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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 System.Text;
using bsn.GoldParser.Grammar;
namespace bsn.GoldParser.Parser {
/// <summary>
/// A reduction token, which contains the child tokens reduced with the <see cref="ParentRule"/>.
/// </summary>
public class Reduction: Token {
private readonly Rule rule;
private readonly ReadOnlyCollection<Token> tokens;
internal Reduction(Rule rule, IList<Token> tokens): base() {
if (rule == null) {
throw new ArgumentNullException("rule");
}
if (tokens == null) {
throw new ArgumentNullException("tokens");
}
this.rule = rule;
Token[] tokenArray = new Token[tokens.Count];
tokens.CopyTo(tokenArray, 0);
this.tokens = Array.AsReadOnly(tokenArray);
}
public ReadOnlyCollection<Token> Children {
[DebuggerStepThrough]
get {
return tokens;
}
}
public override sealed LineInfo Position {
[DebuggerStepThrough]
get {
return tokens.Count > 0 ? tokens[0].Position : default(LineInfo);
}
}
public override sealed Symbol Symbol {
[DebuggerStepThrough]
get {
return rule.RuleSymbol;
}
}
public Rule Rule {
get {
return rule;
}
}
public override string ToString() {
StringBuilder sb = new StringBuilder();
foreach (Token token in tokens) {
if (sb.Length > 0) {
sb.Append(' ');
}
sb.Append(token);
}
return sb.ToString();
}
}
}
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