csharp-sdk-upm/Libs/Newtonsoft.Json/Utilities/ConvertUtils.cs

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#region License
// Copyright (c) 2007 James Newton-King
//
// Permission is hereby granted, free of charge, to any person
// obtaining a copy of this software and associated documentation
// files (the "Software"), to deal in the Software without
// restriction, including without limitation the rights to use,
// copy, modify, merge, publish, distribute, sublicense, and/or sell
// copies of the Software, and to permit persons to whom the
// Software is furnished to do so, subject to the following
// conditions:
//
// The above copyright notice and this permission notice shall be
// included in all copies or substantial portions of the Software.
//
// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
// EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES
// OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
// NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT
// HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY,
// WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
// FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
// OTHER DEALINGS IN THE SOFTWARE.
#endregion
using System;
using System.Collections.Generic;
using System.Globalization;
using System.ComponentModel;
#if HAVE_BIG_INTEGER
using System.Numerics;
#endif
#if !HAVE_GUID_TRY_PARSE
using System.Text;
using System.Text.RegularExpressions;
#endif
using LC.Newtonsoft.Json.Serialization;
using System.Reflection;
#if !HAVE_LINQ
using LC.Newtonsoft.Json.Utilities.LinqBridge;
#endif
#if HAVE_ADO_NET
using System.Data.SqlTypes;
#endif
namespace LC.Newtonsoft.Json.Utilities
{
internal enum PrimitiveTypeCode
{
Empty = 0,
Object = 1,
Char = 2,
CharNullable = 3,
Boolean = 4,
BooleanNullable = 5,
SByte = 6,
SByteNullable = 7,
Int16 = 8,
Int16Nullable = 9,
UInt16 = 10,
UInt16Nullable = 11,
Int32 = 12,
Int32Nullable = 13,
Byte = 14,
ByteNullable = 15,
UInt32 = 16,
UInt32Nullable = 17,
Int64 = 18,
Int64Nullable = 19,
UInt64 = 20,
UInt64Nullable = 21,
Single = 22,
SingleNullable = 23,
Double = 24,
DoubleNullable = 25,
DateTime = 26,
DateTimeNullable = 27,
DateTimeOffset = 28,
DateTimeOffsetNullable = 29,
Decimal = 30,
DecimalNullable = 31,
Guid = 32,
GuidNullable = 33,
TimeSpan = 34,
TimeSpanNullable = 35,
BigInteger = 36,
BigIntegerNullable = 37,
Uri = 38,
String = 39,
Bytes = 40,
DBNull = 41
}
internal class TypeInformation
{
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public Type Type { get; set; }
public PrimitiveTypeCode TypeCode { get; set; }
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}
internal enum ParseResult
{
None = 0,
Success = 1,
Overflow = 2,
Invalid = 3
}
internal static class ConvertUtils
{
private static readonly Dictionary<Type, PrimitiveTypeCode> TypeCodeMap =
new Dictionary<Type, PrimitiveTypeCode>
{
{ typeof(char), PrimitiveTypeCode.Char },
{ typeof(char?), PrimitiveTypeCode.CharNullable },
{ typeof(bool), PrimitiveTypeCode.Boolean },
{ typeof(bool?), PrimitiveTypeCode.BooleanNullable },
{ typeof(sbyte), PrimitiveTypeCode.SByte },
{ typeof(sbyte?), PrimitiveTypeCode.SByteNullable },
{ typeof(short), PrimitiveTypeCode.Int16 },
{ typeof(short?), PrimitiveTypeCode.Int16Nullable },
{ typeof(ushort), PrimitiveTypeCode.UInt16 },
{ typeof(ushort?), PrimitiveTypeCode.UInt16Nullable },
{ typeof(int), PrimitiveTypeCode.Int32 },
{ typeof(int?), PrimitiveTypeCode.Int32Nullable },
{ typeof(byte), PrimitiveTypeCode.Byte },
{ typeof(byte?), PrimitiveTypeCode.ByteNullable },
{ typeof(uint), PrimitiveTypeCode.UInt32 },
