https://gcc.gnu.org/bugzilla/show_bug.cgi?id=106648
--- Comment #4 from CVS Commits <cvs-commit at gcc dot gnu.org> --- The master branch has been updated by Jakub Jelinek <ja...@gcc.gnu.org>: https://gcc.gnu.org/g:eb4879ab9053085a59b8d1594ef76487948bba7e commit r13-2212-geb4879ab9053085a59b8d1594ef76487948bba7e Author: Jakub Jelinek <ja...@redhat.com> Date: Fri Aug 26 09:24:56 2022 +0200 c++: Implement C++23 P2071R2 - Named universal character escapes [PR106648] The following patch implements the C++23 P2071R2 - Named universal character escapes paper to support \N{LATIN SMALL LETTER E} etc. I've used Unicode 14.0, there are 144803 character name properties (including the ones generated by Unicode NR1 and NR2 rules) and correction/control/alternate aliases, together with zero terminators that would be 3884745 bytes, which is clearly unacceptable for libcpp. This patch instead contains a generator which from the UnicodeData.txt and NameAliases.txt files emits a space optimized radix tree (208765 bytes long for 14.0), a single string literal dictionary (59418 bytes), maximum name length (currently 88 chars) and two small helper arrays for the NR1/NR2 name generation. The radix tree needs 2 to 9 bytes per node, the exact format is described in the generator program. There could be ways to shrink the dictionary size somewhat at the expense of slightly slower lookups. Currently the patch implements strict matching (that is what is needed to actually implement it on valid code) and Unicode UAX44-LM2 algorithm loose matching to provide hints (that algorithm essentially ignores hyphens in between two alphanumeric characters, spaces and underscores (with one exception for hyphen) and does case insensitive matching). In the attachment is a WIP patch that shows how to implement also spellcheck.{h,cc} style discovery of misspellings, but I'll need to talk to David Malcolm about it, as spellcheck.{h,cc} is in gcc/ subdir (so the WIP incremental patch instead prints all the names to stderr). 2022-08-26 Jakub Jelinek <ja...@redhat.com> PR c++/106648 libcpp/ * charset.cc: Implement C++23 P2071R2 - Named universal character escapes. Include uname2c.h. (hangul_syllables, hangul_count): New variables. (struct uname2c_data): New type. (_cpp_uname2c, _cpp_uname2c_uax44_lm2): New functions. (_cpp_valid_ucn): Use them. Handle named universal character escapes. (convert_ucn): Adjust comment. (convert_escape): Call convert_ucn even for \N. (_cpp_interpret_identifier): Handle named universal character escapes. * lex.cc (get_bidi_ucn): Fix up function comment formatting. (get_bidi_named): New function. (forms_identifier_p, lex_string): Handle named universal character escapes. * makeuname2c.cc: New file. Small parts copied from makeucnid.cc. * uname2c.h: New generated file. gcc/c-family/ * c-cppbuiltin.cc (c_cpp_builtins): Predefine __cpp_named_character_escapes to 202207L. gcc/testsuite/ * c-c++-common/cpp/named-universal-char-escape-1.c: New test. * c-c++-common/cpp/named-universal-char-escape-2.c: New test. * c-c++-common/cpp/named-universal-char-escape-3.c: New test. * c-c++-common/cpp/named-universal-char-escape-4.c: New test. * c-c++-common/Wbidi-chars-25.c: New test. * gcc.dg/cpp/named-universal-char-escape-1.c: New test. * gcc.dg/cpp/named-universal-char-escape-2.c: New test. * g++.dg/cpp/named-universal-char-escape-1.C: New test. * g++.dg/cpp/named-universal-char-escape-2.C: New test. * g++.dg/cpp23/feat-cxx2b.C: Test __cpp_named_character_escapes.
