mirror of https://github.com/JakubMelka/PDF4QT.git
725 lines
27 KiB
C++
725 lines
27 KiB
C++
// Copyright (C) 2020 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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// (at your option) 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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#include "pdfdocumenttextflow.h"
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#include "pdfdocument.h"
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#include "pdfstructuretree.h"
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#include "pdfcompiler.h"
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#include "pdfexecutionpolicy.h"
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#include "pdfconstants.h"
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#include "pdfcms.h"
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namespace pdf
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{
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class PDFStructureTreeReferenceCollector : public PDFStructureTreeAbstractVisitor
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{
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public:
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explicit inline PDFStructureTreeReferenceCollector(std::map<PDFObjectReference, const PDFStructureItem*>* mapping) :
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m_mapping(mapping)
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{
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}
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virtual void visitStructureTree(const PDFStructureTree* structureTree) override;
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virtual void visitStructureElement(const PDFStructureElement* structureElement) override;
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virtual void visitStructureMarkedContentReference(const PDFStructureMarkedContentReference* structureMarkedContentReference) override;
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virtual void visitStructureObjectReference(const PDFStructureObjectReference* structureObjectReference) override;
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private:
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void addReference(const PDFStructureItem* structureObjectReference);
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std::map<PDFObjectReference, const PDFStructureItem*>* m_mapping;
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};
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void PDFStructureTreeReferenceCollector::visitStructureTree(const PDFStructureTree* structureTree)
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{
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addReference(structureTree);
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acceptChildren(structureTree);
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}
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void PDFStructureTreeReferenceCollector::visitStructureElement(const PDFStructureElement* structureElement)
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{
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addReference(structureElement);
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acceptChildren(structureElement);
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}
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void PDFStructureTreeReferenceCollector::visitStructureMarkedContentReference(const PDFStructureMarkedContentReference* structureMarkedContentReference)
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{
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addReference(structureMarkedContentReference);
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acceptChildren(structureMarkedContentReference);
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}
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void PDFStructureTreeReferenceCollector::visitStructureObjectReference(const PDFStructureObjectReference* structureObjectReference)
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{
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addReference(structureObjectReference);
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acceptChildren(structureObjectReference);
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}
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void PDFStructureTreeReferenceCollector::addReference(const PDFStructureItem* structureItem)
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{
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if (structureItem->getSelfReference().isValid())
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{
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(*m_mapping)[structureItem->getSelfReference()] = structureItem;
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}
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}
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struct PDFStructureTreeTextItem
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{
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enum class Type
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{
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StartTag,
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EndTag,
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Text
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};
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PDFStructureTreeTextItem() = default;
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PDFStructureTreeTextItem(Type type, const PDFStructureItem* item, QString text) :
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type(type), item(item), text(qMove(text))
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{
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}
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static PDFStructureTreeTextItem createText(QString text) { return PDFStructureTreeTextItem(Type::Text, nullptr, qMove(text)); }
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static PDFStructureTreeTextItem createStartTag(const PDFStructureItem* item) { return PDFStructureTreeTextItem(Type::StartTag, item, QString()); }
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static PDFStructureTreeTextItem createEndTag(const PDFStructureItem* item) { return PDFStructureTreeTextItem(Type::EndTag, item, QString()); }
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Type type = Type::Text;
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const PDFStructureItem* item = nullptr;
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QString text;
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};
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using PDFStructureTreeTextSequence = std::vector<PDFStructureTreeTextItem>;
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/// Text extractor for structure tree. Extracts sequences of structure items,
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/// page sequences are stored in \p textSequences. They can be accessed using
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/// getters.
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class PDFStructureTreeTextExtractor
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{
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public:
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enum Option
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{
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None = 0x0000,
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SkipArtifact = 0x0001, ///< Skip content marked as 'Artifact'
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AdjustReversedText = 0x0002, ///< Adjust reversed text
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CreateTreeMapping = 0x0004, ///< Create text mapping to structure tree item
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};
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Q_DECLARE_FLAGS(Options, Option)
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explicit PDFStructureTreeTextExtractor(const PDFDocument* document, const PDFStructureTree* tree, Options options);
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/// Performs text extracting algorithm. Only \p pageIndices
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/// pages are processed for text extraction.
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/// \param pageIndices Page indices
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void perform(const std::vector<PDFInteger>& pageIndices);
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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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/// Returns a list of unmatched text
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const QStringList& getUnmatchedText() const { return m_unmatchedText; }
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/// Returns text sequence for given page. If page number is invalid,
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/// then empty text sequence is returned.
