feature #32061 Add new Form WeekType (dFayet)

This PR was merged into the 4.4 branch.

Discussion
----------

Add new Form WeekType

| Q             | A
| ------------- | ---
| Branch?       | 4.4
| Bug fix?      | no
| New feature?  | yes <!-- please update src/**/CHANGELOG.md files -->
| BC breaks?    | no     <!-- see https://symfony.com/bc -->
| Deprecations? | no <!-- please update UPGRADE-*.md and src/**/CHANGELOG.md files -->
| Tests pass?   | yes    <!-- please add some, will be required by reviewers -->
| Fixed tickets | #32029
| License       | MIT
| Doc PR        | <!--symfony/symfony-docs#...--> coming soon

----
#### Update

After the first try, I've updated the field to have more options, and be more "straight".
The field acts like the `DateTimeType` or `TimeType`,  various fields type (pure text, html5 type, select boxes), data validation, ....

For that I took the choice to update the `DateTimeToStringTransformer` and `DateTimeToArrayTransformer` to make them work with weeks format.

I was not sure if it was better to update them or create new ones, WDYT?

Before addind tests and docs, it would be nice to have your first thoughts/comments 😊

Do you need/want a small test repo?

Commits
-------

c4a2f026e0 Add new Form WeekType

Author: fabpot

Resources/views/Form/form_div_layout.html.twig

@@ -255,6 +255,17 @@
     {{ block('form_widget_simple') }}
 {%- endblock color_widget -%}
 
+{%- block week_widget -%}
+    {%- if widget == 'single_text' -%}
+        {{ block('form_widget_simple') }}
+    {%- else -%}
+        {%- set vars = widget == 'text' ? { 'attr': { 'size': 1 }} : {} -%}
+        <div {{ block('widget_container_attributes') }}>
+            {{ form_widget(form.year, vars) }}-{{ form_widget(form.week, vars) }}
+        </div>
+    {%- endif -%}
+{%- endblock week_widget -%}
+
 {# Labels #}
 
 {%- block form_label -%}

Tests/Extension/AbstractBootstrap3LayoutTest.php

@@ -2722,6 +2722,104 @@ public function testColor()
     [@name="name"]
     [@class="my&class form-control"]
     [@value="#0000ff"]
+'
+        );
+    }
+
+    public function testWeekSingleText()
+    {
+        $this->requiresFeatureSet(404);
+
+        $form = $this->factory->createNamed('holidays', 'Symfony\Component\Form\Extension\Core\Type\WeekType', '1970-W01', [
+            'input' => 'string',
+            'widget' => 'single_text',
+        ]);
+
+        $this->assertWidgetMatchesXpath($form->createView(), ['attr' => ['class' => 'my&class']],
+            '/input
+    [@type="week"]
+    [@name="holidays"]
+    [@class="my&class form-control"]
+    [@value="1970-W01"]
+    [not(@maxlength)]
+'
+        );
+    }
+
+    public function testWeekSingleTextNoHtml5()
+    {
+        $this->requiresFeatureSet(404);
+
+        $form = $this->factory->createNamed('holidays', 'Symfony\Component\Form\Extension\Core\Type\WeekType', '1970-W01', [
+            'input' => 'string',
+            'widget' => 'single_text',
+            'html5' => false,
+        ]);
+
+        $this->assertWidgetMatchesXpath($form->createView(), ['attr' => ['class' => 'my&class']],
+            '/input
+    [@type="text"]
+    [@name="holidays"]
+    [@class="my&class form-control"]
+    [@value="1970-W01"]
+    [not(@maxlength)]
+'
+        );
+    }
+
+    public function testWeekChoices()
+    {
+        $this->requiresFeatureSet(404);
+
+        $data = ['year' => date('Y'), 'week' => 1];
+
+        $form = $this->factory->createNamed('name', 'Symfony\Component\Form\Extension\Core\Type\WeekType', $data, [
+            'input' => 'array',
+            'required' => false,
+        ]);
+
+        $this->assertWidgetMatchesXpath($form->createView(), ['attr' => ['class' => 'my&class']],
+            '/div
+    [@class="my&class"]
+    [
+        ./select
+            [@id="name_year"]
+            [@class="form-control"]
+            [./option[@value="'.$data['year'].'"][@selected="selected"]]
+        /following-sibling::select
+            [@id="name_week"]
+            [@class="form-control"]
+            [./option[@value="'.$data['week'].'"][@selected="selected"]]
+    ]
+    [count(.//select)=2]'
+        );
+    }
+
+    public function testWeekText()
+    {
+        $this->requiresFeatureSet(404);
+
+        $form = $this->factory->createNamed('name', 'Symfony\Component\Form\Extension\Core\Type\WeekType', '2000-W01', [
+            'input' => 'string',
+            'widget' => 'text',
+        ]);
+
+        $this->assertWidgetMatchesXpath($form->createView(), ['attr' => ['class' => 'my&class']],
+            '/div
+    [@class="my&class"]
+    [
+        ./input
+            [@id="name_year"]
+            [@type="number"]
+            [@class="form-control"]
+            [@value="2000"]
+        /following-sibling::input
+            [@id="name_week"]
+            [@type="number"]
+            [@class="form-control"]
+            [@value="1"]
+    ]
+    [count(./input)=2]
 '
         );
     }