertyName[arrayindex])
/// Property names can be separated by periods ($.foo.bar) and can be enclosed in square brackets ($.['foo'].['bar'])
/// </summary>
/// <param name="path"></param>
/// <returns></returns>
private static JsonPathPart DecomposePath(string path)
{
const string jsonPathStarter = "$.";
if (path == "$")
return JsonPathPart.Root;
if (!path.StartsWith(jsonPathStarter))
throw new ArgumentException(
string.Format("Path \"{0}\" doesn't appear to conform to JSONpath syntax.", path),
"path");
List<JsonPathPart> pathParts = new List<JsonPathPart> { JsonPathPart.Root };
StringBuilder reader = new StringBuilder();
JsonPathPart partBeingRead = new JsonPathPart();
PathParserState state = PathParserState.ReadingPropertyName;
for (int i = jsonPathStarter.Length; i < path.Length; i++)
{
// Walk through all the characters of the string and build up the path parts.
char thisChar = path[i];
if (thisChar == '.' && state != PathParserState.ReadingEscapedPropertyName)
{
// End of a part name, save it and start a new path part.
if (reader.Length > 0)
{
if (state == PathParserState.ReadingPropertyName)
{
partBeingRead.PropertyName = reader.ToString();
reader.Clear();
}
else
{
throw new InvalidOperationException("Unexpected state. Malformed JsonPath syntax?");
}
}
pathParts.Add(partBeingRead);
partBeingRead = new JsonPathPart();
state = PathParserState.ReadingPropertyName;
}
else if (thisChar == '[' && state != PathParserState.ReadingEscapedPropertyName)
{
if (reader.Length > 0)
{
if (state == PathParserState.ReadingPropertyName)
{
partBeingRead.PropertyName = reader.ToString();
reader.Clear();
}
else
{
throw new InvalidOperationException("Unexpected state. Malformed JsonPath syntax?");
}
}
state = PathParserState.ReadingIndexer;
}
else if (thisChar == ']' && state != PathParserState.ReadingEscapedPropertyName)
{
if (state != PathParserState.ReadingIndexer)
{
throw new InvalidOperationException("Unexpected state. Malformed JsonPath syntax?");
}
if (reader.Length > 0)
{
partBeingRead.ArrayIndex = Int32.Parse(reader.ToString());
reader.Clear();
}
state = PathParserState.PartComplete;
}
else if (thisChar == '\'')
{
if (state == PathParserState.ReadingIndexer && reader.Length == 0)
{
state = PathParserState.ReadingEscapedPropertyName;
}
else if (state == PathParserState.ReadingEscapedPropertyName && reader.Length > 0)
{
partBeingRead.PropertyName = reader.ToString();
reader.Clear();
state = PathParserState.ReadingIndexer;
}
else
{
throw new InvalidOperationException("Unexpected state. Malformed JsonPath syntax?");
}
}
else
{
reader.Append(thisChar);
}
}
if (reader.Length > 0 && (state == PathParserState.ReadingPropertyName || state == PathParserState.PartComplete))
{
partBeingRead.PropertyName = reader.ToString();
}
else if (reader.Length > 0)
{
throw new InvalidOperationException("Unexpected content in reader buffer. Malformed JsonPath syntax?");
}
// Add the final part, if it wasn't there already.
if (!string.IsNullOrEmpty(partBeingRead.PropertyName))
{
pathParts.Add(partBeingRead);
}
for (int i = 0; i < pathParts.Count; i++)
{
if (i < pathParts.Count - 1)
pathParts[i].Child = pathParts[i + 1];
}
return pathParts[0];
}
/// <summary>
/// Decompose path string into the individual navigation members (propertyName[arrayindex])
/// Property names can be separated by periods ($.foo.bar) and can be enclosed in square brackets ($.['foo'].['bar'])
/// </summary>
/// <param name="path"></param>
/// <returns></returns>
private static JsonPathPart DecomposePath(string path)
{
const string jsonPathStarter = "$.";
if (path == "$")
{
return(JsonPathPart.Root);
}
if (!path.StartsWith(jsonPathStarter))
{
throw new ArgumentException(
string.Format("Path \"{0}\" doesn't appear to conform to JSONpath syntax.", path),
"path");
}
List <JsonPathPart> pathParts = new List <JsonPathPart> {
JsonPathPart.Root
};
StringBuilder reader = new StringBuilder();
JsonPathPart partBeingRead = new JsonPathPart();
PathParserState state = PathParserState.ReadingPropertyName;
for (int i = jsonPathStarter.Length; i < path.Length; i++)
{
// Walk through all the characters of the string and build up the path parts.
char thisChar = path[i];
if (thisChar == '.' && state != PathParserState.ReadingEscapedPropertyName)
{
// End of a part name, save it and start a new path part.
if (reader.Length > 0)
{
if (state == PathParserState.ReadingPropertyName)
{
partBeingRead.PropertyName = reader.ToString();
reader.Clear();
}
else
{
throw new InvalidOperationException("Unexpected state. Malformed JsonPath syntax?");
}
}
pathParts.Add(partBeingRead);
partBeingRead = new JsonPathPart();
state = PathParserState.ReadingPropertyName;
}
else if (thisChar == '[' && state != PathParserState.ReadingEscapedPropertyName)
{
if (reader.Length > 0)
{
if (state == PathParserState.ReadingPropertyName)
{
partBeingRead.PropertyName = reader.ToString();
reader.Clear();
}
else
{
throw new InvalidOperationException("Unexpected state. Malformed JsonPath syntax?");
}
}
state = PathParserState.ReadingIndexer;
}
else if (thisChar == ']' && state != PathParserState.ReadingEscapedPropertyName)
{
if (state != PathParserState.ReadingIndexer)
{
throw new InvalidOperationException("Unexpected state. Malformed JsonPath syntax?");
}
if (reader.Length > 0)
{
partBeingRead.ArrayIndex = Int32.Parse(reader.ToString());
reader.Clear();
}
state = PathParserState.PartComplete;
}
else if (thisChar == '\'')
{
if (state == PathParserState.ReadingIndexer && reader.Length == 0)
{
state = PathParserState.ReadingEscapedPropertyName;
}
else if (state == PathParserState.ReadingEscapedPropertyName && reader.Length > 0)
{
partBeingRead.PropertyName = reader.ToString();
reader.Clear();
state = PathParserState.ReadingIndexer;
}
else
{
throw new InvalidOperationException("Unexpected state. Malformed JsonPath syntax?");
}
}
else
{
reader.Append(thisChar);
}
}
if (reader.Length > 0 && (state == PathParserState.ReadingPropertyName || state == PathParserState.PartComplete))
{
partBeingRead.PropertyName = reader.ToString();
}
else if (reader.Length > 0)
{
throw new InvalidOperationException("Unexpected content in reader buffer. Malformed JsonPath syntax?");
}
// Add the final part, if it wasn't there already.
if (!string.IsNullOrEmpty(partBeingRead.PropertyName))
{
pathParts.Add(partBeingRead);
}
for (int i = 0; i < pathParts.Count; i++)
{
if (i < pathParts.Count - 1)
{
pathParts[i].Child = pathParts[i + 1];
}
}
return(pathParts[0]);
}
