2020-03-08 22:24:35 +00:00
|
|
|
/*
|
|
|
|
* Copyright (C) 2016-2020 Alex Yatskov <alex@foosoft.net>
|
|
|
|
* Author: Alex Yatskov <alex@foosoft.net>
|
|
|
|
*
|
|
|
|
* This program is free software: you can redistribute it and/or modify
|
|
|
|
* it under the terms of the GNU General Public License as published by
|
|
|
|
* the Free Software Foundation, either version 3 of the License, or
|
|
|
|
* (at your option) any later version.
|
|
|
|
*
|
|
|
|
* This program is distributed in the hope that it will be useful,
|
|
|
|
* but WITHOUT ANY WARRANTY; without even the implied warranty of
|
|
|
|
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
|
|
|
|
* GNU General Public License for more details.
|
|
|
|
*
|
|
|
|
* You should have received a copy of the GNU General Public License
|
|
|
|
* along with this program. If not, see <https://www.gnu.org/licenses/>.
|
|
|
|
*/
|
|
|
|
|
|
|
|
/**
|
|
|
|
* Class used to get and set generic properties of an object by using path strings.
|
|
|
|
*/
|
|
|
|
class ObjectPropertyAccessor {
|
|
|
|
constructor(target, setter=null) {
|
|
|
|
this._target = target;
|
|
|
|
this._setter = (typeof setter === 'function' ? setter : null);
|
|
|
|
}
|
|
|
|
|
|
|
|
getProperty(pathArray, pathLength) {
|
|
|
|
let target = this._target;
|
|
|
|
const ii = typeof pathLength === 'number' ? Math.min(pathArray.length, pathLength) : pathArray.length;
|
|
|
|
for (let i = 0; i < ii; ++i) {
|
|
|
|
const key = pathArray[i];
|
|
|
|
if (!ObjectPropertyAccessor.hasProperty(target, key)) {
|
2020-03-13 22:17:29 +00:00
|
|
|
throw new Error(`Invalid path: ${ObjectPropertyAccessor.getPathString(pathArray.slice(0, i + 1))}`);
|
2020-03-08 22:24:35 +00:00
|
|
|
}
|
|
|
|
target = target[key];
|
|
|
|
}
|
|
|
|
return target;
|
|
|
|
}
|
|
|
|
|
|
|
|
setProperty(pathArray, value) {
|
|
|
|
if (pathArray.length === 0) {
|
|
|
|
throw new Error('Invalid path');
|
|
|
|
}
|
|
|
|
|
|
|
|
const target = this.getProperty(pathArray, pathArray.length - 1);
|
|
|
|
const key = pathArray[pathArray.length - 1];
|
|
|
|
if (!ObjectPropertyAccessor.isValidPropertyType(target, key)) {
|
2020-03-13 22:17:29 +00:00
|
|
|
throw new Error(`Invalid path: ${ObjectPropertyAccessor.getPathString(pathArray)}`);
|
2020-03-08 22:24:35 +00:00
|
|
|
}
|
|
|
|
|
|
|
|
if (this._setter !== null) {
|
|
|
|
this._setter(target, key, value, pathArray);
|
|
|
|
} else {
|
|
|
|
target[key] = value;
|
|
|
|
}
|
|
|
|
}
|
|
|
|
|
|
|
|
static getPathString(pathArray) {
|
|
|
|
const regexShort = /^[a-zA-Z_][a-zA-Z0-9_]*$/;
|
|
|
|
let pathString = '';
|
|
|
|
let first = true;
|
|
|
|
for (let part of pathArray) {
|
|
|
|
switch (typeof part) {
|
|
|
|
case 'number':
|
|
|
|
if (Math.floor(part) !== part || part < 0) {
|
|
|
|
throw new Error('Invalid index');
|
|
|
|
}
|
|
|
|
part = `[${part}]`;
|
|
|
|
break;
|
|
|
|
case 'string':
|
|
|
|
if (!regexShort.test(part)) {
|
|
|
|
