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LibJS: Add and begin using a completion-compatible string formatter

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The `deprecated_format` helper is a thin wrapper to map results from
AK::vformat to a throw completion. This will let us try to throw on OOM
conditions rather than just blowing up.

Note it's called `deprecated_format` as we will likely end up adding a
method named just `format` to return `ThrowCompletionOr<String>`, when
we begin the migration from DeprecatedString->String for LibJS.
This commit is contained in:
Timothy Flynn 2023-01-07 14:29:07 -05:00 • committed by Linus Groh
parent 6e1a239a62
commit 356e58332c
2 changed files with 31 additions and 2 deletions
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5
Userland/Libraries/LibJS/Runtime/StringPrototype.cpp
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@ -23,6 +23,7 @@
#include <LibJS/Runtime/StringIterator.h>
#include <LibJS/Runtime/StringObject.h>
#include <LibJS/Runtime/StringPrototype.h>
#include <LibJS/Runtime/ThrowableFormat.h>
#include <LibJS/Runtime/ThrowableStringBuilder.h>
#include <LibJS/Runtime/Utf16String.h>
#include <LibJS/Runtime/Value.h>
@ -536,8 +537,8 @@ static ThrowCompletionOr<Value> pad_string(VM& vm, Utf16String string, PadPlacem
auto filler = filler_builder.build();
auto formatted = placement == PadPlacement::Start
? DeprecatedString::formatted("{}{}", filler, string.view())
: DeprecatedString::formatted("{}{}", string.view(), filler);
? TRY(deprecated_format(vm, "{}{}", filler, string.view()))
: TRY(deprecated_format(vm, "{}{}", string.view(), filler));
return PrimitiveString::create(vm, move(formatted));
}

28
Userland/Libraries/LibJS/Runtime/ThrowableFormat.h Normal file
View file

@ -0,0 +1,28 @@
/*
* Copyright (c) 2023, Tim Flynn <trflynn89@serenityos.org>
*
* SPDX-License-Identifier: BSD-2-Clause
*/
#pragma once
#include <AK/CheckedFormatString.h>
#include <AK/DeprecatedString.h>
#include <AK/Format.h>
#include <LibJS/Runtime/Completion.h>
#include <LibJS/Runtime/ErrorTypes.h>
#include <LibJS/Runtime/VM.h>
namespace JS {
template<typename... Args>
ThrowCompletionOr<DeprecatedString> deprecated_format(VM& vm, CheckedFormatString<Args...>&& fmtstr, Args const&... args)
{
StringBuilder builder;
AK::VariadicFormatParams parameters { args... };
TRY_OR_THROW_OOM(vm, vformat(builder, fmtstr.view(), parameters));
return builder.to_deprecated_string();
}
}