mirror of
https://github.com/sigmasternchen/xtext-core
synced 2025-03-15 08:18:55 +00:00
clean up of findGuardForGroup in HoistingProcessor
removed special case for non-trivial cardinality - use regular findGuardForElement instead adjusted test cases to follow antlr semantic - ignore following predicates made HoistingProcessor Singleton preparation for better caching
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overflowerror
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commit
dc950e4bef
2 changed files with 33 additions and 98 deletions
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@ -288,7 +288,7 @@ public class HoistingProcessorTest extends AbstractXtextTests {
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HoistingGuard guard = hoistingProcessor.findHoistingGuard(rule.getAlternatives());
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assertFalse(guard.isTrivial());
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assertTrue(guard.hasTerminal());
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assertEquals("((" + getSyntaxForKeywordToken("s", 1) + " || (p1)) && (" + getSyntaxForKeywordToken("a", 1) + " || (p0)))", guard.render());
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assertEquals("(" + getSyntaxForKeywordToken("a", 1) + " || (p0))", guard.render());
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}
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@Test
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@ -344,7 +344,7 @@ public class HoistingProcessorTest extends AbstractXtextTests {
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HoistingGuard guard = hoistingProcessor.findHoistingGuard(rule.getAlternatives());
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assertFalse(guard.isTrivial());
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assertTrue(guard.hasTerminal());
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assertEquals("((" + getSyntaxForKeywordToken("s", 1) + " || (p1)) && (" + getSyntaxForKeywordToken("a", 1) + " || (p0)))", guard.render());
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assertEquals("(" + getSyntaxForKeywordToken("a", 1) + " || (p0))", guard.render());
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}
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@Test
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@ -443,6 +443,7 @@ public class HoistingProcessorTest extends AbstractXtextTests {
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// @formatter:off
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String model =
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MODEL_PREAMBLE +
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"hoistingDebug\n" +
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"S: ($$ p0 $$?=> 'a')? & ($$ p1 $$?=> 'b');";
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// @formatter:off
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XtextResource resource = getResourceFromString(model);
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@ -63,12 +63,14 @@ import org.eclipse.xtext.xtext.generator.parser.antlr.hoisting.token.Token;
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import static org.eclipse.xtext.xtext.generator.parser.antlr.hoisting.utils.DebugUtils.*;
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import org.eclipse.xtext.xtext.generator.parser.antlr.hoisting.utils.StreamUtils;
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import com.google.inject.Singleton;
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/**
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* @author overflow - Initial contribution and API
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*/
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@Singleton
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public class HoistingProcessor {
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private Map<String, HoistingGuard> ruleCache = new HashMap<>();
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private Map<Group, HoistingGuard> groupCache = new HashMap<>();
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private Map<String, HoistingGuard> elementCache = new HashMap<>();
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private Logger log = Logger.getLogger(this.getClass());
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@ -115,7 +117,7 @@ public class HoistingProcessor {
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)
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);
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} catch(TokenAnalysisAbortedException e) {
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throw new TokenAnalysisAbortedException(e.getMessage(), e, currentRule);
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throw new TokenAnalysisAbortedException(e, currentRule);
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}
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}
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@ -343,87 +345,19 @@ public class HoistingProcessor {
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}
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private HoistingGuard findGuardForGroup(Group group, AbstractRule currentRule) {
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log.info("find guard for group");
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GroupGuard groupGuard = new GroupGuard();
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Iterator<AbstractElement> iterator = group.getElements().iterator();
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while (iterator.hasNext()) {
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AbstractElement element = iterator.next();
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for(AbstractElement element : group.getElements()) {
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HoistingGuard guard = findGuardForElement(element, currentRule);
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groupGuard.add(guard);
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String cardinality = element.getCardinality();
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if (isTrivialCardinality(element) || isOneOrMoreCardinality(element)) {
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HoistingGuard guard = findGuardForElementWithTrivialCardinality(element, currentRule);
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groupGuard.add(guard);
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// if cardinality is + and there is a terminal we don't need to consider
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// the following elements
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// if cardinality is + and there is no token the guard won't change even if the
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// element could be repeated
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if (guard.hasTerminal()) {
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groupGuard.setHasTerminal();
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break;
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}
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} else if (isOptionalCardinality(element)) {
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// though not technically necessary, rewrite tree to context checks are not needed
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// rewrite cardinality to alternatives
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// A? B -> A B | B
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// A* B -> A+ B | B -> A B | B (see above)
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// make copy of every element because we can't use any element twice
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List<AbstractElement> remainingElementsInGroup = StreamUtils.fromIterator(iterator)
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.collect(Collectors.toList());
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if (remainingElementsInGroup.isEmpty()) {
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// B is empty
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// context will be taken from parent element
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HoistingGuard guard = findGuardForOptionalCardinalityWithoutContext(element, currentRule);
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groupGuard.add(guard);
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if (guard.hasTerminal()) {
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groupGuard.setHasTerminal();
