#!/usr/bin/env node

/**
 * @license
 * Copyright Google LLC All Rights Reserved.
 *
 * Use of this source code is governed by an MIT-style license that can be
 * found in the LICENSE file at https://angular.io/license
 */

var json = '';

if (require.main === module) {
 process.stdin.setEncoding('utf8');

 process.stdin.on('readable', () => {
 const chunk = process.stdin.read();
 if (chunk !== null) {
 json += chunk;
 }
 });

 process.stdin.on('end', () => {
 var obj = JSON.parse(json);
 var argv = process.argv.slice(2);
 extractPaths(obj, argv).forEach(function(line) {
 console.info(line);
 });
 });
}

function extractPaths(obj, paths) {
 var lines = [];
 paths.forEach(function(exp) {
 var objs = obj instanceof Array ? [].concat(obj) : [obj];
 exp.split('.').forEach(function(name) {
 for (var i = 0; i < objs.length; i++) {
 var o = objs[i];
 if (o instanceof Array) {
 // Expand and do over
 objs = objs.slice(0, i).concat(o).concat(objs.slice(i + 1, objs.length));
 i--;
 } else {
 name.split('=').forEach(function(name, index) {
 if (index == 0) {
 objs[i] = o = o[name];
 } else if (name.charAt(0) == '^') {
 if (o.indexOf(name.substr(1)) !== 0) {
 objs.splice(i, 1);
 i--;
 }
 }
 });
 }
 }
 });
 lines.push(objs.join('|'));
 });
 return lines;
}

exports.extractPaths = extractPaths;