From a6cb23b02a1c184176313c2f662bc30078e8b9c3 Mon Sep 17 00:00:00 2001
From: Yuriy Artamonov <artamonov@haulmont.com>
Date: Fri, 1 Mar 2013 10:30:56 +0000
Subject: [PATCH] Handle History back step in browser #PL-1897

---
 .../toolkit/gwt/client/utils/VScriptHost.java | 57 ++++++++++++++++++-
 .../gwt/client/ApplicationConfiguration.java  | 16 +++++-
 .../src/com/haulmont/cuba/web/AppWindow.java  | 10 +++-
 .../src/com/haulmont/cuba/web/WebConfig.java  |  7 +++
 .../cuba/web/sys/CubaApplicationServlet.java  | 40 ++++++++++---
 .../cuba/web/toolkit/ui/JavaScriptHost.java   | 28 ++++++++-
 .../web/VAADIN/resources/js/jquery.history.js |  1 +
 modules/web/web/VAADIN/resources/js/json2.js  |  1 +
 8 files changed, 143 insertions(+), 17 deletions(-)
 create mode 100644 modules/web/web/VAADIN/resources/js/jquery.history.js
 create mode 100644 modules/web/web/VAADIN/resources/js/json2.js

diff --git a/modules/web-toolkit/src/com/haulmont/cuba/toolkit/gwt/client/utils/VScriptHost.java b/modules/web-toolkit/src/com/haulmont/cuba/toolkit/gwt/client/utils/VScriptHost.java
index d8fcfba55b..a717b984a2 100644
--- a/modules/web-toolkit/src/com/haulmont/cuba/toolkit/gwt/client/utils/VScriptHost.java
+++ b/modules/web-toolkit/src/com/haulmont/cuba/toolkit/gwt/client/utils/VScriptHost.java
@@ -15,9 +15,9 @@ import com.vaadin.terminal.gwt.client.ValueMap;
 
 /**
  * Component for evaluate custom JavaScript from server
- * <p>$Id$</p>
  *
  * @author artamonov
+ * @version $Id$
  */
 public class VScriptHost extends SimplePanel implements Paintable {
     public static final String COMMAND_PARAM_KEY = "command";
@@ -34,13 +34,28 @@ public class VScriptHost extends SimplePanel implements Paintable {
     public static final String URL_PARAM_KEY = "url";
     public static final String LOCALE_PARAM_KEY = "messages";
 
+    public static final String HISTORY_BACK_ACTION = "historyBackAction";
+
+    private boolean historyHandlerInitialized = false;
+
+    private ApplicationConnection client;
+    private String paintableId;
+
     public VScriptHost() {
         getElement().getStyle().setDisplay(Style.Display.NONE);
         getElement().getStyle().setVisibility(Style.Visibility.HIDDEN);
     }
 
+    @Override
     public void updateFromUIDL(UIDL uidl, ApplicationConnection client) {
-        String paintableId = uidl.getId();
+        this.client = client;
+        this.paintableId = uidl.getId();
+
+        if (client.getConfiguration().isHandleHistoryBack() && !historyHandlerInitialized) {
+            initHistoryHandler();
+
+            historyHandlerInitialized = true;
+        }
 
         this.getElement().setId("scriptHost_" + paintableId);
 
@@ -66,6 +81,12 @@ public class VScriptHost extends SimplePanel implements Paintable {
         }
     }
 
