Release 2022.12.0

[foonathan]

Headline: Unicode 15 support, ability to split a grammar into multiple translation units using lexy::dsl::subgrammar, and significant performance improvements.

Potential breaking changes

• Change [lexy::dsl::peek_not() error recovery behavior:
  it will now consume the input it matched to recover, which is more useful.
• Remove Production parameter from lexy::error_context.
  It is replaced by a type-erased lexy::production_info.
• lexy::validate, lexy::parse, and lexy::parse_as_tree now type-erase generic error tags prior to invoking the callback.
• Use type-erased lexy::production_info instead of Production type in lexy::parse_tree.
  This is technically a breaking change, as it may affect overload resolution.

New features

• Update Unicode database to Unicode 15.
• Use SWAR (SIMD within a register) techniques to optimize token parsing.
• Add lexy::dsl::subgrammar to split a grammar into multiple translation units.
• Add lexy::dsl::flags and lexy::dsl::flag to parse enum flags.
• Add overload of lexy::dsl::position that parses a rule.
  This allows using it as branch conditions.
• Add lexy::dsl::effect to trigger side-effects during parsing.
• Add lexy::subexpression_production to parse a subexpression.
• Add lexy::utf8_char_encoding.
• Add lexy::parse_tree::remaining_input() and populate it by lexy::parse_as_tree.
• Add lexy::make_buffer_from_input function.
• Add type-erased version of lexy::error.
• Support non-const parse state.

Bugfixes

• Fix bug where lexy::bind callback does not forward rvalue arguments; they got turned into lvalues instead.
• Fix bug where callback composition was not allowed if the final callback returns void.
• Fix bug where dsl::quoted(cc.error<foo>) did not use foo as the error.

New Contributors

• @Xottab-DUTY made their first contribution in Fixed typo in LEXY_KEYWORD documentation #92

Full Changelog: v2022.05.1...v2022.12.0

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This discussion was created from the release Release 2022.12.0.