forked from Fediversity/fediversity.eu
167 lines
3.4 KiB
JavaScript
Executable file
167 lines
3.4 KiB
JavaScript
Executable file
'use strict';
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const Clone = require('@hapi/hoek/lib/clone');
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const Reach = require('@hapi/hoek/lib/reach');
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const Common = require('./common');
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const internals = {
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value: Symbol('value')
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};
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module.exports = internals.State = class {
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constructor(path, ancestors, state) {
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this.path = path;
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this.ancestors = ancestors; // [parent, ..., root]
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this.mainstay = state.mainstay;
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this.schemas = state.schemas; // [current, ..., root]
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this.debug = null;
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}
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localize(path, ancestors = null, schema = null) {
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const state = new internals.State(path, ancestors, this);
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if (schema &&
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state.schemas) {
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state.schemas = [internals.schemas(schema), ...state.schemas];
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}
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return state;
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}
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nest(schema, debug) {
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const state = new internals.State(this.path, this.ancestors, this);
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state.schemas = state.schemas && [internals.schemas(schema), ...state.schemas];
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state.debug = debug;
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return state;
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}
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shadow(value, reason) {
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this.mainstay.shadow = this.mainstay.shadow || new internals.Shadow();
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this.mainstay.shadow.set(this.path, value, reason);
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}
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snapshot() {
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if (this.mainstay.shadow) {
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this._snapshot = Clone(this.mainstay.shadow.node(this.path));
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}
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this.mainstay.snapshot();
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}
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restore() {
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if (this.mainstay.shadow) {
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this.mainstay.shadow.override(this.path, this._snapshot);
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this._snapshot = undefined;
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}
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this.mainstay.restore();
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}
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commit() {
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if (this.mainstay.shadow) {
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this.mainstay.shadow.override(this.path, this._snapshot);
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this._snapshot = undefined;
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}
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this.mainstay.commit();
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}
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};
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internals.schemas = function (schema) {
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if (Common.isSchema(schema)) {
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return { schema };
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}
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return schema;
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};
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internals.Shadow = class {
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constructor() {
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this._values = null;
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}
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set(path, value, reason) {
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if (!path.length) { // No need to store root value
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return;
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}
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if (reason === 'strip' &&
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typeof path[path.length - 1] === 'number') { // Cannot store stripped array values (due to shift)
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return;
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}
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this._values = this._values || new Map();
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let node = this._values;
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for (let i = 0; i < path.length; ++i) {
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const segment = path[i];
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let next = node.get(segment);
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if (!next) {
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next = new Map();
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node.set(segment, next);
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}
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node = next;
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}
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node[internals.value] = value;
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}
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get(path) {
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const node = this.node(path);
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if (node) {
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return node[internals.value];
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}
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}
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node(path) {
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if (!this._values) {
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return;
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}
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return Reach(this._values, path, { iterables: true });
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}
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override(path, node) {
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if (!this._values) {
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return;
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}
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const parents = path.slice(0, -1);
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const own = path[path.length - 1];
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const parent = Reach(this._values, parents, { iterables: true });
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if (node) {
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parent.set(own, node);
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return;
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}
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if (parent) {
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parent.delete(own);
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}
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}
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};
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