/// <summary>
///
/// </summary>
/// <param name="sp"></param>
/// <returns></returns>
public static string ToStringData(this StringWithPosition sp)
{
string result = string.Empty;
if (sp != null)
{
result = sp.StringData;
}
return(result);
}
/// <summary>
/// 转换为位置，如果为null，则返回-1
/// </summary>
/// <param name="sp"></param>
/// <returns></returns>
public static int ToPosition(this StringWithPosition sp)
{
int result = -1;
if (sp != null)
{
result = sp.Position;
}
return(result);
}
/// <summary>
/// StringWithPosition的StringData是否等于某个字符串。如果sp为null，则相当于比较空串
/// </summary>
/// <param name="sp"></param>
/// <param name="actual"></param>
/// <param name="ignoreCase"></param>
/// <returns></returns>
public static bool AreEqual(this StringWithPosition sp, string actual, bool ignoreCase = false)
{
bool result = false;
if (sp != null)
{
result = string.Compare(sp.StringData, actual, ignoreCase) == 0;
}
else
{
result = actual.IsNullOrEmpty();
}
return(result);
}
/// <summary>
///
/// </summary>
/// <param name="identifiers"></param>
/// <param name="maxPosition"></param>
/// <returns></returns>
public static StringWithPosition FindPreviousIdentifier(this IList <StringWithPosition> identifiers, int maxPosition = int.MaxValue)
{
StringWithPosition result = null;
if (identifiers != null)
{
for (int i = identifiers.Count - 1; i >= 0; i--)
{
StringWithPosition identifier = identifiers[i];
if (identifier.Position < maxPosition)
{
result = identifier;
break;
}
}
}
return(result);
}
/// <summary>
///
/// </summary>
/// <param name="sp"></param>
/// <param name="actual"></param>
/// <param name="ignoreCase"></param>
/// <returns></returns>
public static bool Include(this StringWithPosition sp, string actual, bool ignoreCase = false)
{
bool result = false;
if (sp != null && sp.StringData != null)
{
StringComparison sc = StringComparison.Ordinal;
if (ignoreCase)
{
sc = StringComparison.OrdinalIgnoreCase;
}
result = sp.StringData.IndexOf(actual, sc) >= 0;
}
else
{
result = actual.IsNullOrEmpty();
}
return(result);
}
/// <summary>
///
/// </summary>
/// <param name="sp"></param>
/// <param name="actual"></param>
/// <param name="ignoreCase"></param>
/// <returns></returns>
public static bool AreNotEqual(this StringWithPosition sp, string actual, bool ignoreCase = false)
{
return(AreEqual(sp, actual, ignoreCase) == false);
}