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interface NodeInstancePatchingData {
/**
* The patching data shared among the nodes generated by the same template
*/
sharedPatchingData: NodeSharedPatchingData;
/**
* The values previously used to generate the node from the template
*/
values: any[];
}
interface NodeInstancePatchingDataHolder {
__instancePatchingData__: NodeInstancePatchingData;
}
export const attributeMarkerPrefix = "_$attr:";
export const eventMarkerPrefix = "_$evt:";
/**
* The shared patching data of the nodes generated by the same template
*/
export default class NodeSharedPatchingData {
/**
* The patcher to patch the node
*/
private _patcher: NodePatcher;
/**
* The template to clone and generate the node from
*/
private _template: HTMLTemplateElement;
constructor(strings: TemplateStringsArray) {
this._template = createTemplate(strings);
const rules: NodePatcherRule[] = createNodePatcherRules(this._template.content);
this._patcher = new NodePatcher(rules);
}
createNode(oldValues: any[], newValues: any[]): Node {
// The content of the template is a document fragment
let node = this._template.content.cloneNode(/*deep*/true);
const newValuesHolder = {
newValues
}
this._patcher.patch(node, oldValues, newValuesHolder);
(node as unknown as NodeInstancePatchingDataHolder).__instancePatchingData__ = {
sharedPatchingData: this,
values: newValuesHolder.newValues // Store the old values to compare
};
return node;
}
// patchNode(node: Node, oldValues, newValues): void {
// this._patcher.patch(node, oldValues, newValues);
// }
}
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(`${s}<!--${commentMarker}-->`);
}
}
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('');
}
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 === commentMarker) {
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;
}
const regexSelfClosingTag = /\/>/;
function noSelfClosingTagAfter(strings: TemplateStringsArray, i: number) : boolean {
for (; i < strings.length; ++i) {
if (regexSelfClosingTag.test(strings[i])) {
return true;
}
}
return false;
}
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