Open-ILS/xul/staff_client/chrome/content/util/functional.js

   1 dump('entering util/functional.js\n');
   2
   3 if (typeof util == 'undefined') var util = {};
   4 util.functional = {};
   5
   6 util.functional.EXPORT_OK       = [
   7         'filter_list', 'filter_object', 'find_list', 'find_object', 'map_list', 'map_flat_list',
   8         'map_object', 'map_object_to_list', 'convert_object_list_to_hash', 'find_id_object_in_list',
   9         'find_attr_object_in_list', 'walk_tree_preorder',
  10 ];
  11 util.functional.EXPORT_TAGS     = { ':all' : util.functional.EXPORT_OK };
  12
  13 util.functional.filter_list = function(list,f) {
  14         var new_list = [];
  15         for (var i in list) {
  16                 var t = f( list[i] );
  17                 if (t) new_list.push( list[i] );
  18         }
  19         return new_list;
  20 }
  21
  22 util.functional.filter_object = function(obj,f) {
  23         var new_obj = {};
  24         for (var i in obj) {
  25                 var t = f( i, obj[i] );
  26                 if (t) new_obj[i] = obj[i];
  27         }
  28         return new_obj;
  29 }
  30
  31 util.functional.find_list = function(list,f) {
  32         for (var i in list) {
  33                 var t = f( list[i] );
  34                 if (t) return list[i];
  35         }
  36         return null;
  37 }
  38
  39 util.functional.find_object = function(obj,f) {
  40         for (var i in obj) {
  41                 var t = f( i, obj[i] );
  42                 if (t) return obj[i];
  43         }
  44         return null;
  45 }
  46
  47 util.functional.walk_tree_preorder = function(node,children_func,f,parent_node) {
  48         f(node,parent_node);
  49         var children = children_func( node );
  50         if (children) for (var i = 0; i < children.length; i++) {
  51                 util.functional.walk_tree_preorder(
  52                         children[i],
  53                         children_func,
  54                         f,
  55                         node
  56                 );
  57         }
  58 }
  59
  60 util.functional.map_list = function(list,f) {
  61         var new_list = []; var idx = 0;
  62         for (var i in list) {
  63                 new_list.push( f( list[i], idx++ ) );
  64         }
  65         return new_list;
  66 }
  67
  68 util.functional.map_flat_list = function(list,f) {
  69         var new_list = [];
  70         for (var i in list) {
  71                 new_list = new_list.concat( f( list[i] ) );
  72         }
  73         return new_list;
  74 }
  75
  76 util.functional.map_object = function(obj,f) {
  77         var new_obj = {};
  78         for (var i in obj) {
  79                 new_obj[ f( i, obj[i] )[0] ] = f( i, obj[i] )[1];
  80         }
  81         return new_obj;
  82 }
  83
  84 util.functional.map_object_to_list = function(obj,f) {
  85         var new_list = [];
  86         for (var i in obj) {
  87                 new_list.push( f( obj, i ) );
  88         }
  89         return new_list;
  90 }
  91
  92 util.functional.convert_object_list_to_hash = function(list) {
  93         var my_hash = new Object();
  94         if (list) {
  95                 for (var i = 0; i < list.length; i++) {
  96                         if (typeof list[i].id == 'function') {
  97                                 my_hash[ list[i].id() ] = list[i];
  98                         } else if (typeof list[i].code == 'function') {
  99                                 my_hash[ list[i].code() ] = list[i];
 100                         }
 101                 }
 102         }
 103         return my_hash;
 104 }
 105
 106 util.functional.find_id_object_in_list = function(list,id) {
 107         if (list) {
 108                 for (var i = 0; i < list.length; i++ ) {
 109                         try {
 110                                 if ( list[i].id() == id ) {
 111                                         return list[i];
 112                                 }
 113                         } catch(E) {
 114                                 throw(E);
 115                         }
 116                 }
 117         }
 118         return null;
 119 }
 120
 121 util.functional.find_attr_object_in_list = function(list,attr,value) {
 122         if (list) {
 123                 for (var i = 0; i < list.length; i++ ) {
 124                         try {
 125                                 var command = 'list[' + i + '].'+attr+'() == ' + value;
 126                                 if ( eval(command) ) {
 127                                         return list[i];
 128                                 }
 129                         } catch(E) {
 130                                 throw(E);
 131                         }
 132                 }
 133         }
 134         return null;
 135 }
 136
 137 dump('exiting util/functional.js\n');