A much faster, non-compliant YAML parser in (Typed) Racket.
Benchmark file: femboy_music_FRAGILE.yaml (105k lines; 2.9 MB) (source)
| Language | Program | Speed-down @ Time |
|---|---|---|
| JavaScript | js-yaml | 1x @ 180 ms |
| Racket | microyaml strings | 2x @ 370 ms |
| Racket | microyaml types | 3x @ 481 ms |
| .NET | YamlDotNet | 6x @ 1177 ms |
| Python | yaml | 35x @ 6.4 s |
| Racket | yaml | 23,500x @ 1h 10m 33s |
Benchmark file: saltern.yaml (38k lines; 719 kB) (source lightly edited)
| Language | Program | Speed-down @ Time |
|---|---|---|
| Racket | microyaml types | 1x @ 209 ms |
| .NET | YamlDotNet | 4x @ 795 ms |
| Racket | yaml | 2,124x @ 7m 15s |
| Racket | microyaml strings | in strings mode, found explicit hash key [...] which is not a string |
| JavaScript | js-yaml | YAMLException: duplicated mapping key at 349:8 [...] |
| Python | yaml | ConstructorError: while constructing a mapping, found unhashable key |
- Inline values (strings, numbers, booleans)
- Multi-line sequences
- Multi-line mappings
- Explicit mappings
- Nesting
- Comments
- UTF-8
- List marker immediately followed by indentation
- Inline sequences (square brackets notation)
- Inline mappings (curly braces notation)
- Multi-line strings (whether arrow, pipe, implicit, or quoted notation)
- Document markers (triple dash/triple dot notation)
- Tags (exclamation mark notation)
- Anchor nodes (ampersand notation)
- Alias nodes (asterisk notation)
- Directives (percent notation)
- Escape sequences (backslash notation)
- Serialisation
Install from package server: raco pkg install microyaml
Install from local directory: raco pkg install && raco setup --doc-index --only microyaml
Install first. Then: raco doc microyaml