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      1 // Return a single-proxy result, which encodes ALL the arguments that were
      2 // passed to FindProxyForURL().
      3 
      4 function FindProxyForURL(url, host) {
      5   if (arguments.length != 2) {
      6     throw "Wrong number of arguments passed to FindProxyForURL!";
      7     return "FAIL";
      8   }
      9 
     10   return "PROXY " + makePseudoHost(url + "." + host);
     11 }
     12 
     13 // Form a string that kind-of resembles a host. We will replace any
     14 // non-alphanumeric character with a dot, then fix up the oddly placed dots.
     15 function makePseudoHost(str) {
     16   var result = "";
     17 
     18   for (var i = 0; i < str.length; ++i) {
     19     var c = str.charAt(i);
     20     if (!isValidPseudoHostChar(c)) {
     21       c = '.';  // Replace unsupported characters with a dot.
     22     }
     23 
     24     // Take care not to place multiple adjacent dots,
     25     // a dot at the beginning, or a dot at the end.
     26     if (c == '.' &&
     27         (result.length == 0 || 
     28          i == str.length - 1 ||
     29          result.charAt(result.length - 1) == '.')) {
     30       continue;
     31     }
     32     result += c;
     33   }
     34   return result;
     35 }
     36 
     37 function isValidPseudoHostChar(c) {
     38   if (c >= '0' && c <= '9')
     39     return true;
     40   if (c >= 'a' && c <= 'z')
     41     return true;
     42   if (c >= 'A' && c <= 'Z')
     43     return true;
     44   return false;
     45 }
     46