Parser.Between.cs

using System;

namespace Pidgin
{
    public abstract partial class Parser<TToken, T>
    {
        /// <summary>
        /// Creates a parser that applies the specified parser both before and after applying the current parser.
        /// The resulting parser returns the result of the current parser, ignoring the return value of the bracketing parser.
        /// </summary>
        /// <param name="parser">The parser to apply before and after applying the current parser</param>
        /// <typeparam name="U">The type of the value returned by the bracketing parser</typeparam>
        /// <returns>A parser that applies the specified parser before and after applying the current parser</returns>
        public Parser<TToken, T> Between<U>(Parser<TToken, U> parser)
        {
            if (parser == null)
            {
                throw new ArgumentNullException(nameof(parser));
            }
            return this.Between(parser, parser);
        }
            
        /// <summary>
        /// Creates a parser that applies the specified parsers before and after applying the current parser.
        /// The resulting parser returns the result of the current parser, ignoring the return values of the bracketing parsers.
        /// </summary>
        /// <param name="parser1">The parser to apply before applying the current parser</param>
        /// <param name="parser2">The parser to apply after applying the current parser</param>
        /// <typeparam name="U">The type of the value returned by the first parser</typeparam>
        /// <typeparam name="V">The type of the value returned by the second parser</typeparam>
        /// <returns>A parser that applies the specified parsers before and after applying the current parser</returns>
        public Parser<TToken, T> Between<U, V>(Parser<TToken, U> parser1, Parser<TToken, V> parser2)
        {
            if (parser1 == null)
            {
                throw new ArgumentNullException(nameof(parser1));
            }
            if (parser2 == null)
            {
                throw new ArgumentNullException(nameof(parser2));
            }
            return Parser.Map((u, t, v) => t, parser1, this, parser2);
        }
    }
}