Brandon Lucas
4eebaebb27
Add Schema module with functions for creating and migrating versioned values. This provides the runtime foundation for schema evolution. Schema module functions: - Schema.versioned(typeName, version, value) - create versioned value - Schema.migrate(value, targetVersion) - migrate to new version - Schema.getVersion(value) - get version number Changes: - Add Versioned, Migrate, GetVersion builtins to interpreter - Add Schema module to global environment - Add Schema module type to type environment - Add 4 tests for schema operations - Add examples/versioning.lux demonstrating usage Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>
36 lines
1.2 KiB
Plaintext
36 lines
1.2 KiB
Plaintext
// Demonstrating Schema Evolution in Lux
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//
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// Lux provides versioned types to help manage data evolution over time.
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// The Schema module provides functions for creating and migrating versioned values.
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//
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// Expected output:
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// Created user v1: Alice (age unknown)
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// User version: 1
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// Migrated to v2: Alice (age unknown)
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// User version after migration: 2
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// Create a versioned User value at v1
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fn createUserV1(name: String): Unit with {Console} = {
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let user = Schema.versioned("User", 1, { name: name })
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let version = Schema.getVersion(user)
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Console.print("Created user v1: " + name + " (age unknown)")
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Console.print("User version: " + toString(version))
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}
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// Migrate a user to v2
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fn migrateUserToV2(name: String): Unit with {Console} = {
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let userV1 = Schema.versioned("User", 1, { name: name })
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let userV2 = Schema.migrate(userV1, 2)
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let newVersion = Schema.getVersion(userV2)
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Console.print("Migrated to v2: " + name + " (age unknown)")
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Console.print("User version after migration: " + toString(newVersion))
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}
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// Main
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fn main(): Unit with {Console} = {
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createUserV1("Alice")
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migrateUserToV2("Alice")
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}
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let output = run main() with {}
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