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//
// BindingMember.cs
//
// Author:
// Jean-Philippe Bruyère <jp.bruyere@hotmail.com>
//
// Copyright (c) 2013-2017 Jean-Philippe Bruyère
//
// 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,
// FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
// 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.
using System;
using System.Reflection.Emit;
namespace Crow.IML
{
/// <summary>
/// Binding expression parser.
///
/// Valid tokens in binding expression:
/// - '../' => 1 level up in graphic tree
/// - './' or '/' => template root level
/// - '.Name1.Name2' current level properties
/// - 'name.prop' named descendant in graphic tree, search with 'FindByName' method of GraphicObject
/// </summary>
public class BindingMember
{
/// <summary>
/// true if expression was enclosed in '
/// </summary>
public bool IsStringConstant = false;
/// <summary>
/// Nb level to go up, '-1' for template root
/// </summary>
public int LevelsUp;
/// <summary>
/// Remaining string after '/' split, splitted on '.'
/// </summary>
public string[] Tokens;
/// <summary>
/// Target the template's root node, expression was in the form './name[.name[...]]' or '/name[.name[...]]'
/// </summary>
public bool IsTemplateBinding { get { return LevelsUp < 0; }}
/// <summary>
/// No level change and expression was '.name'
/// </summary>
/// <value><c>true</c> if this instance is current node property; otherwise, <c>false</c>.</value>
public bool IsCurrentNodeProperty {
get {
return LevelsUp == 0 && ( Tokens.Length == 2 && string.IsNullOrEmpty(Tokens[0]));
}
}
/// <summary>
/// no level change, and only a single name in Tokens[], that's dataSource member if property binding
/// </summary>
public bool IsSingleName { get { return LevelsUp == 0 && Tokens.Length == 1; }}
#region CTOR
/// <summary>
/// Initializes a new instance of BindingMember.
/// </summary>
public BindingMember (){}
/// <summary>
/// Initializes a new instance of BindingMember by parsing the string passed as argument
/// </summary>
/// <param name="expression">binding expression</param>
public BindingMember (string expression){
if (string.IsNullOrEmpty (expression))
return;
string[] splitedExp = expression.Trim().Split ('/');
int ptr = 0;
if (splitedExp.Length == 1) {
if (splitedExp [0].StartsWith ("\'")) {
if (!splitedExp [0].EndsWith ("\'"))
throw new Exception (string.Format
("IML:malformed string constant in binding expression: {0}", splitedExp [0]));
Tokens = new string[] { splitedExp [0].Substring (1, splitedExp [0].Length - 2) };
IsStringConstant = true;
return;
}
} else {
if (string.IsNullOrEmpty (splitedExp [0]) || splitedExp [0] == ".") {//template root
LevelsUp = -1;
ptr++;
} else {
while (splitedExp [ptr] == "..")
ptr++;
LevelsUp = ptr;
}
}
if (ptr != splitedExp.Length - 1)
throw new Exception ("invalid expresion: " + expression);
Tokens = splitedExp [ptr].Split ('.');
}
#endregion
/// <summary>
/// Emits the MSIL instructions to get the target of the binding expression
/// </summary>
/// <param name="il">current MSIL generator</param>
/// <param name="cancel">cancel branching in MSIL if something go wrong</param>
public void emitGetTarget(ILGenerator il, System.Reflection.Emit.Label cancel){
if (IsTemplateBinding) {
System.Reflection.Emit.Label nextLogicParent = il.DefineLabel ();
il.MarkLabel (nextLogicParent);
il.Emit (OpCodes.Callvirt, CompilerServices.miGetLogicalParent);
il.Emit (OpCodes.Dup);
il.Emit (OpCodes.Brfalse, cancel);
il.Emit (OpCodes.Isinst, typeof(TemplatedControl));
il.Emit (OpCodes.Dup);
il.Emit (OpCodes.Brfalse, nextLogicParent);
} else if (LevelsUp > 0) {//go upward in logical tree
il.Emit (OpCodes.Ldc_I4, LevelsUp);//push arg 2 of goUpLevels
il.Emit (OpCodes.Callvirt, CompilerServices.miGoUpLevels);
//test if null
il.Emit (OpCodes.Dup);
il.Emit (OpCodes.Brfalse, cancel);
}
if (!string.IsNullOrEmpty (Tokens [0])) {//find by name
il.Emit (OpCodes.Ldstr, Tokens [0]);
il.Emit (OpCodes.Callvirt, CompilerServices.miFindByName);
il.Emit (OpCodes.Dup);
il.Emit (OpCodes.Brfalse, cancel);
}
for (int i = 1; i < Tokens.Length -1; i++) {
System.Reflection.Emit.Label miOK = il.DefineLabel ();
il.Emit (OpCodes.Dup);//duplicate instance
il.Emit (OpCodes.Ldstr, Tokens [i]);//load member name
il.Emit (OpCodes.Call, CompilerServices.miGetMembIinfoWithRefx);
il.Emit (OpCodes.Dup);
il.Emit (OpCodes.Brtrue, miOK);
il.Emit (OpCodes.Pop);//pop dup instance
il.Emit (OpCodes.Br, cancel);
il.MarkLabel (miOK);
il.Emit (OpCodes.Call, CompilerServices.miGetValWithRefx);
il.Emit (OpCodes.Dup);
il.Emit (OpCodes.Brfalse, cancel);
}
}
/// <summary>
/// Emit the MSIL instructions to get the target property of the binding expression
/// </summary>
/// <param name="il">current MSIL generator</param>
/// <param name="cancel">cancel branching in MSIL if something go wrong</param>
public void emitGetProperty(ILGenerator il, System.Reflection.Emit.Label cancel) {
System.Reflection.Emit.Label miOK = il.DefineLabel ();
il.Emit (OpCodes.Dup);//duplicate instance
il.Emit (OpCodes.Ldstr, Tokens [Tokens.Length -1]);//load member name
il.Emit (OpCodes.Call, CompilerServices.miGetMembIinfoWithRefx);
il.Emit (OpCodes.Dup);
il.Emit (OpCodes.Brtrue, miOK);
il.Emit (OpCodes.Pop);//pop dup instance
il.Emit (OpCodes.Br, cancel);
il.MarkLabel (miOK);
il.Emit (OpCodes.Call, CompilerServices.miGetValWithRefx);
}
/// <summary>
/// Emit the MSIL instructions to set the target property of the binding expression
/// </summary>
/// <param name="il">current MSIL generator</param>
public void emitSetProperty(ILGenerator il) {
il.Emit (OpCodes.Ldstr, Tokens [Tokens.Length -1]);//load member name
il.Emit (OpCodes.Call, CompilerServices.miSetValWithRefx);
}
}
}
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