Custom Dialect Fast Invocation

A custom .wistdialect file uses the same canonical facade and runtime as shipped presets. There is no separate custom-dialect runtime host.

Create from a dialect file

using UniversalToolchain.Wist;

using var wist = WistEngine.Create(new WistEngineOptions
{
    DialectSource = WistDialectSource.FromFile("my-language.wistdialect"),
    BackendId = "cil"
});

WistFacadeLanguageDefinitionFactory translates the dialect configuration into LanguageDefinition; LanguageCompiler remains the sole dependency/provider/order authority and produces the immutable LanguagePlan consumed by LanguageRuntime.

Compile once

Use a delegate whose parameter list exactly matches the declared formula parameters:

var formula = wist.Compile<Func<double, double, double, double>>(
    "price * factor + fee",
    "price",
    "factor",
    "fee");

for (var i = 0; i < 1000; i++)
{
    double result = formula.CompiledDelegate(100.0, 0.9, 5.0);
}

The compiled program is reusable. Do not rebuild a language plan or rediscover runtime components per invocation.

Interpreter custom dialect

Set BackendId = "interpreter" when the dialect enables it. The selected backend still comes from the typed plan; changing loaded assemblies or runtime-manifest files cannot switch the backend after planning.

Boundary

Runtime-manifest emission metadata may exist for tooling/package inspection, but custom-dialect execution must not depend on a reflection catalog, service locator, manual DLL copying or a second manifest planner.