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basic support for simple prefix paths

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overflowerror 2021-12-08 18:45:54 +01:00
parent 621f37874f
commit 372d0a4a01
9 changed files with 354 additions and 151 deletions
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54
org.eclipse.xtext.tests/src/org/eclipse/xtext/xtext/generator/hoisting/HoistingProcessorTest.java
View file

@ -71,6 +71,9 @@ public class HoistingProcessorTest extends AbstractXtextTests {
private String getSyntaxForTerminalToken(String terminal, int offset) {
return "input.LA(" + offset + ") != " + terminal;
}
private String getSyntaxForEofToken(int offset) {
return "input.LA(" + offset + ") != EOF";
}
@Test
public void testEmptyRule() throws Exception {
@ -81,6 +84,7 @@ public class HoistingProcessorTest extends AbstractXtextTests {
// @formatter:off
XtextResource resource = getResourceFromString(model);
Grammar grammar = ((Grammar) resource.getContents().get(0));
hoistingProcessor.init(grammar);
AbstractRule rule = getRule(grammar, "S");
HoistingGuard guard = hoistingProcessor.findHoistingGuard(rule.getAlternatives());
@ -97,6 +101,7 @@ public class HoistingProcessorTest extends AbstractXtextTests {
// @formatter:off
XtextResource resource = getResourceFromString(model);
Grammar grammar = ((Grammar) resource.getContents().get(0));
hoistingProcessor.init(grammar);
AbstractRule rule = getRule(grammar, "S");
HoistingGuard guard = hoistingProcessor.findHoistingGuard(rule.getAlternatives());
@ -114,6 +119,7 @@ public class HoistingProcessorTest extends AbstractXtextTests {
// @formatter:off
XtextResource resource = getResourceFromString(model);
Grammar grammar = ((Grammar) resource.getContents().get(0));
hoistingProcessor.init(grammar);
AbstractRule rule = getRule(grammar, "S");
HoistingGuard guard = hoistingProcessor.findHoistingGuard(rule.getAlternatives());
@ -131,6 +137,7 @@ public class HoistingProcessorTest extends AbstractXtextTests {
// @formatter:off
XtextResource resource = getResourceFromString(model);
Grammar grammar = ((Grammar) resource.getContents().get(0));
hoistingProcessor.init(grammar);
AbstractRule rule = getRule(grammar, "S");
HoistingGuard guard = hoistingProcessor.findHoistingGuard(rule.getAlternatives());
@ -148,6 +155,7 @@ public class HoistingProcessorTest extends AbstractXtextTests {
// @formatter:off
XtextResource resource = getResourceFromString(model);
Grammar grammar = ((Grammar) resource.getContents().get(0));
hoistingProcessor.init(grammar);
AbstractRule rule = getRule(grammar, "S");
HoistingGuard guard = hoistingProcessor.findHoistingGuard(rule.getAlternatives());
@ -165,6 +173,7 @@ public class HoistingProcessorTest extends AbstractXtextTests {
// @formatter:off
XtextResource resource = getResourceFromString(model);
Grammar grammar = ((Grammar) resource.getContents().get(0));
hoistingProcessor.init(grammar);
AbstractRule rule = getRule(grammar, "S");
HoistingGuard guard = hoistingProcessor.findHoistingGuard(rule.getAlternatives());
@ -182,6 +191,7 @@ public class HoistingProcessorTest extends AbstractXtextTests {
// @formatter:off
XtextResource resource = getResourceFromString(model);
Grammar grammar = ((Grammar) resource.getContents().get(0));
hoistingProcessor.init(grammar);
AbstractRule rule = getRule(grammar, "S");
HoistingGuard guard = hoistingProcessor.findHoistingGuard(rule.getAlternatives());
@ -200,6 +210,7 @@ public class HoistingProcessorTest extends AbstractXtextTests {
// @formatter:off
XtextResource resource = getResourceFromString(model);
Grammar grammar = ((Grammar) resource.getContents().get(0));
hoistingProcessor.init(grammar);
AbstractRule rule = getRule(grammar, "S");
HoistingGuard guard = hoistingProcessor.findHoistingGuard(rule.getAlternatives());
@ -218,6 +229,7 @@ public class HoistingProcessorTest extends AbstractXtextTests {
// @formatter:off
XtextResource resource = getResourceFromString(model);
Grammar grammar = ((Grammar) resource.getContents().get(0));
hoistingProcessor.init(grammar);
AbstractRule rule = getRule(grammar, "S");
HoistingGuard guard = hoistingProcessor.findHoistingGuard(rule.getAlternatives());
@ -234,6 +246,7 @@ public class HoistingProcessorTest extends AbstractXtextTests {
// @formatter:off
XtextResource resource = getResourceFromString(model);
Grammar grammar = ((Grammar) resource.getContents().get(0));
hoistingProcessor.init(grammar);
AbstractRule rule = getRule(grammar, "S");
HoistingGuard guard = hoistingProcessor.findHoistingGuard(rule.getAlternatives());
@ -251,6 +264,7 @@ public class HoistingProcessorTest extends AbstractXtextTests {
// @formatter:off
XtextResource resource = getResourceFromString(model);
Grammar grammar = ((Grammar) resource.getContents().get(0));
hoistingProcessor.init(grammar);
AbstractRule rule = getRule(grammar, "S");
HoistingGuard guard = hoistingProcessor.findHoistingGuard(rule.getAlternatives());
@ -268,6 +282,7 @@ public class HoistingProcessorTest extends AbstractXtextTests {
// @formatter:off
XtextResource resource = getResourceFromString(model);
Grammar grammar = ((Grammar) resource.getContents().get(0));
hoistingProcessor.init(grammar);
AbstractRule rule = getRule(grammar, "S");
HoistingGuard guard = hoistingProcessor.findHoistingGuard(rule.getAlternatives());
@ -285,6 +300,7 @@ public class HoistingProcessorTest extends AbstractXtextTests {
// @formatter:off
XtextResource resource = getResourceFromString(model);
Grammar grammar = ((Grammar) resource.getContents().get(0));
hoistingProcessor.init(grammar);
