fix: when/else parentNode null guard for slot context + match parser boundaries + showcase demo

- When/else inside slots: anchor parentNode is null during initial effect
  Fixed with named effect function + requestAnimationFrame retry
- Match parser now terminates on ] } else tokens (works inside containers)
- Updated Progress/Badge components
- Added examples/showcase.ds: 5-section demo exercising all features

compiler/ds-codegen/src/js_emitter.rs

@@ -761,8 +761,14 @@ impl JsEmitter {
                     None
                 };
 
-                self.emit_line("DS.effect(() => {");
+                let effect_fn = format!("_when_{}", anchor_var);
+                self.emit_line(&format!("DS.effect(function {}() {{", effect_fn));
                 self.indent += 1;
+                // Guard: if anchor not yet in DOM (e.g. inside slot DocumentFragment), defer
+                self.emit_line(&format!(
+                    "if (!{}.parentNode) {{ requestAnimationFrame(() => DS.effect({})); return; }}",
+                    anchor_var, effect_fn
+                ));
                 self.emit_line(&format!("const show = {};", cond_js));
 
                 // Show when: condition true and not already showing

compiler/ds-parser/src/parser.rs

@@ -921,10 +921,12 @@ impl Parser {
                 self.skip_newlines();
                 let mut arms = Vec::new();
                 while !self.is_at_end()
-                    && !matches!(self.peek(), TokenKind::Let | TokenKind::View | TokenKind::On | TokenKind::Effect)
+                    && !matches!(self.peek(), TokenKind::Let | TokenKind::View | TokenKind::On | TokenKind::Effect
+                        | TokenKind::RBracket | TokenKind::RBrace | TokenKind::Else | TokenKind::Eof)
                 {
                     self.skip_newlines();
-                    if self.is_at_end() || matches!(self.peek(), TokenKind::Let | TokenKind::View | TokenKind::On | TokenKind::Effect) {
+                    if self.is_at_end() || matches!(self.peek(), TokenKind::Let | TokenKind::View | TokenKind::On | TokenKind::Effect
+                        | TokenKind::RBracket | TokenKind::RBrace | TokenKind::Else | TokenKind::Eof) {
                         break;
                     }
                     let pattern = self.parse_pattern()?;

examples/showcase.ds

@@ -1,45 +1,73 @@
--- DreamStack Component Showcase
--- Demonstrates all component styles via variant prop
+-- DreamStack Showcase
+-- Demonstrates: imports, slots, when/else, each, match, reactive state
+
+import { Card } from "../registry/components/card"
+import { Badge } from "../registry/components/badge"
 
--- State
-let name = ""
 let count = 0
+let loggedIn = false
+let mood = "happy"
+let items = ["Alpha", "Beta", "Gamma", "Delta"]
 
--- Main view  
 view main = column [
+  -- Header
+  text "🚀 DreamStack Showcase" { variant: "title" }
+  text "Everything working together" { variant: "subtitle" }
 
-  text "🧩 DreamStack Components" { variant: "title" }
-  text "shadcn-inspired component registry" { variant: "subtitle" }
-
-  -- Button Variants
-  text "Button Variants" { variant: "title" }
-  row [
-    button "Primary" { variant: "primary" }
-    button "Secondary" { variant: "secondary" }
-    button "Ghost" { variant: "ghost" }
-    button "Destructive" { variant: "destructive" }
+  -- 1. Slot Composition: Card with interactive children
+  Card { title: "Interactive Counter", subtitle: "slot composition + reactivity" } [
+    text "Count: {count}" { variant: "title" }
+    row [
+      button "-1" { click: count -= 1, variant: "secondary" }
+      button "+1" { click: count += 1, variant: "primary" }
+      button "Reset" { click: count = 0, variant: "ghost" }
+    ]
   ]
 
-  -- Badge Variants  
-  text "Badge Variants" { variant: "title" }
-  row [
-    text "SUCCESS" { variant: "success" }
-    text "WARNING" { variant: "warning" }  
-    text "ERROR" { variant: "error" }
-    text "INFO" { variant: "info" }
-    text "DEFAULT" { variant: "default" }
+  -- 2. When/Else: Conditional rendering
+  Card { title: "Auth Status", subtitle: "when/else branching" } [
+    button "Toggle Login" { click: loggedIn = !loggedIn, variant: "primary" }
+    when loggedIn ->
+      row [
+        Badge { label: "ONLINE", variant: "success" }
+        text "Welcome back, admin!"
+      ]
+    else ->
+      row [
+        Badge { label: "OFFLINE", variant: "error" }
+        text "Please log in to continue"
+      ]
   ]
 
-  -- Input with live binding
-  text "Input Component" { variant: "title" }
-  text "Name" { variant: "label" }
-  input { bind: name, placeholder: "Type your name..." }
-  text "Hello, {name}!"
+  -- 3. Match: Pattern matching on state
+  Card { title: "Mood Selector", subtitle: "match expressions" } [
+    row [
+      button "😊 Happy" { click: mood = "happy", variant: "primary" }
+      button "😢 Sad" { click: mood = "sad", variant: "secondary" }
+      button "😡 Angry" { click: mood = "angry", variant: "ghost" }
+    ]
+    match mood
+      "happy" -> text "You're feeling great! 🌟" { variant: "success" }
+      "sad" -> text "Hang in there... 💙" { variant: "info" }
+      "angry" -> text "Take a deep breath 🔥" { variant: "warning" }
+      _ -> text "How are you?" { variant: "subtitle" }
+  ]
 
-  -- Interactive counter
-  text "Interactive Counter" { variant: "title" }
-  row [
-    button "Count: {count}" { click: count += 1, variant: "primary" }
-    button "Reset" { click: count = 0, variant: "ghost" }
+  -- 4. Each: List rendering
+  Card { title: "Team Members", subtitle: "each loop iteration" } [
+    each item in items ->
+      row [
+        text "→"
+        text item
+      ]
+  ]
+
+  -- 5. Nested Features: when/else inside Card slot inside each
+  Card { title: "Feature Matrix", subtitle: "nested composition" } [
+    text "Count is {count}"
+    when count > 5 ->
+      Badge { label: "HIGH", variant: "warning" }
+    else ->
+      Badge { label: "LOW", variant: "info" }
   ]
 ]

registry/components/badge.ds

@@ -1,5 +1,6 @@
 -- DreamStack Badge Component
+-- Small label with colored background
 -- Variants: success, warning, error, info, default
 
 export component Badge(label, variant) =
-  text label { variant: "default" }
+  text label { variant: variant }

registry/components/progress.ds

@@ -1,7 +1,13 @@
 -- DreamStack Progress Component
--- Animated progress bar with percentage
+-- Animated progress bar with percentage display
 
-export component Progress(value) =
+export component Progress(value, label) =
   column [
-    text "{value}%"
+    row [
+      text label { variant: "label" }
+      text "{value}%" { variant: "label" }
+    ]
+    column [
+      column [] { variant: "progress-fill", style: "width: {value}%" }
+    ] { variant: "progress-track" }
   ]