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//------------------------------------------------------------------------------
// <copyright file="DecimalFormatter.cs" company="Microsoft">
// Copyright (c) Microsoft Corporation. All rights reserved.
// </copyright>
// <owner current="true" primary="true">Microsoft</owner>
//------------------------------------------------------------------------------
using System.Diagnostics;
using System.Globalization;
using System.Text;
namespace System.Xml.Xsl.Runtime {
using Res = System.Xml.Utils.Res;
internal class DecimalFormat {
public NumberFormatInfo info;
public char digit;
public char zeroDigit;
public char patternSeparator;
internal DecimalFormat(NumberFormatInfo info, char digit, char zeroDigit, char patternSeparator) {
this.info = info;
this.digit = digit;
this.zeroDigit = zeroDigit;
this.patternSeparator = patternSeparator;
}
}
internal class DecimalFormatter {
private NumberFormatInfo posFormatInfo;
private NumberFormatInfo negFormatInfo;
private string posFormat;
private string negFormat;
private char zeroDigit;
// These characters have special meaning for CLR and must be escaped
// <spec>http://msdn.microsoft.com/library/default.asp?url=/library/en-us/cpguide/html/cpconcustomnumericformatstrings.asp</spec>
private const string ClrSpecialChars = "0#.,%\u2030Ee\\'\";";
// This character is used to escape literal (passive) digits '0'..'9'
private const char EscChar = '\a';
public DecimalFormatter(string formatPicture, DecimalFormat decimalFormat) {
Debug.Assert(formatPicture != null && decimalFormat != null);
if (formatPicture.Length == 0) {
throw XsltException.Create(Res.Xslt_InvalidFormat);
}
zeroDigit = decimalFormat.zeroDigit;
posFormatInfo = (NumberFormatInfo)decimalFormat.info.Clone();
StringBuilder temp = new StringBuilder();
bool integer = true;
bool sawPattern = false, sawZeroDigit = false, sawDigit = false, sawDecimalSeparator = false;
bool digitOrZeroDigit = false;
char decimalSeparator = posFormatInfo.NumberDecimalSeparator[0];
char groupSeparator = posFormatInfo.NumberGroupSeparator[0];
char percentSymbol = posFormatInfo.PercentSymbol[0];
char perMilleSymbol = posFormatInfo.PerMilleSymbol[0];
int commaIndex = 0;
int groupingSize = 0;
int decimalIndex = -1;
int lastDigitIndex = -1;
for (int i = 0; i < formatPicture.Length; i++) {
char ch = formatPicture[i];
if (ch == decimalFormat.digit) {
if (sawZeroDigit && integer) {
throw XsltException.Create(Res.Xslt_InvalidFormat1, formatPicture);
}
lastDigitIndex = temp.Length;
sawDigit = digitOrZeroDigit = true;
temp.Append('#');
continue;
}
if (ch == decimalFormat.zeroDigit) {
if (sawDigit && !integer) {
throw XsltException.Create(Res.Xslt_InvalidFormat2, formatPicture);
}
lastDigitIndex = temp.Length;
sawZeroDigit = digitOrZeroDigit = true;
temp.Append('0');
continue;
}
if (ch == decimalFormat.patternSeparator) {
if (!digitOrZeroDigit) {
throw XsltException.Create(Res.Xslt_InvalidFormat8);
}
if (sawPattern) {
throw XsltException.Create(Res.Xslt_InvalidFormat3, formatPicture);
}
sawPattern = true;
if (decimalIndex < 0) {
decimalIndex = lastDigitIndex + 1;
}
groupingSize = RemoveTrailingComma(temp, commaIndex, decimalIndex);
if (groupingSize > 9) {
groupingSize = 0;
}
posFormatInfo.NumberGroupSizes = new int[] { groupingSize };