AbstractRule rule = getRule(grammar, "S");
hoistingProcessor.findHoistingGuard(rule.getAlternatives());
@ -299,6 +315,7 @@ public class HoistingProcessorTest extends AbstractXtextTests {
// @formatter:off
XtextResource resource = getResourceFromString(model);
Grammar grammar = ((Grammar) resource.getContents().get(0));
hoistingProcessor.init(grammar);
AbstractRule rule = getRule(grammar, "S");
HoistingGuard guard = hoistingProcessor.findHoistingGuard(rule.getAlternatives());
@ -316,6 +333,7 @@ public class HoistingProcessorTest extends AbstractXtextTests {
// @formatter:off
XtextResource resource = getResourceFromString(model);
Grammar grammar = ((Grammar) resource.getContents().get(0));
hoistingProcessor.init(grammar);
AbstractRule rule = getRule(grammar, "S");
HoistingGuard guard = hoistingProcessor.findHoistingGuard(rule.getAlternatives());
@ -332,6 +350,7 @@ public class HoistingProcessorTest extends AbstractXtextTests {
// @formatter:off
XtextResource resource = getResourceFromString(model);
Grammar grammar = ((Grammar) resource.getContents().get(0));
hoistingProcessor.init(grammar);
AbstractRule rule = getRule(grammar, "S");
hoistingProcessor.findHoistingGuard(rule.getAlternatives());
@ -347,6 +366,7 @@ public class HoistingProcessorTest extends AbstractXtextTests {
// @formatter:off
XtextResource resource = getResourceFromString(model);
Grammar grammar = ((Grammar) resource.getContents().get(0));
hoistingProcessor.init(grammar);
AbstractRule rule = getRule(grammar, "S");
HoistingGuard guard = hoistingProcessor.findHoistingGuard(rule.getAlternatives());
@ -364,6 +384,7 @@ public class HoistingProcessorTest extends AbstractXtextTests {
// @formatter:off
XtextResource resource = getResourceFromString(model);
Grammar grammar = ((Grammar) resource.getContents().get(0));
hoistingProcessor.init(grammar);
AbstractRule rule = getRule(grammar, "S");
HoistingGuard guard = hoistingProcessor.findHoistingGuard(rule.getAlternatives());
@ -380,6 +401,7 @@ public class HoistingProcessorTest extends AbstractXtextTests {
// @formatter:off
XtextResource resource = getResourceFromString(model);
Grammar grammar = ((Grammar) resource.getContents().get(0));
hoistingProcessor.init(grammar);
AbstractRule rule = getRule(grammar, "S");
HoistingGuard guard = hoistingProcessor.findHoistingGuard(rule.getAlternatives());
@ -397,6 +419,7 @@ public class HoistingProcessorTest extends AbstractXtextTests {
// @formatter:off
XtextResource resource = getResourceFromString(model);
Grammar grammar = ((Grammar) resource.getContents().get(0));
hoistingProcessor.init(grammar);
AbstractRule rule = getRule(grammar, "S");
hoistingProcessor.findHoistingGuard(rule.getAlternatives());
@ -411,6 +434,7 @@ public class HoistingProcessorTest extends AbstractXtextTests {
// @formatter:off
XtextResource resource = getResourceFromString(model);
Grammar grammar = ((Grammar) resource.getContents().get(0));
hoistingProcessor.init(grammar);
AbstractRule rule = getRule(grammar, "S");
HoistingGuard guard = hoistingProcessor.findHoistingGuard(rule.getAlternatives());
@ -428,6 +452,7 @@ public class HoistingProcessorTest extends AbstractXtextTests {
// @formatter:off
XtextResource resource = getResourceFromString(model);
Grammar grammar = ((Grammar) resource.getContents().get(0));
hoistingProcessor.init(grammar);
AbstractRule rule = getRule(grammar, "S");
hoistingProcessor.findHoistingGuard(rule.getAlternatives());
@ -442,6 +467,7 @@ public class HoistingProcessorTest extends AbstractXtextTests {
// @formatter:off
XtextResource resource = getResourceFromString(model);
Grammar grammar = ((Grammar) resource.getContents().get(0));
hoistingProcessor.init(grammar);
AbstractRule rule = getRule(grammar, "S");
HoistingGuard guard = hoistingProcessor.findHoistingGuard(rule.getAlternatives());
@ -470,6 +496,7 @@ public class HoistingProcessorTest extends AbstractXtextTests {
// @formatter:off
XtextResource resource = getResourceFromString(model);
Grammar grammar = ((Grammar) resource.getContents().get(0));
hoistingProcessor.init(grammar);
AbstractRule rule = getRule(grammar, "S");
HoistingGuard guard = hoistingProcessor.findHoistingGuard(rule.getAlternatives());
@ -488,6 +515,7 @@ public class HoistingProcessorTest extends AbstractXtextTests {
// @formatter:off
XtextResource resource = getResourceFromString(model);
Grammar grammar = ((Grammar) resource.getContents().get(0));
hoistingProcessor.init(grammar);
AbstractRule rule = getRule(grammar, "S");
HoistingGuard guard = hoistingProcessor.findHoistingGuard(rule.getAlternatives());
@ -508,6 +536,7 @@ public class HoistingProcessorTest extends AbstractXtextTests {
// @formatter:off
XtextResource resource = getResourceFromString(model);
Grammar grammar = ((Grammar) resource.getContents().get(0));
hoistingProcessor.init(grammar);
AbstractRule rule = getRule(grammar, "S");
HoistingGuard guard = hoistingProcessor.findHoistingGuard(rule.getAlternatives());
@ -527,6 +556,7 @@ public class HoistingProcessorTest extends AbstractXtextTests {
// @formatter:off
XtextResource resource = getResourceFromString(model);
Grammar grammar = ((Grammar) resource.getContents().get(0));
hoistingProcessor.init(grammar);
AbstractRule rule = getRule(grammar, "S");
HoistingGuard guard = hoistingProcessor.findHoistingGuard(rule.getAlternatives());
@ -547,6 +577,7 @@ public class HoistingProcessorTest extends AbstractXtextTests {
// @formatter:off
XtextResource resource = getResourceFromString(model);
Grammar grammar = ((Grammar) resource.getContents().get(0));
hoistingProcessor.init(grammar);
