private JsonValue ParseObject(ICharReader charReader)
{
var members = new List <JsonObjectMember>();
if (!charReader.TrimRead('{'))
{
throw new JsonException("Expected '{' when parsing json object.");
}
var peek = charReader.TrimThenPeek();
if (!peek.HasValue)
{
throw new JsonException("Unterminated object");
}
while (peek.Value != '}')
{
if (members.Any())
{
if (!charReader.TrimRead(','))
{
throw new JsonException("Missing comma separater between array items.");
}
}
members.Add(ParseObjectMember(charReader));
peek = charReader.TrimThenPeek();
if (!peek.HasValue)
{
throw new JsonException("Unterminated object");
}
}
charReader.Read(); // }
return(new JsonObject(members));
}
private JsonValue ParseArray(ICharReader charReader)
{
charReader.TrimRead(); // [
var items = new List <JsonValue>();
while (charReader.TrimThenPeek() != ']')
{
if (items.Any())
{
if (!charReader.TrimRead(','))
{
throw new JsonException("Missing comma separater between array items.");
}
}
items.Add(ParseJsonValue(charReader));
}
charReader.Read(); // ]
return(new JsonArray(items));
}
private JsonValue ParseJsonValue(ICharReader charReader)
{
var leadingCharacter = charReader.TrimThenPeek();
if (!leadingCharacter.HasValue)
{
throw new JsonException("Unexpected end of stream");
}
var valueType = IdentifyValueType(leadingCharacter.Value);
switch (valueType)
{
case JsonValueType.String:
return(ParseString(charReader));
case JsonValueType.Number:
return(ParseNumber(charReader));
case JsonValueType.Object:
return(ParseObject(charReader));
case JsonValueType.Array:
return(ParseArray(charReader));
case JsonValueType.True:
return(ParseTrue(charReader));
case JsonValueType.False:
return(ParseFalse(charReader));
case JsonValueType.Null:
return(ParseNull(charReader));
case JsonValueType.Unrecognised:
throw new JsonException($"Unexpected character '{leadingCharacter.Value}'");
default:
throw new ArgumentOutOfRangeException(nameof(valueType), valueType, null);
}
}