| 1 | /**
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| 2 | * @license
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| 3 | * Copyright Google LLC All Rights Reserved.
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| 4 | *
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| 5 | * Use of this source code is governed by an MIT-style license that can be
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| 6 | * found in the LICENSE file at https://angular.io/license
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| 7 | */
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| 8 | import { InjectionToken, ɵisObservable as isObservable, ɵisPromise as isPromise } from '@angular/core';
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| 9 | import { forkJoin, from } from 'rxjs';
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| 10 | import { map } from 'rxjs/operators';
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| 11 | function isEmptyInputValue(value) {
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| 12 | // we don't check for string here so it also works with arrays
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| 13 | return value == null || value.length === 0;
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| 14 | }
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| 15 | function hasValidLength(value) {
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| 16 | // non-strict comparison is intentional, to check for both `null` and `undefined` values
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| 17 | return value != null && typeof value.length === 'number';
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| 18 | }
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| 19 | /**
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| 20 | * @description
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| 21 | * An `InjectionToken` for registering additional synchronous validators used with
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| 22 | * `AbstractControl`s.
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| 23 | *
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| 24 | * @see `NG_ASYNC_VALIDATORS`
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| 25 | *
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| 26 | * @usageNotes
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| 27 | *
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| 28 | * ### Providing a custom validator
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| 29 | *
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| 30 | * The following example registers a custom validator directive. Adding the validator to the
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| 31 | * existing collection of validators requires the `multi: true` option.
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| 32 | *
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| 33 | * ```typescript
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| 34 | * @Directive({
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| 35 | * selector: '[customValidator]',
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| 36 | * providers: [{provide: NG_VALIDATORS, useExisting: CustomValidatorDirective, multi: true}]
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| 37 | * })
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| 38 | * class CustomValidatorDirective implements Validator {
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| 39 | * validate(control: AbstractControl): ValidationErrors | null {
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| 40 | * return { 'custom': true };
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| 41 | * }
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| 42 | * }
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| 43 | * ```
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| 44 | *
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| 45 | * @publicApi
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| 46 | */
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| 47 | export const NG_VALIDATORS = new InjectionToken('NgValidators');
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| 48 | /**
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| 49 | * @description
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| 50 | * An `InjectionToken` for registering additional asynchronous validators used with
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| 51 | * `AbstractControl`s.
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| 52 | *
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| 53 | * @see `NG_VALIDATORS`
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| 54 | *
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| 55 | * @publicApi
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| 56 | */
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| 57 | export const NG_ASYNC_VALIDATORS = new InjectionToken('NgAsyncValidators');
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| 58 | /**
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| 59 | * A regular expression that matches valid e-mail addresses.
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| 60 | *
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| 61 | * At a high level, this regexp matches e-mail addresses of the format `local-part@tld`, where:
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| 62 | * - `local-part` consists of one or more of the allowed characters (alphanumeric and some
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| 63 | * punctuation symbols).
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| 64 | * - `local-part` cannot begin or end with a period (`.`).
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| 65 | * - `local-part` cannot be longer than 64 characters.
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| 66 | * - `tld` consists of one or more `labels` separated by periods (`.`). For example `localhost` or
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| 67 | * `foo.com`.
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| 68 | * - A `label` consists of one or more of the allowed characters (alphanumeric, dashes (`-`) and
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| 69 | * periods (`.`)).
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| 70 | * - A `label` cannot begin or end with a dash (`-`) or a period (`.`).
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| 71 | * - A `label` cannot be longer than 63 characters.
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| 72 | * - The whole address cannot be longer than 254 characters.
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| 73 | *
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| 74 | * ## Implementation background
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| 75 | *
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| 76 | * This regexp was ported over from AngularJS (see there for git history):
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| 77 | * https://github.com/angular/angular.js/blob/c133ef836/src/ng/directive/input.js#L27
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| 78 | * It is based on the
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| 79 | * [WHATWG version](https://html.spec.whatwg.org/multipage/input.html#valid-e-mail-address) with
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| 80 | * some enhancements to incorporate more RFC rules (such as rules related to domain names and the
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| 81 | * lengths of different parts of the address). The main differences from the WHATWG version are:
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| 82 | * - Disallow `local-part` to begin or end with a period (`.`).
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| 83 | * - Disallow `local-part` length to exceed 64 characters.
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| 84 | * - Disallow total address length to exceed 254 characters.
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| 85 | *
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| 86 | * See [this commit](https://github.com/angular/angular.js/commit/f3f5cf72e) for more details.
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| 87 | */
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| 88 | const EMAIL_REGEXP = /^(?=.{1,254}$)(?=.{1,64}@)[a-zA-Z0-9!#$%&'*+/=?^_`{|}~-]+(?:\.[a-zA-Z0-9!#$%&'*+/=?^_`{|}~-]+)*@[a-zA-Z0-9](?:[a-zA-Z0-9-]{0,61}[a-zA-Z0-9])?(?:\.[a-zA-Z0-9](?:[a-zA-Z0-9-]{0,61}[a-zA-Z0-9])?)*$/;
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| 89 | /**
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| 90 | * @description
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| 91 | * Provides a set of built-in validators that can be used by form controls.
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| 92 | *
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| 93 | * A validator is a function that processes a `FormControl` or collection of
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| 94 | * controls and returns an error map or null. A null map means that validation has passed.
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| 95 | *
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| 96 | * @see [Form Validation](/guide/form-validation)
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| 97 | *
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| 98 | * @publicApi
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| 99 | */
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| 100 | export class Validators {
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| 101 | /**
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| 102 | * @description
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| 103 | * Validator that requires the control's value to be greater than or equal to the provided number.
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| 104 | *
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| 105 | * @usageNotes
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| 106 | *
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| 107 | * ### Validate against a minimum of 3
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| 108 | *
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| 109 | * ```typescript
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| 110 | * const control = new FormControl(2, Validators.min(3));
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| 111 | *
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| 112 | * console.log(control.errors); // {min: {min: 3, actual: 2}}
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| 113 | * ```
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| 114 | *
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| 115 | * @returns A validator function that returns an error map with the
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| 116 | * `min` property if the validation check fails, otherwise `null`.
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| 117 | *
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| 118 | * @see `updateValueAndValidity()`
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| 119 | *
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| 120 | */
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| 121 | static min(min) {
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| 122 | return minValidator(min);
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| 123 | }
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| 124 | /**
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| 125 | * @description
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| 126 | * Validator that requires the control's value to be less than or equal to the provided number.
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| 127 | *
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| 128 | * @usageNotes
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| 129 | *
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| 130 | * ### Validate against a maximum of 15
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| 131 | *
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| 132 | * ```typescript
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| 133 | * const control = new FormControl(16, Validators.max(15));
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| 134 | *
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| 135 | * console.log(control.errors); // {max: {max: 15, actual: 16}}
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| 136 | * ```
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| 137 | *
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| 138 | * @returns A validator function that returns an error map with the
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| 139 | * `max` property if the validation check fails, otherwise `null`.
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| 140 | *
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| 141 | * @see `updateValueAndValidity()`
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| 142 | *
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| 143 | */
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| 144 | static max(max) {
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| 145 | return maxValidator(max);
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| 146 | }
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| 147 | /**
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| 148 | * @description
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| 149 | * Validator that requires the control have a non-empty value.