AbstractRule rule = getRule(grammar, "S");
HoistingGuard guard = hoistingProcessor.findHoistingGuard(rule.getAlternatives());
@ -567,6 +598,7 @@ public class HoistingProcessorTest extends AbstractXtextTests {
// @formatter:off
XtextResource resource = getResourceFromString(model);
Grammar grammar = ((Grammar) resource.getContents().get(0));
hoistingProcessor.init(grammar);
AbstractRule rule = getRule(grammar, "S");
HoistingGuard guard = hoistingProcessor.findHoistingGuard(rule.getAlternatives());
@ -589,6 +621,7 @@ public class HoistingProcessorTest extends AbstractXtextTests {
// @formatter:off
XtextResource resource = getResourceFromString(model);
Grammar grammar = ((Grammar) resource.getContents().get(0));
hoistingProcessor.init(grammar);
AbstractRule rule = getRule(grammar, "S");
HoistingGuard guard = hoistingProcessor.findHoistingGuard(rule.getAlternatives());
@ -606,6 +639,7 @@ public class HoistingProcessorTest extends AbstractXtextTests {
// @formatter:off
XtextResource resource = getResourceFromString(model);
Grammar grammar = ((Grammar) resource.getContents().get(0));
hoistingProcessor.init(grammar);
AbstractRule rule = getRule(grammar, "S");
HoistingGuard guard = hoistingProcessor.findHoistingGuard(rule.getAlternatives());
@ -624,6 +658,7 @@ public class HoistingProcessorTest extends AbstractXtextTests {
// @formatter:off
XtextResource resource = getResourceFromString(model);
Grammar grammar = ((Grammar) resource.getContents().get(0));
hoistingProcessor.init(grammar);
AbstractRule rule = getRule(grammar, "S");
HoistingGuard guard = hoistingProcessor.findHoistingGuard(rule.getAlternatives());
@ -647,6 +682,7 @@ public class HoistingProcessorTest extends AbstractXtextTests {
// @formatter:off
XtextResource resource = getResourceFromString(model);
Grammar grammar = ((Grammar) resource.getContents().get(0));
hoistingProcessor.init(grammar);
AbstractRule rule = getRule(grammar, "S");
HoistingGuard guard = hoistingProcessor.findHoistingGuard(rule.getAlternatives());
@ -670,6 +706,7 @@ public class HoistingProcessorTest extends AbstractXtextTests {
// @formatter:off
XtextResource resource = getResourceFromString(model);
Grammar grammar = ((Grammar) resource.getContents().get(0));
hoistingProcessor.init(grammar);
AbstractRule rule = getRule(grammar, "S");
HoistingGuard guard = hoistingProcessor.findHoistingGuard(rule.getAlternatives());
@ -692,6 +729,7 @@ public class HoistingProcessorTest extends AbstractXtextTests {
// @formatter:off
XtextResource resource = getResourceFromString(model);
Grammar grammar = ((Grammar) resource.getContents().get(0));
hoistingProcessor.init(grammar);
AbstractRule rule = getRule(grammar, "S");
HoistingGuard guard = hoistingProcessor.findHoistingGuard(rule.getAlternatives());
@ -701,8 +739,7 @@ public class HoistingProcessorTest extends AbstractXtextTests {
assertEquals("((" + getSyntaxForKeywordToken("b", 3) + " || ((p0) && (p2))) && (" + getSyntaxForKeywordToken("c", 3) + " || ((p0) && (p3))) && (" + getSyntaxForKeywordToken("d", 3) + " || (p1)))", guard.render());
}
@Test(expected = TokenAnalysisAbortedException.class)
public void testAlternativeEmptyAndNonEmptyPaths_expectTokenAnalysisAbortedException() throws Exception {
public void testAlternativeEmptyAndNonEmptyPaths_expectEofCheck() throws Exception {
// @formatter:off
String model =
MODEL_PREAMBLE +
@ -711,13 +748,14 @@ public class HoistingProcessorTest extends AbstractXtextTests {
// @formatter:off
XtextResource resource = getResourceFromString(model);
Grammar grammar = ((Grammar) resource.getContents().get(0));
hoistingProcessor.init(grammar);
AbstractRule rule = getRule(grammar, "S");
hoistingProcessor.findHoistingGuard(rule.getAlternatives());
HoistingGuard guard = hoistingProcessor.findHoistingGuard(rule.getAlternatives());
assertEquals("((" + getSyntaxForKeywordToken("a", 1) + " || (p0)) && (" + getSyntaxForEofToken(1) + " || (p1)))", guard.render());
}
@Test(expected = TokenAnalysisAbortedException.class)
public void testAlternativeWithPrefixPath_expectTokenAnalysisAbortedException() throws Exception {
public void testAlternativeWithPrefixPath_expectEofCheck() throws Exception {
// @formatter:off
String model =
MODEL_PREAMBLE +
@ -726,9 +764,11 @@ public class HoistingProcessorTest extends AbstractXtextTests {
// @formatter:off
XtextResource resource = getResourceFromString(model);
Grammar grammar = ((Grammar) resource.getContents().get(0));
hoistingProcessor.init(grammar);
AbstractRule rule = getRule(grammar, "S");
hoistingProcessor.findHoistingGuard(rule.getAlternatives());
HoistingGuard guard = hoistingProcessor.findHoistingGuard(rule.getAlternatives());
assertEquals("((" + getSyntaxForEofToken(3) + " || (p0)) && (" + getSyntaxForKeywordToken("c", 3) + " || (p1)))", guard.render());
}
@Test(expected = TokenAnalysisAbortedException.class)
@ -742,6 +782,7 @@ public class HoistingProcessorTest extends AbstractXtextTests {
// @formatter:off
XtextResource resource = getResourceFromString(model);
Grammar grammar = ((Grammar) resource.getContents().get(0));
hoistingProcessor.init(grammar);
AbstractRule rule = getRule(grammar, "S");
hoistingProcessor.findHoistingGuard(rule.getAlternatives());
@ -759,6 +800,7 @@ public class HoistingProcessorTest extends AbstractXtextTests {
// @formatter:off
XtextResource resource = getResourceFromString(model);
Grammar grammar = ((Grammar) resource.getContents().get(0));
hoistingProcessor.init(grammar);
AbstractRule rule = getRule(grammar, "S");
HoistingGuard guard = hoistingProcessor.findHoistingGuard(rule.getAlternatives());

