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

<\/p>\n

Tirsdag den 19. november blev der pr\u00e6senteret en udgivelse re2c<\/a> \u2013 generator af leksikalske analysatorer (som ogs\u00e5 er en compiler af regul\u00e6re udtryk til kode i det valgte programmeringssprog). re2c specialiserer sig i at generere hurtige og let integrerbare leksere. Det adskiller sig fra den mere kendte pendant flex ved at have et fleksibelt interface, generering af optimerede ikke-tabel-baserede leksere og underst\u00f8ttelse af submatch extraction baseret p\u00e5 deterministiske endelige automater med tags (TDFA<\/a>). re2c bruges i projekter, hvor hastighed p\u00e5 leksere er vigtig, som f.eks. i Ninja og PHP.<\/p>\n

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

I version 4.0 blev kodegenereringssystemet gennemgribende redesignet, hvilket gjorde det muligt at tilf\u00f8je st\u00f8tte til otte nye sprog (D, Haskell, Java, JavaScript, OCaml, Python, V, Zig) ud over de allerede underst\u00f8ttede (C\/C++, Go, Rust), samt en generel mekanisme til at tilf\u00f8je nye sprog via konfigurationsfiler. Kodegeneratoren er ansvarlig for at overs\u00e6tte den allerede opbyggede og optimerede endelige automat til kode, dvs. dens opgave er at v\u00e6lge passende kontrolstrukturer, datatyper, den overordnede programmodel osv. for det valgte sprog. Tidligere var al denne logik en del af kildekoden til re2c, og for at \u00e6ndre den eller tilf\u00f8je et nyt sprog var man n\u00f8dt til at patch'e kildekoden og genkompilere re2c. S\u00e5danne patches blev ikke accepteret i det prim\u00e6re repository uden implementering af en standard s\u00e6t eksempler og tests, hvilket yderligere komplicerede hele processen. Nu er al denne logik flyttet til syntaksfiler<\/a> \u2013 tekstbaserede konfigurationsfiler, som brugeren kan levere (som standard bruger re2c de standardfiler). Kildekoden til re2c er fuldst\u00e6ndig fri for detaljer om det specifikke sprog og er kun afh\u00e6ngig af den syntaktiske fil. Brugeren kan delvist overstyre en eksisterende syntaktisk fil eller skrive en ny fra bunden. For alle officielt underst\u00f8ttede sprog er der fuld dokumentation med eksempler<\/a>.<\/p>\n

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

For \u00f8vrigt blev ideen om syntaksfiler inspireret af en kommentar p\u00e5 LOR<\/a>, mange tak til \"re2cthe_coder<\/a>.<\/p>\n

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

Udgivelsen indeholder mange andre \u00e6ndringer til forenkling af brugergr\u00e6nsefladen, forbedring af arbejdet med fangstgrupper (capturing groups), og der er ogs\u00e5 tilf\u00f8jet et online milj\u00f8 til redigering og kompilering af 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 den 19. november blev re2c - 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