{"id":36759,"date":"2019-10-31T22:13:39","date_gmt":"2019-10-31T19:13:39","guid":{"rendered":"https:\/\/prohoster.info\/blog\/re2c-1-2\/"},"modified":"2019-10-31T22:13:39","modified_gmt":"2019-10-31T19:13:39","slug":"re2c-1-2","status":"publish","type":"post","link":"https:\/\/prohoster.info\/cs\/blog\/news\/re2c-1-2","title":{"rendered":"re2c 1.2","gt_translate_keys":[{"key":"rendered","format":"text"}]},"content":{"rendered":"<p>V p\u00e1tek 2. srpna vy\u0161el release re2c \u2014 voln\u00e9ho gener\u00e1toru lexik\u00e1ln\u00edch analyz\u00e1tor\u016f pro jazyky C a C++. P\u0159ipom\u00edn\u00e1me, \u017ee re2c byl naps\u00e1n v roce 1993 Peterem Bambulisem jako experiment\u00e1ln\u00ed gener\u00e1tor velmi rychl\u00fdch lexik\u00e1ln\u00edch analyz\u00e1tor\u016f, kter\u00fd se od jin\u00fdch gener\u00e1tor\u016f odli\u0161uje rychlost\u00ed generovan\u00e9ho k\u00f3du a neobvykle flexibiln\u00edm u\u017eivatelsk\u00fdm rozhran\u00edm, kter\u00e9 umo\u017e\u0148uje snadn\u00e9 a efektivn\u00ed integrovan\u00ed analyz\u00e1tor\u016f do st\u00e1vaj\u00edc\u00ed k\u00f3dov\u00e9 z\u00e1kladny. Od t\u00e9 doby projekt vyv\u00edj\u00ed komunita a st\u00e1le z\u016fst\u00e1v\u00e1 platformou pro experimenty a v\u00fdzkum v oblasti form\u00e1ln\u00edch gramatik a kone\u010dn\u00fdch automat\u016f.<\/p>\n<p>Hlavn\u00ed novinky ve verzi 1.2:<\/p>\n<ul>\n<li>\n<p>Byl p\u0159id\u00e1n nov\u00fd (zjednodu\u0161en\u00fd) zp\u016fsob kontroly na konec vstupn\u00edch dat<br \/>\n(angl. \u201eEOF rule\u201c).<br \/>\nK tomu byla p\u0159id\u00e1na konfigurace re2c:eof,<br \/>\nkter\u00e1 umo\u017e\u0148uje zvolit termin\u00e1ln\u00ed znak,<br \/>\na speci\u00e1ln\u00ed pravidlo $, kter\u00e9 se aktivuje, pokud lexer<br \/>\n\u00fasp\u011b\u0161n\u011b dos\u00e1hne konce vstupn\u00edch dat.<br \/>\nHistoricky re2c nab\u00edz\u00ed n\u011bkolik zp\u016fsob\u016f, jak zkontrolovat<br \/>\nkonec vstupn\u00edch dat, kter\u00e9 se li\u0161\u00ed podle omezen\u00ed, efektivity a jednoduchosti<br \/>\npou\u017eit\u00ed. Nov\u00fd zp\u016fsob m\u00e1 za c\u00edl zjednodu\u0161it psan\u00ed k\u00f3du, p\u0159i\u010dem\u017e<br \/>\nz\u016fst\u00e1v\u00e1 efektivn\u00ed a \u0161iroce pou\u017eiteln\u00fd. Star\u00e9 zp\u016fsoby<br \/>\nst\u00e1le funguj\u00ed a mohou b\u00fdt v n\u011bkter\u00fdch p\u0159\u00edpadech preferov\u00e1ny.