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Big Change Update
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yeongpin
287
uBlock0.chromium/js/resources/set-constant.js
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287
uBlock0.chromium/js/resources/set-constant.js
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/*******************************************************************************
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uBlock Origin - a comprehensive, efficient content blocker
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Copyright (C) 2019-present Raymond Hill
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This program is free software: you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation, either version 3 of the License, or
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(at your option) any later version.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with this program. If not, see {http://www.gnu.org/licenses/}.
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Home: https://github.com/gorhill/uBlock
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*/
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import { registerScriptlet } from './base.js';
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import { runAt } from './run-at.js';
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import { safeSelf } from './safe-self.js';
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/******************************************************************************/
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export function validateConstantFn(trusted, raw, extraArgs = {}) {
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const safe = safeSelf();
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let value;
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if ( raw === 'undefined' ) {
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value = undefined;
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} else if ( raw === 'false' ) {
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value = false;
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} else if ( raw === 'true' ) {
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value = true;
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} else if ( raw === 'null' ) {
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value = null;
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} else if ( raw === "''" || raw === '' ) {
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value = '';
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} else if ( raw === '[]' || raw === 'emptyArr' ) {
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value = [];
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} else if ( raw === '{}' || raw === 'emptyObj' ) {
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value = {};
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} else if ( raw === 'noopFunc' ) {
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value = function(){};
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} else if ( raw === 'trueFunc' ) {
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value = function(){ return true; };
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} else if ( raw === 'falseFunc' ) {
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value = function(){ return false; };
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} else if ( raw === 'throwFunc' ) {
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value = function(){ throw ''; };
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} else if ( /^-?\d+$/.test(raw) ) {
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value = parseInt(raw);
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if ( isNaN(raw) ) { return; }
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if ( Math.abs(raw) > 0x7FFF ) { return; }
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} else if ( trusted ) {
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if ( raw.startsWith('json:') ) {
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try { value = safe.JSON_parse(raw.slice(5)); } catch(ex) { return; }
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} else if ( raw.startsWith('{') && raw.endsWith('}') ) {
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try { value = safe.JSON_parse(raw).value; } catch(ex) { return; }
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}
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} else {
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return;
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}
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if ( extraArgs.as !== undefined ) {
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if ( extraArgs.as === 'function' ) {
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return ( ) => value;
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} else if ( extraArgs.as === 'callback' ) {
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return ( ) => (( ) => value);
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} else if ( extraArgs.as === 'resolved' ) {
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return Promise.resolve(value);
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} else if ( extraArgs.as === 'rejected' ) {
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return Promise.reject(value);
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}
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}
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return value;
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}
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registerScriptlet(validateConstantFn, {
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name: 'validate-constant.fn',
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dependencies: [
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safeSelf,
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],
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});
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/******************************************************************************/
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export function setConstantFn(
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trusted = false,
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chain = '',
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rawValue = ''
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) {
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if ( chain === '' ) { return; }
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const safe = safeSelf();
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const logPrefix = safe.makeLogPrefix('set-constant', chain, rawValue);
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const extraArgs = safe.getExtraArgs(Array.from(arguments), 3);
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function setConstant(chain, rawValue) {
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const trappedProp = (( ) => {
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const pos = chain.lastIndexOf('.');
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if ( pos === -1 ) { return chain; }
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return chain.slice(pos+1);
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})();
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const cloakFunc = fn => {
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safe.Object_defineProperty(fn, 'name', { value: trappedProp });
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return new Proxy(fn, {
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defineProperty(target, prop) {
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if ( prop !== 'toString' ) {
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return Reflect.defineProperty(...arguments);
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}
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return true;
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},
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deleteProperty(target, prop) {
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if ( prop !== 'toString' ) {
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return Reflect.deleteProperty(...arguments);
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}
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return true;
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},
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get(target, prop) {
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if ( prop === 'toString' ) {
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return function() {
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return `function ${trappedProp}() { [native code] }`;
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}.bind(null);
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}
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return Reflect.get(...arguments);
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},
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});
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};
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if ( trappedProp === '' ) { return; }
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const thisScript = document.currentScript;
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let normalValue = validateConstantFn(trusted, rawValue, extraArgs);
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if ( rawValue === 'noopFunc' || rawValue === 'trueFunc' || rawValue === 'falseFunc' ) {
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normalValue = cloakFunc(normalValue);
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}
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let aborted = false;
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const mustAbort = function(v) {
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if ( trusted ) { return false; }
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if ( aborted ) { return true; }
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aborted =
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(v !== undefined && v !== null) &&
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(normalValue !== undefined && normalValue !== null) &&
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(typeof v !== typeof normalValue);
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if ( aborted ) {
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safe.uboLog(logPrefix, `Aborted because value set to ${v}`);
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}
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return aborted;
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};
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// https://github.com/uBlockOrigin/uBlock-issues/issues/156
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// Support multiple trappers for the same property.
