{"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\/hu\/blog\/news\/vypusk-generatora-leksicheskih-analizatorov-re2c-1-2","title":{"rendered":"A re2c 1.2 lexikai elemz\u0151 gener\u00e1tor kiad\u00e1sa","gt_translate_keys":[{"key":"rendered","format":"text"}]},"content":{"rendered":"<p><noindex><a rel=\"nofollow\" href=\"http:\/\/re2c.org\/releases\/release_notes.html\">Megval\u00f3sult<\/a><\/noindex> kiad\u00e1s <noindex><a rel=\"nofollow\" href=\"http:\/\/re2c.org\/\">re2c<\/a><\/noindex>, egy szabad lexikai elemz\u0151 gener\u00e1tor C \u00e9s C++ nyelvekhez. Eml\u00e9keztet\u0151\u00fcl, a re2c-t 1993-ban Peter Bambulis \u00edrta, mint egy k\u00eds\u00e9rleti gener\u00e1tort, amely nagyon gyors lexikai elemz\u0151ket gener\u00e1l, \u00e9s m\u00e1s gener\u00e1torokt\u00f3l elt\u00e9r\u0151en a gener\u00e1lt k\u00f3d sebess\u00e9ge \u00e9s az a rendk\u00edv\u00fcl rugalmas felhaszn\u00e1l\u00f3i fel\u00fclet jellemzi, amely lehet\u0151v\u00e9 teszi az elemz\u0151k hat\u00e9kony be\u00e9p\u00edt\u00e9s\u00e9t a megl\u00e9v\u0151 k\u00f3d alapba. Az\u00f3ta a projekt a k\u00f6z\u00f6ss\u00e9g \u00e1ltal fejl\u0151dik, \u00e9s tov\u00e1bbra is k\u00eds\u00e9rletek \u00e9s kutat\u00e1sok helysz\u00edne a form\u00e1lis gramm\u00e1k \u00e9s v\u00e9ges automat\u00e1k ter\u00e9n.<\/p>\n<p>A kiad\u00e1s el\u0151k\u00e9sz\u00edt\u00e9se csaknem egy \u00e9vet vett ig\u00e9nybe. A legt\u00f6bb id\u0151, mint mindig, a teoretikus alap kivitelez\u00e9s\u00e9re \u00e9s a<br \/>\ncikkek &#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>A &#171;ALTER TABLE&#187; \u00e9s &#171;RENAME TABLE&#187; m\u0171veletekben t\u00e1mogat\u00e1sra ker\u00fclt a &#171;IF EXISTS&#187; felt\u00e9tel, amely lehet\u0151v\u00e9 teszi az oper\u00e1ci\u00f3 v\u00e9grehajt\u00e1s\u00e1t a t\u00e1bla l\u00e9tez\u00e9se eset\u00e9n.<br \/>\nA cikkben le\u00edrt algoritmusok az k\u00eds\u00e9rleti libre2c k\u00f6nyvt\u00e1rban tal\u00e1lhat\u00f3k.<br \/>\n(a k\u00f6nyvt\u00e1r \u00e9s a teljes\u00edtm\u00e9nytesztek gy\u0171jt\u00e9se alap\u00e9rtelmez\u00e9s szerint le van tiltva, \u00e9s a configure-opci\u00f3val &#171;&#8212;enable-libs&#187; lehet aktiv\u00e1lni). A k\u00f6nyvt\u00e1r nem versenyt\u00e1rsnak k\u00e9sz\u00fclt a l\u00e9tez\u0151 projektek, mint p\u00e9ld\u00e1ul a RE2, mellett, hanem kutat\u00e1si ter\u00fcletk\u00e9nt \u00faj fejleszt\u00e9sekhez.<br \/>\nalgoritmusok kifejleszt\u00e9s\u00e9re szolg\u00e1l (amelyek k\u00e9s\u0151bb felhaszn\u00e1lhat\u00f3k a re2c-ben vagy m\u00e1s projektekben). Emellett k\u00e9nyelmes tesztel\u00e9s, teljes\u00edtm\u00e9nym\u00e9r\u00e9s \u00e9s m\u00e1s nyelvekhez val\u00f3 k\u00f6t\u0151d\u00e9sek l\u00e9trehoz\u00e1sa szempontj\u00e1b\u00f3l is.