ng-rules-composite-rule.ts

import { CompositeRule } from './CompositeRule';
import { IsNotNullOrUndefined } from './IsNotNullOrUndefined';
import { IsTrue } from './IsTrue';

/**
 * Use this rule to determine if the string value matches the specified
 * regular expression.
 */
export class StringIsRegExMatch extends CompositeRule {
  /**
   * The constructor for the [IsNotNullOrUndefined] rule.
   * @param name The name of the rule.
   * @param message The message to display when the rule is violated.
   * @param target The target that the rules are evaluated against.
   * @param isDisplayable: Indicates if the rule violation is displayable. Default value is [false].
   */
  constructor(name: string, message: string, private target: string, private expression: RegExp, isDisplayable: boolean) {
    super(name, message, isDisplayable);
    this.configureRules();
  }

  /**
   * Use to configure the rules to be evaluated.
   */
  private configureRules() {
    const showRuleViolations = true;
    const doNotShowRuleViolation = false;

    // determine if the target is a valid object;
    this.rules.push(
      new IsNotNullOrUndefined('StringIsNotNullOrUndefined', 'The target value is null or undefined.', this.target, doNotShowRuleViolation)
    );
    if (this.target) {
      this.rules.push(
        new IsTrue('StringIsRegExpMatch', 'The target value is not a match.', this.expression.test(this.target), doNotShowRuleViolation)
      );
    }
  }
}