зеркало из https://github.com/mozilla/gecko-dev.git
53 строки
2.2 KiB
ReStructuredText
53 строки
2.2 KiB
ReStructuredText
#####
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ICU4X
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#####
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This file documents the procedures for building with `ICU4X <https://github.com/unicode-org/icu4x>`__.
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Enabling ICU4X
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==============
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#. Add the ``ac_add_options --enable-icu4x`` mozconfig. (This is the default)
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#. Do a full build.
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Updating the bundled ICU4X data
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===============================
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ICU4X data is bundled directly as a rust crate with ``compiled_data`` feature.
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But each ``icu_*_data`` crate has all locale data, so it might include unnecessary data. ``icu_segmenter`` uses custom crates in Gecko since it includes unnecessary data such as the word dictionaries for East Asian.
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The script ``intl/update-icu4x.sh`` can generate and update this binary data. If you want to add the new data type, you modify this script and then, run it.
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When using ICU4X 1.4.0 data with the latest data that is hard-coded, you have to run the following. The baked data of ``icu_segmenter`` is generated into ``intl/icu_segmenter_data/data``.
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.. code:: bash
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$ cd $(TOPSRCDIR)/intl
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$ ./update-icu4x.sh https://github.com/unicode-org/icu4x.git icu@1.4.0 44.0.0 release-74-1 1.4.0
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Updating ICU4X
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==============
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If you update ICU4X crate into Gecko, you have to check ``Cargo.toml`` in Gecko's root directory. We might have some hacks to replace crate.io version with a custom version.
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C/C++ FFI
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=========
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ICU4X provides ``icu_capi`` crate for C/C++ FFI. ``mozilla::intl::GetDataProvider`` returns ``capi::ICU4XDataProvider`` of ``icu_capi``. It can return valid data until shutting down.
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Accessing the data provider from Rust
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=====================================
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Use ``compiled_data`` feature. You don't consider data provider.
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Adding new ICU4X features to Gecko
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==================================
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To reduce build time and binary size, embedded ICU4X in Gecko is minimal configuration. If you have to add new features, you have to update some files.
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#. Adding the feature to ``icu_capi`` entry in ``js/src/rust/shared/Cargo.toml``.
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#. Modify ``[features]`` section in ``intl/icu_capi/Cargo.toml`` to enable ``compiled_data`` feature of added crate.
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#. Modify the patch file for ``intl/icu_capi/Cargo.toml`` into ``intl/icu4x-patches``.
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#. (Optional) Modify ``intl/update-icu4x.sh`` to add generated ICU4X data if you want to modify ICU4X baked data.
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