private static string ParseDictionaryKey(ExpressionReader reader)
{
reader.Read(); //Skip {
var key = new StringBuilder();
while (reader.Peek() != -1 && reader.PeekChar() != '}')
{
key.Append(reader.ReadChar());
}
if (key.Length == 0)
{
throw reader.UnexpectedCharacterException();
}
if (reader.Read() != '}')
{
throw reader.UnexpectedCharacterException();
}
reader.SkipWhitespace();
return(key.ToString());
}
public static char ReadChar(this ExpressionReader reader)
{
if (reader == null)
{
throw new ArgumentNullException(nameof(reader));
}
return((char)reader.Read());
}
public static void SkipWhitespace(this ExpressionReader reader)
{
if (reader == null)
{
throw new ArgumentNullException(nameof(reader));
}
while (char.IsWhiteSpace(reader.PeekChar()))
{
reader.Read();
}
}
private static ComparisonOperator ParseOperator(ExpressionReader reader)
{
var c = reader.ReadChar();
if (c == '=' && reader.PeekChar() == '=')
{
reader.Read();
return(ComparisonOperator.Equal);
}
if (c == '!' && reader.PeekChar() == '=')
{
reader.Read();
return(ComparisonOperator.NotEqual);
}
if (c == '>' && reader.PeekChar() == '=')
{
reader.Read();
return(ComparisonOperator.GreaterThanOrEqual);
}
if (c == '<' && reader.PeekChar() == '=')
{
reader.Read();
return(ComparisonOperator.LessThanOrEqual);
}
if (c == '>')
{
return(ComparisonOperator.GreaterThan);
}
if (c == '<')
{
return(ComparisonOperator.LessThan);
}
throw reader.UnexpectedCharacterException();
}
private static IReadOnlyCollection <IBooleanExpression> ParseGroup(ExpressionReader reader)
{
reader.Read(); //Skip (
reader.SkipWhitespace();
var result = ParseBooleanExpressions(reader, BooleanOperator.And).ToArray();
reader.SkipWhitespace();
var c = reader.ReadChar();
if (c != ')')
{
throw reader.UnexpectedCharacterException();
}
return(result);
}
private static string ParseDefaultValue(ExpressionReader reader)
{
if (reader.PeekChar() != '|')
{
return(null);
}
reader.Read();
if (reader.PeekChar() == '\'')
{
return(ConstantParser.Parse(reader));
}
var value = new StringBuilder();
while (IsValidDefaultChar(reader.PeekChar()))
{
value.Append(reader.ReadChar());
}
return(value.ToString());
}
