private static void ResolveGhostedCatchParameter(JsActivationObject scope, JsParameterDeclaration catchParameter)
{
// check to see if the name exists in the outer variable scope.
var ghostField = scope[catchParameter.Name];
if (ghostField == null)
{
// set up a ghost field to keep track of the relationship
ghostField = new JsVariableField(JsFieldType.GhostCatch, catchParameter.Name, 0, null)
{
OriginalContext = catchParameter.Context
};
scope.AddField(ghostField);
}
else if (ghostField.FieldType == JsFieldType.GhostCatch)
{
// there is, but it's another ghost catch variable. That's fine; just use it.
// don't even flag it as ambiguous because if someone is later referencing the error variable
// used in a couple catch variables, we'll say something then because other browsers will have that
// variable undefined or from an outer scope.
}
else
{
// there is, and it's NOT another ghosted catch variable. Possible naming
// collision in IE -- if an error happens, it will clobber the existing field's value,
// although that MAY be the intention; we don't know for sure. But it IS a cross-
// browser behavior difference.
ghostField.IsAmbiguous = true;
if (ghostField.OuterField != null)
{
// and to make matters worse, it's actually bound to an OUTER field
// in modern browsers, but will bind to this catch variable in older
// versions of IE! Definitely a cross-browser difference!
// throw a cross-browser issue error.
catchParameter.Context.HandleError(JsError.AmbiguousCatchVar);
}
}
// link them so they all keep the same name going forward
// (since they are named the same in the sources)
catchParameter.VariableField.OuterField = ghostField;
// TODO: this really should be a LIST of ghosted fields, since multiple
// elements can ghost to the same field.
ghostField.GhostedField = catchParameter.VariableField;
// if the actual field has references, we want to bubble those up
// since we're now linking those fields
if (catchParameter.VariableField.RefCount > 0)
{
// add the catch parameter's references to the ghost field
ghostField.AddReferences(catchParameter.VariableField.References);
}
}
private static void ResolveGhostedFunctions(JsActivationObject scope, JsFunctionObject funcObject)
{
var functionField = funcObject.VariableField;
// let's check on ghosted names in the outer variable scope
var ghostField = scope[funcObject.Name];
if (ghostField == null)
{
// nothing; good to go. Add a ghosted field to keep track of it.
ghostField = new JsVariableField(JsFieldType.GhostFunction, funcObject.Name, 0, funcObject)
{
OriginalContext = functionField.OriginalContext,
CanCrunch = funcObject.VariableField.IfNotNull(v => v.CanCrunch)
};
scope.AddField(ghostField);
}
else if (ghostField.FieldType == JsFieldType.GhostFunction)
{
// there is, but it's another ghosted function expression.
// what if a lookup is resolved to this field later? We probably still need to
// at least flag it as ambiguous. We will only need to throw an error, though,
// if someone actually references the outer ghost variable.
ghostField.IsAmbiguous = true;
}
else
{
// something already exists. Could be a naming collision for IE or at least a
// a cross-browser behavior difference if it's not coded properly.
// mark this field as a function, even if it wasn't before
ghostField.IsFunction = true;
if (ghostField.OuterField != null)
{
// if the pre-existing field we are ghosting is a reference to
// an OUTER field, then we actually have a problem that creates a BIG
// difference between older IE browsers and everything else.
// modern browsers will have the link to the outer field, but older
// IE browsers will link to this function expression!
// fire a cross-browser error warning
ghostField.IsAmbiguous = true;
funcObject.IdContext.HandleError(JsError.AmbiguousNamedFunctionExpression);
}
else if (ghostField.IsReferenced)
{
// if the ghosted field isn't even referenced, then who cares?
// but it is referenced. Let's see if it matters.
// something like: var nm = function nm() {}
// is TOTALLY cool common cross-browser syntax.
var parentVarDecl = funcObject.Parent as JsVariableDeclaration;
if (parentVarDecl == null
|| parentVarDecl.Name != funcObject.Name)
{
// see if it's a simple assignment.
// something like: var nm; nm = function nm(){},
// would also be cool, although less-common than the vardecl version.
JsLookup lookup;
var parentAssignment = funcObject.Parent as JsBinaryOperator;
if (parentAssignment == null || parentAssignment.OperatorToken != JsToken.Assign
|| parentAssignment.Operand2 != funcObject
|| (lookup = parentAssignment.Operand1 as JsLookup) == null
|| lookup.Name != funcObject.Name)
{
// something else. Flag it as ambiguous.
ghostField.IsAmbiguous = true;
}
}
}
}
// link them so they all keep the same name going forward
// (since they are named the same in the sources)
functionField.OuterField = ghostField;
// TODO: this really should be a LIST of ghosted fields, since multiple
// elements can ghost to the same field.
ghostField.GhostedField = functionField;
// if the actual field has references, we want to bubble those up
// since we're now linking those fields
if (functionField.RefCount > 0)
{
// add the function's references to the ghost field
ghostField.AddReferences(functionField.References);
}
}
private static void ResolveGhostedCatchParameter(JsActivationObject scope, JsParameterDeclaration catchParameter)
{
// check to see if the name exists in the outer variable scope.
var ghostField = scope[catchParameter.Name];
if (ghostField == null)
{
// set up a ghost field to keep track of the relationship
ghostField = new JsVariableField(JsFieldType.GhostCatch, catchParameter.Name, 0, null)
{
OriginalContext = catchParameter.Context
};
scope.AddField(ghostField);
}
else if (ghostField.FieldType == JsFieldType.GhostCatch)
{
// there is, but it's another ghost catch variable. That's fine; just use it.
