Add support for Schema.org/Recipe

java/org/chromium/distiller/DomUtil.java

 // Copyright 2014 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 package org.chromium.distiller;
 
 import com.google.gwt.core.client.JsArray;
 import com.google.gwt.core.client.JsArrayString;
 import com.google.gwt.dom.client.AnchorElement;
 import com.google.gwt.dom.client.Document;
 import com.google.gwt.dom.client.Element;
 import com.google.gwt.dom.client.ImageElement;
 import com.google.gwt.dom.client.Node;
 import com.google.gwt.dom.client.NodeList;
 import com.google.gwt.dom.client.Style;
 import com.google.gwt.dom.client.VideoElement;
 import com.google.gwt.http.client.URL;
+import com.google.gwt.regexp.shared.MatchResult;
+import com.google.gwt.regexp.shared.RegExp;
 
 import java.util.ArrayList;
 import java.util.HashMap;
 import java.util.List;
 import java.util.Map;
 
 public class DomUtil {
     /**
      * GWT does not provide a way to get a list of all attributes that have been explicitly set on a
      * DOM element (only a way to query the value of a particular attribute). In javascript, this
@@ skipping 401 matching lines @@
             public void exit(Node n) {
             }
 
             @Override
             public void skip(Element e) {
             }
         }).walk(root);
         return nodes;
     }
 
+    public static String formatDuration(String duration) {
+        RegExp pattern = RegExp.compile("^P(?:([0-9]+)Y)?" +
+                "(?:([0-9]+)M)?(?:([0-9]+)W)?(?:([0-9]+)D)?" +
+                "(T(?:([0-9]+)H)?(?:([0-9]+)M)?(?:([0-9]+)S)?)?$", "i");
+        MatchResult matchResult = pattern.exec(duration);
+        List<String> result = new ArrayList<>();
+        if (matchResult != null) {
+            if (matchResult.getGroup(1) != null) {
+                result.add(matchResult.getGroup(1) + " year(s)");
+            }
+            if (matchResult.getGroup(2) != null) {
+                result.add(matchResult.getGroup(2) + " month(s)");
+            }
+            if (matchResult.getGroup(3) != null) {
+                result.add(matchResult.getGroup(3) + " week(s)");
+            }
+            if (matchResult.getGroup(4) != null) {
+                result.add(matchResult.getGroup(4) + " day(s)");
+            }
+            if (matchResult.getGroup(6) != null) {
+                result.add(matchResult.getGroup(6) + " hour(s)");
+            }
+            if (matchResult.getGroup(7) != null) {
+                result.add(matchResult.getGroup(7) + " minute(s)");
+            }
+            if (matchResult.getGroup(8) != null) {
+                result.add(matchResult.getGroup(8) + " second(s)");
+            }
+        }
+        return join(result.toArray(), " ");
+    }
+
+    /**
+     * Tries to get the language of the web page. It looks for
+     * the 'lang' attribute in the HTML tag, if it doesn't find it looks
+     * the meta tags for Content-Language or Language properties.
+     *
+     * @param root The root element.
+     * @return A string containing the language(s) or empty.
+     */
+    public static String getLanguage(Element root) {

[wychen, 2016/05/31 21:56:34]

If the language is specified in http header, instead of inside html, does this
still gets it? Sadly it might not be possible to test in our unit test
environment.

[dalmirsilva, 2016/07/06 17:53:34]

Unfortunately it doesn't get it.  We couldn't find a a solution for getting the
content-language from the http-header without making extra requests, since Dom
Distiller is manipulating the DOM already loaded and ready for work.

[wychen, 2016/07/24 23:06:33]

Got it. I guess this is our technical limitation.

+        String language = root.getLang();
+        if (language.isEmpty()) {
+            NodeList<Element> metas = root.getElementsByTagName("META");

[wychen, 2016/05/31 21:56:34]

Using "META[HTTP-EQUIV="content-language" i][CONTENT],META[NAME="language"
i][CONTENT]" in querySelectorAll() might be faster.

[dalmirsilva, 2016/07/06 17:53:34]

Done.

+            for (int i = 0; i < metas.getLength(); i++) {
+                Element meta = metas.getItem(i);
+                if (meta.getAttribute("HTTP-EQUIV").toUpperCase()
+                        .equals("CONTENT-LANGUAGE") ||
+                        meta.getAttribute("NAME").toUpperCase()
+                                .equals("LANGUAGE")) {
+                    language = meta.getAttribute("CONTENT");
+                    break;
+                }
+            }
+        }
+        return language;
+    }
+
     public static int getArea(Element e) {
         if (e != null) {
             return e.getOffsetHeight() * e.getOffsetWidth();
         }
         return 0;
     }
 
     /**
      * Generate HTML/text output for a given node tree/subtree. This will ignore hidden
      * elements.
@@ skipping 15 matching lines @@
         return l.querySelectorAll(selectors);
     }-*/;
 
     public static native Document createHTMLDocument(Document doc) /*-{
         return doc.implementation.createHTMLDocument();
     }-*/;
 
     public static native Element getFirstElementChild(Document document) /*-{
         return document.firstElementChild;
     }-*/;
+
+    public static native String join(Object[] list, String conjunction) /*-{
+      return list.join(conjunction);
+    }-*/;
 }