Examples with HybridInterpreter org.strategoxt.HybridInterpreter used on opensource projects

Example 6 with HybridInterpreter

use of org.strategoxt.HybridInterpreter in project spoofax by metaborg.

the class ConstraintMultiFileAnalyzer method analyzeSemiIncremental.

private ISpoofaxAnalyzeResults analyzeSemiIncremental(Map<String, ISpoofaxParseUnit> changed, java.util.Set<String> removed, IMultiFileScopeGraphContext context, HybridInterpreter runtime, String strategy, IProgress progress, ICancel cancel) throws AnalysisException {
    final NaBL2DebugConfig debugConfig = context.config().debug();
    final Timer totalTimer = new Timer(true);
    final AggregateTimer collectionTimer = new AggregateTimer();
    final AggregateTimer solverTimer = new AggregateTimer();
    final AggregateTimer finalizeTimer = new AggregateTimer();
    final String globalSource = "";
    final Function1<String, String> globalFresh = base -> context.unit(globalSource).fresh().fresh(base);
    for (String input : removed) {
        context.removeUnit(input);
    }
    final int n = changed.size();
    final int w = context.units().size() / 2;
    progress.setWorkRemaining(n + w + 1);
    if (debugConfig.analysis() || debugConfig.files()) {
        logger.info("Analyzing {} files in {}.", n, context.location());
    }
    final Collection<ISpoofaxAnalyzeUnit> results = Lists.newArrayList();
    final Collection<ISpoofaxAnalyzeUnitUpdate> updateResults = Lists.newArrayList();
    try {
        // initial
        InitialResult initialResult;
        final Optional<ITerm> customInitial;
        {
            if (debugConfig.collection()) {
                logger.info("Collecting initial constraints.");
            }
            if (context.initialResult().isPresent()) {
                initialResult = context.initialResult().get();
                customInitial = context.initialResult().flatMap(r -> r.getCustomResult());
            } else {
                collectionTimer.start();
                try {
                    final ITerm globalAST = Actions.sourceTerm(globalSource, B.EMPTY_TUPLE);
                    ITerm initialResultTerm = doAction(strategy, Actions.analyzeInitial(globalSource, globalAST), context, runtime).orElseThrow(() -> new AnalysisException(context, "No initial result."));
                    initialResult = InitialResult.matcher().match(initialResultTerm).orElseThrow(() -> new AnalysisException(context, "Invalid initial results."));
                    customInitial = doCustomAction(strategy, Actions.customInitial(globalSource, globalAST), context, runtime);
                    initialResult = initialResult.withCustomResult(customInitial);
                    context.setInitialResult(initialResult);
                } finally {
                    collectionTimer.stop();
                }
            }
            if (debugConfig.collection()) {
                logger.info("Initial constraints collected.");
            }
        }
        // global parameters, that form the interface for a single unit
        final java.util.Set<ITermVar> intfVars = Sets.newHashSet();
        {
            initialResult.getArgs().getParams().stream().forEach(param -> intfVars.addAll(param.getVars()));
            initialResult.getArgs().getType().ifPresent(type -> intfVars.addAll(type.getVars()));
        }
        final SemiIncrementalMultiFileSolver solver = new SemiIncrementalMultiFileSolver(context.config().debug(), callExternal(runtime));
        // global
        ISolution initialSolution;
        {
            if (context.initialSolution().isPresent()) {
                initialSolution = context.initialSolution().get();
            } else {
                try {
                    solverTimer.start();
                    final IProgress subprogress = progress.subProgress(1);
                    GraphSolution preSolution = solver.solveGraph(ImmutableBaseSolution.of(initialResult.getConfig(), initialResult.getConstraints(), PersistentUnifier.Immutable.of()), globalFresh, cancel, subprogress);
                    preSolution = solver.reportUnsolvedGraphConstraints(preSolution);
                    initialSolution = solver.solveIntra(preSolution, intfVars, null, globalFresh, cancel, subprogress);
                    if (debugConfig.resolution()) {
                        logger.info("Reduced file constraints to {}.", initialSolution.constraints().size());
                    }
                } catch (SolverException e) {
                    throw new AnalysisException(context, e);
                } finally {
                    solverTimer.stop();
                }
                context.setInitialSolution(initialSolution);
            }
        }
        final java.util.Set<Scope> intfScopes = Sets.newHashSet();
        {
            initialResult.getArgs().getParams().stream().forEach(param -> Scope.matcher().match(param, initialSolution.unifier()).ifPresent(intfScopes::add));
        }
        // units
        final Map<String, IStrategoTerm> astsByFile = Maps.newHashMap();
        final Map<String, IMessage> failures = Maps.newHashMap();
        final Multimap<String, IMessage> ambiguitiesByFile = HashMultimap.create();
        for (Map.Entry<String, ISpoofaxParseUnit> input : changed.entrySet()) {
