mirror of
https://github.com/JakubMelka/PDF4QT.git
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112 lines
4.2 KiB
C++
112 lines
4.2 KiB
C++
// Copyright (C) 2020-2021 Jakub Melka
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//
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// This file is part of Pdf4Qt.
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//
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// Pdf4Qt is free software: you can redistribute it and/or modify
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// it under the terms of the GNU Lesser General Public License as published by
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// the Free Software Foundation, either version 3 of the License, or
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// with the written consent of the copyright owner, any later version.
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//
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// Pdf4Qt 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 Lesser General Public License for more details.
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//
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// You should have received a copy of the GNU Lesser General Public License
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// along with Pdf4Qt. If not, see <https://www.gnu.org/licenses/>.
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#ifndef PDFDOCUMENTTEXTFLOW_H
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#define PDFDOCUMENTTEXTFLOW_H
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#include "pdfglobal.h"
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#include "pdfexception.h"
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namespace pdf
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{
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class PDFDocument;
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/// Text flow extracted from document. Text flow can be created \p PDFDocumentTextFlowFactory.
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/// Flow can contain various items, not just text ones. Also, some manipulation functions
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/// are available, they can modify text flow by various content.
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class Pdf4QtLIBSHARED_EXPORT PDFDocumentTextFlow
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{
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public:
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enum Flag
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{
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None = 0x0000, ///< No text flag
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Text = 0x0001, ///< Ordinary text
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PageStart = 0x0002, ///< Page start marker
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PageEnd = 0x0004, ///< Page end marker
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StructureTitle = 0x0008, ///< Structure tree item title
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StructureLanguage = 0x0010, ///< Structure tree item language
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StructureAlternativeDescription = 0x0020, ///< Structure tree item alternative description
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StructureExpandedForm = 0x0040, ///< Structure tree item expanded form of text
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StructureActualText = 0x0080, ///< Structure tree item actual text
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StructurePhoneme = 0x0100, ///< Structure tree item phoneme
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StructureItemStart = 0x0200, ///< Start of structure tree item
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StructureItemEnd = 0x0400, ///< End of structure tree item
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};
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Q_DECLARE_FLAGS(Flags, Flag)
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struct Item
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{
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Flags flags = None;
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PDFInteger pageIndex = 0;
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QString text;
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};
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using Items = std::vector<Item>;
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explicit PDFDocumentTextFlow() = default;
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explicit PDFDocumentTextFlow(Items&& items) :
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m_items(qMove(items))
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{
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}
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const Items& getItems() const { return m_items; }
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/// Returns true, if text flow is empty
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bool isEmpty() const { return m_items.empty(); }
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private:
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Items m_items;
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};
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/// This factory creates text flow for whole document
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class Pdf4QtLIBSHARED_EXPORT PDFDocumentTextFlowFactory
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{
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public:
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explicit PDFDocumentTextFlowFactory() = default;
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enum class Algorithm
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{
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Auto, ///< Determine best text layout algorithm automatically
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Layout, ///< Use text layout recognition using docstrum algorithm
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Content, ///< Use content-stream text layout recognition (usually unreliable), but fast
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Structure, ///< Use structure oriented text layout recognition (requires tagged document)
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};
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/// Performs document text flow analysis using given algorithm. Text flow
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/// can be performed only for given subset of pages, if required.
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/// \param document Document
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/// \param pageIndices Analyzed page indices
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/// \param algorithm Algorithm
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PDFDocumentTextFlow create(const PDFDocument* document,
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const std::vector<PDFInteger>& pageIndices,
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Algorithm algorithm);
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/// Has some error/warning occured during text layout creation?
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bool hasError() const { return !m_errors.isEmpty(); }
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/// Returns a list of errors/warnings
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const QList<PDFRenderError>& getErrors() const { return m_errors; }
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private:
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QList<PDFRenderError> m_errors;
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};
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} // namespace pdf
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#endif // PDFDOCUMENTTEXTFLOW_H
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