{"id":120643,"date":"2024-11-21T01:09:45","date_gmt":"2024-11-20T23:09:45","guid":{"rendered":"https:\/\/prohoster.info\/blog\/novosti-interneta\/re2c-4-0"},"modified":"2024-11-21T01:09:45","modified_gmt":"2024-11-20T23:09:45","slug":"re2c-4-0","status":"publish","type":"post","link":"https:\/\/prohoster.info\/fr\/blog\/news\/re2c-4-0","title":{"rendered":"re2c 4.0","gt_translate_keys":[{"key":"rendered","format":"text"}]},"content":{"rendered":"

<\/p>\n

Mardi 19 novembre, le lancement a \u00e9t\u00e9 pr\u00e9sent\u00e9 re2c<\/a> \u2013 g\u00e9n\u00e9rateur d'analyseurs lexicaux (aussi appel\u00e9 compilateur d'expressions r\u00e9guli\u00e8res en code dans le langage de programmation cible). re2c se sp\u00e9cialise dans la g\u00e9n\u00e9ration de lexers rapides et facilement int\u00e9grables. Il se distingue de l'analogue plus connu flex par une interface flexible, la g\u00e9n\u00e9ration de lexers optimis\u00e9s sans table et le support d'extractions de sous-correspondances bas\u00e9es sur des automates finis d\u00e9terministes avec des \u00e9tiquettes (TDFA<\/a>). re2c est utilis\u00e9 dans des projets o\u00f9 la vitesse de l'analyseur est essentielle, par exemple dans Ninja et PHP.<\/p>\n

<\/noindex><\/noindex> <\/p>\n

Dans la version 4.0, le sous-syst\u00e8me de g\u00e9n\u00e9ration de code a \u00e9t\u00e9 enti\u00e8rement repens\u00e9, ce qui a permis d'ajouter le support de huit nouveaux langages (D, Haskell, Java, JavaScript, OCaml, Python, V, Zig) en plus de ceux d\u00e9j\u00e0 pris en charge (C\/C++, Go, Rust), ainsi qu'un m\u00e9canisme g\u00e9n\u00e9ral pour ajouter de nouveaux langages via des fichiers de configuration. Le g\u00e9n\u00e9rateur de code est responsable de la traduction de l'automate fini d\u00e9j\u00e0 construit et optimis\u00e9 en code, c'est-\u00e0-dire que sa t\u00e2che est de choisir les constructions de contr\u00f4le appropri\u00e9es pour le langage cible, les types de donn\u00e9es, le mod\u00e8le g\u00e9n\u00e9ral du programme, etc. Auparavant, toute cette logique faisait partie du code source de re2c, et pour la modifier ou ajouter un nouveau langage, il fallait patcher le code source et recompiler re2c. De tels patchs n'\u00e9taient pas accept\u00e9s dans le r\u00e9f\u00e9rentiel principal sans mise en \u0153uvre d'un ensemble standard d'exemples et de tests, ce qui compliquait encore le processus. Maintenant, toute cette logique a \u00e9t\u00e9 transf\u00e9r\u00e9e dans des fichiers syntaxiques<\/a> \u2013 fichiers de configuration texte qui peuvent \u00eatre fournis par l'utilisateur (par d\u00e9faut, re2c utilise ceux standards). Le code source de re2c est totalement d\u00e9pourvu de d\u00e9tails de langage sp\u00e9cifique et se base uniquement sur le fichier syntaxique. L'utilisateur peut partiellement red\u00e9finir le fichier syntaxique existant ou en \u00e9crire un nouveau depuis le d\u00e9but. Pour tous les langages officiellement support\u00e9s, il y a une documentation compl\u00e8te avec des exemples<\/a>.<\/p>\n

<\/noindex> <\/p>\n

D'ailleurs, l'id\u00e9e m\u00eame des fichiers syntaxiques est n\u00e9e gr\u00e2ce \u00e0 un commentaire sur LOR<\/a>, merci \u00e0 \"re2cthe_coder<\/a>.<\/p>\n

<\/noindex> <\/p>\n

La version comprend de nombreux autres changements pour simplifier l'interface utilisateur, am\u00e9liorer le fonctionnement avec les groupes de capture, et un environnement en ligne pour \u00e9diter et compiler des exemples a \u00e9galement \u00e9t\u00e9 ajout\u00e9 : http:\/\/re2c.org\/playground<\/a>.<\/p>\n

<\/noindex><\/p>\n

Source : linux.org.ru<\/a><\/p>","protected":false,"gt_translate_keys":[{"key":"rendered","format":"html"}]},"excerpt":{"rendered":"

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