VsExpression ParseWithSimpleFormatter(string expression)
{
string formatSpecifier = "";
string value = expression;
int lastComma = expression.LastIndexOf(',');
if (lastComma > 0)
{
string formatCandidate = expression.Substring(lastComma + 1).Trim();
if (RemoteValueFormatProvider.IsValidFormat(formatCandidate))
{
formatSpecifier = formatCandidate;
value = expression.Substring(0, lastComma);
}
}
return(new VsExpression(value, new FormatSpecifier(formatSpecifier)));
}
/// <summary>
/// Tries to split the |expression| input into valid formatter suffix and a candidate
/// for an expression with an expression size specifier (i.e., size specifier of the form
/// [<expr>].
///
/// Note that the method does not ensure validity of |prefixWithSizeSpecifier|, it only
/// splits based on a valid suffix (|baseFormatter|).
///
/// Returns false if it cannot find a right bracket followed by a valid formatter suffix.
/// </summary>
bool TrySplitSizeSpecifierPrefix(string expression, out string prefixWithSizeSpecifier,
out string baseFormatter)
{
prefixWithSizeSpecifier = "";
baseFormatter = "";
int rightSquareIndex = expression.LastIndexOf(']');
// If there is no right square bracket, it cannot be an expression size specifier.
if (rightSquareIndex == -1)
{
return(false);
}
// If we have a right bracket, try to see if the rest of the potential formatter
// is a valid suffix.
string suffix = expression.Substring(rightSquareIndex + 1);
if (RemoteValueFormatProvider.IsValidSizeSpecifierSuffix(suffix))
{
prefixWithSizeSpecifier = expression.Substring(0, rightSquareIndex + 1);
baseFormatter = suffix;
return(true);
}
return(false);
}