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LibWeb: Implement spec-compliant integer parsing

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We have code inside LibWeb that uses the
`AK::StringUtils::convert_to_uint`and `AK::StringUtils::convert_to_int`
methods for parsing integers. This works well for the most part, but
according to the spec, trailing characters are allowed and should be
ignored, but this is not how the `StringUtil` methods are implemented.

This patch adds two new methods named `parse_integer` and
`parse_non_negative_integer` inside the `Web::HTML` namespace that uses
`StringUtils` under the hood but adds a bit more logic to make it spec
compliant.
This commit is contained in:
Jonatan Klemets 2023-07-23 19:38:04 +03:00 • committed by Sam Atkins
parent ebc5b33b77
commit 9812031a02
5 changed files with 208 additions and 0 deletions
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106
Tests/LibWeb/TestNumbers.cpp Normal file
View file

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/*
* Copyright (c) 2023, Jonatan Klemets <jonatan.r.klemets@gmail.com>
*
* SPDX-License-Identifier: BSD-2-Clause
*/
#include <LibTest/TestCase.h>
#include <LibWeb/HTML/Numbers.h>
TEST_CASE(parse_integer)
{
auto optional_value = Web::HTML::parse_integer(""sv);
EXPECT(!optional_value.has_value());
optional_value = Web::HTML::parse_integer("123"sv);
EXPECT(optional_value.has_value());
EXPECT_EQ(optional_value.value(), 123);
optional_value = Web::HTML::parse_integer(" 456"sv);
EXPECT(optional_value.has_value());
EXPECT_EQ(optional_value.value(), 456);
optional_value = Web::HTML::parse_integer("789 "sv);
EXPECT(optional_value.has_value());
EXPECT_EQ(optional_value.value(), 789);
optional_value = Web::HTML::parse_integer(" 22 "sv);
EXPECT(optional_value.has_value());
EXPECT_EQ(optional_value.value(), 22);
optional_value = Web::HTML::parse_integer(" \n\t31\t\t\n\n"sv);
EXPECT(optional_value.has_value());
EXPECT_EQ(optional_value.value(), 31);
optional_value = Web::HTML::parse_integer("765foo"sv);
EXPECT(optional_value.has_value());
EXPECT_EQ(optional_value.value(), 765);
optional_value = Web::HTML::parse_integer("3;"sv);
EXPECT(optional_value.has_value());
EXPECT_EQ(optional_value.value(), 3);
optional_value = Web::HTML::parse_integer("foo765"sv);
EXPECT(!optional_value.has_value());
optional_value = Web::HTML::parse_integer("1"sv);
EXPECT(optional_value.has_value());
EXPECT_EQ(optional_value.value(), 1);
optional_value = Web::HTML::parse_integer("+2"sv);
EXPECT(optional_value.has_value());
EXPECT_EQ(optional_value.value(), 2);
optional_value = Web::HTML::parse_integer("-3"sv);
EXPECT(optional_value.has_value());
EXPECT_EQ(optional_value.value(), -3);
}
TEST_CASE(parse_non_negative_integer)
{
auto optional_value = Web::HTML::parse_non_negative_integer(""sv);
EXPECT(!optional_value.has_value());
optional_value = Web::HTML::parse_non_negative_integer("123"sv);
EXPECT(optional_value.has_value());
EXPECT_EQ(optional_value.value(), 123u);
optional_value = Web::HTML::parse_non_negative_integer(" 456"sv);
EXPECT(optional_value.has_value());
EXPECT_EQ(optional_value.value(), 456u);
optional_value = Web::HTML::parse_non_negative_integer("789 "sv);
EXPECT(optional_value.has_value());
EXPECT_EQ(optional_value.value(), 789u);
optional_value = Web::HTML::parse_non_negative_integer(" 22 "sv);
EXPECT(optional_value.has_value());
EXPECT_EQ(optional_value.value(), 22u);
optional_value = Web::HTML::parse_non_negative_integer(" \n\t31\t\t\n\n"sv);
EXPECT(optional_value.has_value());
EXPECT_EQ(optional_value.value(), 31u);
optional_value = Web::HTML::parse_non_negative_integer("765foo"sv);
EXPECT(optional_value.has_value());
EXPECT_EQ(optional_value.value(), 765u);
optional_value = Web::HTML::parse_non_negative_integer("3;"sv);
EXPECT(optional_value.has_value());
EXPECT_EQ(optional_value.value(), 3u);
optional_value = Web::HTML::parse_non_negative_integer("foo765"sv);
EXPECT(!optional_value.has_value());
optional_value = Web::HTML::parse_non_negative_integer("1"sv);
EXPECT(optional_value.has_value());
EXPECT_EQ(optional_value.value(), 1u);
optional_value = Web::HTML::parse_non_negative_integer("+2"sv);
EXPECT(optional_value.has_value());
EXPECT_EQ(optional_value.value(), 2u);
optional_value = Web::HTML::parse_non_negative_integer("-3"sv);
EXPECT(!optional_value.has_value());
}