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nom v0.2.0 Release Notes

Release Date: 2015-03-24 // about 9 years ago

  • works with rustc 1.0.0-dev (81e2396c7 2015-03-19) (built 2015-03-19)

    Thanks

    • Ryman for the AsBytes implementation
    • 📚 jag426 and jaredly for documentation fixes
    • eternaleye on #rust IRC for his help on the new macro syntax

    🔄 Changed

    • the AsBytes trait improves readability, no more b"...", but "..." instead
    • Incomplete will now hold either Needed;;Unknown, or Needed::Size(u32). Matching on Incomplete without caring for the value is done with Incomplete(_), but if more granularity is mandatory, Needed can be matched too
    • 📜 alt! can pass the result of the parser to a closure
    • 0️⃣ the take_* macros changed behaviour, the default case is now not to consume the separator. The macros have been renamed as follows: take_until! -> take_until_and_consume!, take_until_and_leave! -> take_until!, take_until_either_and_leave! -> take_until_either!, take_until_either! -> take_until_either_and_consume!

    ➕ Added

    • peek! macro: matches the future input but does not consume it
    • 📜 length_value! macro: the first argument is a parser returning a n that can cast to usize, then applies the second parser n times. The macro has a variant with a third argument indicating the expected input size for the second parser
    • benchmarks are available at https://github.com/Geal/nom_benchmarks
    • 📚 more documentation
    • 📜 Unnamed parser syntax: warning, this is a breaking change. With this new syntax, the macro combinators do not generate functions anymore, they create blocks. That way, they can be nested, for better readability. The named! macro is provided to create functions from parsers. Please be aware that nesting parsers comes with a small cost of compilation time, negligible in most cases, but can quickly get to the minutes scale if not careful. If this happens, separate your parsers in multiple subfunctions.
    • 👍 named!, closure! and call! macros used to support the unnamed syntax
    • map!, map_opt! and map_res! to combine a parser with a normal function, transforming the input directly, or returning an Option or Result

    🛠 Fixed

    • is_a! is now working properly

    ✂ Removed

    • 🚚 the o! macro does less than chain!, so it has been removed
    • the fold0! and fold1! macros were too complex and awkward to use, the many* combinators will be useful for most uses for now