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* @license MIT
* @author IFYates <https://github.com/ifyates/pow.js>
* @description A very small and lightweight templating framework.
* @version 3.7.3
*/
const ATTR_POW = 'pow', P_DATA = '$data', P_PARENT = '$parent', P_PATH = '$path', P_ROOT = '$root'
const B_ARRAY = 'array', B_DATA = 'data', B_ELSE = 'else', B_IF = 'if', B_IFNOT = 'ifnot', B_TEMPLATE = 'template', B_TRANSFORM = 'transform'
const MOUSTACHE_RE = /{{\s*(.*?)\s*}}/gs
const $attr = { set: (el, name, value) => el.setAttribute(name, value), rem: (el, name) => el.removeAttribute(name) }
const $cloneNode = (el) => el.cloneNode(1)
const $cloneState = (state) => ({ ...state[P_DATA], ...state, [P_PARENT]: state[P_PARENT] && $cloneState(state[P_PARENT]) })
const $escape = (text, skip) => skip || !text.replace ? text : text.replace(/({|p)({|ow)/g, '$1$2')
const $fragment = (html) => document.createRange().createContextualFragment(html)
const $randomId = _ => '_' + Math.random().toString(36).slice(2)
const $replace = (el, html) => el?.isConnected ? el.outerHTML = html : el?.replaceWith($fragment(html)) // Replace items not in document DOM
const $selectChildren = (el, selector) => (el.content ?? el).querySelectorAll(selector), $selectChild = (el, id) => $selectChildren(el, '#' + id)[0]
const bind = (root) => {
const _originalHTML = root.innerHTML, _attributes = [...root.attributes]
const _bindingId = '$pow' + $randomId(), _sections = {}
const processElement = (element, state, isRoot, val) => {
// Resolves an expression to a value
const evalExpr = (expr, context = $cloneState(state)) => {
try {
// Execute the expression as JS code, mapping to the state data
return pow._eval(expr, context)
} catch (e) {
console.warn('Interpolation failed', { [P_PATH]: state[P_PATH], expr }, e)
}
}
// Allow sibling 'else' based on condition
const processCondition = (active, alwaysRemove, sibling = element.nextElementSibling) => {
if (!active && sibling?.attributes.pow)
$attr.rem(sibling, B_ELSE)
return (alwaysRemove | !active) && !$replace(element, '')
}
// Check if a value has resolved to a Promise
const resolvePromise = (value, context) =>
value?.constructor?.name == 'AsyncFunction'
? value(context)
: value instanceof Promise ? value : 0
// Convert a function to a bound string
const bindFunction = (fn, id = $randomId()) => {
window[_bindingId][id] = (target) => fn.call(target, $cloneState(state))
return `${_bindingId}.${id}(this)`
}
// Prepare custom elements
for (const child of [...$selectChildren(element, '*')].filter($ => $.tagName.startsWith('POW:')))
$replace(child, child.outerHTML.replace(/^<pow:([\w-]+)/i, `<${B_TEMPLATE} ${ATTR_POW} ${B_TEMPLATE}="$1"`))
// Disable child HTML for stopped bindings
for (const child of $selectChildren(element, '*[pow][stop]'))
$replace(child, $escape(child.outerHTML))
$attr.rem(element, ATTR_POW)
// Process each attribute in order
let transformFunction = 0
for (const { name, value } of [...element.attributes]) {
if (name == B_ELSE) // If 'else' survives to here, the element isn't wanted
return $replace(element, '')
$attr.rem(element, name)
if (name == B_TEMPLATE && !processCondition(val = $selectChild(document, value))) { // Apply template
// Gather content data
let content = {}, defaultContent = null
for (const child of $selectChildren(element, B_TEMPLATE + ':not([pow])')) {
defaultContent ??= child.innerHTML // Remember first template
content[child.id] = child.innerHTML
}
defaultContent ??= element.innerHTML // No templates, use whole content
// Build content with replaced params
// Has to be a regex on full HTML due to template contents not being in DOM
element.innerHTML = val.innerHTML.replace(/<param(?:\s+id=["']([^"']+)["'])?\s*\/?>/g,
// Find templates by id or default first
// Default param (no id), takes whole content if there were no templates
(_, id) => id ? (content[id] || '') : defaultContent)
return processElement(element, { ...state, $content: content })
} else if (name == B_TRANSFORM) { // Transformation function
transformFunction = evalExpr(value)
// TODO: async support?
