@angular/common
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Angular - commonly needed directives and services
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JavaScript
/**
* @license
* Copyright Google LLC All Rights Reserved.
*
* Use of this source code is governed by an MIT-style license that can be
* found in the LICENSE file at https://angular.io/license
*/
import { DEFAULT_CURRENCY_CODE, Inject, LOCALE_ID, Pipe } from '@angular/core';
import { formatCurrency, formatNumber, formatPercent } from '../i18n/format_number';
import { getCurrencySymbol } from '../i18n/locale_data_api';
import { invalidPipeArgumentError } from './invalid_pipe_argument_error';
/**
* @ngModule CommonModule
* @description
*
* Formats a value according to digit options and locale rules.
* Locale determines group sizing and separator,
* decimal point character, and other locale-specific configurations.
*
* @see `formatNumber()`
*
* @usageNotes
*
* ### digitsInfo
*
* The value's decimal representation is specified by the `digitsInfo`
* parameter, written in the following format:<br>
*
* ```
* {minIntegerDigits}.{minFractionDigits}-{maxFractionDigits}
* ```
*
* - `minIntegerDigits`:
* The minimum number of integer digits before the decimal point.
* Default is 1.
*
* - `minFractionDigits`:
* The minimum number of digits after the decimal point.
* Default is 0.
*
* - `maxFractionDigits`:
* The maximum number of digits after the decimal point.
* Default is 3.
*
* If the formatted value is truncated it will be rounded using the "to-nearest" method:
*
* ```
* {{3.6 | number: '1.0-0'}}
* <!--will output '4'-->
*
* {{-3.6 | number:'1.0-0'}}
* <!--will output '-4'-->
* ```
*
* ### locale
*
* `locale` will format a value according to locale rules.
* Locale determines group sizing and separator,
* decimal point character, and other locale-specific configurations.
*
* When not supplied, uses the value of `LOCALE_ID`, which is `en-US` by default.
*
* See [Setting your app locale](guide/i18n#setting-up-the-locale-of-your-app).
*
* ### Example
*
* The following code shows how the pipe transforms values
* according to various format specifications,
* where the caller's default locale is `en-US`.
*
* <code-example path="common/pipes/ts/number_pipe.ts" region='NumberPipe'></code-example>
*
* @publicApi
*/
export class DecimalPipe {
constructor(_locale) {
this._locale = _locale;
}
/**
* @param value The value to be formatted.
* @param digitsInfo Sets digit and decimal representation.
* [See more](#digitsinfo).
* @param locale Specifies what locale format rules to use.
* [See more](#locale).
*/
transform(value, digitsInfo, locale) {
if (!isValue(value))
return null;
locale = locale || this._locale;
try {
const num = strToNumber(value);
return formatNumber(num, locale, digitsInfo);
}
catch (error) {
throw invalidPipeArgumentError(DecimalPipe, error.message);
}
}
}
DecimalPipe.decorators = [
{ type: Pipe, args: [{ name: 'number' },] }
];
DecimalPipe.ctorParameters = () => [
{ type: String, decorators: [{ type: Inject, args: [LOCALE_ID,] }] }
];
/**
* @ngModule CommonModule
* @description
*
* Transforms a number to a percentage
* string, formatted according to locale rules that determine group sizing and
* separator, decimal-point character, and other locale-specific
* configurations.
*
* @see `formatPercent()`
*
* @usageNotes
* The following code shows how the pipe transforms numbers
* into text strings, according to various format specifications,
* where the caller's default locale is `en-US`.
*
* <code-example path="common/pipes/ts/percent_pipe.ts" region='PercentPipe'></code-example>
*
* @publicApi
*/
export class PercentPipe {
constructor(_locale) {
this._locale = _locale;
}
transform(value, digitsInfo, locale) {
if (!isValue(value))
return null;
locale = locale || this._locale;
try {
const num = strToNumber(value);
return formatPercent(num, locale, digitsInfo);
}
catch (error) {
throw invalidPipeArgumentError(PercentPipe, error.message);
}
}
}
PercentPipe.decorators = [
{ type: Pipe, args: [{ name: 'percent' },] }
];
PercentPipe.ctorParameters = () => [
{ type: String, decorators: [{ type: Inject, args: [LOCALE_ID,] }] }
];
/**
* @ngModule CommonModule
* @description
*
* Transforms a number to a currency string, formatted according to locale rules
* that determine group sizing and separator, decimal-point character,
* and other locale-specific configurations.
*
* {@a currency-code-deprecation}
* <div class="alert is-helpful">
*
* **Deprecation notice:**
*
* The default currency code is currently always `USD` but this is deprecated from v9.