{ typeof(uint?), PrimitiveTypeCode.UInt32Nullable },
{ typeof(long), PrimitiveTypeCode.Int64 },
{ typeof(long?), PrimitiveTypeCode.Int64Nullable },
{ typeof(ulong), PrimitiveTypeCode.UInt64 },
{ typeof(ulong?), PrimitiveTypeCode.UInt64Nullable },
{ typeof(float), PrimitiveTypeCode.Single },
{ typeof(float?), PrimitiveTypeCode.SingleNullable },
{ typeof(double), PrimitiveTypeCode.Double },
{ typeof(double?), PrimitiveTypeCode.DoubleNullable },
{ typeof(DateTime), PrimitiveTypeCode.DateTime },
{ typeof(DateTime?), PrimitiveTypeCode.DateTimeNullable },
#if HAVE_DATE_TIME_OFFSET
{ typeof(DateTimeOffset), PrimitiveTypeCode.DateTimeOffset },
{ typeof(DateTimeOffset?), PrimitiveTypeCode.DateTimeOffsetNullable },
#endif
{ typeof(decimal), PrimitiveTypeCode.Decimal },
{ typeof(decimal?), PrimitiveTypeCode.DecimalNullable },
{ typeof(Guid), PrimitiveTypeCode.Guid },
{ typeof(Guid?), PrimitiveTypeCode.GuidNullable },
{ typeof(TimeSpan), PrimitiveTypeCode.TimeSpan },
{ typeof(TimeSpan?), PrimitiveTypeCode.TimeSpanNullable },
#if HAVE_BIG_INTEGER
{ typeof(BigInteger), PrimitiveTypeCode.BigInteger },
{ typeof(BigInteger?), PrimitiveTypeCode.BigIntegerNullable },
#endif
{ typeof(Uri), PrimitiveTypeCode.Uri },
{ typeof(string), PrimitiveTypeCode.String },
{ typeof(byte[]), PrimitiveTypeCode.Bytes },
#if HAVE_ADO_NET
{ typeof(DBNull), PrimitiveTypeCode.DBNull }
#endif
};
#if HAVE_ICONVERTIBLE
private static readonly TypeInformation[] PrimitiveTypeCodes =
{
// need all of these. lookup against the index with TypeCode value
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new TypeInformation { Type = typeof(object), TypeCode = PrimitiveTypeCode.Empty },
new TypeInformation { Type = typeof(object), TypeCode = PrimitiveTypeCode.Object },
new TypeInformation { Type = typeof(object), TypeCode = PrimitiveTypeCode.DBNull },
new TypeInformation { Type = typeof(bool), TypeCode = PrimitiveTypeCode.Boolean },
new TypeInformation { Type = typeof(char), TypeCode = PrimitiveTypeCode.Char },
new TypeInformation { Type = typeof(sbyte), TypeCode = PrimitiveTypeCode.SByte },
new TypeInformation { Type = typeof(byte), TypeCode = PrimitiveTypeCode.Byte },
new TypeInformation { Type = typeof(short), TypeCode = PrimitiveTypeCode.Int16 },
new TypeInformation { Type = typeof(ushort), TypeCode = PrimitiveTypeCode.UInt16 },
new TypeInformation { Type = typeof(int), TypeCode = PrimitiveTypeCode.Int32 },
new TypeInformation { Type = typeof(uint), TypeCode = PrimitiveTypeCode.UInt32 },
new TypeInformation { Type = typeof(long), TypeCode = PrimitiveTypeCode.Int64 },
new TypeInformation { Type = typeof(ulong), TypeCode = PrimitiveTypeCode.UInt64 },
new TypeInformation { Type = typeof(float), TypeCode = PrimitiveTypeCode.Single },
new TypeInformation { Type = typeof(double), TypeCode = PrimitiveTypeCode.Double },
new TypeInformation { Type = typeof(decimal), TypeCode = PrimitiveTypeCode.Decimal },
new TypeInformation { Type = typeof(DateTime), TypeCode = PrimitiveTypeCode.DateTime },
new TypeInformation { Type = typeof(object), TypeCode = PrimitiveTypeCode.Empty }, // no 17 in TypeCode for some reason
new TypeInformation { Type = typeof(string), TypeCode = PrimitiveTypeCode.String }
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};
#endif
public static PrimitiveTypeCode GetTypeCode(Type t)
{
return GetTypeCode(t, out _);
}
public static PrimitiveTypeCode GetTypeCode(Type t, out bool isEnum)
{
if (TypeCodeMap.TryGetValue(t, out PrimitiveTypeCode typeCode))
{
isEnum = false;
return typeCode;
}
if (t.IsEnum())
{
isEnum = true;
return GetTypeCode(Enum.GetUnderlyingType(t));
}
// performance?
