{"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\/pl\/blog\/news\/re2c-4-0","title":{"rendered":"re2c 4.0","gt_translate_keys":[{"key":"rendered","format":"text"}]},"content":{"rendered":"<p><noindex>      <noindex><\/p>\n<p>We wtorek, 19 listopada, zaprezentowano wydanie <a rel=\"nofollow\" href=\"http:\/\/re2c.org\">re2c<\/a> \u2013 generator\u00f3w analizator\u00f3w leksykalnych (znany r\u00f3wnie\u017c jako kompilator wyra\u017ce\u0144 regularnych do kodu w docelowym j\u0119zyku programowania). re2c specjalizuje si\u0119 w generowaniu szybkich i \u0142atwo osadzanych leks\u00f3w. Od bardziej znanego odpowiednika flex r\u00f3\u017cni si\u0119 elastycznym interfejsem, generowaniem zoptymalizowanych leks\u00f3w bez tabel oraz wsparciem dla wyci\u0105gania poddopasowa\u0144 (submatch extraction) na podstawie deterministycznych automat\u00f3w sko\u0144czonych z etykiety (<a rel=\"nofollow\" href=\"https:\/\/arxiv.org\/abs\/2206.01398\">TDFA<\/a>). re2c jest wykorzystywane w projektach, w kt\u00f3rych kluczowa jest szybko\u015b\u0107 dzia\u0142ania leksykalnego analizatora, na przyk\u0142ad w Ninja i PHP.<\/p>\n<p><\/noindex><\/noindex>  <noindex><\/p>\n<p>W wersji 4.0 gruntownie przebudowano podsystem generowania kodu, co umo\u017cliwi\u0142o dodanie wsparcia dla o\u015bmiu nowych j\u0119zyk\u00f3w (D, Haskell, Java, JavaScript, OCaml, Python, V, Zig) opr\u00f3cz ju\u017c obs\u0142ugiwanych (C\/C++, Go, Rust), a tak\u017ce og\u00f3lnego mechanizmu dodawania nowych j\u0119zyk\u00f3w poprzez pliki konfiguracyjne. Generator kodu odpowiada za translacj\u0119 ju\u017c zbudowanego i zoptymalizowanego automatu sko\u0144czonego do kodu, czyli jego zadaniem jest wybranie odpowiednich dla docelowego j\u0119zyka konstrukcji steruj\u0105cych, typ\u00f3w danych, og\u00f3lnego modelu programu itd. Wcze\u015bniej ca\u0142a ta logika by\u0142a cz\u0119\u015bci\u0105 kodu \u017ar\u00f3d\u0142owego re2c, a aby j\u0105 zmieni\u0107 lub doda\u0107 nowy j\u0119zyk, nale\u017ca\u0142o zmienia\u0107 kod \u017ar\u00f3d\u0142owy i ponownie kompilowa\u0107 re2c. Takie \u0142atki nie by\u0142y akceptowane w g\u0142\u00f3wnym repozytorium bez wdro\u017cenia standardowego zestawu przyk\u0142ad\u00f3w i test\u00f3w, co dodatkowo komplikowa\u0142o ca\u0142y proces. Teraz ca\u0142a ta logika zosta\u0142a przeniesiona do <a rel=\"nofollow\" href=\"http:\/\/re2c.org\/manual\/manual_c.html#syntax-files\">plik\u00f3w syntaktycznych<\/a> \u2013 tekstowych plik\u00f3w konfiguracyjnych, kt\u00f3re mog\u0105 by\u0107 dostarczane przez u\u017cytkownika (domy\u015blnie re2c u\u017cywa standardowych). Kod \u017ar\u00f3d\u0142owy re2c jest ca\u0142kowicie wolny od szczeg\u00f3\u0142\u00f3w konkretnego j\u0119zyka i polega wy\u0142\u0105cznie na pliku sk\u0142adniowym. U\u017cytkownik mo\u017ce cz\u0119\u015bciowo nadpisywa\u0107 istniej\u0105cy plik sk\u0142adniowy lub napisa\u0107 nowy od zera. Dla wszystkich oficjalnie wspieranych j\u0119zyk\u00f3w s\u0105 dost\u0119pne <a rel=\"nofollow\" href=\"http:\/\/re2c.org\/manual\/manual.html\">pe\u0142na dokumentacja z przyk\u0142adami<\/a>.<\/p>\n<p><\/noindex> <noindex><\/p>\n<p>Przy okazji, sama idea plik\u00f3w syntaktycznych powsta\u0142a dzi\u0119ki <a rel=\"nofollow\" href=\"https:\/\/www.linux.org.ru\/news\/development\/16759268?cid=16762667\">jednemu komentarzowi na LORze<\/a>, za co dzi\u0119kujemy <img decoding=\"async\" alt=\"re2c 4.0\" src=\"\/wp-content\/uploads\/2024\/11\/2baa1e4f47df390d8591518a6bacc0da.png\" style=\"display:block;margin: 0 auto;\" \/><a rel=\"nofollow\" style=\"text-decoration: none\" href=\"https:\/\/www.linux.org.ru\/people\/the_coder\/profile\">the_coder<\/a>.<\/p>\n<p><\/noindex> <noindex><\/p>\n<p>W wydaniu wprowadzono wiele innych zmian maj\u0105cych na celu uproszczenie interfejsu u\u017cytkownika, popraw\u0119 pracy z grupami przechwytuj\u0105cymi (capturing groups), a tak\u017ce dodano \u015brodowisko online do edytowania i kompilowania przyk\u0142ad\u00f3w: <a rel=\"nofollow\" href=\"http:\/\/re2c.org\/playground\">http:\/\/re2c.org\/playground<\/a>.<\/p>\n<p><\/noindex><\/p>\n<p>\u0179r\u00f3d\u0142o: <a \ncontent=\"nofollow\" rel=\"nofollow\" href=\"https:\/\/www.linux.org.ru\/news\/development\/17798640\">linux.org.ru<\/a><\/p>","protected":false,"gt_translate_keys":[{"key":"rendered","format":"html"}]},"excerpt":{"rendered":"<p>\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 &ndash; \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 [&hellip;]<\/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<!-- All in One SEO 5.0.1.1 - aioseo.com -->\n\t<meta name=\"description\" content=\"\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 \u2013 \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 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