2
org.eclipse.xtext.xtext.generator/src/org/eclipse/xtext/xtext/generator/parser/antlr/AbstractAntlrGrammarGenerator.xtend
View file

@ -73,6 +73,8 @@ abstract class AbstractAntlrGrammarGenerator {
if (!isCombinedGrammar) {
fsa.generateFile(grammarNaming.getLexerGrammar(it).grammarFileName, flattened.compileLexer(options))
}
init
}
protected def isCombinedGrammar() {

5
org.eclipse.xtext.xtext.generator/src/org/eclipse/xtext/xtext/generator/parser/antlr/hoisting/HoistingProcessor.java
View file

@ -25,6 +25,7 @@ import org.eclipse.xtext.Action;
import org.eclipse.xtext.Alternatives;
import org.eclipse.xtext.Assignment;
import org.eclipse.xtext.CompoundElement;
import org.eclipse.xtext.Grammar;
import org.eclipse.xtext.GrammarUtil;
import org.eclipse.xtext.Group;
import org.eclipse.xtext.JavaAction;
@ -65,8 +66,8 @@ public class HoistingProcessor {
private HoistingConfiguration config = new HoistingConfiguration();
private TokenAnalysis analysis;
public HoistingProcessor() {
analysis = new TokenAnalysis(config);
public void init(Grammar grammar) {
analysis = new TokenAnalysis(config, grammar);
}
// TODO: handling for TokenAnalysisAbortedException

328
org.eclipse.xtext.xtext.generator/src/org/eclipse/xtext/xtext/generator/parser/antlr/hoisting/pathAnalysis/TokenAnalysis.java
View file