if (ReflectionUtils.IsNullableType(t))
{
Type nonNullable = Nullable.GetUnderlyingType(t);
if (nonNullable.IsEnum())
{
Type nullableUnderlyingType = typeof(Nullable<>).MakeGenericType(Enum.GetUnderlyingType(nonNullable));
isEnum = true;
return GetTypeCode(nullableUnderlyingType);
}
}
isEnum = false;
return PrimitiveTypeCode.Object;
}
#if HAVE_ICONVERTIBLE
public static TypeInformation GetTypeInformation(IConvertible convertable)
{
TypeInformation typeInformation = PrimitiveTypeCodes[(int)convertable.GetTypeCode()];
return typeInformation;
}
#endif
public static bool IsConvertible(Type t)
{
#if HAVE_ICONVERTIBLE
return typeof(IConvertible).IsAssignableFrom(t);
#else
return (
t == typeof(bool) || t == typeof(byte) || t == typeof(char) || t == typeof(DateTime) || t == typeof(decimal) || t == typeof(double) || t == typeof(short) || t == typeof(int) ||
t == typeof(long) || t == typeof(sbyte) || t == typeof(float) || t == typeof(string) || t == typeof(ushort) || t == typeof(uint) || t == typeof(ulong) || t.IsEnum());
#endif
}
public static TimeSpan ParseTimeSpan(string input)
{
#if HAVE_TIME_SPAN_PARSE_WITH_CULTURE
return TimeSpan.Parse(input, CultureInfo.InvariantCulture);
#else
return TimeSpan.Parse(input);
#endif
}
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private static readonly ThreadSafeStore<StructMultiKey<Type, Type>, Func<object, object>> CastConverters =
new ThreadSafeStore<StructMultiKey<Type, Type>, Func<object, object>>(CreateCastConverter);
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private static Func<object, object> CreateCastConverter(StructMultiKey<Type, Type> t)
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{
Type initialType = t.Value1;
Type targetType = t.Value2;
MethodInfo castMethodInfo = targetType.GetMethod("op_Implicit", new[] { initialType })
?? targetType.GetMethod("op_Explicit", new[] { initialType });
if (castMethodInfo == null)
{
return null;
}
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MethodCall<object, object> call = JsonTypeReflector.ReflectionDelegateFactory.CreateMethodCall<object>(castMethodInfo);
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return o => call(null, o);
}
#if HAVE_BIG_INTEGER
internal static BigInteger ToBigInteger(object value)
{
if (value is BigInteger integer)
{
return integer;
}
if (value is string s)
{
return BigInteger.Parse(s, CultureInfo.InvariantCulture);
}
if (value is float f)
{
return new BigInteger(f);
}
if (value is double d)
{
return new BigInteger(d);
}
if (value is decimal @decimal)
{
return new BigInteger(@decimal);
}
if (value is int i)
{
return new BigInteger(i);
}
if (value is long l)
{
return new BigInteger(l);
}
if (value is uint u)
{
return new BigInteger(u);
}
if (value is ulong @ulong)
{
return new BigInteger(@ulong);
}
if (value is byte[] bytes)
{
return new BigInteger(bytes);
}
throw new InvalidCastException("Cannot convert {0} to BigInteger.".FormatWith(CultureInfo.InvariantCulture, value.GetType()));
}
public static object FromBigInteger(BigInteger i, Type targetType)
{
if (targetType == typeof(decimal))
{
return (decimal)i;
}
if (targetType == typeof(double))
{
return (double)i;
}
if (targetType == typeof(float))
{
return (float)i;
}
if (targetType == typeof(ulong))
{
return (ulong)i;
}
if (targetType == typeof(bool))
{
return i != 0;
}
try
{
return System.Convert.ChangeType((long)i, targetType, CultureInfo.InvariantCulture);
}
catch (Exception ex)
{
throw new InvalidOperationException("Can not convert from BigInteger to {0}.".FormatWith(CultureInfo.InvariantCulture, targetType), ex);
}
}
#endif
#region TryConvert
internal enum ConvertResult
{
Success = 0,
CannotConvertNull = 1,
NotInstantiableType = 2,
NoValidConversion = 3
}
public static object Convert(object initialValue, CultureInfo culture, Type targetType)
{
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switch (TryConvertInternal(initialValue, culture, targetType, out object value))
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{
case ConvertResult.Success:
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return value;
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case ConvertResult.CannotConvertNull:
throw new Exception("Can not convert null {0} into non-nullable {1}.".FormatWith(CultureInfo.InvariantCulture, initialValue.GetType(), targetType));
case ConvertResult.NotInstantiableType:
throw new ArgumentException("Target type {0} is not a value type or a non-abstract class.".FormatWith(CultureInfo.InvariantCulture, targetType), nameof(targetType));
case ConvertResult.NoValidConversion:
throw new InvalidOperationException("Can not convert from {0} to {1}.".FormatWith(CultureInfo.InvariantCulture, initialValue.GetType(), targetType));
default:
throw new InvalidOperationException("Unexpected conversion result.");
}
}
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private static bool TryConvert(object initialValue, CultureInfo culture, Type targetType, out object value)
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{
try
{
if (TryConvertInternal(initialValue, culture, targetType, out value) == ConvertResult.Success)
{
return true;
}
value = null;
return false;
}
catch
{
value = null;
return false;
}
}
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private static ConvertResult TryConvertInternal(object initialValue, CultureInfo culture, Type targetType, out object value)
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{
if (initialValue == null)
{
throw new ArgumentNullException(nameof(initialValue));
}
if (ReflectionUtils.IsNullableType(targetType))
{
targetType = Nullable.GetUnderlyingType(targetType);
}
Type initialType = initialValue.GetType();
if (targetType == initialType)
{
value = initialValue;
return ConvertResult.Success;
