/**
* <copyright>
* </copyright>
*
*
*/
package org.dresdenocl.language.ocl.resource.ocl.ui;
import java.io.ByteArrayInputStream;
import java.util.ArrayList;
import java.util.Arrays;
import java.util.Collection;
import java.util.Collections;
import java.util.LinkedHashMap;
import java.util.LinkedHashSet;
import java.util.List;
import java.util.Map;
import org.eclipse.core.runtime.Platform;
import org.eclipse.emf.ecore.EAttribute;
import org.eclipse.emf.ecore.EClass;
import org.eclipse.emf.ecore.EClassifier;
import org.eclipse.emf.ecore.EEnum;
import org.eclipse.emf.ecore.EEnumLiteral;
import org.eclipse.emf.ecore.EObject;
import org.eclipse.emf.ecore.EReference;
import org.eclipse.emf.ecore.EStructuralFeature;
import org.eclipse.emf.ecore.provider.EcoreItemProviderAdapterFactory;
import org.eclipse.emf.ecore.resource.ResourceSet;
import org.eclipse.emf.ecore.resource.impl.ResourceSetImpl;
import org.eclipse.emf.edit.provider.ComposedAdapterFactory;
import org.eclipse.emf.edit.provider.ReflectiveItemProviderAdapterFactory;
import org.eclipse.emf.edit.provider.resource.ResourceItemProviderAdapterFactory;
import org.eclipse.emf.edit.ui.provider.AdapterFactoryLabelProvider;
import org.eclipse.swt.graphics.Image;
/**
* A CodeCompletionHelper can be used to derive completion proposals for partial
* documents. It runs the parser generated by EMFText in a special mode (i.e., the
* rememberExpectedElements mode). Based on the elements that are expected by the
* parser for different regions in the document, valid proposals are computed.
*/
public class OclCodeCompletionHelper {
private org.dresdenocl.language.ocl.resource.ocl.mopp.OclAttributeValueProvider attributeValueProvider = new org.dresdenocl.language.ocl.resource.ocl.mopp.OclAttributeValueProvider();
private org.dresdenocl.language.ocl.resource.ocl.IOclMetaInformation metaInformation = new org.dresdenocl.language.ocl.resource.ocl.mopp.OclMetaInformation();
/**
* <p>
* Computes a set of proposals for the given document assuming the cursor is at
* 'cursorOffset'. The proposals are derived using the meta information, i.e., the
* generated language plug-in.
* </p>
*
* @param originalResource the resource to compute completions for
* @param content the documents content
* @param cursorOffset the current offset of the cursor
*
* @return an array of completion proposals
*/
public org.dresdenocl.language.ocl.resource.ocl.ui.OclCompletionProposal[] computeCompletionProposals(org.dresdenocl.language.ocl.resource.ocl.IOclTextResource originalResource, String content, int cursorOffset) {
ResourceSet resourceSet = new ResourceSetImpl();
// the shadow resource needs the same URI because reference resolvers may use the
// URI to resolve external references
org.dresdenocl.language.ocl.resource.ocl.IOclTextResource resource = (org.dresdenocl.language.ocl.resource.ocl.IOclTextResource) resourceSet.createResource(originalResource.getURI());
ByteArrayInputStream inputStream = new ByteArrayInputStream(content.getBytes());
org.dresdenocl.language.ocl.resource.ocl.IOclMetaInformation metaInformation = resource.getMetaInformation();
org.dresdenocl.language.ocl.resource.ocl.IOclTextParser parser = metaInformation.createParser(inputStream, null);
org.dresdenocl.language.ocl.resource.ocl.mopp.OclExpectedTerminal[] expectedElements = parseToExpectedElements(parser, resource, cursorOffset);
if (expectedElements == null) {
return new org.dresdenocl.language.ocl.resource.ocl.ui.OclCompletionProposal[0];
}
if (expectedElements.length == 0) {
return new org.dresdenocl.language.ocl.resource.ocl.ui.OclCompletionProposal[0];
}
List<org.dresdenocl.language.ocl.resource.ocl.mopp.OclExpectedTerminal> expectedAfterCursor = Arrays.asList(getElementsExpectedAt(expectedElements, cursorOffset));
List<org.dresdenocl.language.ocl.resource.ocl.mopp.OclExpectedTerminal> expectedBeforeCursor = Arrays.asList(getElementsExpectedAt(expectedElements, cursorOffset - 1));
setPrefixes(expectedAfterCursor, content, cursorOffset);
setPrefixes(expectedBeforeCursor, content, cursorOffset);
// First, we derive all possible proposals from the set of elements that are
// expected at the cursor position.
