time.html

   1 <html>
   2     <head>
   3         <title>Time calculator</title>
   4         <link rel="stylesheet" href="style/pixelless.css" />
   5         <script type="text/javascript" src="unit-expressions/script/expression.js"></script>
   6     </head>
   7     <body>
   8         <div id="container">
   9             <div class="content header">
  10                 <h1>Time calculator</h1>
  11             </div>
  12             <div class="content">
  13                 <p><pre>today - 2 weeks</pre></p>
  14                 <p><pre>2 weeks ago</pre></p>
  15                 <p><pre>3 dec 2009 + 11 months 2 days</pre></p>
  16                 <p><pre>2 feb 1984 + 365 days * 25</pre></p>
  17             </div>
  18             <div id="empty_footer"></div>
  19         </div>
  20         <div id="footer">
  21             &copy; 2009 Vynogradov
  22         </div>
  23
  24         <script type="text/javascript">
  25             function ripExamples(ex)
  26             {
  27                 var shorts = [['yesterday', '1 day ago']];
  28                 function rectifyAgo(x)
  29                 {
  30                     var i=-1, n=shorts.length;
  31                     while(++i<n)
  32                     {
  33                         x = x.replace(shorts[i][0], shorts[i][1]);
  34                     }
  35
  36                     return x
  37                         .replace(/(\d+)\s+(weeks|days|months|years)\s+ago/, 'today - $1 $2')
  38                         .replace(/(a\s+)?(day|week|month|year)\s+ago/, "today - 1 $2")
  39                 }
  40
  41                 return new Expression(rectifyAgo(ex.innerHTML));
  42             }
  43
  44             function Span(num, period)
  45             {
  46                 // TODO: Save all durations separately in order to be able to
  47                 //      +properly calculate months or year shifts.
  48                 this.len = num * len[period];
  49             }
  50
  51             function parse(obj)
  52             {
  53                 var dat, match;
  54                 if(obj == 'today')
  55                     dat = new Date();
  56                 else if(!!(match = obj.match(/(\d+)\s+(day|month|year|week)s/g)))
  57                 {
  58                     console.log(match);
  59                     dat = new Span(match);
  60                 }
  61                 else
  62                     dat = new Date(obj);
  63                 console.log(obj, dat);
  64                 return dat;
  65             }
  66
  67             function calculate(left, op, right)
  68             {
  69             }
  70
  71             function evaluate(expr)
  72             {
  73                 var left = expr.left;
  74                 var right = expr.right;
  75
  76                 if(left instanceof Expression) left = evaluate(left);
  77                 if(right instanceof Expression) right = evaluate(right);
  78
  79                 if(typeof left == 'string') left = parse(left);
  80                 if(typeof right == 'string') right = parse(right);
  81
  82                 return calculate(left, expr.op, right);
  83             }
  84
  85             var examples = [].map.call(document.getElementsByTagName('pre'), ripExamples);
  86             console.log(examples);
  87             var values = examples.map(evaluate);
  88         </script>
  89     </body>
  90 </html>