}
// use Convert.ChangeType if both types are IConvertible
if (IsConvertible(initialValue.GetType()) && IsConvertible(targetType))
{
if (targetType.IsEnum())
{
if (initialValue is string)
{
value = Enum.Parse(targetType, initialValue.ToString(), true);
return ConvertResult.Success;
}
else if (IsInteger(initialValue))
{
value = Enum.ToObject(targetType, initialValue);
return ConvertResult.Success;
}
}
value = System.Convert.ChangeType(initialValue, targetType, culture);
return ConvertResult.Success;
}
#if HAVE_DATE_TIME_OFFSET
if (initialValue is DateTime dt && targetType == typeof(DateTimeOffset))
{
value = new DateTimeOffset(dt);
return ConvertResult.Success;
}
#endif
if (initialValue is byte[] bytes && targetType == typeof(Guid))
{
value = new Guid(bytes);
return ConvertResult.Success;
}
if (initialValue is Guid guid && targetType == typeof(byte[]))
{
value = guid.ToByteArray();
return ConvertResult.Success;
}
if (initialValue is string s)
{
if (targetType == typeof(Guid))
{
value = new Guid(s);
return ConvertResult.Success;
}
if (targetType == typeof(Uri))
{
value = new Uri(s, UriKind.RelativeOrAbsolute);
return ConvertResult.Success;
}
if (targetType == typeof(TimeSpan))
{
value = ParseTimeSpan(s);
return ConvertResult.Success;
}
if (targetType == typeof(byte[]))
{
value = System.Convert.FromBase64String(s);
return ConvertResult.Success;
}
if (targetType == typeof(Version))
{
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if (VersionTryParse(s, out Version result))
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{
value = result;
return ConvertResult.Success;
}
value = null;
return ConvertResult.NoValidConversion;
}
if (typeof(Type).IsAssignableFrom(targetType))
{
value = Type.GetType(s, true);
return ConvertResult.Success;
}
}
#if HAVE_BIG_INTEGER
if (targetType == typeof(BigInteger))
{
value = ToBigInteger(initialValue);
return ConvertResult.Success;
}
if (initialValue is BigInteger integer)
{
value = FromBigInteger(integer, targetType);
return ConvertResult.Success;
}
#endif
#if HAVE_TYPE_DESCRIPTOR
// see if source or target types have a TypeConverter that converts between the two
TypeConverter toConverter = TypeDescriptor.GetConverter(initialType);
if (toConverter != null && toConverter.CanConvertTo(targetType))
{
value = toConverter.ConvertTo(null, culture, initialValue, targetType);
return ConvertResult.Success;
}
TypeConverter fromConverter = TypeDescriptor.GetConverter(targetType);
if (fromConverter != null && fromConverter.CanConvertFrom(initialType))
{
value = fromConverter.ConvertFrom(null, culture, initialValue);
return ConvertResult.Success;
}
#endif
#if HAVE_ADO_NET
// handle DBNull
if (initialValue == DBNull.Value)
{
if (ReflectionUtils.IsNullable(targetType))
{
value = EnsureTypeAssignable(null, initialType, targetType);
return ConvertResult.Success;
}
// cannot convert null to non-nullable
value = null;
return ConvertResult.CannotConvertNull;
}
#endif
if (targetType.IsInterface() || targetType.IsGenericTypeDefinition() || targetType.IsAbstract())
{
value = null;
return ConvertResult.NotInstantiableType;
}
value = null;
return ConvertResult.NoValidConversion;
}
#endregion
#region ConvertOrCast
/// <summary>
/// Converts the value to the specified type. If the value is unable to be converted, the
/// value is checked whether it assignable to the specified type.
/// </summary>
/// <param name="initialValue">The value to convert.</param>
/// <param name="culture">The culture to use when converting.</param>
/// <param name="targetType">The type to convert or cast the value to.</param>
/// <returns>
/// The converted type. If conversion was unsuccessful, the initial value
/// is returned if assignable to the target type.
/// </returns>
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public static object ConvertOrCast(object initialValue, CultureInfo culture, Type targetType)
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{
if (targetType == typeof(object))
{
return initialValue;
}
if (initialValue == null && ReflectionUtils.IsNullable(targetType))
{
return null;
}
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if (TryConvert(initialValue, culture, targetType, out object convertedValue))
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{
return convertedValue;
}
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return EnsureTypeAssignable(initialValue, ReflectionUtils.GetObjectType(initialValue), targetType);
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}
#endregion
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private static object EnsureTypeAssignable(object value, Type initialType, Type targetType)
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{
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Type valueType = value?.GetType();
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if (value != null)
{
if (targetType.IsAssignableFrom(valueType))
{
return value;
}
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Func<object, object> castConverter = CastConverters.Get(new StructMultiKey<Type, Type>(valueType, targetType));
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if (castConverter != null)
{
return castConverter(value);
}
}
else
{
if (ReflectionUtils.IsNullable(targetType))
{
return null;
}
}
throw new ArgumentException("Could not cast or convert from {0} to {1}.".FormatWith(CultureInfo.InvariantCulture, initialType?.ToString() ?? "{null}", targetType));
}
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public static bool VersionTryParse(string input, out Version result)
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{
#if HAVE_VERSION_TRY_PARSE
return Version.TryParse(input, out result);
#else
// improve failure performance with regex?
