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

<\/p>\n

Kedden, november 19-\u00e9n bemutat\u00e1sra ker\u00fclt re2c<\/a> – lexikai elemz\u0151k gener\u00e1tor\u00e1nak (m\u00e1s n\u00e9ven regul\u00e1ris kifejez\u00e9sek ford\u00edt\u00f3ja a c\u00e9lnyelven). A re2c gyors \u00e9s k\u00f6nnyen be\u00e9p\u00edthet\u0151 lexerek gener\u00e1l\u00e1s\u00e1ra specializ\u00e1l\u00f3dott. K\u00fcl\u00f6nbs\u00e9get tesz a h\u00edresebb flex anal\u00f3gi\u00e1t\u00f3l a rugalmas interf\u00e9sz, az optimaliz\u00e1lt t\u00e1bl\u00e1zat n\u00e9lk\u00fcli lexerek gener\u00e1l\u00e1sa \u00e9s a c\u00edmk\u00e9zett v\u00e9ges automat\u00e1k alapj\u00e1n t\u00f6rt\u00e9n\u0151 al-illeszked\u00e9s (submatch extraction) t\u00e1mogat\u00e1s\u00e1val.TDFA<\/a>). Az re2c olyan projektekben haszn\u00e1latos, ahol fontos a lexer gyorsas\u00e1ga, p\u00e9ld\u00e1ul a Ninja-ban \u00e9s a PHP-ban.<\/p>\n

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A 4.0-s kiad\u00e1sban gy\u00f6keresen \u00e1talak\u00edtott\u00e1k a k\u00f3dgener\u00e1l\u00f3 alrendszert, amely lehet\u0151v\u00e9 tette nyolc \u00faj nyelv (D, Haskell, Java, JavaScript, OCaml, Python, V, Zig) t\u00e1mogat\u00e1s\u00e1nak hozz\u00e1ad\u00e1s\u00e1t, a m\u00e1r t\u00e1mogatottakkal (C\/C++, Go, Rust) egy\u00fctt, valamint egy \u00e1ltal\u00e1nos mechanizmust az \u00faj nyelvek konfigur\u00e1ci\u00f3s f\u00e1jlokon kereszt\u00fcli hozz\u00e1ad\u00e1s\u00e1hoz. A k\u00f3dgener\u00e1tor felel\u0151s az elk\u00e9sz\u00edtett \u00e9s optimaliz\u00e1lt v\u00e9ges automata k\u00f3dra ford\u00edt\u00e1s\u00e1\u00e9rt, vagyis a feladata az, hogy v\u00e1lassza ki a c\u00e9lnyelvhez megfelel\u0151 vez\u00e9rl\u00e9si szerkezeteket, adatt\u00edpusokat, a program \u00e1ltal\u00e1nos modellj\u00e9t stb. Kor\u00e1bban ez a logika a re2c forr\u00e1sk\u00f3dj\u00e1nak r\u00e9sze volt, \u00e9s annak m\u00f3dos\u00edt\u00e1s\u00e1hoz vagy \u00faj nyelv hozz\u00e1ad\u00e1s\u00e1hoz a forr\u00e1sk\u00f3d jav\u00edt\u00e1s\u00e1ra \u00e9s a re2c \u00fajra\u00e9p\u00edt\u00e9s\u00e9re volt sz\u00fcks\u00e9g. Az ilyen jav\u00edt\u00e1sokat nem fogadt\u00e1k el a f\u0151 t\u00e1rol\u00f3ba an\u00e9lk\u00fcl, hogy a standard p\u00e9ld\u00e1k \u00e9s tesztek k\u00e9sz\u00fcltek volna, ami tov\u00e1bbi neh\u00e9zs\u00e9geket okozott az eg\u00e9sz folyamatban. Most ez a logika \u00e1thelyez\u0151d\u00f6tt szintaktikai f\u00e1jlokba<\/a> – sz\u00f6veges konfigur\u00e1ci\u00f3s f\u00e1jlokba, amelyeket a felhaszn\u00e1l\u00f3 adhat meg (alap\u00e9rtelmezetten a re2c a szabv\u00e1nyos konfigur\u00e1ci\u00f3kat haszn\u00e1lja). A re2c forr\u00e1sk\u00f3dja teljesen mentes a konkr\u00e9t nyelv r\u00e9szleteit\u0151l, \u00e9s kiz\u00e1r\u00f3lag a szintaktikai f\u00e1jlra t\u00e1maszkodik. A felhaszn\u00e1l\u00f3 r\u00e9szben fel\u00fcl\u00edrhatja a megl\u00e9v\u0151 szintaktikai f\u00e1jlt, vagy null\u00e1r\u00f3l \u00edrhat egy \u00fajat. Minden hivatalosan t\u00e1mogatott nyelvhez l\u00e9tezik teljes dokument\u00e1ci\u00f3 \u00e1ll rendelkez\u00e9sre p\u00e9ld\u00e1kkal<\/a>.<\/p>\n

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

Egy\u00e9bk\u00e9nt mag\u00e1nak a szintaktikai f\u00e1jlok \u00f6tlete k\u00f6sz\u00f6nhet\u0151 egy megjegyz\u00e9snek a LOR-on<\/a>, ami\u00e9rt k\u00f6sz\u00f6net \"re2cthe_coder<\/a>.<\/p>\n

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

A kiad\u00e1s sz\u00e1mos egy\u00e9b v\u00e1ltoz\u00e1st is tartalmazott a felhaszn\u00e1l\u00f3i fel\u00fclet egyszer\u0171s\u00edt\u00e9s\u00e9re, a r\u00f6gz\u00edt\u0151 csoportokkal val\u00f3 munka jav\u00edt\u00e1s\u00e1ra, valamint hozz\u00e1adtak egy online k\u00f6rnyezetet a p\u00e9ld\u00e1k szerkeszt\u00e9s\u00e9hez \u00e9s ford\u00edt\u00e1s\u00e1hoz: http:\/\/re2c.org\/playground<\/a>.<\/p>\n

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

Forr\u00e1s: 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":"November 19, kedd\u00e9n bemutat\u00e1sra ker\u00fclt a re2c \u2013 a lexikai elemz\u0151k gener\u00e1tora (azaz egy regul\u00e1ris kifejez\u00e9sek 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