{"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\/it\/blog\/novosti-interneta\/vypusk-generatora-leksicheskih-analizatorov-re2c-1-2","title":{"rendered":"Rilascio del generatore di analizzatori lessicali 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\">Si \u00e8 svolto<\/a><\/noindex> rilascio <noindex><a rel=\"nofollow\" href=\"http:\/\/re2c.org\/\">re2c<\/a><\/noindex>, un generatore open source di analizzatori lessicali per i linguaggi C e C++. Ricordiamo che re2c \u00e8 stato scritto nel 1993 da Peter Bambulis come generatore sperimentale di analizzatori lessicali molto veloci, distinguendosi dagli altri generatori per la velocit\u00e0 del codice generato e per un'interfaccia utente particolarmente flessibile, che consente di integrare facilmente ed efficacemente gli analizzatori nel codice esistente. Da allora, il progetto \u00e8 cresciuto grazie alla comunit\u00e0 e continua a essere un terreno fertile per esperimenti e ricerche nel campo delle grammatiche formali e degli automi finiti.<\/p>\n<p>La preparazione del rilascio ha richiesto quasi un anno intero. Come sempre, la maggior parte del tempo \u00e8 stata dedicata allo sviluppo della base teorica e alla scrittura<br \/>\n\u0441\u0442\u0430\u0442\u044c\u0438 &#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>\u00ab<br \/>\nGli algoritmi descritti nell'articolo sono implementati nella libreria sperimentale libre2c<br \/>\n(\u0441\u0431\u043e\u0440\u043a\u0430 \u0431\u0438\u0431\u043b\u0438\u043e\u0442\u0435\u043a\u0438 \u0438 \u0442\u0435\u0441\u0442\u043e\u0432 \u043f\u0440\u043e\u0438\u0437\u0432\u043e\u0434\u0438\u0442\u0435\u043b\u044c\u043d\u043e\u0441\u0442\u0438 \u0432\u044b\u043a\u043b\u044e\u0447\u0435\u043d\u0430 \u043f\u043e \u0443\u043c\u043e\u043b\u0447\u0430\u043d\u0438\u044e \u0438 \u0432\u043a\u043b\u044e\u0447\u0430\u0435\u0442\u0441\u044f configure-\u043e\u043f\u0446\u0438\u0435\u0439 &#171;&#8212;enable-libs&#187;). \u0411\u0438\u0431\u043b\u0438\u043e\u0442\u0435\u043a\u0430 \u0437\u0430\u0434\u0443\u043c\u0430\u043d\u0430 \u043d\u0435 \u043a\u0430\u043a \u043a\u043e\u043d\u043a\u0443\u0440\u0435\u043d\u0442 \u0443\u0436\u0435 \u0441\u0443\u0449\u0435\u0441\u0442\u0432\u0443\u044e\u0449\u0438\u043c \u043f\u0440\u043e\u0435\u043a\u0442\u0430\u043c, \u0442\u0430\u043a\u0438\u043c \u043a\u0430\u043a RE2, \u0430 \u043a\u0430\u043a \u0438\u0441\u0441\u043b\u0435\u0434\u043e\u0432\u0430\u0442\u0435\u043b\u044c\u0441\u043a\u0430\u044f \u043f\u043b\u043e\u0449\u0430\u0434\u043a\u0430 \u0434\u043b\u044f \u0440\u0430\u0437\u0440\u0430\u0431\u043e\u0442\u043a\u0438 \u043d\u043e\u0432\u044b\u0445<br \/>\nalgoritmi (che possono poi essere utilizzati in re2c o in altri progetti). Inoltre, questo \u00e8 comodo per il testing, la misurazione delle prestazioni e la creazione di binding ad altri linguaggi.