Accessing the "AST" from an active annotation processor
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Norbert Sándor
May 10, 2016, 8:26:27 AM5/10/16
to Xtend Programming Language
Hello,
I try to access the "AST" of a method's body to implement complex annotation processors.
I realized that it is not easy :)
The first problem was that the implementations of XExpression are loaded by a separate classloader - I can live with it, I use reflection in my simple processor.
But there are bigger problems, like calling XFeatureCallImplCustom.getFeature() from my processor invalidates the Xtend editors, e.g. parameters and methods are not resolved (only in the editor, the Problems view shows no errors).
My question: is there a supported (or side effect free) way to access the "AST"?
(I have great ideas how it could be used ;)
Thanks.
BR,
Norbi
I try to access the "AST" of a method's body to implement complex annotation processors.
I realized that it is not easy :)
The first problem was that the implementations of XExpression are loaded by a separate classloader - I can live with it, I use reflection in my simple processor.
But there are bigger problems, like calling XFeatureCallImplCustom.getFeature() from my processor invalidates the Xtend editors, e.g. parameters and methods are not resolved (only in the editor, the Problems view shows no errors).
My question: is there a supported (or side effect free) way to access the "AST"?
(I have great ideas how it could be used ;)
Thanks.
BR,
Norbi
Norbert Sándor
May 10, 2016, 1:15:24 PM5/10/16
to Xtend Programming Language
It seems that the weird error is gone as soon as the annotation processor is referenced as an external dependency (i.e. as a JAR instead of as a project inside the same Eclipse workspace).
(Although this makes the development much more difficult...)
--
Norbi
(Although this makes the development much more difficult...)
--
Norbi
Sven Efftinge (sven@efftinge.de)
May 10, 2016, 1:40:15 PM5/10/16
to xtend...@googlegroups.com
Hi Norbert,
there is no supported way to access anything else than the types from the xtend.lib.macro bundle.
Anything you do via reflection to get to the internals is at your own risk and might not work in future releases.
Sven
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Norbert Sándor
May 10, 2016, 3:00:24 PM5/10/16
to Xtend Programming Language
> might not work in future releases
I know but my idea is too interesting :)
But unfortunatelly I haven't got too far.
E.g. even in case of this simple code
(The other parts are straightforward e.g. XNumberLiteralImpl and XBinaryOperationImplCustom.)
Could you help me how to extract useful information from XAbstractFeatureCallImplCustom?
How can I "detect" that it is a local variable / parameter "reference"?
BR.
Norbi
But unfortunatelly I haven't got too far.
E.g. even in case of this simple code
def add(int b) {
b + 2
}
I don't know how to extract some information about the b parameter from the corresponding XAbstractFeatureCallImplCustom.b + 2
}
(The other parts are straightforward e.g. XNumberLiteralImpl and XBinaryOperationImplCustom.)
Could you help me how to extract useful information from XAbstractFeatureCallImplCustom?
How can I "detect" that it is a local variable / parameter "reference"?
BR.