@ -11,6 +11,7 @@ package org.eclipse.xtext.xtext.generator.parser.antlr.hoisting.pathAnalysis;
import static org.eclipse.xtext.xtext.generator.parser.antlr.hoisting.utils.DebugUtils.*;
import java.util.ArrayList;
import java.util.Arrays;
import java.util.HashSet;
import java.util.List;
import java.util.Objects;
@ -20,211 +21,270 @@ import java.util.stream.Collectors;
import java.util.stream.IntStream;
import org.apache.log4j.Logger;
import org.eclipse.emf.ecore.EObject;
import org.eclipse.xtext.AbstractElement;
import org.eclipse.xtext.AbstractSemanticPredicate;
import org.eclipse.xtext.Action;
import org.eclipse.xtext.AbstractRule;
import org.eclipse.xtext.Alternatives;
import org.eclipse.xtext.Assignment;
import org.eclipse.xtext.CompoundElement;
import org.eclipse.xtext.Grammar;
import org.eclipse.xtext.GrammarUtil;
import org.eclipse.xtext.Group;
import org.eclipse.xtext.JavaAction;
import org.eclipse.xtext.RuleCall;
import org.eclipse.xtext.UnorderedGroup;
import org.eclipse.xtext.util.XtextSwitch;
import org.eclipse.xtext.xtext.generator.parser.antlr.hoisting.HoistingConfiguration;
import org.eclipse.xtext.xtext.generator.parser.antlr.hoisting.exceptions.SymbolicAnalysisFailedException;
import org.eclipse.xtext.xtext.generator.parser.antlr.hoisting.exceptions.TokenAnalysisAbortedException;
import org.eclipse.xtext.xtext.generator.parser.antlr.hoisting.exceptions.UnsupportedConstructException;
import org.eclipse.xtext.xtext.generator.parser.antlr.hoisting.token.Token;
import org.eclipse.xtext.xtext.generator.parser.antlr.hoisting.utils.MutablePrimitiveWrapper;
import static org.eclipse.xtext.GrammarUtil.*;
import static org.eclipse.xtext.EcoreUtil2.*;
/**
* @author overflow - Initial contribution and API
*/
public class TokenAnalysis {
private HoistingConfiguration config;
private Grammar grammar;
private Logger log = Logger.getLogger(TokenAnalysis.class);
public TokenAnalysis(HoistingConfiguration config) {
public TokenAnalysis(HoistingConfiguration config, Grammar grammar) {
this.config = config;
this.grammar = grammar;
}
private TokenAnalysisPaths getTokenForIndexesAlternatives(CompoundElement path, TokenAnalysisPaths prefix, boolean needsLength) throws TokenAnalysisAbortedException {
if (prefix.isDone()) {
return prefix;
}
TokenAnalysisPaths result;
if (isOptionalCardinality(path)) {
result = prefix;
if (needsLength) {
// analysis is not done but there are no more mandatory tokens
throw new TokenAnalysisAbortedException("needed path length not satisfied due to optional cardinality");
}
} else {
result = TokenAnalysisPaths.empty(prefix);
}
boolean loop = isMultipleCardinality(path);
do {
boolean allDone = true;
for (AbstractElement element : path.getElements()) {
TokenAnalysisPaths current = new TokenAnalysisPaths(prefix);
current = getTokenForIndexes(element, current, needsLength); // will check for needsLength
if (!current.isDone()) {
allDone = false;
private CompoundElement getCompoundContainer(AbstractElement element) {
if (element instanceof CompoundElement) {
// get container of compoundElement since getContainerOfType
// would return the same element
EObject tmp = element.eContainer();
while (!(tmp instanceof AbstractElement)) {
if (tmp == null) {
return null;
}
tmp = tmp.eContainer();
}
element = (AbstractElement) tmp;
}
return getContainerOfType(element, CompoundElement.class);
}
result = result.merge(current);
private List<AbstractElement> getNextElementsInContext(AbstractElement last) {
CompoundElement container = getCompoundContainer(last);
while (container instanceof Alternatives) {
// skip alternatives since they have to be covered separately
last = container;
container = getCompoundContainer(last);
}
if (container instanceof UnorderedGroup) {
List<AbstractElement> result = new ArrayList<>();
result.addAll(container.getElements());
result.addAll(getNextElementsInContext(container));
return result;
} else if (container instanceof Group) {
List<AbstractElement> elements = container.getElements();
int index = elements.indexOf(last);
log.info(index);
if (index < elements.size() - 1) {
return Arrays.asList(elements.get(index + 1));
} else {
// this is the last element
return getNextElementsInContext(container);
}
} else if (container == null) {
// end of rule
AbstractRule rule = containingRule(last);
List<RuleCall> calls = findAllRuleCalls(grammar, rule);
if (calls.isEmpty()) {
// has to be start rule
// context is EOF
return Arrays.asList((AbstractElement) null);
}
if (allDone) {
List<AbstractElement> result = new ArrayList<>();
for (RuleCall call : calls) {
result.addAll(getNextElementsInContext(call));
}
return result;
} else {
throw new IllegalArgumentException("unknown compound element: " + container.eClass().getName());