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| 150 | *
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| 151 | * @usageNotes
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| 152 | *
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| 153 | * ### Validate that the field is non-empty
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| 154 | *
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| 155 | * ```typescript
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| 156 | * const control = new FormControl('', Validators.required);
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| 157 | *
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| 158 | * console.log(control.errors); // {required: true}
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| 159 | * ```
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| 160 | *
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| 161 | * @returns An error map with the `required` property
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| 162 | * if the validation check fails, otherwise `null`.
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| 163 | *
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| 164 | * @see `updateValueAndValidity()`
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| 165 | *
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| 166 | */
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| 167 | static required(control) {
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| 168 | return requiredValidator(control);
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| 169 | }
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| 170 | /**
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| 171 | * @description
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| 172 | * Validator that requires the control's value be true. This validator is commonly
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| 173 | * used for required checkboxes.
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| 174 | *
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| 175 | * @usageNotes
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| 176 | *
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| 177 | * ### Validate that the field value is true
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| 178 | *
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| 179 | * ```typescript
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| 180 | * const control = new FormControl('', Validators.requiredTrue);
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| 181 | *
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| 182 | * console.log(control.errors); // {required: true}
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| 183 | * ```
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| 184 | *
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| 185 | * @returns An error map that contains the `required` property
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| 186 | * set to `true` if the validation check fails, otherwise `null`.
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| 187 | *
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| 188 | * @see `updateValueAndValidity()`
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| 189 | *
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| 190 | */
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| 191 | static requiredTrue(control) {
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| 192 | return requiredTrueValidator(control);
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| 193 | }
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| 194 | /**
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| 195 | * @description
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| 196 | * Validator that requires the control's value pass an email validation test.
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| 197 | *
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| 198 | * Tests the value using a [regular
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| 199 | * expression](https://developer.mozilla.org/en-US/docs/Web/JavaScript/Guide/Regular_Expressions)
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| 200 | * pattern suitable for common usecases. The pattern is based on the definition of a valid email
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| 201 | * address in the [WHATWG HTML
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| 202 | * specification](https://html.spec.whatwg.org/multipage/input.html#valid-e-mail-address) with
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| 203 | * some enhancements to incorporate more RFC rules (such as rules related to domain names and the
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| 204 | * lengths of different parts of the address).
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| 205 | *
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| 206 | * The differences from the WHATWG version include:
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| 207 | * - Disallow `local-part` (the part before the `@` symbol) to begin or end with a period (`.`).
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| 208 | * - Disallow `local-part` to be longer than 64 characters.
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| 209 | * - Disallow the whole address to be longer than 254 characters.
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| 210 | *
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| 211 | * If this pattern does not satisfy your business needs, you can use `Validators.pattern()` to
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| 212 | * validate the value against a different pattern.
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| 213 | *
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| 214 | * @usageNotes
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| 215 | *
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| 216 | * ### Validate that the field matches a valid email pattern
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| 217 | *
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| 218 | * ```typescript
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| 219 | * const control = new FormControl('bad@', Validators.email);
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| 220 | *
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| 221 | * console.log(control.errors); // {email: true}
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| 222 | * ```
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| 223 | *
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| 224 | * @returns An error map with the `email` property
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| 225 | * if the validation check fails, otherwise `null`.
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| 226 | *
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| 227 | * @see `updateValueAndValidity()`
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| 228 | *
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| 229 | */
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| 230 | static email(control) {
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| 231 | return emailValidator(control);
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| 232 | }
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| 233 | /**
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| 234 | * @description
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| 235 | * Validator that requires the length of the control's value to be greater than or equal
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| 236 | * to the provided minimum length. This validator is also provided by default if you use the
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| 237 | * the HTML5 `minlength` attribute. Note that the `minLength` validator is intended to be used
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| 238 | * only for types that have a numeric `length` property, such as strings or arrays. The
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| 239 | * `minLength` validator logic is also not invoked for values when their `length` property is 0
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| 240 | * (for example in case of an empty string or an empty array), to support optional controls. You
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| 241 | * can use the standard `required` validator if empty values should not be considered valid.
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| 242 | *
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| 243 | * @usageNotes
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| 244 | *
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| 245 | * ### Validate that the field has a minimum of 3 characters
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| 246 | *
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| 247 | * ```typescript
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| 248 | * const control = new FormControl('ng', Validators.minLength(3));
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| 249 | *
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| 250 | * console.log(control.errors); // {minlength: {requiredLength: 3, actualLength: 2}}
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| 251 | * ```
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| 252 | *
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| 253 | * ```html
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| 254 | * <input minlength="5">
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| 255 | * ```
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| 256 | *
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| 257 | * @returns A validator function that returns an error map with the
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| 258 | * `minlength` property if the validation check fails, otherwise `null`.
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| 259 | *
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| 260 | * @see `updateValueAndValidity()`
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| 261 | *
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| 262 | */
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| 263 | static minLength(minLength) {
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| 264 | return minLengthValidator(minLength);
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| 265 | }
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| 266 | /**
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| 267 | * @description
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| 268 | * Validator that requires the length of the control's value to be less than or equal
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| 269 | * to the provided maximum length. This validator is also provided by default if you use the
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| 270 | * the HTML5 `maxlength` attribute. Note that the `maxLength` validator is intended to be used
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| 271 | * only for types that have a numeric `length` property, such as strings or arrays.
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| 272 | *
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| 273 | * @usageNotes
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| 274 | *
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| 275 | * ### Validate that the field has maximum of 5 characters
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| 276 | *
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| 277 | * ```typescript
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| 278 | * const control = new FormControl('Angular', Validators.maxLength(5));
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| 279 | *
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| 280 | * console.log(control.errors); // {maxlength: {requiredLength: 5, actualLength: 7}}
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| 281 | * ```
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| 282 | *
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| 283 | * ```html
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| 284 | * <input maxlength="5">
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| 285 | * ```
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| 286 | *
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| 287 | * @returns A validator function that returns an error map with the
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| 288 | * `maxlength` property if the validation check fails, otherwise `null`.
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| 289 | *
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| 290 | * @see `updateValueAndValidity()`
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| 291 | *
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| 292 | */
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| 293 | static maxLength(maxLength) {
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| 294 | return maxLengthValidator(maxLength);
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| 295 | }
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| 296 | /**
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| 297 | * @description
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| 298 | * Validator that requires the control's value to match a regex pattern. This validator is also
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| 299 | * provided by default if you use the HTML5 `pattern` attribute.
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| 300 | *
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| 301 | * @usageNotes
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| 302 | *
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| 303 | * ### Validate that the field only contains letters or spaces
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| 304 | *
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| 305 | * ```typescript
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| 306 | * const control = new FormControl('1', Validators.pattern('[a-zA-Z ]*'));
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| 307 | *
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| 308 | * console.log(control.errors); // {pattern: {requiredPattern: '^[a-zA-Z ]*$', actualValue: '1'}}
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| 309 | * ```
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| 310 | *
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| 311 | * ```html
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| 312 | * <input pattern="[a-zA-Z ]*">
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| 313 | * ```
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| 314 | *
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| 315 | * ### Pattern matching with the global or sticky flag
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| 316 | *
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| 317 | * `RegExp` objects created with the `g` or `y` flags that are passed into `Validators.pattern`
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| 318 | * can produce different results on the same input when validations are run consecutively. This is
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| 319 | * due to how the behavior of `RegExp.prototype.test` is
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| 320 | * specified in [ECMA-262](https://tc39.es/ecma262/#sec-regexpbuiltinexec)
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| 321 | * (`RegExp` preserves the index of the last match when the global or sticky flag is used).
