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// Michael Hutchinson <mhutchinson@novell.com>
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// Copyright (C) 2008 Novell, Inc (http://www.novell.com)
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// Permission is hereby granted, free of charge, to any person obtaining
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// a copy of this software and associated documentation files (the
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// "Software"), to deal in the Software without restriction, including
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// without limitation the rights to use, copy, modify, merge, publish,
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// distribute, sublicense, and/or sell copies of the Software, and to
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// permit persons to whom the Software is furnished to do so, subject to
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// the following conditions:
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// The above copyright notice and this permission notice shall be
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// included in all copies or substantial portions of the Software.
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// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
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// EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
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// MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
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// NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
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// LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
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// OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
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// WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
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using System.Diagnostics;
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using System.Collections.Generic;
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namespace MonoDevelop.Xml.StateEngine
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public abstract class State
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/// When the <see cref="Parser"/> advances by one character, it calls this method
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/// on the currently active <see cref="State"/> to determine the next state.
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/// <param name="c">The current character.</param>
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/// <param name="rollback"> If set non-null, the parser will be rolled back that number
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/// of characters (empty string means replay current char to the next state.
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/// Note that this will not change the DOM state.</param>
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/// The next state. A new or parent <see cref="State"/> will change the parser state;
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/// the current state or <see cref="null"/> will not.
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public abstract State PushChar (char c, IParseContext context, ref string rollback);
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public State Parent { get { return parent; } }
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protected void Adopt (State child)
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Debug.Assert (child.parent == null);
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public RootState RootState {
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return (this as RootState) ?? parent.RootState;
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public abstract class RootState : State
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public abstract XDocument CreateDocument ();