Libfyaml – Proper, compliant, maintained(ish) YAML parsing library

4 months ago 17

Fork me on github:
yaml-test-suite
All test cases and expected event/JSON output yaml-test-matrix
Code to run tests for all supported processors and create matrix HTML yaml-runtimes
Code to create Docker image for all supported processors

This Matrix combines all tests from yaml-test-suite and all processors from yaml-runtimes.

The YAML Test Suite currently targets YAML Version 1.2. Note that this list is not meant as a "Best Of" list, as some processors implement 1.1 or 1.0 only, and the test suite contains a lot of edge cases that don't play such an important role in real world examples. It is suited to identify which problems each processors has and what to avoid.

Valid (308)Invalid (94) Total (402) Processors ok n/i diff error n/a pass fail pass failevent - Compare parsing events c-libfyaml-event c-libyaml-event cpp-rapidyaml-event cpp-yamlcpp-event dotnet-yamldotnet-event hs-hsyaml-event js-yaml-event nim-nimyaml-event perl-pp-event perl-refparser-event py-pyyaml-event py-ruamel-event rust-yamlrust-event json - Compare loaded data with JSON c-libfyaml-json dotnet-yamldotnet-json go-yaml-json hs-hsyaml-json js-jsyaml-json js-yaml-json lua-lyaml-json perl-pp-json perl-pplibyaml-json perl-syck-json perl-tiny-json perl-xs-json perl-yaml-json py-pyyaml-json py-ruamel-json ruby-psych-json

C libfyaml	308					94		402
C libyaml	252	9	5	42		78	16	330	72
C++ rapidyaml	274		26	8		32	62	306	96
C++ yaml-cpp	278		15	15		60	34	338	64
C# YamlDotNet	293		5	10		83	11	376	26
Haskell HsYAML	298		1	9		94		392	10
Javascript yaml	307	1				92	2	399	3
Nim NimYAML	302		1	5		76	18	378	24
Perl YAML::PP	300			8		90	4	390	12
Perl Generated RefParser	308					94		402
Python PyYAML	249	9	5	45		80	14	329	73
Python ruamel.yaml	265		6	37		80	14	345	57
Rust yaml	251		28	29		66	28	317	85
C libfyaml	278		1		29	94		372	1
C# YamlDotNet	173	16	60	30	29	84	10	257	116
Go go-yaml	224		6	49	29	79	15	303	70
Haskell HsYAML	269		1	9	29	94		363	10
Javascript js-yaml	224	12	24	19	29	82	12	306	67
Javascript yaml	276		3		29	92	2	368	5
Lua lyaml	210		29	40	29	78	16	288	85
Perl YAML::PP	277			2	29	90	4	367	6
Perl YAML::PP::LibYAML	234		5	40	29	78	16	312	61
Perl YAML::Syck	166		77	36	29	42	52	208	165
Perl YAML::Tiny	44	104	41	90	29	80	14	124	249
Perl YAML::XS (libyaml)	220	8	5	46	29	79	15	299	74
Perl YAML.pm	98		15	166	29	79	15	177	196
Python PyYAML	222		8	49	29	80	14	302	71
Python ruamel.yaml	234		6	39	29	80	14	314	59
Ruby psych	226		12	41	29	78	16	304	69

Generated with yaml-test-suite/data Commit 6e6c296a 2022-01-17 Regenerated data from main v2022-01-17

Legend

Columns

eventsjson

ok	Events matched
n/i	This feature is not implemented in this library
diff	Event output differs
error	Parsing was aborted with an error
n/a	No data to compare for this test
invalid_correct	Input was correctly detected as invalid
invalid_incorrect	Input was accepted although it is invalid
ok	Loaded data is equal to JSON
n/i	This feature is not implemented in this library
diff	Loaded data differs
error	Parsing/Loading was aborted with an error
n/a	No data to compare for this test
invalid_correct	Input was correctly detected as invalid
invalid_incorrect	Input was accepted although it is invalid

Which processors don't implement which features?

--- c-libyaml.event: [ empty-key ] dotnet-yamldotnet.json: [ local-tag, unknown-tag ] java-snakeyaml.event: [ empty-key ] java-snakeyaml.json: [ empty-key, local-tag, unknown-tag ] js-jsyaml.json: [ local-tag, unknown-tag ] js-yaml.event: [ duplicate-key ] lua-lyaml-json: [ empty-key ] perl-pplibyaml.event: [ empty-key ] perl-pplibyaml.json: [ empty-key ] perl-pplibyaml.perl: [ empty-key ] perl-tiny.json: &tiny [ alias, anchor, complex-key, empty-key, explicit-key, flow, tag ] perl-tiny.perl: *tiny perl-xs.json: [ empty-key, unknown-tag ] perl-xs.perl: [ empty-key, unknown-tag ] py-pyyaml.event: [ empty-key ] py-pyyaml.json: [ empty-key ] py-pyyaml.py: [ empty-key ]

Read Entire Article