Collection<org.dresdenocl.language.ocl.resource.ocl.ui.OclCompletionProposal> allProposals = new LinkedHashSet<org.dresdenocl.language.ocl.resource.ocl.ui.OclCompletionProposal>();
Collection<org.dresdenocl.language.ocl.resource.ocl.ui.OclCompletionProposal> rightProposals = deriveProposals(expectedAfterCursor, content, resource, cursorOffset);
Collection<org.dresdenocl.language.ocl.resource.ocl.ui.OclCompletionProposal> leftProposals = deriveProposals(expectedBeforeCursor, content, resource, cursorOffset - 1);
removeKeywordsEndingBeforeIndex(leftProposals, cursorOffset);
// Second, the set of left proposals (i.e., the ones before the cursor) is checked
// for emptiness. If the set is empty, the right proposals (i.e., the ones after
// the cursor) are also considered. If the set is not empty, the right proposal
// are discarded, because it does not make sense to propose them until the element
// before the cursor was completed.
allProposals.addAll(leftProposals);
// Count the proposals before the cursor that match the prefix
int leftMatchingProposals = 0;
for (org.dresdenocl.language.ocl.resource.ocl.ui.OclCompletionProposal leftProposal : leftProposals) {
if (leftProposal.isMatchesPrefix()) {
leftMatchingProposals++;
}
}
if (leftMatchingProposals == 0) {
allProposals.addAll(rightProposals);
}
// Third, the proposals are sorted according to their relevance. Proposals that
// matched the prefix are preferred over ones that did not. Finally, proposals are
// sorted alphabetically.
final List<org.dresdenocl.language.ocl.resource.ocl.ui.OclCompletionProposal> sortedProposals = new ArrayList<org.dresdenocl.language.ocl.resource.ocl.ui.OclCompletionProposal>(allProposals);
Collections.sort(sortedProposals);
EObject root = null;
if (!resource.getContents().isEmpty()) {
root = resource.getContents().get(0);
}
for (org.dresdenocl.language.ocl.resource.ocl.ui.OclCompletionProposal proposal : sortedProposals) {
proposal.setRoot(root);
}
return sortedProposals.toArray(new org.dresdenocl.language.ocl.resource.ocl.ui.OclCompletionProposal[sortedProposals.size()]);
}
public org.dresdenocl.language.ocl.resource.ocl.mopp.OclExpectedTerminal[] parseToExpectedElements(org.dresdenocl.language.ocl.resource.ocl.IOclTextParser parser, org.dresdenocl.language.ocl.resource.ocl.IOclTextResource resource, int cursorOffset) {
final List<org.dresdenocl.language.ocl.resource.ocl.mopp.OclExpectedTerminal> expectedElements = parser.parseToExpectedElements(null, resource, cursorOffset);
if (expectedElements == null) {
return new org.dresdenocl.language.ocl.resource.ocl.mopp.OclExpectedTerminal[0];
}
removeDuplicateEntries(expectedElements);
removeInvalidEntriesAtEnd(expectedElements);
return expectedElements.toArray(new org.dresdenocl.language.ocl.resource.ocl.mopp.OclExpectedTerminal[expectedElements.size()]);
}
/**
* Removes all expected elements that refer to the same terminal and that start at
* the same position.
*/
protected void removeDuplicateEntries(List<org.dresdenocl.language.ocl.resource.ocl.mopp.OclExpectedTerminal> expectedElements) {
int size = expectedElements.size();
// We split the list of expected elements into buckets where each bucket contains
// the elements that start at the same position.
