{"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\/sv\/blog\/news\/re2c-2-0","title":{"rendered":"re2c 2.0","gt_translate_keys":[{"key":"rendered","format":"text"}]},"content":{"rendered":"<p>M\u00e5ndagen den 20 juli sl\u00e4pptes re2c \u2013 en generator f\u00f6r snabba lexikala analyser.<br \/>\nHuvudsakliga f\u00f6r\u00e4ndringar:<\/p>\n<ul>\n<li>\n<p>St\u00f6d f\u00f6r programmeringsspr\u00e5ket Go har lagts till.<br \/>\n(Aktiveras antingen med alternativet &#8212;lang go f\u00f6r re2c eller som ett frist\u00e5ende program re2go).<br \/>\nDokumentationen f\u00f6r C och Go genereras fr\u00e5n samma text, men med olika<br \/>\nexempel p\u00e5 kod. Den underliggande kodgenereringssystemet i re2c har helt<br \/>\nomstrukturerats, vilket b\u00f6r underl\u00e4tta st\u00f6det f\u00f6r nya spr\u00e5k i framtiden.<\/p>\n<\/li>\n<li>\n<noindex><\/p>\n<p>Ett alternativt byggsystem p\u00e5 CMake har lagts till (tack <a rel=\"nofollow\" href=\"https:\/\/github.com\/ligfx\">ligfx<\/a>!).<\/noindex><br \/>\nF\u00f6rs\u00f6k att \u00f6vers\u00e4tta re2c till CMake har gjorts l\u00e4nge, men ingen f\u00f6re ligfx har<br \/>\nf\u00f6reslagit en fullst\u00e4ndig l\u00f6sning.<br \/>\nDet gamla byggsystemet p\u00e5 Autotools forts\u00e4tter att st\u00f6das och anv\u00e4ndas,<br \/>\noch det finns inga planer p\u00e5 att \u00f6verge det i den n\u00e4rmaste framtiden (delvis f\u00f6r att inte skapa<br \/>\nproblem f\u00f6r distribut\u00f6rsutvecklare, delvis f\u00f6r att det gamla byggsystemet<br \/>\n\u00e4r stabilare och mer koncist \u00e4n det nya).<br \/>\nB\u00e5da systemen testas kontinuerligt med hj\u00e4lp av Travis CI.<\/p>\n<\/li>\n<li>\n<p>M\u00f6jligheten att ange gr\u00e4nssnittskod i konfigurationer har lagts till vid anv\u00e4ndning av<br \/>\ndet generiska API:et. Tidigare var det mesta API:n tvunget att anges i form av<br \/>\nfunktioner eller funktionella makron. Nu kan de anges som godtyckliga<br \/>\nstr\u00e4ngar med namngivna mallparametrar av typen @@{name} eller helt enkelt @@ (om<br \/>\nparametern \u00e4r en och ingen tvetydighet uppst\u00e5r). API-stilen anges av konfigurationen<br \/>\nre2c:api:style (v\u00e4rdet functions st\u00e4ller in funktionell stil, medan free-form \u00e4r valfri).<\/p>\n<\/li>\n<li>\n<p>Funktionen f\u00f6r alternativet -c, &#8212;start-conditions har f\u00f6rb\u00e4ttrats, vilket m\u00f6jligg\u00f6r kombinering av flera<br \/>\nrelaterade lexers i ett enda re2c-block. Nu kan vanliga block anv\u00e4ndas tillsammans med villkorliga och<br \/>\nflera orelaterade villkorliga block anges i en och samma fil.<br \/>\nFunktionen f\u00f6r alternativet -r, \u2014reuse (\u00e5teranv\u00e4ndning av kod fr\u00e5n ett block<br \/>\nFunktionen f\u00f6r alternativet -r, &#8212;reuse (\u00e5teranv\u00e4ndning av kod fr\u00e5n en block<br \/>\ni andra block) har f\u00f6rb\u00e4ttrats i kombination med alternativen -c, &#8212;start-conditions och -f, &#8212;storable-state<br \/>\noch forts\u00e4tta k\u00f6rningen senare).<br \/>\nEtt fel i den nyligen tillagda algoritmen f\u00f6r att hantera slutet av indata<\/p>\n<\/li>\n<li>\n<p>(EOF-regel) har \u00e5tg\u00e4rdats, vilket i s\u00e4llsynta fall ledde till felaktig behandling<br \/>\nav \u00f6verlappande regler.<br \/>\nProcessen f\u00f6r bootstrapping har f\u00f6renklats. Tidigare f\u00f6rs\u00f6kte byggsystemet dynamiskt hitta en redan<\/p>\n<\/li>\n<li>\n<p>bygge re2c som kunde anv\u00e4ndas f\u00f6r att \u00e5terbygga sig sj\u00e4lv.<br \/>\nen sammanst\u00e4lld re2c som kan anv\u00e4ndas f\u00f6r att ombygga sig sj\u00e4lv.<br \/>\nDet ledde till felaktiga beroenden (eftersom beroendegrafen blev<br \/>\ndynamisk, vilket de flesta byggsystem ogillar).<br \/>\nNu kr\u00e4vs det att man explicit<br \/>\nkonfigurerar byggsystemet och s\u00e4tter variabeln RE2C_FOR_BUILD.<\/p>\n<\/li>\n<\/ul>\n<p>Tack till alla som deltog i f\u00f6rberedelsen av denna version!<\/p>\n<p>K\u00e4lla: <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 5.0.4 - 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