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Make \x the same as \X

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Up to now, in normal locales \x was essentially the same as \X, except
that it errored if given a value > 0x7f.

That's kind of annoying and useless.

A subtle change is that `\xHH` now represents the character (if any)
encoded by the byte value "HH", so even for values <= 0x7f if that's
not the same as the ASCII value we would diverge.

I do not believe anyone has ever run fish on a system where that
distinction matters. It isn't a thing for UTF-8, it isn't a thing for
ASCII, it isn't a thing for UTF-16, it isn't a thing for any extended
ASCII scheme - ISO8859-X, it isn't a thing for SHIFT-JIS.

I am reasonably certain we are making that same assumption in other
places.

Fixes #1352
This commit is contained in:
Fabian Boehm
2022-09-29 19:27:18 +02:00
parent 85d4834b35
commit 52dcfe11af
5 changed files with 12 additions and 26 deletions
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7
doc_src/language.rst
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@@ -107,11 +107,10 @@ Some characters cannot be written directly on the command line. For these charac
- ``\r`` represents the carriage return character.
- ``\t`` represents the tab character.
- ``\v`` represents the vertical tab character.
- ``\xHH``, where ``HH`` is a hexadecimal number, represents the ASCII character with the specified value. For example, ``\x9`` is the tab character.
- ``\XHH``, where ``HH`` is a hexadecimal number, represents a byte of data with the specified value. If you are using a multibyte encoding, this can be used to enter invalid strings. Only use this if you know what you are doing.
- ``\ooo``, where ``ooo`` is an octal number, represents the ASCII character with the specified value. For example, ``\011`` is the tab character.
- ``\xHH`` or ``\XHH``, where ``HH`` is a hexadecimal number, represents a byte of data with the specified value. For example, ``\x9`` is the tab character. If you are using a multibyte encoding, this can be used to enter invalid strings. Typically fish is run with the ASCII or UTF-8 encoding, so anything up to ``\X7f`` is an ASCII character.
- ``\ooo``, where ``ooo`` is an octal number, represents the ASCII character with the specified value. For example, ``\011`` is the tab character. The highest allowed value is ``\177``.
- ``\uXXXX``, where ``XXXX`` is a hexadecimal number, represents the 16-bit Unicode character with the specified value. For example, ``\u9`` is the tab character.
- ``\UXXXXXXXX``, where ``XXXXXXXX`` is a hexadecimal number, represents the 32-bit Unicode character with the specified value. For example, ``\U9`` is the tab character.
- ``\UXXXXXXXX``, where ``XXXXXXXX`` is a hexadecimal number, represents the 32-bit Unicode character with the specified value. For example, ``\U9`` is the tab character. The highest allowed value is \U10FFFF.
- ``\cX``, where ``X`` is a letter of the alphabet, represents the control sequence generated by pressing the control key and the specified letter. For example, ``\ci`` is the tab character
Some characters have special meaning to the shell. For example, an apostrophe ``'`` disables expansion (see :ref:`Quotes<quotes>`). To tell the shell to treat these characters literally, escape them with a backslash. For example, the command::