geforkt von Mirrors/FastAsyncWorldEdit
Expression Goodie Bag (#553)
* Remove async expression eval. Implement timeout inline * Remove static state from expr functions * Remove now-unused TL stack * Rework some expr handles (cherry picked from commit 6bc1d4647cc6892ae4dca9fc0e2d239777903c38)
Dieser Commit ist enthalten in:
Octavia Togami
MattBDev
Ursprung
88a5806b0f
Commit
e8bc0c0e1f
@ -19,9 +19,7 @@
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package com.sk89q.worldedit.internal.expression;
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import com.google.common.collect.SetMultimap;
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import java.lang.invoke.MethodHandle;
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import java.time.Instant;
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import static java.util.Objects.requireNonNull;
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@ -31,21 +29,33 @@ public class ExecutionData {
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* Special execution context for evaluating constant values. As long as no variables are used,
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* it can be considered constant.
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*/
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public static final ExecutionData CONSTANT_EVALUATOR = new ExecutionData(null, null);
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public static final ExecutionData CONSTANT_EVALUATOR = new ExecutionData(null, null, Instant.MAX);
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private final SlotTable slots;
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private final SetMultimap<String, MethodHandle> functions;
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private final Functions functions;
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private final Instant deadline;
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public ExecutionData(SlotTable slots, SetMultimap<String, MethodHandle> functions) {
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public ExecutionData(SlotTable slots, Functions functions, Instant deadline) {
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this.slots = slots;
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this.functions = functions;
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this.deadline = deadline;
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}
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public SlotTable getSlots() {
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return requireNonNull(slots, "Cannot use variables in a constant");
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}
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public SetMultimap<String, MethodHandle> getFunctions() {
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public Functions getFunctions() {
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return requireNonNull(functions, "Cannot use functions in a constant");
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}
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public Instant getDeadline() {
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return deadline;
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}
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public void checkDeadline() {
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if (Instant.now().isAfter(deadline)) {
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throw new ExpressionTimeoutException("Calculations exceeded time limit.");
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}
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}
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}
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@ -19,32 +19,20 @@
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package com.sk89q.worldedit.internal.expression;
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import com.google.common.base.Throwables;
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import com.google.common.collect.ImmutableList;
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import com.google.common.collect.SetMultimap;
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import com.google.common.util.concurrent.ThreadFactoryBuilder;
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import com.sk89q.worldedit.WorldEdit;
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import com.sk89q.worldedit.antlr.ExpressionLexer;
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import com.sk89q.worldedit.antlr.ExpressionParser;
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import com.sk89q.worldedit.internal.expression.invoke.ExpressionCompiler;
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import com.sk89q.worldedit.session.request.Request;
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import org.antlr.v4.runtime.CharStream;
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import org.antlr.v4.runtime.CharStreams;
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import org.antlr.v4.runtime.CommonTokenStream;
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import org.antlr.v4.runtime.misc.ParseCancellationException;
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import org.antlr.v4.runtime.tree.ParseTreeWalker;
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import java.lang.invoke.MethodHandle;
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import java.time.Instant;
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import java.util.List;
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import java.util.Objects;
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import java.util.Stack;
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import java.util.concurrent.CountDownLatch;
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import java.util.concurrent.ExecutionException;
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import java.util.concurrent.ExecutorService;
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import java.util.concurrent.Executors;
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import java.util.concurrent.Future;
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import java.util.concurrent.TimeUnit;
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import java.util.concurrent.TimeoutException;
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/**
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* Compiles and evaluates expressions.
