Class CheckPrototypeProperties
- java.lang.Object
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- com.google.javascript.jscomp.lint.CheckPrototypeProperties
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- All Implemented Interfaces:
CompilerPass
,HotSwapCompilerPass
,NodeTraversal.Callback
public final class CheckPrototypeProperties extends java.lang.Object implements HotSwapCompilerPass, NodeTraversal.Callback
Checks when a mutable property is assigned to a prototype. This is generally undesirable because it can lead to the following unexpected situation./** @constructor * / function MyClass() {} MyClass.prototype.prop = []; x = new MyClass; y = new MyClass; x.prop.push(1); console.log(y.prop) // [1]
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Field Summary
Fields Modifier and Type Field Description static DiagnosticType
ILLEGAL_PROTOTYPE_MEMBER
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Constructor Summary
Constructors Constructor Description CheckPrototypeProperties(AbstractCompiler compiler)
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Method Summary
All Methods Instance Methods Concrete Methods Modifier and Type Method Description void
hotSwapScript(Node scriptRoot, Node originalRoot)
Process the JS with root node root.void
process(Node externs, Node root)
Process the JS with root node root.boolean
shouldTraverse(NodeTraversal nodeTraversal, Node n, Node parent)
Visits a node in preorder (before its children) and decides whether its children should be traversed.void
visit(NodeTraversal unused, Node n, Node parent)
Visits a node in postorder (after its children).
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Field Detail
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ILLEGAL_PROTOTYPE_MEMBER
public static final DiagnosticType ILLEGAL_PROTOTYPE_MEMBER
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Constructor Detail
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CheckPrototypeProperties
public CheckPrototypeProperties(AbstractCompiler compiler)
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Method Detail
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process
public void process(Node externs, Node root)
Description copied from interface:CompilerPass
Process the JS with root node root. Can modify the contents of each Node tree- Specified by:
process
in interfaceCompilerPass
- Parameters:
externs
- Top of external JS treeroot
- Top of JS tree
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hotSwapScript
public void hotSwapScript(Node scriptRoot, Node originalRoot)
Description copied from interface:HotSwapCompilerPass
Process the JS with root node root. This is supposed to be significantly faster compared to corresponding full-compiler passes.- Specified by:
hotSwapScript
in interfaceHotSwapCompilerPass
- Parameters:
scriptRoot
- Root node corresponding to the file that is modified, should be of typeToken.SCRIPT
.originalRoot
- Root node corresponding to the original version of the file that is modified. Should be of typetoken.SCRIPT
.
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visit
public void visit(NodeTraversal unused, Node n, Node parent)
Description copied from interface:NodeTraversal.Callback
Visits a node in postorder (after its children). A node is visited in postorder iffNodeTraversal.Callback.shouldTraverse(NodeTraversal, Node, Node)
returned true for its parent. In particular, the root node is never visited in postorder.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:
visit
in interfaceNodeTraversal.Callback
- Parameters:
unused
- The current traversal.n
- The current node.parent
- The parent of the current node.
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shouldTraverse
public 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 its children should be traversed. If the children should be traversed, they will be visited byNodeTraversal.Callback.shouldTraverse(NodeTraversal, Node, Node)
in preorder and byNodeTraversal.Callback.visit(NodeTraversal, Node, Node)
in postorder.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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