public void GetPositionNodeTest()
{
AstRoot ast = RParser.Parse(new TextStream(" x <- a+b"));
IAstNode scope;
IAstNode variable;
ast.GetPositionNode(0, out scope);
scope.Should().BeAssignableTo <IScope>();
scope.GetPositionNode(1, out variable);
variable.Should().BeOfType <Variable>();
}
/// <summary>
/// Given position over function name retrieves name range and the function call.
/// </summary>
public static string GetFunctionName(this AstRoot ast, int position, out FunctionCall functionCall, out Variable functionVariable)
{
functionVariable = null;
functionCall = null;
ast.GetPositionNode(position, out var node);
if (node == null)
{
return(null);
}
// In abc(de|f(x)) first find inner function, then outer.
if (node is TokenNode && node.Parent is FunctionCall)
{
functionCall = (FunctionCall)node.Parent;
}
else
{
functionCall = ast.GetNodeOfTypeFromPosition <FunctionCall>(position);
}
functionVariable = functionCall?.RightOperand as Variable;
return(functionVariable?.Name);
}