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using System;
using System.Collections.Generic;
using System.Reflection;
using System.Text;
using System.Text.RegularExpressions;
using UnityEngine;
namespace AdvancedInspector
{
/// <summary>
/// When a property is flagged this way, a help box is added after the inspector's field.
/// </summary>
[AttributeUsage(AttributeTargets.Field | AttributeTargets.Property | AttributeTargets.Method | AttributeTargets.Class | AttributeTargets.Struct, AllowMultiple = true)]
public class HelpAttribute : Attribute, IRuntimeAttribute<HelpAttribute>
{
public const string IsNull = "HelpAttribute.IsValueNull";
public const string IsNullOrEmpty = "HelpAttribute.IsStringNullOrEmpty";
public const string IsMatch = "HelpAttribute.IsRegexMatch";
public delegate HelpAttribute HelpDelegate();
public delegate HelpAttribute HelpStaticDelegate(HelpAttribute help, object instance, object value);
private HelpType type;
/// <summary>
/// Help type.
/// Displays a specific icon.
/// </summary>
public HelpType Type
{
get { return type; }
set { type = value; }
}
private string message;
/// <summary>
/// Help message.
/// </summary>
public string Message
{
get { return message; }
set { message = value; }
}
private HelpPosition position = HelpPosition.After;
/// <summary>
/// By default, the helpbox is drawn after the field.
/// If this is false, it is drawn before the field.
/// </summary>
public HelpPosition Position
{
get { return position; }
set { position = value; }
}
private string regex;
/// <summary>
/// When using the IsRegex conditional, this string is used as a regular expresion.
/// </summary>
public string Regex
{
get { return regex; }
set { regex = value; }
}
#region IRuntime Implementation
private string methodName = "";
public string MethodName
{
get { return methodName; }
}
public Type Template
{
get { return typeof(HelpDelegate); }
}
public Type TemplateStatic
{
get { return typeof(HelpStaticDelegate); }
}
private List<Delegate> delegates = new List<Delegate>();
public List<Delegate> Delegates
{
get { return delegates; }
set { delegates = value; }
}
public HelpAttribute Invoke(int index, object instance, object value)
{
if (delegates.Count == 0 || index >= delegates.Count)
return this;
try
{
if (delegates[index].Target == null)
{
return delegates[0].DynamicInvoke(this, instance, value) as HelpAttribute;
}
else
{
return delegates[0].DynamicInvoke() as HelpAttribute;
}
}
catch (Exception e)
{
if (e is TargetInvocationException)
e = ((TargetInvocationException)e).InnerException;
Debug.LogError(string.Format("Invoking a method failed while trying to retrieve a Help attribute. The exception was \"{0}\".", e.Message));
return null;
}
}
#endregion
public HelpAttribute(string methodName)
: this(methodName, HelpType.None, HelpPosition.After, "") { }
public HelpAttribute(string methodName, HelpType type, string message)
: this(methodName, type, HelpPosition.After, message) { }
public HelpAttribute(HelpType type, string message)
: this("", type, HelpPosition.After, message) { }
public HelpAttribute(HelpType type, HelpPosition position, string message)
: this("", type, position, message) { }
public HelpAttribute(string methodName, HelpType type, HelpPosition position, string message)
{
this.methodName = methodName;
this.type = type;
this.position = position;
this.message = message;
}
public HelpAttribute(Delegate method)
{
this.delegates.Add(method);
}
private static HelpAttribute IsValueNull(HelpAttribute help, object instance, object value)
{
if (value == null || (value is UnityEngine.Object && ((UnityEngine.Object)value) == null))
{
return help;
}
return null;
}
private static HelpAttribute IsStringNullOrEmpty(HelpAttribute help, object instance, object value)
{
if (value is string && string.IsNullOrEmpty((string)value))
return help;
return null;
}
private static HelpAttribute IsRegexMatch(HelpAttribute help, object instance, object value)
{
if (value == null)
return null;
string text = value.ToString();
if (System.Text.RegularExpressions.Regex.IsMatch(text, help.regex))
return help;
return null;
}
}
/// <summary>
/// Because the internal enum for help display is Editor only.
/// </summary>
public enum HelpType
{
None = 0,
Info = 1,
Warning = 2,
Error = 3,
}
/// <summary>
/// The position where the help box should be placed.
/// </summary>
public enum HelpPosition
{
After,
Before
}
}
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