attrpath
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Attribute Path Traverser.
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<span class="cline-any cline-neutral"> </span></td><td class="text"><pre class="prettyprint lang-js">/**
* Copyright © 2020 2021 2022 7thCode.(http://seventh-code.com/)
* This software is released under the MIT License.
* opensource.org/licenses/mit-license.php
*/
"use strict";
import {AttributeParser, FormulaParser} from './parser';
import {ParserStream} from './stream';
import {BaseHandler, Updater, ValueHandler} from './handler';
export {AttributeParser, <span class="fstat-no" title="function not covered" >FormulaParser,</span> ParserStream, <span class="fstat-no" title="function not covered" >BaseHandler,</span> ValueHandler};
/**
* AttrPath
*/
export class AttrPath {
/**
* traverse
*
* @remarks
* Traverse an object's attributes to get its value.
*
* @param target - Object
* @param path - ObjectPath e.g. ".x.Y.z[1]"
* @param default_value - The value to return if there is no corresponding value in the object path. default is "undefined"
* @returns The value at the position of the path.
*
*/
static traverse(target: any, path: string, default_value: any = undefined): any {
let result = default_value;
if (target) {
const handler: ValueHandler = new ValueHandler(target);
if (new AttributeParser(handler, new ParserStream(path)).parse_path()) {
if (handler.value) {
result = handler.value;
}
}
if (default_value && typeof default_value === 'function') {
default_value(result);
return null;
}
}
return result;
}
static update(target: any, path: string, value: any): boolean {
let result: boolean = false;
if (target) {
const updater: Updater = new Updater(target, value);
if (new AttributeParser(updater, new ParserStream(path)).parse_path()) {
result = (updater.value);
}
}
return result;
}
/**
* is_valid
*
* @remarks
* Is the path grammatically correct?
*
* @param path - ObjectPath e.g. ".x.Y.z[1]"
* @returns true/false
*
*/
static is_valid(path: string): boolean {
return new AttributeParser(null, new ParserStream(path)).parse_path();
}
}
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at Thu Apr 27 2023 16:32:26 GMT+0900 (日本標準時)
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