private JsonBufferReader(JsonBuffer buffer, int index)
{
if (buffer.IsEmpty)
throw new ArgumentException("buffer");
Debug.Assert(index >= -1);
Debug.Assert(index < buffer.Length);
_buffer = buffer;
_index = index;
}
public NamedJsonBuffer(string name, JsonBuffer buffer)
{
if (name == null)
throw new ArgumentNullException("name");
if (buffer.IsEmpty)
throw new ArgumentException(null, "buffer");
_name = Mask.NullString(name);
_buffer = buffer;
}
static JsonBuffer()
{
JsonBuffer buffer = new JsonBufferStorage(5) // [null,true,false]
.Write(JsonToken.Array())
.Write(JsonToken.Null(), JsonToken.True(), JsonToken.False())
.Write(JsonToken.EndArray())
.ToBuffer();
_null = buffer.Slice(1, 2);
_true = buffer.Slice(2, 3);
_false = buffer.Slice(3, 4);
}
public JsonBuffer[] GetArray()
{
JsonBuffer[] values = new JsonBuffer[GetArrayLength()];
GetArray(values);
return values;
}
public void StringRepresentationForFalse()
{
Assert.AreEqual("false", JsonBuffer.From(JsonToken.False()).ToString());
}
public void StringRepresentationForNumber()
{
Assert.AreEqual("42", JsonBuffer.From(JsonToken.Number("42")).ToString());
}
public void StringRepresentationForNull()
{
Assert.AreEqual("null", JsonBuffer.From(JsonToken.Null()).ToString());
}
public void OpInequality()
{
Assert.IsTrue(JsonBuffer.From("[1,2,three,4]") != JsonBuffer.From("[1,2,THREE,4]"));
}
public void GetArrayLength()
{
Assert.AreEqual(3, JsonBuffer.From("[1,2,3]").GetArrayLength());
}
public void GetArrayShort()
{
JsonBuffer[] values = new JsonBuffer[2];
int count = JsonBuffer.From("[1,2,3]").GetArray(values);
Assert.AreEqual(~2, count);
Assert.AreEqual(1, (int)values[0].GetNumber());
Assert.AreEqual(2, (int)values[1].GetNumber());
}
public void GetArrayLong()
{
JsonBuffer[] values = new JsonBuffer[4];
int count = JsonBuffer.From("[1,2,3]").GetArray(values);
Assert.AreEqual(3, count);
Assert.AreEqual(1, (int)values[0].GetNumber());
Assert.AreEqual(2, (int)values[1].GetNumber());
Assert.AreEqual(3, (int)values[2].GetNumber());
Assert.IsTrue(values[3].IsEmpty);
}
public JsonBufferReader(JsonBuffer buffer) :
this(buffer, -1)
{
}
protected override JsonToken ReadTokenImpl()
{
JsonReader baseReader = _reader;
int index = _index;
if (index < 0)
{
//
// If the base reader was never started then do it now.
// Check for zero depth is the same as BOF.
//
if (baseReader.Depth == 0)
{
baseReader.ReadToken(JsonTokenClass.Object);
_innerDepth = baseReader.Depth;
}
_index = 0;
return(JsonToken.Object());
}
//
// Buffered members, if any, get served first.
//
NamedJsonBufferList bufferedMembers = _bufferedMembers;
if (bufferedMembers != null && index < bufferedMembers.Count)
{
//
// Is there a value to serve?
//
JsonBuffer value = _memberValue;
if (!value.IsEmpty)
{
if (value.IsStructured) // JSON Array or Object
{
//
// Get a reader on the structured (array or
// object) value if not already acquired.
//
JsonReader valueReader = _memberStructuredValueReader;
if (valueReader == null)
{
valueReader = _memberStructuredValueReader = value.CreateReader();
}
//
// Serve tokens from the value reader until OEF.
//
if (valueReader.Read())
{
return(valueReader.Token);
}
//
// Proceed with next.
//
_memberValue = JsonBuffer.Empty;
_memberStructuredValueReader = null;
_index++;
return(ReadTokenImpl());
}
else // JSON Null, Boolean, Number or String
{
Debug.Assert(value.IsNull || value.IsScalar);
//
// Establish state to proceed with next and
// serve token pertaining to scalar value.
//
_memberValue = JsonBuffer.Empty;
_index++;
return(value.IsNull
? JsonToken.Null()
: value.CreateReader().Token);
}
}
//
// Serve buffered member name and establish state so
// that the value will be served next.
