/
action_descriptor.ts
75 lines (64 loc) · 1.98 KB
/
action_descriptor.ts
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export interface ActionDescriptor {
eventTarget: EventTarget
eventOptions: AddEventListenerOptions
eventName: string
identifier: string
methodName: string
}
export type ActionDescriptorFilters = Record<string, ActionDescriptorFilter>
export type ActionDescriptorFilter = (options: ActionDescriptorFilterOptions) => boolean
type ActionDescriptorFilterOptions = {
name: string
value: boolean
event: Event
element: Element
}
export const defaultActionDescriptorFilters: ActionDescriptorFilters = {
stop({ event, value }) {
if (value) event.stopPropagation()
return true
},
prevent({ event, value }) {
if (value) event.preventDefault()
return true
},
self({ event, value, element }) {
if (value) {
return element === event.target
} else {
return true
}
}
}
// capture nos.: 12 23 4 43 1 5 56 7 768 9 98
const descriptorPattern = /^((.+?)(@(window|document))?->)?(.+?)(#([^:]+?))(:(.+))?$/
export function parseActionDescriptorString(descriptorString: string): Partial<ActionDescriptor> {
const source = descriptorString.trim()
const matches = source.match(descriptorPattern) || []
return {
eventTarget: parseEventTarget(matches[4]),
eventName: matches[2],
eventOptions: matches[9] ? parseEventOptions(matches[9]) : {},
identifier: matches[5],
methodName: matches[7]
}
}
function parseEventTarget(eventTargetName: string): EventTarget | undefined {
if (eventTargetName == "window") {
return window
} else if (eventTargetName == "document") {
return document
}
}
function parseEventOptions(eventOptions: string): AddEventListenerOptions {
return eventOptions.split(":").reduce((options, token) =>
Object.assign(options, { [token.replace(/^!/, "")]: !/^!/.test(token) })
, {})
}
export function stringifyEventTarget(eventTarget: EventTarget) {
if (eventTarget == window) {
return "window"
} else if (eventTarget == document) {
return "document"
}
}