try
{
result = new Version(input);
return true;
}
catch
{
result = null;
return false;
}
#endif
}
public static bool IsInteger(object value)
{
switch (GetTypeCode(value.GetType()))
{
case PrimitiveTypeCode.SByte:
case PrimitiveTypeCode.Byte:
case PrimitiveTypeCode.Int16:
case PrimitiveTypeCode.UInt16:
case PrimitiveTypeCode.Int32:
case PrimitiveTypeCode.UInt32:
case PrimitiveTypeCode.Int64:
case PrimitiveTypeCode.UInt64:
return true;
default:
return false;
}
}
public static ParseResult Int32TryParse(char[] chars, int start, int length, out int value)
{
value = 0;
if (length == 0)
{
return ParseResult.Invalid;
}
bool isNegative = (chars[start] == '-');
if (isNegative)
{
// text just a negative sign
if (length == 1)
{
return ParseResult.Invalid;
}
start++;
length--;
}
int end = start + length;
// Int32.MaxValue and MinValue are 10 chars
// Or is 10 chars and start is greater than two
// Need to improve this!
if (length > 10 || (length == 10 && chars[start] - '0' > 2))
{
// invalid result takes precedence over overflow
for (int i = start; i < end; i++)
{
int c = chars[i] - '0';
if (c < 0 || c > 9)
{
return ParseResult.Invalid;
}
}
return ParseResult.Overflow;
}
for (int i = start; i < end; i++)
{
int c = chars[i] - '0';
if (c < 0 || c > 9)
{
return ParseResult.Invalid;
}
int newValue = (10 * value) - c;
// overflow has caused the number to loop around
if (newValue > value)
{
i++;
// double check the rest of the string that there wasn't anything invalid
// invalid result takes precedence over overflow result
for (; i < end; i++)
{
c = chars[i] - '0';
if (c < 0 || c > 9)
{
return ParseResult.Invalid;
}
}
return ParseResult.Overflow;
}
value = newValue;
}
// go from negative to positive to avoids overflow
// negative can be slightly bigger than positive
if (!isNegative)
{
// negative integer can be one bigger than positive
if (value == int.MinValue)
{
return ParseResult.Overflow;
}
value = -value;
}
return ParseResult.Success;
}
public static ParseResult Int64TryParse(char[] chars, int start, int length, out long value)
{
value = 0;
if (length == 0)
{
return ParseResult.Invalid;
}
bool isNegative = (chars[start] == '-');
if (isNegative)
{
// text just a negative sign
if (length == 1)
{
return ParseResult.Invalid;
}
start++;
length--;
}
int end = start + length;
// Int64.MaxValue and MinValue are 19 chars
if (length > 19)
{
// invalid result takes precedence over overflow
for (int i = start; i < end; i++)
{
int c = chars[i] - '0';
if (c < 0 || c > 9)
{
return ParseResult.Invalid;
}
}
return ParseResult.Overflow;
}
for (int i = start; i < end; i++)
{
int c = chars[i] - '0';
if (c < 0 || c > 9)
{
return ParseResult.Invalid;
}
long newValue = (10 * value) - c;
// overflow has caused the number to loop around
if (newValue > value)
{
i++;
// double check the rest of the string that there wasn't anything invalid
// invalid result takes precedence over overflow result
for (; i < end; i++)
{
c = chars[i] - '0';
if (c < 0 || c > 9)
{
return ParseResult.Invalid;
}
}
return ParseResult.Overflow;
}
value = newValue;
}
// go from negative to positive to avoids overflow
// negative can be slightly bigger than positive
if (!isNegative)
{
// negative integer can be one bigger than positive
if (value == long.MinValue)
{
return ParseResult.Overflow;
}
value = -value;
}
return ParseResult.Success;
}
#if HAS_CUSTOM_DOUBLE_PARSE
private static class IEEE754
{
/// <summary>
/// Exponents for both powers of 10 and 0.1
/// </summary>
private static readonly int[] MultExp64Power10 = new int[]
{
4, 7, 10, 14, 17, 20, 24, 27, 30, 34, 37, 40, 44, 47, 50
};
/// <summary>
/// Normalized powers of 10
/// </summary>
private static readonly ulong[] MultVal64Power10 = new ulong[]
{
0xa000000000000000, 0xc800000000000000, 0xfa00000000000000,
0x9c40000000000000, 0xc350000000000000, 0xf424000000000000,
0x9896800000000000, 0xbebc200000000000, 0xee6b280000000000,
0x9502f90000000000, 0xba43b74000000000, 0xe8d4a51000000000,
0x9184e72a00000000, 0xb5e620f480000000, 0xe35fa931a0000000,
};
/// <summary>
/// Normalized powers of 0.1
/// </summary>
private static readonly ulong[] MultVal64Power10Inv = new ulong[]
{
0xcccccccccccccccd, 0xa3d70a3d70a3d70b, 0x83126e978d4fdf3c,
0xd1b71758e219652e, 0xa7c5ac471b478425, 0x8637bd05af6c69b7,
0xd6bf94d5e57a42be, 0xabcc77118461ceff, 0x89705f4136b4a599,
0xdbe6fecebdedd5c2, 0xafebff0bcb24ab02, 0x8cbccc096f5088cf,
0xe12e13424bb40e18, 0xb424dc35095cd813, 0x901d7cf73ab0acdc,
