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// bsn GoldParser .NET Engine
// --------------------------
//
// Copyright 2009, 2010 by Ars�ne von Wyss - avw@gmx.ch
//
// Development has been supported by Sirius Technologies AG, Basel
//
// Source:
//
// https://bsn-goldparser.googlecode.com/hg/
//
// License:
//
// The library is distributed under the GNU Lesser General Public License:
// http://www.gnu.org/licenses/lgpl.html
//
// This program is free software: you can redistribute it and/or modify
// it under the terms of the GNU Lesser General Public License as published by
// the Free Software Foundation, either version 3 of the License, or
// (at your option) any later version.
//
// This program is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
// GNU Lesser General Public License for more details.
//
// You should have received a copy of the GNU Lesser General Public License
// along with this program. If not, see <http://www.gnu.org/licenses/>.
//
using System;
namespace bsn.GoldParser.Grammar {
/// <summary>
/// State of LR parser.
/// </summary>
public class LalrState: GrammarObject<LalrState> {
private LalrAction[] actions;
private LalrAction[] transitionVector;
/// <summary>
/// Creates a new instance of the <c>LalrState</c> class
/// </summary>
/// <param name="index">Index of the LR state in the LR state table.</param>
internal LalrState(CompiledGrammar owner, int index): base(owner, index) {
if (owner == null) {
throw new ArgumentNullException("owner");
}
}
/// <summary>
/// Gets LR state action count.
/// </summary>
public int ActionCount {
get {
return actions.Length;
}
}
/// <summary>
/// Returns state action by its index.
/// </summary>
/// <param name="index">State action index.</param>
/// <returns>LR state action for the given index.</returns>
public LalrAction GetAction(int index) {
return actions[index];
}
/// <summary>
/// Returns LR state action by symbol index.
/// </summary>
/// <param name="symbol">The symbol.</param>
/// <returns>LR state action object.</returns>
public LalrAction GetActionBySymbol(Symbol symbol) {
if (symbol == null) {
throw new ArgumentNullException("symbol");
}
return transitionVector[symbol.Index];
}
public override string ToString() {
return string.Format("LALR State {0}", Index);
}
/// <summary>
/// Initializes the specified actions.
/// </summary>
/// <param name="actions">List of all available LR actions in this state.</param>
/// <param name="transitionVector">Transition vector which has symbol index as an index.</param>
internal void Initialize(LalrAction[] actions, LalrAction[] transitionVector) {
if (actions == null) {
throw new ArgumentNullException("actions");
}
if (transitionVector == null) {
throw new ArgumentNullException("transitionVector");
}
if ((this.actions != null) || (this.transitionVector != null)) {
throw new InvalidOperationException("The LALR state is already initialized.");
}
this.actions = actions;
this.transitionVector = transitionVector;
}
}
}
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