The parser now accepts and ignores reserved directives such as
%*** and treats indented --- text as part of a
multiline plain scalar.
parse_yaml() and read_yaml() now
preserve tags in the tag:yaml.org,2002: namespace that are
not converted to built-in R values as a yaml_tag
attribute.
parse_yaml() now invokes mapping-key handlers once
per key.
write_yaml() no longer adds optional document end
(...) markers. Written documents still begin with
--- and end with a newline.
format_yaml() and write_yaml() now emit
Inf, -Inf, and NaN as
.Inf, -.Inf, and .NaN so they
round-trip as doubles (#9).
write_yaml() gains an append argument
for adding YAML documents to existing files (#4).
Replaced the Rust-side R API layer with
savvy/savvy-ffi bindings. Source installs now
require rustc 1.71 or newer. Vendored Rust crate attribution now points
to crate repository metadata when Cargo does not provide crate
authors.
format_yaml() and write_yaml() now emit
whole-valued doubles with a decimal suffix (for example,
100.0 instead of 100), so parsing the result
preserves their R double type.
format_yaml() and write_yaml() now
automatically wrap long single-line strings and multiline strings
containing unindented, single-line paragraphs separated by exactly one
blank line. Strings with a safe word boundary are emitted as folded
block scalars: >- preserves no final newline, while
> preserves exactly one. Paragraph breaks and all other
string content round-trip through parse_yaml() unchanged.
The new width argument controls the target line width;
width = NULL and width = Inf disable folded
wrapping, mapping keys never use block scalars, and unsafe values use a
lossless fallback. Mapping keys longer than YAML’s implicit-key limit
use explicit mapping syntax.
Multiline literal blocks now use explicit indentation indicators to preserve leading spaces or tabs. They keep physical blank lines empty and preserve later-indented lines. Root literal content is indented so document markers inside a string cannot end the scalar.
format_yaml() and write_yaml() now
quote strings only when YAML 1.2 requires it. Strings such as
"yes", "don't", "a,b",
"f[0]", or ".gitignore" are emitted as plain
scalars (YAML 1.2 has no legacy
yes/no/on/off
booleans, and indicator characters only need quoting in positions where
they are ambiguous). Strings the YAML 1.2 core schema would read back as
null, boolean, or a number (e.g. "true",
"0x1F", "0o17", ".inf") are still
quoted, as are structurally unsafe ones (leading indicators,
": ", " #", leading/trailing white space, or
document-marker prefixes).
read_yaml() and write_yaml() now expand
tilde prefixes (~) in path, as by
path.expand() (#7).
Fixed source installs on Windows ARM64 by selecting the
aarch64-pc-windows-gnullvm Rust target. Windows source
installs now also fail early with instructions if the required Rust
target is not installed. The README documents that Windows ARM64 source
installs also require Microsoft C++ Build Tools with ARM64
components.
Added a benchmarks article comparing read/write performance
against the yaml package (#2).