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Add event handler #366
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Add event handler #366
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3cf7dfb
Remove experimental protectedMode option.
davidlehn 32f481a
Add event handler.
davidlehn e84e691
Use events for language value warnings.
davidlehn 0478801
Change handleEvent option to eventHandler.
davidlehn 1ebcc1f
Use object spread.
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,92 @@ | ||
| /* | ||
| * Copyright (c) 2020 Digital Bazaar, Inc. All rights reserved. | ||
| */ | ||
| 'use strict'; | ||
|
|
||
| const JsonLdError = require('./JsonLdError'); | ||
|
|
||
| const { | ||
| isArray: _isArray | ||
| } = require('./types'); | ||
|
|
||
| const { | ||
| asArray: _asArray | ||
| } = require('./util'); | ||
|
|
||
| const api = {}; | ||
| module.exports = api; | ||
|
|
||
| /** | ||
| * Handle an event. | ||
| * | ||
| * Top level APIs have a common 'eventHandler' option. This option can be a | ||
| * function, array of functions, object mapping event.code to functions (with a | ||
| * default to call next()), or any combination of such handlers. Handlers will | ||
| * be called with an object with an 'event' entry and a 'next' function. Custom | ||
| * handlers should process the event as appropriate. The 'next()' function | ||
| * should be called to let the next handler process the event. | ||
| * | ||
| * The final default handler will use 'console.warn' for events of level | ||
| * 'warning'. | ||
| * | ||
| * @param {object} event - event structure: | ||
| * {string} code - event code | ||
| * {string} level - severity level, one of: ['warning'] | ||
| * {string} message - human readable message | ||
| * {object} details - event specific details | ||
| * @param {object} options - processing options | ||
| */ | ||
| api.handleEvent = ({ | ||
| event, | ||
| options | ||
| }) => { | ||
| const handlers = [].concat( | ||
| options.eventHandler ? _asArray(options.eventHandler) : [], | ||
| _defaultHandler | ||
| ); | ||
| _handle({event, handlers}); | ||
| }; | ||
|
|
||
| function _handle({event, handlers}) { | ||
| let doNext = true; | ||
| for(let i = 0; doNext && i < handlers.length; ++i) { | ||
| doNext = false; | ||
| const handler = handlers[i]; | ||
| if(_isArray(handler)) { | ||
| doNext = _handle({event, handlers: handler}); | ||
| } else if(typeof handler === 'function') { | ||
| handler({event, next: () => { | ||
| doNext = true; | ||
| }}); | ||
| } else if(typeof handler === 'object') { | ||
| if(event.code in handler) { | ||
| handler[event.code]({event, next: () => { | ||
| doNext = true; | ||
| }}); | ||
| } else { | ||
| doNext = true; | ||
| } | ||
| } else { | ||
| throw new JsonLdError( | ||
| 'Invalid event handler.', | ||
| 'jsonld.InvalidEventHandler', | ||
| {event}); | ||
| } | ||
| } | ||
| return doNext; | ||
| } | ||
|
|
||
| function _defaultHandler({event}) { | ||
| if(event.level === 'warning') { | ||
| console.warn(`WARNING: ${event.message}`, { | ||
| code: event.code, | ||
| details: event.details | ||
| }); | ||
| return; | ||
| } | ||
| // fallback to ensure events are handled somehow | ||
| throw new JsonLdError( | ||
| 'No handler for event.', | ||
| 'jsonld.UnhandledEvent', | ||
| {event}); | ||
| } |
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What's an example where this would match? Looks like the above checks wouldn't allow
{"@reverse": "@foo"}or similar to get this far.There was a problem hiding this comment.
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Previous checks don't specifically look at
@reverse, except to verify that it's a string.There was a problem hiding this comment.
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It checks it's a string,
_expandIrisit, then_isAbsoluteIrichecks that. Seems like a keyword like string wouldn't get beyond those steps. Is there an example where it would?There was a problem hiding this comment.
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Just created w3c/json-ld-api#389, as the order of checks was inverted.