+    public void handleHistoryBackAction() {
+        if (historyHandlerInitialized) {
+            client.updateVariable(paintableId, HISTORY_BACK_ACTION, "performed", true);
+        }
+    }
+
     private native void evaluateScript(String script)/*-{
         eval(script);
     }-*/;
@@ -80,4 +101,34 @@ public class VScriptHost extends SimplePanel implements Paintable {
         };
         setTimeout(timedAction, 50);
     }-*/;
-}
+
+    private native void initHistoryHandler()
+    /*-{
+        var vScriptHost = this;
+        (function(window){
+            var History = window.History;
+
+            var location = window.location.href;
+
+            var defaultState = 0;
+
+            if (location.indexOf('?wv') >= 0) {
+                History.pushState({state: 1, rand: 1}, window.document.title, '?vw');
+                defaultState = 1;
+            } else {
+                History.pushState({state: 2, rand: 2}, window.document.title, '?wv');
+                defaultState = 2;
+            }
+
+            History.Adapter.bind(window, 'statechange', function () {
+                var State = History.getState();
+
+                if (!State.data || State.data.state != defaultState) {
+                    History.go(1);
+
+                    vScriptHost.@com.haulmont.cuba.toolkit.gwt.client.utils.VScriptHost::handleHistoryBackAction()();
+                }
+            });
+        })($wnd);
+    }-*/;
+}
\ No newline at end of file
diff --git a/modules/web-toolkit/src/com/vaadin/terminal/gwt/client/ApplicationConfiguration.java b/modules/web-toolkit/src/com/vaadin/terminal/gwt/client/ApplicationConfiguration.java
index 90224a1f18..4a2944b70d 100644
--- a/modules/web-toolkit/src/com/vaadin/terminal/gwt/client/ApplicationConfiguration.java
+++ b/modules/web-toolkit/src/com/vaadin/terminal/gwt/client/ApplicationConfiguration.java
@@ -63,6 +63,8 @@ public class ApplicationConfiguration implements EntryPoint {
     private String blockUiMessage = "Please wait";
     private boolean useUiBlocking = false;
 
+    private boolean handleHistoryBack = false;
+
     private String requiredWidgetset;
     private boolean useDebugIdInDom = true;
     private boolean usePortletURLs = false;
@@ -123,7 +125,7 @@ public class ApplicationConfiguration implements EntryPoint {
      */
     public void updateSystemMessages(ValueMap localeMessages) {
         if (!localeMessages.getKeySet().isEmpty()) {
-            // Update all system messages
+            // Update all system messages                                                   handleHistoryBack
             communicationErrorCaption = localeMessages.getString("communicationErrorCaption");
             communicationErrorMessage = localeMessages.getString("communicationErrorMessage");
 
@@ -190,6 +192,14 @@ public class ApplicationConfiguration implements EntryPoint {
         return useUiBlocking;
     }
 
+    public boolean isHandleHistoryBack() {
+        return handleHistoryBack;
+    }
+
+    public void setHandleHistoryBack(boolean handleHistoryBack) {
+        this.handleHistoryBack = handleHistoryBack;
+    }
+
     private native void loadFromDOM()
     /*-{
 
@@ -203,6 +213,7 @@ public class ApplicationConfiguration implements EntryPoint {
             this.@com.vaadin.terminal.gwt.client.ApplicationConfiguration::appUri = uri;
             this.@com.vaadin.terminal.gwt.client.ApplicationConfiguration::themeUri = jsobj.themeUri;
             this.@com.vaadin.terminal.gwt.client.ApplicationConfiguration::sessionId = jsobj.sessionId;
+
             if(jsobj.windowName) {
                 this.@com.vaadin.terminal.gwt.client.ApplicationConfiguration::windowName = jsobj.windowName;
             }
@@ -226,6 +237,9 @@ public class ApplicationConfiguration implements EntryPoint {
                 this.@com.vaadin.terminal.gwt.client.ApplicationConfiguration::useUiBlocking = jsobj.uiBlocking.useUiBlocking;
                 this.@com.vaadin.terminal.gwt.client.ApplicationConfiguration::blockUiMessage = jsobj.uiBlocking.blockUiMessage;
             }
+            if (jsobj.handleHistoryBack) {
+                this.@com.vaadin.terminal.gwt.client.ApplicationConfiguration::handleHistoryBack = jsobj.handleHistoryBack;
+            }
             if (jsobj.usePortletURLs) {
                 this.@com.vaadin.terminal.gwt.client.ApplicationConfiguration::usePortletURLs = jsobj.usePortletURLs;
             }
diff --git a/modules/web/src/com/haulmont/cuba/web/AppWindow.java b/modules/web/src/com/haulmont/cuba/web/AppWindow.java
index 8620e87847..6a65090121 100644
--- a/modules/web/src/com/haulmont/cuba/web/AppWindow.java
+++ b/modules/web/src/com/haulmont/cuba/web/AppWindow.java
@@ -51,7 +51,7 @@ import java.util.*;
  * @version $Id$
  */
 @SuppressWarnings("unused")
-public class AppWindow extends Window implements UserSubstitutionListener {
+public class AppWindow extends Window implements UserSubstitutionListener, JavaScriptHost.HistoryBackHandler {
 
     private static final long serialVersionUID = 7269808125566032433L;
 