*
* **In v11 the default currency code will be taken from the current locale identified by
* the `LOCALE_ID` token. See the [i18n guide](guide/i18n#setting-up-the-locale-of-your-app) for
* more information.**
*
* If you need the previous behavior then set it by creating a `DEFAULT_CURRENCY_CODE` provider in
* your application `NgModule`:
*
* ```ts
* {provide: DEFAULT_CURRENCY_CODE, useValue: 'USD'}
* ```
*
* </div>
*
* @see `getCurrencySymbol()`
* @see `formatCurrency()`
*
* @usageNotes
* The following code shows how the pipe transforms numbers
* into text strings, according to various format specifications,
* where the caller's default locale is `en-US`.
*
* <code-example path="common/pipes/ts/currency_pipe.ts" region='CurrencyPipe'></code-example>
*
* @publicApi
*/
export class CurrencyPipe {
constructor(_locale, _defaultCurrencyCode = 'USD') {
this._locale = _locale;
this._defaultCurrencyCode = _defaultCurrencyCode;
}
transform(value, currencyCode, display = 'symbol', digitsInfo, locale) {
if (!isValue(value))
return null;
locale = locale || this._locale;
if (typeof display === 'boolean') {
if ((typeof ngDevMode === 'undefined' || ngDevMode) && console && console.warn) {
console.warn(`Warning: the currency pipe has been changed in Angular v5. The symbolDisplay option (third parameter) is now a string instead of a boolean. The accepted values are "code", "symbol" or "symbol-narrow".`);
}
display = display ? 'symbol' : 'code';
}
let currency = currencyCode || this._defaultCurrencyCode;
if (display !== 'code') {
if (display === 'symbol' || display === 'symbol-narrow') {
currency = getCurrencySymbol(currency, display === 'symbol' ? 'wide' : 'narrow', locale);
}
else {
currency = display;
}
}
try {
const num = strToNumber(value);
return formatCurrency(num, locale, currency, currencyCode, digitsInfo);
}
catch (error) {
throw invalidPipeArgumentError(CurrencyPipe, error.message);
}
}
}
CurrencyPipe.decorators = [
{ type: Pipe, args: [{ name: 'currency' },] }
];
CurrencyPipe.ctorParameters = () => [
{ type: String, decorators: [{ type: Inject, args: [LOCALE_ID,] }] },
{ type: String, decorators: [{ type: Inject, args: [DEFAULT_CURRENCY_CODE,] }] }
];
function isValue(value) {
return !(value == null || value === '' || value !== value);
}
/**
* Transforms a string into a number (if needed).
*/
function strToNumber(value) {
// Convert strings to numbers
if (typeof value === 'string' && !isNaN(Number(value) - parseFloat(value))) {
return Number(value);
}
if (typeof value !== 'number') {
throw new Error(`${value} is not a number`);
}
return value;
}
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`minIntegerDigits`:\n * The minimum number of integer digits before the decimal point.\n * Default is 1.\n *\n * - `minFractionDigits`:\n * The minimum number of digits after the decimal point.\n * Default is 0.\n *\n *  - `maxFractionDigits`:\n * The maximum number of digits after the decimal point.\n * Default is 3.\n *\n * If the formatted value is truncated it will be rounded using the \"to-nearest\" method:\n *\n * ```\n * {{3.6 | number: '1.0-0'}}\n * <!--will output '4'-->\n *\n * {{-3.6 | number:'1.0-0'}}\n * <!--will output '-4'-->\n * ```\n *\n * ### locale\n *\n * `locale` will format a value according to locale rules.\n * Locale determines group sizing and separator,\n * decimal point character, and other locale-specific configurations.\n *\n * When not supplied, uses the value of `LOCALE_ID`, which is `en-US` by default.\n *\n * See [Setting your app locale](guide/i18n#setting-up-the-locale-of-your-app).\n *\n * ### Example\n *\n * The following code shows how the pipe transforms values\n * according to various format specifications,\n * where the caller's default locale is `en-US`.\n *\n * <code-example path=\"common/pipes/ts/number_pipe.ts\" region='NumberPipe'></code-example>\n *\n * @publicApi\n */\n@Pipe({name: 'number'})\nexport class DecimalPipe implements PipeTransform {\n  constructor(@Inject(LOCALE_ID) private _locale: string) {}\n  transform(value: number|string, digitsInfo?: string, locale?: string): string|null;\n  transform(value: null|undefined, digitsInfo?: string, locale?: string): null;\n  transform(value: number|string|null|undefined, digitsInfo?: string, locale?: string): string|null;\n\n  /**\n   * @param value The value to be formatted.\n   * @param digitsInfo Sets digit and decimal representation.