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LibWeb: Implement an AO to normalize newlines in a string

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Timothy Flynn 2024-03-14 07:11:20 -04:00 committed by Andreas Kling
parent 324feb04e7
commit 1c0541d706
Notes: sideshowbarker 2024-07-16 21:39:23 +09:00 
Author: https://github.com/trflynn89
Commit: https://github.com/SerenityOS/serenity/commit/1c0541d706
Pull-request: https://github.com/SerenityOS/serenity/pull/23586
2 changed files with 25 additions and 0 deletions
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24
Userland/Libraries/LibWeb/Infra/Strings.cpp
View file

@ -8,6 +8,7 @@
*/
#include <AK/CharacterTypes.h>
#include <AK/GenericLexer.h>
#include <AK/String.h>
#include <AK/Utf16View.h>
#include <AK/Utf8View.h>
@ -24,6 +25,29 @@ bool is_ascii_case_insensitive_match(StringView a, StringView b)
return AK::StringUtils::equals_ignoring_ascii_case(a, b);
}
// https://infra.spec.whatwg.org/#normalize-newlines
String normalize_newlines(String const& string)
{
// To normalize newlines in a string, replace every U+000D CR U+000A LF code point pair with a single U+000A LF
// code point, and then replace every remaining U+000D CR code point with a U+000A LF code point.
if (!string.contains('\r'))
return string;
StringBuilder builder;
GenericLexer lexer { string };
while (!lexer.is_eof()) {
builder.append(lexer.consume_until('\r'));
if (lexer.peek() == '\r') {
lexer.ignore(1 + static_cast<size_t>(lexer.peek(1) == '\n'));
builder.append('\n');
}
}
return MUST(builder.to_string());
}
// https://infra.spec.whatwg.org/#strip-and-collapse-ascii-whitespace
ErrorOr<String> strip_and_collapse_whitespace(StringView string)
{

1
Userland/Libraries/LibWeb/Infra/Strings.h
View file

@ -14,6 +14,7 @@
namespace Web::Infra {
bool is_ascii_case_insensitive_match(StringView a, StringView b);
String normalize_newlines(String const&);
ErrorOr<String> strip_and_collapse_whitespace(StringView string);
bool is_code_unit_prefix(StringView potential_prefix, StringView input);
ErrorOr<String> convert_to_scalar_value_string(StringView string);