biawebutil.hpp

   1 #ifndef __BIAWEBUTIL__
   2 #define __BIAWEBUTIL__
   3 #include <string>
   4 // "discount" markdown library is a C library and hence requires to be wrapped in
   5 // extern "C"
   6 extern "C" {
   7     #include <mkdio.h>
   8 }
   9
  10 // utility functions for Biaweb that don't fit into any class and can be used by
  11 // any class
  12 namespace biaweb {
  13     // convert markdown
  14
  15     std::string convert_to_markdown (std::string str) {
  16         // discount is a C library and it doesn't work well with C++ streams
  17         // and there seems no way to get the output of any of these functions
  18         // into an std::string.
  19         // the only option seems to be to write the output of the markdown()
  20         // function to a temporary working file and then read it back into C++
  21         // with the normal std::ifstream and feed it into the std::string
  22         // till a cleaner solution can be found.
  23         MMIOT *doc;
  24         doc = mkd_string (str.c_str(), str.size(), 0);
  25         FILE *f = fopen (".biaweb.tmp", "w");
  26         markdown (doc, f, 0);
  27         fclose (f);
  28         std::ifstream ftmp (".biaweb.tmp");
  29         std::string tmpl ( (std::istreambuf_iterator<char> (ftmp)),
  30                             (std::istreambuf_iterator<char> ())
  31                                 );
  32         ftmp.close ();
  33         mkd_cleanup (doc);
  34         remove (".biaweb.tmp");
  35         return tmpl;
  36     }
  37
  38     // convert a document title to a file title - strip out the non-alpha
  39     // chars and spaces
  40     std::string convert_title (std::string title)
  41     {
  42         std::string output;
  43         for (char c : title) {
  44             if (isalnum (c))
  45                 output.append (1, c);
  46             else if (isspace (c))
  47                 output.append (1, '_');
  48         }
  49         return output;
  50     }
  51
  52     // escape HTML special characters
  53     std::string escape_html (std::string source)
  54     {
  55         std::string replace_buf;
  56         replace_buf.reserve (source.size());
  57         for (char p : source)
  58         {
  59             switch (p)
  60             {
  61                 case '&' : replace_buf.append ("&amp;"); break;
  62                 case '<' : replace_buf.append ("&lt;"); break;
  63                 case '>' : replace_buf.append ("&gt;"); break;
  64                 case '\"': replace_buf.append ("&quot;"); break;
  65                 case '\'': replace_buf.append ("&apos;"); break;
  66                 default  : replace_buf.append (1, p);
  67             }
  68         }
  69         return replace_buf;
  70     }
  71 }
  72 #endif