string GetSignatures(string json)
{
PosData posData = GetPosData(json);
if (posData == null)
{
return(null);
}
MethodNode methodNode = null;
SignatureHelp signatures = null;
int methodIndex = 0;
int parameterIndex;
if (posData.SelectedNode != null)
{
// Get the signature for the method the cursor is on.
// Check if the selected node is a method node.
if (posData.SelectedNode.ElementAtOrDefault(0) is MethodNode)
{
methodNode = (MethodNode)posData.SelectedNode[0];
// If the parameters of the method node is not selected and the parent is a method node,
// select the parent method node.
if (!methodNode.IsParametersSelected(posData.Caret) && posData.SelectedNode.ElementAtOrDefault(1) is MethodNode)
{
methodNode = (MethodNode)posData.SelectedNode[1];
// Get the index of the selected node.
parameterIndex = Array.IndexOf(methodNode.Parameters, posData.SelectedNode[0]);
}
else
{
if (methodNode.IsNameSelected(posData.Caret))
{
// If the name is selected, -1 will not highlight any parameters.
parameterIndex = -1;
}
else
{
// The last parameter is selected.
parameterIndex = methodNode.Parameters.Length;
}
}
}
else if (/*parser.Bav.SelectedNode.ElementAtOrDefault(0) is IExpressionNode
* &&*/posData.SelectedNode.ElementAtOrDefault(1) is MethodNode)
{
methodNode = (MethodNode)posData.SelectedNode[1];
// Get the index of the selected node.
parameterIndex = Array.IndexOf(methodNode.Parameters, posData.SelectedNode[0]);
}
else
{
parameterIndex = 0;
}
SignatureInformation information = null;
if (methodNode != null)
{
IMethod method = parserData.GetMethod(methodNode.Name);
if (method != null)
{
ParameterInformation[] parameterInfo = new ParameterInformation[method.Parameters.Length];
for (int i = 0; i < parameterInfo.Length; i++)
{
parameterInfo[i] = new ParameterInformation(
method.Parameters[i].GetLabel(false),
// Every value in the tree can potentially be null.
method.Wiki?.Parameters?.ElementAtOrDefault(i)?.Description
);
}
information = new SignatureInformation(
method.GetLabel(false),
// Get the method's documentation
method.Wiki?.Description,
// Get the parameter data
parameterInfo
//method.Wiki?.Parameters?.Select(v => v.ToParameterInformation())
// .ToArray()
);
}
}
signatures = new SignatureHelp
(
new SignatureInformation[] { information },
methodIndex,
parameterIndex
);
}
return(JsonConvert.SerializeObject(signatures));
}
