dreamstack/examples/language-features.ds

-- DreamStack Language Features Test
-- Exercises all core language features in one place
-- Tests: operators, assignment ops, array methods, computed signals, 
--        when/else, match, each, method calls, string interpolation

import { Card } from "../registry/components/card"
import { Badge } from "../registry/components/badge"
import { Button } from "../registry/components/button"

-- State
let count = 10
let items = ["Alpha", "Beta", "Gamma"]
let loggedIn = false
let mode = "normal"

-- Computed signals (derived)
let doubled = count * 2
let isHigh = count > 50

view test = column [

  text "🧪 Language Features" { variant: "title" }
  text "Testing all operators and methods" { variant: "subtitle" }

  -- 1. All assignment operators: +=, -=, *=, /=
  Card { title: "Assignment Operators", subtitle: "+= -= *= /=" } [
    text "count: {count} | doubled: {doubled}" { variant: "title" }
    row [
      Button { label: "+5", variant: "primary", onClick: count += 5 }
      Button { label: "-3", variant: "secondary", onClick: count -= 3 }
      Button { label: "×2", variant: "primary", onClick: count *= 2 }
      Button { label: "÷2", variant: "secondary", onClick: count /= 2 }
      Button { label: "=1", variant: "ghost", onClick: count = 1 }
    ]
  ]

  -- 2. Boolean operators && || !
  Card { title: "Boolean Logic", subtitle: "&& || ! operators" } [
    Button { label: "Toggle Login", variant: "primary", onClick: loggedIn = !loggedIn }
    when loggedIn ->
      Badge { label: "Logged In ✓", variant: "success" }
    else ->
      Badge { label: "Logged Out", variant: "error" }
  ]

  -- 3. Array methods: push, pop, clear, sort, reverse
  Card { title: "Array Methods", subtitle: "push pop clear sort reverse" } [
    text "Items: {items}" { variant: "title" }
    text "{items}" { variant: "subtitle" }
    row [
      Button { label: "Push", variant: "primary", onClick: items.push("New") }
      Button { label: "Pop", variant: "secondary", onClick: items.pop() }
      Button { label: "Sort", variant: "ghost", onClick: items.sort() }
      Button { label: "Reverse", variant: "ghost", onClick: items.reverse() }
      Button { label: "Clear", variant: "destructive", onClick: items.clear() }
    ]
    each item in items ->
      row [
        text "→"
        text item
      ]
  ]

  -- 4. Match expressions
  Card { title: "Pattern Matching", subtitle: "match with fall-through" } [
    row [
      Button { label: "Normal", variant: "secondary", onClick: mode = "normal" }
      Button { label: "Turbo", variant: "primary", onClick: mode = "turbo" }
      Button { label: "Zen", variant: "ghost", onClick: mode = "zen" }
    ]
    match mode
      "turbo" -> Badge { label: "🔥 TURBO", variant: "warning" }
      "zen" -> Badge { label: "🧘 ZEN", variant: "info" }
      _ -> Badge { label: "📝 Normal", variant: "default" }
  ]

  -- 5. Comparison operators
  Card { title: "Comparisons", subtitle: "> < >= <= == !=" } [
    text "count = {count}"
    when count > 50 -> Badge { label: "HIGH (>50)", variant: "warning" }
    when count > 20 -> Badge { label: "MEDIUM (>20)", variant: "info" }
    else -> Badge { label: "LOW (≤20)", variant: "success" }
  ]
]