3.0.0

A hand-written single-pass parser replaces Racc, and TOML 1.1 is now the default. Parsing executes 2.2-2.5x fewer instructions than perfect_toml and 12-14x fewer than 2.0.4. No runtime dependencies; Ruby 3.3 or later.

Breaking changes:

• Require Ruby 3.3 or later
• Read documents as TOML 1.1 by default. Every valid TOML 1.0 document parses unchanged; 1.1 additionally accepts \e and \xHH escapes, times without seconds, and inline tables that span lines, contain comments or end with a comma. version: "1.0" keeps rejecting those
• Fractional seconds are exact Rationals instead of Floats: Time, LocalDateTime and LocalTime values carry 56.123, not 56.122999…
• Remove Tomlrb::Scanner, Tomlrb::Handler, Tomlrb::StringUtils, Tomlrb::GeneratedParser, Tomlrb::Keys and Tomlrb::Key; Tomlrb::Parser.new now takes the document string. Key redefinitions raise Tomlrb::ParseError as before
• require "tomlrb" no longer loads time and stringio

Features:

• TOML 1.1 support, selected with version: "1.1" (default) or "1.0"

Security:

• Nesting depth of arrays and inline tables is limited only by memory: they are parsed with an explicit stack

Performance:

• Replace the Racc grammar with a hand-written single-pass parser; Racc is no longer used. Parsing executes 2.2-2.5x fewer instructions than perfect_toml 0.9.1 and 12-14x fewer than 2.0.4 (2.6-2.9x and 14-16x with YJIT)
• Multi-line strings are scanned by searching for the closing quotes, a backslash or a control character: a 1 MB """ or ''' string parses 25x faster, peak memory no longer grows by about 48 MB per MB of string, and quote-dense content (ab"cd""ef) no longer costs a step per quote

Conformance (every TOML 1.0 and 1.1 case of toml-test 2.2.0 passes):

• An escaped backslash right before a closing """ ("""x\\""") ends the string
• Reject a carriage return not followed by a line feed in multi-line strings, and trim a CRLF (not just LF) right after an opening """ or '''
• Parse bare keys that start with true, false, inf or nan (trueval, inf-x) or look like dates and numbers (1979-05-27a, 0x1f, [[1e5]]), and reject keys containing :
• Reject empty values in inline tables ({a = }), inline tables that are not assigned to a key, and dotted keys that extend an inline table
• Reject spaced array-of-tables brackets ([ [a]], [[a] ]) on indented and CRLF lines too, and stop rejecting multi-line arrays whose line starts with [ [
• Separate date and time only with T, t or a space, accept an offset only after a time, and reject negative years and days that do not exist (1979-06-31T00:00:00-00:00)
• Reject floats with leading zeros (01e5) and accept underscores in exponents (1e1_0)

Other:

• Parse errors report the line and column (in characters)
• benchmarks/matrix.rb measures time, allocations and peak memory over a set of generated workloads; benchmarks/bench.rb accepts several files
• LocalDate, LocalDateTime and LocalTime validate their fields arithmetically and build their Time on first use
• Ship RBS type signatures in sig/

Full changelog: v2.0.5...v3.0.0