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[#550] Cache AbstractInternalAntlrParser.createAllRules

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Signed-off-by: Christian Dietrich <christian.dietrich@itemis.de>
This commit is contained in:
Christian Dietrich 2018-01-26 10:08:02 +01:00
parent 5292c344c6
commit 26d6870c88
1 changed files with 9 additions and 1 deletions
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10
org.eclipse.xtext/src/org/eclipse/xtext/parser/antlr/AbstractInternalAntlrParser.java
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@ -14,6 +14,7 @@ import java.util.ArrayList;
import java.util.List;
import java.util.Map;
import java.util.Map.Entry;
import java.util.concurrent.ConcurrentHashMap;
import org.antlr.runtime.BitSet;
import org.antlr.runtime.CommonToken;
@ -201,6 +202,8 @@ public abstract class AbstractInternalAntlrParser extends Parser {
private static final Logger logger = Logger.getLogger(AbstractInternalAntlrParser.class);
private static final ConcurrentHashMap<Grammar, Map<String, AbstractRule>> allRulesCache = new ConcurrentHashMap<>();
private ICompositeNode currentNode;
private INode lastConsumedNode;
@ -235,13 +238,18 @@ public abstract class AbstractInternalAntlrParser extends Parser {
* @since 2.11
*/
protected Map<String, AbstractRule> createAllRules(Grammar grammar) {
Map<String, AbstractRule> allRules = Maps.newHashMap();
Map<String, AbstractRule> allRules = allRulesCache.get(grammar);
if (allRules != null) {
return allRules;
}
allRules = Maps.newHashMap();
for (AbstractRule rule: GrammarUtil.allRules(grammar)) {
if(rule instanceof TerminalRule)
allRules.put(rule.getName().toUpperCase(), rule);
else
allRules.put(rule.getName(), rule);
}
allRulesCache.putIfAbsent(grammar, allRules);
return allRules;
}