<\/p>\n<p>A re2c 1.2 verzi\u00f3 f\u0151 \u00fajdons\u00e1gai:<\/p>\n<ul>\n<li class=\"l\"> Egy \u00faj egyszer\u0171s\u00edtett m\u00f3dszert adtak hozz\u00e1 a bemeneti adatok v\u00e9g\u00e9t ellen\u0151rz\u0151 &#171;EOF szab\u00e1ly&#187; tesztel\u00e9s\u00e9re. Ehhez hozz\u00e1ad\u00f3dott a &#171;re2c:eof&#187; konfigur\u00e1ci\u00f3,<br \/>\n   mely lehet\u0151v\u00e9 teszi a termin\u00e1lis szimb\u00f3lum kiv\u00e1laszt\u00e1s\u00e1t,<br \/>\n   \u00e9s egy speci\u00e1lis &#171;$&#187; szab\u00e1ly, amely akkor l\u00e9p m\u0171k\u00f6d\u00e9sbe, ha a lexik\u00e1lis elemz\u0151<br \/>\n   sikeresen el\u00e9rte a bemeneti adatok v\u00e9g\u00e9t.<br \/>\n   T\u00f6rt\u00e9nelmileg a re2c t\u00f6bbf\u00e9le m\u00f3dot k\u00edn\u00e1l a bemeneti adatok v\u00e9g\u00e9nek<br \/>\n   ellen\u0151rz\u00e9s\u00e9re, amelyek korl\u00e1tozotts\u00e1g, hat\u00e9konys\u00e1g \u00e9s egyszer\u0171s\u00e9g szempontj\u00e1b\u00f3l v\u00e1ltoznak.<br \/>\n   Az \u00faj m\u00f3dszer c\u00e9lja, hogy egyszer\u0171bb\u00e9 tegye a k\u00f3d \u00edr\u00e1s\u00e1t, mik\u00f6zben<br \/>\n   tov\u00e1bbra is hat\u00e9kony \u00e9s sz\u00e9lesk\u00f6r\u0171en alkalmazhat\u00f3 marad. A r\u00e9gi m\u00f3dszerek<br \/>\n   tov\u00e1bbra is m\u0171k\u00f6dnek, \u00e9s bizonyos esetekben el\u0151nyben r\u00e9szes\u00edthet\u0151k.<\/p>\n<li class=\"l\"> Lehet\u0151s\u00e9g ny\u00edlt k\u00fcls\u0151 f\u00e1jlok beilleszt\u00e9s\u00e9re a direkt\u00edv\u00e1val,<br \/>\n   &#171;\n\/*!include:re2c &#171;file.re&#187; *\n&#187;, ahol &#171;file.re&#187; &#8212; az inklud\u00e1lt f\u00e1jl neve. A Re2c a f\u00e1jlokat az inklud\u00e1l\u00f3 f\u00e1jl k\u00f6nyvt\u00e1r\u00e1ban keresi,<br \/>\n   valamint azokban a helyekben, amelyeket az &#171;-I&#187; opci\u00f3val adtak meg.<br \/>\n   A beillesztett f\u00e1jlok m\u00e1s f\u00e1jlokat is beilleszthetnek.<br \/>\n   A Re2c a &#171;szabv\u00e1nyos&#187; f\u00e1jlokat az &#171;include\/&#187; k\u00f6nyvt\u00e1rban biztos\u00edtja<br \/>\n   a projekthez &#8212; felt\u00e9telezve, hogy ott hasznos defin\u00edci\u00f3k halmoz\u00f3dnak fel<br \/>\n   valami a standard k\u00f6nyvt\u00e1r szellem\u00e9ben.<br \/>\n   Eddig a munkav\u00e1llal\u00f3k k\u00e9r\u00e9s\u00e9re hozz\u00e1ad\u00e1sra ker\u00fclt egy f\u00e1jl a Unicode kateg\u00f3ri\u00e1k defin\u00edci\u00f3ival.