278 lines
8.4 KiB
C#
278 lines
8.4 KiB
C#
#region Copyright & License Information
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/*
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* Copyright 2007-2010 The OpenRA Developers (see AUTHORS)
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* This file is part of OpenRA, which is free software. It is made
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* available to you under the terms of the GNU General Public License
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* as published by the Free Software Foundation. For more information,
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* see LICENSE.
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*/
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#endregion
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using System;
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using System.Collections.Generic;
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using System.Drawing;
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using System.Linq;
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using System.Reflection;
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namespace OpenRA.FileFormats
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{
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public static class FieldLoader
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{
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public static Func<string,Type,string,object> InvalidValueAction = (s,t,f) =>
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{
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throw new InvalidOperationException("FieldLoader: Cannot parse `{0}` into `{1}.{2}` ".F(s,f,t) );
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};
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public static Action<string,Type> UnknownFieldAction = (s,f) =>
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{
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throw new NotImplementedException( "FieldLoader: Missing field `{0}` on `{1}`".F( s, f.Name ) );
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};
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public static void Load( object self, MiniYaml my )
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{
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var loadDict = typeLoadInfo[ self.GetType() ];
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foreach( var kv in loadDict )
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{
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object val;
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if( kv.Value != null )
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val = kv.Value( kv.Key.Name, kv.Key.FieldType, my );
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else if( !TryGetValueFromYaml( kv.Key.Name, kv.Key.FieldType, my, out val ) )
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continue;
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kv.Key.SetValue( self, val );
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}
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}
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static bool TryGetValueFromYaml( string fieldName, Type fieldType, MiniYaml yaml, out object ret )
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{
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ret = null;
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var n = yaml.Nodes.Where( x=>x.Key == fieldName ).ToList();
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if( n.Count == 0 )
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return false;
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if( n.Count == 1 && n[ 0 ].Value.Nodes.Count == 0 )
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{
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ret = GetValue( fieldName, fieldType, n[ 0 ].Value.Value );
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return true;
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}
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throw new InvalidOperationException( "TryGetValueFromYaml: unable to load field {0} (of type {1})".F( fieldName, fieldType ) );
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}
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public static T Load<T>(MiniYaml y) where T : new()
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{
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var t = new T();
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Load(t, y);
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return t;
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}
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public static void LoadFields( object self, Dictionary<string,MiniYaml> my, IEnumerable<string> fields )
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{
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foreach (var field in fields)
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{
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if (!my.ContainsKey(field)) continue;
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LoadField(self,field,my[field].Value);
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}
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}
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public static void LoadField( object self, string key, string value )
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{
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var field = self.GetType().GetField( key.Trim() );
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if( field == null )
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UnknownFieldAction( key.Trim(), self.GetType() );
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else if( field.HasAttribute<FieldFromYamlKeyAttribute>() )
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return;
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else
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field.SetValue( self, GetValue( field.Name, field.FieldType, value ) );
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}
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public static object GetValue( string field, Type fieldType, string x )
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{
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if (x != null) x = x.Trim();
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if( fieldType == typeof( int ) )
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{
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int res;
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if (int.TryParse(x,out res))
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return res;
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return InvalidValueAction(x,fieldType, field);
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}
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else if( fieldType == typeof( ushort ) )
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{
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ushort res;
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if (ushort.TryParse(x,out res))
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return res;
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return InvalidValueAction(x,fieldType, field);
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}
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else if (fieldType == typeof(float))
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{
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float res;
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if (float.TryParse(x.Replace("%",""), out res))
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return res * (x.Contains( '%' ) ? 0.01f : 1f);
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return InvalidValueAction(x,fieldType, field);
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}
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else if (fieldType == typeof(string))
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return x;
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else if (fieldType == typeof(Color))
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{
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var parts = x.Split(',');
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if (parts.Length == 3)
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return Color.FromArgb(int.Parse(parts[0]), int.Parse(parts[1]), int.Parse(parts[2]));
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if (parts.Length == 4)
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return Color.FromArgb(int.Parse(parts[0]), int.Parse(parts[1]), int.Parse(parts[2]), int.Parse(parts[3]));
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return InvalidValueAction(x,fieldType, field);
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}
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else if (fieldType.IsEnum)
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{
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if (!Enum.GetNames(fieldType).Select(a => a.ToLower()).Contains(x.ToLower()))
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return InvalidValueAction(x,fieldType, field);
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return Enum.Parse(fieldType, x, true);
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}
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else if (fieldType == typeof(bool))
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return ParseYesNo(x, fieldType, field);
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else if (fieldType.IsArray)
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{