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| 322 | * Due to this behavior, it is recommended that when using
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| 323 | * `Validators.pattern` you **do not** pass in a `RegExp` object with either the global or sticky
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| 324 | * flag enabled.
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| 325 | *
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| 326 | * ```typescript
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| 327 | * // Not recommended (since the `g` flag is used)
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| 328 | * const controlOne = new FormControl('1', Validators.pattern(/foo/g));
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| 329 | *
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| 330 | * // Good
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| 331 | * const controlTwo = new FormControl('1', Validators.pattern(/foo/));
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| 332 | * ```
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| 333 | *
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| 334 | * @param pattern A regular expression to be used as is to test the values, or a string.
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| 335 | * If a string is passed, the `^` character is prepended and the `$` character is
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| 336 | * appended to the provided string (if not already present), and the resulting regular
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| 337 | * expression is used to test the values.
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| 338 | *
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| 339 | * @returns A validator function that returns an error map with the
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| 340 | * `pattern` property if the validation check fails, otherwise `null`.
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| 341 | *
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| 342 | * @see `updateValueAndValidity()`
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| 343 | *
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| 344 | */
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| 345 | static pattern(pattern) {
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| 346 | return patternValidator(pattern);
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| 347 | }
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| 348 | /**
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| 349 | * @description
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| 350 | * Validator that performs no operation.
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| 351 | *
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| 352 | * @see `updateValueAndValidity()`
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| 353 | *
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| 354 | */
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| 355 | static nullValidator(control) {
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| 356 | return nullValidator(control);
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| 357 | }
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| 358 | static compose(validators) {
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| 359 | return compose(validators);
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| 360 | }
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| 361 | /**
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| 362 | * @description
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| 363 | * Compose multiple async validators into a single function that returns the union
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| 364 | * of the individual error objects for the provided control.
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| 365 | *
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| 366 | * @returns A validator function that returns an error map with the
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| 367 | * merged error objects of the async validators if the validation check fails, otherwise `null`.
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| 368 | *
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| 369 | * @see `updateValueAndValidity()`
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| 370 | *
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| 371 | */
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| 372 | static composeAsync(validators) {
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| 373 | return composeAsync(validators);
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| 374 | }
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| 375 | }
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| 376 | /**
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| 377 | * Validator that requires the control's value to be greater than or equal to the provided number.
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| 378 | * See `Validators.min` for additional information.
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| 379 | */
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| 380 | export function minValidator(min) {
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| 381 | return (control) => {
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| 382 | if (isEmptyInputValue(control.value) || isEmptyInputValue(min)) {
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| 383 | return null; // don't validate empty values to allow optional controls
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| 384 | }
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| 385 | const value = parseFloat(control.value);
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| 386 | // Controls with NaN values after parsing should be treated as not having a
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| 387 | // minimum, per the HTML forms spec: https://www.w3.org/TR/html5/forms.html#attr-input-min
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| 388 | return !isNaN(value) && value < min ? { 'min': { 'min': min, 'actual': control.value } } : null;
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| 389 | };
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| 390 | }
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| 391 | /**
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| 392 | * Validator that requires the control's value to be less than or equal to the provided number.
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| 393 | * See `Validators.max` for additional information.
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| 394 | */
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| 395 | export function maxValidator(max) {
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| 396 | return (control) => {
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| 397 | if (isEmptyInputValue(control.value) || isEmptyInputValue(max)) {
|
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| 398 | return null; // don't validate empty values to allow optional controls
|
|---|
| 399 | }
|
|---|
| 400 | const value = parseFloat(control.value);
|
|---|
| 401 | // Controls with NaN values after parsing should be treated as not having a
|
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| 402 | // maximum, per the HTML forms spec: https://www.w3.org/TR/html5/forms.html#attr-input-max
|
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| 403 | return !isNaN(value) && value > max ? { 'max': { 'max': max, 'actual': control.value } } : null;
|
|---|
| 404 | };
|
|---|
| 405 | }
|
|---|
| 406 | /**
|
|---|
| 407 | * Validator that requires the control have a non-empty value.
|
|---|
| 408 | * See `Validators.required` for additional information.
|
|---|
| 409 | */
|
|---|
| 410 | export function requiredValidator(control) {
|
|---|
| 411 | return isEmptyInputValue(control.value) ? { 'required': true } : null;
|
|---|
| 412 | }
|
|---|
| 413 | /**
|
|---|
| 414 | * Validator that requires the control's value be true. This validator is commonly
|
|---|
| 415 | * used for required checkboxes.
|
|---|
| 416 | * See `Validators.requiredTrue` for additional information.
|
|---|
| 417 | */
|
|---|
| 418 | export function requiredTrueValidator(control) {
|
|---|
| 419 | return control.value === true ? null : { 'required': true };
|
|---|
| 420 | }
|
|---|
| 421 | /**
|
|---|
| 422 | * Validator that requires the control's value pass an email validation test.
|
|---|
| 423 | * See `Validators.email` for additional information.
|
|---|
| 424 | */
|
|---|
| 425 | export function emailValidator(control) {
|
|---|
| 426 | if (isEmptyInputValue(control.value)) {
|
|---|
| 427 | return null; // don't validate empty values to allow optional controls
|
|---|
| 428 | }
|
|---|
| 429 | return EMAIL_REGEXP.test(control.value) ? null : { 'email': true };
|
|---|
| 430 | }
|
|---|
| 431 | /**
|
|---|
| 432 | * Validator that requires the length of the control's value to be greater than or equal
|
|---|
| 433 | * to the provided minimum length. See `Validators.minLength` for additional information.
|
|---|
| 434 | */
|
|---|
| 435 | export function minLengthValidator(minLength) {
|
|---|
| 436 | return (control) => {
|
|---|
| 437 | if (isEmptyInputValue(control.value) || !hasValidLength(control.value)) {
|
|---|
| 438 | // don't validate empty values to allow optional controls
|
|---|
| 439 | // don't validate values without `length` property
|
|---|
| 440 | return null;
|
|---|
| 441 | }
|
|---|
| 442 | return control.value.length < minLength ?
|
|---|
| 443 | { 'minlength': { 'requiredLength': minLength, 'actualLength': control.value.length } } :
|
|---|
| 444 | null;
|
|---|
| 445 | };
|
|---|
| 446 | }
|
|---|
| 447 | /**
|
|---|
| 448 | * Validator that requires the length of the control's value to be less than or equal
|
|---|
| 449 | * to the provided maximum length. See `Validators.maxLength` for additional information.
|
|---|
| 450 | */
|
|---|
| 451 | export function maxLengthValidator(maxLength) {
|
|---|
| 452 | return (control) => {
|
|---|
| 453 | return hasValidLength(control.value) && control.value.length > maxLength ?
|
|---|
| 454 | { 'maxlength': { 'requiredLength': maxLength, 'actualLength': control.value.length } } :
|
|---|
| 455 | null;
|
|---|
| 456 | };
|
|---|
| 457 | }
|
|---|
| 458 | /**
|
|---|
| 459 | * Validator that requires the control's value to match a regex pattern.
|
|---|
| 460 | * See `Validators.pattern` for additional information.
