{"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\/cs\/blog\/news\/vypusk-generatora-leksicheskih-analizatorov-re2c-1-2","title":{"rendered":"Vyd\u00e1n\u00ed gener\u00e1toru lexik\u00e1ln\u00edch analyz\u00e1tor\u016f 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\">Prob\u011bhlo<\/a><\/noindex> vyd\u00e1n\u00ed <noindex><a rel=\"nofollow\" href=\"http:\/\/re2c.org\/\">re2c<\/a><\/noindex>, 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 ostatn\u00edch gener\u00e1tor\u016f li\u0161\u00ed rychlost\u00ed vygenerovan\u00e9ho k\u00f3du a neobvykle flexibiln\u00edm u\u017eivatelsk\u00fdm rozhran\u00edm, kter\u00e9 umo\u017e\u0148uje snadnou a efektivn\u00ed integraci analyz\u00e1tor\u016f do st\u00e1vaj\u00edc\u00ed k\u00f3dov\u00e9 z\u00e1kladny. Od t\u00e9 doby projekt pokra\u010duje ve v\u00fdvoji komunitou a st\u00e1le z\u016fst\u00e1v\u00e1 m\u00edstem pro experimenty a v\u00fdzkum v oblasti form\u00e1ln\u00edch gramatik a kone\u010dn\u00fdch automat\u016f.<\/p>\n<p>P\u0159\u00edprava vyd\u00e1n\u00ed trvala t\u00e9m\u011b\u0159 cel\u00fd rok. V\u011bt\u0161ina \u010dasu, jak je obvykl\u00e9, byla v\u011bnov\u00e1na v\u00fdvoji teoretick\u00e9 z\u00e1kladny a psan\u00ed<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 popsan\u00e9 v \u010dl\u00e1nku jsou implementov\u00e1ny v experiment\u00e1ln\u00ed knihovn\u011b libre2c<br \/>\n(kompilace knihovny a test\u016f v\u00fdkonu je ve v\u00fdchoz\u00edm nastaven\u00ed vypnuta a lze ji zapnout pomoc\u00ed konfigura\u010dn\u00ed volby &#171;&#8212;enable-libs&#187;). Knihovna nen\u00ed zam\u00fd\u0161lena jako konkurence ji\u017e existuj\u00edc\u00edm projekt\u016fm, jako je RE2, ale jako v\u00fdzkumn\u00e1 platforma pro v\u00fdvoj nov\u00fdch<br \/>\nalgoritm\u016f (kter\u00e9 mohou b\u00fdt n\u00e1sledn\u011b pou\u017eity v re2c nebo v jin\u00fdch projektech). To je tak\u00e9 v\u00fdhodn\u00e9 z hlediska testov\u00e1n\u00ed, m\u011b\u0159en\u00ed v\u00fdkonu a vytv\u00e1\u0159en\u00ed vazeb pro jin\u00e9 jazyky.<\/p>\n<p>Hlavn\u00ed novinky verze re2c 1.2:<\/p>\n<ul>\n<li class=\"l\"> Byl p\u0159id\u00e1n nov\u00fd zjednodu\u0161en\u00fd zp\u016fsob kontroly konce vstupn\u00edch dat (&#171;EOF rule&#187;). Pro tuto funkcionalitu byla p\u0159id\u00e1na konfigurace &#171;re2c:eof&#187;,<br \/>\n   kter\u00e1 umo\u017e\u0148uje zvolit termin\u00e1ln\u00ed znak,<br \/>\n   a speci\u00e1ln\u00ed pravidlo &#171;$&#187;, kter\u00e9 se spust\u00ed, pokud lexer<br \/>\n   \u00fasp\u011b\u0161n\u011b dos\u00e1hne konce vstupn\u00edch dat.<br \/>\n   Historicky re2c nab\u00edz\u00ed n\u011bkolik zp\u016fsob\u016f, jak zkontrolovat<br \/>\n   konec vstupn\u00edch dat, kter\u00e9 se li\u0161\u00ed podle omezen\u00ed, efektivity a jednoduchosti<br \/>\n   pou\u017eit\u00ed. Nov\u00fd zp\u016fsob m\u00e1 za c\u00edl zjednodu\u0161it psan\u00ed k\u00f3du, p\u0159i\u010dem\u017e<br \/>\n   z\u016fst\u00e1v\u00e1 efektivn\u00ed a \u0161iroce pou\u017eiteln\u00fd. Star\u00e9 zp\u016fsoby<br \/>\n   st\u00e1le funguj\u00ed a mohou b\u00fdt v n\u011bkter\u00fdch p\u0159\u00edpadech preferov\u00e1ny.