Examples with AbstractElement org.eclipse.xtext.AbstractElement used on opensource projects

Example 6 with AbstractElement

use of org.eclipse.xtext.AbstractElement in project xtext-core by eclipse.

the class InsertionPointFinder method findInsertionPoint.

public IHiddenRegion findInsertionPoint(ISerializationContext ctx, IEObjectRegion obj, AbstractElement ins) {
    ISerState insertionState = findState(ctx, ins);
    Set<AbstractElement> followers = collectAdjacent(insertionState, s -> s.getFollowers());
    Set<AbstractElement> precendents = collectAdjacent(insertionState, s -> s.getPrecedents());
    List<IAstRegion> regions = Lists.newArrayList(obj.getAstRegions());
    if (regions.isEmpty()) {
        return obj.getPreviousHiddenRegion();
    }
    if (followers.contains(regions.get(0).getGrammarElement())) {
        return obj.getPreviousHiddenRegion();
    }
    if (precendents.contains(regions.get(regions.size() - 1).getGrammarElement())) {
        return obj.getNextHiddenRegion();
    }
    for (int i = 0; i < regions.size() - 1; i++) {
        IAstRegion leading = regions.get(i);
        IAstRegion trailing = regions.get(i + 1);
        if (precendents.contains(leading.getGrammarElement()) && followers.contains(trailing.getGrammarElement())) {
            return leading.getNextHiddenRegion();
        }
    }
    return null;
}

Example 7 with AbstractElement

use of org.eclipse.xtext.AbstractElement in project xtext-core by eclipse.

the class InsertionPointFinder method collectAdjacent.

protected Set<AbstractElement> collectAdjacent(ISerState start, Function<ISerState, List<? extends ISerState>> followers) {
    LinkedList<ISerState> todo = new LinkedList<>();
    Set<ISerState> seen = Sets.newHashSet();
    todo.addAll(followers.apply(start));
    Set<AbstractElement> result = Sets.newLinkedHashSet();
    while (!todo.isEmpty()) {
        ISerState next = todo.pop();
        if (!seen.add(next)) {
            continue;
        }
        if (next.getType() == SerStateType.ELEMENT && !GrammarUtil.isUnassignedAction(next.getGrammarElement())) {
            result.add(next.getGrammarElement());
        } else {
            todo.addAll(followers.apply(next));
        }
    }
    return result;
}

Example 8 with AbstractElement

use of org.eclipse.xtext.AbstractElement in project xtext-core by eclipse.

the class IndentationAwareCompletionPrefixProvider method getLastCompleteNodeByOffset.

protected INode getLastCompleteNodeByOffset(INode node, int offset) {
    BidiTreeIterator<INode> iterator = node.getRootNode().getAsTreeIterable().iterator();
    INode result = node;
    ITextRegion candidateTextRegion = node.getTextRegion();
    while (iterator.hasNext()) {
        INode candidate = iterator.next();
        ITextRegion textRegion = candidate.getTextRegion();
        if (textRegion.getOffset() >= offset && !(textRegion.getOffset() == offset && textRegion.getLength() == 0)) {
            if (!candidateTextRegion.equals(textRegion) && candidate instanceof ILeafNode && textRegion.getLength() + textRegion.getOffset() >= offset) {
                break;
            }
        }
        if ((candidate instanceof ILeafNode) && (candidate.getGrammarElement() == null || candidate.getGrammarElement() instanceof AbstractElement || candidate.getGrammarElement() instanceof ParserRule)) {
            if (textRegion.getLength() == 0) {
                if (candidateTextRegion.getOffset() + candidateTextRegion.getLength() < offset || candidateTextRegion.getLength() == 0 && candidateTextRegion.getOffset() <= offset) {
                    result = candidate;
                    candidateTextRegion = candidate.getTextRegion();
                }
            } else {
                result = candidate;
                candidateTextRegion = candidate.getTextRegion();
            }
        }
    }
    return result;
}

Example 9 with AbstractElement

use of org.eclipse.xtext.AbstractElement in project xtext-core by eclipse.

the class BaseContentAssistParser method getInitializedUnorderedGroupHelper.

/**
 * @since 2.14
 */
protected IUnorderedGroupHelper getInitializedUnorderedGroupHelper(FE element, InternalParser parser, UnorderedGroup group) {
    final IUnorderedGroupHelper helper = parser.getUnorderedGroupHelper();
    helper.enter(group);
    for (AbstractElement consumed : element.getHandledUnorderedGroupElements()) {
        parser.before(consumed);
        helper.select(group, group.getElements().indexOf(consumed));
        helper.returnFromSelection(group);
        parser.after(consumed);
    }
    return helper;
}

Example 10 with AbstractElement

use of org.eclipse.xtext.AbstractElement in project xtext-core by eclipse.

the class BaseContentAssistParser method getFollowElements.

public Collection<FE> getFollowElements(FE element) {
    if (element.getLookAhead() <= 1)
        throw new IllegalArgumentException("lookahead may not be less than or equal to 1");
    Collection<FE> result = new ArrayList<FE>();
    for (AbstractElement elementToParse : getElementsToParse(element)) {
        elementToParse = unwrapSingleElementGroups(elementToParse);
        String ruleName = getRuleName(elementToParse);
        String[][] allRuleNames = getRequiredRuleNames(ruleName, element.getParamStack(), elementToParse);
        for (String[] ruleNames : allRuleNames) {
            for (int i = 0; i < ruleNames.length; i++) {
                InternalParser parser = createParser();
                parser.setUnorderedGroupHelper(createUnorderedGroupHelper());
                parser.getUnorderedGroupHelper().initializeWith(parser);
                ObservableXtextTokenStream tokens = setTokensFromFollowElement(parser, element);
                tokens.setListener(parser);
                parser.getGrammarElements().addAll(element.getTrace());
                parser.getGrammarElements().add(elementToParse);
                parser.getLocalTrace().addAll(element.getLocalTrace());
                parser.getLocalTrace().add(elementToParse);
                parser.getParamStack().addAll(element.getParamStack());
                if (elementToParse instanceof UnorderedGroup && element.getGrammarElement() == elementToParse) {
                    UnorderedGroup group = (UnorderedGroup) elementToParse;
                    IUnorderedGroupHelper helper = getInitializedUnorderedGroupHelper(element, parser, group);
                    parser.setUnorderedGroupHelper(ignoreFirstEntrance(helper));
                }
                Collection<FE> elements = getFollowElements(parser, elementToParse, ruleNames, i);
                result.addAll(elements);
            }
        }
    }
    return result;
}