Examples with ParseResult org.eclipse.xtext.parser.ParseResult used on opensource projects

Example 1 with ParseResult

use of org.eclipse.xtext.parser.ParseResult in project xtext-core by eclipse.

the class AbstractInternalAntlrParser method parse.

public final IParseResult parse(String entryRuleName) throws RecognitionException {
    long time = System.currentTimeMillis();
    IParseResult result = null;
    EObject current = null;
    String completeContent = input.toString();
    if (// who had the crazy idea to return null from toString() ...
    completeContent == null)
        completeContent = "";
    currentNode = nodeBuilder.newRootNode(completeContent);
    String antlrEntryRuleName = normalizeEntryRuleName(entryRuleName);
    try {
        Method method = this.getClass().getMethod(antlrEntryRuleName);
        method.setAccessible(true);
        Object parseResult = method.invoke(this);
        if (parseResult instanceof EObject)
            current = (EObject) parseResult;
        appendSkippedTokens();
        appendTrailingHiddenTokens();
        try {
            appendAllTokens();
        } finally {
            ICompositeNode root = nodeBuilder.compressAndReturnParent(currentNode);
            result = new ParseResult(current, root, hadErrors);
        }
    } catch (InvocationTargetException ite) {
        Throwable targetException = ite.getTargetException();
        if (targetException instanceof RecognitionException) {
            try {
                appendAllTokens();
            } finally {
                ICompositeNode root = nodeBuilder.compressAndReturnParent(currentNode);
                result = new ParseResult(current, root, hadErrors);
            }
            throw (RecognitionException) targetException;
        }
        if (targetException instanceof Exception) {
            throw new WrappedException((Exception) targetException);
        }
        throw new RuntimeException(targetException);
    } catch (Exception e) {
        throw new WrappedException(e);
    } finally {
        if (logger.isDebugEnabled()) {
            logger.debug("Parsing took: " + (System.currentTimeMillis() - time) + " ms");
        }
    }
    return result;
}

Example 2 with ParseResult

use of org.eclipse.xtext.parser.ParseResult in project xtext-core by eclipse.

the class PartialParsingHelper method reparse.