<\/p>\n<li class=\"l\"> Byla p\u0159id\u00e1na mo\u017enost zahrnut\u00ed extern\u00edch soubor\u016f pomoc\u00ed direktivy<br \/>\n   &#171;include:re2c &#171;file.re&#187; *&#187;, kde &#171;file.re&#187; &#8212; je jm\u00e9no zahrnut\u00e9ho souboru. Re2c vyhled\u00e1v\u00e1 soubory ve slo\u017ece zahrnut\u00e9ho souboru,<br \/>\n   a tak\u00e9 v seznamu cest zadan\u00fdch pomoc\u00ed volby &#171;-I&#187;.<br \/>\n   Zahrnut\u00e9 soubory mohou zahrnovat dal\u0161\u00ed soubory.<br \/>\n   Re2c poskytuje &#171;standardn\u00ed&#187; soubory ve slo\u017ece &#171;include\/&#187;<br \/>\n   projektu &#8212; p\u0159edpokl\u00e1d\u00e1 se, \u017ee tam budou shroma\u017e\u010fov\u00e1ny u\u017eite\u010dn\u00e9 definice<br \/>\n   regul\u00e1rn\u00edch v\u00fdraz\u016f, n\u011bco na zp\u016fsob standardn\u00ed knihovny.<br \/>\n   Zat\u00edm byla na z\u00e1klad\u011b \u017e\u00e1dost\u00ed p\u0159id\u00e1na jedna soubor s definicemi kategori\u00ed Unicode.<\/p>\n<li class=\"l\"> Byla p\u0159id\u00e1na mo\u017enost generovat hlavi\u010dkov\u00e9 soubory s libovoln\u00fdm<br \/>\n   obsahov\u00fdmi pomoc\u00ed voleb &#171;-t &#8212;type-header&#187; (nebo odpov\u00eddaj\u00edc\u00edch<br \/>\n   konfigurac\u00ed) a nov\u00fdmi direktivami &#171;header:re2c:on*&#187; a<br \/>\n   &#171;header:re2c:off*&#187;. To m\u016f\u017ee b\u00fdt u\u017eite\u010dn\u00e9 v p\u0159\u00edpadech,<br \/>\n   kdy\u017e re2c m\u00e1 generovat definice prom\u011bnn\u00fdch, struktur a makro,<br \/>\n   kter\u00e9 se pou\u017e\u00edvaj\u00ed v jin\u00fdch p\u0159eklada\u010d\u00edch.<\/p>\n<li class=\"l\"> Re2c nyn\u00ed rozum\u00ed UTF8 liter\u00e1l\u016fm a t\u0159\u00edd\u00e1m znak\u016f v regul\u00e1rn\u00edch v\u00fdrazech.<br \/>\n   Ve v\u00fdchoz\u00edm nastaven\u00ed re2c analyzuje v\u00fdrazy jako &#171;&#8704;x &#8707;y&#187; jako<br \/>\n   sekvenci 1-bitov\u00fdch ASCII znak\u016f &#171;e2 88 80 78 20 e2 88 83 79&#187;<br \/>\n   (hex-k\u00f3dy), a u\u017eivatel\u00e9 mus\u00ed ru\u010dn\u011b escapovat Unicode znaky:<br \/>\n   &#171;u2200x &#092;u2203y&#187;. To je pro mnoh\u00e9<br \/>\n   co\u017e dokazuj\u00ed neust\u00e1l\u00e9 reporty chyb. Proto nyn\u00ed<br \/>\n   re2c poskytuje volbu &#171;&#8212;input-encoding {ascii | utf8}&#187;,<br \/>\n   kter\u00e1 umo\u017e\u0148uje zm\u011bnit chov\u00e1n\u00ed a analyzovat &#171;&#8704;x &#8707;y&#187; jako<br \/>\n   &#171;2200 78 20 2203 79&#187;.<\/p>\n<li class=\"l\"> Re2c nyn\u00ed umo\u017e\u0148uje pou\u017e\u00edvat b\u011b\u017en\u00e9 re2c bloky v re\u017eimu &#171;-r &#8212;reuse&#187;.<br \/>\n   To je u\u017eite\u010dn\u00e9, pokud vstupn\u00ed soubor obsahuje mnoho blok\u016f a pouze \u010d\u00e1st z nich<br \/>\n   pot\u0159ebuje op\u011btovn\u00e9 pou\u017eit\u00ed.<\/p>\n<li class=\"l\"> Byla p\u0159id\u00e1na mo\u017enost nastavovat form\u00e1t varov\u00e1n\u00ed a chybov\u00fdch zpr\u00e1v<br \/>\n   pomoc\u00ed nov\u00e9 volby &#171;&#8212;location-format {gnu | msvc}&#187;. GNU form\u00e1t se zobrazuje<br \/>\n   jako &#171;filename:line:column:&#187;, a MSVC form\u00e1t &#8212; jako &#171;filename(line,column)&#187;.