const escapedPart = part.replace(/["\\]/g, '\\$&');
|
|
|
|
part = `["${escapedPart}"]`;
|
|
|
|
} else {
|
|
|
|
if (!first) {
|
|
|
|
part = `.${part}`;
|
|
|
|
}
|
|
|
|
}
|
|
|
|
break;
|
|
|
|
default:
|
|
|
|
throw new Error(`Invalid type: ${typeof part}`);
|
|
|
|
}
|
|
|
|
pathString += part;
|
|
|
|
first = false;
|
|
|
|
}
|
|
|
|
return pathString;
|
|
|
|
}
|
|
|
|
|
|
|
|
static getPathArray(pathString) {
|
|
|
|
const pathArray = [];
|
2020-03-15 16:26:38 +00:00
|
|
|
let state = 'empty';
|
2020-03-08 22:24:35 +00:00
|
|
|
let quote = 0;
|
|
|
|
let value = '';
|
|
|
|
let escaped = false;
|
|
|
|
for (const c of pathString) {
|
|
|
|
const v = c.codePointAt(0);
|
|
|
|
switch (state) {
|
2020-03-15 16:26:38 +00:00
|
|
|
case 'empty': // Empty
|
|
|
|
case 'id-start': // Expecting identifier start
|
2020-03-08 22:24:35 +00:00
|
|
|
if (v === 0x5b) { // '['
|
2020-03-15 16:26:38 +00:00
|
|
|
if (state === 'id-start') {
|
2020-03-08 22:24:35 +00:00
|
|
|
throw new Error(`Unexpected character: ${c}`);
|
|
|
|
}
|
2020-03-15 16:26:38 +00:00
|
|
|
state = 'open-bracket';
|
2020-03-08 22:24:35 +00:00
|
|
|
} else if (
|
|
|
|
(v >= 0x41 && v <= 0x5a) || // ['A', 'Z']
|
|
|
|
(v >= 0x61 && v <= 0x7a) || // ['a', 'z']
|
|
|
|
v === 0x5f // '_'
|
|
|
|
) {
|
2020-03-15 16:26:38 +00:00
|
|
|
state = 'id';
|
2020-03-08 22:24:35 +00:00
|
|
|
value += c;
|
|
|
|
} else {
|
|
|
|
throw new Error(`Unexpected character: ${c}`);
|
|
|
|
}
|
|
|
|
break;
|
2020-03-15 16:26:38 +00:00
|
|
|
case 'id': // Identifier
|
2020-03-08 22:24:35 +00:00
|
|
|
if (
|
|
|
|
(v >= 0x41 && v <= 0x5a) || // ['A', 'Z']
|
|
|
|
(v >= 0x61 && v <= 0x7a) || // ['a', 'z']
|
|
|
|
(v >= 0x30 && v <= 0x39) || // ['0', '9']
|
|
|
|
v === 0x5f // '_'
|
|
|
|
) {
|
|
|
|
value += c;
|
|
|
|
} else if (v === 0x5b) { // '['
|
|
|
|
pathArray.push(value);
|
|
|
|
value = '';
|
2020-03-15 16:26:38 +00:00
|
|
|
state = 'open-bracket';
|
2020-03-08 22:24:35 +00:00
|
|
|
} else if (v === 0x2e) { // '.'
|
|
|
|
pathArray.push(value);
|
|
|
|
value = '';
|
2020-03-15 16:26:38 +00:00
|
|
|
state = 'id-start';
|
2020-03-08 22:24:35 +00:00
|
|
|
} else {
|
|
|
|
throw new Error(`Unexpected character: ${c}`);
|
|
|
|
}
|
|
|
|
break;
|
2020-03-15 16:26:38 +00:00
|
|
|
case 'open-bracket': // Open bracket
|
2020-03-08 22:24:35 +00:00
|
|
|
if (v === 0x22 || v === 0x27) { // '"' or '\''
|
|
|
|
quote = v;
|
2020-03-15 16:26:38 +00:00
|
|
|
state = 'string';
|
2020-03-08 22:24:35 +00:00
|
|
|
} else if (v >= 0x30 && v <= 0x39) { // ['0', '9']
|
2020-03-15 16:26:38 +00:00
|
|
|
state = 'number';
|
2020-03-08 22:24:35 +00:00
|
|
|
value += c;
|
|
|
|
} else {
|
|
|
|
throw new Error(`Unexpected character: ${c}`);
|
|
|
|
}
|
|
|
|
break;
|
2020-03-15 16:26:38 +00:00
|
|
|
case 'string': // Quoted string
|
2020-03-08 22:24:35 +00:00
|
|
|
if (escaped) {
|
|
|
|
value += c;
|
|
|
|
escaped = false;
|
|
|
|
} else if (v === 0x5c) { // '\\'
