/// <summary>
/// Emits a single element to the binary stream
/// </summary>
/// <param name="writer"></param>
/// <param name="tokens"></param>
/// <param name="ename"></param>
/// <returns>number of bytes written</returns>
private int WriteElement(BinaryWriter writer, IStream <Token <ModelTokenType> > tokens, string ename)
{
Token <ModelTokenType> token = tokens.Peek();
if (tokens.IsCompleted || token == null)
{
throw new TokenException <ModelTokenType>(token, BsonWriter.ErrorUnterminated);
}
BsonElementType elemType;
switch (token.TokenType)
{
case ModelTokenType.ArrayBegin:
{
elemType = BsonElementType.Array;
break;
}
case ModelTokenType.ObjectBegin:
{
elemType = BsonElementType.Document;
break;
}
case ModelTokenType.Primitive:
{
elemType = BsonFormatter.GetElementType(token.Value);
break;
}
default:
{
// the rest are invalid states
throw new TokenException <ModelTokenType>(token,
String.Format(BsonWriter.ErrorUnexpectedToken, token.TokenType));
}
}
// write element type
writer.Write((byte)elemType);
int total = BsonWriter.SizeOfByte; // for element type
// write EName
total += BsonFormatter.WriteString(writer, ename, true);
IBsonFormattable formattable = token.Value as IBsonFormattable;
if (formattable != null)
{
total += formattable.Format(this, writer);
}
else
{
switch (elemType)
{
case BsonElementType.Double:
{
// consume token value
tokens.Pop();
// write double data
writer.Write((double)token.Value);
total += BsonWriter.SizeOfDouble;
break;
}
case BsonElementType.String:
case BsonElementType.JavaScriptCode:
case BsonElementType.Symbol:
{
// consume token value
tokens.Pop();
// write as string data
total += BsonFormatter.WriteString(writer, token.ValueAsString(), false);
break;
}
case BsonElementType.Document:
case BsonElementType.Array:
{
// delegate property to sub-document
total += this.WriteDocument(writer, tokens);
break;
}
case BsonElementType.Binary:
{
// consume token value
tokens.Pop();
total += BsonFormatter.WriteBinary(writer, token);
break;
}
case BsonElementType.ObjectID:
{
// consume token value
tokens.Pop();
// write ObjectID data
writer.Write((byte[])token.Value);
total += BsonWriter.SizeOfObjectID;
break;
}
case BsonElementType.Boolean:
{
// consume token value
tokens.Pop();
// write bool data
bool value = true.Equals(token.Value);
writer.Write(value ? BsonWriter.TrueByte : BsonWriter.FalseByte);
total += BsonWriter.SizeOfByte;
break;
}
case BsonElementType.DateTimeUtc:
{
// consume token value
tokens.Pop();
DateTime value = (DateTime)token.Value;
if (value.Kind == DateTimeKind.Local)
{
// convert server-local to UTC
value = value.ToUniversalTime();
}
// find the duration since Jan 1, 1970
TimeSpan duration = value.Subtract(BsonWriter.UnixEpoch);
// get the total milliseconds
long ticks = (long)duration.TotalMilliseconds;
// write long data
writer.Write((long)ticks);
total += BsonWriter.SizeOfInt64;
break;
}
case BsonElementType.RegExp:
{
// consume token value
tokens.Pop();
Regex regex = token.Value as Regex;
if (regex == null)
{
goto default;
}
// default implementation is to simply return the pattern string
string pattern = regex.ToString();
// write cstring data
total += BsonFormatter.WriteString(writer, pattern, true);
bool isGlobal = false; // nothing to switch on
string options = isGlobal ? "g" : "";
switch (regex.Options & (RegexOptions.IgnoreCase | RegexOptions.Multiline))
{
case RegexOptions.IgnoreCase:
{
options += "i";
break;
}
case RegexOptions.Multiline:
{
options += "m";
break;
}
case RegexOptions.IgnoreCase | RegexOptions.Multiline:
{
options += "im";
break;
}
}
// write cstring data
total += BsonFormatter.WriteString(writer, options, true);
break;
}
case BsonElementType.DBPointer:
{
// consume token value
tokens.Pop();
BsonDBPointer pointer = token.Value as BsonDBPointer;
if (pointer == null)
{
goto default;
}
// write string data
total += BsonFormatter.WriteString(writer, pointer.Namespace, false);
// write bytes
writer.Write((byte[])pointer.ObjectID);
total += BsonWriter.SizeOfObjectID;
break;
}
case BsonElementType.CodeWithScope:
{
// consume token value
tokens.Pop();
BsonCodeWithScope codews = token.Value as BsonCodeWithScope;
if (codews == null)
{
goto default;
}
total += this.WriteCodeWithScope(writer, codews);
break;
}