@@ -165,9 +165,17 @@ public class AppWindow extends Window implements UserSubstitutionListener {
 
     private void initStaticComponents() {
         scriptHost = new JavaScriptHost();
+        if (webConfig.getAllowHandleBrowserHistoryBack()) {
+            scriptHost.setHistoryBackHandler(this);
+        }
         addComponent(scriptHost);
     }
 
+    @Override
+    public void onHistoryBackPerformed() {
+        showNotification("Go back to the Future!", Notification.TYPE_HUMANIZED_MESSAGE);
+    }
+
     /**
      * @return Current mode
      */
diff --git a/modules/web/src/com/haulmont/cuba/web/WebConfig.java b/modules/web/src/com/haulmont/cuba/web/WebConfig.java
index 7d56b0b223..061c1e1a41 100644
--- a/modules/web/src/com/haulmont/cuba/web/WebConfig.java
+++ b/modules/web/src/com/haulmont/cuba/web/WebConfig.java
@@ -217,6 +217,13 @@ public interface WebConfig extends Config {
     @DefaultBoolean(true)
     boolean getUseUiBlocking();
 
+    /**
+     * @return Whether to handle back button click in browser on server-side.
+     */
+    @Property("cuba.web.getAllowHandleBrowserHistoryBack")
+    @DefaultBoolean(true)
+    boolean getAllowHandleBrowserHistoryBack();
+
     /**
      * @return Theme
      */
diff --git a/modules/web/src/com/haulmont/cuba/web/sys/CubaApplicationServlet.java b/modules/web/src/com/haulmont/cuba/web/sys/CubaApplicationServlet.java
index a6660526ca..d7132ea4f9 100644
--- a/modules/web/src/com/haulmont/cuba/web/sys/CubaApplicationServlet.java
+++ b/modules/web/src/com/haulmont/cuba/web/sys/CubaApplicationServlet.java
@@ -2,16 +2,12 @@
  * Copyright (c) 2008 Haulmont Technology Ltd. All Rights Reserved.
  * Haulmont Technology proprietary and confidential.
  * Use is subject to license terms.
-
- * Author: Nikolay Gorodnov
- * Created: 27.08.2009 18:39:09
- *
- * $Id$
  */
 package com.haulmont.cuba.web.sys;
 
 import com.haulmont.cuba.core.app.ServerInfoService;
-import com.haulmont.cuba.core.global.ConfigProvider;
+import com.haulmont.cuba.core.global.AppBeans;
+import com.haulmont.cuba.core.global.Configuration;
 import com.haulmont.cuba.core.global.GlobalConfig;
 import com.haulmont.cuba.gui.ServiceLocator;
 import com.haulmont.cuba.web.App;
@@ -25,6 +21,7 @@ import org.apache.commons.lang.BooleanUtils;
 import org.apache.commons.logging.Log;
 import org.apache.commons.logging.LogFactory;
 
+import javax.servlet.ServletConfig;
 import javax.servlet.ServletException;
 import javax.servlet.http.Cookie;
 import javax.servlet.http.HttpServletRequest;
@@ -38,6 +35,10 @@ import java.util.HashMap;
 import java.util.Map;
 import java.util.regex.Matcher;
 
+/**
+ * @author gorodnov
+ * @version $Id$
+ */
 public class CubaApplicationServlet extends ApplicationServlet {
     private static final long serialVersionUID = -8701539520754293569L;
 
@@ -45,9 +46,13 @@ public class CubaApplicationServlet extends ApplicationServlet {
 
     private Log log = LogFactory.getLog(CubaApplicationServlet.class);
 
+    private WebConfig webConfig;
+
+    private GlobalConfig globalConfig;
+
     @Override
     protected boolean isTestingMode() {
-        return ConfigProvider.getConfig(GlobalConfig.class).getTestMode();
+        return globalConfig.getTestMode();
     }
 
