Brandon Lucas
705bd57e81
Documentation: - Update IMPLEMENTATION_PLAN.md with current status (222 tests) - Update feature comparison table (Schema Evolution, Behavioral Types: ✅) - Add HttpServer to built-in effects list - Update OVERVIEW.md with working behavioral types examples Demo Programs: - examples/schema_evolution.lux - Version annotations, constraints, runtime ops - examples/behavioral_types.lux - pure, deterministic, commutative, idempotent, total Sample Project: - projects/rest-api/ - Full REST API demo with: - Task CRUD endpoints - Pattern matching router - JSON serialization - Effect-tracked request handling Tests: - Add behavioral type tests (pure, deterministic, commutative, idempotent, total) - 227 tests passing Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>
99 lines
3.5 KiB
Plaintext
99 lines
3.5 KiB
Plaintext
// Schema Evolution Demo
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// Demonstrates version tracking in the type system
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// ============================================================
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// PART 1: Basic Version Annotations
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// ============================================================
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// Functions can require specific versions of data
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fn processV1Data(value: Int @v1): Int = value * 2
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fn processV2Data(value: Int @v2): Int = value * 3
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// Version-annotated values
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let dataV1: Int @v1 = 100
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let dataV2: Int @v2 = 100
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// These work - versions match
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let resultV1 = processV1Data(dataV1) // 200
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let resultV2 = processV2Data(dataV2) // 300
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// ============================================================
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// PART 2: Version Constraints
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// ============================================================
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// @v2+ means "version 2 or later"
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fn processModernData(value: Int @v2+): Int = value + 1
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// This works - v2 satisfies v2+
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let modernResult = processModernData(dataV2)
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// @latest means "compatible with any version"
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fn processAnyVersion(value: Int @latest): Int = value
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// This works - @latest accepts any version
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let anyResult = processAnyVersion(dataV1)
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// ============================================================
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// PART 3: Runtime Schema Operations
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// ============================================================
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// Create versioned values at runtime
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let user1 = Schema.versioned("User", 1, { name: "Alice", role: "admin" })
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let user2 = Schema.versioned("User", 2, { name: "Bob", role: "user", active: true })
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// Check versions
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let v1 = Schema.getVersion(user1) // 1
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let v2 = Schema.getVersion(user2) // 2
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// Migrate to newer version (upgrade)
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let upgraded = Schema.migrate(user1, 2)
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let upgradedVersion = Schema.getVersion(upgraded) // 2
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// ============================================================
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// PART 4: Practical Example - API Versioning
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// ============================================================
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// Simulate different API response versions
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fn createResponseV1(data: String): { version: Int, payload: String } =
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{ version: 1, payload: data }
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fn createResponseV2(data: String, timestamp: Int): { version: Int, payload: String, meta: { ts: Int } } =
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{ version: 2, payload: data, meta: { ts: timestamp } }
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// Version-aware processing
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fn getPayload(response: { version: Int, payload: String }): String =
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response.payload
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let resp1 = createResponseV1("Hello")
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let resp2 = createResponseV2("World", 1234567890)
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let payload1 = getPayload(resp1)
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let payload2 = getPayload(resp2)
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// ============================================================
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// RESULTS
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// ============================================================
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fn main(): Unit with {Console} = {
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Console.print("=== Schema Evolution Demo ===")
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Console.print("")
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Console.print("Part 1: Version-specific processing")
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Console.print(" processV1Data(100 @v1) = " + toString(resultV1))
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Console.print(" processV2Data(100 @v2) = " + toString(resultV2))
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Console.print("")
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Console.print("Part 2: Version constraints")
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Console.print(" processModernData(@v2+) = " + toString(modernResult))
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Console.print(" processAnyVersion(@latest) = " + toString(anyResult))
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Console.print("")
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Console.print("Part 3: Runtime schema operations")
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Console.print(" User v1 version: " + toString(v1))
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Console.print(" User v2 version: " + toString(v2))
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Console.print(" After upgrade: " + toString(upgradedVersion))
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Console.print("")
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Console.print("Part 4: API versioning")
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Console.print(" Response v1 payload: " + payload1)
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Console.print(" Response v2 payload: " + payload2)
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}
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main()
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