// Licensed to the .NET Foundation under one or more agreements.
// The .NET Foundation licenses this file to you under the MIT license.

using System.Collections.Generic;
using System.Xml.Xsl.Qil;

namespace System.Xml.Xsl.XPath
{
    // <spec>http://www.w3.org/TR/xslt20/#dt-focus</spec>
    internal interface IFocus
    {
        // The context item:     the item currently being processed
        QilNode? GetCurrent();

        // The context position: the position of the context item within the sequence of items
        // currently being processed
        QilNode GetPosition();

        // The context size:     the number of items in the sequence of items currently being processed
        QilNode GetLast();
    }

    internal interface IXPathEnvironment : IFocus
    {
        XPathQilFactory Factory { get; }

        // Resolution of variables, functions, and prefixes
        QilNode ResolveVariable(string prefix, string name);
        QilNode ResolveFunction(string prefix, string name, IList<QilNode> args, IFocus env);
        string ResolvePrefix(string prefix);
    }
}