Map<Integer, List<org.dresdenocl.language.ocl.resource.ocl.mopp.OclExpectedTerminal>> map = new LinkedHashMap<Integer, List<org.dresdenocl.language.ocl.resource.ocl.mopp.OclExpectedTerminal>>();
for (int i = 0; i < size; i++) {
org.dresdenocl.language.ocl.resource.ocl.mopp.OclExpectedTerminal elementAtIndex = expectedElements.get(i);
int start1 = elementAtIndex.getStartExcludingHiddenTokens();
List<org.dresdenocl.language.ocl.resource.ocl.mopp.OclExpectedTerminal> list = map.get(start1);
if (list == null) {
list = new ArrayList<org.dresdenocl.language.ocl.resource.ocl.mopp.OclExpectedTerminal>();
map.put(start1, list);
}
list.add(elementAtIndex);
}
// Then, we remove all duplicate elements from each bucket individually.
for (int position : map.keySet()) {
List<org.dresdenocl.language.ocl.resource.ocl.mopp.OclExpectedTerminal> list = map.get(position);
removeDuplicateEntriesFromBucket(list);
}
// After removing all duplicates, we merge the buckets.
expectedElements.clear();
for (int position : map.keySet()) {
List<org.dresdenocl.language.ocl.resource.ocl.mopp.OclExpectedTerminal> list = map.get(position);
expectedElements.addAll(list);
}
}
/**
* Removes all expected elements that refer to the same terminal. Attention: This
* method assumes that the given list of expected terminals contains only elements
* that start at the same position.
*/
protected void removeDuplicateEntriesFromBucket(List<org.dresdenocl.language.ocl.resource.ocl.mopp.OclExpectedTerminal> expectedElements) {
int size = expectedElements.size();
for (int i = 0; i < size - 1; i++) {
org.dresdenocl.language.ocl.resource.ocl.mopp.OclExpectedTerminal elementAtIndex = expectedElements.get(i);
org.dresdenocl.language.ocl.resource.ocl.IOclExpectedElement terminal = elementAtIndex.getTerminal();
for (int j = i + 1; j < size;) {
org.dresdenocl.language.ocl.resource.ocl.mopp.OclExpectedTerminal elementAtNext = expectedElements.get(j);
if (terminal.equals(elementAtNext.getTerminal())) {
expectedElements.remove(j);
size--;
} else {
j++;
}
}
}
}
protected void removeInvalidEntriesAtEnd(List<org.dresdenocl.language.ocl.resource.ocl.mopp.OclExpectedTerminal> expectedElements) {
for (int i = 0; i < expectedElements.size() - 1;) {
org.dresdenocl.language.ocl.resource.ocl.mopp.OclExpectedTerminal elementAtIndex = expectedElements.get(i);
org.dresdenocl.language.ocl.resource.ocl.mopp.OclExpectedTerminal elementAtNext = expectedElements.get(i + 1);
// If the two expected elements have a different parent in the syntax definition,
// we must not discard the second element, because it probably stems from a parent
// rule.
org.dresdenocl.language.ocl.resource.ocl.grammar.OclSyntaxElement symtaxElementOfThis = elementAtIndex.getTerminal().getSymtaxElement();
org.dresdenocl.language.ocl.resource.ocl.grammar.OclSyntaxElement symtaxElementOfNext = elementAtNext.getTerminal().getSymtaxElement();
boolean differentParent = symtaxElementOfNext.getParent() != symtaxElementOfThis.getParent();
boolean sameStartExcludingHiddenTokens = elementAtIndex.getStartExcludingHiddenTokens() == elementAtNext.getStartExcludingHiddenTokens();
boolean differentFollowSet = elementAtIndex.getFollowSetID() != elementAtNext.getFollowSetID();
if (sameStartExcludingHiddenTokens && differentFollowSet && !differentParent) {
expectedElements.remove(i + 1);
} else {
i++;
}
}
}
/**
* Removes all proposals for keywords that end before the given index.
