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100 lines
2.0 KiB
CoffeeScript
100 lines
2.0 KiB
CoffeeScript
###*
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Definition of the Verb class.
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@module verbs/verb
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@license MIT. See LICENSE.md for details.
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###
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EVENTS = require 'events'
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HMEVENT = require '../core/event-codes'
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Promise = require 'pinkie-promise'
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###*
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An abstract invokable verb.
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Provides base class functionality for verbs. Provide common services such as
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error handling, event management, and promise support.
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@class Verb
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###
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module.exports = class Verb
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###* Constructor. Automatically called at creation. ###
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constructor: ( @moniker, @workhorse ) ->
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@emitter = new EVENTS.EventEmitter()
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return
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###* Invoke the command. ###
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invoke: ->
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# Sent the 'begin' notification for this verb
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@stat HMEVENT.begin, cmd: @moniker
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# Prepare command arguments
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argsArray = Array::slice.call arguments
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# Create a promise for this verb instance
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that = @
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@promise = new Promise (res, rej) ->
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that.resolve = res
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that.reject = rej
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that.workhorse.apply that, argsArray
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return
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###* Forward subscriptions to the event emitter. ###
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on: -> @emitter.on.apply @emitter, arguments
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###* Fire an arbitrary event, scoped to "hmr:". ###
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fire: (evtName, payload) ->
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payload = payload || { }
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payload.cmd = @moniker
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@emitter.emit 'hmr:' + evtName, payload
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true
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###* Handle an error condition. ###
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err: ( errorCode, payload, hot ) ->
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payload = payload || { }
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payload.sub = payload.fluenterror = errorCode
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payload.throw = hot
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@setError errorCode, payload
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if payload.quit
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@reject errorCode
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@fire 'error', payload
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if hot
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throw payload
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true
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###* Fire the 'hmr:status' error event. ###
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stat: ( subEvent, payload ) ->
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payload = payload || { }
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payload.sub = subEvent
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@fire 'status', payload
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true
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###* Has an error occurred during this verb invocation? ###
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hasError: -> @errorCode || @errorObj
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###* Associate error info with the invocation. ###
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setError: ( code, obj ) ->
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@errorCode = code
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@errorObj = obj
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return
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