Review

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com/google/javascript/jscomp/ReplaceMessages.java

updateFunctionNode(JsMessage, Node)

class ReplaceMessages {
  /**
   * Updates the descendants of a FUNCTION node to represent a message's value.
   * <p>
   * The tree looks something like:
   * <pre>
   * function
   *  |-- name
   *  |-- lp
   *  |   |-- name <arg1>
   *  |    -- name <arg2>
   *   -- block
   *      |
   *       --return
   *           |
   *            --add
   *               |-- string foo
   *                -- name <arg1>
   * </pre>
   *
   * @param message  a message
   * @param functionNode  the message's original FUNCTION value node
   *
   * @throws MalformedException if the passed node's subtree structure is
   *         not as expected
   */
  private void updateFunctionNode(JsMessage message, Node functionNode)
      throws MalformedException {
    checkNode(functionNode, Token.FUNCTION);
    Node nameNode = functionNode.getFirstChild();
    checkNode(nameNode, Token.NAME);
    Node argListNode = nameNode.getNext();
    checkNode(argListNode, Token.LP);
    Node oldBlockNode = argListNode.getNext();
    checkNode(oldBlockNode, Token.BLOCK);

    Iterator<CharSequence> iterator = message.parts().iterator();
    Node valueNode = iterator.hasNext()
        ? constructAddOrStringNode(iterator, argListNode)
        : Node.newString("");
    Node newBlockNode = new Node(Token.BLOCK,
        new Node(Token.RETURN, valueNode));

    functionNode.replaceChild(oldBlockNode, newBlockNode);
  }

}