/// <summary>Determines whether a string is valid <see cref="T:NMasters.Silverlight.Net.Http.Headers.StringWithQualityHeaderValue" /> information.</summary>
/// <returns>Returns <see cref="T:System.Boolean" />.true if <paramref name="input" /> is valid <see cref="T:NMasters.Silverlight.Net.Http.Headers.StringWithQualityHeaderValue" /> information; otherwise, false.</returns>
/// <param name="input">The string to validate.</param>
/// <param name="parsedValue">The <see cref="T:NMasters.Silverlight.Net.Http.Headers.StringWithQualityHeaderValue" /> version of the string.</param>
public static bool TryParse(string input, out StringWithQualityHeaderValue parsedValue)
{
object obj2;
int index = 0;
parsedValue = null;
if (GenericHeaderParser.SingleValueStringWithQualityParser.TryParseValue(input, null, ref index, out obj2))
{
parsedValue = (StringWithQualityHeaderValue) obj2;
return true;
}
return false;
}
private static bool TryReadQuality(string input, StringWithQualityHeaderValue result, ref int index)
{
int startIndex = index;
if ((startIndex == input.Length) || ((input[startIndex] != 'q') && (input[startIndex] != 'Q')))
{
return false;
}
startIndex++;
startIndex += HttpRuleParser.GetWhitespaceLength(input, startIndex);
if ((startIndex == input.Length) || (input[startIndex] != '='))
{
return false;
}
startIndex++;
startIndex += HttpRuleParser.GetWhitespaceLength(input, startIndex);
if (startIndex == input.Length)
{
return false;
}
int length = HttpRuleParser.GetNumberLength(input, startIndex, true);
if (length == 0)
{
return false;
}
double num3 = 0.0;
if (!double.TryParse(input.Substring(startIndex, length), NumberStyles.AllowDecimalPoint, (IFormatProvider) NumberFormatInfo.InvariantInfo, out num3))
{
return false;
}
if ((num3 < 0.0) || (num3 > 1.0))
{
return false;
}
result.quality = new double?(num3);
startIndex += length;
startIndex += HttpRuleParser.GetWhitespaceLength(input, startIndex);
index = startIndex;
return true;
}
private StringWithQualityHeaderValue(StringWithQualityHeaderValue source)
{
this.value = source.value;
this.quality = source.quality;
}
internal static int GetStringWithQualityLength(string input, int startIndex, out object parsedValue)
{
parsedValue = null;
if (string.IsNullOrEmpty(input) || (startIndex >= input.Length))
{
return 0;
}
int tokenLength = HttpRuleParser.GetTokenLength(input, startIndex);
if (tokenLength == 0)
{
return 0;
}
StringWithQualityHeaderValue result = new StringWithQualityHeaderValue {
value = input.Substring(startIndex, tokenLength)
};
int num2 = startIndex + tokenLength;
num2 += HttpRuleParser.GetWhitespaceLength(input, num2);
if ((num2 == input.Length) || (input[num2] != ';'))
{
parsedValue = result;
return (num2 - startIndex);
}
num2++;
num2 += HttpRuleParser.GetWhitespaceLength(input, num2);
if (!TryReadQuality(input, result, ref num2))
{
return 0;
}
parsedValue = result;
return (num2 - startIndex);
}