protected EObject findCorrectContainer(
org.emftext.language.xpath3.resource.xpath3.mopp.Xpath3ExpectedTerminal expectedTerminal) {
EObject container = expectedTerminal.getContainer();
EClass ruleMetaclass = expectedTerminal.getTerminal().getRuleMetaclass();
if (ruleMetaclass.isInstance(container)) {
// container is correct for expected terminal
return container;
}
// the container is wrong
EObject parent = null;
EObject previousParent = null;
EObject correctContainer = null;
EObject hookableParent = null;
org.emftext.language.xpath3.resource.xpath3.grammar.Xpath3ContainmentTrace containmentTrace =
expectedTerminal.getContainmentTrace();
EClass startClass = containmentTrace.getStartClass();
org.emftext.language.xpath3.resource.xpath3.mopp.Xpath3ContainedFeature currentLink = null;
org.emftext.language.xpath3.resource.xpath3.mopp.Xpath3ContainedFeature previousLink = null;
org.emftext.language.xpath3.resource.xpath3.mopp.Xpath3ContainedFeature[] containedFeatures =
containmentTrace.getPath();
for (int i = 0; i < containedFeatures.length; i++) {
currentLink = containedFeatures[i];
if (i > 0) {
previousLink = containedFeatures[i - 1];
}
EClass containerClass = currentLink.getContainerClass();
hookableParent = findHookParent(container, startClass, currentLink, parent);
if (hookableParent != null) {
// we found the correct parent
break;
} else {
previousParent = parent;
parent = containerClass.getEPackage().getEFactoryInstance().create(containerClass);
if (parent != null) {
if (previousParent == null) {
// replace container for expectedTerminal with correctContainer
correctContainer = parent;
} else {
// This assignment is only performed to get rid of a warning about a potential
// null pointer access. Variable 'previousLink' cannot be null here, because it is
// initialized for all loop iterations where 'i' is greather than 0 and for the
// case where 'i' equals zero, this path is never executed, because
// 'previousParent' is null in this case.
org.emftext.language.xpath3.resource.xpath3.mopp.Xpath3ContainedFeature link =
previousLink;
org.emftext.language.xpath3.resource.xpath3.util.Xpath3EObjectUtil.setFeature(
parent, link.getFeature(), previousParent, false);
}
}
}
}
if (correctContainer == null) {
correctContainer = container;
}
if (currentLink == null) {
return correctContainer;
}
hookableParent = findHookParent(container, startClass, currentLink, parent);
final EObject finalHookableParent = hookableParent;
final EStructuralFeature finalFeature = currentLink.getFeature();
final EObject finalParent = parent;
if (parent != null && hookableParent != null) {
expectedTerminal.setAttachmentCode(
new Runnable() {
public void run() {
org.emftext.language.xpath3.resource.xpath3.util.Xpath3EObjectUtil.setFeature(
finalHookableParent, finalFeature, finalParent, false);
}
});
}
return correctContainer;
}
protected Collection<org.emftext.language.xpath3.resource.xpath3.ui.Xpath3CompletionProposal>
deriveProposals(
final org.emftext.language.xpath3.resource.xpath3.mopp.Xpath3ExpectedTerminal
expectedTerminal,
String content,
org.emftext.language.xpath3.resource.xpath3.IXpath3TextResource resource,
int cursorOffset) {
org.emftext.language.xpath3.resource.xpath3.IXpath3ExpectedElement expectedElement =
(org.emftext.language.xpath3.resource.xpath3.IXpath3ExpectedElement)
expectedTerminal.getTerminal();
if (expectedElement
instanceof org.emftext.language.xpath3.resource.xpath3.mopp.Xpath3ExpectedCsString) {
org.emftext.language.xpath3.resource.xpath3.mopp.Xpath3ExpectedCsString csString =
(org.emftext.language.xpath3.resource.xpath3.mopp.Xpath3ExpectedCsString) expectedElement;
return handleKeyword(
expectedTerminal,
csString,
expectedTerminal.getPrefix(),
expectedTerminal.getContainer());
} else if (expectedElement
instanceof org.emftext.language.xpath3.resource.xpath3.mopp.Xpath3ExpectedBooleanTerminal) {
org.emftext.language.xpath3.resource.xpath3.mopp.Xpath3ExpectedBooleanTerminal
expectedBooleanTerminal =
(org.emftext.language.xpath3.resource.xpath3.mopp.Xpath3ExpectedBooleanTerminal)
expectedElement;
return handleBooleanTerminal(
expectedTerminal, expectedBooleanTerminal, expectedTerminal.getPrefix());
} else if (expectedElement
instanceof
org.emftext.language.xpath3.resource.xpath3.mopp.Xpath3ExpectedEnumerationTerminal) {
org.emftext.language.xpath3.resource.xpath3.mopp.Xpath3ExpectedEnumerationTerminal
expectedEnumerationTerminal =
(org.emftext.language.xpath3.resource.xpath3.mopp.Xpath3ExpectedEnumerationTerminal)
expectedElement;
return handleEnumerationTerminal(
expectedTerminal, expectedEnumerationTerminal, expectedTerminal.getPrefix());
} else if (expectedElement
instanceof
org.emftext.language.xpath3.resource.xpath3.mopp.Xpath3ExpectedStructuralFeature) {
final org.emftext.language.xpath3.resource.xpath3.mopp.Xpath3ExpectedStructuralFeature
expectedFeature =
(org.emftext.language.xpath3.resource.xpath3.mopp.Xpath3ExpectedStructuralFeature)
expectedElement;
final EStructuralFeature feature = expectedFeature.getFeature();
final EClassifier featureType = feature.getEType();
final EObject container = findCorrectContainer(expectedTerminal);
// Here it gets really crazy. We need to modify the model in a way that reflects
// the state the model would be in, if the expected terminal were present. After
// computing the corresponding completion proposals, the original state of the
// model is restored. This procedure is required, because different models can be
// required for different completion situations. This can be particularly observed
// when the user has not yet typed a character that starts an element to be
// completed.
final Collection<org.emftext.language.xpath3.resource.xpath3.ui.Xpath3CompletionProposal>
proposals =
new ArrayList<
org.emftext.language.xpath3.resource.xpath3.ui.Xpath3CompletionProposal>();
expectedTerminal.materialize(
new Runnable() {
public void run() {
if (feature instanceof EReference) {
EReference reference = (EReference) feature;
if (featureType instanceof EClass) {
if (reference.isContainment()) {
// the FOLLOW set should contain only non-containment references
assert false;
} else {
proposals.addAll(
handleNCReference(
expectedTerminal,
container,
reference,
expectedTerminal.getPrefix(),
expectedFeature.getTokenName()));
}
}
} else if (feature instanceof EAttribute) {
EAttribute attribute = (EAttribute) feature;
if (featureType instanceof EEnum) {
EEnum enumType = (EEnum) featureType;
proposals.addAll(
handleEnumAttribute(
expectedTerminal,
expectedFeature,
enumType,
expectedTerminal.getPrefix(),
container));
} else {
// handle EAttributes (derive default value depending on the type of the
// attribute, figure out token resolver, and call deResolve())
proposals.addAll(
handleAttribute(
expectedTerminal,
expectedFeature,
container,
attribute,
expectedTerminal.getPrefix()));
}
} else {
// there should be no other subclass of EStructuralFeature
assert false;
}
}
});
// Return the proposals that were computed in the closure call.
return proposals;
} else {
// there should be no other class implementing IExpectedElement
assert false;
}
return Collections.emptyList();
}