052 interpreter identity result

// Test: Interpreter identity branch constructor (result s) and discard (_)

~import "$std/runtime"
~import "$std/interpreter"
~import "$std/io"

const std = @import("std");

// Event with identity branch payload
~pub event add { a: i64, b: i64 }
| sum i64

~add = sum a + b

~std.runtime:register(scope: "test") {
    add
}

const TEST_SOURCE_IDENTITY =
    \\~add(a: 3, b: 4)
    \\| sum s |> result s
;

const TEST_SOURCE_BRANCH =
    \\~add(a: 3, b: 4)
    \\| sum s |> result s.Branch
;

const TEST_SOURCE_DISCARD =
    \\~add(a: 3, b: 4)
    \\| sum s |> _
;

~std.runtime:get_scope(name: "test")
| scope s |> std.interpreter:run(source: TEST_SOURCE_IDENTITY, dispatcher: s.dispatcher)
    | result r |> std.io:print.ln("IDENTITY {{ r.value.toJsonBuf():s }}")
    | exhausted e |> std.io:print.ln("EXHAUSTED: {{ e.last_event:s }}")
    | parse_error e |> std.io:print.ln("PARSE ERROR: {{ e.message:s }}")
    | validation_error e |> std.io:print.ln("VALIDATION ERROR: {{ e.message:s }}")
    | dispatch_error e |> std.io:print.ln("DISPATCH ERROR: {{ e.message:s }}")
| not_found |> std.io:print.ln("SCOPE NOT FOUND")

~std.runtime:get_scope(name: "test")
| scope s |> std.interpreter:run(source: TEST_SOURCE_BRANCH, dispatcher: s.dispatcher)
    | result r |> std.io:print.ln("BRANCH {{ r.value.toJsonBuf():s }}")
    | exhausted e |> std.io:print.ln("EXHAUSTED: {{ e.last_event:s }}")
    | parse_error e |> std.io:print.ln("PARSE ERROR: {{ e.message:s }}")
    | validation_error e |> std.io:print.ln("VALIDATION ERROR: {{ e.message:s }}")
    | dispatch_error e |> std.io:print.ln("DISPATCH ERROR: {{ e.message:s }}")
| not_found |> std.io:print.ln("SCOPE NOT FOUND")

~std.runtime:get_scope(name: "test")
| scope s |> std.interpreter:run(source: TEST_SOURCE_DISCARD, dispatcher: s.dispatcher)
    | result r |> std.io:print.ln("DISCARD {{ r.value.branch:s }}")
    | exhausted e |> std.io:print.ln("EXHAUSTED: {{ e.last_event:s }}")
    | parse_error e |> std.io:print.ln("PARSE ERROR: {{ e.message:s }}")
    | validation_error e |> std.io:print.ln("VALIDATION ERROR: {{ e.message:s }}")
    | dispatch_error e |> std.io:print.ln("DISPATCH ERROR: {{ e.message:s }}")
| not_found |> std.io:print.ln("SCOPE NOT FOUND")