biawebsidebar.hpp

   1 #ifndef __BIAWEBSIDEBAR__
   2 #define __BIAWEBSIDEBAR__
   3 #include <string>
   4 #include <list>
   5 #include <iostream>
   6 #include <fstream>
   7 #include "biawebutil.hpp"
   8
   9 // classes to describe the a list of items and sidebar item containers which form part of
  10 // main document
  11 namespace biaweb {
  12     // class to represent a sidebar item which can contain a text and link or only
  13     // text
  14     class SideBarItem {
  15       protected:
  16         // sidebar text and url
  17         std::string sidebar_text;
  18         std::string sidebar_url;
  19       public:
  20         std::string get_sidebar_text () {
  21             return this->sidebar_text;
  22         }
  23         void set_sidebar_text (std::string text) {
  24             this->sidebar_text = text;
  25         }
  26         std::string get_sidebar_url () {
  27             return this->sidebar_url;
  28         }
  29         void set_sidebar_url (std::string url) {
  30             this->sidebar_url = url;
  31         }
  32         std::string to_html ();
  33
  34         SideBarItem (std::string text = "", std::string url = "") {
  35             this->sidebar_text = text;
  36             this->sidebar_url = url;
  37         }
  38     };
  39
  40     std::string SideBarItem::to_html () {
  41         std::string html;
  42         // if url is not empty it is a link item so load the sidebar link template
  43         if (! this->sidebar_url.empty ()) {
  44             if (!this->sidebar_text.empty ())
  45             {
  46                 std::ifstream tpl_linkitem ("templates/sidebarlinkitem.tpl.html");
  47                 std::string tpl_linkitem_str ( (std::istreambuf_iterator<char> (tpl_linkitem)),
  48                                                 (std::istreambuf_iterator<char> ()));
  49                 tpl_linkitem.close ();
  50                 std::unique_ptr<char[]> linktxt (new char[tpl_linkitem_str.size()
  51                                                         + this->sidebar_text.size ()
  52                                                         + this->sidebar_url.size ()] );
  53                 std::sprintf (linktxt.get(), tpl_linkitem_str.c_str (),
  54                                              this->sidebar_url.c_str (),
  55                                             this->sidebar_text.c_str ());
  56                 html.append (linktxt.get ());
  57             }
  58             // no text or url - item is empty - so it should be blank
  59             else
  60                 html = "";
  61         }
  62         // Non link item. Load the normal sidebar item template.
  63         else
  64         {
  65             std::ifstream tpl_item ("templates/sidebaritem.tpl.html");
  66             std::string tpl_item_str ( (std::istreambuf_iterator<char> (tpl_item)),
  67                                         (std::istreambuf_iterator<char> ()));
  68             tpl_item.close ();
  69             std::unique_ptr<char[]> txt (new char [tpl_item_str.size () +
  70                                                     this->sidebar_text.size ()]);
  71             std::sprintf (txt.get (), tpl_item_str.c_str(), this->sidebar_text.c_str());
  72             html.append (txt.get ());
  73         }
  74         return html;
  75     }
  76
  77     // Class to represent a sidebar, which contains one heading and a list of items
  78     // either links or non-link items.
  79     class SideBar {
  80       protected:
  81         std::string sidebar_title;
  82         std::list <SideBarItem> items;
  83
  84       public:
  85         void set_title (std::string title) {
  86             this->sidebar_title = title;
  87         }
  88
  89         void add_sidebar_item (SideBarItem item) {
  90             items.insert (items.cend(), item);
  91         }
  92
  93         // render the sidebar
  94         std::string to_html () ;
  95     };
  96
  97     // render the sidebar to HTML representation from the template.
  98     std::string SideBar::to_html () {
  99         std::ifstream sidetpl ("templates/sidebar.tpl.html");
 100         std::string sidetpl_str ( ( std::istreambuf_iterator<char> (sidetpl)) ,
 101                                        (std::istreambuf_iterator<char> ()));
 102         sidetpl.close ();
 103         std::string listitem;
 104         // first get the sidebar items and render them to HTML
 105         for (SideBarItem item : items) {
 106             listitem += item.to_html ();
 107         }
 108
 109         std::unique_ptr<char[]> tpl_final (new char[sidetpl_str.size() +
 110                                                 this->sidebar_title.size () +
 111                                                 listitem.size () ]);
 112
 113         std::string html;
 114         // if there are items, sidebar should be rendered
 115         if (items.size () > 0)
 116         {
 117             std::sprintf (tpl_final.get (), sidetpl_str.c_str(),
 118                                         this->sidebar_title.c_str(), listitem.c_str()) ;
 119             html.append ( tpl_final.get ());
 120         }
 121         // no items in the sidebar, render as empty string (even if it has a heading)
 122         // since heading becomes meaningless without items
 123         else
 124             html = "";
 125         return html;
 126     }
 127 }
 128
 129 #endif