            final String source = input.getKey();
            final ISpoofaxParseUnit parseUnit = input.getValue();
            final ITerm ast = strategoTerms.fromStratego(parseUnit.ast());
            if (debugConfig.files()) {
                logger.info("Analyzing {}.", source);
            }
            final IMultiFileScopeGraphUnit unit = context.unit(source);
            unit.clear();
            try {
                UnitResult unitResult;
                final Optional<ITerm> customUnit;
                {
                    if (debugConfig.collection()) {
                        logger.info("Collecting constraints of {}.", source);
                    }
                    try {
                        collectionTimer.start();
                        final ITerm unitResultTerm = doAction(strategy, Actions.analyzeUnit(source, ast, initialResult.getArgs()), context, runtime).orElseThrow(() -> new AnalysisException(context, "No unit result."));
                        unitResult = UnitResult.matcher().match(unitResultTerm).orElseThrow(() -> new MetaborgException("Invalid unit results."));
                        final ITerm desugaredAST = unitResult.getAST();
                        customUnit = doCustomAction(strategy, Actions.customUnit(source, desugaredAST, customInitial.orElse(B.EMPTY_TUPLE)), context, runtime);
                        unitResult = unitResult.withCustomResult(customUnit);
                        final IStrategoTerm analyzedAST = strategoTerms.toStratego(desugaredAST);
                        astsByFile.put(source, analyzedAST);
                        ambiguitiesByFile.putAll(source, analysisCommon.ambiguityMessages(parseUnit.source(), parseUnit.ast()));
                        unit.setUnitResult(unitResult);
                    } finally {
                        collectionTimer.stop();
                    }
                    if (debugConfig.collection()) {
                        logger.info("Collected {} constraints of {}.", unitResult.getConstraints().size(), source);
                    }
                }
                {
                    final ISolution unitSolution;
                    if (debugConfig.resolution()) {
                        logger.info("Reducing {} constraints of {}.", unitResult.getConstraints().size(), source);
                    }
                    try {
                        solverTimer.start();
                        final Function1<String, String> fresh = base -> context.unit(source).fresh().fresh(base);
                        final IProgress subprogress = progress.subProgress(1);
                        GraphSolution preSolution = solver.solveGraph(ImmutableBaseSolution.of(initialResult.getConfig(), unitResult.getConstraints(), initialSolution.unifier()), fresh, cancel, subprogress);
                        preSolution = solver.reportUnsolvedGraphConstraints(preSolution);
                        unitSolution = solver.solveIntra(preSolution, intfVars, intfScopes, fresh, cancel, subprogress);
                        if (debugConfig.resolution()) {
                            logger.info("Reduced file constraints to {}.", unitSolution.constraints().size());
                        }
                    } catch (SolverException e) {
                        throw new AnalysisException(context, e);
                    } finally {
                        solverTimer.stop();
                    }
                    unit.setPartialSolution(unitSolution);
                    if (debugConfig.files() || debugConfig.resolution()) {
                        logger.info("Analyzed {}: {} errors, {} warnings, {} notes, {} unsolved constraints.", source, unitSolution.messages().getErrors().size(), unitSolution.messages().getWarnings().size(), unitSolution.messages().getNotes().size(), unitSolution.constraints().size());
                    }
                }
            } catch (MetaborgException e) {
                logger.warn("Analysis of " + source + " failed.", e);
                failures.put(source, MessageFactory.newAnalysisErrorAtTop(parseUnit.source(), "File analysis failed.", e));
            }
        }
        // solve
        final ISolution solution;
        final List<Optional<ITerm>> customUnits = Lists.newArrayList();
        {
            final List<ISolution> partialSolutions = Lists.newArrayList();
            for (IMultiFileScopeGraphUnit unit : context.units()) {
                unit.partialSolution().ifPresent(partialSolutions::add);
                unit.unitResult().map(UnitResult::getCustomResult).ifPresent(customUnits::add);
            }
            if (debugConfig.resolution()) {
                logger.info("Solving {} partial solutions.", partialSolutions.size());
            }
            ISolution sol;
            try {
                solverTimer.start();
                Function1<String, String> fresh = base -> context.unit(globalSource).fresh().fresh(base);
                IMessageInfo message = ImmutableMessageInfo.of(MessageKind.ERROR, MessageContent.of(), Actions.sourceTerm(globalSource));
                sol = solver.solveInter(initialSolution, partialSolutions, message, fresh, cancel, progress.subProgress(w));
                sol = solver.reportUnsolvedConstraints(sol);