case BsonElementType.Int32:
{
// consume token value
tokens.Pop();
// write int data
writer.Write((int)token.Value);
total += BsonWriter.SizeOfInt32;
break;
}
case BsonElementType.TimeStamp:
case BsonElementType.Int64:
{
// consume token value
tokens.Pop();
// TODO: determine how to convert TimeStamp
// write long data
writer.Write((long)token.Value);
total += BsonWriter.SizeOfInt64;
break;
}
case BsonElementType.Undefined:
case BsonElementType.Null:
case BsonElementType.MinKey:
case BsonElementType.MaxKey:
{
// consume token value
tokens.Pop();
// no data emitted for these
break;
}
default:
{
// the rest are invalid states
throw new TokenException <ModelTokenType>(token,
String.Format(BsonWriter.ErrorUnexpectedToken, token.TokenType));
}
}
}
return(total);
}
private static void ReadElement(List <Token <ModelTokenType> > tokens, BinaryReader reader, bool isArrayItem)
{
BsonElementType elemType = (BsonElementType)reader.ReadByte();
string ename = BsonTokenizer.ReadCString(reader);
if (!isArrayItem)
{
tokens.Add(ModelGrammar.TokenProperty(ename));
}
switch (elemType)
{
case BsonElementType.Double:
{
double value = reader.ReadDouble();
tokens.Add(ModelGrammar.TokenPrimitive(value));
break;
}
case BsonElementType.String:
{
string value = BsonTokenizer.ReadString(reader);
tokens.Add(ModelGrammar.TokenPrimitive(value));
break;
}
case BsonElementType.JavaScriptCode:
{
BsonJavaScriptCode value = (BsonJavaScriptCode)BsonTokenizer.ReadString(reader);
tokens.Add(ModelGrammar.TokenPrimitive(value));
break;
}
case BsonElementType.Symbol:
{
BsonSymbol value = (BsonSymbol)BsonTokenizer.ReadString(reader);
tokens.Add(ModelGrammar.TokenPrimitive(value));
break;
}
case BsonElementType.Document:
{
BsonTokenizer.ReadDocument(tokens, reader, false);
break;
}
case BsonElementType.Array:
{
BsonTokenizer.ReadDocument(tokens, reader, true);
break;
}
case BsonElementType.Binary:
{
BsonTokenizer.ReadBinary(tokens, reader);
break;
}
case BsonElementType.ObjectID:
{
byte[] value = reader.ReadBytes(BsonWriter.SizeOfObjectID);
tokens.Add(ModelGrammar.TokenPrimitive(new BsonObjectID(value)));
break;
}
case BsonElementType.Boolean:
{
bool value = reader.ReadByte() != BsonWriter.FalseByte;
tokens.Add(value ? ModelGrammar.TokenTrue : ModelGrammar.TokenFalse);
break;
}
case BsonElementType.DateTimeUtc:
{
DateTime value = BsonWriter.UnixEpoch.AddMilliseconds(reader.ReadInt64());
tokens.Add(ModelGrammar.TokenPrimitive(value));
break;
}
case BsonElementType.RegExp:
{
string pattern = BsonTokenizer.ReadCString(reader);
string optionsStr = BsonTokenizer.ReadCString(reader);
RegexOptions options = RegexOptions.ECMAScript;
for (int i = optionsStr.Length - 1; i >= 0; i--)
{
char ch = optionsStr[i];
switch (ch)
{
case 'g':
{
// TODO: ensure correct encoding of ^$
//options |= RegexOptions.Multiline;
break;
}
case 'i':
{
options |= RegexOptions.IgnoreCase;
break;
}
case 'm':
{
options |= RegexOptions.Multiline;
break;
}
}
}
Regex regex = new Regex(pattern, options);
tokens.Add(ModelGrammar.TokenPrimitive(regex));
break;
}
case BsonElementType.DBPointer:
{
string value1 = BsonTokenizer.ReadString(reader);
byte[] value2 = reader.ReadBytes(BsonWriter.SizeOfObjectID);
BsonDBPointer pointer = new BsonDBPointer {
Namespace = value1, ObjectID = new BsonObjectID(value2)
};
tokens.Add(ModelGrammar.TokenPrimitive(pointer));
break;
}
case BsonElementType.CodeWithScope:
{
int size = reader.ReadInt32();
string value = BsonTokenizer.ReadString(reader);
tokens.Add(ModelGrammar.TokenPrimitive(value));
BsonTokenizer.ReadDocument(tokens, reader, false);
break;
}
case BsonElementType.Int32:
{
int value = reader.ReadInt32();
tokens.Add(ModelGrammar.TokenPrimitive(value));
break;
}
case BsonElementType.TimeStamp:
{
long value = reader.ReadInt64();
// TODO: convert to TimeSpan?
tokens.Add(ModelGrammar.TokenPrimitive(value));
break;
}
case BsonElementType.Int64:
{
long value = reader.ReadInt64();
tokens.Add(ModelGrammar.TokenPrimitive(value));
break;
}
case BsonElementType.Undefined:
case BsonElementType.Null:
case BsonElementType.MinKey:
case BsonElementType.MaxKey:
{
// no data value
break;
}
default:
{
throw new DeserializationException(
String.Format(BsonTokenizer.ErrorUnexpectedElementType, elemType),
reader.BaseStream.Position);
}
}
}