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Add default plural rules

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This makes the PO loader correctly handle the situation where the optional
`Plural-Forms` header field does not exist.

The `Translation` class and its subclasses always have access to valid plural
rules via `_get_plural_rules()`. Plural rules are prioritized:

1. `Translation.plural_rules_override`
2. `TranslationServer.get_plural_rules(locale)`
3. The English plural rules: `nplurals=2; plurals=(n != 1)`

Co-Authored-By: Pāvels Nadtočajevs <7645683+bruvzg@users.noreply.github.com>
This commit is contained in:
Haoyu Qiu
2025-07-21 17:59:14 +08:00
parent ebb96e2303
commit e882e42e1b
11 changed files with 202 additions and 61 deletions
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4
doc/classes/Translation.xml
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@@ -102,5 +102,9 @@
<member name="locale" type="String" setter="set_locale" getter="get_locale" default="&quot;en&quot;">
The locale of the translation.
</member>
<member name="plural_rules_override" type="String" setter="set_plural_rules_override" getter="get_plural_rules_override" default="&quot;&quot;">
The plural rules string to enforce. See [url=https://www.gnu.org/software/gettext/manual/html_node/Plural-forms.html]GNU gettext[/url] for examples and more info.
If empty or invalid, default plural rules from [method TranslationServer.get_plural_rules] are used. The English plural rules are used as a fallback.
</member>
</members>
</class>