Previously, `URLParser` was constructing a new String for every
character of the URL's username and password. This change improves
performance by eliminating those unnecessary String allocations.
A URL with a 100,000 character password can now be parsed in ~30ms vs
~8 seconds previously on my machine.
I added some spec comments, and implementation notices, this should not
change behavior in a significant way.
The previous code was quite unwieldy and repetitive.
The long `if(next_is('X'))` chain is now a smaller `switch`.
I also reinstated the fast path for long sequences of literal
characters, which was broken in 0aad21fff2
Consider the following:
JsonValue value { JsonValue::Type::Object };
value.as_object().set("foo"sv, "bar"sv);
The JsonValue(Type) constructor does not initialize the underlying union
that stores its value. Thus JsonValue::as_object() will A) refer to an
uninitialized union member, B) deference that member.
This constructor only has 2 users, both of which initialize the type to
Type::Null. Rather than implementing unused functionality here, replace
those uses with the default JsonValue constructor, and remove the faulty
constructor.
The fun pattern of `union { struct { u32 a : 1; u64 b : 7; }; u8 x; }`
produces complete garbage on windows, this commit fixes the two
instances of those that exist in AK.
This commit also makes sure that the generated unions have the correct
size (whereas FloatExtractor<f32> previously did not!) by adding some
nice static_asserts.
Previously we assumed a default precision of 6, which made the printed
values quite odd in some cases.
This commit changes that default to print them with just enough
precision to produce the exact same float when roundtripped.
This commit adds some new tests that assert exact format outputs, which
have to be modified if we decide to change the default behaviour.
The slugify function is used to convert input into URL-friendly slugs.
It processes each character in the input, keeping ascii alpha characters
after lowercase and replacing non-alphanum characters with the glue
character or a space if multiple spaces are encountered consecutively.
The resulting string is trimmed of leading and trailing whitespace, and
any internal whitespace is replaced with the glue character.
It is currently used in LibMarkdown headings generation code.
The backtrace execinfo API takes the number of addresses the result
buffer can hold instead of its size, for some reason. Previously
backtraces larger than 256 frames deep would write past the end of the
result buffer.
Instead of implementing this inline, put it into a function. Use this
new function to correctly implement shortening paths for some places
where this logic was previously missing.
Before these changes, the pathname for the included test was incorrectly
being set to '/' as we were not considering the windows drive letter.
Fixed the issue in StringUtils::convert_to_floating_point() where the
end pointer of the trimmed string was not being passed, causing the
function to consistently return 'None' when given strings with trailing
whitespaces.
There were 2 issues with the way we formatted floating point decimals:
if the part after the decimal point exceeded the max of an u64 we would
generate wildly incorrect decimals, and we applied no rounding.
With this new code, we emit decimals one by one and perform a simple
reverse string walk to round the number up if required.
Prior to this commit, constructing a DS from a null DFS would cause a
nullptr deref, which broke (at least) Profiler.
This commit converts the null DFS to an empty DS, avoiding the nullptr
deref (until DFS loses its null state, or we decide to not make it
convertible to a DS).
This commit removes DeprecatedString's "null" state, and replaces all
its users with one of the following:
- A normal, empty DeprecatedString
- Optional<DeprecatedString>
Note that null states of DeprecatedFlyString/StringView/etc are *not*
affected by this commit. However, DeprecatedString::empty() is now
considered equal to a null StringView.
This function was an artifact from when we were using DeprecatedString
much more in URL class before porting to Optional<String>, where we no
longer rely on the null state of DeprecatedString.
The original doc comment was mistakenly copy-pasted from
count_leading_zeroes_safe, and incorrect. The function is doing
something else: it's counting _trailing_ zeroes instead of _leading_
ones.
The mentioned functions used m_size / 8 instead of size_in_bytes()
(division with ceiling rounding mode), which resulted in an off-by-one
error such that the functions didn't search in the last not-fully-8-bits
byte.
Using size_in_bytes() instead of m_size / 8 fixes this.
When working with FixedMemoryStreams, and especially MappedFiles, you
may don't want to copy the underlying data when you read from the
stream. Pointing into that data is perfectly fine as long as you know
the lifetime of it is long enough.
This commit adds a couple of methods for reading either a single value,
or a span of them, in this way. As noted, for single values you sadly
get a raw pointer instead of a reference, but that's the only option
right now.
Previously, the first match index was not checked to see if the camel
case or separator bonuses applied. The camel case bonus could also be
incorrectly applied where strings had non-alphabetical characters.
SipHash is highly HashDoS-resistent, initialized with a random seed at
startup (i.e. non-deterministic) and usable for security-critical use
cases with large enough parameters. We just use it because it's
reasonably secure with parameters 1-3 while having excellent properties
and not being significantly slower than before.
Instead of ballooning the size of the Function object, simply place the
callable on the heap with a properly aligned address.
This brings the alignment of Function down from ridiculous sizes like 64
bytes down to a manageable 8 bytes.
…kernel"
This reverts commit d4d92184b3.
The alignemnt requirements imposed by this are overkill at best and
ridiculous at worst, a future commit will tackle this problem in a
different, more space-efficient way.