<\/p>\n<\/li>\n<li>\n<p>Byla p\u0159id\u00e1na mo\u017enost zahrnut\u00ed extern\u00edch soubor\u016f pomoc\u00ed direktivy<br \/>\n\/*!include:re2c &quot;file.re&quot; *\/, \u0433\u0434\u0435 file.re<br \/>\nje to n\u00e1zev zahrnut\u00e9ho souboru. Re2c hled\u00e1 soubory ve slo\u017ece zahrnuj\u00edc\u00edho souboru,<br \/>\na tak\u00e9 v seznamu cest zadan\u00fdch pomoc\u00ed volby -I.<br \/>\nZahrnut\u00e9 soubory mohou zahrnovat dal\u0161\u00ed soubory.<br \/>\nRe2c poskytuje \u201estandardn\u00ed\u201c soubory v adres\u00e1\u0159i include\/<br \/>\nprojektu \u2014 p\u0159edpokl\u00e1d\u00e1 se, \u017ee tam budou shroma\u017e\u010fov\u00e1ny u\u017eite\u010dn\u00e9 definice<br \/>\nregul\u00e1rn\u00edch v\u00fdraz\u016f, n\u011bco na zp\u016fsob standardn\u00ed knihovny.<br \/>\nZat\u00edm byla na z\u00e1klad\u011b \u017e\u00e1dost\u00ed p\u0159id\u00e1na jedna soubor s definicemi kategori\u00ed Unicode.<\/p>\n<\/li>\n<li>\n<p>Byla p\u0159id\u00e1na mo\u017enost generovat hlavi\u010dkov\u00e9 soubory s libovoln\u00fdm<br \/>\ns obsahem pomoc\u00ed voleb -t \u2014type-header (nebo odpov\u00eddaj\u00edc\u00edch<br \/>\nkonfigurac\u00ed) a nov\u00fdch direktiv \n\/*!header:re2c:on*\/ a<br \/>\n\/*!header:re2c:off*\/. \u042d\u0442\u043e \u043c\u043e\u0436\u0435\u0442 \u0431\u044b\u0442\u044c \u043f\u043e\u043b\u0435\u0437\u043d\u043e \u0432 \u0441\u043b\u0443\u0447\u0430\u044f\u0445,<br \/>\nkdy\u017e re2c m\u00e1 generovat definice prom\u011bnn\u00fdch, struktur a makro,<br \/>\nkter\u00e9 se pou\u017e\u00edvaj\u00ed v jin\u00fdch p\u0159eklada\u010d\u00edch.<\/p>\n<\/li>\n<li>\n<p>Re2c nyn\u00ed rozum\u00ed UTF8 liter\u00e1l\u016fm a t\u0159\u00edd\u00e1m znak\u016f v regul\u00e1rn\u00edch v\u00fdrazech.<br \/>\nVe v\u00fdchoz\u00edm nastaven\u00ed re2c parsuje v\u00fdrazy jako \"\u2200x \u2203y\" jako.<br \/>\nsekvenci 1bitov\u00fdch ASCII znak\u016f e2 88 80 78 20 e2 88 83 79<br \/>\n(hex-k\u00f3dy), a u\u017eivatel\u00e9 mus\u00ed ru\u010dn\u011b escapovat Unicode znaky:<br \/>\n\"u2200x u2203y\". To je velmi nepohodln\u00e9 a neo\u010dek\u00e1van\u00e9 pro mnoh\u00e9<br \/>\nco\u017e dokazuj\u00ed neust\u00e1l\u00e9 reporty chyb. Proto nyn\u00ed<br \/>\nre2c nab\u00edz\u00ed mo\u017enost \u2014input-encoding ,<br \/>\nkter\u00e1 umo\u017e\u0148uje zm\u011bnit chov\u00e1n\u00ed a parsovat \"\u2200x \u2203y\" jako<br \/>\n2200 78 20 2203 79.<\/p>\n<\/li>\n<li>\n<p>Re2c nyn\u00ed umo\u017e\u0148uje pou\u017e\u00edvat b\u011b\u017en\u00e9 re2c-bloky v re\u017eimu -r \u2014reuse.<br \/>\nTo je u\u017eite\u010dn\u00e9, pokud vstupn\u00ed soubor obsahuje mnoho blok\u016f a pouze \u010d\u00e1st z nich<br \/>\npot\u0159ebuje op\u011btovn\u00e9 pou\u017eit\u00ed.