     @Override
@@ -55,6 +60,15 @@ public class CubaApplicationServlet extends ApplicationServlet {
         return CubaApplicationContext.getApplicationContext(session);
     }
 
+    @Override
+    public void init(ServletConfig servletConfig) throws ServletException {
+        super.init(servletConfig);
+
+        Configuration configuration = AppBeans.get(Configuration.class);
+        webConfig = configuration.getConfig(WebConfig.class);
+        globalConfig = configuration.getConfig(GlobalConfig.class);
+    }
+
     @Override
     protected void service(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
         String requestURI = request.getRequestURI();
@@ -249,7 +263,9 @@ public class CubaApplicationServlet extends ApplicationServlet {
             page.write("useDebugIdInDom: true,\n");
         }
 
-        WebConfig webConfig = ConfigProvider.getConfig(WebConfig.class);
+        if (webConfig.getAllowHandleBrowserHistoryBack())
+            page.write("handleHistoryBack: true,\n");
+
         page.write("\n\"uiBlocking\" : {");
         page.write(" \"blockUiMessage\" : \"" + systemMessages.getUiBlockingMessage() + "\" ,");
         page.write(" \"useUiBlocking\" : " +
@@ -296,7 +312,7 @@ public class CubaApplicationServlet extends ApplicationServlet {
     protected void writeAjaxPageHtmlHeader(HttpServletRequest request, BufferedWriter page, String title,
                                            String themeUri) throws IOException {
         page.write("<meta http-equiv=\"Content-Type\" content=\"text/html; charset=utf-8\"/>\n");
-        if (ConfigProvider.getConfig(WebConfig.class).getUseChromeFramePlugin()
+        if (webConfig.getUseChromeFramePlugin()
                 && Browser.getBrowserInfo(request).isChromeFrame()) {
             page.write("<meta http-equiv=\"X-UA-Compatible\" content=\"chrome=1\" />\n");
 /*
@@ -319,6 +335,12 @@ public class CubaApplicationServlet extends ApplicationServlet {
         writeScriptResource(request, page, "jquery-1.4.2.min.js", false);
         writeScriptResource(request, page, "jquery.blockUI.js", false);
         writeScriptResource(request, page, "scripts.js", true);
+
+        // history control
+        if (webConfig.getAllowHandleBrowserHistoryBack()) {
+            writeScriptResource(request, page, "jquery.history.js", false);
+            writeScriptResource(request, page, "json2.js", false);
+        }
     }
 
     private void writeScriptResource(HttpServletRequest request, BufferedWriter page, String fileName, boolean nocache) throws IOException {
diff --git a/modules/web/src/com/haulmont/cuba/web/toolkit/ui/JavaScriptHost.java b/modules/web/src/com/haulmont/cuba/web/toolkit/ui/JavaScriptHost.java
index 638ccf947f..7c17c25e14 100644
--- a/modules/web/src/com/haulmont/cuba/web/toolkit/ui/JavaScriptHost.java
+++ b/modules/web/src/com/haulmont/cuba/web/toolkit/ui/JavaScriptHost.java
@@ -19,9 +19,9 @@ import java.util.Set;
 
 /**
  * Component for evaluate custom JavaScript from server
- * <p>$Id$</p>
  *
  * @author artamonov
+ * @version $Id$
  */
 @ClientWidget(VScriptHost.class)
 public class JavaScriptHost extends AbstractComponent {
@@ -29,12 +29,14 @@ public class JavaScriptHost extends AbstractComponent {
 
     private static class ScriptValueProvider implements ValueProvider {
 
-        Map<String, Object> params = new HashMap<String, Object>();
+        Map<String, Object> params = new HashMap<>();
 
+        @Override
         public Map<String, Object> getValues() {
             return params;
         }
 
+        @Override
         public Map<String, Object> getParameters() {
             return params;
         }
@@ -54,7 +56,15 @@ public class JavaScriptHost extends AbstractComponent {
 
     private ScriptValueProvider valueProvider = new ScriptValueProvider();
 
-    public JavaScriptHost() {
+    private HistoryBackHandler historyBackHandler = null;
+
+    @Override
+    public void changeVariables(Object source, Map<String, Object> variables) {
+        super.changeVariables(source, variables);
+
+        if (variables.containsKey(VScriptHost.HISTORY_BACK_ACTION) && historyBackHandler != null) {
+            historyBackHandler.onHistoryBackPerformed();
+        }
     }
 
