{"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\/hu\/blog\/news\/re2c-1-2","title":{"rendered":"re2c 1.2","gt_translate_keys":[{"key":"rendered","format":"text"}]},"content":{"rendered":"<p>Augusztus 2-\u00e1n, p\u00e9nteken megjelent a re2c - egy szabad lexikai elemz\u0151k gener\u00e1tora C \u00e9s C++ nyelvekhez. Eml\u00e9keztet\u0151\u00fcl, a re2c-t 1993-ban \u00edrta Peter Bambulics k\u00eds\u00e9rleti gener\u00e1tork\u00e9nt, amely rendk\u00edv\u00fcl gyors lexikai elemz\u0151k gener\u00e1l\u00e1s\u00e1ra szolg\u00e1l, \u00e9s a gener\u00e1lt k\u00f3d sebess\u00e9g\u00e9ben, valamint a felhaszn\u00e1l\u00f3i fel\u00fclet szokatlan rugalmass\u00e1g\u00e1ban k\u00fcl\u00f6nb\u00f6zik m\u00e1s gener\u00e1torokt\u00f3l, amely lehet\u0151v\u00e9 teszi az elemz\u0151k k\u00f6nny\u0171 \u00e9s hat\u00e9kony integr\u00e1l\u00e1s\u00e1t a megl\u00e9v\u0151 k\u00f3dalapba. Az\u00f3ta a projekt k\u00f6z\u00f6ss\u00e9gi fejleszt\u00e9s alatt \u00e1ll, \u00e9s tov\u00e1bbra is k\u00eds\u00e9rletek \u00e9s kutat\u00e1sok helysz\u00edne a form\u00e1lis grammatik\u00e1k \u00e9s v\u00e9ges automat\u00e1k ter\u00fclet\u00e9n.<\/p>\n<p>Az 1.2-es verzi\u00f3 f\u0151bb \u00fajdons\u00e1gai:<\/p>\n<ul>\n<li>\n<p>\u00daj (egyszer\u0171s\u00edtett) m\u00f3d ker\u00fclt hozz\u00e1ad\u00e1sra a bemeneti adatok v\u00e9g\u00e9nek ellen\u0151rz\u00e9s\u00e9re<br \/>\n(angolul: \u201eEOF rule\u201d).<br \/>\nEhhez hozz\u00e1adva a re2c:eof konfigur\u00e1ci\u00f3t,<br \/>\nmely lehet\u0151v\u00e9 teszi a termin\u00e1lis szimb\u00f3lum kiv\u00e1laszt\u00e1s\u00e1t,<br \/>\nvalamint egy speci\u00e1lis $, amely akkor aktiv\u00e1l\u00f3dik, ha a lexer<br \/>\nsikeresen el\u00e9rte a bemeneti adatok v\u00e9g\u00e9t.<br \/>\nT\u00f6rt\u00e9nelmileg a re2c t\u00f6bbf\u00e9le m\u00f3dot k\u00edn\u00e1l a bemeneti adatok v\u00e9g\u00e9nek<br \/>\nellen\u0151rz\u00e9s\u00e9re, amelyek korl\u00e1tozotts\u00e1g, hat\u00e9konys\u00e1g \u00e9s egyszer\u0171s\u00e9g szempontj\u00e1b\u00f3l v\u00e1ltoznak.<br \/>\nAz \u00faj m\u00f3dszer c\u00e9lja, hogy egyszer\u0171bb\u00e9 tegye a k\u00f3d \u00edr\u00e1s\u00e1t, mik\u00f6zben<br \/>\ntov\u00e1bbra is hat\u00e9kony \u00e9s sz\u00e9lesk\u00f6r\u0171en alkalmazhat\u00f3 marad. A r\u00e9gi m\u00f3dszerek<br \/>\ntov\u00e1bbra is m\u0171k\u00f6dnek, \u00e9s bizonyos esetekben el\u0151nyben r\u00e9szes\u00edthet\u0151k.