            } catch (SolverException e) {
                throw new AnalysisException(context, e);
            } finally {
                solverTimer.stop();
            }
            if (!sol.flowSpecSolution().controlFlowGraph().isEmpty()) {
                logger.debug("CFG is not empty: calling FlowSpec dataflow solver");
                sol = new FixedPoint().entryPoint(sol, getFlowSpecTransferFunctions(context.language()));
            }
            solution = sol;
            context.setSolution(solution);
            if (debugConfig.resolution()) {
                logger.info("Project constraints solved.");
            }
        }
        // final
        FinalResult finalResult;
        final Optional<ITerm> customFinal;
        final Optional<CustomSolution> customSolution;
        {
            if (debugConfig.analysis()) {
                logger.info("Finalizing project analysis.");
            }
            finalizeTimer.start();
            try {
                ITerm finalResultTerm = doAction(strategy, Actions.analyzeFinal(globalSource), context, runtime).orElseThrow(() -> new AnalysisException(context, "No final result."));
                finalResult = FinalResult.matcher().match(finalResultTerm, solution.unifier()).orElseThrow(() -> new AnalysisException(context, "Invalid final results."));
                customFinal = doCustomAction(strategy, Actions.customFinal(globalSource, customInitial.orElse(B.EMPTY_TUPLE), Optionals.filter(customUnits)), context, runtime);
                finalResult = finalResult.withCustomResult(customFinal);
                context.setFinalResult(finalResult);
                customSolution = customFinal.flatMap(cs -> CustomSolution.matcher().match(cs, solution.unifier()));
                customSolution.ifPresent(cs -> context.setCustomSolution(cs));
            } finally {
                finalizeTimer.stop();
            }
            if (debugConfig.analysis()) {
                logger.info("Project analysis finalized.");
            }
        }
        // errors
        {
            if (debugConfig.analysis()) {
                logger.info("Processing project messages.");
            }
            Messages.Transient messageBuilder = Messages.Transient.of();
            messageBuilder.addAll(Messages.unsolvedErrors(solution.constraints()));
            messageBuilder.addAll(solution.messages().getAll());
            customSolution.map(CustomSolution::getMessages).map(IMessages::getAll).ifPresent(messageBuilder::addAll);
            IMessages messages = messageBuilder.freeze();
            IRelation3.Transient<String, MessageSeverity, IMessage> messagesByFile = HashTrieRelation3.Transient.of();
            messagesByFile(failures.values(), messagesByFile, context);
            messagesByFile(messages(messages.getAll(), solution.unifier(), context, context.location()), messagesByFile, context);
            // precondition: the messagesByFile should not contain any files that do not have corresponding units
            for (IMultiFileScopeGraphUnit unit : context.units()) {
                final String source = unit.resource();
                final java.util.Set<IMessage> fileMessages = messagesByFile.get(source).stream().map(Map.Entry::getValue).collect(Collectors2.toHashSet());
                if (changed.containsKey(source)) {
                    fileMessages.addAll(ambiguitiesByFile.get(source));
                    final boolean valid = !failures.containsKey(source);
                    final boolean success = valid && messagesByFile.get(source, MessageSeverity.ERROR).isEmpty();
                    final IStrategoTerm analyzedAST = astsByFile.get(source);
                    results.add(unitService.analyzeUnit(changed.get(source), new AnalyzeContrib(valid, success, analyzedAST != null, analyzedAST, fileMessages, -1), context));
                } else {
                    try {
                        final FileObject file = context.location().resolveFile(source);
                        updateResults.add(unitService.analyzeUnitUpdate(file, new AnalyzeUpdateData(fileMessages), context));
                    } catch (IOException ex) {
                        logger.error("Could not resolve {} to update messages", source);
                    }
                }
                messagesByFile.remove(source);
            }
            if (!messagesByFile.keySet().isEmpty()) {
                logger.error("Found messages for unanalyzed files {}", messagesByFile.keySet());
            }
            if (debugConfig.analysis() || debugConfig.files() || debugConfig.resolution()) {
                logger.info("Analyzed {} files: {} errors, {} warnings, {} notes.", n, messages.getErrors().size(), messages.getWarnings().size(), messages.getNotes().size());
            }
        }
    } catch (InterruptedException e) {
        logger.debug("Analysis was interrupted.");
    } finally {
        totalTimer.stop();
    }
    final ConstraintDebugData debugData = new ConstraintDebugData(totalTimer.stop(), collectionTimer.total(), solverTimer.total(), finalizeTimer.total());
    if (debugConfig.analysis()) {
        logger.info("{}", debugData);
    }
    return new SpoofaxAnalyzeResults(results, updateResults, context, debugData);
}