<\/p>\n<p>Le principali novit\u00e0 nella versione re2c 1.2:<\/p>\n<ul>\n<li class=\"l\"> \u0414\u043e\u0431\u0430\u0432\u043b\u0435\u043d \u043d\u043e\u0432\u044b\u0439 \u0443\u043f\u0440\u043e\u0449\u0451\u043d\u043d\u044b\u0439 \u0441\u043f\u043e\u0441\u043e\u0431 \u043f\u0440\u043e\u0432\u0435\u0440\u043a\u0438 \u043a\u043e\u043d\u0446\u0430 \u0432\u0445\u043e\u0434\u043d\u044b\u0445 \u0434\u0430\u043d\u043d\u044b\u0445 (&#171;EOF rule&#187;). \u0414\u043b\u044f \u044d\u0442\u043e\u0433\u043e \u0434\u043e\u0431\u0430\u0432\u043b\u0435\u043d\u0430 \u043a\u043e\u043d\u0444\u0438\u0433\u0443\u0440\u0430\u0446\u0438\u044f &#171;re2c:eof&#187;,<br \/>\n   che consente di scegliere il carattere terminale,<br \/>\n   \u0438 \u0441\u043f\u0435\u0446\u0438\u0430\u043b\u044c\u043d\u043e\u0435 \u043f\u0440\u0430\u0432\u0438\u043b\u043e &#171;$&#187;, \u043a\u043e\u0442\u043e\u0440\u043e\u0435 \u0441\u0440\u0430\u0431\u0430\u0442\u044b\u0432\u0430\u0435\u0442 \u0435\u0441\u043b\u0438 \u043b\u0435\u043a\u0441\u0435\u0440<br \/>\n   raggiunge con successo la fine dei dati di input.<br \/>\n   Storicamente, re2c offre diverse opzioni per il controllo della<br \/>\n   fine dei dati di input, che variano per limitazione, efficacia e semplicit\u00e0<br \/>\n   di utilizzo. Il nuovo metodo \u00e8 progettato per semplificare la scrittura del codice, mantenendo<br \/>\n   l'efficacia e un ampio uso. I metodi precedenti<br \/>\n   continuano a funzionare e possono essere preferibili in casi specifici.<\/p>\n<li class=\"l\"> \u00c8 stata aggiunta la possibilit\u00e0 di includere file esterni tramite la direttiva<br \/>\n   &#171;\/*!include:re2c &#171;file.re&#187; *\/&#187;, \u0433\u0434\u0435 &#171;file.re&#187; &#8212; \u044d\u0442\u043e \u0438\u043c\u044f \u0432\u043a\u043b\u044e\u0447\u0430\u0435\u043c\u0433\u043e \u0444\u0430\u0439\u043b\u0430. Re2c \u0438\u0449\u0435\u0442 \u0444\u0430\u0439\u043b\u044b \u0432 \u0434\u0438\u0440\u0435\u043a\u0442\u043e\u0440\u0438\u0438 \u0432\u043a\u043b\u044e\u0447\u0430\u0449\u0435\u0433\u043e \u0444\u0430\u0439\u043b\u0430,<br \/>\n   \u0430 \u0442\u0430\u043a\u0436\u0435 \u0432 \u0441\u043f\u0438\u0441\u043a\u0435 \u043f\u0443\u0442\u0435\u0439 \u0437\u0430\u0434\u0430\u043d\u043d\u044b\u0445 \u0441 \u043f\u043e\u043c\u043e\u0449\u044c\u044e \u043e\u043f\u0446\u0438\u0438 &#171;-I&#187;.<br \/>\n   I file inclusi possono includere altri file.<br \/>\n   Re2c \u043f\u0440\u0435\u0434\u043e\u0441\u0442\u0430\u0432\u043b\u044f\u0435\u0442 &#171;\u0441\u0442\u0430\u043d\u0434\u0430\u0440\u0442\u043d\u044b\u0435&#187; \u0444\u0430\u0439\u043b\u044b \u0432 \u0434\u0438\u0440\u0435\u043a\u0442\u043e\u0440\u0438\u0438 &#171;include\/&#187;<br \/>\n   \u043f\u0440\u043e\u0435\u043a\u0442\u0430 &#8212; \u043f\u0440\u0435\u0434\u043f\u043e\u043b\u0430\u0433\u0430\u0435\u0442\u0441\u044f, \u0447\u0442\u043e \u0442\u0430\u043c \u0431\u0443\u0434\u0443\u0442 \u043d\u0430\u043a\u0430\u043f\u043b\u0438\u0432\u0430\u0442\u044c\u0441\u044f \u043f\u043e\u043b\u0435\u0437\u043d\u044b\u0435 \u043e\u043f\u0440\u0435\u0434\u0435\u043b\u0435\u043d\u0438\u044f<br \/>\n   di espressioni regolari, qualcosa nel senso di una libreria standard.