{"id":89487,"date":"2020-07-23T01:42:30","date_gmt":"2020-07-22T23:42:30","guid":{"rendered":"https:\/\/prohoster.info\/blog\/novosti-interneta\/re2c-2-0"},"modified":"2020-07-23T01:42:30","modified_gmt":"2020-07-22T23:42:30","slug":"re2c-2-0","status":"publish","type":"post","link":"https:\/\/prohoster.info\/it\/blog\/news\/re2c-2-0","title":{"rendered":"re2c 2.0","gt_translate_keys":[{"key":"rendered","format":"text"}]},"content":{"rendered":"<p>Luned\u00ec 20 luglio \u00e8 stato rilasciato re2c \u2013 un generatore di analizzatori lessicali veloci.<br \/>\nVariazioni principali:<\/p>\n<ul>\n<li>\n<p>Aggiunta la supporto per il linguaggio Go<br \/>\n(attivato come opzione &#8212;lang go per re2c, o come programma separato re2go).<br \/>\nLa documentazione per C e Go \u00e8 generata dallo stesso testo, ma con esempi di codice diversi.<br \/>\n\u00c8 stata completamente riprogettata la sottosistema di generazione del codice in re2c, il che<br \/>\ndovrebbe facilitare il supporto per nuovi linguaggi in futuro.<\/p>\n<\/li>\n<li>\n<noindex><\/p>\n<p>Aggiunto un sistema di costruzione alternativo su CMake (grazie a <a rel=\"nofollow\" href=\"https:\/\/github.com\/ligfx\">ligfx<\/a>!).<\/noindex><br \/>\nLe tentativi di portare re2c su CMake sono state fatte da tempo, ma fino a ligfx nessuno ha<br \/>\nproposto una soluzione completa.<br \/>\nIl vecchio sistema di costruzione su Autotools continua a essere supportato e utilizzato,<br \/>\ne nel prossimo futuro non ci sono piani per abbandonarlo (in parte per non creare<br \/>\nproblemi agli sviluppatori di distribuzioni, e in parte perch\u00e9 il vecchio sistema di costruzione<br \/>\n\u00e8 pi\u00f9 stabile e conciso rispetto al nuovo).<br \/>\nEntrambi i sistemi sono testati continuamente con Travis CI.<\/p>\n<\/li>\n<li>\n<p>Aggiunta la possibilit\u00e0 di specificare il codice dell'interfaccia nelle configurazioni utilizzando<br \/>\nl'API generica (generic API). Prima la maggior parte delle API doveva essere specificata sotto forma di<br \/>\nfunzioni o macro funzionali. Ora possono essere specificate sotto forma di stringhe arbitrari<br \/>\ncon parametri di template nominati del tipo @@{name} oppure semplicemente @@ (se<br \/>\nc'\u00e8 un solo parametro e non si verifica ambiguit\u00e0). Lo stile dell'API \u00e8 definito dalla configurazione<br \/>\nre2c:api:style (il valore functions definisce uno stile funzionale, mentre free-form &ndash; \u00e8 arbitrario).<\/p>\n<\/li>\n<li>\n<p>Migliorata l'efficacia dell'opzione -c, &#8212;start-conditions, che consente di combinare pi\u00f9<br \/>\nlessori interconnessi in un singolo blocco re2c. Ora \u00e8 possibile utilizzare<br \/>\nblocchi normali insieme a quelli condizionali e specificare pi\u00f9 blocchi condizionali non connessi<br \/>\nin un solo file.<br \/>\nMigliorata l'efficacia dell'opzione -r, &#8212;reuse (riutilizzo del codice da un blocco<br \/>\nin altri blocchi) in combinazione con le opzioni -c, &#8212;start-conditions e -f, &#8212;storable-state<br \/>\n(lessore con stato salvabile, che pu\u00f2 essere interrotto in qualsiasi punto<br \/>\ne continuato in seguito).<\/p>\n<\/li>\n<li>\n<p>Corretto un errore nell'algoritmo recentemente aggiunto per la gestione della fine dei dati in ingresso<br \/>\n(regola EOF), che in rari casi portava a un'erronea elaborazione<br \/>\ndi regole sovrapposte.