// don't even flag it as ambiguous because if someone is later referencing the error variable
// used in a couple catch variables, we'll say something then because other browsers will have that
// variable undefined or from an outer scope.
}
else
{
// there is, and it's NOT another ghosted catch variable. Possible naming
// collision in IE -- if an error happens, it will clobber the existing field's value,
// although that MAY be the intention; we don't know for sure. But it IS a cross-
// browser behavior difference.
ghostField.IsAmbiguous = true;
if (ghostField.OuterField != null)
{
// and to make matters worse, it's actually bound to an OUTER field
// in modern browsers, but will bind to this catch variable in older
// versions of IE! Definitely a cross-browser difference!
// throw a cross-browser issue error.
catchParameter.Context.HandleError(JsError.AmbiguousCatchVar);
}
}
// link them so they all keep the same name going forward
// (since they are named the same in the sources)
catchParameter.VariableField.OuterField = ghostField;
// TODO: this really should be a LIST of ghosted fields, since multiple
// elements can ghost to the same field.
ghostField.GhostedField = catchParameter.VariableField;
// if the actual field has references, we want to bubble those up
// since we're now linking those fields
if (catchParameter.VariableField.RefCount > 0)
{
// add the catch parameter's references to the ghost field
ghostField.AddReferences(catchParameter.VariableField.References);
}
}
private static void ResolveGhostedFunctions(JsActivationObject scope, JsFunctionObject funcObject)
{
var functionField = funcObject.VariableField;
// let's check on ghosted names in the outer variable scope
var ghostField = scope[funcObject.Name];
if (ghostField == null)
{
// nothing; good to go. Add a ghosted field to keep track of it.
ghostField = new JsVariableField(JsFieldType.GhostFunction, funcObject.Name, 0, funcObject)
{
OriginalContext = functionField.OriginalContext,
CanCrunch = funcObject.VariableField.IfNotNull(v => v.CanCrunch)
};
scope.AddField(ghostField);
}
else if (ghostField.FieldType == JsFieldType.GhostFunction)
{
// there is, but it's another ghosted function expression.
// what if a lookup is resolved to this field later? We probably still need to
// at least flag it as ambiguous. We will only need to throw an error, though,
// if someone actually references the outer ghost variable.
ghostField.IsAmbiguous = true;
}
else
{
// something already exists. Could be a naming collision for IE or at least a
// a cross-browser behavior difference if it's not coded properly.
// mark this field as a function, even if it wasn't before
ghostField.IsFunction = true;
if (ghostField.OuterField != null)
{
// if the pre-existing field we are ghosting is a reference to
// an OUTER field, then we actually have a problem that creates a BIG
// difference between older IE browsers and everything else.
// modern browsers will have the link to the outer field, but older
// IE browsers will link to this function expression!
// fire a cross-browser error warning
ghostField.IsAmbiguous = true;
funcObject.IdContext.HandleError(JsError.AmbiguousNamedFunctionExpression);
}
else if (ghostField.IsReferenced)
{
// if the ghosted field isn't even referenced, then who cares?
// but it is referenced. Let's see if it matters.
// something like: var nm = function nm() {}
// is TOTALLY cool common cross-browser syntax.
var parentVarDecl = funcObject.Parent as JsVariableDeclaration;
if (parentVarDecl == null ||
parentVarDecl.Name != funcObject.Name)
{
// see if it's a simple assignment.
// something like: var nm; nm = function nm(){},
// would also be cool, although less-common than the vardecl version.
JsLookup lookup;
var parentAssignment = funcObject.Parent as JsBinaryOperator;
if (parentAssignment == null || parentAssignment.OperatorToken != JsToken.Assign ||
parentAssignment.Operand2 != funcObject ||
(lookup = parentAssignment.Operand1 as JsLookup) == null ||
lookup.Name != funcObject.Name)
{
// something else. Flag it as ambiguous.
ghostField.IsAmbiguous = true;
}
}
}
}
// link them so they all keep the same name going forward
// (since they are named the same in the sources)
functionField.OuterField = ghostField;
// TODO: this really should be a LIST of ghosted fields, since multiple
// elements can ghost to the same field.
ghostField.GhostedField = functionField;
// if the actual field has references, we want to bubble those up
// since we're now linking those fields
if (functionField.RefCount > 0)
{
// add the function's references to the ghost field
ghostField.AddReferences(functionField.References);
}
}