     @Override
@@ -114,4 +124,16 @@ public class JavaScriptHost extends AbstractComponent {
         valueProvider.removeParam(VScriptHost.SCRIPT_PARAM_KEY);
         valueProvider.removeParam(VScriptHost.COMMAND_PARAM_KEY);
     }
+
+    public HistoryBackHandler getHistoryBackHandler() {
+        return historyBackHandler;
+    }
+
+    public void setHistoryBackHandler(HistoryBackHandler historyBackHandler) {
+        this.historyBackHandler = historyBackHandler;
+    }
+
+    public interface HistoryBackHandler {
+        void onHistoryBackPerformed();
+    }
 }
\ No newline at end of file
diff --git a/modules/web/web/VAADIN/resources/js/jquery.history.js b/modules/web/web/VAADIN/resources/js/jquery.history.js
new file mode 100644
index 0000000000..8d4edcd210
--- /dev/null
+++ b/modules/web/web/VAADIN/resources/js/jquery.history.js
@@ -0,0 +1 @@
+window.JSON||(window.JSON={}),function(){function f(a){return a<10?"0"+a:a}function quote(a){return escapable.lastIndex=0,escapable.test(a)?'"'+a.replace(escapable,function(a){var b=meta[a];return typeof b=="string"?b:"\\u"+("0000"+a.charCodeAt(0).toString(16)).slice(-4)})+'"':'"'+a+'"'}function str(a,b){var c,d,e,f,g=gap,h,i=b[a];i&&typeof i=="object"&&typeof i.toJSON=="function"&&(i=i.toJSON(a)),typeof rep=="function"&&(i=rep.call(b,a,i));switch(typeof i){case"string":return quote(i);case"number":return isFinite(i)?String(i):"null";case"boolean":case"null":return String(i);case"object":if(!i)return"null";gap+=indent,h=[];if(Object.prototype.toString.apply(i)==="[object Array]"){f=i.length;for(c=0;c<f;c+=1)h[c]=str(c,i)||"null";return e=h.length===0?"[]":gap?"[\n"+gap+h.join(",\n"+gap)+"\n"+g+"]":"["+h.join(",")+"]",gap=g,e}if(rep&&typeof rep=="object"){f=rep.length;for(c=0;c<f;c+=1)d=rep[c],typeof d=="string"&&(e=str(d,i),e&&h.push(quote(d)+(gap?": ":":")+e))}else for(d in i)Object.hasOwnProperty.call(i,d)&&(e=str(d,i),e&&h.push(quote(d)+(gap?": ":":")+e));return e=h.length===0?"{}":gap?"{\n"+gap+h.join(",\n"+gap)+"\n"+g+"}":"{"+h.join(",")+"}",gap=g,e}}"use strict",typeof Date.prototype.toJSON!="function"&&(Date.prototype.toJSON=function(a){return isFinite(this.valueOf())?this.getUTCFullYear()+"-"+f(this.getUTCMonth()+1)+"-"+f(this.getUTCDate())+"T"+f(this.getUTCHours())+":"+f(this.getUTCMinutes())+":"+f(this.getUTCSeconds())+"Z":null},String.prototype.toJSON=Number.prototype.toJSON=Boolean.prototype.toJSON=function(a){return this.valueOf()});var JSON=window.JSON,cx=/[\u0000\u00ad\u0600-\u0604\u070f\u17b4\u17b5\u200c-\u200f\u2028-\u202f\u2060-\u206f\ufeff\ufff0-\uffff]/g,escapable=/[\\\"\x00-\x1f\x7f-\x9f\u00ad\u0600-\u0604\u070f\u17b4\u17b5\u200c-\u200f\u2028-\u202f\u2060-\u206f\ufeff\ufff0-\uffff]/g,gap,indent,meta={"\b":"\\b","\t":"\\t","\n":"\\n","\f":"\\f","\r":"\\r",'"':'\\"',"\\":"\\\\"},rep;typeof JSON.stringify!