R Observatory: Metrics for yaml12 version 0.2.0

Balamuta, James Joseph

doi:10.5281/zenodo.21843040

yaml12

0.2.0Package record

Fast 'YAML' 1.2 Parser and Formatter

2packages dependsuggested by 1

11.4Kdownloads / year

–test coverage

13/13flavors OK

Overview

About

Maintained by Tomasz KalinowskiCRAN page ↗GitHub ↗Website ↗Issues ↗Declared funder: Posit Software, PBC

A fast, correct, safe, and ergonomic 'YAML' 1.2 parser and generator written in 'Rust'. Convert between 'YAML' and simple 'R' objects with full support for multi-document streams, tags, anchors, and aliases. Offers opt-in handlers for custom tag behavior and round-trips common 'R' data structures. Implements the 'YAML' 1.2.2 specification from the 'YAML' Language Development Team (2021) https://yaml.org/spec/1.2.2/. Proudly supported by Posit.

Changes in 0.2.0

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).

Show all changes in 0.2.0Hide the rest of the changes in 0.2.0

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).

From NEWS.md in the release

Install

R (CRAN)pak (dev)Ubuntu (r2u)Fedora (COPR)

install.packages("yaml12", repos = "https://cloud.r-project.org/")

Installs the current CRAN release. Prebuilt binaries on Windows and macOS.

if (!requireNamespace("pak", quietly = TRUE))
  install.packages("pak", repos = "https://cloud.r-project.org/")
pak::pak("posit-dev/r-yaml12")

Development version from posit-dev/r-yaml12. Installs pak first if it is not already available.

Release

# enable cranapt (r2u) if it is not already set up, then install
grep -rqs r2u.stat.illinois.edu /etc/apt/sources.list /etc/apt/sources.list.d/ \
  || curl -fsSL https://raw.githubusercontent.com/eddelbuettel/r2u/master/inst/scripts/add_cranapt_noble.sh | sudo bash
sudo apt install -y r-cran-yaml12

Fast Ubuntu binaries via r2u (no compilation). The cranapt setup runs once and is skipped when it is already enabled. We list this channel from recorded r2u download activity rather than from a live index of the repository, so treat it as last known rather than guaranteed.

bspm (used by r2u) also needs make: sudo apt install make

# enable the iucar/cran COPR if it is not already present, then install
ls /etc/yum.repos.d/*iucar*cran*.repo >/dev/null 2>&1 \
  || sudo dnf copr enable -y iucar/cran
sudo dnf install -y R-CRAN-yaml12

RPMs from the iucar/cran COPR, rebuilt from CRAN.

For install.packages() integration in R, also: sudo dnf install R-CoprManager

Health

CRAN checks

13OK

CRAN check page ↗

Slowest check: 6.7 min · r-release-macos-x86_64

Status changes

OK13 OK2026-08-04
NOTE12 OK, 1 NOTE2026-08-01
OK13 OK2026-07-30
NOTE12 OK, 1 NOTE2026-07-29
OK13 OK2026-05-02

Show 4 earlier changesHide 4 earlier changes

NOTE11 OK, 1 NOTE2026-04-25
OK14 OK2026-04-16
NOTE13 OK, 1 NOTE2026-03-28
OK14 OK2026-03-10

Advisories

none known

How this is measured·How advisories are found

Documentation

In release 0.2.0

READMEYes · 284 wordsVignettesYes · 2 · dynamicNEWSYes · 100% structured · mentions 0.2.0Citation fileNoWebsiteYes · pkgdown

The repository also keeps web-only articles.

Help pages: 2
Examples that run: 100%2 run in a plain check
Exported functions with examples: 100%
Documented parameters: 100%
Return-value docs: 100%
Help pages citing references: 0%

Vignettes (2)

How these are measured

Downloads

11.4K

CRAN downloads in the past year

Rank #2,936 · ~31/day · ~951/mo

Releases R versions

Daily download trend is not available in this view yet.

