{"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\/sk\/blog\/news\/perl-7-plavno-prodolzhit-razvitie-perl-5-bez-narusheniya-obratnoj-sovmestiosti","title":{"rendered":"Perl 7 postupne pokra\u010duje vo v\u00fdvoji Perl 5 bez naru\u0161enia sp\u00e4tnej kompatibility","gt_translate_keys":[{"key":"rendered","format":"text"}]},"content":{"rendered":"

Spr\u00e1vna rada projektu Perl zhrnula pl\u00e1ny na \u010fal\u0161\u00ed rozvoj vetvy Perl 5 a vytvorenie vetvy Perl 7. Po\u010das diskusi\u00ed sa spr\u00e1vna rada zhodla, \u017ee je neprijate\u013en\u00e9 poru\u0161ova\u0165 kompatibilitu s u\u017e nap\u00edsan\u00fdm k\u00f3dom pre Perl 5, okrem pr\u00edpadu, ke\u010f je poru\u0161enie kompatibility nevyhnutn\u00e9 na odstr\u00e1nenie zranite\u013enost\u00ed. Rada tie\u017e dospela k z\u00e1veru, \u017ee jazyk by sa mal vyv\u00edja\u0165 a \u017ee by sa mali intenz\u00edvnej\u0161ie propagova\u0165 nov\u00e9 mo\u017enosti, pri\u010dom sa pr\u00edstup k novink\u00e1m u\u013eah\u010d\u00ed a stimuluje ich implement\u00e1cia. <\/p>\n

Na rozdiel od p\u00f4vodn\u00fdch z\u00e1myslov, ktor\u00e9 predpokladali zahrnutie zmien poru\u0161uj\u00facich sp\u00e4tn\u00fa kompatibilitu vo vetve Perl 7 ako predvolen\u00fdch, nov\u00fd pl\u00e1n predpoklad\u00e1 postupn\u00e9 premenenie vetvy Perl 5 na Perl 7 bez poru\u0161ovania sp\u00e4tn\u00e9 kompatibility s u\u017e existuj\u00facim k\u00f3dom. Vydanie Perl 7.0 sa konceptu\u00e1lne nebude l\u00ed\u0161i\u0165 od nasleduj\u00facej vetvy Perl 5.xx. <\/p>\n

V\u00fdvoj nov\u00fdch verzi\u00ed Perl 5 bude pokra\u010dova\u0165 v predch\u00e1dzaj\u00facej podobe \u2014 nov\u00e9 mo\u017enosti, ktor\u00e9 nie s\u00fa kompatibiln\u00e9 so star\u00fdm k\u00f3dom, bud\u00fa zahrnut\u00e9 iba pri jasnom uveden\u00ed v k\u00f3de pragmy \u201euse verzia\u201c alebo \u201euse feature mo\u017enos\u0165\u201c. Napr\u00edklad v verzii Perl 5.010 bolo predstaven\u00e9 nov\u00e9 k\u013e\u00fa\u010dov\u00e9 slovo \u201esay\u201c, no ke\u010f\u017ee v existuj\u00facom k\u00f3de mohli by\u0165 pou\u017eit\u00e9 funkcie s n\u00e1zvom \u201esay\u201c, podpora nov\u00e9ho k\u013e\u00fa\u010dov\u00e9ho slova sa aktivovala iba pri jasnom uveden\u00ed pragmy \u201euse feature 'say'\u201c. <\/p>\n

Nov\u00fd syntaktick\u00fd prvok pridan\u00fd do jazyka, ktor\u00fd sp\u00f4sobil chybu pri spracovan\u00ed v predch\u00e1dzaj\u00facich vydaniach, sa st\u00e1va dostupn\u00fdm okam\u017eite bez potreby \u0161peci\u00e1lnych pragm. Napr\u00edklad v Perl 5.36 sa objav\u00ed zjednodu\u0161en\u00fd syntaktick\u00fd prvok na z\u00e1rove\u0148 spracovanie viacer\u00fdch hodn\u00f4t zo zoznamu (\u201eforeach my ($key, $value) (%hash) {\u201c), ktor\u00fd bude dostupn\u00fd okam\u017eite, aj v k\u00f3de bez pragmy \u201euse v5.36\u201c. <\/p>\n

V s\u00fa\u010dasnej podobe v Perl 5.36 sa pri pou\u017eit\u00ed pragmy \u201euse v5.36\u201c aktivuje 13 nekompatibiln\u00fdch mo\u017enost\u00ed ('say', 'state', 'current_sub', 'fc', 'lexical_subs', 'signatures', 'isa', 'bareword_filehandles', 'bitwise', 'evalbytes', 'postderef_qq', 'unicode_eval' a 'unicode_strings'), zap\u00ednaj\u00fa sa predvolene re\u017eimy \u201euse strict\u201c a \u201euse warnings\u201c a vyp\u00edna sa podpora zastaranej nepriamej not\u00e1cie volania objektov (ke\u010f sa namiesto \u201e->\u201c pou\u017e\u00edva mezera) a viacrozmern\u00fdch pol\u00ed a ha\u0161iakov v \u0161t\u00fdle Perl 4 (\u201e$hash{1, 2}\u201c). <\/p>\n

Ke\u010f sa akumuluje dostatok zmien, namiesto \u010fal\u0161ej verzie Perl 5.x sa vytvor\u00ed verzia Perl 7.0, ktor\u00e1 bude ak\u00fdmsi poh\u013eadom na stav, no zostane \u00faplne sp\u00e4tne kompatibiln\u00e1 s Perl 5. Pre zahrnutie nekompatibiln\u00fdch zmien a nastaven\u00ed bude potrebn\u00e9 jasne prida\u0165 do k\u00f3du pragmu \u201euse v7\u201c. T.j. k\u00f3d s pragmou \u201euse v7\u201c mo\u017eno ch\u00e1pa\u0165 ako \u201emodern\u00fd Perl\u201c, v ktorom s\u00fa dostupn\u00e9 nekompatibiln\u00e9 zmeny jazyka, a bez \u2014 \u201ekonzervat\u00edvny Perl\u201c, ktor\u00fd zostane plne sp\u00e4tne kompatibiln\u00fd s predch\u00e1dzaj\u00facimi vydaniami.
\n
Zdroj: opennet.ru<\/a> <\/p>","protected":false,"gt_translate_keys":[{"key":"rendered","format":"html"}]},"excerpt":{"rendered":"

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