<br \/>\n   Fino ad ora, su richiesta popolare, \u00e8 stato aggiunto un file con definizioni per le categorie Unicode.<\/p>\n<li class=\"l\"> \u00c8 stata aggiunta la possibilit\u00e0 di generare file di intestazione con contenuti arbitrari<br \/>\n   \u0441\u043e\u0434\u0435\u0440\u0436\u0430\u043d\u0438\u0435\u043c \u043f\u0440\u0438 \u043f\u043e\u043c\u043e\u0449\u0438 \u043e\u043f\u0446\u0438\u0439 &#171;-t &#8212;type-header&#187; (\u0438\u043b\u0438 \u0441\u043e\u043e\u0442\u0432\u0435\u0442\u0441\u0442\u0432\u0443\u044e\u0449\u0438\u0445<br \/>\n   \u043a\u043e\u043d\u0444\u0438\u0433\u0443\u0440\u0430\u0446\u0438\u0439) \u0438 \u043d\u043e\u0432\u044b\u0445 \u0434\u0438\u0440\u0435\u043a\u0442\u0438\u0432 &#171;\/*!header:re2c:on*\/&#187; \u0438<br \/>\n   &#171;\/*!header:re2c:off*\/&#187;. \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 \/>\n   re2c deve generare definizioni di variabili, strutture e macro<br \/>\n   utilizzate in altre unit\u00e0 di traduzione.<\/p>\n<li class=\"l\"> Re2c ora comprende i caratteri letterali UTF8 e le classi di caratteri nelle espressioni regolari.<br \/>\n   \u041f\u043e \u0443\u043c\u043e\u043b\u0447\u0430\u043d\u0438\u044e, re2c \u043f\u0430\u0440\u0441\u0438\u0442 \u0432\u044b\u0440\u0430\u0436\u0435\u043d\u0438\u044f \u0432\u0440\u043e\u0434\u0435 &#171;&#8704;x &#8707;y&#187; \u043a\u0430\u043a<br \/>\n   \u043f\u043e\u0441\u043b\u0435\u0434\u043e\u0432\u0430\u0442\u0435\u043b\u044c\u043d\u043e\u0441\u0442\u044c 1-\u0431\u0438\u0442\u043d\u044b\u0445 ASCII-\u0441\u0438\u043c\u0432\u043e\u043b\u043e\u0432 &#171;e2 88 80 78 20 e2 88 83 79&#187;<br \/>\n   (codici esadecimali), e gli utenti devono eseguire il trattamento dei caratteri Unicode manualmente:<br \/>\n   \u00ab\u2200x \u2203y\u00bb. Questo \u00e8 molto scomodo e inaspettato per molti.<br \/>\n   utenti (come dimostrano i continui bug report). Quindi ora<br \/>\n   re2c offre l'opzione \u00ab\u2014input-encoding {ascii | utf8}\u00bb,<br \/>\n   che consente di modificare il comportamento e analizzare \u00ab\u2200x \u2203y\u00bb come<br \/>\n   \u00ab2200 78 20 2203 79\u00bb.<\/p>\n<li class=\"l\"> Re2c ora consente di utilizzare normali blocchi re2c in modalit\u00e0 \u00ab-r \u2014reuse\u00bb.<br \/>\n   Questo \u00e8 utile se il file di input contiene molti blocchi, e solo una parte di essi<br \/>\n   ha bisogno di essere riutilizzata.<\/p>\n<li class=\"l\"> \u00c8 ora possibile impostare il formato degli avvisi e dei messaggi di errore<br \/>\n   con la nuova opzione \u00ab\u2014location-format {gnu | msvc}\u00bb. Il formato GNU viene visualizzato<br \/>\n   come \u00abfilename:line:column:\u00bb, mentre il formato MSVC \u2014 come \u00abfilename(line,column)\u00bb.