Module format 

Locale-aware number, currency, and date formatting — pure, synchronous, dependency-light.

view() builds the Widget tree synchronously, but device capabilities/plugins are async, so locale formatting can’t be delegated to the platform’s NumberFormatter/Intl at render time — it has to run in the core. This module hand-rolls the conventions for the locales Mobiler apps actually target (Swiss de/fr/it + the common Western locales) instead of pulling in a full ICU data bundle, keeping the wasm web shell small.

use mobiler_core::format::{format_currency, Currency, Locale};
assert_eq!(format_currency(1234.5, Currency::Chf, Locale::DeCh), "CHF 1'234.50");
assert_eq!(format_currency(1234.5, Currency::Eur, Locale::DeDe), "1.234,50 €");

Enums

Currency

A currency. Placement (symbol leading vs trailing) follows the Locale.

Locale

A formatting locale — drives digit grouping, the decimal mark, currency placement, and the date order + month names. Map a device language tag (e.g. from a locale plugin) to one with Locale::from_tag.

Weekday

A day of the week — the first column of a localized calendar (Locale::week_start).

Functions

format_currency

Format a monetary amount (always two fraction digits). Symbol placement follows locale: CHF/USD/GBP lead; EUR trails in de-DE/fr-FR/it-IT and leads elsewhere.

format_date

Numeric date in the locale’s conventional order/separator.

format_date_long

Long date with the localized month name (e.g. "5. Januar 2026", "January 5, 2026").

format_int

Format an integer, grouped per locale.

format_number

Format a floating-point number with a fixed number of decimal places, grouped per locale.

month_name

The localized full month name (month is 1–12, clamped).

month_year

A calendar title: the localized month name, capitalized, then the year ("Septembar 2026").

weekday_short

The localized narrow weekday label for a calendar header. sun0 is 0 = Sunday … 6 = Saturday and wraps, so weekday_short(start + i, …) walks a week from any start day.