[IMP] web: add math_utils to core

math_utils is a small library that exports two
functions:

    - cartesian: allows to compute the cartesian
                products of any numbers of arrays
                while preserving the internal
                structures of their elements.
    - sections: returns an array with all
                the initial sections of the
                array passed as parameter.

1 files changed, 56 insertions, 0 deletions

diff --git a/addons/web/static/tests/core/math_utils_tests.js b/addons/web/static/tests/core/math_utils_tests.js
new file mode 100644
index 00000000000..894cb0be4f7
--- /dev/null
+++ b/addons/web/static/tests/core/math_utils_tests.js
@@ -0,0 +1,56 @@
+odoo.define('web.math_utils_tests', function(require) {
+"use strict";
+
+var mathUtils = require('web.mathUtils');
+var cartesian = mathUtils.cartesian;
+
+QUnit.module('mathUtils', function () {
+
+    QUnit.module('cartesian');
+
+
+    QUnit.test('cartesian product of zero arrays', function(assert) {
+        assert.expect(1);
+        assert.deepEqual(cartesian(), [undefined],
+            "the unit of the product is a singleton");
+    });
+
+    QUnit.test('cartesian product of a single array', function(assert) {
+        assert.expect(5);
+        assert.deepEqual(cartesian([]), []);
+        assert.deepEqual(cartesian([1]), [1],
+            "we don't want unecessary brackets");
+        assert.deepEqual(cartesian([1, 2]), [1, 2]);
+        assert.deepEqual(cartesian([[1, 2]]), [[1, 2]],
+            "the internal structure of elements should be preserved");
+        assert.deepEqual(cartesian([[1, 2], [3, [2]]]), [[1, 2], [3, [2]]],
+            "the internal structure of elements should be preserved");
+    });
+
+    QUnit.test('cartesian product of two arrays', function(assert) {
+        assert.expect(5);
+        assert.deepEqual(cartesian([], []), []);
+        assert.deepEqual(cartesian([1], []), []);
+        assert.deepEqual(cartesian([1], [2]), [[1, 2]]);
+        assert.deepEqual(cartesian([1, 2], [3]), [[1, 3], [2, 3]]);
+        assert.deepEqual(cartesian([[1], 4], [2, [3]]), [[[1], 2], [[1], [3]], [4, 2], [4, [3]] ],
+            "the internal structure of elements should be preserved");
+    });
+
+    QUnit.test('cartesian product of three arrays', function(assert) {
+        assert.expect(4);
+        assert.deepEqual(cartesian([], [], []), []);
+        assert.deepEqual(cartesian([1], [], [2, 5]), []);
+        assert.deepEqual(cartesian([1], [2], [3]), [[1, 2, 3]],
+            "we should have no unecessary brackets, we want elements to be 'triples'");
+        assert.deepEqual(cartesian([[1], 2], [3], [4]), [[[1], 3, 4], [2, 3, 4]],
+            "the internal structure of elements should be preserved");
+    });
+
+    QUnit.test('cartesian product of four arrays', function(assert) {
+        assert.expect(1);
+        assert.deepEqual(cartesian([1], [2], [3], [4]), [[1, 2, 3, 4]]);
+    });
+
+});
+});
\ No newline at end of file