<\/p>\n<li class=\"l\"> Lehet\u0151s\u00e9g ny\u00edlt \u00f6nk\u00e9nyes<br \/>\n   a &#171;-t &#8212;type-header&#187; (vagy a megfelel\u0151<br \/>\n   konfigur\u00e1ci\u00f3k) opci\u00f3k seg\u00edts\u00e9g\u00e9vel \u00e9s \u00faj direkt\u00edv\u00e1k &#171;\n\/*!header:re2c:on*\/&#187; \u00e9s<br \/>\n   &#171;\n\/*!header:re2c:off*\/&#187;. Ez hasznos lehet olyan esetekben,<br \/>\n   amikor a re2c-nek v\u00e1ltoz\u00f3k, strukt\u00far\u00e1k \u00e9s makr\u00f3k defin\u00edci\u00f3it kell gener\u00e1lnia,<br \/>\n   melyek m\u00e1s ford\u00edt\u00e1si egys\u00e9gekben haszn\u00e1latosak.<\/p>\n<li class=\"l\"> A re2c most m\u00e1r \u00e9rtelmezi az UTF8 liter\u00e1lokat \u00e9s a regul\u00e1ris kifejez\u00e9sek karakteroszt\u00e1lyait.<br \/>\n   Alap\u00e9rtelmez\u00e9s szerint a re2c olyan kifejez\u00e9seket elemez, mint &#171;&#8704;x &#8707;y&#187;, mint<br \/>\n   1-bites ASCII karakterek sorozatak\u00e9nt &#171;e2 88 80 78 20 e2 88 83 79&#187;<br \/>\n   (hex k\u00f3dok), \u00e9s a felhaszn\u00e1l\u00f3knak manu\u00e1lisan kell escape-elni\u00fck a Unicode karaktereket:<br \/>\n   &#171;&#092;&#092;u2200x &#092;&#092;u2203y&#187;. Ez nagyon k\u00e9nyelmetlen \u00e9s v\u00e1ratlan sokak sz\u00e1m\u00e1ra.<br \/>\n   (amire folyamatos hibajelent\u00e9sek is utalnak). Ez\u00e9rt most<br \/>\n   A re2c biztos\u00edt egy &#171;&#8212;input-encoding {ascii | utf8}&#187; opci\u00f3t,<br \/>\n   amely lehet\u0151v\u00e9 teszi a viselked\u00e9s megv\u00e1ltoztat\u00e1s\u00e1t \u00e9s a &#171;&#8704;x &#8707;y&#187; elemz\u00e9s\u00e9t \u00edgy:<br \/>\n   &#171;2200 78 20 2203 79&#187;.<\/p>\n<li class=\"l\"> A Re2c most lehet\u0151v\u00e9 teszi, hogy hagyom\u00e1nyos re2c blokkokat haszn\u00e1ljunk &#171;-r &#8212;reuse&#187; m\u00f3dban.<br \/>\n   Ez k\u00e9nyelmes, ha a bemeneti f\u00e1jl sok blokkot tartalmaz, \u00e9s csak n\u00e9h\u00e1nyra<br \/>\n   van sz\u00fcks\u00e9g \u00fajrahaszn\u00e1latra.<\/p>\n<li class=\"l\"> Lehet\u0151s\u00e9g ny\u00edlt a figyelmeztet\u00e9sek \u00e9s hibajelz\u00e9sek form\u00e1tum\u00e1nak megad\u00e1s\u00e1ra<br \/>\n   az \u00faj &#171;&#8212;location-format {gnu | msvc}&#187; opci\u00f3val. A GNU-form\u00e1tum megjelenik<br \/>\n   mint &#171;filename:line:column:&#187;, m\u00edg az MSVC-form\u00e1tum &#8212; mint &#171;filename(line,column)&#187;.<br \/>\n   Ez a lehet\u0151s\u00e9g hasznos lehet az IDE kedvel\u0151inek.<br \/>\n   \u00daj opci\u00f3t adtak hozz\u00e1 &#171;&#8212;verbose&#187; n\u00e9ven, amely siker eset\u00e9n r\u00f6vid gy\u0151zelmi \u00fczenetet ad ki.                                                 <\/p>\n<li class=\"l\"> A &#171;kompatibilit\u00e1s&#187; m\u00f3dot a flex-szel fejlesztett\u00e9k, kijav\u00edtott\u00e1k a n\u00e9h\u00e1ny elemz\u00e9si hib\u00e1t \u00e9s<br \/>\n   a m\u0171veletek helytelen priorit\u00e1s\u00e1t ritka esetekben.<br \/>\n   Historikusan a &#171;-F &#8212;flex-support&#187; opci\u00f3 lehet\u0151v\u00e9 teszi a k\u00f3d \u00edr\u00e1s\u00e1t.