Example 7 with HybridInterpreter

use of org.strategoxt.HybridInterpreter in project spoofax by metaborg.

the class ConstraintSingleFileAnalyzer method analyzeAll.

@Override
protected ISpoofaxAnalyzeResults analyzeAll(Map<String, ISpoofaxParseUnit> changed, Set<String> removed, ISingleFileScopeGraphContext context, HybridInterpreter runtime, String strategy, IProgress progress, ICancel cancel) throws AnalysisException {
    final NaBL2DebugConfig debugConfig = context.config().debug();
    for (String input : removed) {
        context.removeUnit(input);
    }
    final int n = changed.size();
    progress.setWorkRemaining(n + 1);
    if (debugConfig.analysis() || debugConfig.files()) {
        logger.info("Analyzing {} files in {}.", n, context.location());
    }
    final Collection<ISpoofaxAnalyzeUnit> results = Lists.newArrayList();
    try {
        for (Map.Entry<String, ISpoofaxParseUnit> input : changed.entrySet()) {
            final String source = input.getKey();
            final ISpoofaxParseUnit parseUnit = input.getValue();
            final ITerm ast = strategoTerms.fromStratego(parseUnit.ast());
            if (debugConfig.files()) {
                logger.info("Analyzing {}.", source);
            }
            final ISingleFileScopeGraphUnit unit = context.unit(source);
            unit.clear();
            try {
                // initial
                InitialResult initialResult;
                final Optional<ITerm> customInitial;
                {
                    if (debugConfig.collection()) {
                        logger.info("Collecting initial constraints of {}.", source);
                    }
                    ITerm initialResultTerm = doAction(strategy, Actions.analyzeInitial(source, ast), context, runtime).orElseThrow(() -> new AnalysisException(context, "No initial result."));
                    initialResult = InitialResult.matcher().match(initialResultTerm).orElseThrow(() -> new MetaborgException("Invalid initial results."));
                    customInitial = doCustomAction(strategy, Actions.customInitial(source, ast), context, runtime);
                    initialResult = initialResult.withCustomResult(customInitial);
                    if (debugConfig.collection()) {
                        logger.info("Collected {} initial constraints of {}.", initialResult.getConstraints().size(), source);
                    }
                }
                // unit
                UnitResult unitResult;
                final Optional<ITerm> customUnit;
                {
                    if (debugConfig.collection()) {
                        logger.info("Collecting constraints of {}.", source);
                    }
                    final ITerm unitResultTerm = doAction(strategy, Actions.analyzeUnit(source, ast, initialResult.getArgs()), context, runtime).orElseThrow(() -> new AnalysisException(context, "No unit result."));
                    unitResult = UnitResult.matcher().match(unitResultTerm).orElseThrow(() -> new MetaborgException("Invalid unit results."));
                    final ITerm desugaredAST = unitResult.getAST();
                    customUnit = doCustomAction(strategy, Actions.customUnit(source, desugaredAST, customInitial.orElse(B.EMPTY_TUPLE)), context, runtime);
                    unitResult = unitResult.withCustomResult(customUnit);
                    unit.setUnitResult(unitResult);
                    if (debugConfig.collection()) {
                        logger.info("Collected {} constraints of {}.", unitResult.getConstraints().size(), source);
                    }
                }
                // solve
                ISolution solution;
                {
                    Set<IConstraint> constraints = Sets.union(initialResult.getConstraints(), unitResult.getConstraints());
                    if (debugConfig.resolution()) {
                        logger.info("Solving {} constraints of {}.", constraints.size(), source);
                    }
                    Function1<String, String> fresh = base -> context.unit(source).fresh().fresh(base);
                    final IProgress subprogress = progress.subProgress(1);
                    final SingleFileSolver solver = new SingleFileSolver(context.config().debug(), callExternal(runtime));
                    GraphSolution preSolution = solver.solveGraph(ImmutableBaseSolution.of(initialResult.getConfig(), constraints, PersistentUnifier.Immutable.of()), fresh, cancel, subprogress);