*/
protected void removeKeywordsEndingBeforeIndex(Collection<org.dresdenocl.language.ocl.resource.ocl.ui.OclCompletionProposal> proposals, int index) {
List<org.dresdenocl.language.ocl.resource.ocl.ui.OclCompletionProposal> toRemove = new ArrayList<org.dresdenocl.language.ocl.resource.ocl.ui.OclCompletionProposal>();
for (org.dresdenocl.language.ocl.resource.ocl.ui.OclCompletionProposal proposal : proposals) {
org.dresdenocl.language.ocl.resource.ocl.mopp.OclExpectedTerminal expectedTerminal = proposal.getExpectedTerminal();
org.dresdenocl.language.ocl.resource.ocl.IOclExpectedElement terminal = expectedTerminal.getTerminal();
if (terminal instanceof org.dresdenocl.language.ocl.resource.ocl.mopp.OclExpectedCsString) {
org.dresdenocl.language.ocl.resource.ocl.mopp.OclExpectedCsString csString = (org.dresdenocl.language.ocl.resource.ocl.mopp.OclExpectedCsString) terminal;
int startExcludingHiddenTokens = expectedTerminal.getStartExcludingHiddenTokens();
if (startExcludingHiddenTokens + csString.getValue().length() - 1 < index) {
toRemove.add(proposal);
}
}
}
proposals.removeAll(toRemove);
}
protected String findPrefix(List<org.dresdenocl.language.ocl.resource.ocl.mopp.OclExpectedTerminal> expectedElements, org.dresdenocl.language.ocl.resource.ocl.mopp.OclExpectedTerminal expectedAtCursor, String content, int cursorOffset) {
if (cursorOffset < 0) {
return "";
}
int end = 0;
for (org.dresdenocl.language.ocl.resource.ocl.mopp.OclExpectedTerminal expectedElement : expectedElements) {
if (expectedElement == expectedAtCursor) {
final int start = expectedElement.getStartExcludingHiddenTokens();
if (start >= 0 && start < Integer.MAX_VALUE) {
end = start;
}
break;
}
}
end = Math.min(end, cursorOffset);
final String prefix = content.substring(end, Math.min(content.length(), cursorOffset));
return prefix;
}
protected Collection<org.dresdenocl.language.ocl.resource.ocl.ui.OclCompletionProposal> deriveProposals(List<org.dresdenocl.language.ocl.resource.ocl.mopp.OclExpectedTerminal> expectedElements, String content, org.dresdenocl.language.ocl.resource.ocl.IOclTextResource resource, int cursorOffset) {
Collection<org.dresdenocl.language.ocl.resource.ocl.ui.OclCompletionProposal> resultSet = new LinkedHashSet<org.dresdenocl.language.ocl.resource.ocl.ui.OclCompletionProposal>();
for (org.dresdenocl.language.ocl.resource.ocl.mopp.OclExpectedTerminal expectedElement : expectedElements) {
resultSet.addAll(deriveProposals(expectedElement, content, resource, cursorOffset));
}
return resultSet;
}
protected Collection<org.dresdenocl.language.ocl.resource.ocl.ui.OclCompletionProposal> deriveProposals(final org.dresdenocl.language.ocl.resource.ocl.mopp.OclExpectedTerminal expectedTerminal, String content, org.dresdenocl.language.ocl.resource.ocl.IOclTextResource resource, int cursorOffset) {
org.dresdenocl.language.ocl.resource.ocl.IOclExpectedElement expectedElement = (org.dresdenocl.language.ocl.resource.ocl.IOclExpectedElement) expectedTerminal.getTerminal();
if (expectedElement instanceof org.dresdenocl.language.ocl.resource.ocl.mopp.OclExpectedCsString) {
org.dresdenocl.language.ocl.resource.ocl.mopp.OclExpectedCsString csString = (org.dresdenocl.language.ocl.resource.ocl.mopp.OclExpectedCsString) expectedElement;
