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PATCH_NODE = 1, // Patches either a single node or a collection of nodes
PATCH_ATTRIBUTE,
PATCH_EVENT
}
/**
* The rule to "compile" to patch the DOM node
*/
interface NodePatcherRule {
/**
* The type of patching to do to that node
*/
type: NodePatcherRuleTypes,
/**
* The path to locate the node
*/
path: number[],
/**
* The name of the attribute to patch
* Only populated if it is an attribute or an event
*/
name?: string,
}
interface CompiledNodePatcherRule {
/**
* The type of patching to do to that node
*/
type: NodePatcherRuleTypes,
/**
* The node the rule is acting upon
*/
node: Node,
/**
* The name of the attribute to patch
* Only populated if it is an attribute or an event
*/
name?: string,
}
/**
* The patching data that gets attached to a node
*/
interface NodePatchingData {
patcher: NodePatcher,
rules: CompiledNodePatcherRule[],
values: any[]
}
interface NodePatchingDataHolder {
_$patchingData: NodePatchingData
}
const nodeMarker = "_$node_";
const attributeMarkerPrefix = "_$attr:";
const eventMarkerPrefix = "_$evt:";
export class NodePatcher {
/**
* The template to clone and generate the node from
*/
private _template: HTMLTemplateElement;
/**
* The rules to be cloned (compiled)to execute the patching
*/
private _rules: NodePatcherRule[];
constructor(strings: TemplateStringsArray) {
this._template = createTemplate(strings);
this._rules = createNodePatcherRules(this._template.content);
}
createNode(oldValues: any[], newValues: any[]): Node {
// The content of the template is a document fragment
const node = this._template.content.cloneNode(/*deep*/true);
const rules = compileRules(node, this._rules);
const newValuesHolder = {
newValues
};
this.patchNode(node, rules, oldValues, newValuesHolder);
(node as unknown as NodePatchingDataHolder)._$patchingData = {
patcher: this,
rules,
values: newValuesHolder.newValues // Store the old values to compare
};
return node;
}
patchNode(parentNode: Node, rules: CompiledNodePatcherRule[], oldValues: any[], newValuesHolder: { newValues: any[]; }) {
const {
length
} = rules;
for (let i = 0; i < length; ++i) { // The index of the values of the rules match 1 to 1 with the number of rules
const oldValue = oldValues[i];
const newValue = newValuesHolder.newValues[i];
if (oldValue === newValue) {
continue;
}
const rule = rules[i];
const {
type,
name,
node
} = rule;
switch (type) {
case NodePatcherRuleTypes.PATCH_NODE:
{
Eif (type === NodePatcherRuleTypes.PATCH_NODE) {
throw new Error('patchNode not implemented');
}
// if (childNode === undefined) { // The node does not have any child at that path
// childNode = node as HTMLElement;
// }
// const parentNode = (childNode.parentNode !== null ?
// childNode.parentNode :
// childNode) as HTMLElement;
// let { childNodes } = parentNode;
// if (Array.isArray(newValue)) { // Collection of nodes
// if (
// childNode.nodeType === Node.COMMENT_NODE &&
// (childNode as Comment).data === nodeMarker
// ) {
// parentNode.replaceChildren(...newValue); // Replace the marker with the children
// // If the newValue is an array of document fragments, they will lose their children after replacement
// // Ensure the children have the instance of the patching data
// childNodes = parentNode.childNodes;
// const length = childNodes.length;
// for (let i = 0; i < length; ++i) {
// const instancePatchingData = newValue[i].__instancePatchingData__;
// if (instancePatchingData !== undefined) {
// (childNodes[i] as any).__instancePatchingData__ = instancePatchingData;
// }
// }
// // Restore the values
// newValuesHolder.newValues = [Array.from(childNodes)];
// }
// else { // Parent node has children
// patchChildren(parentNode, newValue); // Patch the existing children
// }
// }
// else { // Single value or node
// if (newValue instanceof DocumentFragment) {
// parentNode.replaceChild(newValue, childNode);
// }
// else {
// parentNode.replaceChild(document.createTextNode(newValue), childNode);
// }
// }
}
break;
case NodePatcherRuleTypes.PATCH_ATTRIBUTE:
{
patchAttribute(node as HTMLElement, name, oldValue, newValue);
}
break;
case NodePatcherRuleTypes.PATCH_EVENT:
{
const eventName: string = name.slice(2).toLowerCase();
const nameParts = eventName.split('_'); // Just in case it has the capture parameter in the event
const useCapture: boolean = nameParts[1]?.toLowerCase() === 'capture'; // The convention is: eventName_capture for capture. Example onClick_capture
Eif (oldValue === undefined &&
newValue !== undefined) {
node.addEventListener(eventName, newValue, useCapture);
