basecomparevalidator.cs source code in C# .NET

Source code for the .NET framework in C#

                        
Code:

                         / DotNET / DotNET / 8.0 / untmp / whidbey / REDBITS / ndp / fx / src / xsp / System / Web / UI / WebControls / basecomparevalidator.cs / 1 / basecomparevalidator.cs
                        

                        
                            //------------------------------------------------------------------------------ 
// 
//     Copyright (c) Microsoft Corporation.  All rights reserved.
// 
//----------------------------------------------------------------------------- 

namespace System.Web.UI.WebControls { 
 
    using System.ComponentModel;
    using System.Drawing; 
    using System.Globalization;
    using System.Web;
    using System.Web.UI.HtmlControls;
    using System.Text.RegularExpressions; 
    using System.Text;
    using System.Security.Permissions; 
    using System.Web.Util; 

 
    /// 
    ///     Serves as the abstract base
    ///       class for validators that do typed comparisons.
    ///  
    [AspNetHostingPermission(SecurityAction.LinkDemand, Level=AspNetHostingPermissionLevel.Minimal)]
    [AspNetHostingPermission(SecurityAction.InheritanceDemand, Level=AspNetHostingPermissionLevel.Minimal)] 
    public abstract class BaseCompareValidator : BaseValidator { 

 
        /// 
        ///    Gets or sets the data type that specifies how the values
        ///       being compared should be interpreted.
        ///  
        [
        WebCategory("Behavior"), 
        Themeable(false), 
        DefaultValue(ValidationDataType.String),
        WebSysDescription(SR.RangeValidator_Type) 
        ]
        public ValidationDataType Type {
            get {
                object o = ViewState["Type"]; 
                return((o == null) ? ValidationDataType.String : (ValidationDataType)o);
            } 
            set { 
                if (value < ValidationDataType.String || value > ValidationDataType.Currency) {
                    throw new ArgumentOutOfRangeException("value"); 
                }
                ViewState["Type"] = value;
            }
        } 

 
        ///  
        ///     Whether we should do culture invariant conversion against the
        ///     string value properties on the control 
        /// 
        [
        WebCategory("Behavior"),
        Themeable(false), 
        DefaultValue(false),
        WebSysDescription(SR.BaseCompareValidator_CultureInvariantValues) 
        ] 
        public bool CultureInvariantValues {
            get { 
                object o = ViewState["CultureInvariantValues"];
                return((o == null) ? false : (bool)o);
            }
            set { 
                ViewState["CultureInvariantValues"] = value;
            } 
        } 

 
        /// 
        /// 
        ///    AddAttributesToRender method
        ///  
        protected override void AddAttributesToRender(HtmlTextWriter writer) {
            base.AddAttributesToRender(writer); 
            if (RenderUplevel) { 
                ValidationDataType type = Type;
                if (type != ValidationDataType.String) { 
                    string id = ClientID;
                    HtmlTextWriter expandoAttributeWriter = (EnableLegacyRendering) ? writer : null;

                    AddExpandoAttribute(expandoAttributeWriter, id, "type", PropertyConverter.EnumToString(typeof(ValidationDataType), type), false); 

                    NumberFormatInfo info = NumberFormatInfo.CurrentInfo; 
                    if (type == ValidationDataType.Double) { 
                        string decimalChar = info.NumberDecimalSeparator;
                        AddExpandoAttribute(expandoAttributeWriter, id, "decimalchar", decimalChar); 
                    }
                    else if (type == ValidationDataType.Currency) {
                        string decimalChar = info.CurrencyDecimalSeparator;
                        AddExpandoAttribute(expandoAttributeWriter, id, "decimalchar", decimalChar); 

                        string groupChar = info.CurrencyGroupSeparator; 
                        // Map non-break space onto regular space for parsing 
                        if (groupChar[0] == 160)
                            groupChar = " "; 
                        AddExpandoAttribute(expandoAttributeWriter, id, "groupchar", groupChar);

                        int digits = info.CurrencyDecimalDigits;
                        AddExpandoAttribute(expandoAttributeWriter, id, "digits", digits.ToString(NumberFormatInfo.InvariantInfo), false); 

                        // VSWhidbey 83165 
                        int groupSize = GetCurrencyGroupSize(info); 
                        if (groupSize > 0) {
                            AddExpandoAttribute(expandoAttributeWriter, id, "groupsize", groupSize.ToString(NumberFormatInfo.InvariantInfo), false); 
                        }
                    }
                    else if (type == ValidationDataType.Date) {
                        AddExpandoAttribute(expandoAttributeWriter, id, "dateorder", GetDateElementOrder(), false); 
                        AddExpandoAttribute(expandoAttributeWriter, id, "cutoffyear", CutoffYear.ToString(NumberFormatInfo.InvariantInfo), false);
 
