1// Copyright 2021 the V8 project authors. All rights reserved. 2// Use of this source code is governed by a BSD-style license that can be 3// found in the LICENSE file. 4 5#include 'src/builtins/builtins-string-gen.h' 6 7namespace string { 8 9// https://tc39.es/ecma262/#sec-string.prototype.includes 10transitioning javascript builtin 11StringPrototypeIncludes(js-implicit context: NativeContext, receiver: JSAny)( 12 ...arguments): Boolean { 13 const methodName: constexpr string = 'String.prototype.includes'; 14 const searchString: JSAny = arguments[0]; 15 const position: JSAny = arguments[1]; 16 17 // 1. Let O be ? RequireObjectCoercible(this value). 18 // 2. Let S be ? ToString(O). 19 const s = ToThisString(receiver, methodName); 20 21 // 3. Let isRegExp be ? IsRegExp(searchString). 22 // 4. If isRegExp is true, throw a TypeError exception. 23 if (regexp::IsRegExp(searchString)) { 24 ThrowTypeError(MessageTemplate::kFirstArgumentNotRegExp, methodName); 25 } 26 27 // 5. Let searchStr be ? ToString(searchString). 28 const searchStr = ToString_Inline(searchString); 29 30 // 6. Let pos be ? ToIntegerOrInfinity(position). 31 // 7. Assert: If position is undefined, then pos is 0. 32 let start: Smi = 0; 33 if (position != Undefined) { 34 // 8. Let len be the length of S. 35 const len = s.length_uintptr; 36 37 // 9. Let start be the result of clamping pos between 0 and len. 38 StaticAssertStringLengthFitsSmi(); 39 start = Convert<Smi>(Signed(ClampToIndexRange(position, len))); 40 } 41 42 // 10. Let index be ! StringIndexOf(S, searchStr, start). 43 const index = StringIndexOf(s, searchStr, start); 44 45 // 11. If index is not -1, return true. 46 // 12. Return false. 47 return index != -1 ? True : False; 48} 49} 50