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/// \param pageNumber Page number
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const PDFStructureTreeTextSequence& getTextSequence(PDFInteger pageNumber) const;
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/// Returns text for given structure tree item. If structure tree item
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/// is not found, then empty list is returned. This functionality
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/// requires, that \p CreateTreeMapping flag is being set.
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/// \param item Item
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const QStringList& getText(const PDFStructureItem* item) const;
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private:
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QList<PDFRenderError> m_errors;
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const PDFDocument* m_document;
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const PDFStructureTree* m_tree;
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QStringList m_unmatchedText;
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std::map<PDFInteger, PDFStructureTreeTextSequence> m_textSequences;
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std::map<const PDFStructureItem*, QStringList> m_textForItems;
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Options m_options;
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};
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Q_DECLARE_OPERATORS_FOR_FLAGS(PDFStructureTreeTextExtractor::Options)
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class PDFStructureTreeTextContentProcessor : public PDFPageContentProcessor
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{
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using BaseClass = PDFPageContentProcessor;
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public:
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explicit PDFStructureTreeTextContentProcessor(PDFRenderer::Features features,
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const PDFPage* page,
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const PDFDocument* document,
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const PDFFontCache* fontCache,
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const PDFCMS* cms,
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const PDFOptionalContentActivity* optionalContentActivity,
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QMatrix pagePointToDevicePointMatrix,
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const PDFMeshQualitySettings& meshQualitySettings,
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const PDFStructureTree* tree,
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const std::map<PDFObjectReference, const PDFStructureItem*>* mapping,
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PDFStructureTreeTextExtractor::Options extractorOptions) :
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BaseClass(page, document, fontCache, cms, optionalContentActivity, pagePointToDevicePointMatrix, meshQualitySettings),
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m_features(features),
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m_tree(tree),
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m_mapping(mapping),
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m_extractorOptions(extractorOptions)
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{
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}
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PDFStructureTreeTextSequence& takeSequence() { return m_textSequence; }
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QStringList& takeUnmatchedTexts() { return m_unmatchedText; }
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protected:
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virtual bool isContentSuppressedByOC(PDFObjectReference ocgOrOcmd) override;
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virtual bool isContentKindSuppressed(ContentKind kind) const override;
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virtual void performOutputCharacter(const PDFTextCharacterInfo& info) override;
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virtual void performMarkedContentBegin(const QByteArray& tag, const PDFObject& properties) override;
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virtual void performMarkedContentEnd() override;
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private:
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const PDFStructureItem* getStructureTreeItemFromMCID(PDFInteger mcid) const;
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void finishText();
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bool isArtifact() const;
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bool isReversedText() const;
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struct MarkedContentInfo
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{
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QByteArray tag;
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PDFInteger mcid = -1;
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const PDFStructureItem* structureTreeItem = nullptr;
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bool isArtifact = false;
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bool isReversedText = false;
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};
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PDFRenderer::Features m_features;
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const PDFStructureTree* m_tree;
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const std::map<PDFObjectReference, const PDFStructureItem*>* m_mapping;
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std::vector<MarkedContentInfo> m_markedContentInfoStack;
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QString m_currentText;
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PDFStructureTreeTextSequence m_textSequence;
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QStringList m_unmatchedText;
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PDFStructureTreeTextExtractor::Options m_extractorOptions;
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};
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void PDFStructureTreeTextContentProcessor::finishText()
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{
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m_currentText = m_currentText.trimmed();
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if (!m_currentText.isEmpty() && (!m_extractorOptions.testFlag(PDFStructureTreeTextExtractor::SkipArtifact) || !isArtifact()))
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{
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if (m_extractorOptions.testFlag(PDFStructureTreeTextExtractor::AdjustReversedText) && isReversedText())
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{
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QString reversed;
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reversed.reserve(m_currentText.size());
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for (auto it = m_currentText.rbegin(); it != m_currentText.rend(); ++it)
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{
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reversed.push_back(*it);
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}
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m_currentText = qMove(reversed);
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}
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m_textSequence.emplace_back(PDFStructureTreeTextItem::createText(qMove(m_currentText)));
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}
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m_currentText = QString();
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}
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bool PDFStructureTreeTextContentProcessor::isArtifact() const
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{
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return std::any_of(m_markedContentInfoStack.cbegin(), m_markedContentInfoStack.cend(), [](const auto& item) { return item.isArtifact; });
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}
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bool PDFStructureTreeTextContentProcessor::isReversedText() const
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{
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return std::any_of(m_markedContentInfoStack.cbegin(), m_markedContentInfoStack.cend(), [](const auto& item) { return item.isReversedText; });
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}
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void PDFStructureTreeTextContentProcessor::performMarkedContentBegin(const QByteArray& tag, const PDFObject& properties)
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{
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MarkedContentInfo info;
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info.tag = tag;
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if (properties.isDictionary())
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{
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const PDFDictionary* dictionary = properties.getDictionary();
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PDFObject mcid = dictionary->get("MCID");
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if (mcid.isInt())
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{
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// We must finish text, because we can have a sequence of text,
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// then subitem, then text, and followed by another subitem. They
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// can be interleaved.