}
}
private TokenAnalysisPaths getTokenPathsContext(AbstractElement last, TokenAnalysisPaths prefix) {
List<AbstractElement> context = getNextElementsInContext(last);
TokenAnalysisPaths result = TokenAnalysisPaths.empty(prefix);
if (context.isEmpty()) {
// TODO: is this special case necessary?
throw new TokenAnalysisAbortedException("context analysis failed: no context");
}
for (AbstractElement element : context) {
TokenAnalysisPaths path = new TokenAnalysisPaths(prefix);
path = getTokenPaths(element, path, false, false);
if (!path.isDone()) {
path = getTokenPathsContext(element, path);
}
if (path.isDone()) {
result = result.merge(path);
} else {
throw new TokenAnalysisAbortedException("context analysis failed");
}
}
return result;
}
private TokenAnalysisPaths getTokenPathsTrivial(Group path, TokenAnalysisPaths prefix) {
TokenAnalysisPaths result = new TokenAnalysisPaths(prefix);
for(AbstractElement element : path.getElements()) {
result = getTokenPaths(element, result, false, false);
if (result.isDone()) {
break;
}
prefix = result;
// repeat until all further extensions of prefix are done
} while(loop);
}
return result;
}
private TokenAnalysisPaths getTokenPathsTrivial(Alternatives path, TokenAnalysisPaths prefix) {
TokenAnalysisPaths result = TokenAnalysisPaths.empty(prefix);
private TokenAnalysisPaths getTokenForIndexesGroup(Group path, TokenAnalysisPaths prefix, boolean needsLength) throws TokenAnalysisAbortedException {
if (prefix.isDone()) {
return prefix;
for(AbstractElement element : path.getElements()) {
result = result.merge(getTokenPaths(element, prefix, false, false));
}
return result;
}
private TokenAnalysisPaths getTokenPathsTrivial(UnorderedGroup path, TokenAnalysisPaths prefix) {
TokenAnalysisPaths result;
TokenAnalysisPaths current = new TokenAnalysisPaths(prefix);
TokenAnalysisPaths current;
if (isOptionalCardinality(path)) {
result = prefix;
if (needsLength) {
// analysis is not done but there are no more mandatory tokens
throw new TokenAnalysisAbortedException("needed path length not satisfied due to optional cardinality");
}
if (path.getElements().stream().allMatch(GrammarUtil::isOptionalCardinality)) {
result = new TokenAnalysisPaths(prefix);
} else {
result = TokenAnalysisPaths.empty(prefix);
}
boolean loop = isMultipleCardinality(path);
do {
current = TokenAnalysisPaths.empty(result);
for (AbstractElement element : path.getElements()) {
current = getTokenForIndexes(element, current, false);
if (current.isDone()) {
// no need to look further
return result.merge(current);
}
}
if (needsLength && !current.isDone()) {
// analysis is not done but there are no more mandatory tokens
throw new TokenAnalysisAbortedException("needed path length not satisfied");
current = current.merge(getTokenPaths(element, result, false, false));
}
result = result.merge(current);
current = new TokenAnalysisPaths(result);
} while(loop);
} while(!current.isDone());
// if cardinality is trivial or ? return result
return result;
}
private TokenAnalysisPaths getTokenForIndexesDefault(AbstractElement path, TokenAnalysisPaths prefix, boolean needsLength) throws TokenAnalysisAbortedException {
private TokenAnalysisPaths getTokenPathsTrivial(AbstractElement path, TokenAnalysisPaths prefix) {
return new XtextSwitch<TokenAnalysisPaths>() {
@Override
public TokenAnalysisPaths caseGroup(Group group) {
return getTokenPathsTrivial(group, prefix);
};
@Override
public TokenAnalysisPaths caseAlternatives(Alternatives alternatives) {
return getTokenPathsTrivial(alternatives, prefix);
};
@Override
public TokenAnalysisPaths caseUnorderedGroup(UnorderedGroup unorderedGroup) {
return getTokenPathsTrivial(unorderedGroup, prefix);
};
@Override
public TokenAnalysisPaths caseAssignment(Assignment assignment) {
return getTokenPaths(assignment.getTerminal(), prefix, false, false);
};
@Override
public TokenAnalysisPaths caseRuleCall(RuleCall call) {
if (isParserRuleCall(call) ||
isEnumRuleCall(call)
) {
return getTokenPaths(call.getRule().getAlternatives(), prefix, false, false);
} else {
// go to default case
return null;
}
};
@Override
public TokenAnalysisPaths defaultCase(EObject object) {
AbstractElement element = (AbstractElement) object;
if (Token.isToken(element)) {
TokenAnalysisPaths result = new TokenAnalysisPaths(prefix);
result.add(element);
return result;
} else {
// Actions, Predicates, JavaActions, ...
return prefix;
}
};
}.doSwitch(path);
}
// analyseContext implies needsLength
private TokenAnalysisPaths getTokenPaths(AbstractElement path, TokenAnalysisPaths prefix, boolean analyseContext, boolean needsLength) {
if (prefix.isDone()) {
return prefix;
}
TokenAnalysisPaths result;
if (path == null) {