};
/// <summary>
/// Exponents for both powers of 10^16 and 0.1^16
/// </summary>
private static readonly int[] MultExp64Power10By16 = new int[]
{
54, 107, 160, 213, 266, 319, 373, 426, 479, 532, 585, 638,
691, 745, 798, 851, 904, 957, 1010, 1064, 1117,
};
/// <summary>
/// Normalized powers of 10^16
/// </summary>
private static readonly ulong[] MultVal64Power10By16 = new ulong[]
{
0x8e1bc9bf04000000, 0x9dc5ada82b70b59e, 0xaf298d050e4395d6,
0xc2781f49ffcfa6d4, 0xd7e77a8f87daf7fa, 0xefb3ab16c59b14a0,
0x850fadc09923329c, 0x93ba47c980e98cde, 0xa402b9c5a8d3a6e6,
0xb616a12b7fe617a8, 0xca28a291859bbf90, 0xe070f78d39275566,
0xf92e0c3537826140, 0x8a5296ffe33cc92c, 0x9991a6f3d6bf1762,
0xaa7eebfb9df9de8a, 0xbd49d14aa79dbc7e, 0xd226fc195c6a2f88,
0xe950df20247c83f8, 0x81842f29f2cce373, 0x8fcac257558ee4e2,
};
/// <summary>
/// Normalized powers of 0.1^16
/// </summary>
private static readonly ulong[] MultVal64Power10By16Inv = new ulong[]
{
0xe69594bec44de160, 0xcfb11ead453994c3, 0xbb127c53b17ec165,
0xa87fea27a539e9b3, 0x97c560ba6b0919b5, 0x88b402f7fd7553ab,
0xf64335bcf065d3a0, 0xddd0467c64bce4c4, 0xc7caba6e7c5382ed,
0xb3f4e093db73a0b7, 0xa21727db38cb0053, 0x91ff83775423cc29,
0x8380dea93da4bc82, 0xece53cec4a314f00, 0xd5605fcdcf32e217,
0xc0314325637a1978, 0xad1c8eab5ee43ba2, 0x9becce62836ac5b0,
0x8c71dcd9ba0b495c, 0xfd00b89747823938, 0xe3e27a444d8d991a,
};
/// <summary>
/// Packs <paramref name="val"/>*10^<paramref name="scale"/> as 64-bit floating point value according to IEEE 754 standard
/// </summary>
/// <param name="negative">Sign</param>
/// <param name="val">Mantissa</param>
/// <param name="scale">Exponent</param>
/// <remarks>
/// Adoption of native function NumberToDouble() from coreclr sources,
/// see https://github.com/dotnet/coreclr/blob/master/src/classlibnative/bcltype/number.cpp#L451
/// </remarks>
public static double PackDouble(bool negative, ulong val, int scale)
{
// handle zero value
if (val == 0)
{
return negative ? -0.0 : 0.0;
}
// normalize the mantissa
int exp = 64;
if ((val & 0xFFFFFFFF00000000) == 0)
{
val <<= 32;
exp -= 32;
}
if ((val & 0xFFFF000000000000) == 0)
{
val <<= 16;
exp -= 16;
}
if ((val & 0xFF00000000000000) == 0)
{
val <<= 8;
exp -= 8;
}
if ((val & 0xF000000000000000) == 0)
{
val <<= 4;
exp -= 4;
}
if ((val & 0xC000000000000000) == 0)
{
val <<= 2;
exp -= 2;
}
if ((val & 0x8000000000000000) == 0)
{
val <<= 1;
exp -= 1;
}
if (scale < 0)
{
scale = -scale;
// check scale bounds
if (scale >= 22 * 16)
{
// underflow
return negative ? -0.0 : 0.0;
}
// perform scaling
int index = scale & 15;
if (index != 0)
{
exp -= MultExp64Power10[index - 1] - 1;
val = Mul64Lossy(val, MultVal64Power10Inv[index - 1], ref exp);
}
index = scale >> 4;
if (index != 0)
{
exp -= MultExp64Power10By16[index - 1] - 1;
val = Mul64Lossy(val, MultVal64Power10By16Inv[index - 1], ref exp);
}
}
else
{
// check scale bounds
if (scale >= 22 * 16)
{
// overflow
return negative ? double.NegativeInfinity : double.PositiveInfinity;
}
// perform scaling
int index = scale & 15;
if (index != 0)
{
exp += MultExp64Power10[index - 1];
val = Mul64Lossy(val, MultVal64Power10[index - 1], ref exp);
}
index = scale >> 4;
if (index != 0)
{
exp += MultExp64Power10By16[index - 1];
val = Mul64Lossy(val, MultVal64Power10By16[index - 1], ref exp);
}
}
// round & scale down
if ((val & (1 << 10)) != 0)
{
// IEEE round to even
ulong tmp = val + ((1UL << 10) - 1 + ((val >> 11) & 1));
if (tmp < val)
{
// overflow
tmp = (tmp >> 1) | 0x8000000000000000;
exp++;
}
val = tmp;
}
// return the exponent to a biased state
exp += 0x3FE;
// handle overflow, underflow, "Epsilon - 1/2 Epsilon", denormalized, and the normal case
if (exp <= 0)
{
if (exp == -52 && (val >= 0x8000000000000058))
{
// round X where {Epsilon > X >= 2.470328229206232730000000E-324} up to Epsilon (instead of down to zero)
val = 0x0000000000000001;
}
else if (exp <= -52)
{
// underflow
val = 0;
}
else
{
// denormalized value
val >>= (-exp + 12);
}
}
else if (exp >= 0x7FF)
{
// overflow
val = 0x7FF0000000000000;
}
else
{
// normal positive exponent case
val = ((ulong)exp << 52) | ((val >> 11) & 0x000FFFFFFFFFFFFF);
}
// apply sign
if (negative)
{
val |= 0x8000000000000000;
}
return BitConverter.Int64BitsToDouble((long)val);
}
private static ulong Mul64Lossy(ulong a, ulong b, ref int exp)
{
ulong a_hi = (a >> 32);
uint a_lo = (uint)a;
ulong b_hi = (b >> 32);
uint b_lo = (uint)b;
ulong result = a_hi * b_hi;