Norbi
Norbert Sándor
May 10, 2016, 5:29:46 PM5/10/16
to Xtend Programming Language
I think you're right, I should give up experimenting with unsupported features :|
This is the mysterious exception I get when calling XAbstractFeatureCallImplCustom.getFeature() (but it's only a guess that I should call this method):
java.lang.RuntimeException: Cannot root twice
at org.eclipse.xtext.xbase.typesystem.internal.DefaultBatchTypeResolver$1.add(DefaultBatchTypeResolver.java:73)
at org.eclipse.xtext.xbase.typesystem.internal.DefaultBatchTypeResolver$1.add(DefaultBatchTypeResolver.java:1)
at org.eclipse.xtext.xbase.typesystem.internal.LogicalContainerAwareReentrantTypeResolver$1.add(LogicalContainerAwareReentrantTypeResolver.java:318)
at org.eclipse.xtext.xbase.typesystem.internal.LogicalContainerAwareReentrantTypeResolver$1.add(LogicalContainerAwareReentrantTypeResolver.java:1)
at org.eclipse.xtext.xbase.typesystem.internal.LogicalContainerAwareReentrantTypeResolver.recordExpressions(LogicalContainerAwareReentrantTypeResolver.java:409)
at org.eclipse.xtext.xbase.typesystem.internal.LogicalContainerAwareReentrantTypeResolver._recordExpressions(LogicalContainerAwareReentrantTypeResolver.java:439)
at org.eclipse.xtext.xbase.typesystem.internal.LogicalContainerAwareReentrantTypeResolver.recordExpressions(LogicalContainerAwareReentrantTypeResolver.java:412)
at org.eclipse.xtext.xbase.typesystem.internal.LogicalContainerAwareReentrantTypeResolver.prepare(LogicalContainerAwareReentrantTypeResolver.java:401)
at org.eclipse.xtext.xbase.typesystem.internal.LogicalContainerAwareReentrantTypeResolver.computeTypes(LogicalContainerAwareReentrantTypeResolver.java:689)
at org.eclipse.xtend.core.typesystem.XtendReentrantTypeResolver.computeTypes(XtendReentrantTypeResolver.java:382)
at org.eclipse.xtext.xbase.typesystem.internal.DefaultReentrantTypeResolver.resolve(DefaultReentrantTypeResolver.java:163)
at org.eclipse.xtext.xbase.typesystem.internal.DefaultReentrantTypeResolver.reentrantResolve(DefaultReentrantTypeResolver.java:139)
at org.eclipse.xtext.xbase.typesystem.internal.CompoundReentrantTypeResolver.reentrantResolve(CompoundReentrantTypeResolver.java:79)
at org.eclipse.xtext.xbase.typesystem.internal.CachingBatchTypeResolver$LazyResolvedTypes.resolveTypes(CachingBatchTypeResolver.java:80)
at org.eclipse.xtext.xbase.typesystem.internal.CachingBatchTypeResolver$2.process(CachingBatchTypeResolver.java:57)
at org.eclipse.xtext.xbase.typesystem.internal.CachingBatchTypeResolver$2.process(CachingBatchTypeResolver.java:1)
at org.eclipse.xtext.util.concurrent.IUnitOfWork$Void.exec(IUnitOfWork.java:37)
at org.eclipse.xtext.util.OnChangeEvictingCache.execWithoutCacheClear(OnChangeEvictingCache.java:129)
at org.eclipse.xtext.xbase.typesystem.internal.CachingBatchTypeResolver.doResolveTypes(CachingBatchTypeResolver.java:53)
at org.eclipse.xtext.xbase.typesystem.internal.AbstractBatchTypeResolver.resolveTypes(AbstractBatchTypeResolver.java:69)
at org.eclipse.xtext.xbase.resource.BatchLinkingService.resolveBatched(BatchLinkingService.java:71)
at org.eclipse.xtext.xbase.resource.BatchLinkableResource.resolveLazyCrossReferences(BatchLinkableResource.java:165)
at org.eclipse.xtext.EcoreUtil2.resolveLazyCrossReferences(EcoreUtil2.java:498)
at org.eclipse.xtext.xbase.compiler.CompilationTestHelper$Result.doLinking(CompilationTestHelper.java:480)
at org.eclipse.xtext.xbase.compiler.CompilationTestHelper$Result.doValidation(CompilationTestHelper.java:486)
