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NumericFormatter.cs
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NumericFormatter.cs
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using Sepia.Globalization.Plurals;
using System;
using System.Collections.Generic;
using System.Globalization;
using System.Linq;
using System.Text;
using System.Text.RegularExpressions;
using System.Threading.Tasks;
namespace Sepia.Globalization.Numbers
{
class NumericFormatter : NumberFormatter
{
static string[] digits = new NumberFormatInfo().NativeDigits;
static Regex significantDigitsPattern = new Regex(@"\.0+", RegexOptions.Compiled | RegexOptions.CultureInvariant);
static Regex groupingPattern = new Regex(@"[\#0]+[,\.]", RegexOptions.Compiled | RegexOptions.CultureInvariant);
public override string Format(long value)
{
var pattern = FindPattern(value);
if (pattern.NumberNeedsAdjusting())
{
value = (long) pattern.Adjust(value);
}
int nDigits = (value == 0) ? 1 : ((int)Math.Floor(Math.Log10(Math.Abs(value))) + 1);
var nfi = NumberInfo(null, nDigits, pattern);
return Transform(value.ToString(pattern.FormatString, nfi), null, pattern.FormatString, nfi);
}
public override string Format(decimal value)
{
var pattern = FindPattern(value);
if (pattern.NumberNeedsAdjusting())
{
value = pattern.Adjust(value);
}
int nDigits = (value == 0) ? 1 : ((int)Math.Floor(Math.Log10((double)Math.Abs(value))) + 1);
var nfi = NumberInfo(null, nDigits, pattern);
return Transform(value.ToString(pattern.FormatString, nfi), null, pattern.FormatString, nfi);
}
public override string Format(double value)
{
decimal dvalue = Double.IsInfinity(value) || Double.IsNaN(value)
? 0
: (decimal)value;
var pattern = FindPattern(dvalue);
if (pattern.NumberNeedsAdjusting())
{
value = (double)pattern.Adjust(dvalue);
}
int nDigits = (value == 0) ? 1 : ((int)Math.Floor(Math.Log10(Math.Abs(value))) + 1);
var nfi = NumberInfo(null, nDigits, pattern);
return Transform(value.ToString(pattern.FormatString, nfi), null, pattern.FormatString, nfi);
}
public override string Format(long value, string currencyCode)
{
var pattern = FindPattern(value);
if (pattern.NumberNeedsAdjusting())
{
value = (long)pattern.Adjust(value);
}
int nDigits = (value == 0) ? 1 : ((int)Math.Floor(Math.Log10(Math.Abs(value))) + 1);
var nfi = NumberInfo(currencyCode, nDigits, pattern);
return Transform(value.ToString(pattern.FormatString, nfi), currencyCode, pattern.FormatString, nfi);
}
public override string Format(decimal value, string currencyCode)
{
var pattern = FindPattern(value);
if (pattern.NumberNeedsAdjusting())
{
value = pattern.Adjust(value);
}
int nDigits = (value == 0) ? 1 : ((int)Math.Floor(Math.Log10((double)Math.Abs(value))) + 1);
var nfi = NumberInfo(currencyCode, nDigits, pattern);
return Transform(value.ToString(pattern.FormatString, nfi), currencyCode, pattern.FormatString, nfi);
}
public override string Format(double value, string currencyCode)
{
decimal dvalue = Double.IsInfinity(value) || Double.IsNaN(value)
? 0
: (decimal)value;
var pattern = FindPattern(dvalue);
if (pattern.NumberNeedsAdjusting())
{
value = (double)pattern.Adjust(dvalue);
}
int nDigits = (value == 0) ? 1 : ((int)Math.Floor(Math.Log10(Math.Abs(value))) + 1);
var nfi = NumberInfo(currencyCode, nDigits, pattern);
return Transform(value.ToString(pattern.FormatString, nfi), currencyCode, pattern.FormatString, nfi);
}
NumberFormatInfo NumberInfo(string currencyCode, int nDigits, NumberPattern pattern)
{
var nfi = new NumberFormatInfo
{
NaNSymbol = Symbols.NotANumber,
NegativeSign = Symbols.MinusSign,
NegativeInfinitySymbol = Symbols.MinusSign + Symbols.Infinity,
NumberDecimalSeparator = Symbols.Decimal,
NumberGroupSeparator = Symbols.Group,
// NativeDigits is NOT by used the C# formatter!!
//NativeDigits = NumberingSystem.Digits,
PercentDecimalSeparator = Symbols.Decimal,
PercentSymbol = Symbols.PercentSign,
PerMilleSymbol = Symbols.PerMille,
PositiveInfinitySymbol = Symbols.Infinity,
PositiveSign = Symbols.PlusSign
};
if (Options.Style == NumberStyle.Scientific && pattern.FormatString == "#E0")
{
pattern.FormatString = "0.0######E0";
}
else if (Options.Style == NumberStyle.CurrencyStandard || Options.Style == NumberStyle.CurrencyAccounting)
{
nfi.NumberDecimalSeparator = Symbols.CurrencyDecimal;
nfi.NumberGroupSeparator = Symbols.CurrencyGroup;
// Apply currency decimal places
if (currencyCode == null)
currencyCode = Locale.CurrencyCode;
var digits = Cldr.Instance
.GetDocuments("common/supplemental/supplementalData.xml")
.FirstElementOrDefault($"supplementalData/currencyData/fractions/info[@iso4217='{currencyCode}']/@digits");
if (digits != null)
{
int significantDigits = Int32.Parse(digits.Value);
pattern.FormatString = significantDigitsPattern.Replace(pattern.FormatString, "." + new String('0', significantDigits));
}
}
// Grouping of digits.