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@ -74,19 +62,10 @@ import java.util.concurrent.TimeoutException;
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*/
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public class Expression {
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private static final ThreadLocal<Stack<Expression>> instance = new ThreadLocal<>();
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private static final ExecutorService evalThread = Executors.newFixedThreadPool(
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Runtime.getRuntime().availableProcessors(),
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new ThreadFactoryBuilder()
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.setDaemon(true)
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.setNameFormat("worldedit-expression-eval-%d")
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.build());
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private final SlotTable slots = new SlotTable();
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private final List<String> providedSlots;
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private final ExpressionParser.AllStatementsContext root;
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private final SetMultimap<String, MethodHandle> functions = Functions.getFunctionMap();
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private ExpressionEnvironment environment;
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private final Functions functions = Functions.create();
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private final CompiledExpression compiledExpression;
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public static Expression compile(String expression, String... variableNames) throws ExpressionException {
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@ -138,52 +117,9 @@ public class Expression {
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slot.setValue(values[i]);
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}
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Instant deadline = Instant.now().plusMillis(timeout);
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// evaluation exceptions are thrown out of this method
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if (timeout < 0) {
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return evaluateRoot();
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}
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return evaluateRootTimed(timeout);
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}
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private double evaluateRootTimed(int timeout) throws EvaluationException {
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CountDownLatch startLatch = new CountDownLatch(1);
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Request request = Request.request();
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Future<Double> result = evalThread.submit(() -> {
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Request local = Request.request();
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local.setSession(request.getSession());
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local.setWorld(request.getWorld());
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local.setEditSession(request.getEditSession());
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try {
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startLatch.countDown();
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return Expression.this.evaluateRoot();
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} finally {
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Request.reset();
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}
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});
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try {
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startLatch.await();
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return result.get(timeout, TimeUnit.MILLISECONDS);
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} catch (InterruptedException e) {
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Thread.currentThread().interrupt();
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throw new RuntimeException(e);
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} catch (TimeoutException e) {
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result.cancel(true);
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throw new ExpressionTimeoutException("Calculations exceeded time limit.");
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} catch (ExecutionException e) {
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Throwable cause = e.getCause();
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Throwables.throwIfInstanceOf(cause, EvaluationException.class);
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Throwables.throwIfUnchecked(cause);
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throw new RuntimeException(cause);
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}
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}
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private Double evaluateRoot() throws EvaluationException {
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pushInstance();
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try {
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return compiledExpression.execute(new ExecutionData(slots, functions));
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} finally {
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popInstance();
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}
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return compiledExpression.execute(new ExecutionData(slots, functions, deadline));
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}
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public void optimize() {
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@ -199,35 +135,12 @@ public class Expression {
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return slots;
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}
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public static Expression getInstance() {
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return instance.get().peek();
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}
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private void pushInstance() {
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Stack<Expression> threadLocalExprStack = instance.get();
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if (threadLocalExprStack == null) {
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instance.set(threadLocalExprStack = new Stack<>());
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}
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threadLocalExprStack.push(this);
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}
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private void popInstance() {
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Stack<Expression> threadLocalExprStack = instance.get();
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threadLocalExprStack.pop();
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if (threadLocalExprStack.isEmpty()) {
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instance.set(null);
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}
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}
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public ExpressionEnvironment getEnvironment() {
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return environment;
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return functions.getEnvironment();
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}
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public void setEnvironment(ExpressionEnvironment environment) {
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this.environment = environment;
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functions.setEnvironment(environment);
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}
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}
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@ -19,7 +19,6 @@
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package com.sk89q.worldedit.internal.expression;
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import com.google.common.collect.SetMultimap;
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import com.sk89q.worldedit.antlr.ExpressionParser;
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import org.antlr.v4.runtime.ParserRuleContext;
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import org.antlr.v4.runtime.Token;
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@ -60,16 +59,10 @@ public class ExpressionHelper {
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check(iterations <= 256, ctx, "Loop exceeded 256 iterations");
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}
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public static void checkTimeout() {
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if (Thread.interrupted()) {
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throw new ExpressionTimeoutException("Calculations exceeded time limit.");
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}
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}
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public static MethodHandle resolveFunction(SetMultimap<String, MethodHandle> functions,
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public static MethodHandle resolveFunction(Functions functions,
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ExpressionParser.FunctionCallContext ctx) {
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String fnName = ctx.name.getText();
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Set<MethodHandle> matchingFns = functions.get(fnName);
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Set<MethodHandle> matchingFns = functions.getMap().get(fnName);
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check(!matchingFns.isEmpty(), ctx, "Unknown function '" + fnName + "'");
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for (MethodHandle function : matchingFns) {
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MethodType type = function.type();
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@ -19,11 +19,9 @@
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package com.sk89q.worldedit.internal.expression;
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import com.google.common.collect.SetMultimap;
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import com.sk89q.worldedit.antlr.ExpressionBaseListener;
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import com.sk89q.worldedit.antlr.ExpressionParser;
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import java.lang.invoke.MethodHandle;
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import java.util.Collection;
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import java.util.HashSet;
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import java.util.Set;
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@ -34,10 +32,10 @@ import static com.sk89q.worldedit.internal.expression.ExpressionHelper.resolveFu
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class ExpressionValidator extends ExpressionBaseListener {
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private final Set<String> variableNames = new HashSet<>();
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private final SetMultimap<String, MethodHandle> functions;
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private final Functions functions;
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ExpressionValidator(Collection<String> variableNames,
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SetMultimap<String, MethodHandle> functions) {
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Functions functions) {
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this.variableNames.addAll(variableNames);
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this.functions = functions;
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}
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@ -44,25 +44,10 @@ import static java.lang.invoke.MethodType.methodType;
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/**
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* Contains all functions that can be used in expressions.
