attrpath
Version:
Attribute Path Traverser.
173 lines • 4.13 kB
JavaScript
/**
* Copyright © 2020 2021 2022 7thCode.(http://seventh-code.com/)
* This software is released under the MIT License.
* opensource.org/licenses/mit-license.php
*/
;
Object.defineProperty(exports, "__esModule", { value: true });
exports.Updater = exports.ValueHandler = exports.BaseHandler = void 0;
const base_1 = require("./base");
const parser_1 = require("./parser");
/**
* BaseHandler
*
* @remarks
*
*/
class BaseHandler {
}
exports.BaseHandler = BaseHandler;
/**
* ValueHandler
*
* actually traverse the object.
*
* @remarks
*
*/
class ValueHandler extends BaseHandler {
/**
*
* @remarks
*/
constructor(root_value) {
super();
this.current_value = null;
this.current_value = root_value;
}
/**
* value
*
* Data
*/
get value() {
return this.current_value;
}
/**
* Symbol Handler
*
* @remarks
* Executed when Parser recognizes Token.
*
* @param type - Symbol Type
* @param word
* @param term
* @returns void
*
*/
token(type, word, term) {
switch (type) {
case parser_1.TokenType.operator:
// console.log("operator " + word);
break;
case parser_1.TokenType.number:
// console.log("number " + word);
break;
case parser_1.TokenType.index:
this.current_value = ValueHandler.sibling(this.current_value, word);
break;
case parser_1.TokenType.name:
this.current_value = ValueHandler.child(this.current_value, word);
break;
}
}
/**
* Sibling
*
* @remarks
* Extract array elements from index
*
* @param array - Array
* @param index - Index
* @returns Array member
*
*/
static sibling(array, index) {
let result = undefined;
if (Array.isArray(array)) {
result = array[Number(index)];
}
return result;
}
/**
* child
*
* @remarks
* Returns an object member.
*
* @param obj - Object
* @param attr - Attribute Name
* @returns Object member
*
*/
static child(obj, attr) {
let result = undefined;
if ((0, base_1.isContainer)(obj)) {
if (attr in obj) {
result = obj[attr];
}
}
return result;
}
}
exports.ValueHandler = ValueHandler;
/**
* Updater
*
* It actually traverses and updates objects.
*
* @remarks
*
*/
class Updater extends ValueHandler {
/**
*
* @remarks
*/
constructor(root_value, new_value) {
super(root_value);
this.new_value = new_value;
}
/**
* Symbol Handler
*
* @remarks
* Executed when Parser recognizes Token.
*
* @param type - Symbol Type
* @param word
* @param term
* @returns void
*
*/
token(type, word, term) {
if (this.current_value) {
switch (type) {
case parser_1.TokenType.index:
{
if (term) {
if (this.current_value.length > word) {
this.current_value[word] = this.new_value;
}
}
else {
this.current_value = Updater.sibling(this.current_value, word);
}
}
break;
case parser_1.TokenType.name:
{
if (term) {
this.current_value[word] = this.new_value;
}
else {
this.current_value = Updater.child(this.current_value, word);
}
}
break;
}
}
}
}
exports.Updater = Updater;
//# sourceMappingURL=handler.js.map