return handleKeyword(expectedTerminal, csString, expectedTerminal.getPrefix(), expectedTerminal.getContainer());
} else if (expectedElement instanceof org.dresdenocl.language.ocl.resource.ocl.mopp.OclExpectedBooleanTerminal) {
org.dresdenocl.language.ocl.resource.ocl.mopp.OclExpectedBooleanTerminal expectedBooleanTerminal = (org.dresdenocl.language.ocl.resource.ocl.mopp.OclExpectedBooleanTerminal) expectedElement;
return handleBooleanTerminal(expectedTerminal, expectedBooleanTerminal, expectedTerminal.getPrefix());
} else if (expectedElement instanceof org.dresdenocl.language.ocl.resource.ocl.mopp.OclExpectedEnumerationTerminal) {
org.dresdenocl.language.ocl.resource.ocl.mopp.OclExpectedEnumerationTerminal expectedEnumerationTerminal = (org.dresdenocl.language.ocl.resource.ocl.mopp.OclExpectedEnumerationTerminal) expectedElement;
return handleEnumerationTerminal(expectedTerminal, expectedEnumerationTerminal, expectedTerminal.getPrefix());
} else if (expectedElement instanceof org.dresdenocl.language.ocl.resource.ocl.mopp.OclExpectedStructuralFeature) {
final org.dresdenocl.language.ocl.resource.ocl.mopp.OclExpectedStructuralFeature expectedFeature = (org.dresdenocl.language.ocl.resource.ocl.mopp.OclExpectedStructuralFeature) 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.dresdenocl.language.ocl.resource.ocl.ui.OclCompletionProposal> proposals = new ArrayList<org.dresdenocl.language.ocl.resource.ocl.ui.OclCompletionProposal>();
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();
}
protected Collection<org.dresdenocl.language.ocl.resource.ocl.ui.OclCompletionProposal> handleEnumAttribute(org.dresdenocl.language.ocl.resource.ocl.mopp.OclExpectedTerminal expectedTerminal, org.dresdenocl.language.ocl.resource.ocl.mopp.OclExpectedStructuralFeature expectedFeature, EEnum enumType, String prefix, EObject container) {
Collection<EEnumLiteral> enumLiterals = enumType.getELiterals();
Collection<org.dresdenocl.language.ocl.resource.ocl.ui.OclCompletionProposal> result = new LinkedHashSet<org.dresdenocl.language.ocl.resource.ocl.ui.OclCompletionProposal>();
for (EEnumLiteral literal : enumLiterals) {
String unResolvedLiteral = literal.getLiteral();
// use token resolver to get de-resolved value of the literal
org.dresdenocl.language.ocl.resource.ocl.IOclTokenResolverFactory tokenResolverFactory = metaInformation.getTokenResolverFactory();
org.dresdenocl.language.ocl.resource.ocl.IOclTokenResolver tokenResolver = tokenResolverFactory.createTokenResolver(expectedFeature.getTokenName());
String resolvedLiteral = tokenResolver.deResolve(unResolvedLiteral, expectedFeature.getFeature(), container);
boolean matchesPrefix = matches(resolvedLiteral, prefix);
result.add(new org.dresdenocl.language.ocl.resource.ocl.ui.OclCompletionProposal(expectedTerminal, resolvedLiteral, prefix, matchesPrefix, expectedFeature.getFeature(), container));
}
return result;
}
protected Collection<org.dresdenocl.language.ocl.resource.ocl.ui.OclCompletionProposal> handleNCReference(org.dresdenocl.language.ocl.resource.ocl.mopp.OclExpectedTerminal expectedTerminal, EObject container, EReference reference, String prefix, String tokenName) {
// proposals for non-containment references are derived by calling the reference
// resolver switch in fuzzy mode.