// save some multiplications if lo-parts aren't big enough to produce carry
// (hi-parts will be always big enough, since a and b are normalized)
if ((b_lo & 0xFFFF0000) != 0)
{
result += (a_hi * b_lo) >> 32;
}
if ((a_lo & 0xFFFF0000) != 0)
{
result += (a_lo * b_hi) >> 32;
}
// normalize
if ((result & 0x8000000000000000) == 0)
{
result <<= 1;
exp--;
}
return result;
}
}
public static ParseResult DoubleTryParse(char[] chars, int start, int length, out double value)
{
value = 0;
if (length == 0)
{
return ParseResult.Invalid;
}
bool isNegative = (chars[start] == '-');
if (isNegative)
{
// text just a negative sign
if (length == 1)
{
return ParseResult.Invalid;
}
start++;
length--;
}
int i = start;
int end = start + length;
int numDecimalStart = end;
int numDecimalEnd = end;
int exponent = 0;
ulong mantissa = 0UL;
int mantissaDigits = 0;
int exponentFromMantissa = 0;
for (; i < end; i++)
{
char c = chars[i];
switch (c)
{
case '.':
if (i == start)
{
return ParseResult.Invalid;
}
if (i + 1 == end)
{
return ParseResult.Invalid;
}
if (numDecimalStart != end)
{
// multiple decimal points
return ParseResult.Invalid;
}
numDecimalStart = i + 1;
break;
case 'e':
case 'E':
if (i == start)
{
return ParseResult.Invalid;
}
if (i == numDecimalStart)
{
// E follows decimal point
return ParseResult.Invalid;
}
i++;
if (i == end)
{
return ParseResult.Invalid;
}
if (numDecimalStart < end)
{
numDecimalEnd = i - 1;
}
c = chars[i];
bool exponentNegative = false;
switch (c)
{
case '-':
exponentNegative = true;
i++;
break;
case '+':
i++;
break;
}
// parse 3 digit
for (; i < end; i++)
{
c = chars[i];
if (c < '0' || c > '9')
{
return ParseResult.Invalid;
}
int newExponent = (10 * exponent) + (c - '0');
// stops updating exponent when overflowing
if (exponent < newExponent)
{
exponent = newExponent;
}
}
if (exponentNegative)
{
exponent = -exponent;
}
break;
default:
if (c < '0' || c > '9')
{
return ParseResult.Invalid;
}
if (i == start && c == '0')
{
i++;
if (i != end)
{
c = chars[i];
if (c == '.')
{
goto case '.';
}
if (c == 'e' || c == 'E')
{
goto case 'E';
}
return ParseResult.Invalid;
}
}
if (mantissaDigits < 19)
{
mantissa = (10 * mantissa) + (ulong)(c - '0');
if (mantissa > 0)
{
++mantissaDigits;
}
}
else
{
++exponentFromMantissa;
}
break;
}
}
exponent += exponentFromMantissa;
// correct the decimal point
exponent -= (numDecimalEnd - numDecimalStart);
value = IEEE754.PackDouble(isNegative, mantissa, exponent);
return double.IsInfinity(value) ? ParseResult.Overflow : ParseResult.Success;
}
#endif
public static ParseResult DecimalTryParse(char[] chars, int start, int length, out decimal value)
{
value = 0M;
const decimal decimalMaxValueHi28 = 7922816251426433759354395033M;
const ulong decimalMaxValueHi19 = 7922816251426433759UL;
const ulong decimalMaxValueLo9 = 354395033UL;
const char decimalMaxValueLo1 = '5';
if (length == 0)
{
return ParseResult.Invalid;
}
bool isNegative = (chars[start] == '-');
if (isNegative)
{
// text just a negative sign
if (length == 1)
{
return ParseResult.Invalid;
}
start++;
length--;
}
int i = start;
int end = start + length;
int numDecimalStart = end;
int numDecimalEnd = end;
int exponent = 0;
ulong hi19 = 0UL;
ulong lo10 = 0UL;
int mantissaDigits = 0;
int exponentFromMantissa = 0;
char? digit29 = null;
bool? storeOnly28Digits = null;
for (; i < end; i++)
{
char c = chars[i];
switch (c)
{
case '.':
if (i == start)
{
return ParseResult.Invalid;
}
if (i + 1 == end)
{
return ParseResult.Invalid;
}
if (numDecimalStart != end)
{
// multiple decimal points
return ParseResult.Invalid;
}
numDecimalStart = i + 1;
break;
case 'e':
case 'E':
if (i == start)
{
return ParseResult.Invalid;
}
if (i == numDecimalStart)
{
// E follows decimal point
return ParseResult.Invalid;
}
i++;
if (i == end)
{
return ParseResult.Invalid;
}
if (numDecimalStart < end)
{
numDecimalEnd = i - 1;
}
c = chars[i];
bool exponentNegative = false;
switch (c)
{
case '-':
exponentNegative = true;
i++;
break;
case '+':
i++;
break;
}
// parse 3 digit
for (; i < end; i++)
{
c = chars[i];
if (c < '0' || c > '9')
{
return ParseResult.Invalid;
}
int newExponent = (10 * exponent) + (c - '0');
// stops updating exponent when overflowing
if (exponent < newExponent)
{
exponent = newExponent;
}
}
if (exponentNegative)
{
exponent = -exponent;
}
break;
default:
if (c < '0' || c > '9')
{
return ParseResult.Invalid;
}
if (i == start && c == '0')
{
i++;
if (i != end)
{
c = chars[i];
if (c == '.')