//
NamedJsonBuffer member = (NamedJsonBuffer)bufferedMembers[index];
_memberValue = member.Buffer;
return(JsonToken.Member(member.Name));
}
//
// Done with buffered members so now move on to remaining
// members from the underlying reader.
//
if (baseReader == null)
{
return(JsonToken.EOF()); // Done with serving
}
//
// If base reader is on the object end at the same depth as
// on entry then serve the last end token. The reader is
// released so that on next read, the above will signal EOF.
//
if (baseReader.Depth == _innerDepth &&
baseReader.TokenClass == JsonTokenClass.EndObject)
{
_reader = null;
}
//
// Move through the base reader.
//
JsonToken token = baseReader.Token;
baseReader.Read();
return(token);
}
/// <summary>
/// Attempts to locate a member with a given (case-sensitive) name
/// and returns a <see cref="JsonReader"/> that can be used to read
/// the value. Otherwise it returns <c>null</c>.
/// </summary>
/// <remarks>
/// The caller should not use the returned <see cref="JsonReader"/>
/// instance for any other purpose but reading the value. It is
/// possible that this method will return the same instance as
/// <see cref="BaseReader"/> or a separate instance.
/// </remarks>
public JsonReader TryReadMember(string name)
{
//
// Is the member already buffered? If yes then return a reader
// on its buffered value.
//
JsonBuffer value = TryPopBufferedMember(name);
if (!value.IsEmpty)
{
return(value.CreateReader());
}
//
// Use the base reader from here on if it has not already been
// exhausted...
//
if (_ended)
{
return(null);
}
JsonReader reader = BaseReader;
if (!_started)
{
_started = true;
if (!reader.MoveToContent())
{
throw new JsonException(string.Format(
@"Unexpected EOF while attempting to look for member named '{0}'.",
name));
}
JsonTokenClass clazz = reader.TokenClass;
if (clazz != JsonTokenClass.Object &&
clazz != JsonTokenClass.Member)
{
throw new JsonException(string.Format(
@"Found {0} where a JSON Object or Member was expected.", clazz));
}
}
//
// If the base reader is sitting on the start of an object then
// move into it. This case should only arise on the first read
// into a JSON object.
//
if (reader.TokenClass == JsonTokenClass.Object)
{
reader.Read();
}
//
// Go over the entire JSON object until its end.
//
while (reader.TokenClass != JsonTokenClass.EndObject)
{
//
// Read the next member and if it matches what's being
// sought then simply return the base reader that
// should be aligned on the value.
//
string actualName = reader.ReadMember();
if (string.CompareOrdinal(actualName, name) == 0)
{
return(reader);
}
//
// Not the sought member so buffer it to be served
// later when it is sought or as part of the tail.
//
NamedJsonBufferList members = _members;
if (members == null)
{
members = _members = new NamedJsonBufferList(4);
}
members.Add(new NamedJsonBuffer(actualName, JsonBuffer.From(reader)));
}
_ended = true;
//
// Member not found.
//
return(null);
}
public void CannotBeInitializedWithNullName()
{
new NamedJsonBuffer(null, JsonBuffer.From("null"));
}
public int GetArray(JsonBuffer[] values, int index, int count)
{
if (index < 0)
throw new ArgumentOutOfRangeException("index", index, null);
JsonBufferReader reader = CreateReader();
if (!reader.MoveToContent())
throw new JsonException("Unexpected EOF.");
if (reader.TokenClass == JsonTokenClass.Null)
return 0;
reader.ReadToken(JsonTokenClass.Array);
int readCount = 0;
while (reader.TokenClass != JsonTokenClass.EndArray)
{
if (count-- == 0)
return ~readCount;
if (values != null)
values[index++] = reader.BufferValue();
else
reader.Skip();
readCount++;
}
return readCount;
}
public void AnonymousToString()
{
Assert.AreEqual("(anonymous): \"foo\"",
new NamedJsonBuffer(string.Empty, JsonBuffer.From("foo")).ToString());
}
public void GetArrayLengthOnNull()
{
Assert.AreEqual(0, JsonBuffer.From("[null]").GetArray()[0].GetArrayLength());
}
public void StringRepresentation()
{
string str = JsonBuffer.From("[42,foobar,null,true,false,{x:123,y:456}]").ToString();
Assert.AreEqual("[42,\"foobar\",null,true,false,{\"x\":123,\"y\":456}]", str);
}
public void GetMemberCount()
{
Assert.AreEqual(3, JsonBuffer.From("{a:1,b:2,c:3}").GetMemberCount());
}
public void StringRepresentationForString()
{
Assert.AreEqual("\"foo\\nbar\"", JsonBuffer.From(JsonToken.String("foo\nbar")).ToString());
}
public void GetMembersIntoArrayPermitsNull()
{
Assert.AreEqual(3, JsonBuffer.From("{a:1,b:2,c:3}").GetMembers(null));
}
public void StringRepresentationForTrue()
{
Assert.AreEqual("true", JsonBuffer.From(JsonToken.True()).ToString());
}
public void GetMembersCountOnNull()
{
Assert.AreEqual(0, JsonBuffer.From("[null]").GetArray()[0].GetMemberCount());
}
public JsonBufferReader(JsonBuffer buffer)
: this(buffer, -1)
{
}
public void IsObject()
{
Assert.IsTrue(JsonBuffer.From("{}").IsObject);
}
protected override JsonToken ReadTokenImpl()
{
JsonReader baseReader = _reader;
int index = _index;
if (index < 0)
{
//
// If the base reader was never started then do it now.
