Enable NumberFormatInfo netstandard 1.7 APIs (dotnet#7659)

* Enable NumberFormatInfo netstandard 1.7 APIs

* Remove ComVisible attributes

* Remove more ComVisible attributes

Author: tarekgh

src/mscorlib/corefx/SR.cs

@@ -179,6 +179,11 @@ public static string Argument_InvalidDateTimeStyles
             get { return Environment.GetResourceString("Argument_InvalidDateTimeStyles"); }
         }
 
+        public static string Argument_InvalidDigitSubstitution
+        {
+            get { return Environment.GetResourceString("Argument_InvalidDigitSubstitution"); }
+        }
+
         public static string Argument_InvalidFlag
         {
             get { return Environment.GetResourceString("Argument_InvalidFlag"); }
@@ -189,6 +194,16 @@ public static string Argument_InvalidGroupSize
             get { return Environment.GetResourceString("Argument_InvalidGroupSize"); }
         }
 
+        public static string Argument_InvalidNativeDigitCount
+        {
+            get { return Environment.GetResourceString("Argument_InvalidNativeDigitCount"); }
+        }
+
+        public static string Argument_InvalidNativeDigitValue
+        {
+            get { return Environment.GetResourceString("Argument_InvalidNativeDigitValue"); }
+        }
+
         public static string Argument_InvalidNeutralRegionName
         {
             get { return Environment.GetResourceString("Argument_InvalidNeutralRegionName"); }

src/mscorlib/corefx/System/Globalization/CultureData.Unix.cs

@@ -339,5 +339,11 @@ private static int GetGeoId(string cultureName)
             int geoId = LocaleData.GetLocaleDataNumericPart(cultureName, LocaleDataParts.GeoId);
             return geoId == -1 ? CultureData.Invariant.IGEOID : geoId; 
         }
+        
+        private static int GetDigitSubstitution(string cultureName)
+        {
+            int digitSubstitution = LocaleData.GetLocaleDataNumericPart(cultureName, LocaleDataParts.DigitSubstitution);
+            return digitSubstitution == -1 ? (int) DigitShapes.None : digitSubstitution; 
+        }
     }
 }

src/mscorlib/corefx/System/Globalization/CultureData.Windows.cs

@@ -592,5 +592,10 @@ private static int GetGeoId(string cultureName)
         {
             throw new NotImplementedException();
         }
+        
+        private static int GetDigitSubstitution(string cultureName)
+        {
+            throw new NotImplementedException();
+        }
     }
 }

src/mscorlib/corefx/System/Globalization/CultureData.cs

@@ -90,7 +90,6 @@ internal partial class CultureData
         // Numbers
         private String _sPositiveSign; // (user can override) positive sign
         private String _sNegativeSign; // (user can override) negative sign
-        private String[] _saNativeDigits; // (user can override) native characters for digits 0-9
         // (nfi populates these 5, don't have to be = undef)
         private int _iDigits; // (user can override) number of fractional digits
         private int _iNegativeNumber; // (user can override) negative number format
@@ -446,7 +445,6 @@ internal static CultureData Invariant
                     // Numbers
                     invariant._sPositiveSign = "+";                    // positive sign
                     invariant._sNegativeSign = "-";                    // negative sign
-                    invariant._saNativeDigits = new String[] { "0", "1", "2", "3", "4", "5", "6", "7", "8", "9" }; // native characters for digits 0-9
                     invariant._iDigits = 2;                      // number of fractional digits
                     invariant._iNegativeNumber = 1;                      // negative number format
                     invariant._waGrouping = new int[] { 3 };          // grouping of digits
@@ -1055,18 +1053,6 @@ internal String SISO3166CTRYNAME2
             }
         }
 
-        /////////////
-        // Numbers //
-        ////////////
-
-        //                internal String sPositiveSign            ; // (user can override) positive sign
-        //                internal String sNegativeSign            ; // (user can override) negative sign
-        //                internal String[] saNativeDigits         ; // (user can override) native characters for digits 0-9
-        //                internal int iDigits                  ; // (user can override) number of fractional digits
-        //                internal int iNegativeNumber          ; // (user can override) negative number format
-
-
-
         // (user can override) grouping of digits
         internal int[] WAGROUPING
         {
@@ -2101,7 +2087,6 @@ internal void GetNFIValues(NumberFormatInfo nfi)
             if (this.IsInvariantCulture)
             {
                 // FUTURE: NumberFormatInfo already has default values for many of these fields.  Can we not do this?
-                // if we do need to do this, then why don't we set nfi.nativeDigits in this case?
                 nfi.positiveSign = _sPositiveSign;
                 nfi.negativeSign = _sNegativeSign;
 
@@ -2144,6 +2129,8 @@ internal void GetNFIValues(NumberFormatInfo nfi)
                 {
                     nfi.nativeDigits[i] = new string(digits[i], 1);
                 }
+                
+                nfi.digitSubstitution = GetDigitSubstitution(_sRealName);
             }
 
             //

src/mscorlib/corefx/System/Globalization/DigitShapes.cs

@@ -0,0 +1,17 @@
+// Licensed to the .NET Foundation under one or more agreements.
+// The .NET Foundation licenses this file to you under the MIT license.
+// See the LICENSE file in the project root for more information.
+
+//
+// The enumeration constants used in NumberFormatInfo.DigitSubstitution.
+//
+namespace System.Globalization
+{
+    [Serializable]
+    public enum DigitShapes : int
+    {
+        Context         = 0x0000,   // The shape depends on the previous text in the same output.
+        None            = 0x0001,   // Gives full Unicode compatibility.
+        NativeNational  = 0x0002    // National shapes 
+    }
+}