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