at org.eclipse.xtext.xbase.compiler.CompilationTestHelper$Result.doGenerate(CompilationTestHelper.java:503)
at org.eclipse.xtext.xbase.compiler.CompilationTestHelper.compile(CompilationTestHelper.java:221)
at org.eclipse.xtext.xbase.compiler.CompilationTestHelper.compile(CompilationTestHelper.java:181)
at org.eclipse.xtend.core.compiler.batch.XtendCompilerTester.compile(XtendCompilerTester.java:87)
at com.erinors.appbase.data.test.DebugHelperTest.test(DebugHelperTest.java:55)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
at java.lang.reflect.Method.invoke(Method.java:498)
at org.junit.runners.model.FrameworkMethod$1.runReflectiveCall(FrameworkMethod.java:50)
at org.junit.internal.runners.model.ReflectiveCallable.run(ReflectiveCallable.java:12)
at org.junit.runners.model.FrameworkMethod.invokeExplosively(FrameworkMethod.java:47)
at org.junit.internal.runners.statements.InvokeMethod.evaluate(InvokeMethod.java:17)
at org.junit.runners.ParentRunner.runLeaf(ParentRunner.java:325)
at org.junit.runners.BlockJUnit4ClassRunner.runChild(BlockJUnit4ClassRunner.java:78)
at org.junit.runners.BlockJUnit4ClassRunner.runChild(BlockJUnit4ClassRunner.java:57)
at org.junit.runners.ParentRunner$3.run(ParentRunner.java:290)
at org.junit.runners.ParentRunner$1.schedule(ParentRunner.java:71)
at org.junit.runners.ParentRunner.runChildren(ParentRunner.java:288)
at org.junit.runners.ParentRunner.access$000(ParentRunner.java:58)
at org.junit.runners.ParentRunner$2.evaluate(ParentRunner.java:268)
at org.junit.runners.ParentRunner.run(ParentRunner.java:363)
at org.eclipse.jdt.internal.junit4.runner.JUnit4TestReference.run(JUnit4TestReference.java:86)
at org.eclipse.jdt.internal.junit.runner.TestExecution.run(TestExecution.java:38)
at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.runTests(RemoteTestRunner.java:459)
at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.runTests(RemoteTestRunner.java:670)
at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.run(RemoteTestRunner.java:382)
at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.main(RemoteTestRunner.java:192)
Caused by: java.lang.Throwable
at org.eclipse.xtext.xbase.typesystem.internal.DefaultBatchTypeResolver$1.add(DefaultBatchTypeResolver.java:71)
at org.eclipse.xtext.xbase.typesystem.internal.DefaultBatchTypeResolver$1.add(DefaultBatchTypeResolver.java:1)
at org.eclipse.xtext.xbase.typesystem.internal.LogicalContainerAwareReentrantTypeResolver$1.add(LogicalContainerAwareReentrantTypeResolver.java:318)
at org.eclipse.xtext.xbase.typesystem.internal.LogicalContainerAwareReentrantTypeResolver$1.add(LogicalContainerAwareReentrantTypeResolver.java:1)
at org.eclipse.xtend.core.typesystem.XtendReentrantTypeResolver.computeDanglingExpressionType(XtendReentrantTypeResolver.java:445)
at org.eclipse.xtend.core.typesystem.XtendReentrantTypeResolver.computeTypes(XtendReentrantTypeResolver.java:430)
at org.eclipse.xtend.core.typesystem.XtendReentrantTypeResolver.computeTypes(XtendReentrantTypeResolver.java:403)
at org.eclipse.xtend.core.typesystem.XtendReentrantTypeResolver.computeTypes(XtendReentrantTypeResolver.java:390)
at org.eclipse.xtend.core.typesystem.XtendReentrantTypeResolver.computeTypes(XtendReentrantTypeResolver.java:380)
at org.eclipse.xtext.xbase.typesystem.internal.DefaultReentrantTypeResolver.resolve(DefaultReentrantTypeResolver.java:163)