// empty path means EOF
result = new TokenAnalysisPaths(prefix);
result.add(path);
return result;
}
if (isOptionalCardinality(path)) {
result = prefix;
if (needsLength) {
throw new TokenAnalysisAbortedException("needed path length not satisfied due to optional cardinality");
if (analyseContext) {
result = getTokenPathsContext(path, prefix);
} else if (needsLength) {
throw new TokenAnalysisAbortedException("token expected but path is optional");
} else {
result = new TokenAnalysisPaths(prefix);
}
} else {
result = TokenAnalysisPaths.empty(prefix);
}
TokenAnalysisPaths current = new TokenAnalysisPaths(prefix);
boolean loop = isMultipleCardinality(path);
do {
if (Token.isToken(path)) {
current.add(path);
} else if (isParserRuleCall(path) ||
isEnumRuleCall(path)) {
// path doesn't need length, because we're going to check that anyway in this function
current = getTokenForIndexes(((RuleCall) path).getRule().getAlternatives(), current, false);
} else if (path instanceof Assignment) {
current = getTokenForIndexes(((Assignment) path).getTerminal(), current, false);
TokenAnalysisPaths tokenPaths = getTokenPathsTrivial(path, result);
result = result.merge(tokenPaths);
if (tokenPaths.isDone()) {
result = result.merge(tokenPaths);
break;
} else if (analyseContext) {
tokenPaths = getTokenPathsContext(path, tokenPaths);
result = result.merge(tokenPaths);
} else if (needsLength) {
throw new TokenAnalysisAbortedException("requested length not satisfyable");
} else {
throw new UnsupportedConstructException("unknown element: " + path.eClass().getName());
result = result.merge(tokenPaths);
}
// add path to result
result = result.merge(current);
// if current path is done return result
// precondition: either !needsLength or result empty
// result is only non-empty if ? cardinality
// but then needsLength can't be true.
if (current.isDone()) {
return result;
}
if (needsLength) {
throw new TokenAnalysisAbortedException("needed path length not satisfied");
}
} while(loop);
} while (loop);
return result;
}
private TokenAnalysisPaths getTokenForIndexes(AbstractElement path, TokenAnalysisPaths prefix, boolean needsLength) throws TokenAnalysisAbortedException {
if (path instanceof Alternatives) {
return getTokenForIndexesAlternatives((Alternatives) path, prefix, needsLength);
} else if (path instanceof Group) {
return getTokenForIndexesGroup((Group) path, prefix, needsLength);
} else if (path instanceof UnorderedGroup) {
// clone unordered group
// set cardinality accordingly
// use code for alternatives
CompoundElement clonedUnorderedGroup = (CompoundElement) cloneAbstractElement(path);
if (isOptionalCardinality(path) ||
((UnorderedGroup) path).getElements().stream().allMatch(GrammarUtil::isOptionalCardinality)
){
clonedUnorderedGroup.setCardinality("*");
} else {
clonedUnorderedGroup.setCardinality("+");
}
// getTokenForIndexesAlternatives only needs a CompoundElement so we can give it
// the modified unordered group
return getTokenForIndexesAlternatives(clonedUnorderedGroup, prefix, needsLength);
} else if (path instanceof Action ||
path instanceof AbstractSemanticPredicate ||
path instanceof JavaAction
) {
return prefix;
} else {
return getTokenForIndexesDefault(path, prefix, needsLength);
}
}
private List<List<Token>> getTokenForIndexes(AbstractElement path, List<Integer> indexes) throws TokenAnalysisAbortedException {
return getTokenForIndexes(path, new TokenAnalysisPaths(indexes), true).getTokenPaths();
private List<List<Token>> getTokenPaths(AbstractElement path, List<Integer> indexes, boolean analyseContext) throws TokenAnalysisAbortedException {
return getTokenPaths(path, new TokenAnalysisPaths(indexes), analyseContext, true).getTokenPaths();
}
private boolean arePathsIdenticalSymbolic(AbstractElement path1, AbstractElement path2) throws SymbolicAnalysisFailedException {
@ -246,13 +306,13 @@ public class TokenAnalysis {
List<Integer> range = range(0, i);
try {
tokenListSet1 = new HashSet<>(getTokenForIndexes(path1, range));
tokenListSet1 = new HashSet<>(getTokenPaths(path1, range, false));
} catch (TokenAnalysisAbortedException e) {
tokenListSet1 = null;
}
try {
tokenListSet2 = new HashSet<>(getTokenForIndexes(path2, range));
tokenListSet2 = new HashSet<>(getTokenPaths(path2, range, false));
} catch (TokenAnalysisAbortedException e) {
tokenListSet2 = null;
}
@ -349,7 +409,7 @@ public class TokenAnalysis {
// will throw TokenAnalysisAborted if any path is too short
List<List<List<Token>>> tokenListsForPaths = paths.stream()
//.peek(p -> log.info("next path: " + p))
.map(p -> getTokenForIndexes(p, indexList))
.map(p -> getTokenPaths(p, indexList, true))
.collect(Collectors.toList());
log.info("token lists: " + tokenListsForPaths);

