{"id":36745,"date":"2019-10-31T22:13:31","date_gmt":"2019-10-31T19:13:31","guid":{"rendered":"https:\/\/prohoster.info\/blog\/vypusk-generatora-leksicheskih-analizatorov-re2c-1-2\/"},"modified":"2019-10-31T22:13:31","modified_gmt":"2019-10-31T19:13:31","slug":"vypusk-generatora-leksicheskih-analizatorov-re2c-1-2","status":"publish","type":"post","link":"https:\/\/prohoster.info\/sk\/blog\/news\/vypusk-generatora-leksicheskih-analizatorov-re2c-1-2","title":{"rendered":"Vydanie gener\u00e1tora lexik\u00e1lnych analyz\u00e1torov re2c 1.2","gt_translate_keys":[{"key":"rendered","format":"text"}]},"content":{"rendered":"<p><noindex><a rel=\"nofollow\" href=\"http:\/\/re2c.org\/releases\/release_notes.html\">Sa uskuto\u010dnilo<\/a><\/noindex> uvo\u013enenie <noindex><a rel=\"nofollow\" href=\"http:\/\/re2c.org\/\">re2c<\/a><\/noindex>, slobodn\u00e9ho gener\u00e1tora lexik\u00e1lnych analyz\u00e1torov pre jazyky C a C++. Pripome\u0148me, \u017ee re2c bol nap\u00edsan\u00fd v roku 1993 Petrom Bambulisom ako experiment\u00e1lny gener\u00e1tor ve\u013emi r\u00fdchlych lexik\u00e1lnych analyz\u00e1torov, odli\u0161uj\u00faci sa od ostatn\u00fdch gener\u00e1torov r\u00fdchlos\u0165ou vygenerovan\u00e9ho k\u00f3du a nezvy\u010dajne flexibiln\u00fdm pou\u017e\u00edvate\u013esk\u00fdm rozhran\u00edm, ktor\u00e9 umo\u017e\u0148uje \u013eahko a efekt\u00edvne integrova\u0165 analyz\u00e1tory do existuj\u00facej k\u00f3dovej z\u00e1kladne. Odvtedy projekt pokra\u010duje vo v\u00fdvoji prostredn\u00edctvom komunity a na\u010falej zost\u00e1va miestom pre experimenty a v\u00fdskum v oblasti form\u00e1lnych gramat\u00edk a kone\u010dn\u00fdch automatov.<\/p>\n<p>Pr\u00edprava vydania trvala takmer cel\u00fd rok. V\u00e4\u010d\u0161ina \u010dasu, ako v\u017edy, bola vynalo\u017een\u00e1 na v\u00fdvoj teoretick\u00e9ho z\u00e1kladu a p\u00edsanie<br \/>\n\u010dl\u00e1nky &#171;<noindex><a rel=\"nofollow\" href=\"http:\/\/re2c.org\/2019_borsotti_trofimovich_efficient_posix_submatch_extraction_on_nfa.pdf\">Efficient POSIX Submatch Extraction on NFA<\/a><\/noindex>&#171;.<br \/>\nAlgoritmy op\u00edsan\u00e9 v \u010dl\u00e1nku s\u00fa implementovan\u00e9 v experiment\u00e1lnej kni\u017enici libre2c<br \/>\n(kompil\u00e1cia kni\u017enice a testov v\u00fdkonu je predvolene vypnut\u00e1 a zap\u00edna sa pomocou konfigura\u010dnej mo\u017enosti &#171;&#8212;enable-libs&#187;). Kni\u017enica nie je zam\u00fd\u0161\u013ean\u00e1 ako konkurencia existuj\u00facim projektom, ako je RE2, ale ako v\u00fdskumn\u00e1 platforma na v\u00fdvoj nov\u00fdch<br \/>\nalgoritmov (ktor\u00e9 sa potom m\u00f4\u017eu pou\u017e\u00edva\u0165 v re2c alebo v in\u00fdch projektoch). Tie\u017e je to praktick\u00e9 z h\u013eadiska testovania, merania v\u00fdkonu a vytv\u00e1rania v\u00e4zieb na in\u00e9 jazyky.