at org.eclipse.xtext.xbase.typesystem.internal.DefaultReentrantTypeResolver.reentrantResolve(DefaultReentrantTypeResolver.java:139)
at org.eclipse.xtext.xbase.typesystem.internal.CompoundReentrantTypeResolver.reentrantResolve(CompoundReentrantTypeResolver.java:79)
at org.eclipse.xtext.xbase.typesystem.internal.CachingBatchTypeResolver$LazyResolvedTypes.resolveTypes(CachingBatchTypeResolver.java:80)
at org.eclipse.xtext.xbase.typesystem.internal.CachingBatchTypeResolver$2.process(CachingBatchTypeResolver.java:57)
at org.eclipse.xtext.xbase.typesystem.internal.CachingBatchTypeResolver$2.process(CachingBatchTypeResolver.java:1)
at org.eclipse.xtext.util.concurrent.IUnitOfWork$Void.exec(IUnitOfWork.java:37)
at org.eclipse.xtext.util.OnChangeEvictingCache.execWithoutCacheClear(OnChangeEvictingCache.java:129)
at org.eclipse.xtext.xbase.typesystem.internal.CachingBatchTypeResolver.doResolveTypes(CachingBatchTypeResolver.java:53)
at org.eclipse.xtext.xbase.typesystem.internal.AbstractBatchTypeResolver.resolveTypes(AbstractBatchTypeResolver.java:69)
at org.eclipse.xtext.xbase.resource.BatchLinkingService.resolveBatched(BatchLinkingService.java:60)
at org.eclipse.xtext.xbase.resource.BatchLinkingService.resolveBatched(BatchLinkingService.java:41)
at org.eclipse.xtext.xbase.resource.BatchLinkableResource.getEObject(BatchLinkableResource.java:117)
at org.eclipse.emf.ecore.resource.impl.ResourceSetImpl.getEObject(ResourceSetImpl.java:223)
at org.eclipse.emf.ecore.util.EcoreUtil.resolve(EcoreUtil.java:199)
at org.eclipse.emf.ecore.util.EcoreUtil.resolve(EcoreUtil.java:259)
at org.eclipse.emf.ecore.impl.BasicEObjectImpl.eResolveProxy(BasicEObjectImpl.java:1477)
at org.eclipse.xtext.xbase.impl.XAbstractFeatureCallImplCustom.getFeature(XAbstractFeatureCallImplCustom.java:48)
This is the mysterious exception I get when calling XAbstractFeatureCallImplCustom.getFeature() (but it's only a guess that I should call this method):
java.lang.RuntimeException: Cannot root twice
at org.eclipse.xtext.xbase.typesystem.internal.DefaultBatchTypeResolver$1.add(DefaultBatchTypeResolver.java:73)
at org.eclipse.xtext.xbase.typesystem.internal.DefaultBatchTypeResolver$1.add(DefaultBatchTypeResolver.java:1)
at org.eclipse.xtext.xbase.typesystem.internal.LogicalContainerAwareReentrantTypeResolver$1.add(LogicalContainerAwareReentrantTypeResolver.java:318)
at org.eclipse.xtext.xbase.typesystem.internal.LogicalContainerAwareReentrantTypeResolver$1.add(LogicalContainerAwareReentrantTypeResolver.java:1)
at org.eclipse.xtext.xbase.typesystem.internal.LogicalContainerAwareReentrantTypeResolver.recordExpressions(LogicalContainerAwareReentrantTypeResolver.java:409)
at org.eclipse.xtext.xbase.typesystem.internal.LogicalContainerAwareReentrantTypeResolver._recordExpressions(LogicalContainerAwareReentrantTypeResolver.java:439)
at org.eclipse.xtext.xbase.typesystem.internal.LogicalContainerAwareReentrantTypeResolver.recordExpressions(LogicalContainerAwareReentrantTypeResolver.java:412)
at org.eclipse.xtext.xbase.typesystem.internal.LogicalContainerAwareReentrantTypeResolver.prepare(LogicalContainerAwareReentrantTypeResolver.java:401)
at org.eclipse.xtext.xbase.typesystem.internal.LogicalContainerAwareReentrantTypeResolver.computeTypes(LogicalContainerAwareReentrantTypeResolver.java:689)
at org.eclipse.xtend.core.typesystem.XtendReentrantTypeResolver.computeTypes(XtendReentrantTypeResolver.java:382)
