/usr/include/tesseract/lang_mod_edge.h is in libtesseract-dev 3.02.01-6.
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* File: lang_mod_edge.h
* Description: Declaration of the Language Model Edge Base Class
* Author: Ahmad Abdulkader
* Created: 2007
*
* (C) Copyright 2008, Google Inc.
** Licensed under the Apache License, Version 2.0 (the "License");
** you may not use this file except in compliance with the License.
** You may obtain a copy of the License at
** http://www.apache.org/licenses/LICENSE-2.0
** Unless required by applicable law or agreed to in writing, software
** distributed under the License is distributed on an "AS IS" BASIS,
** WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
** See the License for the specific language governing permissions and
** limitations under the License.
*
**********************************************************************/
// The LangModEdge abstracts an Edge in the language model trie
// This is an abstract class that any Language Model Edge should inherit from
// It provides methods for:
// 1- Returns the class ID corresponding to the edge
// 2- If the edge is a valid EndOfWord (EOW)
// 3- If the edge is coming from a OutOfDictionary (OOF) state machine
// 4- If the edge is a Terminal (has no children)
// 5- A Hash of the edge that will be used to retrieve the edge
// quickly from the BeamSearch lattice
// 6- If two edges are identcial
// 7- Returns a verbal description of the edge (use by debuggers)
// 8- the language model cost of the edge (if any)
// 9- The string corresponding to this edge
// 10- Getting and setting the "Root" status of the edge
#ifndef LANG_MOD_EDGE_H
#define LANG_MOD_EDGE_H
#include "cube_tuning_params.h"
#include "char_set.h"
namespace tesseract {
class LangModEdge {
public:
LangModEdge() {}
virtual ~LangModEdge() {}
// The string corresponding to this edge
virtual const char_32 * EdgeString() const = 0;
// Returns the class ID corresponding to the edge
virtual int ClassID() const = 0;
// If the edge is the root edge
virtual bool IsRoot() const = 0;
// Set the Root flag
virtual void SetRoot(bool flag) = 0;
// If the edge is a valid EndOfWord (EOW)
virtual bool IsEOW() const = 0;
// is the edge is coming from a OutOfDictionary (OOF) state machine
virtual bool IsOOD() const = 0;
// Is the edge is a Terminal (has no children)
virtual bool IsTerminal() const = 0;
// Returns A hash of the edge that will be used to retrieve the edge
virtual unsigned int Hash() const = 0;
// Are the two edges identcial?
virtual bool IsIdentical(LangModEdge *edge) const = 0;
// a verbal description of the edge (use by debuggers)
virtual char *Description() const = 0;
// the language model cost of the edge (if any)
virtual int PathCost() const = 0;
};
}
#endif // LANG_MOD_EDGE_H
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