/// <summary>
/// Returns the mapper type for an item, or null if it is not a mapper type
/// </summary>
/// <param name="item">The item to investigate</param>
/// <returns>The mapper type or null</returns>
public static Type MapperType(BNFItem item)
{
return
(item.GetType().IsConstructedGenericType&& item.GetType().GetGenericTypeDefinition() == typeof(Mapper <>)
? item.GetType().GetGenericArguments().First()
: null);
}
/// <summary>
/// Constructs a new match
/// </summary>
/// <param name="token">The token that matched</param>
/// <param name="item">The item that matched</param>
/// <param name="subMatches">Submatches</param>
public Match(BNFItem token, ParseToken item, Match[] subMatches, bool matched)
{
Token = token;
Item = item;
SubMatches = subMatches;
Matched = matched;
}
/// <summary>
/// Constructs a new mapper item
/// </summary>
/// <param name="token">The token being matched</param>
/// <param name="matcher">The matcher function</param>
public static Mapper <T> Mapper <T>(BNFItem token, Func <Match, T> matcher)
{
return(new BNF.Mapper <T>(token, matcher));
}
/// <summary>
/// The token in the sequence
/// </summary>
/// <param name="sequence">The token to repeat</param>
public static Sequence Sequence(BNFItem sequence)
{
return(new BNF.Sequence(sequence));
}
/// <summary>
/// Constructs a new optional item
/// </summary>
/// <param name="item">The item to parse</param>
public static Optional Optional(BNFItem token)
{
return(new BNF.Optional(token));
}
/// <summary>
/// Constructs a new mapper item
/// </summary>
/// <param name="token">The token being matched</param>
/// <param name="matcher">The matcher function</param>
public Mapper(BNFItem token, Func <Match, T> matcher)
{
Matcher = matcher;
Token = token;
}