<br \/>\n   Tato funkce se m\u016f\u017ee hodit milovn\u00edk\u016fm IDE.<br \/>\n   Tak\u00e9 byla p\u0159id\u00e1na volba &#171;&#8212;verbose&#187;, kter\u00e1 vypisuje kr\u00e1tk\u00e9 v\u00edt\u011bzn\u00e9 zpr\u00e1vy v p\u0159\u00edpad\u011b \u00fasp\u011bchu.                                                 <\/p>\n<li class=\"l\"> Byl vylep\u0161en re\u017eim &#171;kompatibility&#187; s flex &#8212; byly opraveny n\u011bkter\u00e9 chyby anal\u00fdzy a<br \/>\n   nespr\u00e1vn\u00e1 priorita operator\u016f v ojedin\u011bl\u00fdch p\u0159\u00edpadech.<br \/>\n   Historicky volba &#171;-F &#8212;flex-support&#187; umo\u017e\u0148uje ps\u00e1t k\u00f3d<br \/>\n   sm\u00ed\u0161en\u011b ve stylu flex a ve stylu re2c, co\u017e pon\u011bkud komplikuje syntaktickou anal\u00fdzu.<br \/>\n   Re\u017eim kompatibility s flex se vz\u00e1cn\u011b pou\u017e\u00edv\u00e1 v nov\u00e9m k\u00f3du,<br \/>\n   ale re2c jej i nad\u00e1le podporuje pro zp\u011btnou kompatibilitu.<\/p>\n<li class=\"l\"> Oper\u00e1tor ode\u010d\u00edt\u00e1n\u00ed znakov\u00fdch t\u0159\u00edd &#171;\/&#187; nyn\u00ed plat\u00ed<br \/>\n   p\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 \/>\n   pokud se pou\u017e\u00edv\u00e1 k\u00f3dov\u00e1n\u00ed s prom\u011bnlivou d\u00e9lkou znaku (nap\u0159\u00edklad UTF8).<\/p>\n<li class=\"l\"> V\u00fdstupn\u00ed soubor je nyn\u00ed vytv\u00e1\u0159en atom\u00e1rn\u011b: re2c nejprve vytvo\u0159\u00ed do\u010dasn\u00fd soubor<br \/>\n   a zap\u00ed\u0161e do n\u011bj v\u00fdsledek, a pot\u00e9 p\u0159ejmenuje do\u010dasn\u00fd soubor na v\u00fdstupn\u00ed<br \/>\n   v jedn\u00e9 operaci.<\/p>\n<li class=\"l\"> Dokumentace byla dopln\u011bna a p\u0159epracov\u00e1na; zejm\u00e9na byly p\u0159id\u00e1ny 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 napln\u011bn\u00ed vyrovn\u00e1vac\u00ed pam\u011bti<\/a><\/noindex><br \/>\n   a <noindex><a rel=\"nofollow\" href=\"http:\/\/re2c.org\/manual\/manual.html#eof-handling\">o zp\u016fsobech kontroly konce vstupn\u00edch dat<\/a><\/noindex>.<br \/>\n   Nov\u00e1 dokumentace byla shrom\u00e1\u017ed\u011bna jako<br \/>\n   <noindex><a rel=\"nofollow\" href=\"http:\/\/re2c.org\/manual\/manual.html\">vy\u010derp\u00e1vaj\u00edc\u00ed jednoho str\u00e1nkov\u00e9ho pr\u016fvodce<\/a><\/noindex><br \/>\n   s p\u0159\u00edklady (ty stejn\u00e9 zdrojov\u00e9 materi\u00e1ly jsou vykreslov\u00e1ny v manpage a v online dokumentaci).<br \/>\n   Byly u\u010din\u011bny slab\u00e9 pokusy o zlep\u0161en\u00ed \u010ditelnosti webu na telefonech.<\/p>\n<li class=\"l\"> Z pohledu v\u00fdvoj\u00e1\u0159\u016f re2c z\u00edskal plnohodnotn\u011bj\u0161\u00ed subsyst\u00e9m.<br \/>\n   lad\u011bn\u00ed. Ladic\u00ed k\u00f3d je nyn\u00ed v uvoln\u011bn\u00fdch sestaven\u00edch vypnut\u00fd a<br \/>\n   lze zapnout pomoc\u00ed konfigura\u010dn\u00ed volby &#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 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