using System;
using System.Collections.Generic;

namespace AspClassic.Parser;

/// <summary>
/// A punctuation token.
/// </summary>
public sealed class PunctuatorToken : Token
{
	private static Dictionary<string, TokenType> PunctuatorTable;

	private static void AddPunctuator(Dictionary<string, TokenType> table, string punctuator, TokenType type)
	{
		table.Add(punctuator, type);
		table.Add(Scanner.MakeFullWidth(punctuator), type);
	}

	internal static TokenType TokenTypeFromString(string s)
	{
		if (PunctuatorTable == null)
		{
			Dictionary<string, TokenType> Table = new Dictionary<string, TokenType>(StringComparer.InvariantCulture);
			AddPunctuator(Table, "(", TokenType.LeftParenthesis);
			AddPunctuator(Table, ")", TokenType.RightParenthesis);
			AddPunctuator(Table, "{", TokenType.LeftCurlyBrace);
			AddPunctuator(Table, "}", TokenType.RightCurlyBrace);
			AddPunctuator(Table, "!", TokenType.Exclamation);
			AddPunctuator(Table, "#", TokenType.Pound);
			AddPunctuator(Table, ",", TokenType.Comma);
			AddPunctuator(Table, ".", TokenType.Period);
			AddPunctuator(Table, ":", TokenType.Colon);
			AddPunctuator(Table, ":=", TokenType.ColonEquals);
			AddPunctuator(Table, "&", TokenType.Ampersand);
			AddPunctuator(Table, "&=", TokenType.AmpersandEquals);
			AddPunctuator(Table, "*", TokenType.Star);
			AddPunctuator(Table, "*=", TokenType.StarEquals);
			AddPunctuator(Table, "+", TokenType.Plus);
			AddPunctuator(Table, "+=", TokenType.PlusEquals);
			AddPunctuator(Table, "-", TokenType.Minus);
			AddPunctuator(Table, "-=", TokenType.MinusEquals);
			AddPunctuator(Table, "/", TokenType.ForwardSlash);
			AddPunctuator(Table, "/=", TokenType.ForwardSlashEquals);
			AddPunctuator(Table, "\\", TokenType.BackwardSlash);
			AddPunctuator(Table, "\\=", TokenType.BackwardSlashEquals);
			AddPunctuator(Table, "^", TokenType.Caret);
			AddPunctuator(Table, "^=", TokenType.CaretEquals);
			AddPunctuator(Table, "<", TokenType.LessThan);
			AddPunctuator(Table, "<=", TokenType.LessThanEquals);
			AddPunctuator(Table, "=<", TokenType.LessThanEquals);
			AddPunctuator(Table, "=", TokenType.Equals);
			AddPunctuator(Table, "<>", TokenType.NotEquals);
			AddPunctuator(Table, ">", TokenType.GreaterThan);
			AddPunctuator(Table, ">=", TokenType.GreaterThanEquals);
			AddPunctuator(Table, "=>", TokenType.GreaterThanEquals);
			AddPunctuator(Table, "<<", TokenType.LessThanLessThan);
			AddPunctuator(Table, "<<=", TokenType.LessThanLessThanEquals);
			AddPunctuator(Table, ">>", TokenType.GreaterThanGreaterThan);
			AddPunctuator(Table, ">>=", TokenType.GreaterThanGreaterThanEquals);
			PunctuatorTable = Table;
		}
		if (!PunctuatorTable.ContainsKey(s))
		{
			return TokenType.None;
		}
		return PunctuatorTable[s];
	}

	/// <summary>
	/// Constructs a new punctuator token.
	/// </summary>
	/// <param name="type">The punctuator token type.</param>
	/// <param name="span">The location of the punctuator.</param>
	public PunctuatorToken(TokenType type, Span span)
		: base(type, span)
	{
		if (type < TokenType.LeftParenthesis || type > TokenType.GreaterThanGreaterThanEquals)
		{
			throw new ArgumentOutOfRangeException("type");
		}
	}
}