private IExpression ParseStringInterpolation(string text)
{
IList <IExpression> expressions = new List <IExpression>();
while (true)
{
int pos = text.IndexOf('$');
if (pos < 0)
{
if (!string.IsNullOrEmpty(text))
{
IExpression textexpr = new ConstantExpression(text);
expressions.Add(textexpr);
}
break;
}
if (pos == text.Length - 1)
{
throw new ParserException("Unexpected End of String");
}
string left = text.Substring(0, pos);
if (!string.IsNullOrEmpty(left))
{
expressions.Add(new ConstantExpression(left));
}
if (text[pos + 1] == '{')
{
int pos2 = text.IndexOf('}', pos + 1);
if (pos2 < 0)
{
throw new ParserException("Unexpected End of String");
}
string subtext = text.Substring(pos + 2, pos2 - pos - 2);
text = text.Substring(pos2 + 1);
Parser parser = new Parser(subtext);
IExpression newexpr = parser.ParseExpression();
if (parser.ParseExpression() != null)
{
throw new ParserException("Bad String Interpolation");
}
expressions.Add(newexpr);
}
else if (char.IsLetter(text[pos + 1]))
{
Parser parser = new Parser(text.Substring(pos + 1));
string name = parser.ParseName();
IExpression varexpr = new VariableExpression(name);
expressions.Add(varexpr);
text = text.Substring(pos + name.Length + 1);
}
else
{
throw new ParserException("Bad String Interpolation");
}
}
if (expressions.Count == 1)
{
return(expressions[0]);
}
IExpression expression = expressions[0];
foreach (var expr in expressions.Skip(1))
{
expression = new ArithmeticBinaryExpression(ArithmeticOperator.Add, expression, expr);
}
return(expression);
}
private IExpression ParseStringInterpolation(string text)
{
IList<IExpression> expressions = new List<IExpression>();
while (true)
{
int pos = text.IndexOf('$');
if (pos < 0)
{
if (!string.IsNullOrEmpty(text))
{
IExpression textexpr = new ConstantExpression(text);
expressions.Add(textexpr);
}
break;
}
if (pos == text.Length - 1)
throw new ParserException("Unexpected End of String");
string left = text.Substring(0, pos);
if (!string.IsNullOrEmpty(left))
expressions.Add(new ConstantExpression(left));
if (text[pos + 1] == '{')
{
int pos2 = text.IndexOf('}', pos + 1);
if (pos2 < 0)
throw new ParserException("Unexpected End of String");
string subtext = text.Substring(pos + 2, pos2 - pos - 2);
text = text.Substring(pos2 + 1);
Parser parser = new Parser(subtext);
IExpression newexpr = parser.ParseExpression();
if (parser.ParseExpression() != null)
throw new ParserException("Bad String Interpolation");
expressions.Add(newexpr);
}
else if (char.IsLetter(text[pos + 1]))
{
Parser parser = new Parser(text.Substring(pos + 1));
string name = parser.ParseName();
IExpression varexpr = new VariableExpression(name);
expressions.Add(varexpr);
text = text.Substring(pos + name.Length + 1);
}
else
throw new ParserException("Bad String Interpolation");
}
if (expressions.Count == 1)
return expressions[0];
IExpression expression = expressions[0];
foreach (var expr in expressions.Skip(1))
expression = new ArithmeticBinaryExpression(ArithmeticOperator.Add, expression, expr);
return expression;
}