at org.eclipse.xtext.xbase.typesystem.internal.DefaultReentrantTypeResolver.resolve(DefaultReentrantTypeResolver.java:163)
at org.eclipse.xtext.xbase.typesystem.internal.DefaultReentrantTypeResolver.reentrantResolve(DefaultReentrantTypeResolver.java:139)
at org.eclipse.xtext.xbase.typesystem.internal.CompoundReentrantTypeResolver.reentrantResolve(CompoundReentrantTypeResolver.java:79)
at org.eclipse.xtext.xbase.typesystem.internal.CachingBatchTypeResolver$LazyResolvedTypes.resolveTypes(CachingBatchTypeResolver.java:80)
at org.eclipse.xtext.xbase.typesystem.internal.CachingBatchTypeResolver$2.process(CachingBatchTypeResolver.java:57)
at org.eclipse.xtext.xbase.typesystem.internal.CachingBatchTypeResolver$2.process(CachingBatchTypeResolver.java:1)
at org.eclipse.xtext.util.concurrent.IUnitOfWork$Void.exec(IUnitOfWork.java:37)
at org.eclipse.xtext.util.OnChangeEvictingCache.execWithoutCacheClear(OnChangeEvictingCache.java:129)
at org.eclipse.xtext.xbase.typesystem.internal.CachingBatchTypeResolver.doResolveTypes(CachingBatchTypeResolver.java:53)
at org.eclipse.xtext.xbase.typesystem.internal.AbstractBatchTypeResolver.resolveTypes(AbstractBatchTypeResolver.java:69)
at org.eclipse.xtext.xbase.resource.BatchLinkingService.resolveBatched(BatchLinkingService.java:71)
at org.eclipse.xtext.xbase.resource.BatchLinkableResource.resolveLazyCrossReferences(BatchLinkableResource.java:165)
at org.eclipse.xtext.EcoreUtil2.resolveLazyCrossReferences(EcoreUtil2.java:498)
at org.eclipse.xtext.xbase.compiler.CompilationTestHelper$Result.doLinking(CompilationTestHelper.java:480)
at org.eclipse.xtext.xbase.compiler.CompilationTestHelper$Result.doValidation(CompilationTestHelper.java:486)
at org.eclipse.xtext.xbase.compiler.CompilationTestHelper$Result.doGenerate(CompilationTestHelper.java:503)
at org.eclipse.xtext.xbase.compiler.CompilationTestHelper.compile(CompilationTestHelper.java:221)
at org.eclipse.xtext.xbase.compiler.CompilationTestHelper.compile(CompilationTestHelper.java:181)
at org.eclipse.xtend.core.compiler.batch.XtendCompilerTester.compile(XtendCompilerTester.java:87)
at com.erinors.appbase.data.test.DebugHelperTest.test(DebugHelperTest.java:55)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
at java.lang.reflect.Method.invoke(Method.java:498)
at org.junit.runners.model.FrameworkMethod$1.runReflectiveCall(FrameworkMethod.java:50)
at org.junit.internal.runners.model.ReflectiveCallable.run(ReflectiveCallable.java:12)
at org.junit.runners.model.FrameworkMethod.invokeExplosively(FrameworkMethod.java:47)
at org.junit.internal.runners.statements.InvokeMethod.evaluate(InvokeMethod.java:17)
at org.junit.runners.ParentRunner.runLeaf(ParentRunner.java:325)
at org.junit.runners.BlockJUnit4ClassRunner.runChild(BlockJUnit4ClassRunner.java:78)
at org.junit.runners.BlockJUnit4ClassRunner.runChild(BlockJUnit4ClassRunner.java:57)
at org.junit.runners.ParentRunner$3.run(ParentRunner.java:290)
at org.junit.runners.ParentRunner$1.schedule(ParentRunner.java:71)
at org.junit.runners.ParentRunner.runChildren(ParentRunner.java:288)
at org.junit.runners.ParentRunner.access$000(ParentRunner.java:58)
at org.junit.runners.ParentRunner$2.evaluate(ParentRunner.java:268)
at org.junit.runners.ParentRunner.run(ParentRunner.java:363)
at org.eclipse.jdt.internal.junit4.runner.JUnit4TestReference.run(JUnit4TestReference.java:86)
at org.eclipse.jdt.internal.junit.runner.TestExecution.run(TestExecution.java:38)
