build/freq.js

   1 #! /usr/bin/env node
   2
   3 var fs = require( "fs" );
   4
   5 function isEmptyObject( obj ) {
   6         for ( var name in obj ) {
   7                 return false;
   8         }
   9         return true;
  10 }
  11 function extend( obj ) {
  12         var dest = obj,
  13         src = [].slice.call( arguments, 1 );
  14
  15         Object.keys( src ).forEach(function( key ) {
  16                 var copy = src[ key ];
  17
  18                 for ( var prop in copy ) {
  19                         dest[ prop ] = copy[ prop ];
  20                 }
  21         });
  22
  23         return dest;
  24 };
  25
  26 function charSort( obj, callback ) {
  27
  28         var ordered = [],
  29                 table = {},
  30                 copied;
  31
  32         copied = extend({}, obj );
  33
  34         (function order() {
  35
  36                 var largest = 0,
  37                                 c;
  38
  39                 for ( var i in obj ) {
  40                         if ( obj[ i ] >= largest ) {
  41                                 largest = obj[ i ];
  42                                 c = i;
  43                         }
  44                 }
  45
  46                 ordered.push( c );
  47                 delete obj[ c ];
  48
  49                 if ( !isEmptyObject( obj ) ) {
  50                         order();
  51                 } else {
  52                         ordered.forEach(function( val ) {
  53                                 table[ val ] = copied[ val ];
  54                         });
  55
  56                         callback( table );
  57                 }
  58
  59         })();
  60 }
  61 function charFrequency( src, callback ) {
  62         var obj = {};
  63
  64         src.replace(/[^\w]|\d/gi, "").split("").forEach(function( c ) {
  65                 obj[ c ] ? ++obj[ c ] : ( obj[ c ] = 1 );
  66         });
  67
  68         return charSort( obj, callback );
  69 }
  70
  71
  72 charFrequency( fs.readFileSync( "dist/jquery.min.js", "utf8" ), function( obj ) {
  73         var chr;
  74
  75         for ( chr in obj ) {
  76                 console.log( "  " + chr + "   " + obj[ chr ] );
  77         }
  78 });
  79