if (!sawDecimalSeparator) {
posFormatInfo.NumberDecimalDigits = 0;
}
posFormat = temp.ToString();
temp.Length = 0;
decimalIndex = -1;
lastDigitIndex = -1;
commaIndex = 0;
sawDigit = sawZeroDigit = digitOrZeroDigit = false;
sawDecimalSeparator = false;
integer = true;
negFormatInfo = (NumberFormatInfo)decimalFormat.info.Clone();
negFormatInfo.NegativeSign = string.Empty;
continue;
}
if (ch == decimalSeparator) {
if (sawDecimalSeparator) {
throw XsltException.Create(Res.Xslt_InvalidFormat5, formatPicture);
}
decimalIndex = temp.Length;
sawDecimalSeparator = true;
sawDigit = sawZeroDigit = integer = false;
temp.Append('.');
continue;
}
if (ch == groupSeparator) {
commaIndex = temp.Length;
lastDigitIndex = commaIndex;
temp.Append(',');
continue;
}
if (ch == percentSymbol) {
temp.Append('%');
continue;
}
if (ch == perMilleSymbol) {
temp.Append('\u2030');
continue;
}
if (ch == '\'') {
int pos = formatPicture.IndexOf('\'', i + 1);
if (pos < 0) {
pos = formatPicture.Length - 1;
}
temp.Append(formatPicture, i, pos - i + 1);
i = pos;
continue;
}
// Escape literal digits with EscChar, double literal EscChar
if ('0' <= ch && ch <= '9' || ch == EscChar) {
if (decimalFormat.zeroDigit != '0') {
temp.Append(EscChar);
}
}
// Escape characters having special meaning for CLR
if (ClrSpecialChars.IndexOf(ch) >= 0) {
temp.Append('\\');
}
temp.Append(ch);
}
if (!digitOrZeroDigit) {
throw XsltException.Create(Res.Xslt_InvalidFormat8);
}
NumberFormatInfo formatInfo = sawPattern ? negFormatInfo : posFormatInfo;
if (decimalIndex < 0) {
decimalIndex = lastDigitIndex + 1;
}
groupingSize = RemoveTrailingComma(temp, commaIndex, decimalIndex);
if (groupingSize > 9) {
groupingSize = 0;
}
formatInfo.NumberGroupSizes = new int[] { groupingSize };
if (!sawDecimalSeparator) {
formatInfo.NumberDecimalDigits = 0;
}
if (sawPattern) {
negFormat = temp.ToString();
} else {
posFormat = temp.ToString();
}
}
private static int RemoveTrailingComma(StringBuilder builder, int commaIndex, int decimalIndex) {
if (commaIndex > 0 && commaIndex == (decimalIndex - 1)) {
builder.Remove(decimalIndex - 1, 1);
} else if (decimalIndex > commaIndex) {
return decimalIndex - commaIndex - 1;
}
return 0;
}
public string Format(double value) {
NumberFormatInfo formatInfo;
string subPicture;
if (value < 0 && negFormatInfo != null) {
formatInfo = this.negFormatInfo;
subPicture = this.negFormat;
} else {
formatInfo = this.posFormatInfo;
subPicture = this.posFormat;
}
string result = value.ToString(subPicture, formatInfo);
if (this.zeroDigit != '0') {
StringBuilder builder = new StringBuilder(result.Length);
int shift = this.zeroDigit - '0';
for (int i = 0; i < result.Length; i++) {
char ch = result[i];
if ((uint)(ch - '0') <= 9) {
ch += (char)shift;
} else if (ch == EscChar) {
// This is an escaped literal digit or EscChar, thus unescape it. We make use
// of the fact that no extra EscChar could be inserted by value.ToString().
Debug.Assert(i+1 < result.Length);
ch = result[++i];
Debug.Assert('0' <= ch && ch <= '9' || ch == EscChar);
}
builder.Append(ch);
}
result = builder.ToString();
}
return result;
}
public static string Format(double value, string formatPicture, DecimalFormat decimalFormat) {
return new DecimalFormatter(formatPicture, decimalFormat).Format(value);
}
}
}
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