ICU-lite MessageFormat (Plural / Select)

i18n_test.check_catalog only compares placeholder sets and interpolate does flat ${var} substitution — neither can render the count-aware messages real localisation needs, e.g. "{count, plural, one {# item} other {# items}}". This implements the ICU MessageFormat subset most apps use.

Pure standard library; imports no PySide6. The plural/ordinal category functions are pure and the rule callables are injectable, so rendering is fully deterministic in CI.

Headless API

from je_auto_control import format_message, plural_category, ordinal_category

plural = "{count, plural, one {# item} other {# items}}"
format_message(plural, {"count": 1})       # '1 item'
format_message(plural, {"count": 5})       # '5 items'

select = "{g, select, male {He} female {She} other {They}} won"
format_message(select, {"g": "female"})    # 'She won'

ordinal = "{place, selectordinal, one {#st} two {#nd} few {#rd} other {#th}}"
format_message(ordinal, {"place": 3})      # '3rd'

plural_category(2)                         # 'other'
ordinal_category(3)                        # 'few'

Supported: simple {name} arguments, select (e.g. gender), plural and selectordinal with the CLDR categories (zero/one/two/few/ many/other), exact =N selectors that win over a category, the # count placeholder, a plural offset: (# becomes count − offset), nested arguments, and ICU apostrophe quoting ('' → '; '{' → literal brace). plural_rules / ordinal_rules let you inject custom category functions; locale selects the built-ins (en, fr).

Executor commands

AC_format_message takes a pattern plus a JSON args object and returns {text}, accepting locale. It is exposed as the MCP tool ac_format_message and as a Script Builder command under Data.