private static bool GetFunction(AstRoot astRoot, ref int position, out FunctionCall functionCall, out Variable functionVariable)
{
// Note that we do not want just the deepest call since in abc(def())
// when position is over 'def' we actually want signature help for 'abc'
// while simple depth search will find 'def'.
functionVariable = null;
int p = position;
functionCall = astRoot.GetSpecificNodeFromPosition <FunctionCall>(p, (x) => {
var fc = x as FunctionCall;
// Take into account incompleted argument lists line in 'func(a|'
return(fc != null && (fc.Arguments.Contains(p) || (fc.CloseBrace == null && fc.Arguments.End == p)));
});
if (functionCall == null && position > 0)
{
// Retry in case caret is at the very end of function signature
// that does not have final close brace yet.
functionCall = astRoot.GetNodeOfTypeFromPosition <FunctionCall>(position - 1, includeEnd: true);
if (functionCall != null)
{
// But if signature does have closing brace and caret
// is beyond it, we are really otuside of the signature.
if (functionCall.CloseBrace != null && position >= functionCall.CloseBrace.End)
{
return(false);
}
if (position > functionCall.SignatureEnd)
{
position = functionCall.SignatureEnd;
}
}
}
if (functionCall != null && functionCall.Children.Count > 0)
{
functionVariable = functionCall.Children[0] as Variable;
if (functionVariable == null)
{
// Might be in a namespace
var op = functionCall.Children[0] as IOperator;
if (op != null && op.OperatorType == OperatorType.Namespace)
{
functionVariable = op.RightOperand as Variable;
}
}
return(functionVariable != null);
}
return(false);
}
/// <summary>
/// Finds the outermost function call from given position.
/// In abc(def()) when position is over 'def' finds 'abc'
/// </summary>
public static bool GetOuterFunction(this AstRoot astRoot, ref int position, out FunctionCall functionCall, out Variable functionVariable)
{
functionVariable = null;
var p = position;
functionCall = astRoot.GetSpecificNodeFromPosition <FunctionCall>(p, x => {
if (x is FunctionCall fc && fc.OpenBrace.End <= p)
{
if (fc.CloseBrace != null)
{
return(p <= fc.CloseBrace.Start); // between ( and )
}
// Take into account incomplete argument lists line in 'func(a|'
return(fc.Arguments.End == p);
}
return(false);
});