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import { dontAutoEvaluateFunctions, evaluate } from '../evaluator'
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;
// 'selected' and 'checked' are special attributes that aren't necessarily
// synced with their corresponding properties when updated, so both the
// attribute and property need to be updated when bound.
case 'selected':
case 'checked':
bindAttributeAndProperty(el, name, value)
break;
default:
bindAttribute(el, name, value)
break;
}
}
function bindInputValue(el, value) {
if (isRadio(el)) {
// 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) {
if (typeof value === 'boolean') {
el.checked = safeParseBoolean(el.value) === value
} else {
el.checked = checkedAttrLooseCompare(el.value, value)
}
}
} else if (isCheckbox(el)) {
// 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 (! 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 === undefined ? '' : 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 bindAttributeAndProperty(el, name, value) {
bindAttribute(el, name, value)
setPropertyIfChanged(el, name, 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 setPropertyIfChanged(el, propName, value) {
if (el[propName] !== value) {
el[propName] = 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
}
export function safeParseBoolean(rawValue) {
if ([1, '1', 'true', 'on', 'yes', true].includes(rawValue)) {
return true
}
if ([0, '0', 'false', 'off', 'no', false].includes(rawValue)) {
return false
}
return rawValue ? Boolean(rawValue) : null
}
// As per HTML spec table https://html.spec.whatwg.org/multipage/indices.html#attributes-3:boolean-attribute
const booleanAttributes = new Set([
'allowfullscreen',
'async',
'autofocus',
'autoplay',
'checked',
'controls',
'default',
'defer',
'disabled',
'formnovalidate',
'inert',
'ismap',
'itemscope',
'loop',
'multiple',
'muted',
'nomodule',
'novalidate',
'open',
'playsinline',
'readonly',
'required',
'reversed',
'selected',
'shadowrootclonable',
'shadowrootdelegatesfocus',
'shadowrootserializable',
])
function isBooleanAttr(attrName) {
return booleanAttributes.has(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]
return getAttributeBinding(el, name, fallback)
}
export function extractProp(el, name, fallback, extract = true) {
// 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 (el._x_inlineBindings && el._x_inlineBindings[name] !== undefined) {
let binding = el._x_inlineBindings[name]
binding.extract = extract
return dontAutoEvaluateFunctions(() => {
return evaluate(el, binding.expression)
})
}
return getAttributeBinding(el, name, fallback)
}
function getAttributeBinding(el, name, fallback) {
// If not, we'll return the literal attribute.
let attr = el.getAttribute(name)
// Nothing bound:
if (attr === null) return typeof fallback === 'function' ? fallback() : fallback
// The case of a custom attribute with no value. Ex: <div manual>
if (attr === '') return true
if (isBooleanAttr(name)) {
return !! [name, 'true'].includes(attr)
}
return attr
}
export function isCheckbox(el) {
return el.type === 'checkbox' || el.localName === 'ui-checkbox' || el.localName === 'ui-switch'
}
export function isRadio(el) {
return el.type === 'radio' || el.localName === 'ui-radio'
}