<\/p>\n<\/li>\n<li>\n<p>Lehet\u0151s\u00e9g ny\u00edlt k\u00fcls\u0151 f\u00e1jlok beilleszt\u00e9s\u00e9re a direkt\u00edv\u00e1val,<br \/>\n\/*!include:re2c &quot;file.re&quot; *\/, \u0433\u0434\u0435 file.re<br \/>\nez a beillesztett f\u00e1jl neve. A re2c a beillesztett f\u00e1jl k\u00f6nyvt\u00e1r\u00e1ban keresi a f\u00e1jlokat,<br \/>\nvalamint az -I opci\u00f3val megadott el\u00e9r\u00e9si utak list\u00e1j\u00e1ban.<br \/>\nA beillesztett f\u00e1jlok m\u00e1s f\u00e1jlokat is beilleszthetnek.<br \/>\nA re2c \u201estandard\u201d f\u00e1jljait az include\/ k\u00f6nyvt\u00e1rban helyezi el,<br \/>\nahol felt\u00e9telezhet\u0151en hasznos defin\u00edci\u00f3k fognak \u00f6sszegy\u0171lni<br \/>\nvalami a standard k\u00f6nyvt\u00e1r szellem\u00e9ben.<br \/>\nEddig 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>\n<li>\n<p>Lehet\u0151s\u00e9g ny\u00edlt \u00f6nk\u00e9nyes<br \/>\na -t &#8212;type-header opci\u00f3kkal (vagy a megfelel\u0151kkal)<br \/>\nkonfigur\u00e1ci\u00f3k) opci\u00f3k \u00e9s az \u00faj direkt\u00edv\u00e1k \/!header:re2c:on\/ \u00e1ltal,<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 \/>\namikor a re2c-nek v\u00e1ltoz\u00f3k, strukt\u00far\u00e1k \u00e9s makr\u00f3k defin\u00edci\u00f3it kell gener\u00e1lnia,<br \/>\nmelyek m\u00e1s ford\u00edt\u00e1si egys\u00e9gekben haszn\u00e1latosak.<\/p>\n<\/li>\n<li>\n<p>A re2c most m\u00e1r \u00e9rtelmezi az UTF8 liter\u00e1lokat \u00e9s a regul\u00e1ris kifejez\u00e9sek karakteroszt\u00e1lyait.<br \/>\nAlap\u00e9rtelmez\u00e9s szerint a re2c olyan kifejez\u00e9seket elemez, mint p\u00e9ld\u00e1ul \u201e\u2200x \u2203y\u201d.<br \/>\n1-bites ASCII karakterek sorozata e2 88 80 78 20 e2 88 83 79<br \/>\n(hex k\u00f3dok), \u00e9s a felhaszn\u00e1l\u00f3knak manu\u00e1lisan kell escape-elni\u00fck a Unicode karaktereket:<br \/>\nEzt \u201eu2200x u2203y\u201d-k\u00e9nt \u00e1br\u00e1zolja. Ez sokak sz\u00e1m\u00e1ra nagyon k\u00e9nyelmetlen \u00e9s v\u00e1ratlan.<br \/>\n(amire folyamatos hibajelent\u00e9sek is utalnak). Ez\u00e9rt most<br \/>\nA re2c biztos\u00edt egy &#8212;input-encoding  opci\u00f3t,<br \/>\namely lehet\u0151v\u00e9 teszi a viselked\u00e9s megv\u00e1ltoztat\u00e1s\u00e1t, \u00e9s a \u201e\u2200x \u2203y\u201d kifejez\u00e9s elemz\u00e9s\u00e9t<br \/>\n2200 78 20 2203 79.<\/p>\n<\/li>\n<li>\n<p>A re2c most m\u00e1r lehet\u0151v\u00e9 teszi a norm\u00e1l re2c-blokkok haszn\u00e1lat\u00e1t -r &#8212;reuse m\u00f3dban.