Crate mlua_flow_ir 

flow.ir async runtime + mlua binding.

Layer 3 of the 4-layer flow.ir stack:

1. flow-ir-lua — Pure Lua DSL (separate repo, ecosystem-neutral)
2. flow-ir-core — Pure Rust schema + sync interpreter (no mlua, no async)
3. mlua-flow-ir — this crate: re-export of flow-ir-core + AsyncDispatcher + eval_async + fanout_eval + Lua module() binding
4. mlua-swarm-engine — host concerns (Spawner / Worker / Loop / AuthzPolicy / cp_state persist)

All schema types (Node / Expr / JoinMode / EvalError / Dispatcher) are re-exported verbatim from flow-ir-core so callers can keep a single import path:

use mlua_flow_ir::{eval, eval_async, AsyncDispatcher, Dispatcher, EvalError, Expr, Node};

Enums

EvalError

Evaluation error.

Expr

flow.ir Expr op.

JoinMode

Fanout join semantics (Promise / futures combinators).

Node

flow.ir Node kind.

Traits

AsyncDispatcher

Async dispatcher trait — async 版 Dispatcher。

Dispatcher

Dispatcher callback: resolves a Step.ref against the provided input, returns the step’s raw output value.

Functions

eval

Evaluate a Node against a context value, using the given dispatcher for Step resolution.

eval_async

Evaluate a Node against a context value asynchronously, using the given async dispatcher for Step resolution.

eval_expr

Evaluate an Expr against a context value, returning the resolved JSON value.

is_truthy

JSON value の truthy 判定 (= flow.ir Branch cond / Loop cond で使う)。 Bool は値そのまま、 null/false 以外は truthy (Lua / JS と整合)。

module

Register the flow module table with Lua.

read_path

Read a path from a JSON value. Supports simple $.a.b.c form.

write_path

Write a value at the path location inside ctx, returning the updated ctx. out must be a Path Expr.