Tracking: Stable 1.0

[zesterer]

A list of things that need doing before 1.0 can be released as stable. This list will grow as we become aware of more things or remember outstanding issues.

API

General

• [ ] Consider whether ParserSealed is necessary (perhaps doc(hidden) is sufficient for semver? Should we take a 'it's your fault if you don't read the docs' perspective?)
• [ ] The sync feature is broken. When enabled, it adds extra Send/Sync constraints to trait object parsers like recursive, thereby making it non-additive.
• [ ] Consider IterParser API overhaul from #425
• [ ] Reconsider inclusion of the lexical crate (apparently it has soundness issues and is unmaintained?)
• [ ] Remove SimpleSpan::new in favour of Span::new, which is more general.

Combinators

• [x] Merge map_*, try_map_*, foldl_* and foldr_* combinators into one (see #537).
• [ ] Implement pratt parser combinator
  • [x] Prefix unary
  • [x] Postfix unary
  • [x] Infix binary
  • [ ] Dynamic building of parsers (i.e: accept a Vec<Operator> or something of the sort, see here)
• [ ] Find a solution for leaky recursive (#494 seems like a good candidate)
• [ ] Give the text parsers, such as text::ident a distinct type (instead of returning an impl Parser), allowing us to propagate trait bounds through properly

Inputs

• [ ] Consider implementation of CopyStream (that copies the iterator instead of caching tokens, more performant for iterators with very little state, like logos iterators)
• [ ] Consider naming of Stream: is IterInput more sensible?
• [ ] Should Input::spanned take a 'full input' span rather than an 'end of input' span? Might be more general.

Errors

• [ ] Unify 'expected' and label system (i.e: the former should be a special case of the latter)
• [ ] Ensure that all parsers necessarily provide at least one label (see #504 and https://github.com/zesterer/chumsky/pull/538)
• [ ] Remove RichReason::Many

Extension API

• [x] Initial implementation

Documentation

• [ ] Final pass to check correctness of documentation (some of it is from the 0.9 days)
• [ ] Nail down consistent terminology
  • [ ] 'token' and not 'character'/'element'
  • [ ] 'input' and not 'stream'/'iterator' (except when those terms are correct)
  • [ ] 'fatal' and 'recovered' errors, not 'primary' or 'secondary'

Examples

• [ ] Create a new example for pythonic indentation parsing with the new context-sensitive parsers

Guide

• [ ] Finish writing guide sections
• [ ] Final spellchecking/grammar pass
• [ ] Rewrite tutorial, including demonstration of:
  • [ ] Lexing
  • [ ] Spans
  • [ ] Error recovery

Other work

• [ ] Write migration guide (a good way to go about this might be porting a non-trivial parser and noting the major issues).
• [ ] Collect up all changes into the changelog (it's going to be big!)

[safasofuoglu]

Sad to see lexical being unsound and stale. parse_partial(&[u8]) really makes a performance difference. Can https://github.com/aldanor/fast-float-rust be considered as an alternative?

[zesterer]

I think the parse_partial function from fast-float would work nicely with chumsky, yes (the API is pretty much identical to the one exposed by regex-automata, which we use for the regex parser). As for integer parsing: I'm less certain, although there are less complexities around integer parsing so implementing our own fast integer parser might not be too difficult.

[sshine]

Do I understand correctly that the list of examples not yet ported to 1.0 are those in the examples/ sub-directory that do not have an [[example]] section? Update: My understanding is corrected; for example, foo is updated but does not have an [[example]] section.

[Zij-IT]

Sad to see lexical being unsound and stale. parse_partial(&[u8]) really makes a performance difference. Can https://github.com/aldanor/fast-float-rust be considered as an alternative?

lexical appears to be fixed and the maintainer is back (:

[zesterer]

That's good to know!