tesseract
5.0.0-alpha-619-ge9db
ligature_table.h
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/**********************************************************************
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* File: ligature_table.h
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* Description: Class for adding and removing optional latin ligatures,
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* conditional on codepoint support by a specified font
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* (if specified).
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* Author: Ranjith Unnikrishnan
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* Created: Mon Nov 18 2013
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*
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* (C) Copyright 2013, 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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#ifndef TRAININGDATA_LIGATURE_TABLE_H_
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#define TRAININGDATA_LIGATURE_TABLE_H_
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#include <memory>
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#include <string>
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#include <unordered_map>
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#include "
util.h
"
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namespace
tesseract
{
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class
PangoFontInfo;
// defined in pango_font_info.h
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// Map to substitute strings for ligatures.
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using
LigHash
= std::unordered_map<std::string, std::string, StringHash>;
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class
LigatureTable {
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public
:
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// Get a static instance of this class.
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static
LigatureTable
*
Get
();
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// Convert the utf8 string so that ligaturizable sequences, such as "fi" get
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// replaced by the (utf8 code for) appropriate ligature characters. Only do so
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// if the corresponding ligature character is renderable in the current font.
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std::string
AddLigatures
(
const
std::string
& str,
const
PangoFontInfo* font)
const
;
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// Remove all ligatures.
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std::string
RemoveLigatures
(
const
std::string
& str)
const
;
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// Remove only custom ligatures (eg. "ct") encoded in the private-use-area.
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std::string
RemoveCustomLigatures
(
const
std::string
& str)
const
;
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const
LigHash
&
norm_to_lig_table
()
const
{
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return
norm_to_lig_table_
;
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}
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const
LigHash
&
lig_to_norm_table
()
const
{
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return
lig_to_norm_table_
;
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}
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protected
:
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LigatureTable
();
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// Initialize the hash tables mapping between ligature strings and the
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// corresponding ligature characters.
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void
Init
();
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static
std::unique_ptr<LigatureTable>
instance_
;
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LigHash
norm_to_lig_table_
;
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LigHash
lig_to_norm_table_
;
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int
min_lig_length_
;
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int
max_lig_length_
;
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int
min_norm_length_
;
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int
max_norm_length_
;
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private
:
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LigatureTable
(
const
LigatureTable
&);
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void
operator=(
const
LigatureTable
&);
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};
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}
// namespace tesseract
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#endif // OCR_TRAININGDATA_TYPESETTING_LIGATURE_TABLE_H_
string
std::string string
Definition:
equationdetect_test.cc:21
tesseract::LigatureTable::lig_to_norm_table_
LigHash lig_to_norm_table_
Definition:
ligature_table.h:84
tesseract::LigatureTable
Definition:
ligature_table.h:55
tesseract::LigatureTable::instance_
static std::unique_ptr< LigatureTable > instance_
Definition:
ligature_table.h:82
tesseract::LigatureTable::max_lig_length_
int max_lig_length_
Definition:
ligature_table.h:86
util.h
tesseract::LigHash
std::unordered_map< std::string, std::string, StringHash > LigHash
Definition:
ligature_table.h:53
tesseract::LigatureTable::LigatureTable
LigatureTable()
Definition:
ligature_table.cpp:78
tesseract::LigatureTable::lig_to_norm_table
const LigHash & lig_to_norm_table() const
Definition:
ligature_table.h:72
tesseract::LigatureTable::Get
static LigatureTable * Get()
Definition:
ligature_table.cpp:70
tesseract
Definition:
baseapi.h:65
tesseract::LigatureTable::norm_to_lig_table
const LigHash & norm_to_lig_table() const
Definition:
ligature_table.h:69
tesseract::LigatureTable::Init
void Init()
Definition:
ligature_table.cpp:81
tesseract::LigatureTable::norm_to_lig_table_
LigHash norm_to_lig_table_
Definition:
ligature_table.h:83
tesseract::LigatureTable::RemoveCustomLigatures
std::string RemoveCustomLigatures(const std::string &str) const
Definition:
ligature_table.cpp:148
tesseract::LigatureTable::min_lig_length_
int min_lig_length_
Definition:
ligature_table.h:85
tesseract::LigatureTable::AddLigatures
std::string AddLigatures(const std::string &str, const PangoFontInfo *font) const
Definition:
ligature_table.cpp:174
tesseract::LigatureTable::min_norm_length_
int min_norm_length_
Definition:
ligature_table.h:87
tesseract::LigatureTable::max_norm_length_
int max_norm_length_
Definition:
ligature_table.h:88
tesseract::LigatureTable::RemoveLigatures
std::string RemoveLigatures(const std::string &str) const
Definition:
ligature_table.cpp:129
src
training
ligature_table.h
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