|
|---|
| 461 | */
|
|---|
| 462 | export function patternValidator(pattern) {
|
|---|
| 463 | if (!pattern)
|
|---|
| 464 | return nullValidator;
|
|---|
| 465 | let regex;
|
|---|
| 466 | let regexStr;
|
|---|
| 467 | if (typeof pattern === 'string') {
|
|---|
| 468 | regexStr = '';
|
|---|
| 469 | if (pattern.charAt(0) !== '^')
|
|---|
| 470 | regexStr += '^';
|
|---|
| 471 | regexStr += pattern;
|
|---|
| 472 | if (pattern.charAt(pattern.length - 1) !== '$')
|
|---|
| 473 | regexStr += '$';
|
|---|
| 474 | regex = new RegExp(regexStr);
|
|---|
| 475 | }
|
|---|
| 476 | else {
|
|---|
| 477 | regexStr = pattern.toString();
|
|---|
| 478 | regex = pattern;
|
|---|
| 479 | }
|
|---|
| 480 | return (control) => {
|
|---|
| 481 | if (isEmptyInputValue(control.value)) {
|
|---|
| 482 | return null; // don't validate empty values to allow optional controls
|
|---|
| 483 | }
|
|---|
| 484 | const value = control.value;
|
|---|
| 485 | return regex.test(value) ? null :
|
|---|
| 486 | { 'pattern': { 'requiredPattern': regexStr, 'actualValue': value } };
|
|---|
| 487 | };
|
|---|
| 488 | }
|
|---|
| 489 | /**
|
|---|
| 490 | * Function that has `ValidatorFn` shape, but performs no operation.
|
|---|
| 491 | */
|
|---|
| 492 | export function nullValidator(control) {
|
|---|
| 493 | return null;
|
|---|
| 494 | }
|
|---|
| 495 | function isPresent(o) {
|
|---|
| 496 | return o != null;
|
|---|
| 497 | }
|
|---|
| 498 | export function toObservable(r) {
|
|---|
| 499 | const obs = isPromise(r) ? from(r) : r;
|
|---|
| 500 | if (!(isObservable(obs)) && (typeof ngDevMode === 'undefined' || ngDevMode)) {
|
|---|
| 501 | throw new Error(`Expected validator to return Promise or Observable.`);
|
|---|
| 502 | }
|
|---|
| 503 | return obs;
|
|---|
| 504 | }
|
|---|
| 505 | function mergeErrors(arrayOfErrors) {
|
|---|
| 506 | let res = {};
|
|---|
| 507 | // Not using Array.reduce here due to a Chrome 80 bug
|
|---|
| 508 | // https://bugs.chromium.org/p/chromium/issues/detail?id=1049982
|
|---|
| 509 | arrayOfErrors.forEach((errors) => {
|
|---|
| 510 | res = errors != null ? Object.assign(Object.assign({}, res), errors) : res;
|
|---|
| 511 | });
|
|---|
| 512 | return Object.keys(res).length === 0 ? null : res;
|
|---|
| 513 | }
|
|---|
| 514 | function executeValidators(control, validators) {
|
|---|
| 515 | return validators.map(validator => validator(control));
|
|---|
| 516 | }
|
|---|
| 517 | function isValidatorFn(validator) {
|
|---|
| 518 | return !validator.validate;
|
|---|
| 519 | }
|
|---|
| 520 | /**
|
|---|
| 521 | * Given the list of validators that may contain both functions as well as classes, return the list
|
|---|
| 522 | * of validator functions (convert validator classes into validator functions). This is needed to
|
|---|
| 523 | * have consistent structure in validators list before composing them.
|
|---|
| 524 | *
|
|---|
| 525 | * @param validators The set of validators that may contain validators both in plain function form
|
|---|
| 526 | * as well as represented as a validator class.
|
|---|
| 527 | */
|
|---|
| 528 | export function normalizeValidators(validators) {
|
|---|
| 529 | return validators.map(validator => {
|
|---|
| 530 | return isValidatorFn(validator) ?
|
|---|
| 531 | validator :
|
|---|
| 532 | ((c) => validator.validate(c));
|
|---|
| 533 | });
|
|---|
| 534 | }
|
|---|
| 535 | /**
|
|---|
| 536 | * Merges synchronous validators into a single validator function.
|
|---|
| 537 | * See `Validators.compose` for additional information.
|
|---|
| 538 | */
|
|---|
| 539 | function compose(validators) {
|
|---|
| 540 | if (!validators)
|
|---|
| 541 | return null;
|
|---|
| 542 | const presentValidators = validators.filter(isPresent);
|
|---|
| 543 | if (presentValidators.length == 0)
|
|---|
| 544 | return null;
|
|---|
| 545 | return function (control) {
|
|---|
| 546 | return mergeErrors(executeValidators(control, presentValidators));
|
|---|
| 547 | };
|
|---|
| 548 | }
|
|---|
| 549 | /**
|
|---|
| 550 | * Accepts a list of validators of different possible shapes (`Validator` and `ValidatorFn`),
|
|---|
| 551 | * normalizes the list (converts everything to `ValidatorFn`) and merges them into a single
|
|---|
| 552 | * validator function.
|
|---|
| 553 | */
|
|---|
| 554 | export function composeValidators(validators) {
|
|---|
| 555 | return validators != null ? compose(normalizeValidators(validators)) : null;
|
|---|
| 556 | }
|
|---|
| 557 | /**
|
|---|
| 558 | * Merges asynchronous validators into a single validator function.
|
|---|
| 559 | * See `Validators.composeAsync` for additional information.
|
|---|
| 560 | */
|
|---|
| 561 | function composeAsync(validators) {
|
|---|
| 562 | if (!validators)
|
|---|
| 563 | return null;
|
|---|
| 564 | const presentValidators = validators.filter(isPresent);
|
|---|
| 565 | if (presentValidators.length == 0)
|
|---|
| 566 | return null;
|
|---|
| 567 | return function (control) {
|
|---|
| 568 | const observables = executeValidators(control, presentValidators).map(toObservable);
|
|---|
| 569 | return forkJoin(observables).pipe(map(mergeErrors));
|
|---|
| 570 | };
|
|---|
| 571 | }
|
|---|
| 572 | /**
|
|---|
| 573 | * Accepts a list of async validators of different possible shapes (`AsyncValidator` and
|
|---|
| 574 | * `AsyncValidatorFn`), normalizes the list (converts everything to `AsyncValidatorFn`) and merges
|
|---|
| 575 | * them into a single validator function.
|
|---|
| 576 | */
|
|---|
| 577 | export function composeAsyncValidators(validators) {
|
|---|
| 578 | return validators != null ? composeAsync(normalizeValidators(validators)) :
|
|---|
| 579 | null;
|
|---|
| 580 | }
|
|---|
| 581 | /**
|
|---|
| 582 | * Merges raw control validators with a given directive validator and returns the combined list of
|
|---|
| 583 | * validators as an array.
|
|---|
| 584 | */
|
|---|
| 585 | export function mergeValidators(controlValidators, dirValidator) {
|
|---|
| 586 | if (controlValidators === null)
|
|---|
| 587 | return [dirValidator];
|
|---|
| 588 | return Array.isArray(controlValidators) ? [...controlValidators, dirValidator] :
|
|---|
| 589 | [controlValidators, dirValidator];
|
|---|
| 590 | }
|
|---|
| 591 | /**
|
|---|
| 592 | * Retrieves the list of raw synchronous validators attached to a given control.
