Adding dotNotation property and test

src/prop_tests/dotNotation_test.js

@@ -0,0 +1,94 @@
+var QUnit = require("steal-qunit");
+
+var set = require('../set-core'),
+  props = require("../props");
+
+QUnit.module("can-set props.dotNotation");
+
+/*
+ * For the dotNotation prop, we define sets like so:
+ *
+ * For a property 'n.p', with value 'IL'
+ * x ∈ X | x.n.p = 'IL'
+ *
+ */
+test('dotNotation set membership', function() {
+  /*
+   * For a property 'n.p', with value 'IL'
+   * x ∈ X | x.n.p == 'IL'
+   */
+  var prop = props.dotNotation('n.p'),
+    alg = new set.Algebra(prop),
+    res = alg.has({'n.p': 'IL'}, {n:{p:'IL'}});
+  ok(res, "object with nested property is member of set using dotNotation");
+
+  /*
+   * For a property 'n.p', with value 'IL'
+   * x ∉ X | x.n.p != 'IL'
+   */
+  res = alg.has({'n.p': 'IL'}, {n:{p:'MI'}});
+  ok(res === false, "object with nested property not a member of set using dotNotation");
+
+  /*
+   * For a property 'n.p.s', with value 'IL'
+   * x ∈ X | x.n.p.s == 'IL'
+   */
+  prop = props.dotNotation('n.p.s');
+  alg = new set.Algebra(prop);
+  res = alg.has({'n.p.s': 'IL'}, {n:{p:{s:'IL'}}});
+  ok(res, "object with deep nested property is member of set using dotNotation");
+});
+
+test('dotNotation set equality', function() {
+  var prop = props.dotNotation('n.p'),
+    alg = new set.Algebra(prop),
+    set1 = {'n.p': 'IL'},
+    set2 = {'n.p': 'IL'},
+    set3 = {'n.p': 'MI'},
+    set4 = {n:{p:'MI'}};
+
+  /*
+   * {x | x ∈ X, x.n.p == 'IL'} = {y | y ∈ Y, y.n.p == 'IL'}
+   */
+  ok(alg.equal(set1, set2) && alg.equal(set2, set1), "sets with dotNotation properties are equivalent");
+
+  /*
+   * {x | x ∈ X, x.n.p == 'IL'} != {y | y ∈ Y, y.n.p == 'MI'}
+   */
+  ok(alg.equal(set1, set3) === false, "sets with dotNotation properties are not equivalent");
+
+  /*
+   * {x | x ∈ X, x.n.p == 'MI'} = {y | y ∈ Y, y.n.p == 'MI'}
+   */
+  ok(alg.equal(set4, set3) === false, "sets with dotNotation properties are equivalent to sets with nested properties");
+});
+
+test('dotNotation set subset', function() {
+  var alg = new set.Algebra(
+      props.dotNotation('address.state'),
+      props.dotNotation('address.city')
+    ),
+    set1 = {'address.state': 'IL'},
+    set2 = {'address.state': 'IL', 'address.city': 'Chicago'},
+    set3 = {address: {state: 'IL', city: 'Chicago'}};
+
+  /*
+   * {x | x ∈ X, x.address.state = 'IL', x.address.city = 'Chicago'} ⊆ {y | y ∈ Y, y.address.state == 'IL'}
+   */
+  ok(alg.subset(set2, set1), "sets with dotNotation property is a subset of another dotNotation set");
+
+  /*
+   * {x | x ∈ X, x.address.state = 'IL', x.address.city = 'Chicago'} ⊆ {y | y ∈ Y, y.address.state == 'IL'}
+   */
+  ok(alg.subset(set3, set1), "sets with nested property notation is a subset of a dotNotation set");
+
+  /*
+   * {y | y ∈ Y, y.address.state == 'IL'} ⊆ ξ
+   */
+  ok(alg.subset(set1, {}), "sets with dotNotation properties are subsets of the universal set");
+
+  /*
+   * ξ ⊄ {y | y ∈ Y, y.address.state == 'IL'}
+   */
+  ok(alg.subset({}, set1) === false, "the universal set is not a subset of a set with dotNotation");
+});

src/props.js

@@ -483,4 +483,51 @@ props.rangeInclusive = function(startIndexProperty, endIndexProperty){
 		});
 };
 
+var nestedLookup = function(obj, propNameArray) {
+	if (obj === undefined) {
+		return undefined;
+	}
+
+	if (propNameArray.length === 1) {
+		return obj[propNameArray[0]];
+	} else {
+		return nestedLookup(obj[propNameArray[0]], propNameArray.slice(1));
+	}
+};
+/**
+ * @function can-set.props.dotNotation dotNotation
+ * @parent can-set.props
+ *
+ * @description Supports MongoDB-style 'dot notation' properties.
+ *
+ * @signature `set.props.dotNotation(dotProperty)`
+ *
+ * Defines a property that specifies a MongoDB-style nested property match.
+ * For example, a set property of "address.city" matches against the value of the nested `{address: {city}}` value.
+ *
+ * ```
+ * set.props.dotNotation("address.city")
+ * ```
+ *
+ *   @param  {String} dotProperty The MongoDB-style nested property name
+ *   @return {can-set.compares} Returns a comparator used to build a set algebra
+ */
+props.dotNotation = function(dotProperty){
+	var compares = new clause.Where({});
+
+	compares[dotProperty] = function(aVal, bVal, a, b, propertyName) {
+		// if the value wasn't picked out from the parent try a dotNotation lookup
+		if (aVal === undefined) {
+			aVal = nestedLookup(a, propertyName.split('.'));
+		}
+		if (bVal === undefined) {
+			bVal = nestedLookup(b, propertyName.split('.'));
+		}
+
+		return aVal === bVal;
+	};
+
+	return compares;
+};
+
 module.exports = props;

src/props_test.js

@@ -7,3 +7,4 @@ require('./prop_tests/rangeInclusive_test');
 require('./prop_tests/offsetLimit_test');
 require('./prop_tests/boolean_test');
 require('./prop_tests/enum_test');
+require('./prop_tests/dotNotation_test');