<br \/>\n   flex st\u00edlusban \u00e9s re2c st\u00edlusban, ami n\u00e9mileg megnehez\u00edti a szintaxis elemz\u00e9s\u00e9t.<br \/>\n   A flex kompatibilit\u00e1si m\u00f3d ritk\u00e1n haszn\u00e1latos \u00faj k\u00f3dban,<br \/>\n   de a re2c tov\u00e1bbra is t\u00e1mogatja a visszafel\u00e9 kompatibilit\u00e1s \u00e9rdek\u00e9ben.<\/p>\n<li class=\"l\"> A karakteroszt\u00e1lyok kivon\u00e1si oper\u00e1tor &#171;\\\/&#187; most m\u00e1r alkalmazhat\u00f3.<br \/>\n   miel\u0151tt a k\u00f3dol\u00e1s kifejt\u00e9sre ker\u00fclne, ami lehet\u0151v\u00e9 teszi a nagyobb alkalmaz\u00e1st,<br \/>\n   ha v\u00e1ltoz\u00f3 hossz\u00fas\u00e1g\u00fa karakterk\u00f3dol\u00e1s (p\u00e9ld\u00e1ul UTF8) haszn\u00e1latos.<\/p>\n<li class=\"l\"> A kimeneti f\u00e1jl most atomikus m\u00f3don k\u00e9sz\u00fcl el: a re2c el\u0151sz\u00f6r egy ideiglenes f\u00e1jlt hoz l\u00e9tre<br \/>\n   \u00e9s abba \u00edrja az eredm\u00e9nyt, majd \u00e1tnevezi az ideiglenes f\u00e1jlt a kimeneti<br \/>\n   folyamat egy l\u00e9p\u00e9sben.<\/p>\n<li class=\"l\"> A dokument\u00e1ci\u00f3t kieg\u00e9sz\u00edtett\u00e9k \u00e9s \u00fajra\u00edrt\u00e1k; k\u00fcl\u00f6n\u00f6sen \u00faj<br \/>\n   fejezetekhez a <noindex><a rel=\"nofollow\" href=\"http:\/\/re2c.org\/manual\/manual.html#buffer-refilling\">http:\/\/re2c.org\/manual\/manual.html#buffer-refilling puffer felt\u00f6lt\u00e9se<\/a><\/noindex><br \/>\n   \u00e9s <noindex><a rel=\"nofollow\" href=\"http:\/\/re2c.org\/manual\/manual.html#eof-handling\">az input adatok v\u00e9g\u00e9nek ellen\u0151rz\u00e9si m\u00f3dszereir\u0151l.<\/a><\/noindex>.<br \/>\n   Az \u00faj dokument\u00e1ci\u00f3 egy<br \/>\n   <noindex><a rel=\"nofollow\" href=\"http:\/\/re2c.org\/manual\/manual.html\">kimer\u00edt\u0151 egylapos \u00fatmutat\u00f3hoz<\/a><\/noindex><br \/>\n   p\u00e9ld\u00e1kkal (ugyanazok az forr\u00e1sok jelennek meg a manpage-ben \u00e9s az online dokument\u00e1ci\u00f3ban).<br \/>\n   Gyenge pr\u00f3b\u00e1lkoz\u00e1sokat tettek a weboldal olvashat\u00f3s\u00e1g\u00e1nak jav\u00edt\u00e1s\u00e1ra mobiltelefonokon.<\/p>\n<li class=\"l\"> A fejleszt\u0151k szempontj\u00e1b\u00f3l a re2c egy teljesebb debugg\u00e1l\u00f3 alrendszert kapott.<br \/>\n   A debug k\u00f3d mostanra ki van kapcsolva a kiadott verzi\u00f3kban.<br \/>\n   be lehet kapcsolni a configure-opci\u00f3 &#171;&#8212;enable-debug&#187; seg\u00edts\u00e9g\u00e9vel.<\/p>\n<\/ul>\n<p><noindex><a rel=\"nofollow\" name=\"link\"><\/a><\/noindex><\/p>\n<p>Forr\u00e1s: <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 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