{"id":120643,"date":"2024-11-21T01:09:45","date_gmt":"2024-11-20T23:09:45","guid":{"rendered":"https:\/\/prohoster.info\/blog\/novosti-interneta\/re2c-4-0"},"modified":"2024-11-21T01:09:45","modified_gmt":"2024-11-20T23:09:45","slug":"re2c-4-0","status":"publish","type":"post","link":"https:\/\/prohoster.info\/cs\/blog\/news\/re2c-4-0","title":{"rendered":"re2c 4.0","gt_translate_keys":[{"key":"rendered","format":"text"}]},"content":{"rendered":"

<\/p>\n

V \u00fater\u00fd 19. listopadu byla vyd\u00e1na verze re2c<\/a> – gener\u00e1tor lexik\u00e1ln\u00edch analyz\u00e1tor\u016f (tak\u00e9 zn\u00e1m\u00fd jako kompil\u00e1tor regul\u00e1rn\u00edch v\u00fdraz\u016f do k\u00f3du v c\u00edlov\u00e9m programovac\u00edm jazyce). re2c se specializuje na generaci rychl\u00fdch a snadno vestaviteln\u00fdch lexe. Od sv\u00e9ho zn\u00e1m\u011bj\u0161\u00edho prot\u011bj\u0161ku flex se vyzna\u010duje flexibiln\u00edm rozhran\u00edm, generac\u00ed optimalizovan\u00fdch ne-tabulkov\u00fdch lex\u00e9r\u016f a podporou zachycen\u00ed (submatch extraction) na z\u00e1klad\u011b deterministick\u00fdch kone\u010dn\u00fdch automat\u016f s tagy (TDFA<\/a>). re2c se pou\u017e\u00edv\u00e1 v projektech, kde je d\u016fle\u017eit\u00e1 rychlost pr\u00e1ce lexeru, nap\u0159\u00edklad v Ninja a v PHP.<\/p>\n

<\/noindex><\/noindex> <\/p>\n

Ve verzi 4.0 byla zcela p\u0159epracov\u00e1na subsyst\u00e9m generace k\u00f3du, co\u017e umo\u017enilo p\u0159idat podporu osmi nov\u00fdm jazyk\u016fm (D, Haskell, Java, JavaScript, OCaml, Python, V, Zig) vedle ji\u017e podporovan\u00fdch (C\/C++, Go, Rust) a tak\u00e9 obecn\u00fd mechanismus p\u0159id\u00e1v\u00e1n\u00ed nov\u00fdch jazyk\u016f prost\u0159ednictv\u00edm konfigura\u010dn\u00edch soubor\u016f. K\u00f3degener\u00e1tor je zodpov\u011bdn\u00fd za translataci ji\u017e postaven\u00e9ho a optimalizovan\u00e9ho kone\u010dn\u00e9ho automatu do k\u00f3du, co\u017e znamen\u00e1, \u017ee jeho \u00fakolem je vybrat vhodn\u00e9 pro c\u00edlov\u00fd jazyk \u0159\u00eddic\u00ed konstrukce, datov\u00e9 typy, obecn\u00fd model programu atd. D\u0159\u00edve byla ve\u0161ker\u00e1 tato logika sou\u010d\u00e1st\u00ed zdrojov\u00e9ho k\u00f3du re2c a pro zm\u011bnu nebo p\u0159id\u00e1n\u00ed nov\u00e9ho jazyka bylo nutn\u00e9 upravovat zdrojov\u00fd k\u00f3d a p\u0159ehodnocovat re2c. Takov\u00e9 patchy nebyly p\u0159ij\u00edm\u00e1ny do hlavn\u00edho repozit\u00e1\u0159e bez implementace standardn\u00edho souboru p\u0159\u00edklad\u016f a test\u016f, co\u017e cel\u00fd proces nav\u00edc zt\u00ed\u017eilo. Nyn\u00ed byla ve\u0161ker\u00e1 tato logika p\u0159esunuta do syntaktick\u00fdch soubor\u016f<\/a> – textov\u00fdch konfigura\u010dn\u00edch soubor\u016f, kter\u00e9 mohou b\u00fdt poskytnuty u\u017eivateli (ve v\u00fdchoz\u00edm nastaven\u00ed re2c pou\u017e\u00edv\u00e1 standardn\u00ed). Zdrojov\u00fd k\u00f3d re2c je zcela osvobozen od detail\u016f konkr\u00e9tn\u00edho jazyka a spol\u00e9h\u00e1 se pouze na syntaktick\u00fd soubor. U\u017eivatel m\u016f\u017ee \u010d\u00e1ste\u010dn\u011b p\u0159epsat existuj\u00edc\u00ed syntaktick\u00fd soubor nebo napsat nov\u00fd od za\u010d\u00e1tku. Pro v\u0161echny ofici\u00e1ln\u011b podporovan\u00e9 jazyky existuj\u00ed \u00fapln\u00e1 dokumentace s p\u0159\u00edklady<\/a>.<\/p>\n

<\/noindex> <\/p>\n

Mimochodem, sama my\u0161lenka syntaktick\u00fdch soubor\u016f vznikla d\u00edky jednomu koment\u00e1\u0159i na LORu<\/a>, za co\u017e d\u011bkujeme \"re2cthe_coder<\/a>.<\/p>\n

