public final class CheckNullableReturn extends Object implements HotSwapCompilerPass, NodeTraversal.Callback
Modifier and Type | Field and Description |
---|---|
static DiagnosticType |
NULLABLE_RETURN |
static DiagnosticType |
NULLABLE_RETURN_WITH_NAME |
Constructor and Description |
---|
CheckNullableReturn(AbstractCompiler compiler) |
Modifier and Type | Method and Description |
---|---|
static boolean |
canReturnNull(ControlFlowGraph<Node> graph) |
static boolean |
hasReturnDeclaredNullable(Node n) |
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 pre order (before visiting its children) and decides
whether this node's children should be traversed.
|
void |
visit(NodeTraversal t,
Node n,
Node parent)
Visits a node in postorder (after its children have been visited).
|
public static final DiagnosticType NULLABLE_RETURN
public static final DiagnosticType NULLABLE_RETURN_WITH_NAME
public CheckNullableReturn(AbstractCompiler compiler)
public static boolean hasReturnDeclaredNullable(Node n)
public void visit(NodeTraversal t, Node n, Node parent)
NodeTraversal.Callback
Visits a node in postorder (after its children have been visited).
A node is visited only if all its parents should be traversed
(NodeTraversal.Callback.shouldTraverse(NodeTraversal, Node, Node)
).
Implementations can have side effects (e.g. modifying the parse tree).
visit
in interface NodeTraversal.Callback
public static boolean canReturnNull(ControlFlowGraph<Node> graph)
public boolean shouldTraverse(NodeTraversal nodeTraversal, Node n, Node parent)
NodeTraversal.Callback
Visits a node in pre order (before visiting its children) and decides
whether this node's children should be traversed. If children are
traversed, they will be visited by
NodeTraversal.Callback.visit(NodeTraversal, Node, Node)
in postorder.
Implementations can have side effects (e.g. modifying the parse tree).
shouldTraverse
in interface NodeTraversal.Callback
public void process(Node externs, Node root)
CompilerPass
process
in interface CompilerPass
externs
- Top of external JS treeroot
- Top of JS treepublic void hotSwapScript(Node scriptRoot, Node originalRoot)
HotSwapCompilerPass
hotSwapScript
in interface HotSwapCompilerPass
scriptRoot
- Root node corresponding to the file that is modified,
should be of type Token.SCRIPT
.originalRoot
- Root node corresponding to the original version of the
file that is modified. Should be of type token.SCRIPT
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