switch

jael/lib/src/renderer.dart

@@ -46,6 +46,9 @@ class Renderer {
     } else if (element.tagName.name == 'declare') {
       renderDeclare(element, buffer, childScope, html5);
       return;
+    } else if (element.tagName.name == 'switch') {
+      renderSwitch(element, buffer, childScope, html5);
+      return;
     }
 
     buffer..write('<')..write(element.tagName.name);
@@ -161,7 +164,8 @@ class Renderer {
     renderElement(strippedElement, buffer, scope, html5);
   }
 
-  void renderDeclare(Element element, CodeBuffer buffer, SymbolTable scope, bool html5) {
+  void renderDeclare(
+      Element element, CodeBuffer buffer, SymbolTable scope, bool html5) {
     for (var attribute in element.attributes) {
       scope.add(attribute.name,
           value: attribute.value?.compute(scope), constant: true);
@@ -174,6 +178,43 @@ class Renderer {
     }
   }
 
+  void renderSwitch(
+      Element element, CodeBuffer buffer, SymbolTable scope, bool html5) {
+    var value = element.attributes
+        .firstWhere((a) => a.name == 'value', orElse: () => null)
+        ?.value
+        ?.compute(scope);
+
+    var cases =
+        element.children.where((c) => c is Element && c.tagName.name == 'case');
+
+    for (Element child in cases) {
+      var comparison = child.attributes
+          .firstWhere((a) => a.name == 'value', orElse: () => null)
+          ?.value
+          ?.compute(scope);
+      if (comparison == value) {
+        for (int i = 0; i < child.children.length; i++) {
+          var c = child.children.elementAt(i);
+          renderElementChild(c, buffer, scope, html5, i, child.children.length);
+        }
+
+        return;
+      }
+    }
+
+    Element defaultCase = element.children.firstWhere(
+        (c) => c is Element && c.tagName.name == 'default',
+        orElse: () => null);
+    if (defaultCase != null) {
+      for (int i = 0; i < defaultCase.children.length; i++) {
+        var child = defaultCase.children.elementAt(i);
+        renderElementChild(
+            child, buffer, scope, html5, i, defaultCase.children.length);
+      }
+    }
+  }
+
   void renderElementChild(ElementChild child, CodeBuffer buffer,
       SymbolTable scope, bool html5, int index, int total) {
     if (child is Text) {

jael/pubspec.yaml

@@ -1,5 +1,5 @@
 name: jael
-version: 1.0.0-alpha+4
+version: 1.0.0-alpha+5
 description:  A simple server-side HTML templating engine for Dart.
 author: Tobe O <thosakwe@gmail.com>
 homepage: https://github.com/angel-dart/jael/tree/master/jael

jael/test/render/render_test.dart

@@ -266,6 +266,60 @@ main() {
 '''
             .trim());
   });
+
+  test('switch', () {
+    const template = '''
+<switch value=account.isDisabled>
+  <case value=true>
+    BAN HAMMER LOLOL
+  </case>
+  <case value=false>
+    You are in good standing.
+  </case>
+  <default>
+    Weird...
+  </default>
+</switch>
+''';
+
+    var buf = new CodeBuffer();
+    var document = jael.parseDocument(template, sourceUrl: 'test.jl');
+    var scope = new SymbolTable(values: {
+      'account': new _Account(isDisabled: true),
+    });
+
+    const jael.Renderer().render(document, buf, scope);
+    print(buf);
+
+    expect(buf.toString().trim(), 'BAN HAMMER LOLOL');
+  });
+
+  test('default', () {
+    const template = '''
+<switch value=account.isDisabled>
+  <case value=true>
+    BAN HAMMER LOLOL
+  </case>
+  <case value=false>
+    You are in good standing.
+  </case>
+  <default>
+    Weird...
+  </default>
+</switch>
+''';
+
+    var buf = new CodeBuffer();
+    var document = jael.parseDocument(template, sourceUrl: 'test.jl');
+    var scope = new SymbolTable(values: {
+      'account': new _Account(isDisabled: null),
+    });
+
+    const jael.Renderer().render(document, buf, scope);
+    print(buf);
+
+    expect(buf.toString().trim(), 'Weird...');
+  });
 }
 
 const List<_Pokemon> starters = const [
@@ -279,3 +333,9 @@ class _Pokemon {
 
   const _Pokemon(this.name, this.type);
 }
+
+class _Account {
+  final bool isDisabled;
+
+  _Account({this.isDisabled});
+}