|
|---|
| 593 | */
|
|---|
| 594 | export function getControlValidators(control) {
|
|---|
| 595 | return control._rawValidators;
|
|---|
| 596 | }
|
|---|
| 597 | /**
|
|---|
| 598 | * Retrieves the list of raw asynchronous validators attached to a given control.
|
|---|
| 599 | */
|
|---|
| 600 | export function getControlAsyncValidators(control) {
|
|---|
| 601 | return control._rawAsyncValidators;
|
|---|
| 602 | }
|
|---|
| 603 | /**
|
|---|
| 604 | * Accepts a singleton validator, an array, or null, and returns an array type with the provided
|
|---|
| 605 | * validators.
|
|---|
| 606 | *
|
|---|
| 607 | * @param validators A validator, validators, or null.
|
|---|
| 608 | * @returns A validators array.
|
|---|
| 609 | */
|
|---|
| 610 | export function makeValidatorsArray(validators) {
|
|---|
| 611 | if (!validators)
|
|---|
| 612 | return [];
|
|---|
| 613 | return Array.isArray(validators) ? validators : [validators];
|
|---|
| 614 | }
|
|---|
| 615 | /**
|
|---|
| 616 | * Determines whether a validator or validators array has a given validator.
|
|---|
| 617 | *
|
|---|
| 618 | * @param validators The validator or validators to compare against.
|
|---|
| 619 | * @param validator The validator to check.
|
|---|
| 620 | * @returns Whether the validator is present.
|
|---|
| 621 | */
|
|---|
| 622 | export function hasValidator(validators, validator) {
|
|---|
| 623 | return Array.isArray(validators) ? validators.includes(validator) : validators === validator;
|
|---|
| 624 | }
|
|---|
| 625 | /**
|
|---|
| 626 | * Combines two arrays of validators into one. If duplicates are provided, only one will be added.
|
|---|
| 627 | *
|
|---|
| 628 | * @param validators The new validators.
|
|---|
| 629 | * @param currentValidators The base array of currrent validators.
|
|---|
| 630 | * @returns An array of validators.
|
|---|
| 631 | */
|
|---|
| 632 | export function addValidators(validators, currentValidators) {
|
|---|
| 633 | const current = makeValidatorsArray(currentValidators);
|
|---|
| 634 | const validatorsToAdd = makeValidatorsArray(validators);
|
|---|
| 635 | validatorsToAdd.forEach((v) => {
|
|---|
| 636 | // Note: if there are duplicate entries in the new validators array,
|
|---|
| 637 | // only the first one would be added to the current list of validarors.
|
|---|
| 638 | // Duplicate ones would be ignored since `hasValidator` would detect
|
|---|
| 639 | // the presence of a validator function and we update the current list in place.
|
|---|
| 640 | if (!hasValidator(current, v)) {
|
|---|
| 641 | current.push(v);
|
|---|
| 642 | }
|
|---|
| 643 | });
|
|---|
| 644 | return current;
|
|---|
| 645 | }
|
|---|
| 646 | export function removeValidators(validators, currentValidators) {
|
|---|
| 647 | return makeValidatorsArray(currentValidators).filter(v => !hasValidator(validators, v));
|
|---|
| 648 | }
|
|---|
| 649 | //# 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* @license\n * Copyright Google LLC All Rights Reserved.\n *\n * Use of this source code is governed by an MIT-style license that can be\n * found in the LICENSE file at https://angular.io/license\n */\n\nimport {InjectionToken, ɵisObservable as isObservable, ɵisPromise as isPromise} from '@angular/core';\nimport {forkJoin, from, Observable} from 'rxjs';\nimport {map} from 'rxjs/operators';\n\nimport {AsyncValidator, AsyncValidatorFn, ValidationErrors, Validator, ValidatorFn} from './directives/validators';\nimport {AbstractControl} from './model';\n\nfunction isEmptyInputValue(value: any): boolean {\n  // we don't check for string here so it also works with arrays\n  return value == null || value.length === 0;\n}\n\nfunction hasValidLength(value: any): boolean {\n  // non-strict comparison is intentional, to check for both `null` and `undefined` values\n  return value != null && typeof value.length === 'number';\n}\n\n/**\n * @description\n * An `InjectionToken` for registering additional synchronous validators used with\n * `AbstractControl`s.\n *\n * @see `NG_ASYNC_VALIDATORS`\n *\n * @usageNotes\n *\n * ### Providing a custom validator\n *\n * The following example registers a custom validator directive. Adding the validator to the\n * existing collection of validators requires the `multi: true` option.\n *\n * ```typescript\n * @Directive({\n *   selector: '[customValidator]',\n *   providers: [{provide: NG_VALIDATORS, useExisting: CustomValidatorDirective, multi: true}]\n * })\n * class CustomValidatorDirective implements Validator {\n *   validate(control: AbstractControl): ValidationErrors | null {\n *     return { 'custom': true };\n *   }\n * }\n * ```\n *\n * @publicApi\n */\nexport const NG_VALIDATORS = new InjectionToken<Array<Validator|Function>>('NgValidators');\n\n/**\n * @description\n * An `InjectionToken` for registering additional asynchronous validators used with\n * `AbstractControl`s.\n *\n * @see `NG_VALIDATORS`\n *\n * @publicApi\n */\nexport const NG_ASYNC_VALIDATORS =\n    new InjectionToken<Array<Validator|Function>>('NgAsyncValidators');\n\n/**\n * A regular expression that matches valid e-mail addresses.\n *\n * At a high level, this regexp matches e-mail addresses of the format `local-part@tld`, where:\n * - `local-part` consists of one or more of the allowed characters (alphanumeric and some\n *   punctuation symbols).\n * - `local-part` cannot begin or end with a period (`.`).\n * - `local-part` cannot be longer than 64 characters.\n * - `tld` consists of one or more `labels` separated by periods (`.`). For example `localhost` or\n *   `foo.com`.\n * - A `label` consists of one or more of the allowed characters (alphanumeric, dashes (`-`) and\n *   periods (`.`)).\n * - A `label` cannot begin or end with a dash (`-`) or a period (`.`).\n * - A `label` cannot be longer than 63 characters.\n * - The whole address cannot be longer than 254 characters.\n *\n * ## Implementation background\n *\n * This regexp was ported over from AngularJS (see there for git history):\n * https://github.com/angular/angular.js/blob/c133ef836/src/ng/directive/input.js#L27\n * It is based on the\n * [WHATWG version](https://html.spec.whatwg.org/multipage/input.html#valid-e-mail-address) with\n * some enhancements to incorporate more RFC rules (such as rules related to domain names and the\n * lengths of different parts of the address). The main differences from the WHATWG version are:\n *   - Disallow `local-part` to begin or end with a period (`.`).\n *   - Disallow `local-part` length to exceed 64 characters.\n *   - Disallow total address length to exceed 254 characters.\n *\n * See [this commit](https://github.com/angular/angular.js/commit/f3f5cf72e) for more details.\n */\nconst EMAIL_REGEXP =\n    /^(?=.{1,254}$)(?=.{1,64}@)[a-zA-Z0-9!#$%&'*+/=?^_`{|}~-]+(?:\\.[a-zA-Z0-9!#$%&'*+/=?^_`{|}~-]+)*@[a-zA-Z0-9](?:[a-zA-Z0-9-]{0,61}[a-zA-Z0-9])?(?:\\.[a-zA-Z0-9](?:[a-zA-Z0-9-]{0,61}[a-zA-Z0-9])?)*$/;\n\n/**\n * @description\n * Provides a set of built-in validators that can be used by form controls.\n *\n * A validator is a function that processes a `FormControl` or collection of\n * controls and returns an error map or null. A null map means that validation has passed.\n *\n * @see [Form Validation](/guide/form-validation)\n *\n * @publicApi\n */\nexport class Validators {\n  /**\n   * @description\n   * Validator that requires the control's value to be greater than or equal to the provided number.