Crate flow_ir_core 

flow.ir Pure Rust schema + sync interpreter.

3 Node kinds (Step / Seq / Branch) + Fanout / Loop / Try + 3 Expr ops (Path / Lit / Eq) + sync eval + Dispatcher trait + Path read/write.

mlua / futures / async 依存ゼロ。 async runtime + mlua binding は上流 mlua-flow-ir crate が担当する 4 層 stack の core 層。

Quick start

use flow_ir_core::{eval, Dispatcher, EvalError, Expr, Node};
use serde_json::{json, Value};

let node: Node = serde_json::from_value(json!({
    "kind": "step",
    "ref": "uppercase",
    "in": { "op": "path", "at": "$.input" },
    "out": { "op": "path", "at": "$.output" },
})).unwrap();

struct Fixture;
impl Dispatcher for Fixture {
    fn dispatch(&self, _r: &str, input: Value) -> Result<Value, EvalError> {
        if let Value::String(s) = input {
            Ok(Value::String(s.to_uppercase()))
        } else {
            Ok(input)
        }
    }
}

let out = eval(&node, json!({ "input": "hello" }), &Fixture).unwrap();
assert_eq!(out, json!({ "input": "hello", "output": "HELLO" }));

Enums

EvalError

Evaluation error.

Expr

flow.ir Expr op.

JoinMode

Fanout join semantics (Promise / futures combinators).

Node

flow.ir Node kind.

Traits

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_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)。

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.