<\/p>\n<p>Hlavn\u00e9 novinky vo verzii re2c 1.2:<\/p>\n<ul>\n<li class=\"l\"> Bol pridan\u00fd nov\u00fd zjednodu\u0161en\u00fd sp\u00f4sob kontroly konca vstupn\u00fdch \u00fadajov (&#171;EOF rule&#187;). Na tento \u00fa\u010del bola pridan\u00e1 konfigur\u00e1cia &#171;re2c:eof&#187;,<br \/>\n   umo\u017e\u0148uj\u00faca vybra\u0165 termin\u00e1lny symbol,<br \/>\n   a \u0161peci\u00e1lne pravidlo &#171;$&#187;, ktor\u00e9 sa aktivuje, ak lexer<br \/>\n   \u00faspe\u0161ne dosiahol koniec vstupn\u00fdch \u00fadajov.<br \/>\n   Historicky re2c poskytuje na v\u00fdber nieko\u013eko sp\u00f4sobov kontroly na<br \/>\n   koniec vstupn\u00fdch \u00fadajov, l\u00ed\u0161iacich sa obmedzenos\u0165ou, efekt\u00edvnos\u0165ou a jednoduchos\u0165ou<br \/>\n   uplatnenia. Nov\u00fd sp\u00f4sob m\u00e1 za cie\u013e zjednodu\u0161i\u0165 p\u00edsanie k\u00f3du, pri\u010dom<br \/>\n   zost\u00e1va efekt\u00edvny a \u0161iroko pou\u017eite\u013en\u00fd. Star\u00e9 sp\u00f4soby<br \/>\n   na\u010falej funguj\u00fa a m\u00f4\u017eu by\u0165 preferovan\u00e9 v ur\u010dit\u00fdch pr\u00edpadoch.<\/p>\n<li class=\"l\"> Pridan\u00e1 mo\u017enos\u0165 zahrnutia extern\u00fdch s\u00faborov pomocou direkt\u00edvy<br \/>\n   &#171;\n\/*!include:re2c &#171;file.re&#187; *\n&#187;, kde &#171;file.re&#187; &#8212; je n\u00e1zov zahrnut\u00e9ho s\u00faboru. Re2c h\u013ead\u00e1 s\u00fabory v adres\u00e1ri zahrnut\u00e9ho s\u00faboru,<br \/>\n   ako aj v zozname ciest zadan\u00fdch pomocou vo\u013eby &#171;-I&#187;.<br \/>\n   Zahrnut\u00e9 s\u00fabory m\u00f4\u017eu zahr\u0148ova\u0165 \u010fal\u0161ie s\u00fabory.<br \/>\n   Re2c poskytuje &#171;\u0161tandardn\u00e9&#187; s\u00fabory v adres\u00e1ri &#171;include\/&#187;<br \/>\n   projektu &#8212; predpoklad\u00e1 sa, \u017ee tam bud\u00fa zhroma\u017e\u010fova\u0165 u\u017eito\u010dn\u00e9 defin\u00edcie<br \/>\n   regul\u00e1rnych v\u00fdrazov, nie\u010do ako \u0161tandardn\u00e1 kni\u017enica.<br \/>\n   Doteraz bol na po\u017eiadanie pridan\u00fd s\u00fabor s defin\u00edciami kateg\u00f3ri\u00ed Unicode.<\/p>\n<li class=\"l\"> Pridan\u00e1 mo\u017enos\u0165 generova\u0165 hlavi\u010dkov\u00e9 s\u00fabory s \u013eubovo\u013en\u00fdm<br \/>\n   obsahom pomocou mo\u017enost\u00ed &#171;-t &#8212;type-header&#187; (alebo pr\u00edslu\u0161n\u00fdch<br \/>\n   konfigur\u00e1ci\u00ed) a nov\u00fdch direkt\u00edv &#171;\n\/*!header:re2c:on*\/&#187; a<br \/>\n   &#171;\n\/*!header:re2c:off*\/&#187;. To m\u00f4\u017ee by\u0165 u\u017eito\u010dn\u00e9 v pr\u00edpade,<br \/>\n   kedy re2c mus\u00ed vygenerova\u0165 defin\u00edcie premenn\u00fdch, \u0161trukt\u00far a makier,<br \/>\n   ktor\u00e9 sa pou\u017e\u00edvaj\u00fa v in\u00fdch prekladoch.<\/p>\n<li class=\"l\"> Re2c teraz rozumie UTF8-literalom a triedam znakov v regul\u00e1rnych v\u00fdrazoch.