                        // VSWhidbey 504553: The changes of this bug make client-side script not 
                        // using the century attribute anymore, but still generating it for
                        // backward compatibility with Everett pages. 
                        int currentYear = DateTime.Today.Year;
                        int century = currentYear - (currentYear % 100);
                        AddExpandoAttribute(expandoAttributeWriter, id, "century", century.ToString(NumberFormatInfo.InvariantInfo), false);
                    } 
                }
            } 
        } 

 

        /// 
        ///    Check if the text can be converted to the type
        ///  
        public static bool CanConvert(string text, ValidationDataType type) {
            return CanConvert(text, type, false); 
        } 

 
        public static bool CanConvert(string text, ValidationDataType type, bool cultureInvariant) {
            object value = null;
            return Convert(text, type, cultureInvariant, out value);
        } 

 
        ///  
        /// 
        ///    Return the order of date elements for the current culture 
        /// 
        protected static string GetDateElementOrder() {
            DateTimeFormatInfo info = DateTimeFormatInfo.CurrentInfo;
            string shortPattern = info.ShortDatePattern; 
            if (shortPattern.IndexOf('y') < shortPattern.IndexOf('M')) {
                return "ymd"; 
            } 
            else if (shortPattern.IndexOf('M') < shortPattern.IndexOf('d')) {
                return "mdy"; 
            }
            else {
                return "dmy";
            } 
        }
 
        // VSWhidbey 83165 
        private static int GetCurrencyGroupSize(NumberFormatInfo info) {
            int [] groupSizes = info.CurrencyGroupSizes; 
            if (groupSizes != null && groupSizes.Length == 1) {
                return groupSizes[0];
            }
            else { 
                return -1;
            } 
        } 

 
        /// 
        ///    [To be supplied.]
        /// 
        protected static int CutoffYear { 
            get {
                return DateTimeFormatInfo.CurrentInfo.Calendar.TwoDigitYearMax; 
            } 
        }
 

        /// 
        ///    [To be supplied.]
        ///  
        protected static int GetFullYear(int shortYear) {
            Debug.Assert(shortYear >= 0 && shortYear < 100); 
            return DateTimeFormatInfo.CurrentInfo.Calendar.ToFourDigitYear(shortYear); 
        }
 

        /// 
        ///    Try to convert the test into the validation data type
        ///  
        protected static bool Convert(string text, ValidationDataType type, out object value) {
            return Convert(text, type, false, out value); 
        } 

 
        protected static bool Convert(string text, ValidationDataType type, bool cultureInvariant, out object value) {

            value = null;
            try { 
                switch (type) {
                    case ValidationDataType.String: 
                        value = text; 
                        break;
 
                    case ValidationDataType.Integer:
                        value = Int32.Parse(text, CultureInfo.InvariantCulture);
                        break;
 
                    case ValidationDataType.Double: {
                        string cleanInput; 
                        if (cultureInvariant) { 
                            cleanInput = ConvertDouble(text, CultureInfo.InvariantCulture.NumberFormat);
                        } 
                        else {
                            cleanInput = ConvertDouble(text, NumberFormatInfo.CurrentInfo);
                        }
 
                        if (cleanInput != null) {
                            value = Double.Parse(cleanInput, CultureInfo.InvariantCulture); 
                        } 
                        break;
                    } 

                    case ValidationDataType.Date: {
                        if (cultureInvariant) {
                            value = ConvertDate(text, "ymd"); 
                        }
                        else { 
                            // if the calendar is not gregorian, we should not enable client-side, so just parse it directly: 
                            if (!(DateTimeFormatInfo.CurrentInfo.Calendar.GetType() == typeof(GregorianCalendar))) {
                                value = DateTime.Parse(text, CultureInfo.CurrentCulture); 
                                break;
                            }

                            string dateElementOrder = GetDateElementOrder(); 
                            value = ConvertDate(text, dateElementOrder);
                        } 
                        break; 
                    }
 
                    case ValidationDataType.Currency: {
                        string cleanInput;
                        if (cultureInvariant) {
                            cleanInput = ConvertCurrency(text, CultureInfo.InvariantCulture.NumberFormat); 
                        }
                        else { 
                            cleanInput = ConvertCurrency(text, NumberFormatInfo.CurrentInfo); 
                        }
 