49
org.eclipse.xtext.xtext.generator/src/org/eclipse/xtext/xtext/generator/parser/antlr/hoisting/token/EofToken.java Normal file
View file

@ -0,0 +1,49 @@
/*******************************************************************************
* Copyright (c) 2021 itemis AG (http://www.itemis.eu) and others.
* This program and the accompanying materials are made available under the
* terms of the Eclipse Public License 2.0 which is available at
* http://www.eclipse.org/legal/epl-2.0.
*
* SPDX-License-Identifier: EPL-2.0
*******************************************************************************/
package org.eclipse.xtext.xtext.generator.parser.antlr.hoisting.token;
/**
* @author overflow - Initial contribution and API
*/
public class EofToken implements Token {
private int position;
public EofToken(int position) {
this.position = position;
}
@Override
public String negatedCondition() {
return "input.LA(" + position + ") != EOF";
}
@Override
public int hashCode() {
final int prime = 31;
int result = 1;
result = prime * result + position;
return result;
}
@Override
public boolean equals(Object obj) {
if (this == obj)
return true;
if (obj == null)
return false;
if (getClass() != obj.getClass())
return false;
EofToken other = (EofToken) obj;
if (position != other.position)
return false;
return true;
}
}

8
org.eclipse.xtext.xtext.generator/src/org/eclipse/xtext/xtext/generator/parser/antlr/hoisting/token/NotATokenException.java
View file

@ -14,4 +14,12 @@ package org.eclipse.xtext.xtext.generator.parser.antlr.hoisting.token;
public class NotATokenException extends RuntimeException {
private static final long serialVersionUID = 643265533068524552L;
public NotATokenException() {
super();
}
public NotATokenException(String msg) {
super(msg);
}
}

10
org.eclipse.xtext.xtext.generator/src/org/eclipse/xtext/xtext/generator/parser/antlr/hoisting/token/Token.java
View file

@ -22,7 +22,9 @@ public interface Token {
String negatedCondition();
static boolean isToken(AbstractElement element) {
if (element instanceof Keyword) {
if (element == null) {
return true;
} else if (element instanceof Keyword) {
return true;
} else if (element instanceof RuleCall) {
return (((RuleCall) element).getRule() instanceof TerminalRule);
@ -34,7 +36,9 @@ public interface Token {
}
static Token fromElement(AbstractElement element, int position) {
if (element instanceof Keyword) {
if (element == null) {
return new EofToken(position);
} else if (element instanceof Keyword) {
return new KeywordToken((Keyword) element, position);
} else if (element instanceof RuleCall) {
AbstractRule rule = ((RuleCall) element).getRule();
@ -45,6 +49,6 @@ public interface Token {
return new KeywordToken(((EnumLiteralDeclaration) element).getLiteral(), position);
}
throw new NotATokenException();
throw new NotATokenException(element.eClass().getName());
}
}

1
org.eclipse.xtext.xtext.generator/xtend-gen/org/eclipse/xtext/xtext/generator/parser/antlr/AbstractAntlrGrammarGenerator.java
View file

@ -98,6 +98,7 @@ public abstract class AbstractAntlrGrammarGenerator {
if (_not) {
fsa.generateFile(this.getGrammarNaming().getLexerGrammar(it).getGrammarFileName(), this.compileLexer(flattened, options));
}
this._hoistingProcessor.init(it);
}
protected boolean isCombinedGrammar() {

36
org.eclipse.xtext/src/org/eclipse/xtext/GrammarUtil.java
View file

@ -41,6 +41,7 @@ import org.eclipse.xtext.nodemodel.util.NodeModelUtils;
import org.eclipse.xtext.util.Pair;
import org.eclipse.xtext.util.Strings;
import org.eclipse.xtext.util.Tuples;
import org.eclipse.xtext.util.XtextSwitch;
import org.eclipse.xtext.xtext.CurrentTypeFinder;
import com.google.common.base.Function;
@ -723,4 +724,39 @@ public class GrammarUtil {
public static void addElementsToCompoundElement(CompoundElement element, Collection<? extends AbstractElement> elements) {
addElementsToCompoundElement(element, elements.stream());
}
private static void findAllRuleCalls(List<RuleCall> calls, AbstractElement element, AbstractRule rule) {
new XtextSwitch<Boolean>(){
@Override
public Boolean caseRuleCall(RuleCall object) {
if (object.getRule() == rule) {
calls.add(object);
}
return true;
};
@Override
public Boolean caseAssignment(Assignment object) {
findAllRuleCalls(calls, object.getTerminal(), rule);
return true;
};
@Override
public Boolean caseCompoundElement(CompoundElement object) {
for (AbstractElement element : object.getElements()) {
findAllRuleCalls(calls, element, rule);
}
return true;
};
}.doSwitch(element);
}
public static List<RuleCall> findAllRuleCalls(Grammar grammar, AbstractRule rule) {
List<AbstractRule> rules = allRules(grammar);
List<RuleCall> calls = new ArrayList<>();
for (AbstractRule r : rules) {
findAllRuleCalls(calls, r.getAlternatives(), rule);
}
return calls;
}
}