ScriptStringParameterNode.cs

using System.Text.RegularExpressions;
using System.Threading.Tasks;
using Waher.Networking.XMPP.Concentrator;
using Waher.Networking.XMPP.DataForms;
using Waher.Networking.XMPP.DataForms.DataTypes;
using Waher.Networking.XMPP.DataForms.FieldTypes;
using Waher.Networking.XMPP.DataForms.Layout;
using Waher.Networking.XMPP.DataForms.ValidationMethods;
using Waher.Runtime.Language;
using Waher.Script;
using Waher.Things.Attributes;
 
namespace Waher.Things.Script.Parameters
{
    public class ScriptStringParameterNode : ScriptParameterNodeWithOptions
    {
        private string pattern = string.Empty;
        private Regex parsed = null;
 
        public ScriptStringParameterNode()
            : base()
        {
        }
 
        [Page(2, "Script", 100)]
        [Header(29, "Default value:")]
        [ToolTip(30, "Default value presented to user.")]
        public string DefaultValue { get; set; }
 
        [Page(2, "Script", 100)]
        [Header(31, "Pattern:")]
        [ToolTip(32, "Regular expression used for validating user input.")]
        public string Pattern
        {
            get => this.pattern;
            set
            {
                if (string.IsNullOrEmpty(value))
                {
                    this.pattern = null;
                    this.parsed = null;
                }
                else
                {
                    this.parsed = new Regex(value);
                    this.pattern = value;
                }
            }
        }
 
        public override Task<string> GetTypeNameAsync(Language Language)
        {
            return Language.GetStringAsync(typeof(ScriptNode), 35, "String-valued parameter");
        }
 
        public override async Task PopulateForm(DataForm Parameters, Language Language, object Value)
        {
            ValidationMethod Validation;
            Field Field;
 
            if (string.IsNullOrEmpty(this.Pattern))
                Validation = new OpenValidation();
            else
                Validation = new RegexValidation(this.Pattern);
 
            if (this.RestrictToOptions)
            {
                Field = new ListSingleField(Parameters, this.ParameterName, this.Label, this.Required,
                    new string[] { this.DefaultValue }, await this.GetOptions(), this.Description, StringDataType.Instance,
                    Validation, string.Empty, false, false, false);
            }
            else
            {
                Field = new TextSingleField(Parameters, this.ParameterName, this.Label, this.Required,
                    new string[] { this.DefaultValue }, await this.GetOptions(), this.Description, StringDataType.Instance,
                    Validation, string.Empty, false, false, false);
            }
 
            Parameters.Add(Field);
 
            Page Page = Parameters.GetPage(this.Page);
            Page.Add(Field);
        }
 
        public override async Task SetParameter(DataForm Parameters, Language Language, bool OnlySetChanged, Variables Values, 
            SetEditableFormResult Result)
        {
            Field Field = Parameters[this.ParameterName];
            if (Field is null)
            {
                if (this.Required)
                    Result.AddError(this.ParameterName, await Language.GetStringAsync(typeof(ScriptNode), 42, "Required parameter."));
 
                Values[this.ParameterName] = null;
            }
            else
            {
                string s = Field.ValueString;
 
                if (string.IsNullOrEmpty(s))
                {
                    if (this.Required)
                        Result.AddError(this.ParameterName, await Language.GetStringAsync(typeof(ScriptNode), 42, "Required parameter."));
 
                    Values[this.ParameterName] = null;
                }
                else
                {
                    Values[this.ParameterName] = s;
 
                    if (!(this.parsed is null))
                    {
                        Match M = this.parsed.Match(s);
 
                        if (!M.Success || M.Index > 0 || M.Length != s.Length)
                            Result.AddError(this.ParameterName, await Language.GetStringAsync(typeof(ScriptNode), 43, "Value does not match expected pattern."));
                    }
                }
            }
        }
 
    }
}