runtime(python): update rendering of Unicode named literals in syntax script

zvezdan · chrisbra · commit 6f85cec4fbc1 · 2025-07-13T08:23:24.000+02:00
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: #17323 closes: #17735 Signed-off-by: Christian Brabandt <cb@256bit.org>
diff --git a/runtime/syntax/python.vim b/runtime/syntax/python.vim
@@ -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: https://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