\n   *\n   * @usageNotes\n   *\n   * ### Validate against a minimum of 3\n   *\n   * ```typescript\n   * const control = new FormControl(2, Validators.min(3));\n   *\n   * console.log(control.errors); // {min: {min: 3, actual: 2}}\n   * ```\n   *\n   * @returns A validator function that returns an error map with the\n   * `min` property if the validation check fails, otherwise `null`.\n   *\n   * @see `updateValueAndValidity()`\n   *\n   */\n  static min(min: number): ValidatorFn {\n    return minValidator(min);\n  }\n\n  /**\n   * @description\n   * Validator that requires the control's value to be less than or equal to the provided number.\n   *\n   * @usageNotes\n   *\n   * ### Validate against a maximum of 15\n   *\n   * ```typescript\n   * const control = new FormControl(16, Validators.max(15));\n   *\n   * console.log(control.errors); // {max: {max: 15, actual: 16}}\n   * ```\n   *\n   * @returns A validator function that returns an error map with the\n   * `max` property if the validation check fails, otherwise `null`.\n   *\n   * @see `updateValueAndValidity()`\n   *\n   */\n  static max(max: number): ValidatorFn {\n    return maxValidator(max);\n  }\n\n  /**\n   * @description\n   * Validator that requires the control have a non-empty value.\n   *\n   * @usageNotes\n   *\n   * ### Validate that the field is non-empty\n   *\n   * ```typescript\n   * const control = new FormControl('', Validators.required);\n   *\n   * console.log(control.errors); // {required: true}\n   * ```\n   *\n   * @returns An error map with the `required` property\n   * if the validation check fails, otherwise `null`.\n   *\n   * @see `updateValueAndValidity()`\n   *\n   */\n  static required(control: AbstractControl): ValidationErrors|null {\n    return requiredValidator(control);\n  }\n\n  /**\n   * @description\n   * Validator that requires the control's value be true. This validator is commonly\n   * used for required checkboxes.\n   *\n   * @usageNotes\n   *\n   * ### Validate that the field value is true\n   *\n   * ```typescript\n   * const control = new FormControl('', Validators.requiredTrue);\n   *\n   * console.log(control.errors); // {required: true}\n   * ```\n   *\n   * @returns An error map that contains the `required` property\n   * set to `true` if the validation check fails, otherwise `null`.\n   *\n   * @see `updateValueAndValidity()`\n   *\n   */\n  static requiredTrue(control: AbstractControl): ValidationErrors|null {\n    return requiredTrueValidator(control);\n  }\n\n  /**\n   * @description\n   * Validator that requires the control's value pass an email validation test.\n   *\n   * Tests the value using a [regular\n   * expression](https://developer.mozilla.org/en-US/docs/Web/JavaScript/Guide/Regular_Expressions)\n   * pattern suitable for common usecases. The pattern is based on the definition of a valid email\n   * address in the [WHATWG HTML\n   * specification](https://html.spec.whatwg.org/multipage/input.html#valid-e-mail-address) with\n   * some enhancements to incorporate more RFC rules (such as rules related to domain names and the\n   * lengths of different parts of the address).\n   *\n   * The differences from the WHATWG version include:\n   * - Disallow `local-part` (the part before the `@` symbol) to begin or end with a period (`.`).\n   * - Disallow `local-part` to be longer than 64 characters.\n   * - Disallow the whole address to be longer than 254 characters.\n   *\n   * If this pattern does not satisfy your business needs, you can use `Validators.pattern()` to\n   * validate the value against a different pattern.\n   *\n   * @usageNotes\n   *\n   * ### Validate that the field matches a valid email pattern\n   *\n   * ```typescript\n   * const control = new FormControl('bad@', Validators.email);\n   *\n   * console.log(control.errors); // {email: true}\n   * ```\n   *\n   * @returns An error map with the `email` property\n   * if the validation check fails, otherwise `null`.\n   *\n   * @see `updateValueAndValidity()`\n   *\n   */\n  static email(control: AbstractControl): ValidationErrors|null {\n    return emailValidator(control);\n  }\n\n  /**\n   * @description\n   * Validator that requires the length of the control's value to be greater than or equal\n   * to the provided minimum length. This validator is also provided by default if you use the\n   * the HTML5 `minlength` attribute. Note that the `minLength` validator is intended to be used\n   * only for types that have a numeric `length` property, such as strings or arrays. The\n   * `minLength` validator logic is also not invoked for values when their `length` property is 0\n   * (for example in case of an empty string or an empty array), to support optional controls. You\n   * can use the standard `required` validator if empty values should not be considered valid.\n   *\n   * @usageNotes\n   *\n   * ### Validate that the field has a minimum of 3 characters\n   *\n   * ```typescript\n   * const control = new FormControl('ng', Validators.minLength(3));\n   *\n   * console.log(control.errors); // {minlength: {requiredLength: 3, actualLength: 2}}\n   * ```\n   *\n   * ```html\n   * <input minlength=\"5\">\n   * ```\n   *\n   * @returns A validator function that returns an error map with the\n   * `minlength` property if the validation check fails, otherwise `null`.\n   *\n   * @see `updateValueAndValidity()`\n   *\n   */\n  static minLength(minLength: number): ValidatorFn {\n    return minLengthValidator(minLength);\n  }\n\n  /**\n   * @description\n   * Validator that requires the length of the control's value to be less than or equal\n   * to the provided maximum length. This validator is also provided by default if you use the\n   * the HTML5 `maxlength` attribute. Note that the `maxLength` validator is intended to be used\n   * only for types that have a numeric `length` property, such as strings or arrays.\n   *\n   * @usageNotes\n   *\n   * ### Validate that the field has maximum of 5 characters\n   *\n   * ```typescript\n   * const control = new FormControl('Angular', Validators.maxLength(5));\n   *\n   * console.log(control.errors); // {maxlength: {requiredLength: 5, actualLength: 7}}\n   * ```\n   *\n   * ```html\n   * <input maxlength=\"5\">\n   * ```\n   *\n   * @returns A validator function that returns an error map with the\n   * `maxlength` property if the validation check fails, otherwise `null`.\n   *\n   * @see `updateValueAndValidity()`\n   *\n   */\n  static maxLength(maxLength: number): ValidatorFn {\n    return maxLengthValidator(maxLength);\n  }\n\n  /**\n   * @description\n   * Validator that requires the control's value to match a regex pattern. This validator is also\n   * provided by default if you use the HTML5 `pattern` attribute.\n   *\n   * @usageNotes\n   *\n   * ### Validate that the field only contains letters or spaces\n   *\n   * ```typescript\n   * const control = new FormControl('1', Validators.pattern('[a-zA-Z ]*'));\n   *\n   * console.log(control.errors); // {pattern: {requiredPattern: '^[a-zA-Z ]*$', actualValue: '1'}}\n   * ```\n   *\n   * ```html\n   * <input pattern=\"[a-zA-Z ]*\">\n   * ```\n   *\n   * ### Pattern matching with the global or sticky flag\n   *\n   * `RegExp` objects created with the `g` or `y` flags that are passed into `Validators.pattern`\n   * can produce different results on the same input when validations are run consecutively. This is\n   * due to how the behavior of `RegExp.prototype.test` is\n   * specified in [ECMA-262](https://tc39.es/ecma262/#sec-regexpbuiltinexec)\n   * (`RegExp` preserves the index of the last match when the global or sticky flag is used).