<\/p>\n<\/li>\n<li>\n<p>Semplificato il processo di bootstrap. In passato, il sistema di costruzione cercava di trovare dinamicamente un re2c gi\u00e0<br \/>\ncompilato da utilizzare per la ricompilazione di se stesso.<br \/>\nQuesto portava a dipendenze errate (poich\u00e9 il grafo delle dipendenze risultava<br \/>\ndinamico, cosa che la maggior parte dei sistemi di build non gradisce).<br \/>\nOra, per ricompilare i lexer, \u00e8 necessario configurare esplicitamente<br \/>\nil sistema di build e impostare la variabile RE2C_FOR_BUILD.<\/p>\n<\/li>\n<\/ul>\n<p>Grazie a tutti coloro che hanno partecipato alla preparazione di questa release!<\/p>\n<p>Fonte: <a \ncontent=\"nofollow\" rel=\"nofollow\" href=\"http:\/\/www.linux.org.ru\/news\/development\/15820642\">linux.org.ru<\/a><\/p>","protected":false,"gt_translate_keys":[{"key":"rendered","format":"html"}]},"excerpt":{"rendered":"<p>\u0412 \u043f\u043e\u043d\u0435\u0434\u0435\u043b\u044c\u043d\u0438\u043a 20 \u0438\u044e\u043b\u044f \u0432\u044b\u0448\u0435\u043b \u0440\u0435\u043b\u0438\u0437 re2c &ndash; \u0433\u0435\u043d\u0435\u0440\u0430\u0442\u043e\u0440\u0430 \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. \u041e\u0441\u043d\u043e\u0432\u043d\u044b\u0435 \u0438\u0437\u043c\u0435\u043d\u0435\u043d\u0438\u044f: \u0414\u043e\u0431\u0430\u0432\u043b\u0435\u043d\u0430 \u043f\u043e\u0434\u0434\u0435\u0440\u0436\u043a\u0430 \u044f\u0437\u044b\u043a\u0430 Go (\u0432\u043a\u043b\u044e\u0447\u0430\u0435\u0442\u0441\u044f \u0438\u043b\u0438 \u043e\u043f\u0446\u0438\u0435\u0439 &#8212;lang go \u0434\u043b\u044f re2c, \u0438\u043b\u0438 \u0432 \u0432\u0438\u0434\u0435 \u043e\u0442\u0434\u0435\u043b\u044c\u043d\u043e\u0439 \u043f\u0440\u043e\u0433\u0440\u0430\u043c\u043c\u044b re2go). \u0414\u043e\u043a\u0443\u043c\u0435\u043d\u0442\u0430\u0446\u0438\u044f \u0434\u043b\u044f C \u0438 Go \u0433\u0435\u043d\u0435\u0440\u0438\u0440\u0443\u0435\u0442\u0441\u044f \u0438\u0437 \u043e\u0434\u043d\u043e\u0433\u043e \u0438 \u0442\u043e\u0433\u043e \u0436\u0435 \u0442\u0435\u043a\u0441\u0442\u0430, \u043d\u043e \u0441 \u0440\u0430\u0437\u043d\u044b\u043c\u0438 \u043f\u0440\u0438\u043c\u0435\u0440\u0430\u043c\u0438 \u043a\u043e\u0434\u0430. \u041f\u043e\u043b\u043d\u043e\u0441\u0442\u044c\u044e \u043f\u0435\u0440\u0435\u0440\u0430\u0431\u043e\u0442\u0430\u043d\u0430 \u043f\u043e\u0434\u0441\u0438\u0441\u0442\u0435\u043c\u0430 \u043a\u043e\u0434\u043e\u0433\u0435\u043d\u0435\u0440\u0430\u0446\u0438\u0438 \u0432 re2c, \u0447\u0442\u043e [&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-89487","post","type-post","status-publish","format-standard","hentry","category-news"],"aioseo_notices":[],"aioseo_head":"\n\t\t<!-- All in One SEO 5.0.1.1 - aioseo.com -->\n\t<meta name=\"description\" content=\"\u0412 \u043f\u043e\u043d\u0435\u0434\u0435\u043b\u044c\u043d\u0438\u043a 20 \u0438\u044e\u043b\u044f \u0432\u044b\u0448\u0435\u043b \u0440\u0435\u043b\u0438\u0437 re2c \u2013 \u0433\u0435\u043d\u0435\u0440\u0430\u0442\u043e\u0440\u0430 \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.\" \/>\n\t<meta name=\"robots\" content=\"max-image-preview:large\" 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