{"id":89487,"date":"2020-07-23T01:42:30","date_gmt":"2020-07-22T23:42:30","guid":{"rendered":"https:\/\/prohoster.info\/blog\/novosti-interneta\/re2c-2-0"},"modified":"2020-07-23T01:42:30","modified_gmt":"2020-07-22T23:42:30","slug":"re2c-2-0","status":"publish","type":"post","link":"https:\/\/prohoster.info\/sk\/blog\/news\/re2c-2-0","title":{"rendered":"re2c 2.0","gt_translate_keys":[{"key":"rendered","format":"text"}]},"content":{"rendered":"<p>V pondelok 20. j\u00fala bol vydan\u00fd re2c \u2013 gener\u00e1tor r\u00fdchlych lexik\u00e1lnych analyz\u00e1torov.<br \/>\nHlavn\u00e9 zmeny:<\/p>\n<ul>\n<li>\n<p>Pridan\u00e1 podpora jazyka Go<br \/>\n(je zahrnut\u00e9 bu\u010f ako vo\u013eba \u2014lang go pre re2c, alebo ako samostatn\u00fd program re2go).<br \/>\nDokument\u00e1cia pre C a Go sa generuje z toho ist\u00e9ho textu, ale s r\u00f4znymi<br \/>\npr\u00edkladmi k\u00f3du. \u00daplne bola prepracovan\u00e1 pods\u00fastava generovania k\u00f3du v re2c, \u010do<br \/>\nby malo zjednodu\u0161i\u0165 podporu nov\u00fdch jazykov v bud\u00facnosti.<\/p>\n<\/li>\n<li>\n<noindex><\/p>\n<p>Pridan\u00fd alternat\u00edvny syst\u00e9m zostavovania na CMake (\u010fakujeme <a rel=\"nofollow\" href=\"https:\/\/github.com\/ligfx\">ligfx<\/a>!).<\/noindex><br \/>\nPokusy o prevod re2c na CMake sa robili u\u017e d\u00e1vno, ale pred ligfx nikto<br \/>\nnepon\u00fakol komplexn\u00e9 rie\u0161enie.<br \/>\nStar\u00fd syst\u00e9m zostavovania na Autotools na\u010falej podporuje a pou\u017e\u00edva,<br \/>\na v bl\u00edzkej bud\u00facnosti nie s\u00fa pl\u00e1ny na jeho opustenie (\u010diasto\u010dne aby sa nevytv\u00e1rali<br \/>\nprobl\u00e9my v\u00fdvoj\u00e1rom distrib\u00faci\u00ed, \u010diasto\u010dne preto, lebo star\u00fd syst\u00e9m zostavovania<br \/>\nje stabilnej\u0161\u00ed a preh\u013eadnej\u0161\u00ed ne\u017e nov\u00fd).<br \/>\nObe syst\u00e9my s\u00fa rovnocenne neust\u00e1le testovan\u00e9 pomocou Travis CI.<\/p>\n<\/li>\n<li>\n<p>Pridan\u00e1 mo\u017enos\u0165 zada\u0165 rozhranie k\u00f3du v konfigur\u00e1ci\u00e1ch pri pou\u017eit\u00ed<br \/>\ngenerick\u00e9ho API (generic API). Predt\u00fdm sa v\u00e4\u010d\u0161ina API musela zad\u00e1va\u0165 v podobe<br \/>\nfunkci\u00ed alebo funkcion\u00e1lnych makier. Teraz ich mo\u017eno zad\u00e1va\u0165 v podobe \u013eubovo\u013en\u00fdch<br \/>\nre\u0165azcov s pomenovan\u00fdmi \u0161abl\u00f3nov\u00fdmi parametrami vo forme @@{name} alebo len @@ (ak<br \/>\nparametrom je jeden a nevznik\u00e1 nejednozna\u010dnos\u0165). \u0160t\u00fdl API sa ur\u010duje konfigur\u00e1ciou<br \/>\nre2c:api:style (hodnota functions ur\u010duje funk\u010dn\u00fd \u0161t\u00fdl, zatia\u013e \u010do free-form je vo\u013en\u00fd).