Package com.google.javascript.jscomp

Class JsMessageVisitor

java.lang.Object

com.google.javascript.jscomp.NodeTraversal.AbstractPostOrderCallback

com.google.javascript.jscomp.JsMessageVisitor

All Implemented Interfaces:

CompilerPass, NodeTraversal.Callback

@GwtIncompatible("JsMessage, java.util.regex")
public abstract class JsMessageVisitor
extends NodeTraversal.AbstractPostOrderCallback
implements CompilerPass

Traverses across parsed tree and finds I18N messages. Then it passes it to processJsMessage(JsMessage, JsMessageDefinition).

Constructor Summary

Constructors

Modifier	Constructor	Description
protected	JsMessageVisitor(AbstractCompiler compiler, boolean needToCheckDuplications, JsMessage.Style style, JsMessage.IdGenerator idGenerator)	Creates JS message visitor.

Method Summary

Modifier and Type	Method	Description
protected void	checkNode(Node node, Token type)	Checks a node's type.
void	process(Node externs, Node root)	Process the JS with root node root.
protected abstract void	processJsMessage(JsMessage message, JsMessageDefinition definition)	Processes found JS message.
void	visit(NodeTraversal traversal, Node node, Node unused)	Visits a node in postorder (after its children).

Methods inherited from class com.google.javascript.jscomp.NodeTraversal.AbstractPostOrderCallback

shouldTraverse

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Constructor Detail

JsMessageVisitor

protected JsMessageVisitor(AbstractCompiler compiler,
                           boolean needToCheckDuplications,
                           JsMessage.Style style,
                           JsMessage.IdGenerator idGenerator)

Creates JS message visitor.

Parameters:

compiler - the compiler instance

needToCheckDuplications - whether to check duplicated messages in traversed

style - style that should be used during parsing

idGenerator - generator that used for creating unique ID for the message

Method Detail

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 interface CompilerPass

Parameters:

externs - Top of external JS tree

root - Top of JS tree

visit

public void visit(NodeTraversal traversal,
                  Node node,
                  Node unused)

Description copied from interface: NodeTraversal.Callback

Visits a node in postorder (after its children). A node is visited in postorder iff NodeTraversal.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 interface NodeTraversal.Callback

Parameters:

traversal - The current traversal.

node - The current node.

unused - The parent of the current node.

processJsMessage

protected abstract void processJsMessage(JsMessage message,
                                         JsMessageDefinition definition)

Processes found JS message. Several examples of "standard" processing routines are:

1. extract all JS messages
2. replace JS messages with localized versions for some specific language
3. check that messages have correct syntax and present in localization bundle

Parameters:

message - the found message

definition - the definition of the object and usually contains all additional message information like message node/parent's node

checkNode

protected void checkNode(@Nullable
                         Node node,
                         Token type)
                  throws com.google.javascript.jscomp.JsMessageVisitor.MalformedException

Checks a node's type.

Throws:

com.google.javascript.jscomp.JsMessageVisitor.MalformedException - if the node is null or the wrong type