<br \/>\nEz k\u00e9nyelmes, ha a bemeneti f\u00e1jl sok blokkot tartalmaz, \u00e9s csak n\u00e9h\u00e1nyra<br \/>\nvan sz\u00fcks\u00e9g \u00fajrahaszn\u00e1latra.<\/p>\n<\/li>\n<li>\n<p>Lehet\u0151s\u00e9g ny\u00edlt a figyelmeztet\u00e9sek \u00e9s hibajelz\u00e9sek form\u00e1tum\u00e1nak megad\u00e1s\u00e1ra<br \/>\naz \u00faj &#8212;location-format  opci\u00f3val. A GNU-form\u00e1tum megjelenik<br \/>\nmint filename:line:column:, m\u00edg az MSVC-form\u00e1tum &#8212; mint filename(line,column).<br \/>\nEz a lehet\u0151s\u00e9g hasznos lehet az IDE kedvel\u0151inek.<br \/>\nEgy &#8212;verbose opci\u00f3 is hozz\u00e1 lett adva, amely siker eset\u00e9n r\u00f6vid gy\u0151zelmi \u00fczenetet \u00edr ki.<\/p>\n<\/li>\n<li>\n<p>A \u201ekompatibilit\u00e1s\u201d \u00fczemm\u00f3dot is tov\u00e1bbfejlesztett\u00e9k a flex-szel &#8212; kijav\u00edtott\u00e1k a parsing n\u00e9h\u00e1ny hib\u00e1j\u00e1t, \u00e9s<br \/>\na m\u0171veletek helytelen priorit\u00e1s\u00e1t ritka esetekben.<br \/>\nT\u00f6rt\u00e9nelmileg az -F &#8212;flex-support opci\u00f3 lehet\u0151v\u00e9 teszi a k\u00f3d \u00edr\u00e1s\u00e1t<br \/>\nflex st\u00edlusban \u00e9s re2c st\u00edlusban, ami n\u00e9mileg megnehez\u00edti a szintaxis elemz\u00e9s\u00e9t.<br \/>\nA flex kompatibilit\u00e1si m\u00f3d ritk\u00e1n haszn\u00e1latos \u00faj k\u00f3dban,<br \/>\nde a re2c tov\u00e1bbra is t\u00e1mogatja a visszafel\u00e9 kompatibilit\u00e1s \u00e9rdek\u00e9ben.<\/p>\n<\/li>\n<li>\n<p>A karakteroszt\u00e1lyok kivon\u00e1si oper\u00e1tora \/ most alkalmaz\u00e1sra ker\u00fcl<br \/>\nmiel\u0151tt a k\u00f3dol\u00e1s kifejt\u00e9sre ker\u00fclne, ami lehet\u0151v\u00e9 teszi a nagyobb alkalmaz\u00e1st,<br \/>\nha v\u00e1ltoz\u00f3 hossz\u00fas\u00e1g\u00fa karakterk\u00f3dol\u00e1s (p\u00e9ld\u00e1ul UTF8) haszn\u00e1latos.<\/p>\n<\/li>\n<li>\n<p>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 \/>\nfolyamat egy l\u00e9p\u00e9sben.<\/p>\n<\/li>\n<li>\n<p>A dokument\u00e1ci\u00f3t kieg\u00e9sz\u00edtett\u00e9k \u00e9s \u00fajra\u00edrt\u00e1k; k\u00fcl\u00f6n\u00f6sen \u00faj<br \/>\n<noindex>fejezetek ker\u00fcltek hozz\u00e1ad\u00e1sra <a rel=\"nofollow\" href=\"http:\/\/re2c.org\/manual\/manual.html#buffer-refilling\">a puffert\u00f6lt\u00e9sr\u0151l<\/a><\/noindex><br \/>\n\u00e9s <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>.