<br \/>\n   Predvolene re2c spracov\u00e1va v\u00fdrazy ako &#171;&#8704;x &#8707;y&#187; ako<br \/>\n   sekvenciu 1-bitov\u00fdch ASCII-symbolov &#171;e2 88 80 78 20 e2 88 83 79&#187;<br \/>\n   (hex-k\u00f3dy), a pou\u017e\u00edvate\u013eom sa mus\u00ed ru\u010dne escapova\u0165 Unicode znaky:<br \/>\n   &#171;&#092;&#092;u2200x &#092;&#092;u2203y&#187;. Je to ve\u013emi nepr\u00edjemn\u00e9 a neo\u010dak\u00e1van\u00e9 pre mnoh\u00fdch<br \/>\n   pou\u017e\u00edvate\u013eov (o \u010dom sved\u010dia st\u00e1le sa objavuj\u00face bug reporty). Preto teraz<br \/>\n   Re2c poskytuje mo\u017enos\u0165 &#171;&#8212;input-encoding {ascii | utf8}&#187;,<br \/>\n   ktor\u00e1 umo\u017e\u0148uje zmeni\u0165 spr\u00e1vanie a spracova\u0165 &#171;&#8704;x &#8707;y&#187; ako<br \/>\n   &#171;2200 78 20 2203 79&#187;.<\/p>\n<li class=\"l\"> Re2c teraz umo\u017e\u0148uje pou\u017e\u00edva\u0165 be\u017en\u00e9 re2c-bloky v re\u017eime &#171;-r &#8212;reuse&#187;.<br \/>\n   Je to pohodln\u00e9, ak vstupn\u00fd s\u00fabor obsahuje ve\u013ea blokov a len niektor\u00e9 z nich<br \/>\n   potrebuj\u00fa op\u00e4tovn\u00e9 pou\u017eitie.<\/p>\n<li class=\"l\"> Objavila sa mo\u017enos\u0165 nastavova\u0165 form\u00e1t varovan\u00ed a chybov\u00fdch hl\u00e1sen\u00ed<br \/>\n   s novou mo\u017enos\u0165ou &#171;&#8212;location-format {gnu | msvc}&#187;. GNU-form\u00e1t sa zobrazuje<br \/>\n   ako &#171;filename:line:column:&#187;, zatia\u013e \u010do MSVC-form\u00e1t &#8212; ako &#171;filename(line,column)&#187;.<br \/>\n   T\u00e1to mo\u017enos\u0165 m\u00f4\u017ee by\u0165 u\u017eito\u010dn\u00e1 pre milovn\u00edkov IDE.<br \/>\n   Bola pridan\u00e1 aj mo\u017enos\u0165 &#171;&#8212;verbose&#187;, ktor\u00e1 vypisuje stru\u010dn\u00fa v\u00ed\u0165azn\u00fa spr\u00e1vu v pr\u00edpade \u00faspechu.                                                 <\/p>\n<li class=\"l\"> Vylep\u0161en\u00fd re\u017eim &#171;kompatibility&#187; s flex &#8212; opravili sa niektor\u00e9 chyby parsovania a<br \/>\n   nespr\u00e1vny priority oper\u00e1torov v zriedkav\u00fdch pr\u00edpadoch.<br \/>\n   Historicky bola mo\u017enos\u0165 &#171;-F &#8212;flex-support&#187; navrhnut\u00e1 na p\u00edsanie k\u00f3du<br \/>\n   v zmie\u0161anom \u0161t\u00fdle flex a re2c, \u010do s\u0165a\u017euje syntaktick\u00e9 spracovanie.<br \/>\n   Re\u017eim kompatibility s flex sa zriedka pou\u017e\u00edva v novom k\u00f3de,<br \/>\n   ale re2c ho na\u010falej podporuje pre sp\u00e4tn\u00fa kompatibilitu.<\/p>\n<li class=\"l\"> Oper\u00e1tor od\u010d\u00edtania znakov\u00fdch tried &#171; \/ &#187; sa teraz aplikuje<br \/>\n   pred spusten\u00edm k\u00f3dovania, \u010do umo\u017e\u0148uje jeho pou\u017eitie v v\u00e4\u010d\u0161om po\u010dte pr\u00edpadov,<br \/>\n   ak je pou\u017eit\u00e1 k\u00f3dovanie s premennou d\u013a\u017ekou znaku (napr\u00edklad UTF8).