// <file>
//     <copyright see="prj:///doc/copyright.txt"/>
//     <license see="prj:///doc/license.txt"/>
//     <owner name="Mike Krüger" email="mike@icsharpcode.net"/>
//     <version>$Revision: 3863 $</version>
// </file>

using System;

namespace ICSharpCode.Core
{
	/// <summary>
	/// Compares two strings.
	/// The strings are passed through the StringParser, so it is possible to compare
	/// SharpDevelop properties.<br/>
	/// Useful if you want to run a command only when a setting is active to prevent
	/// loading your addin if that setting isn't set.
	/// </summary>
	/// <attribute name="string">
	/// The first string.
	/// </attribute>
	/// <attribute name="equals">
	/// The second string.
	/// </attribute>
	/// <attribute name="comparisonType">
	/// The mode of the comparison: a field of the System.StringComparison enumeration. The default is
	/// 'OrdinalIgnoreCase'.
	/// </attribute>
	/// <example title="Check the value of a property in the PropertyService">
	/// &lt;Condition name = "Compare" string = "${property:SharpDevelop.FiletypesRegisterStartup}" equals = "True"&gt;
	/// </example>
	public class CompareConditionEvaluator : IConditionEvaluator
	{
		public bool IsValid(object caller, Condition condition)
		{
			string comparisonTypeText = condition.Properties["comparisonType"];
			StringComparison comparisonType;
			if (string.IsNullOrEmpty(comparisonTypeText))
				comparisonType = StringComparison.OrdinalIgnoreCase;
			else
				comparisonType = (StringComparison)Enum.Parse(typeof(StringComparison), comparisonTypeText);
			
			return string.Equals(StringParser.Parse(condition.Properties["string"]),
			                     StringParser.Parse(condition.Properties["equals"]),
			                     comparisonType);
		}
	}
}