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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.Collections.ObjectModel;
using System.Diagnostics;
using System.Reflection;
using bsn.GoldParser.Grammar;
namespace bsn.GoldParser.Semantic {
public class SemanticNonterminalTypeFactory<TBase, TOutput>: SemanticNonterminalFactory<TBase, TOutput> where TBase: SemanticToken where TOutput: TBase {
private readonly SemanticNonterminalTypeFactoryHelper<TBase>.Activator<TOutput> activator;
private readonly ReadOnlyCollection<Type> inputTypes;
public SemanticNonterminalTypeFactory(ConstructorInfo constructor, int[] parameterMapping, int handleCount, Type baseTokenType) {
if (constructor == null) {
throw new ArgumentNullException("constructor");
}
if (parameterMapping == null) {
throw new ArgumentNullException("parameterMapping");
}
if (baseTokenType == null) {
throw new ArgumentNullException("baseTokenType");
}
ParameterInfo[] parameters = constructor.GetParameters();
if (parameterMapping.Length != parameters.Length) {
throw new ArgumentException("The parameter mapping must have exactly as many items as the constructor has parameters", "parameterMapping");
}
int requiredHandles = 0;
foreach (int i in parameterMapping) {
if (i >= 0) {
requiredHandles++;
}
}
if (handleCount < requiredHandles) {
throw new ArgumentOutOfRangeException("handleCount");
}
Type[] inputTypeBuilder = new Type[handleCount];
for (int i = 0; i < handleCount; i++) {
inputTypeBuilder[i] = baseTokenType;
}
foreach (ParameterInfo parameter in parameters) {
int tokenIndex = parameterMapping[parameter.Position];
if (tokenIndex != -1) {
inputTypeBuilder[tokenIndex] = parameter.ParameterType;
}
}
inputTypes = Array.AsReadOnly(inputTypeBuilder);
activator = SemanticNonterminalTypeFactoryHelper<TBase>.CreateActivator(this, constructor, parameterMapping);
Debug.Assert(activator != null);
}
public override ReadOnlyCollection<Type> InputTypes {
get {
return inputTypes;
}
}
public override TOutput Create(Rule rule, IList<TBase> tokens) {
Debug.Assert((tokens != null) && (tokens.Count == inputTypes.Count));
return activator(tokens);
}
}
}
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