continue
} else if (name == 'section' && value) { // Store render section
// TODO: allow unnamed section? `value = (value || $randomId())`
element.id = element.id || $randomId()
state.$section = _sections[value] = (data) => {
copy.state[P_DATA] = data ?? copy.state[P_DATA]
val = $cloneNode(copy.element)
return _exec(val, _ => {
$selectChild(root, element.id).replaceWith(val)
processElement(val, copy.state, 1)
})
}
const copy = { element: $cloneNode(element), state: { ...state } }
continue
}
// Resolve value to expression or text
const isBinding = name == B_ARRAY | name == B_DATA | name == B_IF | name == B_IFNOT
const isInterpolatedAttribute = name[0] == ':', isDataAttribute = name.at(-1) == ':'
const implicitExpr = isBinding | isInterpolatedAttribute | isDataAttribute
MOUSTACHE_RE.lastIndex = 0
if (!value) {
val = implicitExpr ? state[P_DATA] : value
} else if (val = MOUSTACHE_RE.exec(value)) {
// Treat value of a single moustache as an expression
if (val[0].length == value.length) {
val = evalExpr(val[1])
} else {
// Parse all values
val = value.replace(MOUSTACHE_RE, (_, expr) => evalExpr(expr) ?? '')
}
} else {
// Treat value without moustaches as an expression
val = implicitExpr ? evalExpr(value) : value
}
// If Promise, store element until it can be resolved
var promise
if (promise = resolvePromise(val, state)) {
// Remember source include siblings in template + resolve 'else' now
$attr.set(element, ATTR_POW)
var html = element.outerHTML, el = element.nextElementSibling, elseId
while (el?.attributes[ATTR_POW] && el.attributes[B_ELSE]) {
html += el.outerHTML
if (!el.attributes.if && !el.attributes[B_IFNOT]) {
$attr.rem(el, B_ELSE)
el.id = elseId = $randomId()
break
}
var nx = el.nextElementSibling
$replace(el, '')
el = nx
}
// Replace element until Promise resolved
$replace(element, `<${B_TEMPLATE} id="${val = $randomId()}"></${B_TEMPLATE}>`)
return promise.then(r => {
el = $selectChild(root, val)
el.innerHTML = html.replace(' ', ` ${name}="{{ $async }}" `)
processElement(el, { ...state, $async: r }, 1)
if (elseId)
$replace($selectChild(root, elseId), '')
})
}
if (name == B_ARRAY) { // Element loop
val = !val | Array.isArray(val) ? val
: Object.entries(val).map(([key, value]) => ({ key, value }))
for (let i = 0; i < val?.length; ++i) {
const child = $cloneNode(element)
element.parentNode.insertBefore(child, element)
processElement(child, {
...state, [P_PATH]: `${state[P_PATH]}.${value || B_ARRAY}[${i}]`, [P_DATA]: val[i],
[P_PARENT]: state, $index: i, $first: !i, $last: i > val.length - 2, $array: val,
$prev: i ? val[i - 1] : '', $next: i < val.length - 1 ? val[i + 1] : ''
})
}
return processCondition(val?.length, 1)
} else if (name == B_DATA) { // Data binding
return processCondition(val != null)
? 0 // Removed as inactive
: processElement(element, {
...state, [P_PATH]: state[P_PATH] + '.' + value,
[P_DATA]: val, [P_PARENT]: state
}, isRoot)
} else if (isInterpolatedAttribute) { // Interpolated attribute
if (val)
$attr.set(element, name.slice(1), val)
return processElement(element, state, isRoot)
} else if (name == B_IF | name == B_IFNOT) { // Conditional element
if (processCondition((name == B_IF) != !val))
return // Removed as inactive
} else if (isDataAttribute) { // Data attribute
state = { ...state, [P_DATA]: { ...state[P_DATA], [name.slice(0, -1)]: val } }
} else if (val instanceof Function) {
$attr.set(element, name, bindFunction(val))
} else if (val || val === 0) { // Standard attribute
$attr.set(element, name, $escape('' + val, isRoot))
}
}
// Process every child 'pow' template
while (val = $selectChildren(element, '[pow]:not([pow] [pow])')[0])
processElement(val, state)
// Transform complete element
if (transformFunction?.call)
transformFunction.call(element, element, state)
// Parse inner HTML
html = element.innerHTML.replace(MOUSTACHE_RE, (_, expr) => {
const context = $cloneState(state)
const value = evalExpr($fragment(expr).textContent, context)
if (!value)
return value ?? ''
// Display async result when available
if (expr = resolvePromise(value, context)) {
const id = $randomId()
expr.then(r => $replace($selectChild(root, id), r))
return `<${B_TEMPLATE} id="${id}"></${B_TEMPLATE}>`
}
// TODO: drop in v4
// If the result is a function, bind it for later
return value.call ? bindFunction(value) : value
})
element.innerHTML = $escape(html, isRoot)
if (element.localName == B_TEMPLATE)
$replace(element, element.innerHTML)
}
// Safely run logic on an element
const _exec = (target, logic) => {
if (_exec.$)
return console.warn('Binding already in progress')
_exec.$ = 1
try {
logic()
} finally {
target.innerHTML = target.innerHTML.replace(//g, '')
delete _exec.$
}
_binding.sections = { ..._sections }
return _binding
}
const _binding = {
apply: (data) => _exec(root, _ => {
// Reset global state
root.innerHTML = _originalHTML
for (const attr of _attributes)
$attr.set(root, attr.name, attr.value)
window[_bindingId] = {}
processElement(root, { [P_PATH]: P_ROOT, [P_DATA]: data, [P_ROOT]: data }, 1)
_binding.refresh = _ => _binding.apply(data)
}),
refresh: _ => { }
}
return _binding
}
const pow = {
apply: (element, data) => bind(element).apply(data),
bind,
_eval: (expr, ctxt, _args = Object.entries(ctxt).filter($ => isNaN($[0]))) =>
(new Function(..._args.map($ => $[0]), 'return ' + expr)).call(ctxt[P_DATA], ..._args.map($ => $[1]))
}
export default pow |