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BaseRouteProvider.cs

using Nop.Core.Domain.Localization;
using Nop.Core.Infrastructure;
using Nop.Data;
using Nop.Web.Framework.Mvc.Routing;

namespace Nop.Web.Infrastructure;

/// 
/// Represents base provider
/// 
public partial class BaseRouteProvider
{
    /// 
    /// Get pattern used to detect routes with language code
    /// 
    /// 
    protected string GetLanguageRoutePattern()
    {
        if (DataSettingsManager.IsDatabaseInstalled())
        {
            var localizationSettings = EngineContext.Current.Resolve();
            if (localizationSettings.SeoFriendlyUrlsForLanguagesEnabled)
            {
                //this pattern is set once at the application start, when we don't have the selected language yet
                //so we use 'en' by default for the language value, later it'll be replaced with the working language code
                var code = "en";
                return $"{{{NopRoutingDefaults.RouteValue.Language}:maxlength(2):{NopRoutingDefaults.LanguageParameterTransformer}={code}}}";
            }
        }

        return string.Empty;
    }
}