/// <summary>
/// Select the nodes from the GUI Model xPath select in the script context
/// con.
/// </summary>
/// <param name="con">The script context who's model to use</param>
/// <param name="select">Gui Model xPath to model nodes</param>
/// <param name="source">Text to identify the source instruction in asserts</param>
/// <returns>A list of model nodes matching the query</returns>
static public XmlNodeList selectNodes(Context con, string select, string source)
{
XmlNodeList nodes = null;
// try to dereference variables in the select expression
string evalSelect = Utilities.evalExpr(select);
if (con.ModelNode != null)
{ // Search from the current model context
XmlNode current = con.ModelNode.ModelNode;
Logger.getOnly().isNotNull(current, source + " context model node is null, parent may not have @select");
XmlNamespaceManager nsmgr = new XmlNamespaceManager(current.OwnerDocument.NameTable);
//m_log.paragraph("Selecting from model context=" + current.Name);
nodes = current.SelectNodes(evalSelect, nsmgr);
}
else
{ // Search from the model root
OnApplication apCon = null;
if (typeof(OnApplication).IsInstanceOfType(con))
apCon = (OnApplication)con;
else
apCon = (OnApplication)con.Ancestor(typeof(OnApplication));
Logger.getOnly().isNotNull(apCon, "No on-application context found for " + source + "select to get a model from");
XmlElement root = apCon.ModelRoot;
Logger.getOnly().isNotNull(root, "GUI model of " + source + "select has no root");
// preprocess select for special variables like $name; if there is a model node
//m_log.paragraph("Selecting from model context=" + root.Name);
nodes = root.SelectNodes(evalSelect);
}
return nodes;
}
/// <summary>
/// Executes this context with its instructions.
/// Child instructions are converted from XML the first time this is called.
/// Each instruction is executed in turn so that
/// the instruction tree is traversed depth-first.
/// </summary>
public override void Execute()
{
base.Execute();
if (m_instructions.Count == 0 && !(this is Model))
{
PrepareChildren();
}
// Execute the child instructions
// Insertions may be made by expansion of some instructions into
// multiple instructions (via @select) so iterators and foreach can't be used.
int count = 0;
if (count < m_instructions.Count)
{
SetContextVariables();
Instruction inst = (Instruction)m_instructions[count];
while (inst != null)
{
if (!inst.Finished)
{
inst.Execute();
}
count += 1;
if (count < m_instructions.Count)
{
inst = (Instruction)m_instructions[count];
}
else
{
inst = null;
}
}
// reinstate the parent context's variables
Context con = (Context)Ancestor(typeof(Context));
if (con != null)
{
con.SetContextVariables();
}
if (con is OnApplication)
{ // refress the process data for the application
OnApplication app = (OnApplication)con;
Process proc = app.Application.Process;
m_log.paragraph("Application process refreshed.");
}
}
//Logger.getOnly().result(this); derivative classes call this after processing results
}