                    preSolution = solver.reportUnsolvedGraphConstraints(preSolution);
                    solution = solver.solve(preSolution, fresh, cancel, subprogress);
                    solution = solver.reportUnsolvedConstraints(solution);
                    if (!solution.flowSpecSolution().controlFlowGraph().isEmpty()) {
                        logger.debug("CFG is not empty: calling FlowSpec dataflow solver");
                        solution = new FixedPoint().entryPoint(solution, getFlowSpecTransferFunctions(context.language()));
                    }
                    unit.setSolution(solution);
                    if (debugConfig.resolution()) {
                        logger.info("Solved constraints of {}.", source);
                    }
                }
                // final
                FinalResult finalResult;
                final Optional<ITerm> customFinal;
                {
                    if (debugConfig.files()) {
                        logger.info("Finalizing analysis of {}.", source);
                    }
                    ITerm finalResultTerm = doAction(strategy, Actions.analyzeFinal(source), context, runtime).orElseThrow(() -> new AnalysisException(context, "No final result."));
                    finalResult = FinalResult.matcher().match(finalResultTerm).orElseThrow(() -> new MetaborgException("Invalid final results."));
                    customFinal = doCustomAction(strategy, Actions.customFinal(source, customInitial.orElse(B.EMPTY_TUPLE), customUnit.map(cu -> Collections.singletonList(cu)).orElse(Collections.emptyList())), context, runtime);
                    finalResult = finalResult.withCustomResult(customFinal);
                    unit.setFinalResult(finalResult);
                    if (debugConfig.files()) {
                        logger.info("Finalized analysis of {}.", source);
                    }
                }
                final IStrategoTerm analyzedAST = strategoTerms.toStratego(unitResult.getAST());
                Optional<CustomSolution> customSolution = customFinal.flatMap(CustomSolution.matcher()::match);
                customSolution.ifPresent(cs -> unit.setCustomSolution(cs));
                // errors
                final boolean success;
                {
                    if (debugConfig.files()) {
                        logger.info("Processing messages of {}.", source);
                    }
                    Messages.Transient messageBuilder = Messages.Transient.of();
                    messageBuilder.addAll(Messages.unsolvedErrors(solution.constraints()));
                    messageBuilder.addAll(solution.messages().getAll());
                    customSolution.map(CustomSolution::getMessages).map(IMessages::getAll).ifPresent(messageBuilder::addAll);
                    IMessages messages = messageBuilder.freeze();
                    success = messages.getErrors().isEmpty();
                    Iterable<IMessage> fileMessages = Iterables.concat(analysisCommon.ambiguityMessages(parseUnit.source(), parseUnit.ast()), messages(messages.getAll(), solution.unifier(), context, context.location()));
                    // result
                    results.add(unitService.analyzeUnit(parseUnit, new AnalyzeContrib(true, success, true, analyzedAST, fileMessages, -1), context));
                    if (debugConfig.analysis() || debugConfig.files()) {
                        logger.info("Analyzed {}: {} errors, {} warnings, {} notes.", source, messages.getErrors().size(), messages.getWarnings().size(), messages.getNotes().size());
                    }
                }
            } catch (MetaborgException | SolverException e) {
                logger.warn("Analysis of " + source + " failed.", e);
                Iterable<IMessage> messages = Iterables2.singleton(MessageFactory.newAnalysisErrorAtTop(parseUnit.source(), "File analysis failed.", e));
                results.add(unitService.analyzeUnit(parseUnit, new AnalyzeContrib(false, false, true, parseUnit.ast(), messages, -1), context));
            }
        }
    } catch (InterruptedException e) {
        logger.debug("Analysis was interrupted.");
    }
    if (debugConfig.analysis()) {
        logger.info("Analyzed {} files.", n);
    }
    return new SpoofaxAnalyzeResults(results, Collections.emptyList(), context);
}