org.dresdenocl.language.ocl.resource.ocl.IOclReferenceResolverSwitch resolverSwitch = metaInformation.getReferenceResolverSwitch();
org.dresdenocl.language.ocl.resource.ocl.IOclTokenResolverFactory tokenResolverFactory = metaInformation.getTokenResolverFactory();
org.dresdenocl.language.ocl.resource.ocl.IOclReferenceResolveResult<EObject> result = new org.dresdenocl.language.ocl.resource.ocl.mopp.OclReferenceResolveResult<EObject>(true);
resolverSwitch.resolveFuzzy(prefix, container, reference, 0, result);
Collection<org.dresdenocl.language.ocl.resource.ocl.IOclReferenceMapping<EObject>> mappings = result.getMappings();
if (mappings != null) {
Collection<org.dresdenocl.language.ocl.resource.ocl.ui.OclCompletionProposal> resultSet = new LinkedHashSet<org.dresdenocl.language.ocl.resource.ocl.ui.OclCompletionProposal>();
for (org.dresdenocl.language.ocl.resource.ocl.IOclReferenceMapping<EObject> mapping : mappings) {
Image image = null;
if (mapping instanceof org.dresdenocl.language.ocl.resource.ocl.mopp.OclElementMapping<?>) {
org.dresdenocl.language.ocl.resource.ocl.mopp.OclElementMapping<?> elementMapping = (org.dresdenocl.language.ocl.resource.ocl.mopp.OclElementMapping<?>) mapping;
Object target = elementMapping.getTargetElement();
// de-resolve reference to obtain correct identifier
org.dresdenocl.language.ocl.resource.ocl.IOclTokenResolver tokenResolver = tokenResolverFactory.createTokenResolver(tokenName);
final String identifier = tokenResolver.deResolve(elementMapping.getIdentifier(), reference, container);
if (target instanceof EObject) {
image = getImage((EObject) target);
}
boolean matchesPrefix = matches(identifier, prefix);
org.dresdenocl.language.ocl.resource.ocl.ui.OclCompletionProposal proposal = new org.dresdenocl.language.ocl.resource.ocl.ui.OclCompletionProposal(expectedTerminal, identifier, prefix, matchesPrefix, reference, container, image);
proposal.setReferenceTarget(target);
resultSet.add(proposal);
}
}
return resultSet;
}
return Collections.emptyList();
}
protected Collection<org.dresdenocl.language.ocl.resource.ocl.ui.OclCompletionProposal> handleAttribute(org.dresdenocl.language.ocl.resource.ocl.mopp.OclExpectedTerminal expectedTerminal, org.dresdenocl.language.ocl.resource.ocl.mopp.OclExpectedStructuralFeature expectedFeature, EObject container, EAttribute attribute, String prefix) {
Collection<org.dresdenocl.language.ocl.resource.ocl.ui.OclCompletionProposal> resultSet = new LinkedHashSet<org.dresdenocl.language.ocl.resource.ocl.ui.OclCompletionProposal>();
Object[] defaultValues = attributeValueProvider.getDefaultValues(attribute);
if (defaultValues != null) {
for (Object defaultValue : defaultValues) {
if (defaultValue != null) {
org.dresdenocl.language.ocl.resource.ocl.IOclTokenResolverFactory tokenResolverFactory = metaInformation.getTokenResolverFactory();
String tokenName = expectedFeature.getTokenName();
if (tokenName != null) {
org.dresdenocl.language.ocl.resource.ocl.IOclTokenResolver tokenResolver = tokenResolverFactory.createTokenResolver(tokenName);
if (tokenResolver != null) {
String defaultValueAsString = tokenResolver.deResolve(defaultValue, attribute, container);
boolean matchesPrefix = matches(defaultValueAsString, prefix);
resultSet.add(new org.dresdenocl.language.ocl.resource.ocl.ui.OclCompletionProposal(expectedTerminal, defaultValueAsString, prefix, matchesPrefix, expectedFeature.getFeature(), container));
}
}
}
}
}
return resultSet;
}
/**
* Creates a set of completion proposals from the given keyword.
*/
protected Collection<org.dresdenocl.language.ocl.resource.ocl.ui.OclCompletionProposal> handleKeyword(org.dresdenocl.language.ocl.resource.ocl.mopp.OclExpectedTerminal expectedTerminal, org.dresdenocl.language.ocl.resource.ocl.mopp.OclExpectedCsString csString, String prefix, EObject container) {
String proposal = csString.getValue();
boolean matchesPrefix = matches(proposal, prefix);
return Collections.singleton(new org.dresdenocl.language.ocl.resource.ocl.ui.OclCompletionProposal(expectedTerminal, proposal, prefix, matchesPrefix, null, container));
}
/**
* Creates a set of (two) completion proposals from the given boolean terminal.
