/*
* Copyright (c) 2012 Sam Harwell, Tunnel Vision Laboratories LLC
* All rights reserved.
*
* The source code of this document is proprietary work, and is not licensed for
* distribution. For information about licensing, contact Sam Harwell at:
* sam@tunnelvisionlabs.com
*/
package org.antlr.works.editor.st4.experimental;
import java.util.Collection;
import java.util.Collections;
import java.util.EnumSet;
import java.util.List;
import java.util.concurrent.ExecutionException;
import java.util.concurrent.Future;
import org.antlr.netbeans.editor.completion.Anchor;
import org.antlr.netbeans.editor.text.DocumentSnapshot;
import org.antlr.netbeans.parsing.spi.BaseParserData;
import org.antlr.netbeans.parsing.spi.ParseContext;
import org.antlr.netbeans.parsing.spi.ParserData;
import org.antlr.netbeans.parsing.spi.ParserDataDefinition;
import org.antlr.netbeans.parsing.spi.ParserDataOptions;
import org.antlr.netbeans.parsing.spi.ParserResultHandler;
import org.antlr.netbeans.parsing.spi.ParserTask;
import org.antlr.netbeans.parsing.spi.ParserTaskDefinition;
import org.antlr.netbeans.parsing.spi.ParserTaskManager;
import org.antlr.netbeans.parsing.spi.ParserTaskProvider;
import org.antlr.netbeans.parsing.spi.ParserTaskScheduler;
import org.antlr.netbeans.parsing.spi.SingletonParserTaskProvider;
import org.antlr.v4.runtime.BailErrorStrategy;
import org.antlr.v4.runtime.CharStream;
import org.antlr.v4.runtime.CommonTokenStream;
import org.antlr.v4.runtime.DefaultErrorStrategy;
import org.antlr.v4.runtime.Dependents;
import org.antlr.v4.runtime.RecognitionException;
import org.antlr.v4.runtime.RuleDependency;
import org.antlr.v4.runtime.TokenSource;
import org.antlr.v4.runtime.atn.PredictionMode;
import org.antlr.v4.runtime.misc.ParseCancellationException;
import org.antlr.works.editor.antlr4.classification.DocumentSnapshotCharStream;
import org.antlr.works.editor.st4.StringTemplateEditorKit;
import org.antlr.works.editor.st4.TemplateParserDataDefinitions;
import org.antlr.works.editor.st4.experimental.generated.TemplateParser;
import org.netbeans.api.editor.mimelookup.MimeRegistration;
/**
*
* @author Sam Harwell
*/
public final class CurrentTemplateContextParserTask implements ParserTask {
private CurrentTemplateContextParserTask() {
}
@Override
public ParserTaskDefinition getDefinition() {
return Definition.INSTANCE;
}
@Override
@RuleDependency(recognizer=TemplateParser.class, rule=TemplateParser.RULE_group, version=0, dependents=Dependents.SELF)
public void parse(ParserTaskManager taskManager, ParseContext context, DocumentSnapshot snapshot, Collection<? extends ParserDataDefinition<?>> requestedData, ParserResultHandler results)
throws InterruptedException, ExecutionException {
if (context.getPosition() == null) {
return;
}
int caretOffset = context.getPosition().getOffset();
Future<ParserData<List<Anchor>>> result =
taskManager.getData(snapshot, TemplateParserDataDefinitions.DYNAMIC_ANCHOR_POINTS, EnumSet.of(ParserDataOptions.SYNCHRONOUS));
ParserData<List<Anchor>> anchorsData = result.get();
List<Anchor> anchors = anchorsData.getData();
TemplateParser.GroupContext ruleContext = null;
if (anchors != null) {
Anchor enclosing = null;
// int grammarType = -1;
/*
* parse the current template
*/
for (Anchor anchor : anchors) {
// if (anchor instanceof TemplateParserAnchorListener.TemplateTypeAnchor) {
// grammarType = ((TemplateParserAnchorListener.TemplateTypeAnchor)anchor).getGrammarType();
// continue;
// }
if (anchor.getSpan().getStartPosition(snapshot).getOffset() <= caretOffset && anchor.getSpan().getEndPosition(snapshot).getOffset() > caretOffset) {
enclosing = anchor;
} else if (anchor.getSpan().getStartPosition(snapshot).getOffset() > caretOffset) {
break;
}
}
if (enclosing != null) {
CharStream input = new DocumentSnapshotCharStream(snapshot);
input.seek(enclosing.getSpan().getStartPosition(snapshot).getOffset());
TemplateLexer lexer = new TemplateLexer(input);
CommonTokenStream tokens = new TaskTokenStream(lexer);
TemplateParser parser = TemplateParserFactory.DEFAULT.getParser(tokens);
try {
parser.getInterpreter().setPredictionMode(PredictionMode.SLL);
parser.removeErrorListeners();
parser.setBuildParseTree(true);
parser.setErrorHandler(new BailErrorStrategy());
ruleContext = parser.group();
} catch (ParseCancellationException ex) {
if (ex.getCause() instanceof RecognitionException) {
// retry with default error handler
tokens.reset();
parser.getInterpreter().setPredictionMode(PredictionMode.LL);
parser.setInputStream(tokens);
parser.setErrorHandler(new DefaultErrorStrategy());
ruleContext = parser.group();
} else {
throw ex;
}
}
}
}
CurrentTemplateContextData data = new CurrentTemplateContextData(snapshot, ruleContext);
results.addResult(new BaseParserData<>(context, TemplateParserDataDefinitions.CURRENT_TEMPLATE_CONTEXT, snapshot, data));
}
private static class TaskTokenStream extends CommonTokenStream {
public TaskTokenStream(TokenSource tokenSource) {
super(tokenSource);
}
@Override
public int LA(int i) {
// if (cancelled) {
// throw new CancellationException();
// }
return super.LA(i);
}
}
private static final class Definition extends ParserTaskDefinition {
private static final Collection<ParserDataDefinition<?>> INPUTS =
Collections.<ParserDataDefinition<?>>singletonList(TemplateParserDataDefinitions.DYNAMIC_ANCHOR_POINTS);
private static final Collection<ParserDataDefinition<?>> OUTPUTS =
Collections.<ParserDataDefinition<?>>singletonList(TemplateParserDataDefinitions.CURRENT_TEMPLATE_CONTEXT);
public static final Definition INSTANCE = new Definition();
public Definition() {
super("StringTemplate Current Template Context", INPUTS, OUTPUTS, ParserTaskScheduler.CURSOR_SENSITIVE_TASK_SCHEDULER);
}
}
@MimeRegistration(mimeType=StringTemplateEditorKit.TEMPLATE_MIME_TYPE, service=ParserTaskProvider.class)
public static final class Provider extends SingletonParserTaskProvider {
@Override
public ParserTaskDefinition getDefinition() {
return Definition.INSTANCE;
}
@Override
public ParserTask createTaskImpl() {
return new CurrentTemplateContextParserTask();
}
}
}