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*/
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final class Functions {
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public final class Functions {
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static SetMultimap<String, MethodHandle> getFunctionMap() {
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SetMultimap<String, MethodHandle> map = HashMultimap.create();
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Functions functions = new Functions();
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MethodHandles.Lookup lookup = MethodHandles.lookup();
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try {
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addMathHandles(map, lookup);
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addStaticFunctionHandles(map, lookup);
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functions.addInstanceFunctionHandles(map, lookup);
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} catch (NoSuchMethodException | IllegalAccessException e) {
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throw new IllegalStateException(e);
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}
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// clean up all the functions
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return ImmutableSetMultimap.copyOf(
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Multimaps.transformValues(map, Functions::clean)
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);
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static Functions create() {
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return new Functions();
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}
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private static final MethodHandle DOUBLE_VALUE;
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@ -149,15 +134,6 @@ final class Functions {
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map.put("ridgedmulti", lookup.findStatic(Functions.class, "ridgedmulti",
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methodType(double.class, double.class, double.class, double.class, double.class,
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double.class, double.class)));
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map.put("query", lookup.findStatic(Functions.class, "query",
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methodType(double.class, double.class, double.class, double.class, LocalSlot.class,
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LocalSlot.class)));
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map.put("queryAbs", lookup.findStatic(Functions.class, "queryAbs",
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methodType(double.class, double.class, double.class, double.class, LocalSlot.class,
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LocalSlot.class)));
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map.put("queryRel", lookup.findStatic(Functions.class, "queryRel",
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methodType(double.class, double.class, double.class, double.class, LocalSlot.class,
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LocalSlot.class)));
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}
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private void addInstanceFunctionHandles(
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@ -174,6 +150,20 @@ final class Functions {
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methodType(double.class, double.class, double.class, double.class, double.class,
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double.class, double.class), Functions.class)
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.bindTo(this));
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// rely on expression field
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map.put("query", lookup.findSpecial(Functions.class, "query",
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methodType(double.class, double.class, double.class, double.class, LocalSlot.class,
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LocalSlot.class), Functions.class)
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.bindTo(this));
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map.put("queryAbs", lookup.findSpecial(Functions.class, "queryAbs",
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methodType(double.class, double.class, double.class, double.class, LocalSlot.class,
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LocalSlot.class), Functions.class)
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.bindTo(this));
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map.put("queryRel", lookup.findSpecial(Functions.class, "queryRel",
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methodType(double.class, double.class, double.class, double.class, LocalSlot.class,
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LocalSlot.class), Functions.class)
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.bindTo(this));
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}
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private static double rotate(Variable x, Variable y, double angle) {
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@ -201,6 +191,35 @@ final class Functions {
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private static final Int2ObjectMap<double[]> globalMegaBuffer = new Int2ObjectOpenHashMap<>();
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private final Int2ObjectMap<double[]> megaBuffer = new Int2ObjectOpenHashMap<>();
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private final SetMultimap<String, MethodHandle> map;
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private ExpressionEnvironment environment;
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private Functions() {
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MethodHandles.Lookup lookup = MethodHandles.lookup();
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SetMultimap<String, MethodHandle> map = HashMultimap.create();
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try {
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addMathHandles(map, lookup);
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addStaticFunctionHandles(map, lookup);
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addInstanceFunctionHandles(map, lookup);
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} catch (NoSuchMethodException | IllegalAccessException e) {
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throw new IllegalStateException(e);
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}
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this.map = ImmutableSetMultimap.copyOf(
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Multimaps.transformValues(map, Functions::clean)
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);
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}
