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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 2017 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.ijs;

import static com.google.common.base.Preconditions.checkNotNull;

import com.google.common.collect.ListMultimap;
import com.google.common.collect.MultimapBuilder;
import com.google.javascript.rhino.Node;
import java.util.HashSet;
import java.util.Set;

/**
 * Class to keep track of what has been seen so far in a given file.
 */
final class FileInfo {
  private final Set providedNamespaces = new HashSet<>();
  private final Set requiredLocalNames = new HashSet<>();
  private final ListMultimap declarations =
      MultimapBuilder.linkedHashKeys().arrayListValues().build();

  void recordNameDeclaration(Node qualifiedNameNode) {
    recordDeclaration(PotentialDeclaration.fromName(qualifiedNameNode));
  }

  void recordMethod(Node functionNode) {
    recordDeclaration(PotentialDeclaration.fromMethod(functionNode));
  }

  void recordStringKeyDeclaration(Node stringKeyNode) {
    recordDeclaration(PotentialDeclaration.fromStringKey(stringKeyNode));
  }

  void recordDefine(Node callNode) {
    recordDeclaration(PotentialDeclaration.fromDefine(callNode));
  }

  void recordAliasDeclaration(Node nameNode) {
    recordDeclaration(PotentialDeclaration.fromAlias(nameNode));
  }

  ListMultimap getDeclarations() {
    return declarations;
  }

  void recordDeclaration(PotentialDeclaration decl) {
    declarations.put(decl.getFullyQualifiedName(), decl);
  }

  void recordImport(String localName) {
    requiredLocalNames.add(localName);
  }

  boolean isNameDeclared(String fullyQualifiedName) {
    return declarations.containsKey(fullyQualifiedName);
  }

  private static boolean containsPrefix(
      String fullyQualifiedName, Iterable prefixNamespaces) {
    for (String prefix : prefixNamespaces) {
      if (fullyQualifiedName.equals(prefix) || fullyQualifiedName.startsWith(prefix + ".")) {
        return true;
      }
    }
    return false;
  }

  boolean isPrefixProvided(String fullyQualifiedName) {
    return containsPrefix(fullyQualifiedName, providedNamespaces);
  }

  boolean isPrefixRequired(String fullyQualifiedName) {
    return containsPrefix(fullyQualifiedName, requiredLocalNames);
  }

  boolean isStrictPrefixDeclared(String fullyQualifiedName) {
    for (String prefix : declarations.keySet()) {
      if (fullyQualifiedName.startsWith(prefix + ".")) {
        return true;
      }
    }
    return false;
  }

  void markProvided(String providedName) {
    checkNotNull(providedName);
    providedNamespaces.add(providedName);
  }
}