Example 8 with HybridInterpreter

use of org.strategoxt.HybridInterpreter in project spoofax by metaborg.

the class StrategoAnalyzer method analyze.

@Override
public ISpoofaxAnalyzeResult analyze(ISpoofaxParseUnit input, IContext context, IProgress progress, ICancel cancel) throws AnalysisException, InterruptedException {
    cancel.throwIfCancelled();
    if (!input.valid()) {
        final String message = logger.format("Parse input for {} is invalid, cannot analyze", input.source());
        throw new AnalysisException(context, message);
    }
    final ILanguageImpl language = context.language();
    final ITermFactory termFactory = termFactoryService.getGeneric();
    final FacetContribution<AnalysisFacet> facetContribution = language.facetContribution(AnalysisFacet.class);
    if (facetContribution == null) {
        logger.debug("No analysis required for {}", language);
        final ISpoofaxAnalyzeUnit emptyUnit = unitService.emptyAnalyzeUnit(input, context);
        return new SpoofaxAnalyzeResult(emptyUnit, context);
    }
    final AnalysisFacet facet = facetContribution.facet;
    cancel.throwIfCancelled();
    final HybridInterpreter runtime;
    try {
        runtime = runtimeService.runtime(facetContribution.contributor, context, true);
    } catch (MetaborgException e) {
        throw new AnalysisException(context, "Failed to get Stratego runtime", e);
    }
    cancel.throwIfCancelled();
    final ISpoofaxAnalyzeUnit result = analyze(input, context, runtime, facet.strategyName, termFactory);
    return new SpoofaxAnalyzeResult(result, context);
}

Example 9 with HybridInterpreter

use of org.strategoxt.HybridInterpreter in project spoofax by metaborg.

the class StrategoAnalyzer method analyzeAll.

@Override
public ISpoofaxAnalyzeResults analyzeAll(Iterable<ISpoofaxParseUnit> inputs, IContext context, IProgress progress, ICancel cancel) throws AnalysisException, InterruptedException {
    cancel.throwIfCancelled();
    final ILanguageImpl language = context.language();
    final ITermFactory termFactory = termFactoryService.getGeneric();
    final FacetContribution<AnalysisFacet> facetContribution = language.facetContribution(AnalysisFacet.class);
    if (facetContribution == null) {
        logger.debug("No analysis required for {}", language);
        return new SpoofaxAnalyzeResults(context);
    }
    final AnalysisFacet facet = facetContribution.facet;
    cancel.throwIfCancelled();
    final HybridInterpreter runtime;
    try {
        runtime = runtimeService.runtime(facetContribution.contributor, context, true);
    } catch (MetaborgException e) {
        throw new AnalysisException(context, "Failed to get Stratego runtime", e);
    }
    final int size = Iterables.size(inputs);
    progress.setWorkRemaining(size);
    final Collection<ISpoofaxAnalyzeUnit> results = Lists.newArrayListWithCapacity(size);
    for (ISpoofaxParseUnit input : inputs) {
        cancel.throwIfCancelled();
        if (!input.valid()) {
            logger.warn("Parse input for {} is invalid, cannot analyze", input.source());
            // TODO: throw exception instead?
            progress.work(1);
            continue;
        }
        final ISpoofaxAnalyzeUnit result = analyze(input, context, runtime, facet.strategyName, termFactory);
        results.add(result);
        progress.work(1);
    }
    return new SpoofaxAnalyzeResults(results, context);
}

Example 10 with HybridInterpreter

use of org.strategoxt.HybridInterpreter in project spoofax by metaborg.

the class JSGLRCompletionService method recursiveCompletions.

