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It's sometimes useful to get the input from the lexer instead of wiring
it all the way down to where it's needed.
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We have a new, improved string type coming up in AK (OOM aware, no null
state), and while it's going to use UTF-8, the name UTF8String is a
mouthful - so let's free up the String name by renaming the existing
class.
Making the old one have an annoying name will hopefully also help with
quick adoption :^)
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This patch adds the `USING_AK_GLOBALLY` macro which is enabled by
default, but can be overridden by build flags.
This is a step towards integrating Jakt and AK types.
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Each of these strings would previously rely on StringView's char const*
constructor overload, which would call __builtin_strlen on the string.
Since we now have operator ""sv, we can replace these with much simpler
versions. This opens the door to being able to remove
StringView(char const*).
No functional changes.
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This commit moves the length calculations out to be directly on the
StringView users. This is an important step towards the goal of removing
StringView(char const*), as it moves the responsibility of calculating
the size of the string to the user of the StringView (which will prevent
naive uses causing OOB access).
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It's often useful to have the negated version, so instead of making a
local lambda for it, let's just add the negated form too.
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These APIs are only used by userland, and String is OOM-infallible,
so let's just ifdef it out of the Kernel.
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This allows us to skip a strlen call.
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This parsing is already duplicated between LibJS and LibRegex, and will
shortly be needed in more places in those libraries. Move it to AK to
prevent further duplication.
This API will consume escaped Unicode code points of the form:
\\u{code point}
\\unnnn (where each n is a hexadecimal digit)
\\unnnn\\unnnn (where the two escaped values are a surrogate pair)
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This method can be used to rewind a constant amount backwards in the
source instead of one by one with retract()
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Problem:
- Much of the `GenericLexer` can be `constexpr`, but is not.
Solution:
- Make it `constexpr` and de-duplicate code.
- Extend some of `StringView` with `constexpr` to support.
- Add tests to ensure `constexpr` behavior.
Note:
- Construction of `StringView` from pointer and length is not
`constexpr`-compatible at the moment because the VERIFY cannot be,
yet.
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SPDX License Identifiers are a more compact / standardized
way of representing file license information.
See: https://spdx.dev/resources/use/#identifiers
This was done with the `ambr` search and replace tool.
ambr --no-parent-ignore --key-from-file --rep-from-file key.txt rep.txt *
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This allows going back one character at a time, and then re-consume
previously consumed chars.
The code I need this for looks something like this:
ASSERT(lexer.consume_specific('\\'));
if (lexer.next_is("foo"))
...
lexer.retreat();
lexer.consume_escaped_character(); // This expects lexer.peek() == '\\'
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...and use it in `consume_and_unescape_string()'.
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This finally takes care of the kind-of excessive boilerplate code that were the
ctype adapters. On the other hand, I had to link `LibC/ctype.cpp` to the Kernel
(for `AK/JsonParser.cpp` and `AK/Format.cpp`). The previous commit actually makes
sense now: the `string.h` includes in `ctype.{h,cpp}` would require to link more LibC
stuff to the Kernel when it only needs the `_ctype_` array of `ctype.cpp`, and there
wasn't any string stuff used in ctype.
Instead of all this I could have put static derivatives of `is_any_of()` in the
concerned AK files, however that would have meant more boilerplate and workarounds;
so I went for the Kernel approach.
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Since commit 1ec59f28cea56f1afced0994127e2df62300e618 turns the ctype macros
into functions we can now feed them directly to a GenericLexer! This will lead to
removing the ctype adapters that were kind-of excessive boilerplate, but needed as
the Kernel doesn't compile with the LibC.
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The `consume_quoted_string()` can now take an escape character. This allows it
(for example) to capture a string's enclosing quotes. The escape character is
optional by default.
You can also consume and unescape a quoted string with the eponymous method
`consume_and_unescape_string()`. It takes an escape character as parameter
(backslash by default). It builds a String in which common escape sequences
get... unescaped :^) (e.g. \n, \r, \t...).
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This is useful for debugging with printf :^).
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