\n   * Due to this behavior, it is recommended that when using\n   * `Validators.pattern` you **do not** pass in a `RegExp` object with either the global or sticky\n   * flag enabled.\n   *\n   * ```typescript\n   * // Not recommended (since the `g` flag is used)\n   * const controlOne = new FormControl('1', Validators.pattern(/foo/g));\n   *\n   * // Good\n   * const controlTwo = new FormControl('1', Validators.pattern(/foo/));\n   * ```\n   *\n   * @param pattern A regular expression to be used as is to test the values, or a string.\n   * If a string is passed, the `^` character is prepended and the `$` character is\n   * appended to the provided string (if not already present), and the resulting regular\n   * expression is used to test the values.\n   *\n   * @returns A validator function that returns an error map with the\n   * `pattern` property if the validation check fails, otherwise `null`.\n   *\n   * @see `updateValueAndValidity()`\n   *\n   */\n  static pattern(pattern: string|RegExp): ValidatorFn {\n    return patternValidator(pattern);\n  }\n\n  /**\n   * @description\n   * Validator that performs no operation.\n   *\n   * @see `updateValueAndValidity()`\n   *\n   */\n  static nullValidator(control: AbstractControl): ValidationErrors|null {\n    return nullValidator(control);\n  }\n\n  /**\n   * @description\n   * Compose multiple validators into a single function that returns the union\n   * of the individual error maps for the provided control.\n   *\n   * @returns A validator function that returns an error map with the\n   * merged error maps of the validators if the validation check fails, otherwise `null`.\n   *\n   * @see `updateValueAndValidity()`\n   *\n   */\n  static compose(validators: null): null;\n  static compose(validators: (ValidatorFn|null|undefined)[]): ValidatorFn|null;\n  static compose(validators: (ValidatorFn|null|undefined)[]|null): ValidatorFn|null {\n    return compose(validators);\n  }\n\n  /**\n   * @description\n   * Compose multiple async validators into a single function that returns the union\n   * of the individual error objects for the provided control.\n   *\n   * @returns A validator function that returns an error map with the\n   * merged error objects of the async validators if the validation check fails, otherwise `null`.\n   *\n   * @see `updateValueAndValidity()`\n   *\n   */\n  static composeAsync(validators: (AsyncValidatorFn|null)[]): AsyncValidatorFn|null {\n    return composeAsync(validators);\n  }\n}\n\n/**\n * Validator that requires the control's value to be greater than or equal to the provided number.\n * See `Validators.min` for additional information.\n */\nexport function minValidator(min: number): ValidatorFn {\n  return (control: AbstractControl): ValidationErrors|null => {\n    if (isEmptyInputValue(control.value) || isEmptyInputValue(min)) {\n      return null;  // don't validate empty values to allow optional controls\n    }\n    const value = parseFloat(control.value);\n    // Controls with NaN values after parsing should be treated as not having a\n    // minimum, per the HTML forms spec: https://www.w3.org/TR/html5/forms.html#attr-input-min\n    return !isNaN(value) && value < min ? {'min': {'min': min, 'actual': control.value}} : null;\n  };\n}\n\n/**\n * Validator that requires the control's value to be less than or equal to the provided number.\n * See `Validators.max` for additional information.\n */\nexport function maxValidator(max: number): ValidatorFn {\n  return (control: AbstractControl): ValidationErrors|null => {\n    if (isEmptyInputValue(control.value) || isEmptyInputValue(max)) {\n      return null;  // don't validate empty values to allow optional controls\n    }\n    const value = parseFloat(control.value);\n    // Controls with NaN values after parsing should be treated as not having a\n    // maximum, per the HTML forms spec: https://www.w3.org/TR/html5/forms.html#attr-input-max\n    return !isNaN(value) && value > max ? {'max': {'max': max, 'actual': control.value}} : null;\n  };\n}\n\n/**\n * Validator that requires the control have a non-empty value.\n * See `Validators.required` for additional information.\n */\nexport function requiredValidator(control: AbstractControl): ValidationErrors|null {\n  return isEmptyInputValue(control.value) ? {'required': true} : null;\n}\n\n/**\n * Validator that requires the control's value be true. This validator is commonly\n * used for required checkboxes.\n * See `Validators.requiredTrue` for additional information.\n */\nexport function requiredTrueValidator(control: AbstractControl): ValidationErrors|null {\n  return control.value === true ? null : {'required': true};\n}\n\n/**\n * Validator that requires the control's value pass an email validation test.\n * See `Validators.email` for additional information.\n */\nexport function emailValidator(control: AbstractControl): ValidationErrors|null {\n  if (isEmptyInputValue(control.value)) {\n    return null;  // don't validate empty values to allow optional controls\n  }\n  return EMAIL_REGEXP.test(control.value) ? null : {'email': true};\n}\n\n/**\n * Validator that requires the length of the control's value to be greater than or equal\n * to the provided minimum length. See `Validators.minLength` for additional information.\n */\nexport function minLengthValidator(minLength: number): ValidatorFn {\n  return (control: AbstractControl): ValidationErrors|null => {\n    if (isEmptyInputValue(control.value) || !hasValidLength(control.value)) {\n      // don't validate empty values to allow optional controls\n      // don't validate values without `length` property\n      return null;\n    }\n\n    return control.value.length < minLength ?\n        {'minlength': {'requiredLength': minLength, 'actualLength': control.value.length}} :\n        null;\n  };\n}\n\n/**\n * Validator that requires the length of the control's value to be less than or equal\n * to the provided maximum length. See `Validators.maxLength` for additional information.\n */\nexport function maxLengthValidator(maxLength: number): ValidatorFn {\n  return (control: AbstractControl): ValidationErrors|null => {\n    return hasValidLength(control.value) && control.value.length > maxLength ?\n        {'maxlength': {'requiredLength': maxLength, 'actualLength': control.value.length}} :\n        null;\n  };\n}\n\n/**\n * Validator that requires the control's value to match a regex pattern.\n * See `Validators.pattern` for additional information.\n */\nexport function patternValidator(pattern: string|RegExp): ValidatorFn {\n  if (!pattern) return nullValidator;\n  let regex: RegExp;\n  let regexStr: string;\n  if (typeof pattern === 'string') {\n    regexStr = '';\n\n    if (pattern.charAt(0) !== '^') regexStr += '^';\n\n    regexStr += pattern;\n\n    if (pattern.charAt(pattern.length - 1) !== '$') regexStr += '$';\n\n    regex = new RegExp(regexStr);\n  } else {\n    regexStr = pattern.toString();\n    regex = pattern;\n  }\n  return (control: AbstractControl): ValidationErrors|null => {\n    if (isEmptyInputValue(control.value)) {\n      return null;  // don't validate empty values to allow optional controls\n    }\n    const value: string = control.value;\n    return regex.test(value) ? null :\n                               {'pattern': {'requiredPattern': regexStr, 'actualValue': value}};\n  };\n}\n\n/**\n * Function that has `ValidatorFn` shape, but performs no operation.