forked from hotwired/stimulus
/
action.ts
112 lines (96 loc) · 3.33 KB
/
action.ts
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import { ActionDescriptor, parseActionDescriptorString, stringifyEventTarget } from "./action_descriptor"
import { Token } from "../mutation-observers"
import { camelize } from "./string_helpers"
const keyMappings: { [key: string]: string } = {
"enter": "Enter",
"tab": "Tab",
"esc": "Escape",
"space": " ",
"up": "ArrowUp",
"down": "ArrowDown",
"left": "ArrowLeft",
"right": "ArrowRight",
"home": "Home",
"end": "End"
}
export class Action {
readonly element: Element
readonly index: number
readonly eventTarget: EventTarget
readonly eventName: string
readonly eventOptions: AddEventListenerOptions
readonly identifier: string
readonly methodName: string
readonly keyFilter: string
static forToken(token: Token) {
return new this(token.element, token.index, parseActionDescriptorString(token.content))
}
constructor(element: Element, index: number, descriptor: Partial<ActionDescriptor>) {
this.element = element
this.index = index
this.eventTarget = descriptor.eventTarget || element
this.eventName = descriptor.eventName || getDefaultEventNameForElement(element) || error("missing event name")
this.eventOptions = descriptor.eventOptions || {}
this.identifier = descriptor.identifier || error("missing identifier")
this.methodName = descriptor.methodName || error("missing method name")
this.keyFilter = descriptor.keyFilter || ''
}
toString() {
const eventFilter = this.keyFilter ? `.${this.keyFilter}` : ""
const eventTarget = this.eventTargetName ? `@${this.eventTargetName}` : ""
return `${this.eventName}${eventFilter}${eventTarget}->${this.identifier}#${this.methodName}`
}
isFilterTarget(key: string): boolean {
if (!(this.keyFilter && keyMappings[this.keyFilter])) {
return false;
}
return keyMappings[this.keyFilter] !== key
}
get params(): object {
if (this.eventTarget instanceof Element) {
return this.getParamsFromEventTargetAttributes(this.eventTarget)
} else {
return {}
}
}
private getParamsFromEventTargetAttributes(eventTarget: Element): {[key: string]: any} {
const params = {}
const pattern = new RegExp(`^data-${this.identifier}-(.+)-param$`)
const attributes = Array.from(eventTarget.attributes)
attributes.forEach(({ name, value }: { name: string, value: string }) => {
const match = name.match(pattern)
const key = match && match[1]
if (key) {
Object.assign(params, { [camelize(key)]: typecast(value) })
}
})
return params
}
private get eventTargetName() {
return stringifyEventTarget(this.eventTarget)
}
}
const defaultEventNames: { [tagName: string]: (element: Element) => string } = {
"a": e => "click",
"button": e => "click",
"form": e => "submit",
"input": e => e.getAttribute("type") == "submit" ? "click" : "input",
"select": e => "change",
"textarea": e => "input"
}
export function getDefaultEventNameForElement(element: Element): string | undefined {
const tagName = element.tagName.toLowerCase()
if (tagName in defaultEventNames) {
return defaultEventNames[tagName](element)
}
}
function error(message: string): never {
throw new Error(message)
}
function typecast(value: any): any {
try {
return JSON.parse(value)
} catch (o_O) {
return value
}
}