}
else {
node.removeEventListener(eventName, newValue, useCapture);
}
// Remove the attribute from the HTML
(node as HTMLElement).removeAttribute(name);
}
break;
default: throw Error(`patch is not implemented for rule type: ${type}`);
}
}
}
}
function createTemplate(strings: TemplateStringsArray): HTMLTemplateElement {
const t = document.createElement('template');
t.innerHTML = createTemplateString(strings);
return t;
}
export function createTemplateString(strings: TemplateStringsArray): string {
const parts: string[] = [];
const length = strings.length - 1; // Exclude the last one
for (let i = 0; i < length; ++i) {
const s = strings[i];
if (s.endsWith('=')) { // It is an attribute
const name = getAttributeName(s);
if (name[0] === 'o' && name[1] === 'n') { // It is an event handler
parts.push(`${s}"${eventMarkerPrefix}${name}"`);
}
else {
parts.push(`${s}"${attributeMarkerPrefix}${name}"`);
}
}
else if (!noSelfClosingTagAfter(strings, i)) {
parts.push(`${s}<!--${nodeMarker}-->`);
}
}
parts.push(strings[length]); // Add the ending string
return parts.join('');
}
function getAttributeName(s: string): string {
let b: string[] = [];
for (let i = s.lastIndexOf('=') - 1; i >= 0; --i) {
if (s[i] === ' ') { // Finished with the name of the attribute
break;
}
b = [s[i], ...b]; // Prepend
}
return b.join('');
}
const regexSelfClosingTag = /\/>/;
function noSelfClosingTagAfter(strings: TemplateStringsArray, i: number) : boolean {
for (; i < strings.length; ++i) {
if (regexSelfClosingTag.test(strings[i])) {
return true;
}
}
return false;
}
function createNodePatcherRules(node: Node, path: number[] = [], rules: NodePatcherRule[] = []): NodePatcherRule[] {
const {
childNodes
} = node;
const {
length
} = childNodes;
if (node.nodeType === Node.COMMENT_NODE &&
(node as Text).data === nodeMarker) {
rules.push({
type: NodePatcherRuleTypes.PATCH_NODE,
path: [...path]
});
return rules; // Comments do not have attributes and children so we are done
}
else if (node.nodeType === Node.TEXT_NODE) {
return rules; // No need to create rules for a text literal
}
else {
const attributes = (node as HTMLElement).attributes;
if (attributes !== undefined) {
rules = createAttributePatcherRules(attributes, path, rules);
}
}
for (let i = 0; i < length; ++i) {
rules = createNodePatcherRules(childNodes[i], [...path, i], rules);
}
return rules;
}
function createAttributePatcherRules(attributes: NamedNodeMap, path: number[], rules: NodePatcherRule[]): NodePatcherRule[] {
const {
length
} = attributes;
for (let i = 0; i < length; ++i) {
const value = attributes[i].value;
if (value.startsWith(attributeMarkerPrefix)) {
const name = value.split(':')[1];
rules.push({
type: NodePatcherRuleTypes.PATCH_ATTRIBUTE,
path,
name
});
}
else if (value.startsWith(eventMarkerPrefix)) {
const name = value.split(':')[1];
rules.push({
type: NodePatcherRuleTypes.PATCH_EVENT,
path,
name
});
}
}
return rules;
}
function compileRules(node: Node, rules: NodePatcherRule[]) : CompiledNodePatcherRule[] {
const compiledRules: CompiledNodePatcherRule[] = [];
const length = rules.length;
for (let i = 0; i < length; i++) {
const {
type,
path,
name
} = rules[i];
compiledRules.push( {
type,
name,
node: findNode(node, path)
});
}
return compiledRules;
}
function findNode(node: Node, path: number[]): HTMLElement | Comment | Text {
let p = path;
for (let i = 0; i < p.length; ++i) {
const index = p[i];
node = node.childNodes[index];
}
return node as HTMLElement | Comment | Text;
}
function patchAttribute(node: HTMLElement, name: string, oldValue: string, newValue: string): boolean {
Iif (newValue === undefined) { // It was removed in the new virtual node
node.removeAttribute(name);
return true;
}
else {
Iif (newValue === oldValue) {
return false;
}
else {
setAttribute(node, name, newValue);
return true;
}
}
}
function setAttribute(node: HTMLElement, key: string, value: string) {
if (value === 'undefined' ||
value === 'null' ||
value === '' ||
value === 'false') {
node.removeAttribute(key);
}
else {
Iif (value === 'true') {
node.setAttribute(key, '');
}
else {
const type = typeof value;
if (type === 'object') {
value = JSON.stringify(value);
}
node.setAttribute(key, value);
}
}
}
export default function patch(node: Node, newNode: Node) {
const {
patcher: oldPatcher,
rules: oldRules,
values: oldValues
} = (node as any)._$patchingData;
const {
patcher: newPatcher,
values: newValues
} = (newNode as any)._$patchingData;
if (oldPatcher === newPatcher) {
oldPatcher.patchNode(node, oldRules, oldValues, { newValues });
}
else {
throw new Error('Not implemented');
}
} |