\n   * [See more](#digitsinfo).\n   * @param locale Specifies what locale format rules to use.\n   * [See more](#locale).\n   */\n  transform(value: number|string|null|undefined, digitsInfo?: string, locale?: string): string\n      |null {\n    if (!isValue(value)) return null;\n\n    locale = locale || this._locale;\n\n    try {\n      const num = strToNumber(value);\n      return formatNumber(num, locale, digitsInfo);\n    } catch (error) {\n      throw invalidPipeArgumentError(DecimalPipe, error.message);\n    }\n  }\n}\n\n/**\n * @ngModule CommonModule\n * @description\n *\n * Transforms a number to a percentage\n * string, formatted according to locale rules that determine group sizing and\n * separator, decimal-point character, and other locale-specific\n * configurations.\n *\n * @see `formatPercent()`\n *\n * @usageNotes\n * The following code shows how the pipe transforms numbers\n * into text strings, according to various format specifications,\n * where the caller's default locale is `en-US`.\n *\n * <code-example path=\"common/pipes/ts/percent_pipe.ts\" region='PercentPipe'></code-example>\n *\n * @publicApi\n */\n@Pipe({name: 'percent'})\nexport class PercentPipe implements PipeTransform {\n  constructor(@Inject(LOCALE_ID) private _locale: string) {}\n\n  /**\n   *\n   * @param value The number to be formatted as a percentage.\n   * @param digitsInfo Decimal representation options, specified by a string\n   * in the following format:<br>\n   * <code>{minIntegerDigits}.{minFractionDigits}-{maxFractionDigits}</code>.\n   *   - `minIntegerDigits`: The minimum number of integer digits before the decimal point.\n   * Default is `1`.\n   *   - `minFractionDigits`: The minimum number of digits after the decimal point.\n   * Default is `0`.\n   *   - `maxFractionDigits`: The maximum number of digits after the decimal point.\n   * Default is `0`.\n   * @param locale A locale code for the locale format rules to use.\n   * When not supplied, uses the value of `LOCALE_ID`, which is `en-US` by default.\n   * See [Setting your app locale](guide/i18n#setting-up-the-locale-of-your-app).\n   */\n  transform(value: number|string, digitsInfo?: string, locale?: string): string|null;\n  transform(value: null|undefined, digitsInfo?: string, locale?: string): null;\n  transform(value: number|string|null|undefined, digitsInfo?: string, locale?: string): string|null;\n  transform(value: number|string|null|undefined, digitsInfo?: string, locale?: string): string\n      |null {\n    if (!isValue(value)) return null;\n    locale = locale || this._locale;\n    try {\n      const num = strToNumber(value);\n      return formatPercent(num, locale, digitsInfo);\n    } catch (error) {\n      throw invalidPipeArgumentError(PercentPipe, error.message);\n    }\n  }\n}\n\n/**\n * @ngModule CommonModule\n * @description\n *\n * Transforms a number to a currency string, formatted according to locale rules\n * that determine group sizing and separator, decimal-point character,\n * and other locale-specific configurations.\n *\n * {@a currency-code-deprecation}\n * <div class=\"alert is-helpful\">\n *\n * **Deprecation notice:**\n *\n * The default currency code is currently always `USD` but this is deprecated from v9.\n *\n * **In v11 the default currency code will be taken from the current locale identified by\n * the `LOCALE_ID` token. See the [i18n guide](guide/i18n#setting-up-the-locale-of-your-app) for\n * more information.**\n *\n * If you need the previous behavior then set it by creating a `DEFAULT_CURRENCY_CODE` provider in\n * your application `NgModule`:\n *\n * ```ts\n * {provide: DEFAULT_CURRENCY_CODE, useValue: 'USD'}\n * ```\n *\n * </div>\n *\n * @see `getCurrencySymbol()`\n * @see `formatCurrency()`\n *\n * @usageNotes\n * The following code shows how the pipe transforms numbers\n * into text strings, according to various format specifications,\n * where the caller's default locale is `en-US`.\n *\n * <code-example path=\"common/pipes/ts/currency_pipe.ts\" region='CurrencyPipe'></code-example>\n *\n * @publicApi\n */\n@Pipe({name: 'currency'})\nexport class CurrencyPipe implements PipeTransform {\n  constructor(\n      @Inject(LOCALE_ID) private _locale: string,\n      @Inject(DEFAULT_CURRENCY_CODE) private _defaultCurrencyCode: string = 'USD') {}\n\n  /**\n   *\n   * @param value The number to be formatted as currency.