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https://github.com/processone/fast_yaml
Fast YAML native library for Erlang / Elixir
https://github.com/processone/fast_yaml
erlang libyaml libyaml-library yaml
Last synced: 10 days ago
JSON representation
Fast YAML native library for Erlang / Elixir
- Host: GitHub
- URL: https://github.com/processone/fast_yaml
- Owner: processone
- License: apache-2.0
- Created: 2015-12-11T15:40:11.000Z (almost 9 years ago)
- Default Branch: master
- Last Pushed: 2024-06-27T09:06:48.000Z (4 months ago)
- Last Synced: 2024-10-12T04:22:21.805Z (28 days ago)
- Topics: erlang, libyaml, libyaml-library, yaml
- Language: Erlang
- Homepage: http://ejabberd.im
- Size: 338 KB
- Stars: 51
- Watchers: 13
- Forks: 19
- Open Issues: 2
-
Metadata Files:
- Readme: README.md
- Changelog: CHANGELOG.md
- Contributing: CONTRIBUTING.md
- License: LICENSE.txt
- Code of conduct: CODE_OF_CONDUCT.md
Awesome Lists containing this project
- freaking_awesome_elixir - Erlang - Fast YAML is an Erlang wrapper for libyaml "C" library. (YAML)
- fucking-awesome-elixir - fast_yaml - Fast YAML is an Erlang wrapper for libyaml "C" library. (YAML)
- awesome-elixir - fast_yaml - Fast YAML is an Erlang wrapper for libyaml "C" library. (YAML)
README
# Fast YAML
[](https://github.com/processone/fast_yaml/actions/workflows/ci.yml)
[](https://coveralls.io/github/processone/fast_yaml?branch=master)
[](https://hex.pm/packages/fast_yaml)
Fast YAML is an Erlang wrapper for
[libyaml](http://pyyaml.org/wiki/LibYAML) "C" library.
It is designed to be fast and efficient.
## Installation
### Dependencies
Fast YAML depends on native LibYaml library. You need development
headers for LibYaml library to build it.
The minimum required Erlang/OTP version is 18.0
### Generic build
You can trigger build with:
./configure && make
### OSX build example
You can install LibYaml and with Homebrew:
brew install libyaml
You can then export environment variable to use LibYaml as installed
by Homebrew, before issuing compilation commands:
export LDFLAGS="-L/usr/local/lib"
export CFLAGS="-I/usr/local/include"
export CPPFLAGS="-I/usr/local/include"
./configure && make
## Example usage
```erlang
erl -pa ebin -pa deps/*/ebin
Erlang/OTP 18 [erts-7.1] [source] [64-bit] [smp:4:4] [async-threads:10] [hipe] [kernel-poll:false] [dtrace]
Eshell V7.1 (abort with ^G)
1> application:start(fast_yaml).
ok
2> fast_yaml:decode(<<"a: 1\nb: -3.0">>).
{ok,[[{<<"a">>,1},{<<"b">>,-3.0}]]}
```
## Option `plain_as_atom`
Converts all unquoted YAML values to atoms
```erlang
3> fast_yaml:decode(<<"a: 1\nb: -3.0">>, [{plain_as_atom, true}]).
{ok,[[{a,1},{b,-3.0}]]}
4> fast_yaml:decode(<<"a: b\nc">>).
{error,{scanner_error,<<"could not find expected ':'">>,2,
0}}.
5> fast_yaml:decode_from_file("test/test2.yml", [plain_as_atom]).
{ok,[[[{step,[{instrument,<<"Lasik 2000">>},
{pulseEnergy,5.4},
{pulseDuration,12},
{repetition,1000},
{spotSize,<<"1mm">>}]}],
[{step,[{instrument,<<"Lasik 2000">>},
{pulseEnergy,5.0},
{pulseDuration,10},
{repetition,500},
{spotSize,<<"2mm">>}]}],
[{step,<<"id001">>}],
[{step,<<"id002">>}],
[{step,<<"id001">>}],
[{step,<<"id002">>}]]]}
```
## Option `sane_scalars`
Converts the following scalar values to their Erlang-native data type:
`"null"` → `undefined`
`"true"` → `true`
`"false"` → `false`
Integer and float values also get converted. All other scalar values
stay binaries. Key in mappings also stay binary and never get coerced
into int / float / atom .
An unquoted mapping value that is an empty string gets converted into
`undefined`. (e.g. the string `"foo:"` decodes as `[{<<"foo">>, undefined}]`)
## Option `maps`
Convert YAML mappings into Erlang maps.
```erlang
7> fast_yaml:decode(<<"a: true\nb: -3.0\nc: string">>, [{maps, true}]).
{ok, [#{"a" => "true", "b" => -3.0, "c" => "string"}]}
```
> For compatibility with the `yamerl` and `YamlElixir` libraries, use the `[sane_scalars, maps]` options.
## Development
### Test
#### Unit test
You can run eunit test with the command:
make test