CharacterRegionTypeConverter.cs

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// Copyright (c) 2014 Silicon Studio Corp. (http://siliconstudio.co.jp)
// This file is distributed under GPL v3. See LICENSE.md for details.
//
// Copyright (c) 2010-2013 SharpDX - Alexandre Mutel
// 
// Permission is hereby granted, free of charge, to any person obtaining a copy
// of this software and associated documentation files (the "Software"), to deal
// in the Software without restriction, including without limitation the rights
// to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
// copies of the Software, and to permit persons to whom the Software is
// furnished to do so, subject to the following conditions:
// 
// The above copyright notice and this permission notice shall be included in
// all copies or substantial portions of the Software.
// 
// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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// AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
// LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
// OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
// THE SOFTWARE.
// -----------------------------------------------------------------------------
// The following code is a port of MakeSpriteFont from DirectXTk
// http://go.microsoft.com/fwlink/?LinkId=248929
// -----------------------------------------------------------------------------
// Microsoft Public License (Ms-PL)
//
// This license governs use of the accompanying software. If you use the 
// software, you accept this license. If you do not accept the license, do not
// use the software.
//
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//--------------------------------------------------------------------
#if !W8CORE
using System;
using System.ComponentModel;
using System.Globalization;

namespace SiliconStudio.Paradox.Assets.SpriteFont.Compiler
{
    internal class CharacterRegionTypeConverter : TypeConverter
    {
        public override bool CanConvertFrom(ITypeDescriptorContext context, Type sourceType)
        {
            return sourceType == typeof(string);
        }


        public override object ConvertFrom(ITypeDescriptorContext context, CultureInfo culture, object value)
        {
            // Input must be a string.
            string source = value as string;

            if (string.IsNullOrEmpty(source))
            {
                throw new ArgumentException();
            }

            // Supported input formats:
            //  A
            //  A-Z
            //  32-127
            //  0x20-0x7F

            var splitStr = source.Split('-');
            var split = new char[splitStr.Length];
            for (int i = 0; i < splitStr.Length; i++)
            {
                split[i] = ConvertCharacter(splitStr[i]);
            }

            switch (split.Length)
            {
                case 1:
                    // Only a single character (eg. "a").
                    return new CharacterRegion(split[0], split[0]);

                case 2:
                    // Range of characters (eg. "a-z").
                    return new CharacterRegion(split[0], split[1]);
             
                default:
                    throw new ArgumentException();
            }
        }


        static char ConvertCharacter(string value)
        {
            if (value.Length == 1)
            {
                // Single character directly specifies a codepoint.
                return value[0];
            }
            else
            {
                // Otherwise it must be an integer (eg. "32" or "0x20").
                return (char)(int)intConverter.ConvertFromInvariantString(value);
            }
        }


        static TypeConverter intConverter = TypeDescriptor.GetConverter(typeof(int));
    }
}
#endif