<\/noindex> <\/p>\n

Do vyd\u00e1n\u00ed bylo zahrnuto mnoho dal\u0161\u00edch zm\u011bn zam\u011b\u0159en\u00fdch na zjednodu\u0161en\u00ed u\u017eivatelsk\u00e9ho rozhran\u00ed, zlep\u0161en\u00ed pr\u00e1ce se zachycuj\u00edc\u00edmi skupinami (capturing groups) a byla p\u0159id\u00e1na online platforma pro \u00fapravu a kompilaci p\u0159\u00edklad\u016f: http:\/\/re2c.org\/playground<\/a>.<\/p>\n

<\/noindex><\/p>\n

Zdroj: linux.org.ru<\/a><\/p>","protected":false,"gt_translate_keys":[{"key":"rendered","format":"html"}]},"excerpt":{"rendered":"

\u0412\u043e \u0432\u0442\u043e\u0440\u043d\u0438\u043a, 19 \u043d\u043e\u044f\u0431\u0440\u044f, \u043f\u0440\u0435\u0434\u0441\u0442\u0430\u0432\u043b\u0435\u043d \u0440\u0435\u043b\u0438\u0437 re2c – \u0433\u0435\u043d\u0435\u0440\u0430\u0442\u043e\u0440\u0430 \u043b\u0435\u043a\u0441\u0438\u0447\u0435\u0441\u043a\u0438\u0445 \u0430\u043d\u0430\u043b\u0438\u0437\u0430\u0442\u043e\u0440\u043e\u0432 (\u043e\u043d \u0436\u0435 \u043a\u043e\u043c\u043f\u0438\u043b\u044f\u0442\u043e\u0440 \u0440\u0435\u0433\u0443\u043b\u044f\u0440\u043d\u044b\u0445 \u0432\u044b\u0440\u0430\u0436\u0435\u043d\u0438\u0439 \u0432 \u043a\u043e\u0434 \u043d\u0430 \u0446\u0435\u043b\u0435\u0432\u043e\u043c \u044f\u0437\u044b\u043a\u0435 \u043f\u0440\u043e\u0433\u0440\u0430\u043c\u043c\u0438\u0440\u043e\u0432\u0430\u043d\u0438\u044f). re2c \u0441\u043f\u0435\u0446\u0438\u0430\u043b\u0438\u0437\u0438\u0440\u0443\u0435\u0442\u0441\u044f \u043d\u0430 \u0433\u0435\u043d\u0435\u0440\u0430\u0446\u0438\u0438 \u0431\u044b\u0441\u0442\u0440\u044b\u0445 \u0438 \u043b\u0435\u0433\u043a\u043e \u0432\u0441\u0442\u0440\u0430\u0438\u0432\u0430\u0435\u043c\u044b\u0445 \u043b\u0435\u043a\u0441\u0435\u0440\u043e\u0432. \u041e\u043d \u043e\u0442\u043b\u0438\u0447\u0430\u0435\u0442\u0441\u044f \u043e\u0442 \u0431\u043e\u043b\u0435\u0435 \u0438\u0437\u0432\u0435\u0441\u0442\u043d\u043e\u0433\u043e \u0430\u043d\u0430\u043b\u043e\u0433\u0430 flex \u0433\u0438\u0431\u043a\u0438\u043c \u0438\u043d\u0442\u0435\u0440\u0444\u0435\u0439\u0441\u043e\u043c, \u0433\u0435\u043d\u0435\u0440\u0430\u0446\u0438\u0435\u0439 \u043e\u043f\u0442\u0438\u043c\u0438\u0437\u0438\u0440\u043e\u0432\u0430\u043d\u043d\u044b\u0445 \u043d\u0435\u0442\u0430\u0431\u043b\u0438\u0447\u043d\u044b\u0445 \u043b\u0435\u043a\u0441\u0435\u0440\u043e\u0432 \u0438 \u043f\u043e\u0434\u0434\u0435\u0440\u0436\u043a\u043e\u0439 \u0437\u0430\u0445\u0432\u0430\u0442\u043e\u0432 (submatch extraction) \u043d\u0430 \u043e\u0441\u043d\u043e\u0432\u0435 \u0434\u0435\u0442\u0435\u0440\u043c\u0438\u043d\u0438\u0440\u043e\u0432\u0430\u043d\u043d\u044b\u0445 \u043a\u043e\u043d\u0435\u0447\u043d\u044b\u0445 \u0430\u0432\u0442\u043e\u043c\u0430\u0442\u043e\u0432 \u0441 […]<\/p>\n","protected":false,"gt_translate_keys":[{"key":"rendered","format":"html"}]},"author":1,"featured_media":120644,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[702],"tags":[],"class_list":["post-120643","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-news"],"aioseo_notices":[],"aioseo_head":"\n\t\t\n\t\n\t\n\t\n\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\n","aioseo_head_json":{"title":"\ud83e\udd47re2c 4.0 | ProHoster","description":"V \u00fater\u00fd 19. listopadu byla p\u0159edstavena verze re2c \u2013 gener\u00e1toru lexik\u00e1ln\u00edch analyz\u00e1tor\u016f (tak\u00e9 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