internal static bool TryParseWixVariable(string value, int start, out ParsedWixVariable parsedVariable)
{
parsedVariable = null;
if (String.IsNullOrEmpty(value) || start >= value.Length)
{
return(false);
}
var startWixVariable = value.IndexOf("!(", start, StringComparison.Ordinal);
if (startWixVariable == -1)
{
return(false);
}
var firstDot = value.IndexOf('.', startWixVariable + 1);
if (firstDot == -1)
{
return(false);
}
var ns = value.Substring(startWixVariable + 2, firstDot - startWixVariable - 2);
if (ns != "loc" && ns != "bind" && ns != "wix")
{
return(false);
}
var closeParen = value.IndexOf(')', firstDot);
if (closeParen == -1)
{
return(false);
}
string name;
string scope = null;
string defaultValue = null;
var equalsDefaultValue = value.IndexOf('=', firstDot + 1, closeParen - firstDot);
var end = equalsDefaultValue == -1 ? closeParen : equalsDefaultValue;
var secondDot = value.IndexOf('.', firstDot + 1, end - firstDot);
if (secondDot == -1)
{
name = value.Substring(firstDot + 1, end - firstDot - 1);
}
else
{
name = value.Substring(firstDot + 1, secondDot - firstDot - 1);
scope = value.Substring(secondDot + 1, end - secondDot - 1);
if (!Common.IsIdentifier(scope))
{
return(false);
}
}
if (!Common.IsIdentifier(name))
{
return(false);
}
if (equalsDefaultValue != -1 && equalsDefaultValue < closeParen)
{
defaultValue = value.Substring(equalsDefaultValue + 1, closeParen - equalsDefaultValue - 1);
}
parsedVariable = new ParsedWixVariable
{
Index = startWixVariable,
Length = closeParen - startWixVariable + 1,
Namespace = ns,
Name = name,
Scope = scope,
DefaultValue = defaultValue
};
return(true);
}