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/*
 * Copyright 2010 Google Inc.
 *
 * 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 elemental.js;

import com.google.gwt.core.client.GWT;

import elemental.client.Browser;
import elemental.html.Navigator;
import elemental.js.dom.JsDocument;
import elemental.js.html.JsWindow;

/**
 * JavaScript native implementation of {@link elemental.client.Browser}.
 */
public class JsBrowser {
  /**
   * A {@link Browser.Info} implementation for when the browser is known to be
   * Gecko at compile time.
   */
  @SuppressWarnings("unused")
  private static class InfoWhenKnownGecko extends InfoWhenUnknown {
    @Override
    public boolean isGecko() {
      return true;
    }

    @Override
    public boolean isSupported() {
      return true;
    }

    @Override
    public boolean isWebKit() {
      return false;
    }
  }

  /**
   * A {@link Browser.Info} implementation for when the browser is known to be
   * Unsupported at compile time.
   */
  @SuppressWarnings("unused")
  private static class InfoWhenKnownUnsupported extends InfoWhenUnknown {
    @Override
    public boolean isGecko() {
      return false;
    }

    @Override
    public boolean isSupported() {
      return false;
    }

    @Override
    public boolean isWebKit() {
      return false;
    }
  }

  /**
   * A {@link Browser.Info} implementation for when the browser is known to be
   * WebKit at compile time.
   */
  @SuppressWarnings("unused")
  private static class InfoWhenKnownWebKit extends InfoWhenUnknown {
    @Override
    public boolean isGecko() {
      return false;
    }

    @Override
    public boolean isSupported() {
      return true;
    }

    @Override
    public boolean isWebKit() {
      return true;
    }
  }

  /**
   * A {@link Browser.Info} implementation for when the browser is not known
   * until runtime.
   *
   * 

* Careful Captain! All those static fields are intentional. In order to * ensure good dead stripping of the entire InfoWhen class hierarchy, the * instance returned by {@link JsBrowser#getInfo()} must not be aliased, so it * instead returns a fly-weight instance referencing static fields. *

*/ private static class InfoWhenUnknown implements Browser.Info { private native static double getGeckoVersion(String userAgent) /*-{ var r = / rv\:(\d+\.\d+)/.exec(userAgent); return r ? parseFloat(r[1]) : 0.0; }-*/; private native static String getProduct(Navigator nav) /*-{ return nav.product; }-*/; private native static double getWebKitVersion(String userAgent) /*-{ var r = /WebKit\/(\d+\.\d+)/.exec(userAgent); return r ? parseFloat(r[1]) : 0.0; }-*/; private static boolean browserDetected; private static boolean platformDetected; private static boolean isWebKit; private static boolean isGecko; private static boolean isMac; private static boolean isWindows; private static boolean isLinux; private void ensurePlatformDetected() { if (!platformDetected) { platformDetected = true; final String userAgent = getWindow().getNavigator().getUserAgent(); isWindows = userAgent.indexOf("Win") >= 0; if (isWindows) { return; } isMac = userAgent.indexOf("Mac") >= 0; if (isMac) { return; } isLinux = userAgent.indexOf("Linux") >= 0; } } private void ensureBrowserDetected() { if (!browserDetected) { browserDetected = true; final Navigator nav = getWindow().getNavigator(); final String ua = nav.getUserAgent(); boolean isWebKitBased = ua.indexOf("WebKit") >= 0; if (isWebKitBased) { isWebKit = getWebKitVersion(ua) >= SUPPORTED_WEBKIT_VERSION; return; } assert !isWebKitBased; isGecko = getProduct(nav).equals("Gecko") && getGeckoVersion(ua) >= SUPPORTED_GECKO_VERSION; } } @Override public boolean isGecko() { ensureBrowserDetected(); return isGecko; } @Override public boolean isSupported() { ensureBrowserDetected(); return isGecko || isWebKit; } @Override public boolean isWebKit() { ensureBrowserDetected(); return isWebKit; } @Override public boolean isLinux() { ensurePlatformDetected(); return isLinux; } @Override public boolean isMac() { ensurePlatformDetected(); return isMac; } public boolean isWindows() { ensurePlatformDetected(); return isWindows; } } /** * The minimum version of WebKit that is supported. * * This equates to >= Safari 5.0.2 */ private static final double SUPPORTED_WEBKIT_VERSION = 533.18; /** * The minimum version of Gecko that is supported. * * This equates to >= Firefox 4.0 */ private static final double SUPPORTED_GECKO_VERSION = 2.0; /** * Gets the document within which this script is running. */ public static native JsDocument getDocument() /*-{ return $doc; }-*/; public static Browser.Info getInfo() { return GWT.create(InfoWhenUnknown.class); } /** * Gets the window within which this script is running. */ public static native JsWindow getWindow() /*-{ return $wnd; }-*/; // Non-instantiable. private JsBrowser() { } }




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