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79 lines
2.9 KiB
C
79 lines
2.9 KiB
C
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/**********************************************************************
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* File: lang_model.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 LanguageModel class abstracts a State machine that is modeled as a Trie
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// structure. The state machine models the language being recognized by the OCR
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// Engine
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// This is an abstract class that is to be inherited by any language model
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#ifndef LANG_MODEL_H
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#define LANG_MODEL_H
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#include "lang_mod_edge.h"
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#include "char_altlist.h"
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#include "char_set.h"
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#include "tuning_params.h"
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namespace tesseract {
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class LangModel {
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public:
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LangModel() {
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ood_enabled_ = true;
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numeric_enabled_ = true;
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word_list_enabled_ = true;
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punc_enabled_ = true;
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}
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virtual ~LangModel() {}
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// Returns an edge pointer to the Root
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virtual LangModEdge *Root() = 0;
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// Returns the edges that fan-out of the specified edge and their count
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virtual LangModEdge **GetEdges(CharAltList *alt_list,
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LangModEdge *parent_edge,
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int *edge_cnt) = 0;
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// Returns is a sequence of 32-bit characters are valid within this language
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// model or net. And EndOfWord flag is specified. If true, the sequence has
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// to end on a valid word. The function also optionally returns the list
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// of language model edges traversed to parse the string
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virtual bool IsValidSequence(const char_32 *str, bool eow_flag,
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LangModEdge **edge_array = NULL) = 0;
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virtual bool IsLeadingPunc(char_32 ch) = 0;
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virtual bool IsTrailingPunc(char_32 ch) = 0;
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virtual bool IsDigit(char_32 ch) = 0;
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// accessor functions
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inline bool OOD() { return ood_enabled_; }
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inline bool Numeric() { return numeric_enabled_; }
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inline bool WordList() { return word_list_enabled_; }
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inline bool Punc() { return punc_enabled_; }
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inline void SetOOD(bool ood) { ood_enabled_ = ood; }
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inline void SetNumeric(bool numeric) { numeric_enabled_ = numeric; }
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inline void SetWordList(bool word_list) { word_list_enabled_ = word_list; }
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inline void SetPunc(bool punc_enabled) { punc_enabled_ = punc_enabled; }
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protected:
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bool ood_enabled_;
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bool numeric_enabled_;
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bool word_list_enabled_;
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bool punc_enabled_;
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};
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}
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#endif // LANG_MODEL_H
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