private IOperation parseVar()
{
Operations.OperationVariableAccess va = new Operations.OperationVariableAccess();
var cc = _reader.Peek();
bool blockMode = (cc == '{');
StringBuilder sb = new StringBuilder();
if (!blockMode)
{
while ((cc = _reader.Peek()) != -1)
{
var ch = (char)cc;
if (!char.IsLetterOrDigit(ch) && _parser._tokenSpecialCharacters.IndexOf(ch) == -1)
{
break;
}
sb.Append(ch);
_reader.Read();
}
va.AddName(sb.ToString());
return(new Operations.OperationExpression(new IOperation[] { va }));
}
_reader.Read(); // Read {
var v = _parser.ParseMulti(_reader);
_reader.SkipWhiteSpaceAndComments();
_reader.ReadAndThrowIfNot('}'); // eat }
return(v);
}
/// Parse multi-expression, like ${a|b|=2+3}
public IOperation ParseMulti(ParsingReader reader)
{
Operations.OperationVariableAccess va = new Operations.OperationVariableAccess();
StringBuilder sb = new StringBuilder();
bool orMet = true;
int n;
while ((n = reader.Peek()) != -1)
{
var q = (char)n;
if (q == '}' || q == ')' || q == ']')
{
break;
}
switch (q)
{
case '|':
reader.Read();
va.AddName(sb.ToString());
sb.Length = 0;
orMet = true;
break;
case '\'':
case '\"':
case '`':
orMet = false;
if (sb.Length != 0)
{
reader.ThrowParsingException("Quote must be a first character");
}
va.AddValue(reader.ReadQuote());
reader.SkipWhiteSpaceAndComments();
if (reader.Peek() != '}' && reader.Peek() != '|')
{
reader.ThrowParsingException("Unexpected character '" + (char)reader.Peek() + "'");
}
sb.Length = 0;
break;
case '=':
orMet = false;
reader.Read();
var v = Parse(reader);
if (v != null)
{
va.AddExpression(v);
}
else
{
va.AddValue(null);
}
break;
default:
orMet = false;
sb.Append(q);
reader.Read();
break;
}
}
if (sb.Length > 0 || orMet)
{
va.AddName(sb.ToString());
}
return(va);
}