<\/p>\n<\/li>\n<li>\n<p>Vylep\u0161en\u00e1 funkcia vo\u013eby -c, \u2014start-conditions, ktor\u00e1 umo\u017e\u0148uje kombinova\u0165 viacero<br \/>\nvz\u00e1jomne prepojen\u00fdch lex\u00e9rov v jednom re2c-bloku. Teraz je mo\u017en\u00e9 pou\u017e\u00edva\u0165<br \/>\nbe\u017en\u00e9 bloky na rovnakej \u00farovni ako podmienkov\u00e9 a zad\u00e1va\u0165 nieko\u013eko nes\u00favisiacich podmienkov\u00fdch<br \/>\nblokov v jednom s\u00fabore.<br \/>\nVylep\u0161en\u00e1 funkcia vo\u013eby -r, \u2014reuse (op\u00e4tovn\u00e9 pou\u017eitie k\u00f3du z jedn\u00e9ho bloku<br \/>\nv in\u00fdch blokoch) v kombin\u00e1cii s vo\u013ebami -c, \u2014start-conditions a -f, \u2014storable-state.<br \/>\n(lex\u00e9r so zachov\u00e1van\u00fdm stavom, ktor\u00fd mo\u017eno preru\u0161i\u0165 v \u013eubovo\u013enom mieste<br \/>\na pokra\u010dova\u0165 v \u0148om nesk\u00f4r).<\/p>\n<\/li>\n<li>\n<p>Opraven\u00e1 chyba v ned\u00e1vno pridanom algoritmoch spracovania konca vstupn\u00fdch d\u00e1t<br \/>\n(EOF rule), ktor\u00e1 v zriedkav\u00fdch pr\u00edpadoch viedla k nespr\u00e1vnemu spracovaniu<br \/>\nprekryt\u00fdch pravidiel.<\/p>\n<\/li>\n<li>\n<p>Zjednodu\u0161en\u00fd proces bootstrappingu. Predt\u00fdm sa syst\u00e9m zostavovania sna\u017eil dynamicky n\u00e1js\u0165 u\u017e<br \/>\ns\u00fa\u010dasne zostaven\u00fd re2c, ktor\u00fd by mohol by\u0165 pou\u017eit\u00fd pre prebuildovanie seba sam\u00e9ho.<br \/>\nTo malo za n\u00e1sledok nespr\u00e1vne z\u00e1vislosti (preto\u017ee graf z\u00e1vislost\u00ed bol<br \/>\ndynamick\u00fd, \u010do v\u00e4\u010d\u0161ina syst\u00e9mov na zostavenie nem\u00e1 rada).<br \/>\nTeraz je potrebn\u00e9 explicitne nakonfigurova\u0165 syst\u00e9m zostavenia a nastavi\u0165 premenn\u00fa RE2C_FOR_BUILD na prebudovanie lexerov.<br \/>\n\u010eakujem v\u0161etk\u00fdm, ktor\u00ed sa podie\u013eali na pr\u00edprave tohto vydania!<\/p>\n<\/li>\n<\/ul>\n<p>\ud83e\udd47re2c 2.0 | ProHoster<\/p>\n<p>Zdroj: <a \ncontent=\"nofollow\" rel=\"nofollow\" href=\"http:\/\/www.linux.org.ru\/news\/development\/15820642\">linux.org.ru<\/a><\/p>","protected":false,"gt_translate_keys":[{"key":"rendered","format":"html"}]},"excerpt":{"rendered":"<p>\u0412 \u043f\u043e\u043d\u0435\u0434\u0435\u043b\u044c\u043d\u0438\u043a 20 \u0438\u044e\u043b\u044f \u0432\u044b\u0448\u0435\u043b \u0440\u0435\u043b\u0438\u0437 