MultiLineTextAttribute.cs

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// Copyright 2005-2015 Giacomo Stelluti Scala & Contributors. All rights reserved. See License.md in the project root for license information.
 
using System;
using System.Linq;
using System.Text;
 
namespace CommandLine.Text
{
    public abstract class MultilineTextAttribute : Attribute
    {
        protected MultilineTextAttribute(string line1)
            : this(line1, string.Empty, string.Empty, string.Empty, string.Empty) { }
 
        protected MultilineTextAttribute(string line1, string line2)
            : this(line1, line2, string.Empty, string.Empty, string.Empty) { }
 
        protected MultilineTextAttribute(string line1, string line2, string line3)
            : this(line1, line2, line3, string.Empty, string.Empty) { }
 
        protected MultilineTextAttribute(string line1, string line2, string line3, string line4)
            : this(line1, line2, line3, line4, string.Empty) { }
 
        protected MultilineTextAttribute(string line1, string line2, string line3, string line4, string line5)
        {
            if (line1 == null)
            {
                throw new ArgumentException("line1");
            }
 
            if (line2 == null)
            {
                throw new ArgumentException("line2");
            }
 
            if (line3 == null)
            {
                throw new ArgumentException("line3");
            }
 
            if (line4 == null)
            {
                throw new ArgumentException("line4");
            }
 
            if (line5 == null)
            {
                throw new ArgumentException("line5");
            }
 
            Line1 = line1;
            Line2 = line2;
            Line3 = line3;
            Line4 = line4;
            Line5 = line5;
        }
 
        public virtual string Value
        {
            get
            {
                StringBuilder value = new StringBuilder(string.Empty);
                string[] strArray = { Line1, Line2, Line3, Line4, Line5 };
 
                for (int i = 0; i < GetLastLineWithText(strArray); i++)
                {
                    value.AppendLine(strArray[i]);
                }
 
                return value.ToString();
            }
        }
 
        public string Line1 { get; }
 
        public string Line2 { get; }
 
        public string Line3 { get; }
 
        public string Line4 { get; }
 
        public string Line5 { get; }
 
        internal HelpText AddToHelpText(HelpText helpText, Func<string, HelpText> func)
        {
            string[] strArray = { Line1, Line2, Line3, Line4, Line5 };
 
            return strArray.Take(GetLastLineWithText(strArray))
                           .Aggregate(helpText, (current, line) => func(line));
        }
 
        internal HelpText AddToHelpText(HelpText helpText, bool before)
        {
            // before flag only distinguishes which action is called, 
            // so refactor common code and call with appropriate func
            return before
                       ? AddToHelpText(helpText, helpText.AddPreOptionsLine)
                       : AddToHelpText(helpText, helpText.AddPostOptionsLine);
        }
 
        protected virtual int GetLastLineWithText(string[] value)
        {
            int index = Array.FindLastIndex(value, str => !string.IsNullOrEmpty(str));
 
            // remember FindLastIndex returns zero-based index
            return index + 1;
        }
    }
}