{"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\/pt\/blog\/news\/re2c-4-0","title":{"rendered":"re2c 4.0","gt_translate_keys":[{"key":"rendered","format":"text"}]},"content":{"rendered":"

<\/p>\n

Na ter\u00e7a-feira, 19 de novembro, foi lan\u00e7ado re2c<\/a> – gerador de analisadores l\u00e9xicos (tamb\u00e9m conhecido como compilador de express\u00f5es regulares para c\u00f3digo na linguagem de programa\u00e7\u00e3o de destino). re2c se especializa na gera\u00e7\u00e3o de lexers r\u00e1pidos e facilmente integr\u00e1veis. Ele se diferencia da vers\u00e3o mais conhecida, o flex, por sua interface flex\u00edvel, gera\u00e7\u00e3o de lexers otimizados sem tabelas e suporte a extra\u00e7\u00f5es de submatch (submatch extraction) baseadas em aut\u00f4matos finitos determin\u00edsticos com tags (TDFA<\/a>). O re2c \u00e9 utilizado em projetos onde a velocidade do l\u00e9xico \u00e9 crucial, como no Ninja e no PHP.<\/p>\n

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

Na vers\u00e3o 4.0, o subsistema de gera\u00e7\u00e3o de c\u00f3digo foi completamente refeito, permitindo a adi\u00e7\u00e3o de suporte a oito novas linguagens (D, Haskell, Java, JavaScript, OCaml, Python, V, Zig) al\u00e9m das j\u00e1 suportadas (C\/C++, Go, Rust), assim como um mecanismo geral para adicionar novas linguagens atrav\u00e9s de arquivos de configura\u00e7\u00e3o. O gerador de c\u00f3digo \u00e9 respons\u00e1vel por traduzir o aut\u00f4mato finito j\u00e1 constru\u00eddo e otimizado para c\u00f3digo, ou seja, sua tarefa \u00e9 escolher as constru\u00e7\u00f5es de controle, tipos de dados, modelo geral do programa, etc., apropriados para a linguagem de destino. Anteriormente, toda essa l\u00f3gica fazia parte do c\u00f3digo-fonte do re2c, e para alter\u00e1-la ou adicionar uma nova linguagem, era necess\u00e1rio modificar o c\u00f3digo-fonte e recompilar o re2c. Esses patches n\u00e3o eram aceitos no reposit\u00f3rio principal sem a implementa\u00e7\u00e3o de um conjunto padr\u00e3o de exemplos e testes, o que complicava ainda mais todo o processo. Agora, toda essa l\u00f3gica foi transferida para arquivos de sintaxe<\/a> – arquivos de configura\u00e7\u00e3o textuais que podem ser fornecidos pelo usu\u00e1rio (por padr\u00e3o, o re2c utiliza os padr\u00f5es). O c\u00f3digo-fonte do re2c est\u00e1 completamente livre de detalhes de linguagens espec\u00edficas e depende apenas do arquivo sint\u00e1tico. O usu\u00e1rio pode redefinir parcialmente um arquivo sint\u00e1tico existente ou criar um novo do zero. Para todas as linguagens oficialmente suportadas, h\u00e1 documenta\u00e7\u00e3o completa com exemplos<\/a>.<\/p>\n

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

Ali\u00e1s, a pr\u00f3pria ideia de arquivos de sintaxe surgiu gra\u00e7as a um coment\u00e1rio no LOR<\/a>, pelo qual agradecemos \"re2cthe_coder<\/a>.<\/p>\n

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

A vers\u00e3o cont\u00e9m muitas outras mudan\u00e7as para simplificar a interface do usu\u00e1rio, melhorar o trabalho com grupos de captura, e tamb\u00e9m foi adicionada uma plataforma online para editar e compilar exemplos: http:\/\/re2c.org\/playground<\/a>.<\/p>\n

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

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

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\u0434\u0435\u0442\u0435\u0440\u043c\u0438\u043d\u0438\u0440\u043e\u0432\u0430\u043d\u043d\u044b\u0445 \u043a\u043e\u043d\u0435\u0447\u043d\u044b\u0445 \u0430\u0432\u0442\u043e\u043c\u0430\u0442\u043e\u0432 \u0441 […]<\/p>\n","protected":false,"gt_translate_keys":[{"key":"rendered","format":"html"}]},"author":1,"featured_media":120644,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[702],"tags":[],"class_list":["post-120643","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-news"],"aioseo_notices":[],"aioseo_head":"\n\t\t\n\t\n\t\n\t\n\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\n","aioseo_head_json":{"title":"\ud83e\udd47re2c 4.0 | ProHoster","description":"Na ter\u00e7a-feira, 19 de novembro, foi lan\u00e7ado o re2c \u2013 um gerador de analisadores l\u00e9xicos (tamb\u00e9m conhecido como compilador de 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