|
|
|
|
escaped = true;
|
|
|
|
} else if (v !== quote) {
|
|
|
|
value += c;
|
|
|
|
} else {
|
2020-03-15 16:26:38 +00:00
|
|
|
state = 'close-bracket';
|
2020-03-08 22:24:35 +00:00
|
|
|
}
|
|
|
|
break;
|
2020-03-15 16:26:38 +00:00
|
|
|
case 'number': // Number
|
2020-03-08 22:24:35 +00:00
|
|
|
if (v >= 0x30 && v <= 0x39) { // ['0', '9']
|
|
|
|
value += c;
|
|
|
|
} else if (v === 0x5d) { // ']'
|
|
|
|
pathArray.push(Number.parseInt(value, 10));
|
|
|
|
value = '';
|
2020-03-15 16:26:38 +00:00
|
|
|
state = 'next';
|
2020-03-08 22:24:35 +00:00
|
|
|
} else {
|
|
|
|
throw new Error(`Unexpected character: ${c}`);
|
|
|
|
}
|
|
|
|
break;
|
2020-03-15 16:26:38 +00:00
|
|
|
case 'close-bracket': // Expecting closing bracket after quoted string
|
2020-03-08 22:24:35 +00:00
|
|
|
if (v === 0x5d) { // ']'
|
|
|
|
pathArray.push(value);
|
|
|
|
value = '';
|
2020-03-15 16:26:38 +00:00
|
|
|
state = 'next';
|
2020-03-08 22:24:35 +00:00
|
|
|
} else {
|
|
|
|
throw new Error(`Unexpected character: ${c}`);
|
|
|
|
}
|
|
|
|
break;
|
2020-03-15 16:26:38 +00:00
|
|
|
case 'next': // Expecting . or [
|
2020-03-08 22:24:35 +00:00
|
|
|
if (v === 0x5b) { // '['
|
2020-03-15 16:26:38 +00:00
|
|
|
state = 'open-bracket';
|
2020-03-08 22:24:35 +00:00
|
|
|
} else if (v === 0x2e) { // '.'
|
2020-03-15 16:26:38 +00:00
|
|
|
state = 'id-start';
|
2020-03-08 22:24:35 +00:00
|
|
|
} else {
|
|
|
|
throw new Error(`Unexpected character: ${c}`);
|
|
|
|
}
|
|
|
|
break;
|
|
|
|
}
|
|
|
|
}
|
|
|
|
switch (state) {
|
2020-03-15 16:26:38 +00:00
|
|
|
case 'empty':
|
|
|
|
case 'next':
|
2020-03-08 22:24:35 +00:00
|
|
|
break;
|
2020-03-15 16:26:38 +00:00
|
|
|
case 'id':
|
2020-03-08 22:24:35 +00:00
|
|
|
pathArray.push(value);
|
|
|
|
value = '';
|
|
|
|
break;
|
|
|
|
default:
|
|
|
|
throw new Error('Path not terminated correctly');
|
|
|
|
}
|
|
|
|
return pathArray;
|
|
|
|
}
|
|
|
|
|
|
|
|
static hasProperty(object, property) {
|
|
|
|
switch (typeof property) {
|
|
|
|
case 'string':
|
|
|
|
return (
|
|
|
|
typeof object === 'object' &&
|
|
|
|
object !== null &&
|
|
|
|
!Array.isArray(object) &&
|
|
|
|
Object.prototype.hasOwnProperty.call(object, property)
|
|
|
|
);
|
|
|
|
case 'number':
|
|
|
|
return (
|
|
|
|
Array.isArray(object) &&
|
|
|
|
property >= 0 &&
|
|
|
|
property < object.length &&
|
|
|
|
property === Math.floor(property)
|
|
|
|
);
|
|
|
|
default:
|
|
|
|
return false;
|
|
|
|
}
|
|
|
|
}
|
|
|
|
|
|
|
|
static isValidPropertyType(object, property) {
|
|
|
|
switch (typeof property) {
|
|
|
|
case 'string':
|
|
|
|
return (
|
|
|
|
typeof object === 'object' &&
|
|
|
|
object !== null &&
|
|
|
|
!Array.isArray(object)
|
|
|
|
);
|
|
|
|
case 'number':
|
|
|
|
return (
|
|
|
|
Array.isArray(object) &&
|
|
|
|
property >= 0 &&
|
|
|
|
property === Math.floor(property)
|
|
|
|
);
|
|
|
|
default:
|
|
|
|
return false;
|
|
|
|
}
|
|
|
|
}
|
|
|
|
}
|