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public SetMultimap<String, MethodHandle> getMap() {
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return map;
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}
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public ExpressionEnvironment getEnvironment() {
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return environment;
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}
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public void setEnvironment(ExpressionEnvironment environment) {
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this.environment = environment;
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}
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private static double[] getSubBuffer(Int2ObjectMap<double[]> megabuf, int key) {
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return megabuf.computeIfAbsent(key, k -> new double[1024]);
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@ -332,9 +351,7 @@ final class Functions {
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return ret;
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}
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private static double query(double x, double y, double z, LocalSlot type, LocalSlot data) {
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final ExpressionEnvironment environment = Expression.getInstance().getEnvironment();
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private double query(double x, double y, double z, LocalSlot type, LocalSlot data) {
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// Read values from world
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final double typeId = environment.getBlockType(x, y, z);
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final double dataValue = environment.getBlockData(x, y, z);
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@ -342,9 +359,7 @@ final class Functions {
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return queryInternal(type, data, typeId, dataValue);
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}
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private static double queryAbs(double x, double y, double z, LocalSlot type, LocalSlot data) {
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final ExpressionEnvironment environment = Expression.getInstance().getEnvironment();
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private double queryAbs(double x, double y, double z, LocalSlot type, LocalSlot data) {
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// Read values from world
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final double typeId = environment.getBlockTypeAbs(x, y, z);
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final double dataValue = environment.getBlockDataAbs(x, y, z);
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@ -352,9 +367,7 @@ final class Functions {
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return queryInternal(type, data, typeId, dataValue);
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}
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private static double queryRel(double x, double y, double z, LocalSlot type, LocalSlot data) {
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final ExpressionEnvironment environment = Expression.getInstance().getEnvironment();
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private double queryRel(double x, double y, double z, LocalSlot type, LocalSlot data) {
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// Read values from world
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final double typeId = environment.getBlockTypeRel(x, y, z);
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final double dataValue = environment.getBlockDataRel(x, y, z);
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@ -362,7 +375,4 @@ final class Functions {
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return queryInternal(type, data, typeId, dataValue);
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}
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private Functions() {
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}
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}
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@ -19,13 +19,13 @@
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package com.sk89q.worldedit.internal.expression.invoke;
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import com.google.common.collect.SetMultimap;
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import com.sk89q.worldedit.antlr.ExpressionBaseVisitor;
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import com.sk89q.worldedit.antlr.ExpressionParser;
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import com.sk89q.worldedit.internal.expression.BreakException;
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import com.sk89q.worldedit.internal.expression.EvaluationException;
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import com.sk89q.worldedit.internal.expression.ExecutionData;
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import com.sk89q.worldedit.internal.expression.ExpressionHelper;
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import com.sk89q.worldedit.internal.expression.Functions;
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import com.sk89q.worldedit.internal.expression.LocalSlot;
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import it.unimi.dsi.fastutil.doubles.Double2ObjectLinkedOpenHashMap;
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import it.unimi.dsi.fastutil.doubles.Double2ObjectMap;
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@ -73,6 +73,7 @@ import static com.sk89q.worldedit.internal.expression.invoke.ExpressionHandles.D
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import static com.sk89q.worldedit.internal.expression.invoke.ExpressionHandles.IS_NULL;
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import static com.sk89q.worldedit.internal.expression.invoke.ExpressionHandles.NEW_LS_CONSTANT;
|
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import static com.sk89q.worldedit.internal.expression.invoke.ExpressionHandles.NULL_DOUBLE;
|
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import static com.sk89q.worldedit.internal.expression.invoke.ExpressionHandles.unboxDoubles;
|
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import static java.lang.invoke.MethodType.methodType;
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|
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/**
|
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@ -86,9 +87,9 @@ class CompilingVisitor extends ExpressionBaseVisitor<MethodHandle> {
|
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* (ExecutionData)Double, with a few as (ExecutionData,Double)Double where it needs an existing
|
||||
* value passed in. EVERY handle returned from an overriden method must be of the first type.