1.8K30 days

4.8K90 days

11.4K1 year

Compare downloads with other packages →

Also on623 r2u

How downloads are counted

Repository

posit-dev/r-yaml12 ↗Organization: posit-dev

27Stars

1Forks

3Open issues

0Open PRs

2Releases

187Commits

2Commit identities

187 commits · Last activity 2026-08-26 · +8% stars, 30d · Default branch at 0.2.0.9000, ahead of CRAN 0.2.0 (checked 2026-10-11)

Responsiveness

How these are sampled

PRs merged (all time): 100%
Median days to close, 50 most recently updated closed issues: 56
Median days to close, 50 most recently updated closed PRs: 0

Stars over time

2025-11-25 · 12026-10-12 · 27

How these are measured

PracticesBeta

8 development-tooling and community-health practices detected across 4 families in the upstream repository

Checks run against github.com/posit-dev/r-yaml12 on 2026-10-11.

Continuous integration (2)

GitHub ActionsR CMD check workflow

The R CMD check workflow runs on Linux, macOS and Windows, and on R-devel

Docs source (4)

README.Rmdpkgdown

GitHub Pages site last deployed 2026-08-26 · The repository has a site deploy workflow

pkgdown site last built 2026-08-25

CRAN release process (1)

cran-comments.md

Lint, format, editor (1)

RStudio project

How this is detected·Detection ruleset v3 (2026-09-26)

AI coding toolsBeta

An outside contributor's pull request to this repository was written with an AI coding tool.

From outside contributors

Claude Code
Pull requests: 1 from outside contributors, first on 2026-07-07, 1 from forks

How this is detected·Detection ruleset v4 (updated 2026-09-27)

Dependencies

Declared dependencies

6 external dependencies (excludes base and recommended)

Installing yaml12 adds no packages beyond those that come with R.

Depends (1)

R >= 4.2

Imports (0)

none

LinkingTo (0)

none

Suggests (6)

jsonlite knitr rmarkdown testthat waldo withr

Enhances (0)

none

Dependency license breakdown →

Reverse dependencies

2direct

1indirect

Imports 2

Suggested by 1

Depends, Imports or LinkingTo, most downloaded first

frontmatter Rapp

Suggests, most downloaded first

dataquieR

How these are counted

Code & Tests

People & History

People (3)

Tomasz Kalinowski

Author, Maintainer since 0.1.0 (2025)

Authors of the dependency Rust crates

Copyright holder

See inst/AUTHORS and LICENSE.note for vendored Rust dependency authors and licenses.

Posit Software, PBC

Copyright holder, Funder

Releases (2)

Pick two releases to compare their code metrics.

0.2.0Latest
record
2026-08-25 · current release · diff ↗
R
R 4.6.0 released · 2026-04-24
0.1.0
record
2025-12-11
R
R 4.5.0 released · 2025-04-11

Package metadata

First published: 2025-12-11
Total releases: 2 / 1 yrs
License: MIT + file LICENSE OSI
Minimum R: ≥ 4.2
Download size: 1.6 MB

Cite

Cite this package

Run in R for the authors' preferred citation:

citation("yaml12")

Format

Kalinowski, T., Authors of the dependency Rust crates, & Posit Software, PBC. (2026). yaml12: Fast 'YAML' 1.2 Parser and Formatter (Version 0.2.0) [Computer software]. https://doi.org/10.32614/CRAN.package.yaml12

This package has no citation file, so citation() returns this entry built from DESCRIPTION.

Cite the R Observatory

For a number measured here: a download total, a coverage figure, an archival date.

Format

APA

Balamuta, J. J. (2026). R Observatory: Metrics for yaml12 version 0.2.0 [Data set]. HJJB, LLC. Data release v2026-10-18. https://doi.org/10.5281/zenodo.21843040

From data release v2026-10-18, which the citation names so these numbers can be found later. More on citing and the projects behind them.

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