protected void init()
{
expression = new ConditionalExpression(this, script, msbuild);
}
/// <summary>
/// To extract conditional expression.
/// </summary>
protected virtual string extractExpression(string raw, out string expression)
{
string ret = String.Empty;
raw = RawExp.Replace(raw, delegate(Match m)
{
ret = m.Groups[1].Value;
return "(expression)";
}, 1);
expression = ret;
return raw;
}