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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 2009 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.annotations.GwtIncompatible;
import com.google.javascript.jscomp.NodeTraversal.AbstractPostOrderCallback;
import com.google.javascript.rhino.Node;
import java.util.regex.Matcher;
import java.util.regex.Pattern;

/**
 * Ensures string literals matching certain patterns are only used as
 * goog.getCssName parameters.
 *
 * @author [email protected] (Martin Kretzschmar)
 */
@GwtIncompatible("java.util.regex")
class CheckMissingGetCssName
    extends AbstractPostOrderCallback implements CompilerPass {
  private final AbstractCompiler compiler;
  private final CheckLevel level;
  private final Matcher blacklist;

  static final String GET_CSS_NAME_FUNCTION = "goog.getCssName";
  static final String GET_UNIQUE_ID_FUNCTION = ".getUniqueId";

  static final DiagnosticType MISSING_GETCSSNAME =
      DiagnosticType.disabled(
          "JSC_MISSING_GETCSSNAME",
          "missing goog.getCssName around literal ''{0}''");

  CheckMissingGetCssName(AbstractCompiler compiler, CheckLevel level,
      String blacklistRegex) {
    this.compiler = compiler;
    this.level = level;
    this.blacklist =
        Pattern.compile("\\b(?:" + blacklistRegex + ")").matcher("");
  }

  @Override
  public void process(Node externs, Node root) {
    NodeTraversal.traverse(compiler, root, this);
  }

  @Override
  public void visit(NodeTraversal unused, Node n, Node parent) {
    if ((n.isString() || n.isTemplateLitString()) && !parent.isGetProp() && !parent.isRegExp()) {
      String s = n.isString() ? n.getString() : n.getCookedString();

      for (blacklist.reset(s); blacklist.find();) {
        if (parent.isTemplateLit()) {
          if (parent.hasMoreThanOneChild()) {
            // Ignore template string with substitutions
            continue;
          } else {
            n = parent;
          }
        }
        if (insideGetCssNameCall(n)) {
          continue;
        }
        if (insideGetUniqueIdCall(n)) {
          continue;
        }
        if (insideAssignmentToIdConstant(n)) {
          continue;
        }
        compiler.report(JSError.make(n, level, MISSING_GETCSSNAME, blacklist.group()));
      }
    }
  }

  /** Returns whether the node is an argument of a goog.getCssName call. */
  private static boolean insideGetCssNameCall(Node n) {
    Node parent = n.getParent();
    return parent.isCall() &&
        parent.getFirstChild().matchesQualifiedName(GET_CSS_NAME_FUNCTION);
  }

  /**
   * Returns whether the node is an argument of a function that returns
   * a unique id (the last part of the qualified name matches
   * GET_UNIQUE_ID_FUNCTION).
   */
  private static boolean insideGetUniqueIdCall(Node n) {
    Node parent = n.getParent();
    String name = parent.isCall() ?
        parent.getFirstChild().getQualifiedName() : null;

    return name != null && name.endsWith(GET_UNIQUE_ID_FUNCTION);
  }

  /**
   * Returns whether the node is the right hand side of an assignment or
   * initialization of a variable named *_ID of *_ID_.
   */
  private boolean insideAssignmentToIdConstant(Node n) {
    Node parent = n.getParent();
    if (parent.isAssign()) {
      String qname = parent.getFirstChild().getQualifiedName();
      return qname != null && isIdName(qname);
    } else if (parent.isName()) {
      Node grandParent = parent.getParent();
      if (grandParent != null && NodeUtil.isNameDeclaration(grandParent)) {
        String name = parent.getString();
        return isIdName(name);
      } else {
        return false;
      }
    } else {
      return false;
    }
  }

  private static boolean isIdName(String name) {
    return name.endsWith("ID") || name.endsWith("ID_");
  }
}