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// bsn GoldParser .NET Engine
// --------------------------
//
// Copyright 2009, 2010 by Arsène 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.Collections.ObjectModel;
using System.Diagnostics;
using bsn.GoldParser.Grammar;
namespace bsn.GoldParser.Semantic {
public sealed class SemanticTrimFactory<TBase>: SemanticNonterminalFactory<TBase> where TBase: SemanticToken {
private readonly int handleIndex;
private readonly SemanticActions<TBase> owner;
private readonly Rule rule;
internal SemanticTrimFactory(SemanticActions<TBase> owner, Rule rule, int handleIndex) {
if (owner == null) {
throw new ArgumentNullException("owner");
}
if (rule == null) {
throw new ArgumentNullException("rule");
}
if ((handleIndex < 0) || (handleIndex >= rule.SymbolCount)) {
throw new ArgumentOutOfRangeException("handleIndex");
}
this.owner = owner;
this.handleIndex = handleIndex;
this.rule = rule;
}
public override ReadOnlyCollection<Type> InputTypes {
get {
return Array.AsReadOnly(new[] {GetRuleType()});
}
}
public override Type OutputType {
get {
return GetRuleType();
}
}
protected internal override Symbol RedirectForOutputType {
get {
return GetTrimSymbol();
}
}
public override TBase CreateAndInitialize(Rule rule, IList<TBase> tokens) {
Debug.Assert(this.rule == rule);
TBase result = tokens[handleIndex];
Debug.Assert(OutputType.IsAssignableFrom(result.GetType()));
return result;
}
protected internal override IEnumerable<Symbol> GetInputSymbols(Rule rule) {
yield return GetTrimSymbol();
}
private Type GetRuleType() {
if (owner.Initialized) {
return owner.GetSymbolOutputType(GetTrimSymbol());
}
return typeof(TBase);
}
private Symbol GetTrimSymbol() {
return rule[handleIndex];
}
}
}
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