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import { reactive } from '../reactivity'
import { setClasses } from './classes'
import { setStyles } from './styles'
export default function bind(el, name, value, modifiers = []) {
// Register bound data as pure observable data for other APIs to use.
if (! el._x_bindings) el._x_bindings = reactive({})
el._x_bindings[name] = value
name = modifiers.includes('camel') ? camelCase(name) : name
switch (name) {
case 'value':
bindInputValue(el, value)
break;
case 'style':
bindStyles(el, value)
break;
case 'class':
bindClasses(el, value)
break;
default:
bindAttribute(el, name, value)
break;
}
}
function bindInputValue(el, value) {
if (el.type === 'radio') {
// Set radio value from x-bind:value, if no "value" attribute exists.
// If there are any initial state values, radio will have a correct
// "checked" value since x-bind:value is processed before x-model.
if (el.attributes.value === undefined) {
el.value = value
}
// @todo: yuck
if (window.fromModel) {
el.checked = checkedAttrLooseCompare(el.value, value)
}
} else if (el.type === 'checkbox') {
// If we are explicitly binding a string to the :value, set the string,
// If the value is a boolean/array/number/null/undefined, leave it alone, it will be set to "on"
// automatically.
if (Number.isInteger(value)) {
el.value = value
} else if (! Number.isInteger(value) && ! Array.isArray(value) && typeof value !== 'boolean' && ! [null, undefined].includes(value)) {
el.value = String(value)
} else {
if (Array.isArray(value)) {
el.checked = value.some(val => checkedAttrLooseCompare(val, el.value))
} else {
el.checked = !!value
}
}
} else if (el.tagName === 'SELECT') {
updateSelect(el, value)
} else {
if (el.value === value) return
el.value = value
}
}
function bindClasses(el, value) {
if (el._x_undoAddedClasses) el._x_undoAddedClasses()
el._x_undoAddedClasses = setClasses(el, value)
}
function bindStyles(el, value) {
if (el._x_undoAddedStyles) el._x_undoAddedStyles()
el._x_undoAddedStyles = setStyles(el, value)
}
function bindAttribute(el, name, value) {
if ([null, undefined, false].includes(value) && attributeShouldntBePreservedIfFalsy(name)) {
el.removeAttribute(name)
} else {
if (isBooleanAttr(name)) value = name
setIfChanged(el, name, value)
}
}
function setIfChanged(el, attrName, value) {
if (el.getAttribute(attrName) != value) {
el.setAttribute(attrName, value)
}
}
function updateSelect(el, value) {
const arrayWrappedValue = [].concat(value).map(value => { return value + '' })
Array.from(el.options).forEach(option => {
option.selected = arrayWrappedValue.includes(option.value)
})
}
function camelCase(subject) {
return subject.toLowerCase().replace(/-(\w)/g, (match, char) => char.toUpperCase())
}
function checkedAttrLooseCompare(valueA, valueB) {
return valueA == valueB
}
function isBooleanAttr(attrName) {
// As per HTML spec table https://html.spec.whatwg.org/multipage/indices.html#attributes-3:boolean-attribute
// Array roughly ordered by estimated usage
const booleanAttributes = [
'disabled','checked','required','readonly','hidden','open', 'selected',
'autofocus', 'itemscope', 'multiple', 'novalidate','allowfullscreen',
'allowpaymentrequest', 'formnovalidate', 'autoplay', 'controls', 'loop',
'muted', 'playsinline', 'default', 'ismap', 'reversed', 'async', 'defer',
'nomodule'
]
return booleanAttributes.includes(attrName)
}
function attributeShouldntBePreservedIfFalsy(name) {
return ! ['aria-pressed', 'aria-checked', 'aria-expanded', 'aria-selected'].includes(name)
}
export function getBinding(el, name, fallback) {
// First let's get it out of Alpine bound data.
if (el._x_bindings && el._x_bindings[name] !== undefined) return el._x_bindings[name]
// If not, we'll return the literal attribute.
let attr = el.getAttribute(name)
// Nothing bound:
if (attr === null) return typeof fallback === 'function' ? fallback() : fallback
if (isBooleanAttr(name)) {
return !! [name, 'true'].includes(attr)
}
// The case of a custom attribute with no value. Ex: <div manual>
if (attr === '') return true
return attr
}
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