<br \/>\nAz \u00faj dokument\u00e1ci\u00f3 egy<br \/>\n<a rel=\"nofollow\" href=\"http:\/\/re2c.org\/manual\/manual.html\">\u00e1tfog\u00f3 egyoldalas k\u00e9zik\u00f6nyv form\u00e1j\u00e1ban k\u00e9sz\u00fclt<\/a><br \/>\np\u00e9ld\u00e1kkal (ugyanazok az forr\u00e1sok jelennek meg a manpage-ben \u00e9s az online dokument\u00e1ci\u00f3ban).<br \/>\nGyenge pr\u00f3b\u00e1lkoz\u00e1sokat tettek a weboldal olvashat\u00f3s\u00e1g\u00e1nak jav\u00edt\u00e1s\u00e1ra mobiltelefonokon.<\/p>\n<\/li>\n<li>\n<p>A fejleszt\u0151k szempontj\u00e1b\u00f3l a re2c egy teljesebb debugg\u00e1l\u00f3 alrendszert kapott.<br \/>\nA debug k\u00f3d mostanra ki van kapcsolva a kiadott verzi\u00f3kban.<br \/>\nez a configure- lehet\u0151s\u00e9ggel &#8212;enable-debug aktiv\u00e1lhat\u00f3.<\/p>\n<\/li>\n<\/ul>\n<p>Ez a kiad\u00e1s sok\u00e1ig tartott &#8212; k\u00f6zel egy \u00e9vig.<br \/>\nMint mindig, a legt\u00f6bb id\u0151 a teoretikai alapok kidolgoz\u00e1s\u00e1ra \u00e9s a meg\u00edr\u00e1sra ment el<br \/>\ncikkb\u0151l sz\u00e1rmaznak <a rel=\"nofollow\" href=\"http:\/\/re2c.org\/2019_borsotti_trofimovich_efficient_posix_submatch_extraction_on_nfa.pdf\">\u201eHat\u00e9kony POSIX al\u00e1rendelt kifejez\u00e9s kiemel\u00e9s NFA-n\u201d<\/a>.<br \/>\nA cikkben le\u00edrt algoritmusok az k\u00eds\u00e9rleti libre2c k\u00f6nyvt\u00e1rban tal\u00e1lhat\u00f3k.<br \/>\n(a k\u00f6nyvt\u00e1r \u00e9s az benchmarkok ford\u00edt\u00e1sa alap\u00e9rtelmezetten ki van kapcsolva, \u00e9s a konfigur\u00e1ci\u00f3s opci\u00f3val kapcsolhat\u00f3 be<br \/>\n&#8212;enable-libs). A k\u00f6nyvt\u00e1r nem versenyk\u00e9pes a m\u00e1r megl\u00e9v\u0151kkel.<br \/>\n(amelyek k\u00e9s\u0151bb haszn\u00e1lhat\u00f3k re2c-ben vagy m\u00e1s projektekben).<br \/>\nEz a tesztel\u00e9s, benchmarkok \u00e9s m\u00e1s nyelvekhez val\u00f3 k\u00f6t\u00f6d\u00e9s szempontj\u00e1b\u00f3l is el\u0151ny\u00f6s.<br \/>\nK\u00f6sz\u00f6net a re2c fejleszt\u0151it\u0151l mindenkinek, aki seg\u00edtett ezt a kiad\u00e1st megval\u00f3s\u00edtani,<\/p>\n<p>\u00e9s a k\u00f6z\u00f6ss\u00e9gnek az \u00f6tletek\u00e9rt, hibajelent\u00e9sek\u00e9rt, jav\u00edt\u00e1sok\u00e9rt, harci szellem\u00e9rt stb. ;]<br \/>\nAugusztus 2-\u00e1n, p\u00e9nteken megjelent a re2c - egy szabad lexik\u00e1lis elemz\u0151gener\u00e1tor C \u00e9s C++ nyelvekhez.<\/p>\n<p>Forr\u00e1s: <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 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