var useGrouping = Options.UseGrouping;
if (useGrouping)
{
// Grouping digits, "#,##,##0" => [3, 2, 1]
var parts = pattern.FormatString.Split(';');
nfi.NumberGroupSizes = groupingPattern
.Matches(parts[0])
.Cast<Match>()
.Skip(1)
.Reverse()
.Select(m => m.Length - 1)
.DefaultIfEmpty(3)
.ToArray();
// Don't group if min grouping digits is not met.
var minElement = Locale.FindOrDefault("ldml/numbers/minimumGroupingDigits");
if (minElement != null)
{
var minDigits = Int32.Parse(minElement.Value) + nfi.NumberGroupSizes[0];
useGrouping = nDigits > minDigits;
}
}
if (!useGrouping)
{
nfi.NumberGroupSeparator = "";
}
nfi.PercentGroupSizes = nfi.NumberGroupSizes;
nfi.PercentGroupSeparator = nfi.NumberGroupSeparator;
return nfi;
}
NumberPattern FindPattern(decimal value, NumberLength? nl = null)
{
if (!nl.HasValue)
{
nl = Options.Length;
}
value = Math.Abs(value);
// Determine the format length type.
var flt = nl == NumberLength.Default
? "[not(@type)]"
: $"[@type='{nl.ToString().ToLowerInvariant()}']";
// Determine the path in the ldml to the pattern(s)
var path = String.Empty;
if (Options.Style == NumberStyle.Decimal)
{
path = $"ldml/numbers/decimalFormats[@numberSystem='{NumberingSystem.Id}']/decimalFormatLength{flt}/decimalFormat";
}
else if (Options.Style == NumberStyle.Percent)
{
path = $"ldml/numbers/percentFormats[@numberSystem='{NumberingSystem.Id}']/percentFormatLength{flt}/percentFormat";
}
else if (Options.Style == NumberStyle.Scientific)
{
path = $"ldml/numbers/scientificFormats[@numberSystem='{NumberingSystem.Id}']/scientificFormatLength{flt}/scientificFormat";
}
else if (Options.Style == NumberStyle.CurrencyStandard)
{
path = $"ldml/numbers/currencyFormats[@numberSystem='{NumberingSystem.Id}']/currencyFormatLength{flt}/currencyFormat[@type='standard']";
}
else if (Options.Style == NumberStyle.CurrencyAccounting)
{
path = $"ldml/numbers/currencyFormats[@numberSystem='{NumberingSystem.Id}']/currencyFormatLength{flt}/currencyFormat[@type='accounting']";
}
else
{
throw new NotImplementedException($"Unknown NumberStyle '{Options.Style}'.");
}
var xml = Locale.FindOrDefault(path);
// Fall back to default number length;
if (xml == null && nl != NumberLength.Default)
{
return FindPattern(value, NumberLength.Default);
}
// Should not happen.
if (xml == null)
{
throw new KeyNotFoundException($"Cannot find CLDR '{path}'.");
}
// Get the best pattern.
var category = Plural.Create(Locale).Category(value);
NumberPattern best = null;
NumberPattern previous = null;
var pattern = xml.SelectChildren("pattern", "");
while (pattern.MoveNext())
{
var p = NumberPattern.Parse(pattern.Current);
// If not a value range, then this is the best pattern.
if (!p.MinValue.HasValue)
{
best = p;
break;
}
// Only consider a pattern with the correct count.
if (p.Count != category)
{
continue;
}
// Get closest value in the range.
if (p.MinValue.Value > value)
{
best = previous;
break;
}
previous = p;
}
best = best ?? previous ?? new NumberPattern { FormatString = "0" };
return best;
}
string Transform(string s, string currencyCode, string pattern, NumberFormatInfo nfi)
{
var sb = new StringBuilder(s);
// Replace digits with number system digits.
for (int i = 0; i < 10; ++i)
{
sb.Replace(digits[i], NumberingSystem.Digits[i]);
}
// Replace currency symbol
if (s.Contains("¤"))
{
if (currencyCode == null)
{
currencyCode = Locale.CurrencyCode;
}
if (s.Contains("¤¤¤¤¤"))
{
throw new NotImplementedException();
}
else if (s.Contains("¤¤¤¤"))
{
throw new NotImplementedException();
}
else if (s.Contains("¤¤¤"))
{
// Currency display name
throw new NotImplementedException();
}
else if (s.Contains("¤¤"))
{
// ISO currency symbol
sb.Replace("¤¤", currencyCode);
}
else if (s.Contains("¤"))
{
// Standard currency symbol
var symbol = $"ldml/numbers/currencies/currency[@type='{currencyCode}']/symbol";
sb.Replace("¤", Locale.Find(symbol).Value);
}
}
return sb.ToString();
}
}
}