icu_provider_fs

icu_provider_fs is one of the ICU4X components.

It reads ICU4X data files from the filesystem in a given directory.

Examples

use icu_provider_fs::FsDataProvider;

let provider = FsDataProvider::try_new("/path/to/data/directory".into())
    .expect_err("Specify a real directory in the line above");

Directory Structure

The ICU4X data directory has a file named manifest.json at the root, and a nested structure with a data marker (DataMarkerInfo), and locale (DataLocale) as the leaf data files. For example, Arabic JSON data for cardinal plural rules lives at plurals/cardinal@1/ar.json.

The exact form of the directory structure may change over time. ICU4X uses metadata from manifest.json to dynamically interpret different versions of the directory structure.

├── manifest.json
├── dates
│   └── gregory@1
│       ├── ar-EG.json
│       ├── ar.json
│       ├── be.json
│       ⋮
│       └── und.json
└── plurals
    ├── cardinal@1
    │   ├── ar.json
    │   ├── be.json
    │   ⋮
    │   └── und.json
    └── ordinal@1
        ├── ar.json
        ├── be.json
        ⋮
        └── und.json

Resource Formats

ICU4X data can be stored in different formats. At the moment there are:

• JSON - Textual format, easy to read
• Postcard - Binary, small #[no_std] resource format
• Bincode - Binary, fast resource format

The directory passed to the FsDataProvider constructor may contain either of them.

Notice: In order for ICU4X to be able to deserialize the returned data, the corresponding Cargo feature has to be activated on the icu_provider crate. See AsDeserializingBufferProvider::as_deserializing.

Exporting data

To generate the data required for FsDataProvider, run the following:

icu4x-datagen --markers all --locales full --format fs

To export postcard format, use

icu4x-datagen --markers all --locales full --format fs --syntax postcard

More Information

For more information on development, authorship, contributing etc. please visit ICU4X home page.