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// Copyright 2021 the V8 project authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#include 'src/builtins/builtins-string-gen.h'
namespace string {
// https://tc39.es/ecma262/#sec-string.prototype.indexof
transitioning javascript builtin
StringPrototypeIndexOf(
js-implicit context: NativeContext, receiver: JSAny)(...arguments): Smi {
const methodName: constexpr string = 'String.prototype.indexOf';
const searchString: JSAny = arguments[0];
const position: JSAny = arguments[1];
// 1. Let O be ? RequireObjectCoercible(this value).
// 2. Let S be ? ToString(O).
const s = ToThisString(receiver, methodName);
// 3. Let searchStr be ? ToString(searchString).
const searchStr = ToString_Inline(searchString);
// 4. Let pos be ? ToIntegerOrInfinity(position).
// 5. Assert: If position is undefined, then pos is 0.
let start: Smi = 0;
if (position != Undefined) {
// 6. Let len be the length of S.
const len = s.length_uintptr;
// 7. Let start be the result of clamping pos between 0 and len.
StaticAssertStringLengthFitsSmi();
start = Convert<Smi>(Signed(ClampToIndexRange(position, len)));
}
// 8. Let index be ! StringIndexOf(S, searchStr, start).
return StringIndexOf(s, searchStr, start);
}
}
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