ridl-syntax 0.4.0

The RIDL family lexer and grammar: a lossless concrete syntax tree over rowan.
Documentation 
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package veh.cluster

import veh.common.Speed
import veh.common.Temperature
import veh.common.MAX_SPEED
import veh.common.GearPosition
import veh.common.WarningFlags

// --- vocabulary local to this contract (typl declarations, package level) ---

struct DoorPayload {
  sensorId : integer [0..15]
  isOpen   : boolean
}

struct DiagFilter {
  severity : integer [0..5]
  category : Label?
}

struct FaultEvent {
  code      : integer [0..65535]
  message   : Message
  timestamp : Timestamp
}

error enum DiagError {           // failure vocabulary — typl §10.1
  FILTER_INVALID   = 0
  STORAGE_BUSY     = 1
  ACCESS_DENIED    = 2
}

struct FaultPage {
  faults : [FaultEvent; 0..64]
}

// --- the contract ---

/**
 * Main vehicle status interface.
 * @labels SIL_B, CAL_2, PRIVATE
 */
interface VehicleStatus {

  /// Current vehicle speed — isochronous, drives rmdl clocks downstream
  signal currentSpeed : Speed @10ms

  /// Engine temperature — change-driven, 100ms freshness SLO
  signal engineTemp : Temperature @[20ms..100ms]

  /// Active warnings — last-value delivered on subscribe (§4.4)
  signal warnings : WarningFlags @[50ms..1s]

  /// Raised on every door state change; stale after 500ms
  event doorOpened : DoorPayload @[50ms..500ms]

  /// Request a gear change — outcome observed via currentGear, not returned
  command setGear(position: GearPosition) [
    require position != GearPosition.PARK || currentSpeed == 0.0
  ]

  reserved resetCounters          // retired ordinal — never reused

  /// Sliding-window average
  query getAverageSpeed(window: Duration): Speed [
    require window > 0ms
    ensure  result >= 0.0
  ]

  /// Fault history as a finite stream
  query streamFaults(filter: DiagFilter): <FaultEvent>

  /// Paged fault snapshot — fallible query via inline `T | E` (§10.1)
  query getFaultPage(filter: DiagFilter): FaultPage | DiagError

  fixed softwareVersion : Version
  fixed capabilities    : [Label; 0..32]
}