public SingleExpression(TextReader reader)
{
while (reader.Peek() != -1)
{
char c = (char)reader.Peek();
if (c == '(')
{
reader.Read();
Expression = new SingleExpression(reader);
if ((char)reader.Read() != ')')
{
throw new Exception("Expected )");
}
}
else if (c == ')')
{
return;
}
else if (c == '[')
{
reader.Read();
Expression = new RangeExpression(reader);
if ((char)reader.Read() != ']')
{
throw new Exception("Expected ]");
}
}
else if (c == '{')
{
reader.Read();
Expression = new RepeatExpression(reader)
{
Expression = Expression
};
if ((char)reader.Read() != '}')
{
throw new Exception("Expected }");
}
}
else if (c == '|')
{
reader.Read();
Expression = new OrExpression {
Left = Expression, Right = new SingleExpression(reader)
};
}
else if (c == '.')
{
reader.Read();
Expression = new ConcatExpression {
Left = Expression, Right = new SingleExpression(reader).Expression
};
}
else if (c == '*')
{
reader.Read();
Expression = new StarExpression {
Expression = Expression
};
}
else if (c == '+')
{
reader.Read();
Expression = new PlusExpression {
Expression = Expression
};
}
else
{
throw new Exception("Unexpected " + c);
}
}
}
public SingleExpression(TextReader reader)
{
while (reader.Peek() != -1)
{
char c = (char)reader.Peek();
if (c == '(')
{
reader.Read();
Expression = new SingleExpression(reader);
if ((char)reader.Read() != ')')
throw new Exception("Expected )");
}
else if (c == ')')
{
return;
}
else if (c == '[')
{
reader.Read();
Expression = new RangeExpression(reader);
if ((char)reader.Read() != ']')
throw new Exception("Expected ]");
}
else if (c == '{')
{
reader.Read();
Expression = new RepeatExpression(reader) { Expression = Expression };
if ((char)reader.Read() != '}')
throw new Exception("Expected }");
}
else if (c == '|')
{
reader.Read();
Expression = new OrExpression { Left = Expression, Right = new SingleExpression(reader) };
}
else if (c == '.')
{
reader.Read();
Expression = new ConcatExpression { Left = Expression, Right = new SingleExpression(reader).Expression };
}
else if (c == '*')
{
reader.Read();
Expression = new StarExpression { Expression = Expression };
}
else if (c == '+')
{
reader.Read();
Expression = new PlusExpression { Expression = Expression };
}
else
{
throw new Exception("Unexpected " + c);
}
}
}