*/
protected Collection<org.dresdenocl.language.ocl.resource.ocl.ui.OclCompletionProposal> handleBooleanTerminal(org.dresdenocl.language.ocl.resource.ocl.mopp.OclExpectedTerminal expectedTerminal, org.dresdenocl.language.ocl.resource.ocl.mopp.OclExpectedBooleanTerminal expectedBooleanTerminal, String prefix) {
Collection<org.dresdenocl.language.ocl.resource.ocl.ui.OclCompletionProposal> result = new LinkedHashSet<org.dresdenocl.language.ocl.resource.ocl.ui.OclCompletionProposal>(2);
org.dresdenocl.language.ocl.resource.ocl.grammar.OclBooleanTerminal booleanTerminal = expectedBooleanTerminal.getBooleanTerminal();
result.addAll(handleLiteral(expectedTerminal, booleanTerminal.getAttribute(), prefix, booleanTerminal.getTrueLiteral()));
result.addAll(handleLiteral(expectedTerminal, booleanTerminal.getAttribute(), prefix, booleanTerminal.getFalseLiteral()));
return result;
}
/**
* Creates a set of completion proposals from the given enumeration terminal. For
* each enumeration literal one proposal is created.
*/
protected Collection<org.dresdenocl.language.ocl.resource.ocl.ui.OclCompletionProposal> handleEnumerationTerminal(org.dresdenocl.language.ocl.resource.ocl.mopp.OclExpectedTerminal expectedTerminal, org.dresdenocl.language.ocl.resource.ocl.mopp.OclExpectedEnumerationTerminal expectedEnumerationTerminal, String prefix) {
Collection<org.dresdenocl.language.ocl.resource.ocl.ui.OclCompletionProposal> result = new LinkedHashSet<org.dresdenocl.language.ocl.resource.ocl.ui.OclCompletionProposal>(2);
org.dresdenocl.language.ocl.resource.ocl.grammar.OclEnumerationTerminal enumerationTerminal = expectedEnumerationTerminal.getEnumerationTerminal();
Map<String, String> literalMapping = enumerationTerminal.getLiteralMapping();
for (String literalName : literalMapping.keySet()) {
result.addAll(handleLiteral(expectedTerminal, enumerationTerminal.getAttribute(), prefix, literalMapping.get(literalName)));
}
return result;
}
protected Collection<org.dresdenocl.language.ocl.resource.ocl.ui.OclCompletionProposal> handleLiteral(org.dresdenocl.language.ocl.resource.ocl.mopp.OclExpectedTerminal expectedTerminal, EAttribute attribute, String prefix, String literal) {
if ("".equals(literal)) {
return Collections.emptySet();
}
boolean matchesPrefix = matches(literal, prefix);
return Collections.singleton(new org.dresdenocl.language.ocl.resource.ocl.ui.OclCompletionProposal(expectedTerminal, literal, prefix, matchesPrefix, null, null));
}
/**
* Calculates the prefix for each given expected element. The prefix depends on
* the current document content, the cursor position, and the position where the
* element is expected.
*/
protected void setPrefixes(List<org.dresdenocl.language.ocl.resource.ocl.mopp.OclExpectedTerminal> expectedElements, String content, int cursorOffset) {
if (cursorOffset < 0) {
return;
}
for (org.dresdenocl.language.ocl.resource.ocl.mopp.OclExpectedTerminal expectedElement : expectedElements) {
String prefix = findPrefix(expectedElements, expectedElement, content, cursorOffset);
expectedElement.setPrefix(prefix);
}
}
public org.dresdenocl.language.ocl.resource.ocl.mopp.OclExpectedTerminal[] getElementsExpectedAt(org.dresdenocl.language.ocl.resource.ocl.mopp.OclExpectedTerminal[] allExpectedElements, int cursorOffset) {
List<org.dresdenocl.language.ocl.resource.ocl.mopp.OclExpectedTerminal> expectedAtCursor = new ArrayList<org.dresdenocl.language.ocl.resource.ocl.mopp.OclExpectedTerminal>();
for (int i = 0; i < allExpectedElements.length; i++) {
org.dresdenocl.language.ocl.resource.ocl.mopp.OclExpectedTerminal expectedElement = allExpectedElements[i];
int startIncludingHidden = expectedElement.getStartIncludingHiddenTokens();
int end = getEnd(allExpectedElements, i);
if (cursorOffset >= startIncludingHidden && cursorOffset <= end) {
expectedAtCursor.add(expectedElement);
}
}
return expectedAtCursor.toArray(new org.dresdenocl.language.ocl.resource.ocl.mopp.OclExpectedTerminal[expectedAtCursor.size()]);
}
/**
* Calculates the end index of the expected element at allExpectedElements[index].
