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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;
using System.Collections.Generic;
using System.Diagnostics;
using System.IO;
using bsn.GoldParser.Grammar;
using bsn.GoldParser.Parser;
namespace bsn.GoldParser.Semantic {
public class SemanticProcessor<T>: LalrProcessor<T> where T: SemanticToken {
private readonly SemanticActions<T> actions;
public SemanticProcessor(TextReader reader, SemanticActions<T> actions): this(actions.CreateTokenizer(reader), actions) {}
public SemanticProcessor(ITokenizer<T> tokenizer, SemanticActions<T> actions): base(tokenizer) {
if (actions == null) {
throw new ArgumentNullException("actions");
}
if (tokenizer.Grammar != actions.Grammar) {
throw new ArgumentException("Mismatch of tokenizer and action grammars");
}
this.actions = actions;
}
protected override bool CanTrim(Rule rule) {
return false;
}
protected override T CreateReduction(Rule rule, IList<T> children) {
SemanticNonterminalFactory<T> factory;
if (actions.TryGetNonterminalFactory(rule, out factory)) {
Debug.Assert(factory != null);
return factory.CreateAndInitialize(rule, children);
}
throw new InvalidOperationException(string.Format("Missing a token type for the rule {0}", rule.Definition));
}
}
}
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