Crate proef_core 

Engine-agnostic core of proef, the declarative multi-engine e2e test runner.

This crate owns the full front-end pipeline (gherkin parse → bind → lower → emit), the engine seam (engine::EngineFactory / engine::EngineSession, ADR-0002), the world::World variable scope (ADR-0005), the serde event::Event spine (ADR-0008), and the fault taxonomy with stable exit codes (ADR-0009).

Core purity (sans-IO lite)

The pipeline stages in this crate do no IO, read no clocks or environment, and generate no randomness — run_id, timestamps, and env snapshots are injected values. The single sanctioned persistence component is world::GlobalStore, whose load/save functions are invoked only from the orchestrating edge (the CLI), never from pipeline code. This is what makes snapshot and property tests bit-deterministic; do not break it for convenience.

Modules

bind

Step binding (TECH-SPEC §4.3): match each authored step against the loaded macros’ match: patterns.

cancel

Cooperative cancellation plumbing (ADR-0007).

diag

Source-located diagnostics with stable codes (ADR-0009, TECH-SPEC §9).

emit

Canonical artifact emission (ADR-0010, TECH-SPEC §4.5).

engine

The engine seam (ADR-0002): EngineFactory / EngineSession, step-kind routing, and capability hooks (step_kinds, doctor).

error

Fault taxonomy and stable exit codes (ADR-0009).

event

The serde event spine (ADR-0008).

fake

Deterministic synthetic data for ${fake:*} (ADR-0005).

feature

Feature front end (TECH-SPEC §4.2, §4.4, §7): gherkin parse, # key: value directives, tag accumulation, Background prepending, Rule pass-through, Scenario Outline expansion, and data-table capture.

lower

Lowering (TECH-SPEC §4.4): bound scenarios → engine batches.

matcher

The {name} step matcher: cucumber-expression-style patterns binding Gherkin prose to macros (TECH-SPEC §4.3).

pack

Macro packs: the YAML binding skeleton with embedded raw payload blocks (ADR-0004, TECH-SPEC §6).

report

Reporters (ADR-0008): composable consumers of the event spine.

resolve

Author-time ${…} variable resolution (ADR-0005, TECH-SPEC §8).

runner

The run orchestrator (TECH-SPEC §1, §12; ADR-0007): scenario-per-OS-thread, --jobs-bounded, cooperative cancellation at batch boundaries, and a heartbeat watchdog that abandons over-budget scenario threads (recording a System failure and detaching — the process reaps them at exit).

step

Lowered, engine-agnostic step and batch types (TECH-SPEC §3).

world

Typed variable scope and persistent global store (ADR-0005).