                        if (cleanInput != null) {
                            value = Decimal.Parse(cleanInput, CultureInfo.InvariantCulture);
                        }
                        break; 
                    }
                } 
            } 
            catch {
                value = null; 
            }
            return (value != null);
        }
 
        private static string ConvertCurrency(string text, NumberFormatInfo info) {
            string decimalChar = info.CurrencyDecimalSeparator; 
            string groupChar = info.CurrencyGroupSeparator; 

            // VSWhidbey 83165 
            string beginGroupSize, subsequentGroupSize;
            int groupSize = GetCurrencyGroupSize(info);
            if (groupSize > 0) {
                string groupSizeText = groupSize.ToString(NumberFormatInfo.InvariantInfo); 
                beginGroupSize = "{1," + groupSizeText + "}";
                subsequentGroupSize = "{" + groupSizeText + "}"; 
            } 
            else {
                beginGroupSize = subsequentGroupSize = "+"; 
            }

            // Map non-break space onto regular space for parsing
            if (groupChar[0] == 160) 
                groupChar = " ";
            int digits = info.CurrencyDecimalDigits; 
            bool hasDigits = (digits > 0); 
            string currencyExpression =
                "^\\s*([-\\+])?((\\d" + beginGroupSize + "(\\" + groupChar + "\\d" + subsequentGroupSize + ")+)|\\d*)" 
                + (hasDigits ? "\\" + decimalChar + "?(\\d{0," + digits.ToString(NumberFormatInfo.InvariantInfo) + "})" : string.Empty)
                + "\\s*$";

            Match m = Regex.Match(text, currencyExpression); 
            if (!m.Success) {
                return null; 
            } 

            // Make sure there are some valid digits 
            if (m.Groups[2].Length == 0 && hasDigits && m.Groups[5].Length == 0) {
                return null;
            }
 
            return m.Groups[1].Value
                   + m.Groups[2].Value.Replace(groupChar, string.Empty) 
                   + ((hasDigits && m.Groups[5].Length > 0) ? "." + m.Groups[5].Value : string.Empty); 
        }
 
        private static string ConvertDouble(string text, NumberFormatInfo info) {
            // VSWhidbey 83156: If text is empty, it would be default to 0 for
            // backward compatibility reason.
            if (text.Length == 0) { 
                return "0";
            } 
 
            string decimalChar = info.NumberDecimalSeparator;
            string doubleExpression = "^\\s*([-\\+])?(\\d*)\\" + decimalChar + "?(\\d*)\\s*$"; 

            Match m = Regex.Match(text, doubleExpression);
            if (!m.Success) {
                return null; 
            }
 
            // Make sure there are some valid digits 
            if (m.Groups[2].Length == 0 && m.Groups[3].Length == 0) {
                return null; 
            }

            return m.Groups[1].Value
                   + (m.Groups[2].Length > 0 ? m.Groups[2].Value : "0") 
                   + ((m.Groups[3].Length > 0) ? "." + m.Groups[3].Value: string.Empty);
        } 
 
        private static object ConvertDate(string text, string dateElementOrder) {
            // always allow the YMD format, if they specify 4 digits 
            string dateYearFirstExpression = "^\\s*((\\d{4})|(\\d{2}))([-/]|\\. ?)(\\d{1,2})\\4(\\d{1,2})\\s*$";
            Match m = Regex.Match(text, dateYearFirstExpression);
            int day, month, year;
            if (m.Success && (m.Groups[2].Success || dateElementOrder == "ymd")) { 
                day = Int32.Parse(m.Groups[6].Value, CultureInfo.InvariantCulture);
                month = Int32.Parse(m.Groups[5].Value, CultureInfo.InvariantCulture); 
                if (m.Groups[2].Success) { 
                    year = Int32.Parse(m.Groups[2].Value, CultureInfo.InvariantCulture);
                } 
                else {
                    year = GetFullYear(Int32.Parse(m.Groups[3].Value, CultureInfo.InvariantCulture));
                }
            } 
            else {
                if (dateElementOrder == "ymd") { 
                    return null; 
                }
 
