{"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\/sk\/blog\/news\/re2c-4-0","title":{"rendered":"re2c 4.0","gt_translate_keys":[{"key":"rendered","format":"text"}]},"content":{"rendered":"

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V utorok, 19. novembra, bol predstaven\u00fd release re2c<\/a> – gener\u00e1tor lexik\u00e1lnych analyz\u00e1torov (zn\u00e1my aj ako kompil\u00e1tor regul\u00e1rnych v\u00fdrazov na k\u00f3d v cie\u013eovom programovacom jazyku). re2c sa \u0161pecializuje na generovanie r\u00fdchlych a \u013eahko integrovan\u00fdch lex\u00e9rov. Vynik\u00e1 oproti zn\u00e1memu anal\u00f3gu flex flexibiln\u00fdm rozhran\u00edm, generovan\u00edm optimalizovan\u00fdch netabulkov\u00fdch lex\u00e9rov a podporou extrakcie submatch (submatch extraction) na z\u00e1klade deterministick\u00fdch kone\u010dn\u00fdch automatov s tagmi (TDFA<\/a>). re2c sa pou\u017e\u00edva v projektoch, kde je d\u00f4le\u017eit\u00e1 r\u00fdchlos\u0165 prev\u00e1dzky lex\u00e9rov, napr\u00edklad v Ninja a PHP.<\/p>\n

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

V vydan\u00ed 4.0 bola z\u00e1sadne prepracovan\u00e1 subsyst\u00e9m generovania k\u00f3du, \u010do umo\u017enilo prida\u0165 podporu pre osem nov\u00fdch jazykov (D, Haskell, Java, JavaScript, OCaml, Python, V, Zig) okrem u\u017e podporovan\u00fdch (C\/C++, Go, Rust), ako aj v\u0161eobecn\u00fd mechanizmus pridania nov\u00fdch jazykov cez konfigura\u010dn\u00e9 s\u00fabory. K\u00f3dov\u00fd gener\u00e1tor zodpoved\u00e1 za transl\u00e1ciu u\u017e vytvoren\u00e9ho a optimalizovan\u00e9ho kone\u010dn\u00e9ho automatu na k\u00f3d, to znamen\u00e1, \u017ee jeho \u00falohou je vybra\u0165 vhodn\u00e9 riadiace kon\u0161trukcie, typy d\u00e1t, v\u0161eobecn\u00fd model programu, at\u010f. Predt\u00fdm bola cel\u00e1 t\u00e1to logika s\u00fa\u010das\u0165ou zdrojov\u00e9ho k\u00f3du re2c, a aby sa to zmenilo alebo pridal nov\u00fd jazyk, bolo potrebn\u00e9 upravova\u0165 zdrojov\u00fd k\u00f3d a rekompilova\u0165 re2c. Tak\u00e9to patche neboli prij\u00edman\u00e9 do hlavn\u00e9ho repozit\u00e1ra bez implement\u00e1cie \u0161tandardn\u00e9ho s\u00faboru pr\u00edkladov a testov, \u010do \u010falej komplikovalo cel\u00fd proces. Teraz je cel\u00e1 t\u00e1to logika prenesen\u00e1 do syntaktick\u00fdch s\u00faborov<\/a> – textov\u00fdch konfigura\u010dn\u00fdch s\u00faborov, ktor\u00e9 m\u00f4\u017ee poskytn\u00fa\u0165 pou\u017e\u00edvate\u013e (predvolene re2c pou\u017e\u00edva \u0161tandardn\u00e9). Zdroje k\u00f3du re2c s\u00fa \u00faplne osloboden\u00e9 od detailov konkr\u00e9tneho jazyka a s\u00fa zalo\u017een\u00e9 len na syntaktickom s\u00fabore. Pou\u017e\u00edvate\u013e m\u00f4\u017ee \u010diasto\u010dne predefinova\u0165 existuj\u00faci syntaktick\u00fd s\u00fabor alebo nap\u00edsa\u0165 nov\u00fd od nuly. Pre v\u0161etky ofici\u00e1lne podporovan\u00e9 jazyky s\u00fa \u00fapln\u00e1 dokument\u00e1cia s pr\u00edkladmi<\/a>.<\/p>\n

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

Mimochodom, samotn\u00e1 my\u0161lienka syntaktick\u00fdch s\u00faborov vznikla v\u010faka jedn\u00e9mu koment\u00e1ru na LOR-e<\/a>, za \u010do \u010fakujeme \"re2cthe_coder<\/a>.<\/p>\n

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

Do release bolo zahrnut\u00fdch mnoho \u010fal\u0161\u00edch zmien na zjednodu\u0161enie pou\u017e\u00edvate\u013esk\u00e9ho rozhrania, vylep\u0161en\u00ed pr\u00e1ce so zachyt\u00e1vac\u00edmi skupinami (capturing groups), ako aj bola pridan\u00e1 online prostredie na \u00fapravu a kompil\u00e1ciu pr\u00edkladov: http:\/\/re2c.org\/playground<\/a>.<\/p>\n

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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 utorok, 19. novembra, bol predstaven\u00fd release re2c \u2013 gener\u00e1tor lexik\u00e1lnych analyz\u00e1torov (teda kompil\u00e1tor 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