private Collection<? extends ICompletion> recursiveCompletions(Iterable<IStrategoTerm> leftRecursive, Iterable<IStrategoTerm> rightRecursive, String languageName, ILanguageComponent component, FileObject location) throws MetaborgException {
    Collection<ICompletion> completions = Lists.newLinkedList();
    // call Stratego part of the framework to compute change
    final HybridInterpreter runtime = strategoRuntimeService.runtime(component, location, false);
    final ITermFactory termFactory = termFactoryService.get(component, null, false);
    for (IStrategoTerm term : leftRecursive) {
        IStrategoTerm sort = termFactory.makeString(ImploderAttachment.getSort(term));
        final IStrategoTerm strategoInput = termFactory.makeTuple(sort, term);
        IStrategoTerm proposals = null;
        try {
            proposals = strategoCommon.invoke(runtime, strategoInput, "get-proposals-left-recursive-" + languageName);
        } catch (Exception e) {
            logger.error("Getting proposals for {} failed", term);
            continue;
        }
        if (proposals == null) {
            logger.error("Getting proposals for {} failed", term);
            continue;
        }
        for (IStrategoTerm proposalTerm : proposals) {
            final IStrategoTuple tuple = (IStrategoTuple) proposalTerm;
            if (tuple.getSubtermCount() != 5 || !(tuple.getSubterm(0) instanceof IStrategoString) || !(tuple.getSubterm(1) instanceof IStrategoString) || !(tuple.getSubterm(2) instanceof IStrategoString) || !(tuple.getSubterm(3) instanceof IStrategoAppl) || !(tuple.getSubterm(4) instanceof IStrategoString)) {
                logger.error("Unexpected proposal term {}, skipping", proposalTerm);
                continue;
            }
            final String name = Tools.asJavaString(tuple.getSubterm(0));
            final String text = Tools.asJavaString(tuple.getSubterm(1));
            final String additionalInfo = Tools.asJavaString(tuple.getSubterm(2));
            final StrategoAppl change = (StrategoAppl) tuple.getSubterm(3);
            final String prefix = Tools.asJavaString(tuple.getSubterm(4));
            if (change.getConstructor().getName().contains("REPLACE_TERM")) {
                final ICompletion completion = createCompletionReplaceTerm(name, text, additionalInfo, change, false, prefix, "");
                if (completion == null) {
                    logger.error("Unexpected proposal term {}, skipping", proposalTerm);
                    continue;
                }
                completions.add(completion);
            }
        }
    }
    for (IStrategoTerm term : rightRecursive) {
        IStrategoTerm sort = termFactory.makeString(ImploderAttachment.getSort(term));
        final IStrategoTerm strategoInput = termFactory.makeTuple(sort, term);
        IStrategoTerm proposals = null;
        try {
            proposals = strategoCommon.invoke(runtime, strategoInput, "get-proposals-right-recursive-" + languageName);
        } catch (Exception e) {
            logger.error("Getting proposals for {} failed", term);
            continue;
        }
        if (proposals == null) {
            logger.error("Getting proposals for {} failed", term);
            continue;
        }
        for (IStrategoTerm proposalTerm : proposals) {
            final IStrategoTuple tuple = (IStrategoTuple) proposalTerm;
            if (tuple.getSubtermCount() != 5 || !(tuple.getSubterm(0) instanceof IStrategoString) || !(tuple.getSubterm(1) instanceof IStrategoString) || !(tuple.getSubterm(2) instanceof IStrategoString) || !(tuple.getSubterm(3) instanceof IStrategoAppl) || !(tuple.getSubterm(4) instanceof IStrategoString)) {
                logger.error("Unexpected proposal term {}, skipping", proposalTerm);
                continue;
            }
            final String name = Tools.asJavaString(tuple.getSubterm(0));
            final String text = Tools.asJavaString(tuple.getSubterm(1));
            final String additionalInfo = Tools.asJavaString(tuple.getSubterm(2));
            final StrategoAppl change = (StrategoAppl) tuple.getSubterm(3);
            final String suffix = Tools.asJavaString(tuple.getSubterm(4));
            if (change.getConstructor().getName().contains("REPLACE_TERM")) {
                final ICompletion completion = createCompletionReplaceTerm(name, text, additionalInfo, change, false, "", suffix);
                if (completion == null) {
                    logger.error("Unexpected proposal term {}, skipping", proposalTerm);
                    continue;
                }
                completions.add(completion);
            }
        }
    }
    return completions;
}