Class NodeTraversal.AbstractScopedCallback
- java.lang.Object
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- com.google.javascript.jscomp.NodeTraversal.AbstractScopedCallback
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- All Implemented Interfaces:
NodeTraversal.Callback
,NodeTraversal.ScopedCallback
- Enclosing class:
- NodeTraversal
public abstract static class NodeTraversal.AbstractScopedCallback extends java.lang.Object implements NodeTraversal.ScopedCallback
Abstract scoped callback to visit all nodes in postorder.
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Constructor Summary
Constructors Constructor Description AbstractScopedCallback()
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Method Summary
All Methods Instance Methods Concrete Methods Modifier and Type Method Description void
enterScope(NodeTraversal t)
Called immediately after entering a new scope.void
exitScope(NodeTraversal t)
Called immediately before exiting a scope.boolean
shouldTraverse(NodeTraversal nodeTraversal, Node n, Node parent)
Visits a node in preorder (before its children) and decides whether the node and its children should be traversed.-
Methods inherited from class java.lang.Object
clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait
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Methods inherited from interface com.google.javascript.jscomp.NodeTraversal.Callback
visit
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Method Detail
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shouldTraverse
public final boolean shouldTraverse(NodeTraversal nodeTraversal, Node n, Node parent)
Description copied from interface:NodeTraversal.Callback
Visits a node in preorder (before its children) and decides whether the node and its children should be traversed.If this method returns true, the node will be visited by
NodeTraversal.Callback.visit(NodeTraversal, Node, Node)
in postorder and its children will be visited by bothNodeTraversal.Callback.shouldTraverse(NodeTraversal, Node, Node)
in preorder and byNodeTraversal.Callback.visit(NodeTraversal, Node, Node)
in postorder.If this method returns false, the node will not be visited by
NodeTraversal.Callback.visit(NodeTraversal, Node, Node)
and its children will neither be visited byNodeTraversal.Callback.shouldTraverse(NodeTraversal, Node, Node)
norNodeTraversal.Callback.visit(NodeTraversal, Node, Node)
.Siblings are always visited left-to-right.
Implementations can have side-effects (e.g. modify the parse tree). Removing the current node is legal, but removing or reordering nodes above the current node may cause nodes to be visited twice or not at all.
- Specified by:
shouldTraverse
in interfaceNodeTraversal.Callback
- Parameters:
nodeTraversal
- The current traversal.n
- The current node.parent
- The parent of the current node.- Returns:
- whether the children of this node should be visited
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enterScope
public void enterScope(NodeTraversal t)
Description copied from interface:NodeTraversal.ScopedCallback
Called immediately after entering a new scope. The new scope can be accessed through t.getScope()- Specified by:
enterScope
in interfaceNodeTraversal.ScopedCallback
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exitScope
public void exitScope(NodeTraversal t)
Description copied from interface:NodeTraversal.ScopedCallback
Called immediately before exiting a scope. The ending scope can be accessed through t.getScope()- Specified by:
exitScope
in interfaceNodeTraversal.ScopedCallback
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