|
||||
*/
|
||||
private final SetMultimap<String, MethodHandle> functions;
|
||||
private final Functions functions;
|
||||
|
||||
CompilingVisitor(SetMultimap<String, MethodHandle> functions) {
|
||||
CompilingVisitor(Functions functions) {
|
||||
this.functions = functions;
|
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}
|
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|
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@ -136,7 +137,6 @@ class CompilingVisitor extends ExpressionBaseVisitor<MethodHandle> {
|
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|
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private MethodHandle evaluateBoolean(ParserRuleContext boolExpression) {
|
||||
MethodHandle value = evaluateForNamedValue(boolExpression, "a boolean");
|
||||
value = value.asType(value.type().unwrap());
|
||||
// Pass `value` into converter, returns (ExecutionData)boolean;
|
||||
return MethodHandles.collectArguments(
|
||||
DOUBLE_TO_BOOL, 0, value
|
||||
@ -340,13 +340,13 @@ class CompilingVisitor extends ExpressionBaseVisitor<MethodHandle> {
|
||||
// Inject left as primary condition, on failure take right with data parameter
|
||||
// logic = (Double,ExecutionData)Double
|
||||
MethodHandle logic = MethodHandles.guardWithTest(
|
||||
// data arg dropped implicitly
|
||||
// data arg dropped implicitly -- (Double)boolean;
|
||||
DOUBLE_TO_BOOL,
|
||||
// drop data arg
|
||||
// drop data arg -- (Double,ExecutionData)Double;
|
||||
MethodHandles.dropArguments(
|
||||
MethodHandles.identity(Double.class), 1, ExecutionData.class
|
||||
),
|
||||
// drop left arg, call right
|
||||
// drop left arg, call right -- (Double,ExecutionData)Double;
|
||||
MethodHandles.dropArguments(
|
||||
right, 0, Double.class
|
||||
)
|
||||
@ -367,9 +367,8 @@ class CompilingVisitor extends ExpressionBaseVisitor<MethodHandle> {
|
||||
// Map two data args to two double args, then evaluate op
|
||||
MethodHandle doubleData = MethodHandles.filterArguments(
|
||||
CALL_BINARY_OP.bindTo(op), 0,
|
||||
mhLeft.asType(mhLeft.type().unwrap()), mhRight.asType(mhRight.type().unwrap())
|
||||
unboxDoubles(mhLeft), unboxDoubles(mhRight)
|
||||
);
|
||||
doubleData = doubleData.asType(doubleData.type().wrap());
|
||||
return ExpressionHandles.dedupData(doubleData);
|
||||
}
|
||||
|
||||
|
||||
@ -19,9 +19,9 @@
|
||||
|
||||
package com.sk89q.worldedit.internal.expression.invoke;
|
||||
|
||||
import com.google.common.collect.SetMultimap;
|
||||
import com.sk89q.worldedit.antlr.ExpressionParser;
|
||||
import com.sk89q.worldedit.internal.expression.CompiledExpression;
|
||||
import com.sk89q.worldedit.internal.expression.Functions;
|
||||
|
||||
import java.lang.invoke.LambdaConversionException;
|
||||
import java.lang.invoke.LambdaMetafactory;
|
||||
@ -66,7 +66,7 @@ public class ExpressionCompiler {
|
||||
}
|
||||
|
||||
public CompiledExpression compileExpression(ExpressionParser.AllStatementsContext root,
|
||||
SetMultimap<String, MethodHandle> functions) {
|
||||
Functions functions) {
|
||||
MethodHandle invokable = root.accept(new CompilingVisitor(functions));
|
||||
return (CompiledExpression) safeInvoke(
|
||||
HANDLE_TO_CE_CONVERTER, h -> h.invoke(invokable)
|
||||
|
||||
@ -38,10 +38,10 @@ import java.lang.invoke.MethodType;
|
||||
import java.util.Objects;
|
||||
import java.util.function.DoubleBinaryOperator;
|
||||
import java.util.function.Supplier;
|
||||
import java.util.stream.Collectors;
|
||||
|
||||
import static com.sk89q.worldedit.internal.expression.ExpressionHelper.check;
|
||||
import static com.sk89q.worldedit.internal.expression.ExpressionHelper.checkIterations;
|
||||
import static com.sk89q.worldedit.internal.expression.ExpressionHelper.checkTimeout;
|
||||
import static com.sk89q.worldedit.internal.expression.ExpressionHelper.getErrorPosition;
|
||||
import static java.lang.invoke.MethodHandles.collectArguments;
|
||||
import static java.lang.invoke.MethodHandles.constant;
|
||||