<\/p>\n<\/li>\n<li>\n<p>Byla p\u0159id\u00e1na mo\u017enost nastavovat form\u00e1t varov\u00e1n\u00ed a chybov\u00fdch zpr\u00e1v<br \/>\npomoc\u00ed nov\u00e9 volby \u2014location-format . GNU form\u00e1t je zobrazen<br \/>\njako filename:line:column:, a MSVC form\u00e1t \u2014 jako filename(line,column).<br \/>\nTato funkce se m\u016f\u017ee hodit milovn\u00edk\u016fm IDE.<br \/>\nTak\u00e9 byla p\u0159id\u00e1na volba \u2014verbose, kter\u00e1 vypisuje kr\u00e1tk\u00e9 v\u00edt\u011bzn\u00e9 zpr\u00e1vy v p\u0159\u00edpad\u011b \u00fasp\u011bchu.<\/p>\n<\/li>\n<li>\n<p>Byl vylep\u0161en re\u017eim \u201ekompatibility\u201c s flex \u2014 opraveny n\u011bkter\u00e9 chyby parsov\u00e1n\u00ed a<br \/>\nnespr\u00e1vn\u00e1 priorita operator\u016f v ojedin\u011bl\u00fdch p\u0159\u00edpadech.<br \/>\nHistoricky volba -F \u2014flex-support umo\u017e\u0148uje ps\u00e1t k\u00f3d<br \/>\nsm\u00ed\u0161en\u011b ve stylu flex a ve stylu re2c, co\u017e pon\u011bkud komplikuje syntaktickou anal\u00fdzu.<br \/>\nRe\u017eim kompatibility s flex se vz\u00e1cn\u011b pou\u017e\u00edv\u00e1 v nov\u00e9m k\u00f3du,<br \/>\nale re2c jej i nad\u00e1le podporuje pro zp\u011btnou kompatibilitu.<\/p>\n<\/li>\n<li>\n<p>Oper\u00e1tor od\u010d\u00edt\u00e1n\u00ed znakov\u00fdch t\u0159\u00edd \/ nyn\u00ed plat\u00ed<br \/>\np\u0159ed rozbalen\u00edm k\u00f3dov\u00e1n\u00ed, co\u017e umo\u017e\u0148uje jeho pou\u017eit\u00ed ve v\u011bt\u0161\u00edm po\u010dtu p\u0159\u00edpad\u016f,<br \/>\npokud se pou\u017e\u00edv\u00e1 k\u00f3dov\u00e1n\u00ed s prom\u011bnlivou d\u00e9lkou znaku (nap\u0159\u00edklad UTF8).<\/p>\n<\/li>\n<li>\n<p>V\u00fdstupn\u00ed soubor je nyn\u00ed vytv\u00e1\u0159en atom\u00e1rn\u011b: re2c nejprve vytvo\u0159\u00ed do\u010dasn\u00fd soubor<br \/>\na zap\u00ed\u0161e do n\u011bj v\u00fdsledek, a pot\u00e9 p\u0159ejmenuje do\u010dasn\u00fd soubor na v\u00fdstupn\u00ed<br \/>\nv jedn\u00e9 operaci.<\/p>\n<\/li>\n<li>\n<p>Dokumentace byla dopln\u011bna a p\u0159epracov\u00e1na; zejm\u00e9na byly p\u0159id\u00e1ny nov\u00e9<br \/>\n<noindex>kapitoly <a rel=\"nofollow\" href=\"http:\/\/re2c.org\/manual\/manual.html#buffer-refilling\">o vypl\u0148ov\u00e1n\u00ed bufferu<\/a><\/noindex><br \/>\na <a rel=\"nofollow\" href=\"http:\/\/re2c.org\/manual\/manual.html#eof-handling\">o zp\u016fsobech kontroly konce vstupn\u00edch dat<\/a>.