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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 2016 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.ImmutableList;
import com.google.common.collect.ImmutableSet;
import com.google.javascript.jscomp.NodeTraversal.ExternsSkippingCallback;
import com.google.javascript.jscomp.PolymerPass.MemberDefinition;
import com.google.javascript.rhino.JSDocInfo;
import com.google.javascript.rhino.Node;

/**
 * For every Polymer Behavior, strip property type annotations and add suppress checktypes on
 * functions.
 */
final class PolymerPassSuppressBehaviors extends ExternsSkippingCallback {

  private final AbstractCompiler compiler;

  PolymerPassSuppressBehaviors(AbstractCompiler compiler) {
    this.compiler = compiler;
  }

  @Override
  public void visit(NodeTraversal t, Node n, Node parent) {
    if (isBehavior(n)) {
      if (!NodeUtil.isNameDeclaration(n) && !n.isAssign()) {
        compiler.report(JSError.make(n, PolymerPassErrors.POLYMER_UNQUALIFIED_BEHAVIOR));
        return;
      }

      // Add @nocollapse.
      JSDocInfo.Builder newDocs = JSDocInfo.Builder.maybeCopyFrom(n.getJSDocInfo());
      newDocs.recordNoCollapse();
      n.setJSDocInfo(newDocs.build());

      Node behaviorValue = n.getSecondChild();
      if (NodeUtil.isNameDeclaration(n)) {
        behaviorValue = n.getFirstFirstChild();
      }
      suppressBehavior(behaviorValue, n);
    }
  }

  /** Strip property type annotations and add suppressions on functions. */
  private void suppressBehavior(Node behaviorValue, Node reportNode) {
    if (behaviorValue == null) {
      compiler.report(JSError.make(reportNode, PolymerPassErrors.POLYMER_UNQUALIFIED_BEHAVIOR));
      return;
    }

    if (behaviorValue.isArrayLit()) {
      for (Node child = behaviorValue.getFirstChild(); child != null; child = child.getNext()) {
        suppressBehavior(child, behaviorValue);
      }
    } else if (behaviorValue.isObjectLit()) {
      stripPropertyTypes(behaviorValue);
      addBehaviorSuppressions(behaviorValue);
    }
  }

  /**
   * @return Whether the node is the declaration of a Behavior.
   */
  private static boolean isBehavior(Node value) {
    return value.getJSDocInfo() != null && value.getJSDocInfo().isPolymerBehavior();
  }

  private void stripPropertyTypes(Node behaviorValue) {
    ImmutableList properties =
        PolymerPassStaticUtils.extractProperties(
            behaviorValue,
            PolymerClassDefinition.DefinitionType.ObjectLiteral,
            compiler,
            /* constructor= */ null);
    for (MemberDefinition property : properties) {
      property.name.setJSDocInfo(null);
    }
  }

  private void suppressDefaultValues(Node behaviorValue) {
    for (MemberDefinition property :
        PolymerPassStaticUtils.extractProperties(
            behaviorValue,
            PolymerClassDefinition.DefinitionType.ObjectLiteral,
            compiler,
            /* constructor= */ null)) {
      if (!property.value.isObjectLit()) {
        continue;
      }

      Node defaultValue = NodeUtil.getFirstPropMatchingKey(property.value, "value");
      if (defaultValue == null || !defaultValue.isFunction()) {
        continue;
      }
      Node defaultValueKey = defaultValue.getParent();
      JSDocInfo.Builder suppressDoc =
          JSDocInfo.Builder.maybeCopyFrom(defaultValueKey.getJSDocInfo());
      suppressDoc.recordSuppressions(ImmutableSet.of("checkTypes", "globalThis", "visibility"));
      defaultValueKey.setJSDocInfo(suppressDoc.build());
    }
  }

  private void addBehaviorSuppressions(Node behaviorValue) {
    for (Node keyNode = behaviorValue.getFirstChild();
        keyNode != null;
        keyNode = keyNode.getNext()) {
      if (keyNode.getFirstChild().isFunction()) {
        keyNode.setJSDocInfo(null);
        JSDocInfo.Builder suppressDoc = JSDocInfo.builder().parseDocumentation();
        suppressDoc.recordSuppressions(ImmutableSet.of("checkTypes", "globalThis", "visibility"));
        keyNode.setJSDocInfo(suppressDoc.build());
      }
    }
    suppressDefaultValues(behaviorValue);
  }
}