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logos

maciejhirsz / logos

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Subpatterns within subpatterns

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ExoticMatter
ExoticMatter commented Jun 13, 2020

It would be nice if subpatterns could be used within subpatterns.

#[derive(Logos, Copy, Clone, Debug)]
#[logos(subpattern a = r"[a-zA-Z!$%&*/:<=>?^_~]")]
#[logos(subpattern b = r"(?&a)|[0-9+\-.@]")]
pub enum Token {
    #[error]
    Error,
    // ...
}

Currently, this is not supported and causes a regex parse error.

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enhancement good first issue nice to have
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Genivia / RE-flex

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The regex-centric, fast lexical analyzer generator for C++ with full Unicode support. Faster than Flex. Accepts Flex specifications. Generates reusable source code that is easy to understand. Introduces indent/dedent anchors, lazy quantifiers, functions for lex/syntax error reporting, and more. Seamlessly integrates with Bison and other parsers.

bison flex compiler regex regular-expression fuzzy-matching lex pcre lexer lexer-generator regex-pattern regular-expressions graphviz-dot lexical-analyzer regex-library regex-engine flex-regex
  • Updated Oct 24, 2020
  • C++

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