<br \/>\nNov\u00e1 dokumentace byla shrom\u00e1\u017ed\u011bna jako<br \/>\n<a rel=\"nofollow\" href=\"http:\/\/re2c.org\/manual\/manual.html\">vy\u010derp\u00e1vaj\u00edc\u00ed jednopageov\u00fd manu\u00e1l<\/a><br \/>\ns p\u0159\u00edklady (ty stejn\u00e9 zdrojov\u00e9 materi\u00e1ly jsou vykreslov\u00e1ny v manpage a v online dokumentaci).<br \/>\nByly u\u010din\u011bny slab\u00e9 pokusy o zlep\u0161en\u00ed \u010ditelnosti webu na telefonech.<\/p>\n<\/li>\n<li>\n<p>Z pohledu v\u00fdvoj\u00e1\u0159\u016f re2c z\u00edskal plnohodnotn\u011bj\u0161\u00ed subsyst\u00e9m.<br \/>\nlad\u011bn\u00ed. Ladic\u00ed k\u00f3d je nyn\u00ed v uvoln\u011bn\u00fdch sestaven\u00edch vypnut\u00fd a<br \/>\nm\u016f\u017ee b\u00fdt aktivov\u00e1na pomoc\u00ed konfigura\u010dn\u00ed volby \u2014enable-debug.<\/p>\n<\/li>\n<\/ul>\n<p>Tento release trval dlouhou dobu \u2014 t\u00e9m\u011b\u0159 cel\u00fd rok.<br \/>\nV\u011bt\u0161ina \u010dasu, jako v\u017edy, byla v\u011bnov\u00e1na v\u00fdvoji teoretick\u00e9ho z\u00e1kladu a psan\u00ed<br \/>\nna str\u00e1nk\u00e1ch Maven Apache Project <a rel=\"nofollow\" href=\"http:\/\/re2c.org\/2019_borsotti_trofimovich_efficient_posix_submatch_extraction_on_nfa.pdf\">\u201eEfficient POSIX Submatch Extraction on NFA\u201c<\/a>.<br \/>\nAlgoritmy popsan\u00e9 v \u010dl\u00e1nku jsou implementov\u00e1ny v experiment\u00e1ln\u00ed knihovn\u011b libre2c<br \/>\n(sestaven\u00ed knihovny a benchmark\u016f je ve v\u00fdchoz\u00edm nastaven\u00ed vypnuto a m\u016f\u017ee b\u00fdt zapnuto pomoc\u00ed konfigura\u010dn\u00ed mo\u017enosti<br \/>\n\u2014enable-libs). Knihovna nen\u00ed navr\u017eena jako konkurent ji\u017e existuj\u00edc\u00edm<br \/>\nprojekt\u016fm jako RE2, ale jako v\u00fdzkumn\u00e1 platforma pro v\u00fdvoj nov\u00fdch<br \/>\nalgoritm\u016f (kter\u00e9 mohou b\u00fdt pozd\u011bji pou\u017eity v re2c nebo v jin\u00fdch projektech).<br \/>\nTak\u00e9 je to u\u017eite\u010dn\u00e9 z hlediska testov\u00e1n\u00ed, benchmarkingu a vytv\u00e1\u0159en\u00ed vazeb na jin\u00e9 jazyky.<\/p>\n<p>D\u011bkujeme od v\u00fdvoj\u00e1\u0159\u016f re2c v\u0161em, kte\u0159\u00ed pomohli k tomu, aby tato verze vznikla,<br \/>\na cel\u00e9mu komunitn\u00edmu prost\u0159ed\u00ed za n\u00e1pady, reporty chyb, patche, bojov\u00e9ho ducha atd. ;]<\/p>\n<p>Zdroj: <a \ncontent=\"nofollow\" rel=\"nofollow\" href=\"http:\/\/www.linux.org.ru\/news\/development\/15144630\">linux.org.ru<\/a><\/p>","protected":false,"gt_translate_keys":[{"key":"rendered","format":"html"}]},"excerpt":{"rendered":"<p>\u0412 \u043f\u044f\u0442\u043d\u0438\u0446\u0443 2-\u0433\u043e \u0430\u0432\u0433\u0443\u0441\u0442\u0430 \u0432\u044b\u0448\u0435\u043b \u0440\u0435\u043b\u0438\u0437 re2c &mdash; \u0441\u0432\u043e\u0431\u043e\u0434\u043d\u043e\u0433\u043e \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 \u0434\u043b\u044f \u044f\u0437\u044b\u043a\u043e\u0432 C \u0438 C++. \u041d\u0430\u043f\u043e\u043c\u043d\u0438\u043c, \u0447\u0442\u043e re2c \u0431\u044b\u043b \u043d\u0430\u043f\u0438\u0441\u0430\u043d \u0432 1993 \u0433\u043e\u0434\u0443 \u041f\u0438\u0442\u0435\u0440\u043e\u043c \u0411\u0430\u043c\u0431\u0443\u043b\u0438\u0441\u043e\u043c \u043a\u0430\u043a \u044d\u043a\u0441\u043f\u0435\u0440\u0438\u043c\u0435\u043d\u0442\u0430\u043b\u044c\u043d\u044b\u0439 \u0433\u0435\u043d\u0435\u0440\u0430\u0442\u043e\u0440 \u043e\u0447\u0435\u043d\u044c \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, \u043e\u0442\u043b\u0438\u0447\u0430\u044e\u0449\u0438\u0439\u0441\u044f \u043e\u0442 \u0434\u0440\u0443\u0433\u0438\u0445 \u0433\u0435\u043d\u0435\u0440\u0430\u0442\u043e\u0440\u043e\u0432 \u0441\u043a\u043e\u0440\u043e\u0441\u0442\u044c\u044e \u0441\u0433\u0435\u043d\u0435\u0440\u0438\u0440\u043e\u0432\u0430\u043d\u043d\u043e\u0433\u043e \u043a\u043e\u0434\u0430 \u0438 \u043d\u0435\u043e\u0431\u044b\u0447\u043d\u043e \u0433\u0438\u0431\u043a\u0438\u043c \u043f\u043e\u043b\u044c\u0437\u043e\u0432\u0430\u0442\u0435\u043b\u044c\u0441\u043a\u0438\u043c \u0438\u043d\u0442\u0435\u0440\u0444\u0435\u0439\u0441\u043e\u043c, \u043a\u043e\u0442\u043e\u0440\u044b\u0439 \u043f\u043e\u0437\u0432\u043e\u043b\u044f\u0435\u0442 \u043b\u0435\u0433\u043a\u043e \u0438 \u044d\u0444\u0444\u0435\u043a\u0442\u0438\u0432\u043d\u043e \u0432\u0441\u0442\u0440\u0438\u0432\u0430\u0442\u044c \u0430\u043d\u0430\u043b\u0438\u0437\u0430\u0442\u043e\u0440\u044b \u0432 \u0441\u0443\u0449\u0435\u0441\u0442\u0432\u0443\u044e\u0449\u0443\u044e [&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-36759","post","type-post","status-publish","format-standard","hentry","category-news"],"aioseo_notices":[],"aioseo_head":"\n\t\t<!-- All in One SEO 5.0.3 - aioseo.com -->\n\t<meta name=\"description\" content=\"\u0412 \u043f\u044f\u0442\u043d\u0438\u0446\u0443 2-\u0433\u043e \u0430\u0432\u0433\u0443\u0441\u0442\u0430 \u0432\u044b\u0448\u0435\u043b \u0440\u0435\u043b\u0438\u0437 re2c \u2014 \u0441\u0432\u043e\u0431\u043e\u0434\u043d\u043e\u0433\u043e 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