="function"&&(JSON.stringify=function(a,b,c){var d;gap="",indent="";if(typeof c=="number")for(d=0;d<c;d+=1)indent+=" ";else typeof c=="string"&&(indent=c);rep=b;if(!b||typeof b=="function"||typeof b=="object"&&typeof b.length=="number")return str("",{"":a});throw new Error("JSON.stringify")}),typeof JSON.parse!="function"&&(JSON.parse=function(text,reviver){function walk(a,b){var c,d,e=a[b];if(e&&typeof e=="object")for(c in e)Object.hasOwnProperty.call(e,c)&&(d=walk(e,c),d!==undefined?e[c]=d:delete e[c]);return reviver.call(a,b,e)}var j;text=String(text),cx.lastIndex=0,cx.test(text)&&(text=text.replace(cx,function(a){return"\\u"+("0000"+a.charCodeAt(0).toString(16)).slice(-4)}));if(/^[\],:{}\s]*$/.test(text.replace(/\\(?:["\\\/bfnrt]|u[0-9a-fA-F]{4})/g,"@").replace(/"[^"\\\n\r]*"|true|false|null|-?\d+(?:\.\d*)?(?:[eE][+\-]?\d+)?/g,"]").replace(/(?:^|:|,)(?:\s*\[)+/g,"")))return j=eval("("+text+")"),typeof reviver=="function"?walk({"":j},""):j;throw new SyntaxError("JSON.parse")})}(),function(a,b){"use strict";var c=a.History=a.History||{},d=a.jQuery;if(typeof c.Adapter!="undefined")throw new Error("History.js Adapter has already been loaded...");c.Adapter={bind:function(a,b,c){d(a).bind(b,c)},trigger:function(a,b,c){d(a).trigger(b,c)},extractEventData:function(a,c,d){var e=c&&c.originalEvent&&c.originalEvent[a]||d&&d[a]||b;return e},onDomLoad:function(a){d(a)}},typeof c.init!="undefined"&&c.init()}(window),function(a,b){"use strict";var c=a.document,d=a.setTimeout||d,e=a.clearTimeout||e,f=a.setInterval||f,g=a.History=a.History||{};if(typeof g.initHtml4!="undefined")throw new Error("History.js HTML4 Support has already been loaded...");g.initHtml4=function(){if(typeof g.initHtml4.initialized!="undefined")return!1;g.initHtml4.initialized=!0,g.enabled=!0,g.savedHashes=[],g.isLastHash=function(a){var b=g.getHashByIndex(),c;return c=a===b,c},g.saveHash=function(a){return g.isLastHash(a)?!1:(g.savedHashes.push(a),!0)},g.getHashByIndex=function(a){var b=null;return typeof a=="undefined"?b=g.savedHashes[g.savedHashes.length-1]:a<0?b=g.savedHashes[g.savedHashes.length+a]:b=g.savedHashes[a],b},g.discardedHashes={},g.discardedStates={},g.discardState=function(a,b,c){var d=g.getHashByState(a),e;return e={discardedState:a,backState:c,forwardState:b},g.discardedStates[d]=e,!0},g.discardHash=function(a,b,c){var d={discardedHash:a,backState:c,forwardState:b};return g.discardedHashes[a]=d,!0},g.discardedState=function(a){var b=g.getHashByState(a),c;return c=g.discardedStates[b]||!1,c},g.discardedHash=function(a){var b=g.discardedHashes[a]||!1;return b},g.recycleState=function(a){var b=g.getHashByState(a);return g.discardedState(a)&&delete g.discardedStates[b],!0},g.emulated.hashChange&&(g.hashChangeInit=function(){g.checkerFunction=null;var b="",d,e,h,i;return 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\ No newline at end of file
diff --git a/modules/web/web/VAADIN/resources/js/json2.js b/modules/web/web/VAADIN/resources/js/json2.js
new file mode 100644
index 0000000000..8ae5a75703
--- /dev/null
+++ b/modules/web/web/VAADIN/resources/js/json2.js
@@ -0,0 +1 @@
