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1 files changed, 133 insertions, 0 deletions

diff --git a/client/lib/filter.js b/client/lib/filter.js
new file mode 100644
index 00000000..507a2bb7
--- /dev/null
+++ b/client/lib/filter.js
@@ -0,0 +1,133 @@
+// Filtered view manager
+// We define local filter objects for each different type of field (SetFilter,
+// RangeFilter, dateFilter, etc.). We then define a global `Filter` object whose
+// goal is to filter complete documents by using the local filters for each
+// fields.
+
+// Use a "set" filter for a field that is a set of documents uniquely
+// identified. For instance `{ labels: ['labelA', 'labelC', 'labelD'] }`.
+var SetFilter = function() {
+  this._dep = new Tracker.Dependency();
+  this._selectedElements = [];
+};
+
+_.extend(SetFilter.prototype, {
+  isSelected: function(val) {
+    this._dep.depend();
+    return this._selectedElements.indexOf(val) > -1;
+  },
+
+  add: function(val) {
+    if (this.indexOfVal(val) === -1) {
+      this._selectedElements.push(val);
+      this._dep.changed();
+    }
+  },
+
+  remove: function(val) {
+    var indexOfVal = this._indexOfVal(val);
+    if (this.indexOfVal(val) !== -1) {
+      this._selectedElements.splice(indexOfVal, 1);
+      this._dep.changed();
+    }
+  },
+
+  toogle: function(val) {
+    var indexOfVal = this._indexOfVal(val);
+    if (indexOfVal === -1) {
+      this._selectedElements.push(val);
+    } else {
+      this._selectedElements.splice(indexOfVal, 1);
+    }
+
+    this._dep.changed();
+  },
+
+  reset: function() {
+    this._selectedElements = [];
+    this._dep.changed();
+  },
+
+  _indexOfVal: function(val) {
+    return this._selectedElements.indexOf(val);
+  },
+
+  _isActive: function() {
+    this._dep.depend();
+    return this._selectedElements.length !== 0;
+  },
+
+  _getMongoSelector: function() {
+    this._dep.depend();
+    return { $in: this._selectedElements };
+  }
+});
+
+// The global Filter object.
+// XXX It would be possible to re-write this object more elegantly, and removing
+// the need to provide a list of `_fields`. We also should move methods into the
+// object prototype.
+Filter = {
+  // XXX I would like to rename this field into `labels` to be consistent with
+  // the rest of the schema, but we need to set some migrations architecture
+  // before changing the schema.
+  labelIds: new SetFilter(),
+  members: new SetFilter(),
+
+  _fields: ['labelIds', 'members'],
+
+  // We don't filter cards that have been added after the last filter change. To
+  // implement this we keep the id of these cards in this `_exceptions` fields
+  // and use a `$or` condition in the mongo selector we return.
+  _exceptions: [],
+  _exceptionsDep: new Tracker.Dependency(),
+
+  isActive: function() {
+    var self = this;
+    return _.any(self._fields, function(fieldName) {
+      return self[fieldName]._isActive();
+    });
+  },
+
+  getMongoSelector: function() {
+    var self = this;
+
+    if (! self.isActive())
+      return {};
+
+    var filterSelector = {};
+    _.forEach(self._fields, function(fieldName) {
+      var filter = self[fieldName];
+      if (filter._isActive())
+        filterSelector[fieldName] = filter._getMongoSelector();
+    });
+
+    var exceptionsSelector = {_id: {$in: this._exceptions}};
+    this._exceptionsDep.depend();
+
+    return {$or: [filterSelector, exceptionsSelector]};
+  },
+
+  reset: function() {
+    var self = this;
+    _.forEach(self._fields, function(fieldName) {
+      var filter = self[fieldName];
+      filter.reset();
+    });
+    self.resetExceptions();
+  },
+
+  addException: function(_id) {
+    if (this.isActive()) {
+      this._exceptions.push(_id);
+      this._exceptionsDep.changed();
+    }
+  },
+
+  resetExceptions: function() {
+    this._exceptions = [];
+    this._exceptionsDep.changed();
+  }
+};
+
+Blaze.registerHelper('Filter', Filter);