\n */\nexport function nullValidator(control: AbstractControl): ValidationErrors|null {\n  return null;\n}\n\nfunction isPresent(o: any): boolean {\n  return o != null;\n}\n\nexport function toObservable(r: any): Observable<any> {\n  const obs = isPromise(r) ? from(r) : r;\n  if (!(isObservable(obs)) && (typeof ngDevMode === 'undefined' || ngDevMode)) {\n    throw new Error(`Expected validator to return Promise or Observable.`);\n  }\n  return obs;\n}\n\nfunction mergeErrors(arrayOfErrors: (ValidationErrors|null)[]): ValidationErrors|null {\n  let res: {[key: string]: any} = {};\n\n  // Not using Array.reduce here due to a Chrome 80 bug\n  // https://bugs.chromium.org/p/chromium/issues/detail?id=1049982\n  arrayOfErrors.forEach((errors: ValidationErrors|null) => {\n    res = errors != null ? {...res!, ...errors} : res!;\n  });\n\n  return Object.keys(res).length === 0 ? null : res;\n}\n\ntype GenericValidatorFn = (control: AbstractControl) => any;\n\nfunction executeValidators<V extends GenericValidatorFn>(\n    control: AbstractControl, validators: V[]): ReturnType<V>[] {\n  return validators.map(validator => validator(control));\n}\n\nfunction isValidatorFn<V>(validator: V|Validator|AsyncValidator): validator is V {\n  return !(validator as Validator).validate;\n}\n\n/**\n * Given the list of validators that may contain both functions as well as classes, return the list\n * of validator functions (convert validator classes into validator functions). This is needed to\n * have consistent structure in validators list before composing them.\n *\n * @param validators The set of validators that may contain validators both in plain function form\n *     as well as represented as a validator class.\n */\nexport function normalizeValidators<V>(validators: (V|Validator|AsyncValidator)[]): V[] {\n  return validators.map(validator => {\n    return isValidatorFn<V>(validator) ?\n        validator :\n        ((c: AbstractControl) => validator.validate(c)) as unknown as V;\n  });\n}\n\n/**\n * Merges synchronous validators into a single validator function.\n * See `Validators.compose` for additional information.\n */\nfunction compose(validators: (ValidatorFn|null|undefined)[]|null): ValidatorFn|null {\n  if (!validators) return null;\n  const presentValidators: ValidatorFn[] = validators.filter(isPresent) as any;\n  if (presentValidators.length == 0) return null;\n\n  return function(control: AbstractControl) {\n    return mergeErrors(executeValidators<ValidatorFn>(control, presentValidators));\n  };\n}\n\n/**\n * Accepts a list of validators of different possible shapes (`Validator` and `ValidatorFn`),\n * normalizes the list (converts everything to `ValidatorFn`) and merges them into a single\n * validator function.\n */\nexport function composeValidators(validators: Array<Validator|ValidatorFn>): ValidatorFn|null {\n  return validators != null ? compose(normalizeValidators<ValidatorFn>(validators)) : null;\n}\n\n/**\n * Merges asynchronous validators into a single validator function.\n * See `Validators.composeAsync` for additional information.\n */\nfunction composeAsync(validators: (AsyncValidatorFn|null)[]): AsyncValidatorFn|null {\n  if (!validators) return null;\n  const presentValidators: AsyncValidatorFn[] = validators.filter(isPresent) as any;\n  if (presentValidators.length == 0) return null;\n\n  return function(control: AbstractControl) {\n    const observables =\n        executeValidators<AsyncValidatorFn>(control, presentValidators).map(toObservable);\n    return forkJoin(observables).pipe(map(mergeErrors));\n  };\n}\n\n/**\n * Accepts a list of async validators of different possible shapes (`AsyncValidator` and\n * `AsyncValidatorFn`), normalizes the list (converts everything to `AsyncValidatorFn`) and merges\n * them into a single validator function.\n */\nexport function composeAsyncValidators(validators: Array<AsyncValidator|AsyncValidatorFn>):\n    AsyncValidatorFn|null {\n  return validators != null ? composeAsync(normalizeValidators<AsyncValidatorFn>(validators)) :\n                              null;\n}\n\n/**\n * Merges raw control validators with a given directive validator and returns the combined list of\n * validators as an array.\n */\nexport function mergeValidators<V>(controlValidators: V|V[]|null, dirValidator: V): V[] {\n  if (controlValidators === null) return [dirValidator];\n  return Array.isArray(controlValidators) ? [...controlValidators, dirValidator] :\n                                            [controlValidators, dirValidator];\n}\n\n/**\n * Retrieves the list of raw synchronous validators attached to a given control.\n */\nexport function getControlValidators(control: AbstractControl): ValidatorFn|ValidatorFn[]|null {\n  return (control as any)._rawValidators as ValidatorFn | ValidatorFn[] | null;\n}\n\n/**\n * Retrieves the list of raw asynchronous validators attached to a given control.\n */\nexport function getControlAsyncValidators(control: AbstractControl): AsyncValidatorFn|\n    AsyncValidatorFn[]|null {\n  return (control as any)._rawAsyncValidators as AsyncValidatorFn | AsyncValidatorFn[] | null;\n}\n\n/**\n * Accepts a singleton validator, an array, or null, and returns an array type with the provided\n * validators.\n *\n * @param validators A validator, validators, or null.\n * @returns A validators array.\n */\nexport function makeValidatorsArray<T extends ValidatorFn|AsyncValidatorFn>(validators: T|T[]|\n                                                                            null): T[] {\n  if (!validators) return [];\n  return Array.isArray(validators) ? validators : [validators];\n}\n\n/**\n * Determines whether a validator or validators array has a given validator.\n *\n * @param validators The validator or validators to compare against.\n * @param validator The validator to check.\n * @returns Whether the validator is present.\n */\nexport function hasValidator<T extends ValidatorFn|AsyncValidatorFn>(\n    validators: T|T[]|null, validator: T): boolean {\n  return Array.isArray(validators) ? validators.includes(validator) : validators === validator;\n}\n\n/**\n * Combines two arrays of validators into one. If duplicates are provided, only one will be added.\n *\n * @param validators The new validators.\n * @param currentValidators The base array of currrent validators.\n * @returns An array of validators.\n */\nexport function addValidators<T extends ValidatorFn|AsyncValidatorFn>(\n    validators: T|T[], currentValidators: T|T[]|null): T[] {\n  const current = makeValidatorsArray(currentValidators);\n  const validatorsToAdd = makeValidatorsArray(validators);\n  validatorsToAdd.forEach((v: T) => {\n    // Note: if there are duplicate entries in the new validators array,\n    // only the first one would be added to the current list of validarors.\n    // Duplicate ones would be ignored since `hasValidator` would detect\n    // the presence of a validator function and we update the current list in place.\n    if (!hasValidator(current, v)) {\n      current.push(v);\n    }\n  });\n  return current;\n}\n\nexport function removeValidators<T extends ValidatorFn|AsyncValidatorFn>(\n    validators: T|T[], currentValidators: T|T[]|null): T[] {\n  return makeValidatorsArray(currentValidators).filter(v => !hasValidator(validators, v));\n}\n"]} |
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