/// <summary>
/// Parses the token after all whitespace characters were consumed.
/// <para>
/// It must be guaranteed that the first character read is
/// <list type="bullet">
/// <item>a non-whitespace character</item>
/// <item>not EOF (int value -1</item>
/// </list>
/// </para>
/// </summary>
/// <returns></returns>
/// <exception cref="JsonLexerException"></exception>
private JsonToken DoParseNextToken()
{
reader.Mark(1);
var nextChar = (char)reader.Read();
switch (nextChar)
{
case JsonLexerConstants.LeftSquareBracket:
return(JsonToken.LeftSquareBracketToken);
case JsonLexerConstants.RightSquareBracket:
return(JsonToken.RightSquareBracketToken);
case JsonLexerConstants.LeftBrace:
return(JsonToken.LeftBraceToken);
case JsonLexerConstants.RightBrace:
return(JsonToken.RightBraceToken);
case JsonLexerConstants.Colon:
return(JsonToken.ColonToken);
case JsonLexerConstants.Comma:
return(JsonToken.CommaToken);
case JsonLexerConstants.TrueLiteralStart: // fallthrough
case JsonLexerConstants.FalseLiteralStart:
// could be boolean literal (true|false)
reader.Reset();
return(TryParseBooleanLiteral());
case JsonLexerConstants.NullLiteralStart:
reader.Reset();
return(TryParseNullLiteral());
case JsonLexerConstants.QuotationMark:
return(TryParseStringToken());
default:
{
// check if it is a number or a completely unknown token
if (IsDigitOrMinus(nextChar))
{
reader.Reset();
return(TryParseNumberToken());
}
reader.Reset();
var literalToken = ParseLiteral();
throw new JsonLexerException(UnexpectedLiteralTokenMessage(literalToken));
}
}
}
/// <summary> /// あらかじめ印をつけておいた文字位置に戻ります。 /// まだ<see cref="Mark"/>が呼び出された実績がない場合、このメソッドは何も行わず、例外もスローしません。 /// </summary> public void Reset() => _inner.Reset(false);