// Check for zero depth is the same as BOF.
//
if (baseReader.Depth == 0)
{
baseReader.ReadToken(JsonTokenClass.Object);
_innerDepth = baseReader.Depth;
}
_index = 0;
return JsonToken.Object();
}
//
// Buffered members, if any, get served first.
//
NamedJsonBufferList bufferedMembers = _bufferedMembers;
if (bufferedMembers != null && index < bufferedMembers.Count)
{
//
// Is there a value to serve?
//
JsonBuffer value = _memberValue;
if (!value.IsEmpty)
{
if (value.IsStructured) // JSON Array or Object
{
//
// Get a reader on the structured (array or
// object) value if not already acquired.
//
JsonReader valueReader = _memberStructuredValueReader;
if (valueReader == null)
valueReader = _memberStructuredValueReader = value.CreateReader();
//
// Serve tokens from the value reader until OEF.
//
if (valueReader.Read())
return valueReader.Token;
//
// Proceed with next.
//
_memberValue = JsonBuffer.Empty;
_memberStructuredValueReader = null;
_index++;
return ReadTokenImpl();
}
else // JSON Null, Boolean, Number or String
{
Debug.Assert(value.IsNull || value.IsScalar);
//
// Establish state to proceed with next and
// serve token pertaining to scalar value.
//
_memberValue = JsonBuffer.Empty;
_index++;
return value.IsNull
? JsonToken.Null()
: value.CreateReader().Token;
}
}
//
// Serve buffered member name and establish state so
// that the value will be served next.
//
NamedJsonBuffer member = (NamedJsonBuffer) bufferedMembers[index];
_memberValue = member.Buffer;
return JsonToken.Member(member.Name);
}
//
// Done with buffered members so now move on to remaining
// members from the underlying reader.
//
if (baseReader == null)
return JsonToken.EOF(); // Done with serving
//
// If base reader is on the object end at the same depth as
// on entry then serve the last end token. The reader is
// released so that on next read, the above will signal EOF.
//
if (baseReader.Depth == _innerDepth
&& baseReader.TokenClass == JsonTokenClass.EndObject)
{
_reader = null;
}
//
// Move through the base reader.
//
JsonToken token = baseReader.Token;
baseReader.Read();
return token;
}
public void IsArray()
{
Assert.IsTrue(JsonBuffer.From("[]").IsArray);
}
public bool Equals(JsonBuffer other)
{
if (Length != other.Length)
return false;
for (int i = 0; i < Length; i++)
{
if (!this[i].Equals(other[i]))
return false;
}
return true;
}
public void Equality()
{
Assert.AreEqual(JsonBuffer.From("[1,2,3]"), JsonBuffer.From("[1,2,3]"));
}
public int GetArray(JsonBuffer[] values)
{
return GetArray(values, 0, values.Length);
}
public void Inequality()
{
Assert.AreNotEqual(JsonBuffer.From("[1,2,three,4]"), JsonBuffer.From("[1,2,THREE,4]"));
}
public void OpEquality()
{
Assert.IsTrue(JsonBuffer.From("[1,2,3]") == JsonBuffer.From("[1,2,3]"));
}
public JsonBuffer[] GetArray()
{
JsonBuffer[] values = new JsonBuffer[GetArrayLength()];
GetArray(values);
return(values);
}
