014 abstract seam host facets

✓ Passing This code compiles and runs correctly.

Code

// Test: an abstract tor implemented by one proc per HOST — the portability
// seam. The same port (`greet`) carries a |zig body in this file and a |js
// body in the sibling input.kjs facet. Compiling to each target selects the
// host's implementation; the caller (below) is target-independent.
//
// This is the seam argument end-to-end: a contract the compiler sees, with
// per-host implementations chosen by target, zero runtime indirection.
//
// Zig lane: prints "Hello, Alice" via the |zig proc.
// JS lane:   prints "Hello, Alice" via the |js proc (from input.kjs).
// Both must match expected.txt — same contract, same observable behavior on
// both hosts.

const std = @import("std");

// The PORT — an abstract seam. One contract, one caller.
~[abstract] tor greet { name: string } -> string

// The HOST pattern: the same port implemented for each target.
~proc greet|zig {
    std.debug.print("Hello, {s}\n", .{name});
    return name;
}

// THE CALLER — addresses only the port. Target-independent.
~greet(name: "Alice")

input.kz

Supporting Files

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a_cs_equiv.deps.json

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a_cs_equiv.runtimeconfig.json

Hello, Alice

actual.cs.txt

// C# implementation facet: this port's C# host implementation. Merged at
// compile (sibling to input.kz); selected when the target is --lang=cs.
~proc greet|cs {
    __koru_stdout_write("Hello, " + name + "\n");
    return name;
}

input.kcs

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koru.csproj

//------------------------------------------------------------------------------
// <auto-generated>
//     This code was generated by a tool.
//
//     Changes to this file may cause incorrect behavior and will be lost if
//     the code is regenerated.
// </auto-generated>
//------------------------------------------------------------------------------

using System;
using System.Reflection;

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static class main_module {
  public static void __koru_stdout_write(dynamic s) => global::System.Console.Out.Write(s);
  public static void __koru_stderr_write(dynamic s) => global::System.Console.Error.Write(s);
  public static class greet_event {
    public struct Input {
      public string name;
    }
    public static string handler(Input __koru_input) {
      var name = __koru_input.name;
      __koru_stdout_write("Hello, " + name + "\n");
      return name;
    }
  }
  public static void flow0() {
    main_module.greet_event.handler(new greet_event.Input { name = "Alice"});
  }
}

static class Program {
  static void Main() {
    main_module.flow0();
  }
}

output_emitted.cs

Actual

Hello, Alice

Expected output

✓ Zig✓ JavaScript✓ C#

Hello, Alice

Flows

flow ~greet click a branch to expand · @labels scroll to their anchor

greet (name: "Alice")

Test Configuration

MUST_RUN LANGUAGES: zig js cs

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