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function _constructValue (parts, node) {
if (parts == null) return null
if (typeof parts === 'function') {
parts = parts(node)
}
if (Array.isArray(parts)) {
const mappedParts = parts.map(part => {
if (typeof part === 'function') {
part = part(node)
}
if (part == null) return ''
if (part && part.type === 'part') {
return part.value
} else {
return part
}
})
if (mappedParts.length === 1) {
return mappedParts[0]
}
return mappedParts.join('')
}
return parts
}
function _renderAttributes (attributes, node) {
let obj = {}
attributes.forEach(attribute => {
if (typeof attribute === 'function') {
attribute = attribute(node)
}
if (attribute == null) return
if (attribute && attribute.type === 'attribute') {
const name = attribute.name
if (Object.prototype.hasOwnProperty.call(obj, name)) return
const value = _constructValue(attribute.value, node)
if (value == null) {
obj[name] = name
} else {
obj[name] = value
}
} else if (Array.isArray(attribute)) {
obj = Object.assign(_renderAttributes(attribute, node), obj)
} else if (typeof attribute === 'object') {
Object.entries(attribute).forEach(([name, value]) => {
if (Object.prototype.hasOwnProperty.call(obj, name)) return
obj[name] = value
})
} else {
const name = attribute.toString()
if (Object.prototype.hasOwnProperty.call(obj, name)) return
obj[name] = name
}
})
return obj
}
function _setAttribute (element, name, value) {
if (element[name] !== value) {
try {
element[name] = value
} catch (e) {
// SVGs don't like getting their properties set and that's okay...
}
}
if (!(typeof value).match(/(?:boolean|number|string)/)) {
value = name
}
const str = value.toString()
if (element.getAttribute(name) !== str) {
element.setAttribute(name, str)
}
return element
}
function _setAttributes (element, attributes) {
Object.entries(attributes).forEach(([name, value]) => {
_setAttribute(element, name, value)
})
return element
}
function _pruneAttributes (element, newAttributes, oldAttributes) {
const orphans = new Set(Object.keys(oldAttributes))
Object.keys(newAttributes).forEach(attribute => orphans.delete(attribute))
orphans.forEach(attribute => {
element.removeAttribute(attribute)
delete element[attribute]
})
}
const _descriptionMap = new Map()
function _descriptionsToNodes (descriptions, xmlns) {
if (!Array.isArray(descriptions)) {
descriptions = [descriptions]
}
const nodes = []
descriptions.forEach(description => {
if (typeof description === 'function') {
description = description()
}
if (description != null) {
if (Array.isArray(description)) {
nodes.push(..._descriptionsToNodes(description, xmlns))
} else {
if (description.tag === null || description.tag === '') {
nodes.push(..._descriptionsToNodes(description.children, xmlns))
} else if (typeof description.tag === 'function') {
const attributes = _renderAttributes(description.attributes)
nodes.push(..._descriptionsToNodes(description.tag(attributes, description.children, description), attributes.xmlns || xmlns))
} else if (description.type) {
if (!_descriptionMap.has(description)) {
let node
if (description.type === 'textnode') {
node = document.createTextNode(description.value)
} else {
let oldAttributes = {}
let newAttributes = _renderAttributes(description.attributes, node)
node = document.createElementNS(newAttributes.xmlns || xmlns, description.tag, { is: description.attributes.is })
_setAttributes(node, newAttributes)
render(node, description.children, newAttributes.xmlns || xmlns)
watchFunction(() => {
newAttributes = _renderAttributes(description.attributes, node)
_setAttributes(node, newAttributes)
_pruneAttributes(node, newAttributes, oldAttributes)
oldAttributes = newAttributes
})
}
_descriptionMap.set(description, node)
}
nodes.push(_descriptionMap.get(description))
} else {
console.log(description)
nodes.push(document.createTextNode(description.toString()))
}
}
}
})
return nodes
}
function _setChildren (element, descriptions, xmlns) {
const newNodes = _descriptionsToNodes(descriptions, xmlns)
newNodes.forEach((newNode, index) => {
while (element.childNodes[index] !== newNode) {
const oldNode = element.childNodes[index]
if (!oldNode) {
element.appendChild(newNode)
} else if (newNodes.indexOf(oldNode) > index) {
element.insertBefore(newNode, oldNode)
} else {
element.removeChild(oldNode)
}
}
})
while (element.childNodes.length > newNodes.length) {
element.removeChild(element.lastChild)
}
return element
}
export function render (element, descriptions, xmlns = 'http://www.w3.org/1999/xhtml') {
if (!descriptions) {
return _descriptionsToNodes(element, xmlns)
}
function f () {
return _setChildren(element, descriptions, xmlns)
}
watchFunction(f)
}
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