\n   * @param currencyCode The [ISO 4217](https://en.wikipedia.org/wiki/ISO_4217) currency code,\n   * such as `USD` for the US dollar and `EUR` for the euro. The default currency code can be\n   * configured using the `DEFAULT_CURRENCY_CODE` injection token.\n   * @param display The format for the currency indicator. One of the following:\n   *   - `code`: Show the code (such as `USD`).\n   *   - `symbol`(default): Show the symbol (such as `$`).\n   *   - `symbol-narrow`: Use the narrow symbol for locales that have two symbols for their\n   * currency.\n   * For example, the Canadian dollar CAD has the symbol `CA$` and the symbol-narrow `$`. If the\n   * locale has no narrow symbol, uses the standard symbol for the locale.\n   *   - String: Use the given string value instead of a code or a symbol.\n   * For example, an empty string will suppress the currency & symbol.\n   *   - Boolean (marked deprecated in v5): `true` for symbol and false for `code`.\n   *\n   * @param digitsInfo Decimal representation options, specified by a string\n   * in the following format:<br>\n   * <code>{minIntegerDigits}.{minFractionDigits}-{maxFractionDigits}</code>.\n   *   - `minIntegerDigits`: The minimum number of integer digits before the decimal point.\n   * Default is `1`.\n   *   - `minFractionDigits`: The minimum number of digits after the decimal point.\n   * Default is `2`.\n   *   - `maxFractionDigits`: The maximum number of digits after the decimal point.\n   * Default is `2`.\n   * If not provided, the number will be formatted with the proper amount of digits,\n   * depending on what the [ISO 4217](https://en.wikipedia.org/wiki/ISO_4217) specifies.\n   * For example, the Canadian dollar has 2 digits, whereas the Chilean peso has none.\n   * @param locale A locale code for the locale format rules to use.\n   * When not supplied, uses the value of `LOCALE_ID`, which is `en-US` by default.\n   * See [Setting your app locale](guide/i18n#setting-up-the-locale-of-your-app).\n   */\n  transform(\n      value: number|string, currencyCode?: string,\n      display?: 'code'|'symbol'|'symbol-narrow'|string|boolean, digitsInfo?: string,\n      locale?: string): string|null;\n  transform(\n      value: null|undefined, currencyCode?: string,\n      display?: 'code'|'symbol'|'symbol-narrow'|string|boolean, digitsInfo?: string,\n      locale?: string): null;\n  transform(\n      value: number|string|null|undefined, currencyCode?: string,\n      display?: 'code'|'symbol'|'symbol-narrow'|string|boolean, digitsInfo?: string,\n      locale?: string): string|null;\n  transform(\n      value: number|string|null|undefined, currencyCode?: string,\n      display: 'code'|'symbol'|'symbol-narrow'|string|boolean = 'symbol', digitsInfo?: string,\n      locale?: string): string|null {\n    if (!isValue(value)) return null;\n\n    locale = locale || this._locale;\n\n    if (typeof display === 'boolean') {\n      if ((typeof ngDevMode === 'undefined' || ngDevMode) && <any>console && <any>console.warn) {\n        console.warn(\n            `Warning: the currency pipe has been changed in Angular v5. The symbolDisplay option (third parameter) is now a string instead of a boolean. The accepted values are \"code\", \"symbol\" or \"symbol-narrow\".`);\n      }\n      display = display ? 'symbol' : 'code';\n    }\n\n    let currency: string = currencyCode || this._defaultCurrencyCode;\n    if (display !== 'code') {\n      if (display === 'symbol' || display === 'symbol-narrow') {\n        currency = getCurrencySymbol(currency, display === 'symbol' ? 'wide' : 'narrow', locale);\n      } else {\n        currency = display;\n      }\n    }\n\n    try {\n      const num = strToNumber(value);\n      return formatCurrency(num, locale, currency, currencyCode, digitsInfo);\n    } catch (error) {\n      throw invalidPipeArgumentError(CurrencyPipe, error.message);\n    }\n  }\n}\n\nfunction isValue(value: number|string|null|undefined): value is number|string {\n  return !(value == null || value === '' || value !== value);\n}\n\n/**\n * Transforms a string into a number (if needed).\n */\nfunction strToNumber(value: number|string): number {\n  // Convert strings to numbers\n  if (typeof value === 'string' && !isNaN(Number(value) - parseFloat(value))) {\n    return Number(value);\n  }\n  if (typeof value !== 'number') {\n    throw new Error(`${value} is not a number`);\n  }\n  return value;\n}\n"]}