@Override
@SuppressWarnings({ "unchecked", "rawtypes" })
public IParseResult reparse(IParser parser, IParseResult previousParseResult, ReplaceRegion changedRegion) {
    if (parser == null)
        throw new NullPointerException("parser may not be null");
    if (previousParseResult == null) {
        throw new NullPointerException("previousParseResult and previousParseResult.rootNode may not be null");
    }
    ICompositeNode oldRootNode = previousParseResult.getRootNode();
    if (changedRegion.getEndOffset() > oldRootNode.getTotalLength()) {
        log.error("Invalid " + changedRegion + " originalLength=" + oldRootNode.getTotalLength());
        return fullyReparse(parser, previousParseResult, changedRegion);
    }
    if (changedRegion.getOffset() >= oldRootNode.getTotalLength() && changedRegion.getText().trim().length() == 0) {
        return fullyReparse(parser, previousParseResult, changedRegion);
    }
    ReplaceRegion replaceRegion;
    if (tokenRegionProvider != null) {
        replaceRegion = tokenRegionProvider.getTokenReplaceRegion(insertChangeIntoReplaceRegion(oldRootNode, changedRegion), changedRegion);
    } else {
        replaceRegion = changedRegion;
    }
    if (isNullEdit(oldRootNode, replaceRegion)) {
        return previousParseResult;
    }
    PartialParsingPointers parsingPointers = calculatePartialParsingPointers(previousParseResult, replaceRegion.getOffset(), replaceRegion.getLength());
    List<ICompositeNode> validReplaceRootNodes = parsingPointers.getValidReplaceRootNodes();
    ICompositeNode oldCompositeNode = null;
    String reparseRegion = "";
    for (int i = validReplaceRootNodes.size() - 1; i >= 0; --i) {
        oldCompositeNode = validReplaceRootNodes.get(i);
        if (!(oldCompositeNode instanceof SyntheticCompositeNode) && !isRangePartOfExceedingLookAhead((CompositeNode) oldCompositeNode, replaceRegion)) {
            boolean replaceAtEnd = oldCompositeNode.getTotalEndOffset() == replaceRegion.getEndOffset();
            reparseRegion = insertChangeIntoReplaceRegion(oldCompositeNode, replaceRegion);
            if (!"".equals(reparseRegion)) {
                if (!replaceAtEnd || !Character.isWhitespace(reparseRegion.charAt(reparseRegion.length() - 1))) {
                    if (log.isDebugEnabled()) {
                        log.debug("replace region: [" + oldCompositeNode.getTotalOffset() + " / length: " + oldCompositeNode.getTotalLength() + " of [" + oldRootNode.getTotalOffset() + " / lenght: " + oldRootNode.getTotalLength() + "]");
                    }
                    break;
                }
            }
        }
    }
    if (oldCompositeNode == null || reparseRegion.equals("") || oldCompositeNode == oldRootNode) {
        return fullyReparse(parser, previousParseResult, replaceRegion);
    }
    EObject entryRuleOrRuleCall = parsingPointers.findEntryRuleOrRuleCall(oldCompositeNode);
    IParseResult newParseResult = null;
    try {
        if (entryRuleOrRuleCall instanceof RuleCall)
            newParseResult = parser.parse((RuleCall) entryRuleOrRuleCall, new StringReader(reparseRegion), oldCompositeNode.getLookAhead());
        else
            newParseResult = parser.parse((ParserRule) entryRuleOrRuleCall, new StringReader(reparseRegion));
    } catch (ParseException exc) {
    }
    if (newParseResult == null || newParseResult.hasSyntaxErrors()) {
        // on error fully reparse
        return fullyReparse(parser, previousParseResult, replaceRegion);
    }
    if (oldRootNode.equals(oldCompositeNode)) {
        unloadSemanticObject(previousParseResult.getRootASTElement());
        return newParseResult;
    }
    EObject oldSemanticParentElement = oldCompositeNode.getParent().getSemanticElement();
    EObject oldSemanticElement = null;
    if (oldCompositeNode.hasDirectSemanticElement()) {
        oldSemanticElement = oldCompositeNode.getSemanticElement();
    } else {
        List<ICompositeNode> nodesEnclosingRegion = parsingPointers.getNodesEnclosingRegion();
        for (int i = nodesEnclosingRegion.size() - 1; i >= 0; --i) {
            ICompositeNode enclosingNode = nodesEnclosingRegion.get(i);
            if (enclosingNode == oldCompositeNode) {
                break;
            }
            if (enclosingNode.hasDirectSemanticElement())
                oldSemanticElement = enclosingNode.getSemanticElement();
        }
        if (oldSemanticElement == null)
            return fullyReparse(parser, previousParseResult, replaceRegion);
    }
    if (oldSemanticElement == oldSemanticParentElement) {
        throw new IllegalStateException("oldParent == oldElement");
    }
    if (oldSemanticParentElement != null) {
        EStructuralFeature feature = oldSemanticElement.eContainingFeature();
        if (feature == null)
            return fullyReparse(parser, previousParseResult, replaceRegion);
        oldSemanticParentElement = oldSemanticElement.eContainer();
        if (feature.isMany()) {
            List featureValueList = (List) oldSemanticParentElement.eGet(feature);
            int index = featureValueList.indexOf(oldSemanticElement);
            unloadSemanticObject(oldSemanticElement);
            EObject newSemanticObject = newParseResult.getRootASTElement();
            if (newSemanticObject != null) {
                featureValueList.set(index, newParseResult.getRootASTElement());
            } else {
                featureValueList.remove(index);
            }
        } else {
            unloadSemanticObject(oldSemanticElement);
            oldSemanticParentElement.eSet(feature, newParseResult.getRootASTElement());
        }
        ((ParseResult) newParseResult).setRootASTElement(previousParseResult.getRootASTElement());
    } else {
        unloadSemanticObject(oldSemanticElement);
    }
    if (oldCompositeNode != oldRootNode) {
        nodeModelBuilder.replaceAndTransferLookAhead(oldCompositeNode, newParseResult.getRootNode());
        ((ParseResult) newParseResult).setRootNode(oldRootNode);
        StringBuilder builder = new StringBuilder(oldRootNode.getText());
        replaceRegion.applyTo(builder);
        nodeModelBuilder.setCompleteContent(oldRootNode, builder.toString());
    }
    return newParseResult;
}

Example 3 with ParseResult

use of org.eclipse.xtext.parser.ParseResult in project xtext-core by eclipse.

the class ResourceStorageLoadable method readNodeModel.

protected void readNodeModel(final StorageAwareResource resource, final InputStream inputStream) throws IOException {
    final SerializableNodeModel serializableNodeModel = new SerializableNodeModel(resource);
    boolean _exists = resource.getResourceSet().getURIConverter().exists(resource.getURI(), resource.getResourceSet().getLoadOptions());
    boolean _not = (!_exists);
    if (_not) {
        URI _uRI = resource.getURI();
        String _plus = ("Skipping loading node model for synthetic resource " + _uRI);
        ResourceStorageLoadable.LOG.info(_plus);
        return;
    }
    final InputStream stream = resource.getResourceSet().getURIConverter().createInputStream(resource.getURI());
    String _encoding = resource.getEncoding();
    final InputStreamReader in = new InputStreamReader(stream, _encoding);
    final String completeContent = CharStreams.toString(in);
    final DeserializationConversionContext deserializationContext = new DeserializationConversionContext(resource, completeContent);
    final DataInputStream dataIn = new DataInputStream(inputStream);
    serializableNodeModel.readObjectData(dataIn, deserializationContext);
    EObject _head = IterableExtensions.<EObject>head(resource.getContents());
    boolean _hasErrors = deserializationContext.hasErrors();
    ParseResult _parseResult = new ParseResult(_head, serializableNodeModel.root, _hasErrors);
    resource.setParseResult(_parseResult);
}