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const trapProp = function(owner, prop, configurable, handler) {
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if ( handler.init(configurable ? owner[prop] : normalValue) === false ) { return; }
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const odesc = safe.Object_getOwnPropertyDescriptor(owner, prop);
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let prevGetter, prevSetter;
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if ( odesc instanceof safe.Object ) {
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owner[prop] = normalValue;
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if ( odesc.get instanceof Function ) {
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prevGetter = odesc.get;
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}
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if ( odesc.set instanceof Function ) {
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prevSetter = odesc.set;
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}
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}
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try {
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safe.Object_defineProperty(owner, prop, {
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configurable,
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get() {
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if ( prevGetter !== undefined ) {
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prevGetter();
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}
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return handler.getter();
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},
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set(a) {
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if ( prevSetter !== undefined ) {
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prevSetter(a);
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}
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handler.setter(a);
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}
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});
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safe.uboLog(logPrefix, 'Trap installed');
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} catch(ex) {
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safe.uboErr(logPrefix, ex);
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}
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};
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const trapChain = function(owner, chain) {
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const pos = chain.indexOf('.');
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if ( pos === -1 ) {
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trapProp(owner, chain, false, {
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v: undefined,
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init: function(v) {
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if ( mustAbort(v) ) { return false; }
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this.v = v;
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return true;
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},
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getter: function() {
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if ( document.currentScript === thisScript ) {
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return this.v;
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}
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safe.uboLog(logPrefix, 'Property read');
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return normalValue;
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},
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setter: function(a) {
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if ( mustAbort(a) === false ) { return; }
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normalValue = a;
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}
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});
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return;
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}
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const prop = chain.slice(0, pos);
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const v = owner[prop];
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chain = chain.slice(pos + 1);
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if ( v instanceof safe.Object || typeof v === 'object' && v !== null ) {
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trapChain(v, chain);
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return;
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}
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trapProp(owner, prop, true, {
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v: undefined,
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init: function(v) {
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this.v = v;
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return true;
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},
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getter: function() {
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return this.v;
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},
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setter: function(a) {
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this.v = a;
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if ( a instanceof safe.Object ) {
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trapChain(a, chain);
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}
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}
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});
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};
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trapChain(window, chain);
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}
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runAt(( ) => {
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setConstant(chain, rawValue);
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}, extraArgs.runAt);
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}
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registerScriptlet(setConstantFn, {
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name: 'set-constant.fn',
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dependencies: [
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runAt,
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safeSelf,
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validateConstantFn,
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],
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});
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/******************************************************************************/
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export function setConstant(
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...args
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) {
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setConstantFn(false, ...args);
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}
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registerScriptlet(setConstant, {
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name: 'set-constant.js',
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aliases: [
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'set.js',
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],
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dependencies: [
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setConstantFn,
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],
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});
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/*******************************************************************************
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*
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* trusted-set-constant.js
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*
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* Set specified property to any value. This is essentially the same as
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* set-constant.js, but with no restriction as to which values can be used.
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*
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**/
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export function trustedSetConstant(
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...args
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) {
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setConstantFn(true, ...args);
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}
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registerScriptlet(trustedSetConstant, {
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name: 'trusted-set-constant.js',
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requiresTrust: true,
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aliases: [
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'trusted-set.js',
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],
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dependencies: [
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setConstantFn,
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],
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});
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