Switch, Case, and DefaultCase components.

TODO.md

@@ -13,7 +13,7 @@
 - [ ] di bug: @Singleton toSelf() causes stack overflow
 
 ## 0.1.1
-- [ ] `Switch` and `Case` components
+- [x] `Switch` and `Case` components
 - [x] Fix bug with multiline nested component attributes.
 - [ ] `Each` with `Map`
 - [ ] `Each` with children in addition to `render`

web-view-components/src/main/groovy/groowt/view/component/web/DefaultWebViewComponentScope.groovy

@@ -10,8 +10,11 @@ class DefaultWebViewComponentScope extends DefaultComponentScope implements WebV
 
     static DefaultWebViewComponentScope getDefaultRootScope() {
         new DefaultWebViewComponentScope().tap {
-            addWithAttr(Echo)
+            addWithAttr(Case)
+            addWithAttr(DefaultCase)
             addWithAttr(Each)
+            addWithAttr(Echo)
+            addWithAttr(Switch)
             addWithAttr(WhenNotEmpty)
             addWithAttr(WhenNotNull)
         }

web-view-components/src/main/groovy/groowt/view/component/web/lib/Case.groovy

@@ -0,0 +1,26 @@
+package groowt.view.component.web.lib
+
+import groowt.view.View
+import groowt.view.component.runtime.DefaultComponentWriter
+
+class Case extends DelegatingWebViewComponent {
+
+    private final Object match
+
+    Case(Map attr) {
+        match = attr.match
+    }
+
+    @Override
+    protected View getDelegate() {
+        return { Writer w ->
+            def parent = context.getParent(Switch)
+            if (!parent.doneYet && match == parent.item) {
+                parent.doneYet = true
+                def cw = new DefaultComponentWriter(w, context.renderContext, context)
+                children.each { cw << it }
+            }
+        }
+    }
+
+}

web-view-components/src/main/groovy/groowt/view/component/web/lib/DefaultCase.groovy

@@ -0,0 +1,20 @@
+package groowt.view.component.web.lib
+
+import groowt.view.View
+import groowt.view.component.runtime.DefaultComponentWriter
+
+class DefaultCase extends DelegatingWebViewComponent {
+
+    @Override
+    protected View getDelegate() {
+        return { Writer w ->
+            def parent = context.getParent(Switch)
+            if (!parent.doneYet) {
+                parent.doneYet = true
+                def cw = new DefaultComponentWriter(w, context.renderContext, context)
+                children.each { cw << it }
+            }
+        }
+    }
+
+}

web-view-components/src/main/groovy/groowt/view/component/web/lib/Switch.groovy

@@ -0,0 +1,23 @@
+package groowt.view.component.web.lib
+
+import groowt.view.View
+import groowt.view.component.runtime.DefaultComponentWriter
+
+class Switch extends DelegatingWebViewComponent {
+
+    final Object item
+    boolean doneYet
+
+    Switch(Map attr) {
+        item = attr.item
+    }
+
+    @Override
+    protected View getDelegate() {
+        return { Writer w ->
+            def cw = new DefaultComponentWriter(w, context.renderContext, context)
+            children.each { cw << it }
+        }
+    }
+
+}

web-view-components/src/test/groovy/groowt/view/component/web/lib/SwitchTests.groovy

@@ -0,0 +1,44 @@
+package groowt.view.component.web.lib
+
+import org.junit.jupiter.api.Test
+
+class SwitchTests extends AbstractWebViewComponentTests {
+
+    @Test
+    void smokeScreen() {
+        doTest('<Switch></Switch>', '')
+    }
+
+    @Test
+    void simpleCase() {
+        doTest(
+                '<Switch item="Hello"><Case match={"Hello"}>Hello, World!</Case></Switch>',
+                'Hello, World!'
+        )
+    }
+
+    @Test
+    void multipleCases() {
+        doTest('''
+                <Switch item='Mars'>
+                    <Case match='Jupiter'>Hello, Jupiter!</Case>
+                    <Case match='Mars'>Hello, Mars!</Case>
+                </Switch>
+                '''.trim(),
+                'Hello, Mars!'
+        )
+    }
+
+    @Test
+    void withDefaultCase() {
+        doTest('''
+                <Switch item='Not Mercury'>
+                    <Case match='Mercury'>Hello, Mercury!</Case>
+                    <DefaultCase>Hello, Not Mercury!</DefaultCase>
+                </Switch>
+                '''.trim(),
+                'Hello, Not Mercury!'
+        )
+    }
+
+}