public PluralEntry(IEnumerable <string> values, MatchTypeOptions matchType)
{
if (values == null)
{
throw new ArgumentNullException("values");
}
if (!Enum.IsDefined(typeof(MatchTypeOptions), matchType))
{
throw new ArgumentOutOfRangeException("matchType");
}
var valuesTidied = TidyStringList(values, v => v.Trim().ToLower());
if (!valuesTidied.Any())
{
throw new ArgumentException("No entries in values set");
}
Values = valuesTidied.AsReadOnly();
MatchType = matchType;
}
/// <summary>
/// Generate an expression that determines whether a string parameter matches a specified suffix / matchType combination
/// </summary>
private static Expression GeneratePredicate(string suffix, ParameterExpression valueTrimmed, MatchTypeOptions matchType)
{
if (string.IsNullOrWhiteSpace(suffix))
{
throw new ArgumentException("Null/blank suffix specified");
}
if (valueTrimmed == null)
{
throw new ArgumentNullException("valueTrimmed");
}
if (!Enum.IsDefined(typeof(MatchTypeOptions), matchType))
{
throw new ArgumentOutOfRangeException("matchType");
}
suffix = suffix.Trim();
var conditionElements = new List <Expression>();
var lengthProperty = typeof(string).GetProperty("Length");
var indexedProperty = typeof(string).GetProperties().First(p => (p.GetIndexParameters() ?? new ParameterInfo[0]).Any());
if (matchType == MatchTypeOptions.SuffixOnly)
{
conditionElements.Add(
Expression.GreaterThan(
Expression.Property(valueTrimmed, lengthProperty),
Expression.Constant(suffix.Length, typeof(int))
)
);
}
else
{
conditionElements.Add(
Expression.Equal(
Expression.Property(valueTrimmed, lengthProperty),
Expression.Constant(suffix.Length, typeof(int))
)
);
}
for (var index = 0; index < suffix.Length; index++)
{
conditionElements.Add(
Expression.Equal(
Expression.Constant(suffix[index], typeof(char)),
Expression.Property(
valueTrimmed,
indexedProperty,
Expression.Subtract(
Expression.Property(valueTrimmed, lengthProperty),
Expression.Constant(suffix.Length - index, typeof(int))
)
)
)
);
}
return(CombineExpressionsWithAndAlso(conditionElements));
}
