{"id":104162,"date":"2022-05-26T21:37:04","date_gmt":"2022-05-26T19:37:04","guid":{"rendered":"https:\/\/prohoster.info\/blog\/novosti-interneta\/perl-7-plavno-prodolzhit-razvitie-perl-5-bez-narusheniya-obratnoj-sovmestiosti"},"modified":"2022-05-26T21:37:04","modified_gmt":"2022-05-26T19:37:04","slug":"perl-7-plavno-prodolzhit-razvitie-perl-5-bez-narusheniya-obratnoj-sovmestiosti","status":"publish","type":"post","link":"https:\/\/prohoster.info\/cs\/blog\/news\/perl-7-plavno-prodolzhit-razvitie-perl-5-bez-narusheniya-obratnoj-sovmestiosti","title":{"rendered":"Perl 7 hladce nav\u00e1\u017ee na v\u00fdvoj Perl 5 bez poru\u0161en\u00ed zp\u011btn\u00e9 kompatibility","gt_translate_keys":[{"key":"rendered","format":"text"}]},"content":{"rendered":"

Spr\u00e1vn\u00ed rada projektu Perl shrnula pl\u00e1ny pro dal\u0161\u00ed v\u00fdvoj v\u011btve Perl 5 a vytvo\u0159en\u00ed v\u011btve Perl 7. B\u011bhem diskuz\u00ed se spr\u00e1vn\u00ed rada shodla, \u017ee nen\u00ed p\u0159ijateln\u00e9 poru\u0161ovat kompatibilitu s ji\u017e napsan\u00fdm k\u00f3dem pro Perl 5, s v\u00fdjimkou p\u0159\u00edpad\u016f, kdy je poru\u0161en\u00ed kompatibility nezbytn\u00e9 k odstran\u011bn\u00ed zranitelnost\u00ed. Rada tak\u00e9 dosp\u011bla k z\u00e1v\u011bru, \u017ee jazyk by m\u011bl pokra\u010dovat v rozvoji a je t\u0159eba intenzivn\u011bji propagovat nov\u00e9 funkce, p\u0159i\u010dem\u017e by se m\u011bla zjednodu\u0161it dostupnost nov\u00fdch inovac\u00ed a podpo\u0159it jejich zav\u00e1d\u011bn\u00ed. <\/p>\n

Na rozd\u00edl od p\u016fvodn\u00edch z\u00e1m\u011br\u016f, kter\u00e9 umo\u017e\u0148ovaly za\u0159azen\u00ed zm\u011bn poru\u0161uj\u00edc\u00edch zp\u011btnou kompatibilitu do v\u011btve Perl 7 jako v\u00fdchoz\u00ed, nov\u00fd pl\u00e1n p\u0159edpokl\u00e1d\u00e1 postupn\u00e9 transformov\u00e1n\u00ed v\u011btve Perl 5 na Perl 7 bez poru\u0161en\u00ed zp\u011btn\u00e9 kompatibility s ji\u017e existuj\u00edc\u00edm k\u00f3dem. Verze Perl 7.0 nebude koncep\u010dn\u011b odli\u0161n\u00e1 od dal\u0161\u00ed v\u011btve Perl 5.xx. <\/p>\n

V\u00fdvoj nov\u00fdch verz\u00ed Perl 5 bude pokra\u010dovat ve stejn\u00e9m duchu \u2014 nov\u00e9 funkce, kter\u00e9 nejsou kompatibiln\u00ed se star\u00fdm k\u00f3dem, budou jako d\u0159\u00edve zahrnuty pouze p\u0159i v\u00fdslovn\u00e9m uveden\u00ed v k\u00f3du pragmy \u201euse verze\u201c nebo \u201euse feature funkce\u201c. Nap\u0159\u00edklad ve verzi Perl 5.010 bylo p\u0159edstaveno nov\u00e9 kl\u00ed\u010dov\u00e9 slovo \u201esay\u201c, ale proto\u017ee v existuj\u00edc\u00edm k\u00f3du mohly b\u00fdt pou\u017eity funkce s n\u00e1zvem \u201esay\u201c, podpora nov\u00e9ho kl\u00ed\u010dov\u00e9ho slova byla aktivov\u00e1na pouze p\u0159i v\u00fdslovn\u00e9m uveden\u00ed pragmy \u201euse feature 'say'\u201c. <\/p>\n

