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Closure Compiler is a JavaScript optimizing compiler. It parses your JavaScript, analyzes it, removes dead code and rewrites and minimizes what's left. It also checks syntax, variable references, and types, and warns about common JavaScript pitfalls. It is used in many of Google's JavaScript apps, including Gmail, Google Web Search, Google Maps, and Google Docs.

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/*
 * Copyright 2008 The Closure Compiler Authors.
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

package com.google.javascript.jscomp;

import com.google.common.collect.ImmutableMap;
import com.google.javascript.rhino.Node;
import org.jspecify.nullness.Nullable;

/**
 * Container class that holds a {@link JsMessage} and information about the {@code goog.getMsg()}
 * call it was built from.
 */
public interface JsMessageDefinition {

  /** The JsMessage object built from the `goog.getMsg()` call. */
  JsMessage getMessage();

  /**
   * The RHS node of the message assignment statement.
   *
   * e.g. The goog.getMsg() call in:
   *
   * 

   *   const MSG_HELLO =
   *       goog.getMsg(
   *           'Hello, {$name}.',
   *           { 'name', getName() },
   *           { unescapeHtmlEntities: true });
   * 
   */
  Node getMessageNode();

  /**
   * The Node representing the message text template.
   *
   * This node may be a literal string or a concatenation of literal strings.
   *
   * 
For a {@code goog.getMsg()} call this is the first argument.
   */
  Node getTemplateTextNode();

  /**
   * The object literal {@link Node} that maps placeholder names to expressions providing their
   * values.
   *
   * 
This value will be {@code null} if the message definition didn't specify placeholder values.
   */
  @Nullable Node getPlaceholderValuesNode();

  /**
   * A map from placehlolder name to the Node assigned to it in the values map argument of
   * `goog.getMsg()`.
   *
   * 
This will be an empty map if there was no object or it was an empty object literal.
   */
  ImmutableMap getPlaceholderValueMap();

  /**
   * The value of the 'html' options key in the options bag argument.
   *
   * 
This value will be false if there was no options bag argument, or if it didn't
   * contain an 'html' property.
   */
  boolean shouldEscapeLessThan();

  /**
   * The value of the 'unescapeHtmlEntities' options key in the options bag argument.
   *
   * This value will be false if there was no options bag argument, or if it didn't
   * contain an 'unescapeHtmlEntities' property.
   */
  boolean shouldUnescapeHtmlEntities();
}