<br \/>\n   Questa funzione pu\u00f2 essere utile agli appassionati di IDE.<br \/>\n   \u00c8 stata anche aggiunta l'opzione \u00ab\u2014verbose\u00bb, che stampa un messaggio di vittoria conciso in caso di successo.                                                 <\/p>\n<li class=\"l\"> Raffinato il modo di \u00abcompatibilit\u00e0\u00bb con flex \u2014 corretti alcuni errori di parsing e<br \/>\n   la priorit\u00e0 degli operatori in rari casi.<br \/>\n   Storicamente, l'opzione \u00ab-F \u2014flex-support\u00bb consente di scrivere codice.<br \/>\n   mescolato nello stile flex e nello stile re2c, il che rende un po' pi\u00f9 difficile l'analisi sintattica.<br \/>\n   La modalit\u00e0 di compatibilit\u00e0 con flex \u00e8 raramente utilizzata nel nuovo codice,<br \/>\n   ma re2c continua a supportarla per garantire la retrocompatibilit\u00e0.<\/p>\n<li class=\"l\"> L'operatore di sottrazione dei classi di caratteri \u00ab\/\u00bb ora viene applicato<br \/>\n   fino allo sviluppo della codifica, il che consente di utilizzarlo in un numero maggiore di casi,<br \/>\n   se si utilizza una codifica con lunghezza variabile del carattere (ad esempio UTF8).<\/p>\n<li class=\"l\"> Il file di output viene ora creato in modo atomico: re2c crea prima un file temporaneo<br \/>\n   e scrive il risultato in esso, quindi rinomina il file temporaneo in file di output<br \/>\n   in un'unica operazione.<\/p>\n<li class=\"l\"> La documentazione \u00e8 stata ampliata e riscritta; in particolare, sono stati aggiunti nuovi<br \/>\n   capitoli su <noindex><a rel=\"nofollow\" href=\"http:\/\/re2c.org\/manual\/manual.html#buffer-refilling\">http:\/\/re2c.org\/manual\/manual.html#buffer-refilling il riempimento del buffer<\/a><\/noindex><br \/>\n   e <noindex><a rel=\"nofollow\" href=\"http:\/\/re2c.org\/manual\/manual.html#eof-handling\">sui metodi per il controllo della fine dei dati in ingresso.<\/a><\/noindex>.<br \/>\n   La nuova documentazione \u00e8 stata raccolta in<br \/>\n   <noindex><a rel=\"nofollow\" href=\"http:\/\/re2c.org\/manual\/manual.html\">una guida completa di una sola pagina<\/a><\/noindex><br \/>\n   con esempi (gli stessi sorgenti vengono visualizzati sia nella manpage che nella documentazione online).<br \/>\n   Sono stati fatti timidi tentativi di migliorare la leggibilit\u00e0 del sito sui telefoni.<\/p>\n<li class=\"l\"> Dal punto di vista degli sviluppatori, re2c ha acquisito un sistema secondario pi\u00f9 completo.<br \/>\n   debugging. Il codice di debug \u00e8 ora disattivato nelle build di rilascio e<br \/>\n   pu\u00f2 essere abilitato tramite l'opzione configure \u00ab\u2014enable-debug\u00bb.<\/p>\n<\/ul>\n<p><noindex><a rel=\"nofollow\" name=\"link\"><\/a><\/noindex><\/p>\n<p>Fonte: <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 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