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}
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// there are no following elements
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break;
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} else {
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// B is non-empty
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// -> construct context for alternatives
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// we need a clone of the element because we need to set the cardinality without changing the
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// original syntax tree
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AbstractElement clonedElement = copy(element);
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clonedElement.setCardinality(null);
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// make copy of first branch and add the cloned element
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List<AbstractElement> remainingElementsInGroupIncludingCurrent = new LinkedList<>(remainingElementsInGroup);
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remainingElementsInGroupIncludingCurrent.add(0, clonedElement);
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Group virtualPathRemaining = XtextFactory.eINSTANCE.createGroup();
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setElementsOfCompoundElement(virtualPathRemaining, remainingElementsInGroup);
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Group virtualPathRemainingPlusCurrent = XtextFactory.eINSTANCE.createGroup();
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setElementsOfCompoundElement(virtualPathRemainingPlusCurrent, remainingElementsInGroupIncludingCurrent);
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Alternatives virtualAlternatives = XtextFactory.eINSTANCE.createAlternatives();
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setElementsOfCompoundElement(virtualAlternatives, Arrays.asList(virtualPathRemaining, virtualPathRemainingPlusCurrent));
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// get Guard for virtual alternatives
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HoistingGuard guard = findGuardForElementWithTrivialCardinality(virtualAlternatives, currentRule);
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groupGuard.add(guard);
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if (guard.hasTerminal()) {
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groupGuard.setHasTerminal();
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}
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// following elements are included in alternative, no need to check further
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break;
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}
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} else {
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throw new IllegalArgumentException("unknown cardinality: " + cardinality);
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// if cardinality is + and there is a terminal we don't need to consider
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// the following elements
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// if cardinality is + and there is no token the guard won't change even if the
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// element could be repeated
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if (guard.hasTerminal()) {
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groupGuard.setHasTerminal();
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break;
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}
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}
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@ -433,13 +367,7 @@ public class HoistingProcessor {
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// TODO: make private
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public HoistingGuard findGuardForRule(AbstractRule rule) {
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log.info("finding guard for rule: " + rule.getName());
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HoistingGuard guard = ruleCache.get(rule.getName());
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if (guard == null) {
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log.info("not in cache");
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guard = findGuardForElement(rule.getAlternatives(), rule);
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ruleCache.put(rule.getName(), guard);
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}
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return guard;
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return findGuardForElement(rule.getAlternatives(), rule);
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}
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private boolean pathHasTokenOrAction(AbstractElement path) {
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@ -520,15 +448,26 @@ public class HoistingProcessor {
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}
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private HoistingGuard findGuardForElement(AbstractElement element, AbstractRule currentRule) {
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String path = getPathOfElement(element);
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HoistingGuard guard = null;//elementCache.get(path);
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if (guard != null) {
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log.info("from cache: " + path);
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return guard;
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}
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if (isTrivialCardinality(element) ||
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isOneOrMoreCardinality(element)
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) {
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return findGuardForElementWithTrivialCardinality(element, currentRule);
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guard = findGuardForElementWithTrivialCardinality(element, currentRule);
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} else if (isOptionalCardinality(element)) {
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return findGuardForOptionalCardinalityWithoutContext(element, currentRule);
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guard = findGuardForOptionalCardinalityWithoutContext(element, currentRule);
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} else {
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throw new IllegalArgumentException("unknown cardinality: " + element.getCardinality());
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}
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elementCache.put(path, guard);
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return guard;
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}
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private HoistingGuard findGuardForElementWithTrivialCardinality(AbstractElement element, AbstractRule currentRule) {
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@ -538,12 +477,7 @@ public class HoistingProcessor {
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if (element instanceof Alternatives) {
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return findGuardForAlternatives((Alternatives) element, currentRule);
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} else if (element instanceof Group) {
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HoistingGuard guard = groupCache.get(element);
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if (guard == null) {
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guard = findGuardForGroup((Group) element, currentRule);
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groupCache.put((Group) element, guard);
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}
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return guard;
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return findGuardForGroup((Group) element, currentRule);
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} else if (element instanceof AbstractSemanticPredicate) {
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return new PredicateGuard((AbstractSemanticPredicate) element);
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} else if (Token.isToken(element)) {
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