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Add comments from Unicode to script_run()

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Karl Williamson 2025-12-24 10:55:23 -07:00
parent d15dd33d87
commit 976e22d2a3
1 changed files with 20 additions and 2 deletions
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regexec.c
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@ -11773,9 +11773,27 @@ Perl_isSCRIPT_RUN(pTHX_ const U8 * s, const U8 * send, const bool utf8_target)
* parallel, table that gives the number of entries in each aux table. * parallel, table that gives the number of entries in each aux table.
* These are all defined in charclass_invlists.inc */ * These are all defined in charclass_invlists.inc */
/* XXX Here are the additional things UTS 39 says could be done: /* XXX Here are the additional things UTS 39 (17.0
* https://unicode.org/reports/tr39/#Optional_Detection ) says could be
* done:
* *
* Forbid sequences of the same nonspacing mark * Check for unlikely sequences of combining marks:
* Forbid sequences of the same nonspacing mark.
* Forbid sequences of more than 4 nonspacing marks (gc=Mn or gc=Me).
* Forbid sequences of base character + nonspacing mark that look the
* same as or confusingly similar to the base character alone
* (because the nonspacing mark overlays a portion of the base
* character). An example is U+0069 LOWERCASE LETTER I + U+0307
* COMBINING DOT ABOVE.
* Add support for detecting two distinct sequences that have identical
* representations. The current data files only handle cases where a
* single code point is confusable with another code point or
* sequence. It does not handle cases like shri:
* The characters U+0BB6 TAMIL LETTER SHA and U+0BB8 TAMIL LETTER SA
* are normally quite distinct. However, they can both be used in the
* representation of the Tamil word shri. On some very common
* platforms, some sequences result in exactly the same visual
* appearance:
* *
* Check to see that all the characters are in the sets of exemplar * Check to see that all the characters are in the sets of exemplar
* characters for at least one language in the Unicode Common Locale Data * characters for at least one language in the Unicode Common Locale Data