at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.runTests(RemoteTestRunner.java:459)
at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.runTests(RemoteTestRunner.java:670)
at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.run(RemoteTestRunner.java:382)
at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.main(RemoteTestRunner.java:192)
Caused by: java.lang.Throwable
at org.eclipse.xtext.xbase.typesystem.internal.DefaultBatchTypeResolver$1.add(DefaultBatchTypeResolver.java:71)
at org.eclipse.xtext.xbase.typesystem.internal.DefaultBatchTypeResolver$1.add(DefaultBatchTypeResolver.java:1)
at org.eclipse.xtext.xbase.typesystem.internal.LogicalContainerAwareReentrantTypeResolver$1.add(LogicalContainerAwareReentrantTypeResolver.java:318)
at org.eclipse.xtext.xbase.typesystem.internal.LogicalContainerAwareReentrantTypeResolver$1.add(LogicalContainerAwareReentrantTypeResolver.java:1)
at org.eclipse.xtend.core.typesystem.XtendReentrantTypeResolver.computeDanglingExpressionType(XtendReentrantTypeResolver.java:445)
at org.eclipse.xtend.core.typesystem.XtendReentrantTypeResolver.computeTypes(XtendReentrantTypeResolver.java:430)
at org.eclipse.xtend.core.typesystem.XtendReentrantTypeResolver.computeTypes(XtendReentrantTypeResolver.java:403)
at org.eclipse.xtend.core.typesystem.XtendReentrantTypeResolver.computeTypes(XtendReentrantTypeResolver.java:390)
at org.eclipse.xtend.core.typesystem.XtendReentrantTypeResolver.computeTypes(XtendReentrantTypeResolver.java:380)
at org.eclipse.xtext.xbase.typesystem.internal.DefaultReentrantTypeResolver.resolve(DefaultReentrantTypeResolver.java:163)
at org.eclipse.xtext.xbase.typesystem.internal.DefaultReentrantTypeResolver.reentrantResolve(DefaultReentrantTypeResolver.java:139)
at org.eclipse.xtext.xbase.typesystem.internal.CompoundReentrantTypeResolver.reentrantResolve(CompoundReentrantTypeResolver.java:79)
at org.eclipse.xtext.xbase.typesystem.internal.CachingBatchTypeResolver$LazyResolvedTypes.resolveTypes(CachingBatchTypeResolver.java:80)
at org.eclipse.xtext.xbase.typesystem.internal.CachingBatchTypeResolver$2.process(CachingBatchTypeResolver.java:57)
at org.eclipse.xtext.xbase.typesystem.internal.CachingBatchTypeResolver$2.process(CachingBatchTypeResolver.java:1)
at org.eclipse.xtext.util.concurrent.IUnitOfWork$Void.exec(IUnitOfWork.java:37)
at org.eclipse.xtext.util.OnChangeEvictingCache.execWithoutCacheClear(OnChangeEvictingCache.java:129)
at org.eclipse.xtext.xbase.typesystem.internal.CachingBatchTypeResolver.doResolveTypes(CachingBatchTypeResolver.java:53)
at org.eclipse.xtext.xbase.typesystem.internal.AbstractBatchTypeResolver.resolveTypes(AbstractBatchTypeResolver.java:69)
at org.eclipse.xtext.xbase.resource.BatchLinkingService.resolveBatched(BatchLinkingService.java:60)
at org.eclipse.xtext.xbase.resource.BatchLinkingService.resolveBatched(BatchLinkingService.java:41)
at org.eclipse.xtext.xbase.resource.BatchLinkableResource.getEObject(BatchLinkableResource.java:117)
at org.eclipse.emf.ecore.resource.impl.ResourceSetImpl.getEObject(ResourceSetImpl.java:223)
at org.eclipse.emf.ecore.util.EcoreUtil.resolve(EcoreUtil.java:199)
at org.eclipse.emf.ecore.util.EcoreUtil.resolve(EcoreUtil.java:259)
at org.eclipse.emf.ecore.impl.BasicEObjectImpl.eResolveProxy(BasicEObjectImpl.java:1477)
at org.eclipse.xtext.xbase.impl.XAbstractFeatureCallImplCustom.getFeature(XAbstractFeatureCallImplCustom.java:48)
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