public IBELObject ValueOf(string name, ArrayList arguments, ExecutionContext ctx)
{
BELMember mi = Type.BELMembers[name] as BELMember;
if (mi== null)
return null;
ParameterInfo []parms = mi.MethodInfo.GetParameters();
int need = parms.Length;
int got = (arguments == null) ? 0 : arguments.Count;
bool needExecutionContext = mi.NeedsExecutionContext;
if (needExecutionContext && (parms.Length == 0 || parms[0].ParameterType != typeof(ExecutionContext)))
throw new ImplementationException("Incorrectly defined ExposedMethod property or function. First parameter of " + mi.MethodInfo.DeclaringType.FullName + "." + mi.MethodInfo.Name + " must be an ExecutionContext");
if (needExecutionContext)
need--;
if (got > need && !(mi.ExposedMethod.AllowsVariableArguments))
throw new MemberInvocationException(ctx.CurrentLocation, "Incorrect number of arguments (too many) for " + ExternalTypeName + "." + name + " (need " + need + ", got " + got + ")");
// Figure out what arguments we should be passing
ArrayList args = new ArrayList();
InvocationFrame invocationFrame = new InvocationFrame();
if (needExecutionContext)
args.Add(ctx);
ArrayList parameterPresentFlags = null;
if (needExecutionContext)
{
parameterPresentFlags = new ArrayList();
parameterPresentFlags.Add(true); // we know for sure the first arg is supplied; it's the execution context :-)
}
int offset = (needExecutionContext ? 1 : 0);
for (int each = offset; each < parms.Length; each++)
{
object arg = null;
if (arguments != null && (each - offset) < arguments.Count)
arg = (ParseTreeNode)(arguments[each - offset]);
if (!BELMember.IsOptionalParameter(parms[each]) && arg == null)
throw new MemberInvocationException(ctx.CurrentLocation, "Missing argument " + (each - offset) + " for " + ExternalTypeName + "." + name);
if (parameterPresentFlags != null)
parameterPresentFlags.Add(arg != null);
if (mi.ExposedMethod.IsCustomArgumentProcessor)
{
args.Add(arg);
}
else
{
if (arg == null)
args.Add(AbsentValueForParameter(parms[each]));
else
args.Add(ConvertFromBELObjectIfNeeded(((ExposableParseTreeNode)arg).Expose(ctx)));
}
}
invocationFrame.WasParameterSuppliedFlags = parameterPresentFlags;
// If we have extras (beyond those needed) and they're allowed, stash them in the MIC, too
if (mi.ExposedMethod.AllowsVariableArguments)
{
ArrayList extras = new ArrayList();
int extraCount = got - need;
if (arguments != null)
{
for (int i = need; i < got; i++)
{
object arg = arguments[i];
if (mi.ExposedMethod.IsCustomArgumentProcessor)
{
extras.Add(arg);
}
else
{
if (arg == null)
extras.Add(null);
else
extras.Add(ConvertFromBELObjectIfNeeded(((ExposableParseTreeNode)arg).Expose(ctx)));
}
}
}
invocationFrame.ExtraArguments = extras;
}
// Check types
for (int each = 0; each < parms.Length; each++)
{
bool bad = false;
if (args[each] == null)
{
if (parms[each].ParameterType.IsValueType)
bad = true;
}
else
{
if (!parms[each].ParameterType.IsAssignableFrom(args[each].GetType()))
bad = true;
}
if (bad)
throw new MemberInvocationException(ctx.CurrentLocation, "Argument " + (each + 1) + " for " + ExternalTypeName + "." + name + " is not of the correct type (was "
+ ExternalTypeNameForType(args[each].GetType()) +
", but needed " + ExternalTypeNameForType(parms[each].ParameterType) + ")");
}
// And now, invoke away!!