* To determine the end, the subsequent expected elements from the array of all
* expected elements are used. An element is considered to end one character
* before the next elements starts.
*/
protected int getEnd(org.dresdenocl.language.ocl.resource.ocl.mopp.OclExpectedTerminal[] allExpectedElements, int indexInList) {
org.dresdenocl.language.ocl.resource.ocl.mopp.OclExpectedTerminal elementAtIndex = allExpectedElements[indexInList];
int startIncludingHidden = elementAtIndex.getStartIncludingHiddenTokens();
int startExcludingHidden = elementAtIndex.getStartExcludingHiddenTokens();
for (int i = indexInList + 1; i < allExpectedElements.length; i++) {
org.dresdenocl.language.ocl.resource.ocl.mopp.OclExpectedTerminal elementAtI = allExpectedElements[i];
int startIncludingHiddenForI = elementAtI.getStartIncludingHiddenTokens();
int startExcludingHiddenForI = elementAtI.getStartExcludingHiddenTokens();
if (startIncludingHidden != startIncludingHiddenForI || startExcludingHidden != startExcludingHiddenForI) {
return startIncludingHiddenForI - 1;
}
}
return Integer.MAX_VALUE;
}
/**
* Checks whether the given proposed string matches the prefix. The two strings
* are compared ignoring the case. The prefix is also considered to match if is a
* camel case representation of the proposal.
*/
protected boolean matches(String proposal, String prefix) {
if (proposal == null || prefix == null) {
return false;
}
return (proposal.toLowerCase().startsWith(prefix.toLowerCase()) || org.dresdenocl.language.ocl.resource.ocl.util.OclStringUtil.matchCamelCase(prefix, proposal) != null) && !proposal.equals(prefix);
}
protected Image getImage(EObject element) {
if (!Platform.isRunning()) {
return null;
}
ComposedAdapterFactory adapterFactory = new ComposedAdapterFactory(ComposedAdapterFactory.Descriptor.Registry.INSTANCE);
adapterFactory.addAdapterFactory(new ResourceItemProviderAdapterFactory());
adapterFactory.addAdapterFactory(new EcoreItemProviderAdapterFactory());
adapterFactory.addAdapterFactory(new ReflectiveItemProviderAdapterFactory());
AdapterFactoryLabelProvider labelProvider = new AdapterFactoryLabelProvider(adapterFactory);
return labelProvider.getImage(element);
}
protected EObject findCorrectContainer(org.dresdenocl.language.ocl.resource.ocl.mopp.OclExpectedTerminal 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.dresdenocl.language.ocl.resource.ocl.grammar.OclContainmentTrace containmentTrace = expectedTerminal.getContainmentTrace();
EClass startClass = containmentTrace.getStartClass();
org.dresdenocl.language.ocl.resource.ocl.mopp.OclContainedFeature currentLink = null;
org.dresdenocl.language.ocl.resource.ocl.mopp.OclContainedFeature previousLink = null;
org.dresdenocl.language.ocl.resource.ocl.mopp.OclContainedFeature[] 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.dresdenocl.language.ocl.resource.ocl.mopp.OclContainedFeature link = previousLink;
org.dresdenocl.language.ocl.resource.ocl.util.OclEObjectUtil.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.dresdenocl.language.ocl.resource.ocl.util.OclEObjectUtil.setFeature(finalHookableParent, finalFeature, finalParent, false);
}
});
}
return correctContainer;
}
/**
* Walks up the containment hierarchy to find an EObject that is able to hold
* (contain) the given object.
*/
protected EObject findHookParent(EObject container, EClass startClass, org.dresdenocl.language.ocl.resource.ocl.mopp.OclContainedFeature currentLink, EObject object) {
EClass containerClass = currentLink.getContainerClass();
while (container != null) {
if (containerClass.isInstance(object)) {
if (startClass.equals(container.eClass())) {
return container;
}
}
container = container.eContainer();
}
return null;
}
}