File size: 3,308 Bytes
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const Clone = require('@hapi/hoek/lib/clone');
const Reach = require('@hapi/hoek/lib/reach');
const Common = require('./common');
const internals = {
value: Symbol('value')
};
module.exports = internals.State = class {
constructor(path, ancestors, state) {
this.path = path;
this.ancestors = ancestors; // [parent, ..., root]
this.mainstay = state.mainstay;
this.schemas = state.schemas; // [current, ..., root]
this.debug = null;
}
localize(path, ancestors = null, schema = null) {
const state = new internals.State(path, ancestors, this);
if (schema &&
state.schemas) {
state.schemas = [internals.schemas(schema), ...state.schemas];
}
return state;
}
nest(schema, debug) {
const state = new internals.State(this.path, this.ancestors, this);
state.schemas = state.schemas && [internals.schemas(schema), ...state.schemas];
state.debug = debug;
return state;
}
shadow(value, reason) {
this.mainstay.shadow = this.mainstay.shadow || new internals.Shadow();
this.mainstay.shadow.set(this.path, value, reason);
}
snapshot() {
if (this.mainstay.shadow) {
this._snapshot = Clone(this.mainstay.shadow.node(this.path));
}
this.mainstay.snapshot();
}
restore() {
if (this.mainstay.shadow) {
this.mainstay.shadow.override(this.path, this._snapshot);
this._snapshot = undefined;
}
this.mainstay.restore();
}
};
internals.schemas = function (schema) {
if (Common.isSchema(schema)) {
return { schema };
}
return schema;
};
internals.Shadow = class {
constructor() {
this._values = null;
}
set(path, value, reason) {
if (!path.length) { // No need to store root value
return;
}
if (reason === 'strip' &&
typeof path[path.length - 1] === 'number') { // Cannot store stripped array values (due to shift)
return;
}
this._values = this._values || new Map();
let node = this._values;
for (let i = 0; i < path.length; ++i) {
const segment = path[i];
let next = node.get(segment);
if (!next) {
next = new Map();
node.set(segment, next);
}
node = next;
}
node[internals.value] = value;
}
get(path) {
const node = this.node(path);
if (node) {
return node[internals.value];
}
}
node(path) {
if (!this._values) {
return;
}
return Reach(this._values, path, { iterables: true });
}
override(path, node) {
if (!this._values) {
return;
}
const parents = path.slice(0, -1);
const own = path[path.length - 1];
const parent = Reach(this._values, parents, { iterables: true });
if (node) {
parent.set(own, node);
return;
}
if (parent) {
parent.delete(own);
}
}
};
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