object ExecuteFunction(Command cmd, object instance, bool useDefaultVar)
{
object result = null;
string origName = ((Literal)cmd.Args[0]).Value;
string assemblyName = null;
string className = null;
string methodName = null;
string[] splitName = origName.ToLowerInvariant().Split(new char[] { '_' }, StringSplitOptions.RemoveEmptyEntries);
if (splitName.Length == 1)
{
methodName = splitName[0];
}
else if (splitName.Length == 2)
{
className = splitName[0];
methodName = splitName[1];
}
else if (splitName.Length == 3)
{
assemblyName = splitName[0];
className = splitName[1];
methodName = splitName[2];
}
else
{
throw new Exception("Invalid function name: " + origName + "()");
}
if (methodName == LoadPluginName)
{
string path;
if (useDefaultVar)
{
path = (string)defaultVar;
}
else
{
path = (string)ExecuteExpr(cmd.Args[1]);
}
PluginManager.LoadPlugin(path);
}
else if (methodName == ImportName)
{
string path;
if (useDefaultVar)
{
path = (string)defaultVar;
}
else
{
path = (string)ExecuteExpr(cmd.Args[1]);
}
ScriptParser parser = new ScriptParser(path);
string prevCWD = Environment.CurrentDirectory;
Environment.CurrentDirectory = parser.CWD;
ExecuteExpr(parser.CommandRoot);
Environment.CurrentDirectory = prevCWD;
}
else
{
List <FunctionBase> plugins;
if (!PluginManager.Functions.TryGetValue(methodName, out plugins) || (plugins.Count <= 0))
{
throw new Exception("Couldn't find plugin for " + origName + "()");
}
if (assemblyName != null)
{
for (int i = 0; i < plugins.Count;)
{
string pluginAssemblyName = Path.GetFileNameWithoutExtension(plugins[i].Type.Assembly.CodeBase).ToLowerInvariant();
if (assemblyName == pluginAssemblyName)
{
i++;
}
else
{
plugins.RemoveAt(i);
}
}
}
if (className != null)
{
for (int i = 0; i < plugins.Count;)
{
string pluginClassName = plugins[i].Type.Name.ToLowerInvariant();
if (className == pluginClassName)
{
i++;
}
else
{
plugins.RemoveAt(i);
}
}
}
if (plugins.Count <= 0)
{
throw new Exception("Couldn't find plugin for " + origName + "()");
}
ScriptArg[] scriptArgs;
int argIdx = 0;
if (useDefaultVar)
{
scriptArgs = new ScriptArg[cmd.Args.Count];
ScriptArg scriptArg = new ScriptArg();
scriptArg.Value = defaultVar;
scriptArgs[argIdx] = scriptArg;
argIdx++;
}
else
{
scriptArgs = new ScriptArg[cmd.Args.Count - 1];
}
for (int cmdIdx = 1; cmdIdx < cmd.Args.Count; cmdIdx++)
{
ScriptArg scriptArg = new ScriptArg();
Expr cmdArg = cmd.Args[cmdIdx];
if (cmdArg.Type == ExprType.Assign)
{
Command assign = (Command)cmdArg;
scriptArg.Name = ((Literal)assign.Args[0]).Value;
cmdArg = assign.Args[1];
}
if (cmdArg.Type == ExprType.Name)
{
scriptArg.Variable = ((Literal)cmdArg).Value;
}
scriptArg.Value = ExecuteExpr(cmdArg);
scriptArgs[argIdx] = scriptArg;
argIdx++;
}
bool instanceExactMatch = false;
int minConversions = Int32.MaxValue;
FunctionArg[] pluginArgs = null;
FunctionBase plugin = null;
for (int i = 0; i < plugins.Count; i++)
{
int numConversions;
FunctionArg[] matchArgs = plugins[i].Match(scriptArgs, useDefaultVar, out numConversions);
if ((matchArgs != null) && (numConversions < minConversions))
{
if (instance == null)
{
pluginArgs = matchArgs;
plugin = plugins[i];
minConversions = numConversions;
}
else
{
Type instanceType = instance.GetType();
if (plugins[i].Type.Equals(instanceType))
{
pluginArgs = matchArgs;
plugin = plugins[i];
minConversions = numConversions;
instanceExactMatch = true;
}
else if (!instanceExactMatch && plugins[i].Type.IsAssignableFrom(instanceType))
{
pluginArgs = matchArgs;
plugin = plugins[i];
minConversions = numConversions;
}
}
}
}
if (pluginArgs == null)
{
throw new Exception("Couldn't match args for " + origName + "()");
}
List <FunctionArg> changedVars;
result = plugin.RunPlugin(instance, pluginArgs, out changedVars);
for (int i = 0; i < changedVars.Count; i++)
{
FunctionArg pluginArg = changedVars[i];
if (pluginArg.DefaultVar)
{
defaultVar = pluginArg.Value;
}
else
{
Variables[pluginArg.Variable] = pluginArg.Value;
}
}
}
return(result);
}
