[SPARK-1564] [DOCS] Added Javascript to Javadocs to create badges for tags like :: Experimental ::

Modified copy_api_dirs.rb and created api-javadocs.js and api-javadocs.css files in order to add badges to javadoc files for :: Experimental ::, :: DeveloperApi ::, and :: AlphaComponent :: tags

Author: Deron Eriksson <deron@us.ibm.com>

Closes #7169 from deroneriksson/SPARK-1564_JavaDocs_badges and squashes the following commits:

a8353db [Deron Eriksson] added license headers to api-docs.css and api-javadocs.css
07feb07 [Deron Eriksson] added linebreaks to make jquery more readable when adding html badge tags
65b4930 [Deron Eriksson] Modified copy_api_dirs.rb and created api-javadocs.js and api-javadocs.css files in order to add badges to javadoc files for :: Experimental ::, :: DeveloperApi ::, and :: AlphaComponent :: tags

docs/_plugins/copy_api_dirs.rb

@@ -63,6 +63,51 @@ if not (ENV['SKIP_API'] == '1')
 
     puts "cp -r " + source + "/. " + dest
     cp_r(source + "/.", dest)
+
+    # Begin updating JavaDoc files for badge post-processing
+    puts "Updating JavaDoc files for badge post-processing"
+    js_script_start = '<script defer="defer" type="text/javascript" src="'
+    js_script_end = '.js"></script>'
+
+    javadoc_files = Dir["./" + dest + "/**/*.html"]
+    javadoc_files.each do |javadoc_file|
+      # Determine file depths to reference js files
+      slash_count = javadoc_file.count "/"
+      i = 3
+      path_to_js_file = ""
+      while (i < slash_count) do
+        path_to_js_file = path_to_js_file + "../"
+        i += 1
+      end
+
+      # Create script elements to reference js files
+      javadoc_jquery_script = js_script_start + path_to_js_file + "lib/jquery" + js_script_end;
+      javadoc_api_docs_script = js_script_start + path_to_js_file + "lib/api-javadocs" + js_script_end;
+      javadoc_script_elements = javadoc_jquery_script + javadoc_api_docs_script
+
+      # Add script elements to JavaDoc files
+      javadoc_file_content = File.open(javadoc_file, "r") { |f| f.read }
+      javadoc_file_content = javadoc_file_content.sub("</body>", javadoc_script_elements + "</body>")
+      File.open(javadoc_file, "w") { |f| f.puts(javadoc_file_content) }
+
+    end
+    # End updating JavaDoc files for badge post-processing
+
+    puts "Copying jquery.js from Scala API to Java API for page post-processing of badges"
+    jquery_src_file = "./api/scala/lib/jquery.js"
+    jquery_dest_file = "./api/java/lib/jquery.js"
+    mkdir_p("./api/java/lib")
+    cp(jquery_src_file, jquery_dest_file)
+
+    puts "Copying api_javadocs.js to Java API for page post-processing of badges"
+    api_javadocs_src_file = "./js/api-javadocs.js"
+    api_javadocs_dest_file = "./api/java/lib/api-javadocs.js"
+    cp(api_javadocs_src_file, api_javadocs_dest_file)
+
+    puts "Appending content of api-javadocs.css to JavaDoc stylesheet.css for badge styles"
+    css = File.readlines("./css/api-javadocs.css")
+    css_file = dest + "/stylesheet.css"
+    File.open(css_file, 'a') { |f| f.write("\n" + css.join()) }
   end
 
   # Build Sphinx docs for Python

docs/css/api-docs.css

+/*
+ * Licensed to the Apache Software Foundation (ASF) under one or more
+ * contributor license agreements.  See the NOTICE file distributed with
+ * this work for additional information regarding copyright ownership.
+ * The ASF licenses this file to You 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.
+ */
+
 /* Dynamically injected style for the API docs */
 
 .developer {

docs/css/api-javadocs.css

+/*
+ * Licensed to the Apache Software Foundation (ASF) under one or more
+ * contributor license agreements.  See the NOTICE file distributed with
+ * this work for additional information regarding copyright ownership.
+ * The ASF licenses this file to You 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.
+ */
+
+/* Dynamically injected style for the API docs */
+
+.badge {
+  font-family: Arial, san-serif;
+  float: right;
+  margin: 4px;
+  /* The following declarations are taken from the ScalaDoc template.css */
+  display: inline-block;
+  padding: 2px 4px;
+  font-size: 11.844px;
+  font-weight: bold;
+  line-height: 14px;
+  color: #ffffff;
+  text-shadow: 0 -1px 0 rgba(0, 0, 0, 0.25);
+  white-space: nowrap;
+  vertical-align: baseline;
+  background-color: #999999;
+  padding-right: 9px;
+  padding-left: 9px;
+  -webkit-border-radius: 9px;
+     -moz-border-radius: 9px;
+          border-radius: 9px;
+}
+
+.developer {
+  background-color: #44751E;
+}
+
+.experimental {
+  background-color: #257080;
+}
+
+.alphaComponent {
+  background-color: #bb0000;
+}

docs/js/api-javadocs.js

+/*
+ * Licensed to the Apache Software Foundation (ASF) under one or more
+ * contributor license agreements.  See the NOTICE file distributed with
+ * this work for additional information regarding copyright ownership.
+ * The ASF licenses this file to You 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.
+ */
+
+/* Dynamically injected post-processing code for the API docs */
+
+$(document).ready(function() {
+  addBadges(":: AlphaComponent ::", '<span class="alphaComponent badge">Alpha Component</span>');
+  addBadges(":: DeveloperApi ::", '<span class="developer badge">Developer API</span>');
+  addBadges(":: Experimental ::", '<span class="experimental badge">Experimental</span>');
+});
+
+function addBadges(tag, html) {
+  var tags = $(".block:contains(" + tag + ")")
+
+  // Remove identifier tags
+  tags.each(function(index) {
+    var oldHTML = $(this).html();
+    var newHTML = oldHTML.replace(tag, "");
+    $(this).html(newHTML);
+  });
+
+  // Add html badge tags
+  tags.each(function(index) {
+    if ($(this).parent().is('td.colLast')) {
+      $(this).parent().prepend(html);
+    } else if ($(this).parent('li.blockList')
+                      .parent('ul.blockList')
+                      .parent('div.description')
+                      .parent().is('div.contentContainer')) {
+      var contentContainer = $(this).parent('li.blockList')
+                                    .parent('ul.blockList')
+                                    .parent('div.description')
+                                    .parent('div.contentContainer')
+      var header = contentContainer.prev('div.header');
+      if (header.length > 0) {
+        header.prepend(html);
+      } else {
+        contentContainer.prepend(html);
+      }
+    } else if ($(this).parent().is('li.blockList')) {
+      $(this).parent().prepend(html);
+    } else {
+      $(this).prepend(html);
+    }
+  });
+}