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/*******************************************************************************
uBlock Origin - a comprehensive, efficient content blocker
Copyright (C) 2019-present Raymond Hill
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 {http://www.gnu.org/licenses/}.
Home: https://github.com/gorhill/uBlock
*/
import { registerScriptlet } from './base.js';
/******************************************************************************/
export function proxyApplyFn(
target = '',
handler = ''
) {
let context = globalThis;
let prop = target;
for (;;) {
const pos = prop.indexOf('.');
if ( pos === -1 ) { break; }
context = context[prop.slice(0, pos)];
if ( context instanceof Object === false ) { return; }
prop = prop.slice(pos+1);
}
const fn = context[prop];
if ( typeof fn !== 'function' ) { return; }
if ( proxyApplyFn.CtorContext === undefined ) {
proxyApplyFn.ctorContexts = [];
proxyApplyFn.CtorContext = class {
constructor(...args) {
this.init(...args);
}
init(callFn, callArgs) {
this.callFn = callFn;
this.callArgs = callArgs;
return this;
}
reflect() {
const r = Reflect.construct(this.callFn, this.callArgs);
this.callFn = this.callArgs = this.private = undefined;
proxyApplyFn.ctorContexts.push(this);
return r;
}
static factory(...args) {
return proxyApplyFn.ctorContexts.length !== 0
? proxyApplyFn.ctorContexts.pop().init(...args)
: new proxyApplyFn.CtorContext(...args);
}
};
proxyApplyFn.applyContexts = [];
proxyApplyFn.ApplyContext = class {
constructor(...args) {
this.init(...args);
}
init(callFn, thisArg, callArgs) {
this.callFn = callFn;
this.thisArg = thisArg;
this.callArgs = callArgs;
return this;
}
reflect() {
const r = Reflect.apply(this.callFn, this.thisArg, this.callArgs);
this.callFn = this.thisArg = this.callArgs = this.private = undefined;
proxyApplyFn.applyContexts.push(this);
return r;
}
static factory(...args) {
return proxyApplyFn.applyContexts.length !== 0
? proxyApplyFn.applyContexts.pop().init(...args)
: new proxyApplyFn.ApplyContext(...args);
}
};
}
const fnStr = fn.toString();
const toString = (function toString() { return fnStr; }).bind(null);
const proxyDetails = {
apply(target, thisArg, args) {
return handler(proxyApplyFn.ApplyContext.factory(target, thisArg, args));
},
get(target, prop) {
if ( prop === 'toString' ) { return toString; }
return Reflect.get(target, prop);
},
};
if ( fn.prototype?.constructor === fn ) {
proxyDetails.construct = function(target, args) {
return handler(proxyApplyFn.CtorContext.factory(target, args));
};
}
context[prop] = new Proxy(fn, proxyDetails);
}
registerScriptlet(proxyApplyFn, {
name: 'proxy-apply.fn',
});
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