+window.JSON||(window.JSON={}),function(){function f(a){return a<10?"0"+a:a}function quote(a){return escapable.lastIndex=0,escapable.test(a)?'"'+a.replace(escapable,function(a){var b=meta[a];return typeof b=="string"?b:"\\u"+("0000"+a.charCodeAt(0).toString(16)).slice(-4)})+'"':'"'+a+'"'}function str(a,b){var c,d,e,f,g=gap,h,i=b[a];i&&typeof i=="object"&&typeof i.toJSON=="function"&&(i=i.toJSON(a)),typeof rep=="function"&&(i=rep.call(b,a,i));switch(typeof i){case"string":return quote(i);case"number":return isFinite(i)?String(i):"null";case"boolean":case"null":return String(i);case"object":if(!i)return"null";gap+=indent,h=[];if(Object.prototype.toString.apply(i)==="[object Array]"){f=i.length;for(c=0;c<f;c+=1)h[c]=str(c,i)||"null";return e=h.length===0?"[]":gap?"[\n"+gap+h.join(",\n"+gap)+"\n"+g+"]":"["+h.join(",")+"]",gap=g,e}if(rep&&typeof rep=="object"){f=rep.length;for(c=0;c<f;c+=1)d=rep[c],typeof d=="string"&&(e=str(d,i),e&&h.push(quote(d)+(gap?": ":":")+e))}else for(d in i)Object.hasOwnProperty.call(i,d)&&(e=str(d,i),e&&h.push(quote(d)+(gap?": ":":")+e));return e=h.length===0?"{}":gap?"{\n"+gap+h.join(",\n"+gap)+"\n"+g+"}":"{"+h.join(",")+"}",gap=g,e}}"use strict",typeof Date.prototype.toJSON!="function"&&(Date.prototype.toJSON=function(a){return isFinite(this.valueOf())?this.getUTCFullYear()+"-"+f(this.getUTCMonth()+1)+"-"+f(this.getUTCDate())+"T"+f(this.getUTCHours())+":"+f(this.getUTCMinutes())+":"+f(this.getUTCSeconds())+"Z":null},String.prototype.toJSON=Number.prototype.toJSON=Boolean.prototype.toJSON=function(a){return this.valueOf()});var JSON=window.JSON,cx=/[\u0000\u00ad\u0600-\u0604\u070f\u17b4\u17b5\u200c-\u200f\u2028-\u202f\u2060-\u206f\ufeff\ufff0-\uffff]/g,escapable=/[\\\"\x00-\x1f\x7f-\x9f\u00ad\u0600-\u0604\u070f\u17b4\u17b5\u200c-\u200f\u2028-\u202f\u2060-\u206f\ufeff\ufff0-\uffff]/g,gap,indent,meta={"\b":"\\b","\t":"\\t","\n":"\\n","\f":"\\f","\r":"\\r",'"':'\\"',"\\":"\\\\"},rep;typeof JSON.stringify!="function"&&(JSON.stringify=function(a,b,c){var d;gap="",indent="";if(typeof c=="number")for(d=0;d<c;d+=1)indent+=" ";else typeof c=="string"&&(indent=c);rep=b;if(!b||typeof b=="function"||typeof b=="object"&&typeof b.length=="number")return str("",{"":a});throw new Error("JSON.stringify")}),typeof JSON.parse!="function"&&(JSON.parse=function(text,reviver){function walk(a,b){var c,d,e=a[b];if(e&&typeof e=="object")for(c in e)Object.hasOwnProperty.call(e,c)&&(d=walk(e,c),d!==undefined?e[c]=d:delete e[c]);return reviver.call(a,b,e)}var j;text=String(text),cx.lastIndex=0,cx.test(text)&&(text=text.replace(cx,function(a){return"\\u"+("0000"+a.charCodeAt(0).toString(16)).slice(-4)}));if(/^[\],:{}\s]*$/.test(text.replace(/\\(?:["\\\/bfnrt]|u[0-9a-fA-F]{4})/g,"@").replace(/"[^"\\\n\r]*"|true|false|null|-?\d+(?:\.\d*)?(?:[eE][+\-]?\d+)?/g,"]").replace(/(?:^|:|,)(?:\s*\[)+/g,"")))return j=eval("("+text+")"),typeof reviver=="function"?walk({"":j},""):j;throw new SyntaxError("JSON.parse")})}()
\ No newline at end of file