1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167

// This file is part of ICU4X. For terms of use, please see the file
// called LICENSE at the top level of the ICU4X source tree
// (online at: https://github.com/unicode-org/icu4x/blob/main/LICENSE ).

//! Formatting basic decimal numbers.
//!
//! This module is published as its own crate ([`icu_decimal`](https://docs.rs/icu_decimal/latest/icu_decimal/))
//! and as part of the [`icu`](https://docs.rs/icu/latest/icu/) crate. See the latter for more details on the ICU4X project.
//!
//! Support for currencies, measurement units, and compact notation is planned. To track progress,
//! follow [icu4x#275](https://github.com/unicode-org/icu4x/issues/275).
//!
//! # Examples
//!
//! ## Format a number with Bangla digits
//!
//! ```
//! use fixed_decimal::FixedDecimal;
//! use icu::decimal::FixedDecimalFormatter;
//! use icu::locid::locale;
//! use writeable::assert_writeable_eq;
//!
//! let fdf = FixedDecimalFormatter::try_new(
//!     &locale!("bn").into(),
//!     Default::default(),
//! )
//! .expect("locale should be present");
//!
//! let fixed_decimal = FixedDecimal::from(1000007);
//!
//! assert_writeable_eq!(fdf.format(&fixed_decimal), "১০,০০,০০৭");
//! ```
//!
//! ## Format a number with digits after the decimal separator
//!
//! ```
//! use fixed_decimal::FixedDecimal;
//! use icu::decimal::FixedDecimalFormatter;
//! use icu::locid::Locale;
//! use writeable::assert_writeable_eq;
//!
//! let fdf =
//!     FixedDecimalFormatter::try_new(&Locale::UND.into(), Default::default())
//!         .expect("locale should be present");
//!
//! let fixed_decimal = FixedDecimal::from(200050).multiplied_pow10(-2);
//!
//! assert_writeable_eq!(fdf.format(&fixed_decimal), "2,000.50");
//! ```
//!
//! ### Format a number using an alternative numbering system
//!
//! Numbering systems specified in the `-u-nu` subtag will be followed as long as the locale has
//! symbols for that numbering system.
//!
//! ```
//! use fixed_decimal::FixedDecimal;
//! use icu::decimal::FixedDecimalFormatter;
//! use icu::locid::locale;
//! use writeable::assert_writeable_eq;
//!
//! let fdf = FixedDecimalFormatter::try_new(
//!     &locale!("th-u-nu-thai").into(),
//!     Default::default(),
//! )
//! .expect("locale should be present");
//!
//! let fixed_decimal = FixedDecimal::from(1000007);
//!
//! assert_writeable_eq!(fdf.format(&fixed_decimal), "๑,๐๐๐,๐๐๗");
//! ```
//!
//! [`FixedDecimalFormatter`]: FixedDecimalFormatter

// https://github.com/unicode-org/icu4x/blob/main/documents/process/boilerplate.md#library-annotations
#![cfg_attr(not(any(test, feature = "std")), no_std)]
#![cfg_attr(
    not(test),
    deny(
        clippy::indexing_slicing,
        clippy::unwrap_used,
        clippy::expect_used,
        clippy::panic,
        clippy::exhaustive_structs,
        clippy::exhaustive_enums,
        missing_debug_implementations,
    )
)]
#![warn(missing_docs)]

extern crate alloc;

mod error;
mod format;
mod grouper;
pub mod options;
pub mod provider;

pub use error::DecimalError;
pub use format::FormattedFixedDecimal;

#[doc(no_inline)]
pub use DecimalError as Error;

use alloc::string::String;
use fixed_decimal::FixedDecimal;
use icu_provider::prelude::*;
use writeable::Writeable;

/// A formatter for [`FixedDecimal`], rendering decimal digits in an i18n-friendly way.
///
/// [`FixedDecimalFormatter`] supports:
///
/// 1. Rendering in the local numbering system
/// 2. Locale-sensitive grouping separator positions
/// 3. Locale-sensitive plus and minus signs
///
/// Read more about the options in the [`options`] module.
///
/// See the crate-level documentation for examples.
#[derive(Debug)]
pub struct FixedDecimalFormatter {
    options: options::FixedDecimalFormatterOptions,
    symbols: DataPayload<provider::DecimalSymbolsV1Marker>,
}

impl FixedDecimalFormatter {
    icu_provider::gen_any_buffer_data_constructors!(
        locale: include,
        options: options::FixedDecimalFormatterOptions,
        error: DecimalError,
        /// Creates a new [`FixedDecimalFormatter`] from compiled data and an options bag.
        ///
        /// ✨ *Enabled with the `compiled_data` Cargo feature.*
        ///
        /// [📚 Help choosing a constructor](icu_provider::constructors)
    );

    #[doc = icu_provider::gen_any_buffer_unstable_docs!(UNSTABLE, Self::try_new)]
    pub fn try_new_unstable<D: DataProvider<provider::DecimalSymbolsV1Marker> + ?Sized>(
        provider: &D,
        locale: &DataLocale,
        options: options::FixedDecimalFormatterOptions,
    ) -> Result<Self, DecimalError> {
        let symbols = provider
            .load(DataRequest {
                locale,
                metadata: Default::default(),
            })?
            .take_payload()?;
        Ok(Self { options, symbols })
    }

    /// Formats a [`FixedDecimal`], returning a [`FormattedFixedDecimal`].
    pub fn format<'l>(&'l self, value: &'l FixedDecimal) -> FormattedFixedDecimal<'l> {
        FormattedFixedDecimal {
            value,
            options: &self.options,
            symbols: self.symbols.get(),
        }
    }

    /// Formats a [`FixedDecimal`], returning a [`String`].
    pub fn format_to_string(&self, value: &FixedDecimal) -> String {
        self.format(value).write_to_string().into_owned()
    }
}