Nov\u00fd syntax, kter\u00fd p\u0159i zpracov\u00e1n\u00ed v minul\u00fdch verz\u00edch zp\u016fsoboval chybu, se st\u00e1v\u00e1 dostupn\u00fdm okam\u017eit\u011b bez nutnosti specifikovat speci\u00e1ln\u00ed pragmy. Nap\u0159\u00edklad v Perlu 5.36 se objev\u00ed zjednodu\u0161en\u00e1 syntaxe pro jednor\u00e1zov\u00e9 zpracov\u00e1n\u00ed n\u011bkolika hodnot seznamu (\u201eforeach my ($key, $value) (%hash) {\u201e), kter\u00e1 bude dostupn\u00e1 okam\u017eit\u011b, i v k\u00f3du bez pragmy \u201euse v5.36\u201c. <\/p>\n

Ve st\u00e1vaj\u00edc\u00ed podob\u011b v Perlu 5.36, p\u0159i pou\u017eit\u00ed pragmy \u201euse v5.36\u201c, se aktivuje 13 funkc\u00ed poru\u0161uj\u00edc\u00edch kompatibilitu (\u201esay\u201c, \u201estate\u201c, \u201ecurrent_sub\u201c, \u201efc\u201c, \u201elexical_subs\u201c, \u201esignatures\u201c, \u201eisa\u201c, \u201ebareword_filehandles\u201c, \u201ebitwise\u201c, \u201eevalbytes\u201c, \u201epostderef_qq\u201c, \u201eunicode_eval\u201c a \u201eunicode_strings\u201c), re\u017eimy \u201euse strict\u201c a \u201euse warnings\u201c se zahrnuj\u00ed jako v\u00fdchoz\u00ed a podpora zastaral\u00e9 nep\u0159\u00edm\u00e9 notace vol\u00e1n\u00ed objekt\u016f (kdy se m\u00edsto \u201e->\u201c pou\u017e\u00edv\u00e1 mezera) a v\u00edcerozm\u011brn\u00e9 pole a hashe ve stylu Perlu 4 (\u201e$hash{1, 2}\u201c) je deaktivov\u00e1na. <\/p>\n

Kdy\u017e se zm\u011bn\u00ed p\u0159\u00edli\u0161 mnoho, m\u00edsto dal\u0161\u00ed verze Perl 5.x bude vytvo\u0159ena verze Perl 7.0, kter\u00e1 bude jak\u00fdmsi \u0159ezem stavu, ale z\u016fstane pln\u011b zp\u011btn\u011b kompatibiln\u00ed s Perl 5. Pro zahrnut\u00ed zm\u011bn a nastaven\u00ed poru\u0161uj\u00edc\u00edch kompatibilitu bude vy\u017eadov\u00e1no v\u00fdslovn\u00e9 p\u0159id\u00e1n\u00ed v k\u00f3du pragmy \u201euse v7\u201c. Tedy k\u00f3d s pragmou \u201euse v7\u201c lze ch\u00e1pat jako \u201emodern\u00ed Perl\u201c, ve kter\u00e9m jsou dostupn\u00e9 zm\u011bny poru\u0161uj\u00edc\u00ed kompatibilitu jazyka, a bez \u2014 \u201ekonzervativn\u00ed Perl\u201c, kter\u00fd z\u016fstane pln\u011b zp\u011btn\u011b kompatibiln\u00ed s minul\u00fdmi verzemi.
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Zdroj: opennet.ru<\/a> <\/p>","protected":false,"gt_translate_keys":[{"key":"rendered","format":"html"}]},"excerpt":{"rendered":"

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