/// <summary>
/// Adds a function to the current value with the given name.
/// </summary>
/// <param name="name">The name of the function.</param>
public void AddFunction(String name)
{
var function = new FunctionBuffer(name);
function.StartIndex = _values.Count;
_functions.Push(function);
}
/// <summary>
/// Tries to load a function from a given file.
/// </summary>
/// <param name="symbolName">The name of the function (equals the name of the file).</param>
/// <returns>The function (if found) or NULL.</returns>
public override IFunction LoadFunction(String symbolName)
{
if (!Parser.UseScripting)
{
return(null);
}
var script = String.Empty;
var function = new FunctionBuffer
{
Directory = Environment.CurrentDirectory,
FunctionName = symbolName
};
if (!File.Exists(function.FileName))
{
return(null);
}
for (var i = buffer.Count - 1; i >= 0; i--)
{
if (!buffer[i].Directory.Equals(Environment.CurrentDirectory, StringComparison.CurrentCultureIgnoreCase))
{
buffer.RemoveAt(i);
}
}
var original = buffer
.Where(m => m.FileName.Equals(function.FileName, StringComparison.CurrentCultureIgnoreCase))
.FirstOrDefault();
try
{
function.LastUpdated = File.GetLastWriteTime(function.FileName);
if (original != null)
{
if (function.LastUpdated.CompareTo(original.LastUpdated) <= 0)
{
return(original.Lookup());
}
buffer.Remove(original);
}
script = File.ReadAllText(function.FileName);
}
catch
{
if (buffer != null)
{
return(original.Lookup());
}
return(null);
}
if (!String.IsNullOrEmpty(script))
{
function.Context = new ParseContext(parent);
var p = Parser.Parse(function.Context, script);
if (!p.Context.Parser.HasErrors)
{
try { p.Execute(); }
catch { return(null); }
buffer.Add(function);
return(function.Lookup());
}
}
return(null);
}