<\/p>\n<li class=\"l\"> V\u00fdstupn\u00fd s\u00fabor sa teraz vytv\u00e1ra atom\u00e1rne: re2c najprv vytvor\u00ed do\u010dasn\u00fd s\u00fabor<br \/>\n   a zapisuje do neho v\u00fdsledok, a potom premen\u00fava do\u010dasn\u00fd s\u00fabor na v\u00fdstupn\u00fd<br \/>\n   jednou oper\u00e1ciou.<\/p>\n<li class=\"l\"> Dokument\u00e1cia bola dop\u00edsan\u00e1 a prepracovan\u00e1; najm\u00e4 boli pridan\u00e9 nov\u00e9<br \/>\n   kapitoly o <noindex><a rel=\"nofollow\" href=\"http:\/\/re2c.org\/manual\/manual.html#buffer-refilling\">http:\/\/re2c.org\/manual\/manual.html#buffer-refilling dop\u013a\u0148an\u00ed vyrovn\u00e1vacej pam\u00e4te<\/a><\/noindex><br \/>\n   a <noindex><a rel=\"nofollow\" href=\"http:\/\/re2c.org\/manual\/manual.html#eof-handling\">o sp\u00f4soboch kontroly konca vstupn\u00fdch \u00fadajov<\/a><\/noindex>.<br \/>\n   Nov\u00e1 dokument\u00e1cia je zhroma\u017eden\u00e1 vo forme<br \/>\n   <noindex><a rel=\"nofollow\" href=\"http:\/\/re2c.org\/manual\/manual.html\">komplexn\u00e9ho jednolistov\u00e9ho sprievodcu<\/a><\/noindex><br \/>\n   s pr\u00edkladmi (rovnak\u00e9 zdrojov\u00e9 s\u00fabory sa vykres\u013euj\u00fa v manpage a v online dokument\u00e1cii).<br \/>\n   Boli podniknut\u00e9 slab\u00e9 pokusy o zlep\u0161enie \u010ditate\u013enosti webu na telef\u00f3noch.<\/p>\n<li class=\"l\"> Z poh\u013eadu v\u00fdvoj\u00e1rov re2c z\u00edskal lep\u0161iu podporn\u00fa subsyst\u00e9my<br \/>\n   debugovania. Ladic\u00ed k\u00f3d je teraz vypnut\u00fd v produk\u010dn\u00fdch zostav\u00e1ch a<br \/>\n   m\u00f4\u017ee by\u0165 zapnut\u00fd pomocou konfigura\u010dnej mo\u017enosti &#171;&#8212;enable-debug&#187;.<\/p>\n<\/ul>\n<p><noindex><a rel=\"nofollow\" name=\"link\"><\/a><\/noindex><\/p>\n<p>Zdroj: <a \ncontent=\"nofollow\" rel=\"nofollow\" href=\"https:\/\/www.opennet.ru\/opennews\/art.shtml?num=51209\">opennet.ru<\/a><\/p>","protected":false,"gt_translate_keys":[{"key":"rendered","format":"html"}]},"excerpt":{"rendered":"<p>\u0421\u043e\u0441\u0442\u043e\u044f\u043b\u0441\u044f \u0440\u0435\u043b\u0438\u0437 re2c, \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\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 \u043a\u043e\u0434\u043e\u0432\u0443\u044e \u0431\u0430\u0437\u0443. \u0421 \u0442\u0435\u0445 \u043f\u043e\u0440 [&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-36745","post","type-post","status-publish","format-standard","hentry","category-news"],"aioseo_notices":[],"aioseo_head":"\n\t\t<!-- All in One SEO 5.0.4 - aioseo.com -->\n\t<meta name=\"description\" content=\"\u0421\u043e\u0441\u0442\u043e\u044f\u043b\u0441\u044f \u0440\u0435\u043b\u0438\u0437 re2c, \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.\" \/>\n\t<meta name=\"robots\" content=\"max-image-preview:large\" \/>\n\t<meta name=\"author\" content=\"Yuri Gagarin\"\/>\n\t<link rel=\"canonical\" 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