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vim-patch:6f85cec: runtime(python): update rendering of Unicode named literals in syntax script

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This change:

* enforces that the alias starts with a letter
* allows the other words in an alias to be separated by either a space
  or a hyphen, but not both or double separators
* allows only a letter after space, possibly followed by letters or
  digits
* allows both letters and digits after a hyphen

Tested with:

    a = '\N{Cyrillic Small Letter Zhe} is pronounced as zh in pleasure'
    b = '\N{NO-BREAK SPACE} is needed here'
    # ... other tests here
    r = '\N{HENTAIGANA LETTER E-1} is a Japanese hiragana letter archaic ye'
    s = '\N{CUNEIFORM SIGN NU11 TENU} is a correction alias'
    t = '\N{RECYCLING SYMBOL FOR TYPE-1 PLASTICS} base shape is a triangle'
    print(a)
    print(b)
    print(r)
    print(s)
    print(t)

The tests confirm the behavior and are selected from real Unicode
tables/aliases to check these combinations based on the specification.

fixes: vim/vim#17323
closes: vim/vim#17735

6f85cec4fb

Co-authored-by: Zvezdan Petkovic <zpetkovic@acm.org>
This commit is contained in:
Christian Clason
2025-07-13 10:42:22 +02:00
committed by Christian Clason
parent 3e7f5d95aa
commit 444a8b3ec6
1 changed files with 2 additions and 1 deletions
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3
runtime/syntax/python.vim
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@ -160,7 +160,8 @@ syn match pythonEscape "\\\o\{1,3}" contained
syn match pythonEscape "\\x\x\{2}" contained
syn match pythonEscape "\%(\\u\x\{4}\|\\U\x\{8}\)" contained
" Python allows case-insensitive Unicode IDs: http://www.unicode.org/charts/
syn match pythonEscape "\\N{\a\+\%(\s\a\+\)*}" contained
" The specification: https://www.unicode.org/versions/Unicode16.0.0/core-spec/chapter-4/#G135165
syn match pythonEscape "\\N{\a\+\%(\%(\s\a\+[[:alnum:]]*\)\|\%(-[[:alnum:]]\+\)\)*}" contained
syn match pythonEscape "\\$"
" It is very important to understand all details before changing the