//
// TokenType.cs
//
// Author:
//   Marek Sieradzki (marek.sieradzki@gmail.com)
//   Jaroslaw Kowalski <jaak@jkowalski.net>
// 
// (C) 2006 Marek Sieradzki
// (C) 2004-2006 Jaroslaw Kowalski
//
// 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;

namespace Microsoft.Build.BuildEngine {

	internal class Token {
	
		string		tokenValue;
		TokenType	tokenType;
	
		public Token (string tokenValue, TokenType tokenType, int position)
		{
			this.tokenValue = tokenValue;
			this.tokenType = tokenType;
			this.Position = position + 1;
		}
		
		public string Value {
			get { return tokenValue; }
		}
		
		public TokenType Type {
			get { return tokenType; }
		}

		// this is 1-based
		public int Position {
			get; private set;
		}

		public static string TypeAsString (TokenType tokenType)
		{
			switch (tokenType) {
				case TokenType.Item:return "@";
				case TokenType.Property:return "$";
				case TokenType.Metadata:return "%";
				case TokenType.Transform:return "->";
				case TokenType.Less:return "<";
				case TokenType.Greater:return ">";
				case TokenType.LessOrEqual:return "<=";
				case TokenType.GreaterOrEqual:return ">=";
				case TokenType.Equal:return "=";
				case TokenType.NotEqual:return "!=";
				case TokenType.LeftParen:return "(";
				case TokenType.RightParen:return ")";
				case TokenType.Dot:return ".";
				case TokenType.Comma:return ",";
				case TokenType.Not:return "!";
				case TokenType.And:return "and";
				case TokenType.Or:return "or";
				case TokenType.Apostrophe:return "'";
				default: return tokenType.ToString ();
			}
		}

		public override string ToString ()
		{
			if (tokenType == TokenType.EOF || tokenType == TokenType.BOF)
				return String.Format ("{0} at character position {1}", tokenType.ToString (), Position);

			return String.Format ("\"{0}\" at character position {1}", tokenValue, Position);
		}
	}
	
	internal enum TokenType {
		EOF,
		BOF,
		Number,
		String,
		//Keyword,
		Punct,
		WhiteSpace,
		Item,
		Property,
		Metadata,
		FunctionName,
		Transform,
//		LiteralSubExpression,

		FirstPunct,

		Less,
		Greater,
		LessOrEqual,
		GreaterOrEqual,
		Equal,
		NotEqual,
		LeftParen,
		RightParen,
		Dot,
		Comma,
		Not,
		And,
		Or,
		Apostrophe,
		
		LastPunct,
		Invalid,
	}
}