internal static dynamic Resolve(object rawName, object rawScope)
{
if (rawName.GetType() == typeof(InstanceReference))
{
var iref = (InstanceReference)rawName;
var lval = CompilerServices.CompileExpression(iref.LValue, (NovaScope)rawScope);
var gmArgs = new List <Expression>();
gmArgs.Add(Expression.Constant(lval, typeof(object)));
return(Dynamic(typeof(object), new InteropBinder.GetMember(iref.Key, (NovaScope)rawScope), gmArgs));
}
var name = (string)rawName;
var scope = (NovaScope)rawScope;
if (name.StartsWith("$") && name != "$:")
{
scope = scope.GlobalScope;
name = name.Substring(1);
}
if (name.StartsWith("@") && scope["<nova_context_invokemember>"] != null)
{
if (name.StartsWith("@@"))
{
var _val = Resolve("self", scope);
if (!(_val is NovaInstance))
{
// native object?
_val = Nova.Box((object)_val, scope);
}
var @class = ((NovaInstance)_val).Class;
return
(CompilerServices.CompileExpression(
NovaExpression.Variable(NovaExpression.InstanceRef(Expression.Constant(@class),
Expression.Constant(name.Substring(2)))), scope));
}
return
(CompilerServices.CompileExpression(
NovaExpression.Variable(
NovaExpression.InstanceRef(NovaExpression.Variable(Expression.Constant("self")),
Expression.Constant(name.Substring(1)))), scope));
}
var val = scope[name];
// The cast is needed here because if we get a non-nullable type (such as System.Int32) the check here will throw an exception.
// By casting to System.Object we can avoid the exception since it is a boxed value that can be null.
if ((object)val == null)
{
Type type;
if ((type = NovaTypeResolver.Resolve(name)) != null)
{
var @class = NovaClass.BoxClass(type);
scope.GlobalScope[@class.Name] = @class;
val = @class;
}
}
return(val);
}
internal static dynamic Begin(object rawTryExpression, List <Expression> rescueBlocksRaw,
object rawEnsureBlock, object rawElseBlock, object rawScope)
{
var tryExpression = (Expression)rawTryExpression;
var ensureBlock = (Expression)rawEnsureBlock;
var elseBlock = (Expression)rawElseBlock;
var scope = (NovaScope)rawScope;
dynamic retVal = null;
var exceptionRaised = false;
var ensureRun = false;
var rescueBlocks = new List <RescueExpression>();
rescueBlocksRaw.ForEach(
rawBlock =>
{
var block = rawBlock as RescueExpression;
if (block != null)
{
rescueBlocks.Add(block);
}
});
try
{
retVal = CompilerServices.CompileExpression(tryExpression, scope);
}
catch (Exception e)
{
var NovaException = e as NovaException;
var exType = NovaException != null ? NovaException.ExceptionClass.Name : e.GetType().Name;
var found = false;
exceptionRaised = true;
foreach (var rescueBlock in rescueBlocks)
{
var exceptionTypes = new List <string>();
if (!rescueBlock.IsWildcard)
{
foreach (var type in rescueBlock.ExceptionTypes)
{
var obj = Resolve(type, scope);
var instance = obj as NovaInstance;
if (instance != null)
{
exceptionTypes.Add(instance.Class.Name);
}
else
{
var @class = obj as NovaClass;
if (@class != null)
{
exceptionTypes.Add(@class.Name);
}
var s = obj as string;
if (s != null)
{
exceptionTypes.Add(s);
}
var ss = obj as NovaString;
if (ss != null)
{
exceptionTypes.Add(ss);
}
}
}
}
var exMatches = rescueBlock.IsWildcard;
if (!exMatches)
{
if ((from type in exceptionTypes select NovaTypeResolver.Resolve(type) into _exType where _exType != null let __exType = NovaTypeResolver.Resolve(exType) where __exType != null && __exType.IsSubclassOf(_exType) || __exType == _exType select _exType).Any())
{
exMatches = true;
}
}
found = exMatches;
if (!found)
{
if (exceptionTypes.Contains(exType))
{
found = true;
}
else
{
continue;
}
}
var exception = e as NovaException;
if (exception != null)
{
scope[rescueBlock.VarName] = exception.InnerObject;
}
else
{
scope[rescueBlock.VarName] = e;
}
try
{
retVal = CompilerServices.CompileExpression(rescueBlock.Body, scope);
}
catch (Exception)
{
if (ensureBlock == null)
{
throw;
}
ensureRun = true;
CompilerServices.CompileExpression(ensureBlock, scope);
throw;
}
break;
}
if (!found)
{
throw;
}
}
finally
{
if (!exceptionRaised && elseBlock != null)
{
CompilerServices.CompileExpression(elseBlock, scope);
}
if (!ensureRun && ensureBlock != null)
{
CompilerServices.CompileExpression(ensureBlock, scope);
}
}
return(retVal);
}