{
goto case '.';
}
if (c == 'e' || c == 'E')
{
goto case 'E';
}
return ParseResult.Invalid;
}
}
if (mantissaDigits < 29 && (mantissaDigits != 28 || !(storeOnly28Digits ?? (storeOnly28Digits = (hi19 > decimalMaxValueHi19 || (hi19 == decimalMaxValueHi19 && (lo10 > decimalMaxValueLo9 || (lo10 == decimalMaxValueLo9 && c > decimalMaxValueLo1))))).GetValueOrDefault())))
{
if (mantissaDigits < 19)
{
hi19 = (hi19 * 10UL) + (ulong)(c - '0');
}
else
{
lo10 = (lo10 * 10UL) + (ulong)(c - '0');
}
++mantissaDigits;
}
else
{
if (!digit29.HasValue)
{
digit29 = c;
}
++exponentFromMantissa;
}
break;
}
}
exponent += exponentFromMantissa;
// correct the decimal point
exponent -= (numDecimalEnd - numDecimalStart);
if (mantissaDigits <= 19)
{
value = hi19;
}
else
{
value = (hi19 / new decimal(1, 0, 0, false, (byte)(mantissaDigits - 19))) + lo10;
}
if (exponent > 0)
{
mantissaDigits += exponent;
if (mantissaDigits > 29)
{
return ParseResult.Overflow;
}
if (mantissaDigits == 29)
{
if (exponent > 1)
{
value /= new decimal(1, 0, 0, false, (byte)(exponent - 1));
if (value > decimalMaxValueHi28)
{
return ParseResult.Overflow;
}
}
else if (value == decimalMaxValueHi28 && digit29 > decimalMaxValueLo1)
{
return ParseResult.Overflow;
}
value *= 10M;
}
else
{
value /= new decimal(1, 0, 0, false, (byte)exponent);
}
}
else
{
if (digit29 >= '5' && exponent >= -28)
{
++value;
}
if (exponent < 0)
{
if (mantissaDigits + exponent + 28 <= 0)
{
value = isNegative ? -0M : 0M;
return ParseResult.Success;
}
if (exponent >= -28)
{
value *= new decimal(1, 0, 0, false, (byte)(-exponent));
}
else
{
value /= 1e28M;
value *= new decimal(1, 0, 0, false, (byte)(-exponent - 28));
}
}
}
if (isNegative)
{
value = -value;
}
return ParseResult.Success;
}
public static bool TryConvertGuid(string s, out Guid g)
{
// GUID has to have format 00000000-0000-0000-0000-000000000000
#if !HAVE_GUID_TRY_PARSE
if (s == null)
{
throw new ArgumentNullException("s");
}
Regex format = new Regex("^[A-Fa-f0-9]{8}-([A-Fa-f0-9]{4}-){3}[A-Fa-f0-9]{12}$");
Match match = format.Match(s);
if (match.Success)
{
g = new Guid(s);
return true;
}
g = Guid.Empty;
return false;
#else
return Guid.TryParseExact(s, "D", out g);
#endif
}
public static bool TryHexTextToInt(char[] text, int start, int end, out int value)
{
value = 0;
for (int i = start; i < end; i++)
{
char ch = text[i];
int chValue;
if (ch <= 57 && ch >= 48)
{
chValue = ch - 48;
}
else if (ch <= 70 && ch >= 65)
{
chValue = ch - 55;
}
else if (ch <= 102 && ch >= 97)
{
chValue = ch - 87;
}
else
{
value = 0;
return false;
}
value += chValue << ((end - 1 - i) * 4);
}
return true;
}
}
}