object result = null;
invocationFrame.PushScope(ctx.CurrentScope); // the new frame starts with the same scope as this one
ctx.PushFrame(invocationFrame);
if (Federation.GetPerformanceCounter(Federation.PerformanceCounterNames.MethodInvocation) != null)
Federation.GetPerformanceCounter(Federation.PerformanceCounterNames.MethodInvocation).Increment();
try
{
result = mi.MethodInfo.Invoke(this, args.ToArray());
}
catch (TargetInvocationException ex)
{
throw ex.InnerException;
}
ctx.PopFrame();
if (mi.ExposedMethod.CachePolicy == ExposedMethodFlags.CachePolicyNever)
ctx.AddCacheRule(new CacheRuleNever());
return Wrap(result);
}
public override IBELObject ValueOf(string name, System.Collections.ArrayList arguments, ExecutionContext ctx)
{
Hashtable members = ctx.CurrentFederation.GetTopicProperties(Name);
string val = (string)(members[name]);
if (val == null)
return null;
val = val.Trim();
bool isBlock = val.StartsWith("{");
if (!isBlock)
return new BELString(val);
// It's a block, so fire up the interpreter
if (!val.EndsWith("}"))
throw new ExecutionException("Topic member " + name + " defined in " + Name.Fullname + " is not well-formed; missing closing '}' for code block.");
ContentBase cb = CurrentFederation.ContentBaseForTopic(Name);
TopicContext newContext = new TopicContext(ctx.CurrentFederation, cb, CurrentTopicInfo);
BehaviorInterpreter interpreter = new BehaviorInterpreter(val, CurrentFederation, CurrentFederation.WikiTalkVersion, ctx.Presenter);
if (!interpreter.Parse())
throw new ExecutionException("Parsing error evaluating topic member " + name + " defined in " + Name.Fullname + ": " + interpreter.ErrorString);
IBELObject b1 = interpreter.EvaluateToObject(newContext, ctx.ExternalWikiMap);
if (b1 == null)
throw new ExecutionException("Error while evaluating topic member " + name + " defined in " + Name.Fullname + ": " + interpreter.ErrorString);
Block block = (Block)b1;
ArrayList evaluatedArgs = new ArrayList();
foreach (object each in arguments)
{
IBELObject add = null;
if (each != null && each is IBELObject)
add = each as IBELObject;
else
{
ExposableParseTreeNode ptn = each as ExposableParseTreeNode;
add = ptn.Expose(ctx);
}
evaluatedArgs.Add(add);
}
InvocationFrame invocationFrame = new InvocationFrame();
ctx.PushFrame(invocationFrame);
TopicScope topicScope = new TopicScope(null, this);
ctx.PushScope(topicScope); // make sure we can use local references
IBELObject answer = block.Value(ctx, evaluatedArgs);
ctx.PopScope();
ctx.PopFrame();
// make sure to transfer any new cache rules
// BELTODO - want a test case for this
foreach (CacheRule r in interpreter.CacheRules)
ctx.AddCacheRule(r);
return answer;
}
public override IBELObject ValueOf(string name, System.Collections.ArrayList arguments, ExecutionContext ctx)
{
TopicPropertyCollection members = ctx.CurrentFederation.GetTopicProperties(Name);
string val = members[name].LastValue;
if (val == null)
return null;
val = val.Trim();
bool isBlock = val.StartsWith("{");
if (!isBlock)
return new BELString(val);
// It's a block, so fire up the interpreter
if (!val.EndsWith("}"))
throw new ExecutionException(ctx.CurrentLocation, "Topic member " + name + " defined in " + Name.DottedName + " is not well-formed; missing closing '}' for code block.");
NamespaceManager cb = CurrentFederation.NamespaceManagerForTopic(Name);
TopicContext newContext = new TopicContext(ctx.CurrentFederation, cb, CurrentTopicInfo);
BehaviorInterpreter interpreter = new BehaviorInterpreter(Name.DottedName + "#" + name, val, CurrentFederation, CurrentFederation.WikiTalkVersion, ctx.Presenter);
if (!interpreter.Parse())
throw new ExecutionException(ctx.CurrentLocation, "Syntax error in " + interpreter.ErrorString);
IBELObject b1 = interpreter.EvaluateToObject(newContext, ctx.ExternalWikiMap);
if (b1 == null)
throw new ExecutionException(ctx.CurrentLocation, "Execution error in " + interpreter.ErrorString);
Block block = (Block) b1;
ArrayList evaluatedArgs = new ArrayList();
foreach (object each in arguments)
{
IBELObject add = null;
if (each != null && each is IBELObject)
add = each as IBELObject;
else
{
ExposableParseTreeNode ptn = each as ExposableParseTreeNode;
add = ptn.Expose(ctx);
}
evaluatedArgs.Add(add);
}
InvocationFrame invocationFrame = new InvocationFrame();
ctx.PushFrame(invocationFrame);
TopicScope topicScope = new TopicScope(null, this);
ctx.PushScope(topicScope); // make sure we can use local references
IBELObject answer = block.Value(ctx, evaluatedArgs);
ctx.PopScope();
ctx.PopFrame();
return answer;
}