re2c &ndash; \u0433\u0435\u043d\u0435\u0440\u0430\u0442\u043e\u0440\u0430 \u0431\u044b\u0441\u0442\u0440\u044b\u0445 \u043b\u0435\u043a\u0441\u0438\u0447\u0435\u0441\u043a\u0438\u0445 \u0430\u043d\u0430\u043b\u0438\u0437\u0430\u0442\u043e\u0440\u043e\u0432. \u041e\u0441\u043d\u043e\u0432\u043d\u044b\u0435 \u0438\u0437\u043c\u0435\u043d\u0435\u043d\u0438\u044f: \u0414\u043e\u0431\u0430\u0432\u043b\u0435\u043d\u0430 \u043f\u043e\u0434\u0434\u0435\u0440\u0436\u043a\u0430 \u044f\u0437\u044b\u043a\u0430 Go (\u0432\u043a\u043b\u044e\u0447\u0430\u0435\u0442\u0441\u044f \u0438\u043b\u0438 \u043e\u043f\u0446\u0438\u0435\u0439 &#8212;lang go \u0434\u043b\u044f re2c, \u0438\u043b\u0438 \u0432 \u0432\u0438\u0434\u0435 \u043e\u0442\u0434\u0435\u043b\u044c\u043d\u043e\u0439 \u043f\u0440\u043e\u0433\u0440\u0430\u043c\u043c\u044b re2go). \u0414\u043e\u043a\u0443\u043c\u0435\u043d\u0442\u0430\u0446\u0438\u044f \u0434\u043b\u044f C \u0438 Go \u0433\u0435\u043d\u0435\u0440\u0438\u0440\u0443\u0435\u0442\u0441\u044f \u0438\u0437 \u043e\u0434\u043d\u043e\u0433\u043e \u0438 \u0442\u043e\u0433\u043e \u0436\u0435 \u0442\u0435\u043a\u0441\u0442\u0430, \u043d\u043e \u0441 \u0440\u0430\u0437\u043d\u044b\u043c\u0438 \u043f\u0440\u0438\u043c\u0435\u0440\u0430\u043c\u0438 \u043a\u043e\u0434\u0430. \u041f\u043e\u043b\u043d\u043e\u0441\u0442\u044c\u044e \u043f\u0435\u0440\u0435\u0440\u0430\u0431\u043e\u0442\u0430\u043d\u0430 \u043f\u043e\u0434\u0441\u0438\u0441\u0442\u0435\u043c\u0430 \u043a\u043e\u0434\u043e\u0433\u0435\u043d\u0435\u0440\u0430\u0446\u0438\u0438 \u0432 re2c, \u0447\u0442\u043e [&hellip;]<\/p>\n","protected":false,"gt_translate_keys":[{"key":"rendered","format":"html"}]},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[702],"tags":[],"class_list":["post-89487","post","type-post","status-publish","format-standard","hentry","category-news"],"aioseo_notices":[],"aioseo_head":"\n\t\t<!-- All in One SEO 5.0.5 - aioseo.com -->\n\t<meta name=\"description\" content=\"\u0412 \u043f\u043e\u043d\u0435\u0434\u0435\u043b\u044c\u043d\u0438\u043a 20 \u0438\u044e\u043b\u044f \u0432\u044b\u0448\u0435\u043b \u0440\u0435\u043b\u0438\u0437 re2c \u2013 \u0433\u0435\u043d\u0435\u0440\u0430\u0442\u043e\u0440\u0430 \u0431\u044b\u0441\u0442\u0440\u044b\u0445 \u043b\u0435\u043a\u0441\u0438\u0447\u0435\u0441\u043a\u0438\u0445 \u0430\u043d\u0430\u043b\u0438\u0437\u0430\u0442\u043e\u0440\u043e\u0432.\" \/>\n\t<meta name=\"robots\" content=\"max-image-preview:large\" 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