net/systemeD/halcyon/styleparser/RuleChain.as

   1 package net.systemeD.halcyon.styleparser {
   2
   3     import net.systemeD.halcyon.connection.*;
   4
   5         /**     A descendant list of MapCSS selectors (Rules).
   6
   7                 For example,
   8                         relation[type=route] way[highway=primary]
   9                         ^^^^^^^^^^^^^^^^^^^^ ^^^^^^^^^^^^^^^^^^^^
  10                             first Rule           second Rule
  11                                |------------|---------|
  12                                             |
  13                                      one RuleChain
  14
  15         */
  16
  17         public class RuleChain {
  18                 public var rules:Array=[];                              // should eventually become a Vector of Rules
  19                 public var subpart:String='default';    // subpart name, as in way[highway=primary]::centreline
  20
  21                 // Test a ruleChain
  22                 // - run a set of tests in the chain
  23                 //              works backwards from at position "pos" in array, or -1  for the last
  24                 //              separate tags object is required in case they've been dynamically retagged
  25                 // - if they fail, return false
  26                 // - if they succeed, and it's the last in the chain, return happily
  27                 // - if they succeed, and there's more in the chain, rerun this for each parent until success
  28
  29                 public function test(pos:int, obj:Entity, tags:Object, zoom:uint):Boolean {
  30                         if (length==0) { return false; }
  31                         if (pos==-1) { pos=rules.length-1; }
  32
  33                         var r:Rule=rules[pos];
  34                         if (!r.test(obj, tags, zoom)) { return false; }
  35                         if (pos==0) { return true; }
  36
  37                         var o:Array=obj.parentObjects;
  38                         for each (var p:Entity in o) {
  39                                 if (test(pos-1, p, p.getTagsHash(), zoom)) { return true; }
  40                         }
  41                         return false;
  42                 }
  43
  44                 public function get length():int {
  45                         return rules.length;
  46                 }
  47
  48                 public function setSubpart(s:String):void {
  49                         subpart = s=='' ? 'default' : s;
  50                 }
  51
  52                 // ---------------------------------------------------------------------------------------------
  53                 // Methods to add properties (used by parsers such as MapCSS)
  54
  55                 public function addRule(e:String=''):void {
  56                         rules.push(new Rule(e));
  57                 }
  58
  59                 public function addConditionToLast(c:Condition):void {
  60                         rules[rules.length-1].conditions.push(c);
  61                 }
  62
  63                 public function addZoomToLast(z1:uint,z2:uint):void {
  64                         rules[rules.length-1].minZoom=z1;
  65                         rules[rules.length-1].maxZoom=z2;
  66                 }
  67
  68         }
  69 }