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if (x == null)
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return Array.CreateInstance(fieldType.GetElementType(), 0);
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var parts = x.Split(new char[] { ',' }, StringSplitOptions.RemoveEmptyEntries);
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var ret = Array.CreateInstance(fieldType.GetElementType(), parts.Length);
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for (int i = 0; i < parts.Length; i++)
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ret.SetValue(GetValue(field, fieldType.GetElementType(), parts[i].Trim()), i);
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return ret;
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}
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else if (fieldType == typeof(int2))
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{
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var parts = x.Split(new char[] { ',' }, StringSplitOptions.RemoveEmptyEntries);
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return new int2(int.Parse(parts[0]), int.Parse(parts[1]));
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}
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UnknownFieldAction("[Type] {0}".F(x),fieldType);
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return null;
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}
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static object ParseYesNo( string p, System.Type fieldType, string field )
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{
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p = p.ToLowerInvariant();
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if( p == "yes" ) return true;
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if( p == "true" ) return true;
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if( p == "no" ) return false;
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if( p == "false" ) return false;
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return InvalidValueAction(p,fieldType, field);
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}
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static Cache<Type, Dictionary<FieldInfo, Func<string, Type, MiniYaml, object>>> typeLoadInfo = new Cache<Type, Dictionary<FieldInfo, Func<string, Type, MiniYaml, object>>>( GetTypeLoadInfo );
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static Dictionary<FieldInfo, Func<string, Type, MiniYaml, object>> GetTypeLoadInfo( Type type )
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{
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var ret = new Dictionary<FieldInfo, Func<string, Type, MiniYaml, object>>();
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var fieldsToLoad = new List<FieldInfo>();
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var attr = (CustomLoadAttribute[])type.GetCustomAttributes( typeof( CustomLoadAttribute ), false );
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if( attr.Length == 0 )
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{
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var defCtor = type.GetConstructor( new Type[ 0 ] );
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if( defCtor == null || ( defCtor.GetMethodImplementationFlags() | MethodImplAttributes.Runtime ) == 0 )
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throw new InvalidOperationException( "FieldLoader: refusing to load type {0}; has non-default ctor".F( type ) );
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fieldsToLoad.AddRange( type.GetFields() );
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}
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else if( attr[ 0 ].Fields != null )
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fieldsToLoad.AddRange( attr[ 0 ].Fields.Select( x => type.GetField( x ) ) );
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else
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fieldsToLoad.AddRange( type.GetFields() );
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foreach( var field in fieldsToLoad )
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ret.Add( field, null );
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foreach( var field in type.GetFields() )
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{
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var use = (LoadUsingAttribute[])field.GetCustomAttributes( typeof( LoadUsingAttribute ), false );
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if( use.Length != 0 )
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ret[ field ] = ( _1, _2, yaml ) => use[ 0 ].Loader( yaml );
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else
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{
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var attr2 = (FieldFromYamlKeyAttribute[])field.GetCustomAttributes( typeof( FieldFromYamlKeyAttribute ), false );
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if( attr2.Length != 0 )
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ret[ field ] = ( f, ft, yaml ) => GetValue( f, ft, yaml.Value );
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}
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}
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return ret;
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}
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public class CustomLoadAttribute : Attribute
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{
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public string[] Fields;
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}
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public class LoadUsingAttribute : Attribute
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{
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public readonly Func<MiniYaml, object> Loader;
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public LoadUsingAttribute( Func<MiniYaml, object> loader )
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{
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Loader = loader;
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}
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}
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}
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public static class FieldSaver
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{
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public static MiniYaml Save(object o)
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{
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var nodes = new List<MiniYamlNode>();
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string root = null;
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foreach( var f in o.GetType().GetFields( BindingFlags.Public | BindingFlags.Instance ) )
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{
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if( f.HasAttribute<FieldFromYamlKeyAttribute>() )
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root = FormatValue( o, f );
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else
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nodes.Add( new MiniYamlNode( f.Name, FormatValue( o, f ) ) );
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}
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return new MiniYaml( root, nodes );
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}
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public static MiniYaml SaveDifferences(object o, object from)
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{
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if (o.GetType() != from.GetType())
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throw new InvalidOperationException("FieldLoader: can't diff objects of different types");
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var fields = o.GetType().GetFields(BindingFlags.Public | BindingFlags.Instance)
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.Where(f => FormatValue(o,f) != FormatValue(from,f));
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return new MiniYaml( null, fields.Select( f => new MiniYamlNode(
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f.Name,
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FormatValue( o, f ) ) ).ToList() );
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}
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public static string FormatValue(object o, FieldInfo f)
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{
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var v = f.GetValue(o);
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if (v == null)
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return "";
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// Color.ToString() does the wrong thing; force it to format as an array
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if (f.FieldType == typeof(Color))
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{
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var c = (Color)v;
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return "{0},{1},{2},{3}".F(c.A,c.R,c.G,c.B);
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}
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return f.FieldType.IsArray
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? string.Join(",", ((Array)v).OfType<object>().Select(a => a.ToString()).ToArray())
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: v.ToString();
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}
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}
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public class FieldFromYamlKeyAttribute : Attribute { }
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}
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