                // also check for the year last format
                string dateYearLastExpression = "^\\s*(\\d{1,2})([-/]|\\. ?)(\\d{1,2})\\2((\\d{4})|(\\d{2}))\\s*$";
                m = Regex.Match(text, dateYearLastExpression);
                if (!m.Success) { 
                    return null;
                } 
                if (dateElementOrder == "mdy") { 
                    day = Int32.Parse(m.Groups[3].Value, CultureInfo.InvariantCulture);
                    month = Int32.Parse(m.Groups[1].Value, CultureInfo.InvariantCulture); 
                }
                else {
                    day = Int32.Parse(m.Groups[1].Value, CultureInfo.InvariantCulture);
                    month = Int32.Parse(m.Groups[3].Value, CultureInfo.InvariantCulture); 
                }
                if (m.Groups[5].Success) { 
                    year = Int32.Parse(m.Groups[5].Value, CultureInfo.InvariantCulture); 
                } else {
                    year = GetFullYear(Int32.Parse(m.Groups[6].Value, CultureInfo.InvariantCulture)); 
                }
            }
            return new DateTime(year, month, day);
        } 

 
        ///  
        ///    Compare two strings using the type and operator
        ///  
        protected static bool Compare(string leftText, string rightText, ValidationCompareOperator op, ValidationDataType type) {
            return Compare(leftText, false, rightText, false, op, type);
        }
 

        protected static bool Compare(string leftText, bool cultureInvariantLeftText, 
                                      string rightText, bool cultureInvariantRightText, 
                                      ValidationCompareOperator op, ValidationDataType type) {
            object leftObject; 
            if (!Convert(leftText, type, cultureInvariantLeftText, out leftObject))
                return false;

            if (op == ValidationCompareOperator.DataTypeCheck) 
                return true;
 
            object rightObject; 
            if (!Convert(rightText, type, cultureInvariantRightText, out rightObject))
                return true; 

            int compareResult;
            switch (type) {
                case ValidationDataType.String: 
                    compareResult = String.Compare((string)leftObject, (string) rightObject, false, CultureInfo.CurrentCulture);
                    break; 
 
                case ValidationDataType.Integer:
                    compareResult = ((int)leftObject).CompareTo(rightObject); 
                    break;

                case ValidationDataType.Double:
                    compareResult = ((double)leftObject).CompareTo(rightObject); 
                    break;
 
                case ValidationDataType.Date: 
                    compareResult = ((DateTime)leftObject).CompareTo(rightObject);
                    break; 

                case ValidationDataType.Currency:
                    compareResult = ((Decimal)leftObject).CompareTo(rightObject);
                    break; 

                default: 
                    Debug.Fail("Unknown Type"); 
                    return true;
            } 

            switch (op) {
                case ValidationCompareOperator.Equal:
                    return compareResult == 0; 
                case ValidationCompareOperator.NotEqual:
                    return compareResult != 0; 
                case ValidationCompareOperator.GreaterThan: 
                    return compareResult > 0 ;
                case ValidationCompareOperator.GreaterThanEqual: 
                    return compareResult >= 0 ;
                case ValidationCompareOperator.LessThan:
                    return compareResult < 0 ;
                case ValidationCompareOperator.LessThanEqual: 
                    return compareResult <= 0 ;
                default: 
                    Debug.Fail("Unknown Operator"); 
                    return true;
            } 
        }


        ///  
        ///    [To be supplied.]
        ///  
        protected override bool DetermineRenderUplevel() { 
            // We don't do client-side validation for dates with non gregorian calendars
            if (Type == ValidationDataType.Date && DateTimeFormatInfo.CurrentInfo.Calendar.GetType() != typeof(GregorianCalendar)) { 
                return false;
            }
            return base.DetermineRenderUplevel();
        } 

        internal string ConvertToShortDateString(string text) { 
            // VSWhidbey 83099, 85305, we should ignore error if it happens and 
            // leave text as intact when parsing the date.  We assume the caller
            // (validator) is able to handle invalid text itself. 
            DateTime date;
            if (DateTime.TryParse(text, CultureInfo.CurrentCulture, DateTimeStyles.None, out date)) {
                text = date.ToShortDateString();
            } 
            return text;
        } 
 
        internal bool IsInStandardDateFormat(string date) {
            // VSWhidbey 115454: We identify that date string with only numbers 
            // and specific punctuation separators is in standard date format.
            const string standardDateExpression = "^\\s*(\\d+)([-/]|\\. ?)(\\d+)\\2(\\d+)\\s*$";
            return Regex.Match(date, standardDateExpression).Success;
        } 

        internal string ConvertCultureInvariantToCurrentCultureFormat(string valueInString, 
                                                                      ValidationDataType type) { 
            object value;
            Convert(valueInString, type, true, out value); 
            if (value is DateTime) {
                // For Date type we explicitly want the date portion only
                return ((DateTime) value).ToShortDateString();
            } 
            else {
                return System.Convert.ToString(value, CultureInfo.CurrentCulture); 
            } 
        }
    } 
}

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