@ -63,8 +63,11 @@ class ExpressionHandles {
|
||||
private static final MethodHandle SIMPLE_FOR_LOOP_IMPL;
|
||||
private static final MethodHandle SWITCH_IMPL;
|
||||
|
||||
// (Object)boolean;
|
||||
static final MethodHandle IS_NULL;
|
||||
// (Double)boolean;
|
||||
static final MethodHandle DOUBLE_TO_BOOL;
|
||||
// (double, double)Double;
|
||||
static final MethodHandle CALL_BINARY_OP;
|
||||
static final MethodHandle NEW_LS_CONSTANT;
|
||||
|
||||
@ -95,10 +98,11 @@ class ExpressionHandles {
|
||||
|
||||
IS_NULL = lookup.findStatic(Objects.class, "isNull",
|
||||
methodType(boolean.class, Object.class));
|
||||
DOUBLE_TO_BOOL = lookup.findStatic(ExpressionHandles.class, "doubleToBool",
|
||||
methodType(boolean.class, double.class));
|
||||
DOUBLE_TO_BOOL = boxDoubles(lookup.findStatic(ExpressionHandles.class, "doubleToBool",
|
||||
methodType(boolean.class, double.class)));
|
||||
CALL_BINARY_OP = lookup.findVirtual(DoubleBinaryOperator.class, "applyAsDouble",
|
||||
methodType(double.class, double.class, double.class));
|
||||
methodType(double.class, double.class, double.class))
|
||||
.asType(methodType(Double.class, DoubleBinaryOperator.class, double.class, double.class));
|
||||
NEW_LS_CONSTANT = lookup.findConstructor(LocalSlot.Constant.class,
|
||||
methodType(void.class, double.class));
|
||||
} catch (NoSuchMethodException | IllegalAccessException e) {
|
||||
@ -106,6 +110,34 @@ class ExpressionHandles {
|
||||
}
|
||||
}
|
||||
|
||||
static MethodHandle boxDoubles(MethodHandle handle) {
|
||||
MethodType type = handle.type();
|
||||
type = methodType(
|
||||
boxIfPrimitiveDouble(type.returnType()),
|
||||
type.parameterList().stream().map(ExpressionHandles::boxIfPrimitiveDouble)
|
||||
.collect(Collectors.toList())
|
||||
);
|
||||
return handle.asType(type);
|
||||
}
|
||||
|
||||
private static Class<?> boxIfPrimitiveDouble(Class<?> clazz) {
|
||||
return clazz == double.class ? Double.class : clazz;
|
||||
}
|
||||
|
||||
static MethodHandle unboxDoubles(MethodHandle handle) {
|
||||
MethodType type = handle.type();
|
||||
type = methodType(
|
||||
unboxIfDouble(type.returnType()),
|
||||
type.parameterList().stream().map(ExpressionHandles::unboxIfDouble)
|
||||
.collect(Collectors.toList())
|
||||
);
|
||||
return handle.asType(type);
|
||||
}
|
||||
|
||||
private static Class<?> unboxIfDouble(Class<?> clazz) {
|
||||
return clazz == Double.class ? double.class : clazz;
|
||||
}
|
||||
|
||||
@FunctionalInterface
|
||||
interface Invokable {
|
||||
Object invoke(MethodHandle handle) throws Throwable;
|
||||
@ -237,7 +269,7 @@ class ExpressionHandles {
|
||||
}
|
||||
while ((boolean) standardInvoke(condition, data)) {
|
||||
checkIterations(iterations, body.ctx);
|
||||
checkTimeout();
|
||||
data.checkDeadline();
|
||||
iterations++;
|
||||
try {
|
||||
result = (Double) standardInvoke(body.handle, data);
|
||||
@ -264,7 +296,7 @@ class ExpressionHandles {
|
||||
int iterations = 0;
|
||||
do {
|
||||
checkIterations(iterations, body.ctx);
|
||||
checkTimeout();
|
||||
data.checkDeadline();
|
||||
iterations++;
|
||||
try {
|
||||
result = (Double) standardInvoke(body.handle, data);
|
||||
@ -297,7 +329,7 @@ class ExpressionHandles {
|
||||
LocalSlot.Variable variable = initVariable(data, counterToken);
|
||||
for (double i = first; i <= last; i++) {
|
||||
checkIterations(iterations, body.ctx);
|
||||
checkTimeout();
|
||||
data.checkDeadline();
|
||||
iterations++;
|
||||
variable.setValue(i);
|
||||
try {
|
||||
|
||||
@ -47,6 +47,12 @@ class ExpressionTest extends BaseExpressionTest {
|
||||
|
||||
// check variables
|
||||
assertEquals(8, compile("foo+bar", "foo", "bar").evaluate(5D, 3D), 0);
|
||||
|
||||
// check conditionals
|
||||
assertEquals(5, simpleEval("0 || 5"), 0);
|
||||
assertEquals(2, simpleEval("2 || 5"), 0);
|
||||
assertEquals(5, simpleEval("2 && 5"), 0);
|
||||
assertEquals(0, simpleEval("5 && 0"), 0);
|
||||
}
|
||||
|
||||
@Test
|
||||
|
||||
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