Darwinism/Google.Protobuf/WellKnownTypes/FieldMaskPartial.vb

#Region "Copyright notice and license"
' Protocol Buffers - Google's data interchange format
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#End Region

Imports System
Imports System.Collections
Imports System.Collections.Generic
Imports System.IO
Imports System.Linq

Namespace Google.Protobuf.WellKnownTypes
    ' Manually-written partial class for the FieldMask well-known type.
    Public Partial Class FieldMask
        Implements ICustomDiagnosticMessage
        ''' <summary>
        ''' Converts a timestamp  specified in seconds/nanoseconds to a string.
        ''' </summary>
        ''' <remarks>
        ''' If the value is a normalized duration in the range described in <c>field_mask.proto</c>,
        ''' <paramrefname="diagnosticOnly"/> is ignored. Otherwise, if the parameter is <c>true</c>,
        ''' a JSON object with a warning is returned; if it is <c>false</c>, an <see cref="InvalidOperationException"/> is thrown.
        ''' </remarks>
        ''' <param name="paths">Paths in the field mask</param>
        ''' <param name="diagnosticOnly">Determines the handling of non-normalized values</param>
        ''' <exception cref="InvalidOperationException">The represented duration is invalid, and <paramrefname="diagnosticOnly"/> is <c>false</c>.</exception>
        Friend Shared Function ToJson(paths As IList(Of String), diagnosticOnly As Boolean) As String
            Dim firstInvalid = paths.FirstOrDefault(Function(p) Not ValidatePath(p))

            If Equals(firstInvalid, Nothing) Then
                Dim writer = New StringWriter()
#If DOTNET35
                var query = paths.Select(JsonFormatter.ToCamelCase);
                JsonFormatter.WriteString(writer, string.Join(",", query.ToArray()));
#Else
                JsonFormatter.WriteString(writer, String.Join(",", paths.[Select](New Func(Of String, String)(AddressOf JsonFormatter.ToCamelCase))))
#End If
                Return writer.ToString()
            Else

                If diagnosticOnly Then
                    Dim writer = New StringWriter()
                    writer.Write("{ ""@warning"": ""Invalid FieldMask"", ""paths"": ")
                    JsonFormatter.Default.WriteList(writer, CType(paths, IList))
                    writer.Write(" }")
                    Return writer.ToString()
                Else
                    Throw New InvalidOperationException($"Invalid field mask to be converted to JSON: {firstInvalid}")
                End If
            End If
        End Function

        ''' <summary>
        ''' Camel-case converter with added strictness for field mask formatting.
        ''' </summary>
        ''' <exception cref="InvalidOperationException">The field mask is invalid for JSON representation</exception>
        Private Shared Function ValidatePath(input As String) As Boolean
            For i = 0 To input.Length - 1
                Dim c = input(i)

                If c >= "A"c AndAlso c <= "Z"c Then
                    Return False
                End If

                If c = "_"c AndAlso i < input.Length - 1 Then
                    Dim [next] = input(i + 1)

                    If [next] < "a"c OrElse [next] > "z"c Then
                        Return False
                    End If
                End If
            Next

            Return True
        End Function

        ''' <summary>
        ''' Returns a string representation of this <see cref="FieldMask"/> for diagnostic purposes.
        ''' </summary>
        ''' <remarks>
        ''' Normally the returned value will be a JSON string value (including leading and trailing quotes) but
        ''' when the value is non-normalized or out of range, a JSON object representation will be returned
        ''' instead, including a warning. This is to avoid exceptions being thrown when trying to
        ''' diagnose problems - the regular JSON formatter will still throw an exception for non-normalized
        ''' values.
        ''' </remarks>
        ''' <returns>A string representation of this value.</returns>
        Public Function ToDiagnosticString() As String Implements ICustomDiagnosticMessage.ToDiagnosticString
            Return ToJson(Paths, True)
        End Function
    End Class
End Namespace