45 lines
1.5 KiB
C++
45 lines
1.5 KiB
C++
/*
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* Copyright (C) 2005 Maarten Keijzer
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of version 2 of the GNU General Public License as
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* published by the Free Software Foundation.
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*
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* This program 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
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
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*/
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#ifndef TREEBUILDER_H_
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#define TREEBUILDER_H_
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#include "sym/Sym.h"
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#include "LanguageTable.h"
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class TreeBuilder {
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const LanguageTable& table;
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// probability of selecting a var versus a const when the choice boils down to selecting a terminal
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double vcprob;
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Sym make_terminal() const;
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public:
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TreeBuilder(const LanguageTable& t) : table(t), vcprob(0.9) {};
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TreeBuilder(const LanguageTable& t, double vc) : table(t), vcprob(vc) {};
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void set_var_vs_const_probability(double p) { vcprob = p; }
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Sym build_tree(unsigned max_depth, bool grow) const;
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void build_tree(Sym& tree, unsigned max_depth, bool grow) const { tree = build_tree(max_depth, grow); }
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};
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#endif
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