mirror of
https://github.com/moses-smt/mosesdecoder.git
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117 lines
2.8 KiB
C++
117 lines
2.8 KiB
C++
/***********************************************************************
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Moses - statistical machine translation system
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Copyright (C) 2006-2012 University of Edinburgh
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This library is free software; you can redistribute it and/or
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modify it under the terms of the GNU Lesser General Public
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License as published by the Free Software Foundation; either
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version 2.1 of the License, or (at your option) any later version.
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This library is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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Lesser General Public License for more details.
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You should have received a copy of the GNU Lesser General Public
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License along with this library; if not, write to the Free Software
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Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
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***********************************************************************/
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#pragma once
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#ifndef PCFG_SYNTAX_TREE_H_
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#define PCFG_SYNTAX_TREE_H_
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#include <cassert>
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#include <vector>
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namespace Moses
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{
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namespace PCFG
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{
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// Base class for SyntaxTree, AgreementTree, and friends.
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template<typename T, typename DerivedType>
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class SyntaxTreeBase
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{
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public:
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// Constructors
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SyntaxTreeBase(const T &label)
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: label_(label)
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, children_()
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, parent_(0) {}
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SyntaxTreeBase(const T &label, const std::vector<DerivedType *> &children)
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: label_(label)
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, children_(children)
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, parent_(0) {}
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// Destructor
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virtual ~SyntaxTreeBase();
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const T &label() const {
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return label_;
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}
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const DerivedType *parent() const {
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return parent_;
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}
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DerivedType *parent() {
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return parent_;
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}
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const std::vector<DerivedType *> &children() const {
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return children_;
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}
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std::vector<DerivedType *> &children() {
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return children_;
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}
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void set_label(const T &label) {
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label_ = label;
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}
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void set_parent(DerivedType *parent) {
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parent_ = parent;
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}
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void set_children(const std::vector<DerivedType *> &c) {
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children_ = c;
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}
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bool IsLeaf() const {
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return children_.empty();
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}
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bool IsPreterminal() const {
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return children_.size() == 1 && children_[0]->IsLeaf();
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}
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void AddChild(DerivedType *child) {
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children_.push_back(child);
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}
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private:
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T label_;
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std::vector<DerivedType *> children_;
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DerivedType *parent_;
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};
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template<typename T>
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class SyntaxTree : public SyntaxTreeBase<T, SyntaxTree<T> >
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{
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public:
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typedef SyntaxTreeBase<T, SyntaxTree<T> > BaseType;
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SyntaxTree(const T &label) : BaseType(label) {}
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SyntaxTree(const T &label, const std::vector<SyntaxTree *> &children)
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: BaseType(label, children) {}
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};
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template<typename T, typename DerivedType>
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SyntaxTreeBase<T, DerivedType>::~SyntaxTreeBase()
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{
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for (std::size_t i = 0; i < children_.size(); ++i) {
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delete children_[i];
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}
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}
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} // namespace PCFG
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} // namespace Moses
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#endif
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