{"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\/no\/blog\/news\/re2c-4-0","title":{"rendered":"re2c 4.0","gt_translate_keys":[{"key":"rendered","format":"text"}]},"content":{"rendered":"

<\/p>\n

Tirsdag, 19. november, ble utgivelsen presentert re2c<\/a> \u2013 generator av leksikalanalyzere (ogs\u00e5 kjent som kompilator for regul\u00e6re uttrykk til kode p\u00e5 m\u00e5lspr\u00e5ket). re2c spesialiserer seg p\u00e5 generering av raske og lett integrerte leksere. Den skiller seg fra det mer kjente alternativet flex ved \u00e5 ha et fleksibelt grensesnitt, generering av optimaliserte uoversiktlige leksere og st\u00f8tte for fangst (submatch extraction) basert p\u00e5 deterministiske endelige automater med etiketter (TDFA<\/a>). re2c brukes i prosjekter der hastigheten p\u00e5 leksikeren er viktig, for eksempel i Ninja og PHP.<\/p>\n

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

I versjon 4.0 ble kodegenereringssystemet fundamentalt omarbeidet, noe som muliggjorde st\u00f8tte for \u00e5tte nye spr\u00e5k (D, Haskell, Java, JavaScript, OCaml, Python, V, Zig) i tillegg til de allerede st\u00f8ttede (C\/C++, Go, Rust), samt en generell mekanisme for \u00e5 legge til nye spr\u00e5k via konfigurasjonsfiler. Kodegeneratoren er ansvarlig for \u00e5 oversette den allerede bygde og optimaliserte endelige automaten til kode, det vil si dens oppgave \u2013 \u00e5 velge passende kontrollstrukturer, datatyper, generell programmodell osv. for m\u00e5lspr\u00e5ket. Tidligere var all denne logikken en del av source-koden til re2c, og for \u00e5 endre den eller legge til et nytt spr\u00e5k m\u00e5tte man lappe source-koden og kompilere re2c p\u00e5 nytt. Slike lappeforslag ble ikke tatt inn i hovedrepoet uten implementering av et standard sett med eksempler og tester, noe som i tillegg kompliserte hele prosessen. N\u00e5 er all denne logikken flyttet til syntaksfiler<\/a> \u2013 tekstbaserte konfigurasjonsfiler, som kan leveres av brukeren (som standard bruker re2c de innebygde). Source-koden til re2c er helt fri for detaljer om spesifikke spr\u00e5k og er utelukkende avhengig av syntaksfilen. Brukeren kan delvis overstyre den eksisterende syntaksfilen eller skrive en ny fra bunnen av. For alle offisielt st\u00f8ttede spr\u00e5k er det full dokumentasjon med eksempler<\/a>.<\/p>\n

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

For \u00f8vrig ble selve ideen om syntaksfiler inspirert av en kommentar p\u00e5 LOR<\/a>, s\u00e5 takk til \"re2cthe_coder<\/a>.<\/p>\n

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

Utgivelsen inneholder mange andre endringer for \u00e5 forenkle brukergrensesnittet, forbedre arbeidet med fangende grupper (capturing groups), og det ble ogs\u00e5 lagt til et online-milj\u00f8 for redigering og kompilering av eksempler: http:\/\/re2c.org\/playground<\/a>.<\/p>\n

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

Kilde: 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":"Tirsdag 19. november ble re2c \u2013 en generator for leksikalske analyser (som ogs\u00e5 er en kompilator for regul\u00e6re uttrykk til kode p\u00e5 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