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finishText();
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info.mcid = mcid.getInteger();
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info.structureTreeItem = getStructureTreeItemFromMCID(info.mcid);
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info.isArtifact = tag == "Artifact";
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info.isReversedText = tag == "ReversedChars";
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if (!info.structureTreeItem)
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{
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reportRenderError(RenderErrorType::Error, PDFTranslationContext::tr("Structure tree item for MCID %1 not found.").arg(info.mcid));
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}
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if (info.structureTreeItem)
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{
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m_textSequence.emplace_back(PDFStructureTreeTextItem::createStartTag(info.structureTreeItem));
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}
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}
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}
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m_markedContentInfoStack.emplace_back(qMove(info));
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}
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void PDFStructureTreeTextContentProcessor::performMarkedContentEnd()
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{
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MarkedContentInfo info = qMove(m_markedContentInfoStack.back());
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m_markedContentInfoStack.pop_back();
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if (info.mcid != -1)
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{
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finishText();
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if (info.structureTreeItem)
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{
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m_textSequence.emplace_back(PDFStructureTreeTextItem::createEndTag(info.structureTreeItem));
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}
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}
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// Check for text, which doesn't belong to any structure tree item
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if (m_markedContentInfoStack.empty())
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{
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m_currentText = m_currentText.trimmed();
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if (!m_currentText.isEmpty())
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{
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m_unmatchedText << qMove(m_currentText);
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}
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}
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}
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const PDFStructureItem* PDFStructureTreeTextContentProcessor::getStructureTreeItemFromMCID(PDFInteger mcid) const
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{
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auto it = m_mapping->find(m_tree->getParent(getStructuralParentKey(), mcid));
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if (it != m_mapping->cend())
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{
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return it->second;
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}
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return nullptr;
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}
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bool PDFStructureTreeTextContentProcessor::isContentSuppressedByOC(PDFObjectReference ocgOrOcmd)
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{
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if (m_features.testFlag(PDFRenderer::IgnoreOptionalContent))
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{
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return false;
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}
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return PDFPageContentProcessor::isContentSuppressedByOC(ocgOrOcmd);
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}
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bool PDFStructureTreeTextContentProcessor::isContentKindSuppressed(ContentKind kind) const
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{
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switch (kind)
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{
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case ContentKind::Shapes:
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case ContentKind::Text:
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case ContentKind::Images:
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case ContentKind::Shading:
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return true;
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case ContentKind::Tiling:
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return false; // Tiling can have text
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default:
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{
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Q_ASSERT(false);
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break;
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}
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}
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return false;
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}
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void PDFStructureTreeTextContentProcessor::performOutputCharacter(const PDFTextCharacterInfo& info)
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{
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if (!isContentSuppressed())
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{
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if (!info.character.isNull() && info.character != QChar(QChar::SoftHyphen))
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{
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m_currentText.push_back(info.character);
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}
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}
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}
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PDFStructureTreeTextExtractor::PDFStructureTreeTextExtractor(const PDFDocument* document, const PDFStructureTree* tree, Options options) :
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m_document(document),
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m_tree(tree),
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m_options(options)
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{
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}
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void PDFStructureTreeTextExtractor::perform(const std::vector<PDFInteger>& pageIndices)
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{
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std::map<PDFObjectReference, const PDFStructureItem*> mapping;
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PDFStructureTreeReferenceCollector referenceCollector(&mapping);
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m_tree->accept(&referenceCollector);
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PDFFontCache fontCache(DEFAULT_FONT_CACHE_LIMIT, DEFAULT_REALIZED_FONT_CACHE_LIMIT);
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QMutex mutex;
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PDFCMSGeneric cms;
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PDFMeshQualitySettings mqs;
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PDFOptionalContentActivity oca(m_document, OCUsage::Export, nullptr);
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pdf::PDFModifiedDocument md(const_cast<PDFDocument*>(m_document), &oca);
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fontCache.setDocument(md);
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fontCache.setCacheShrinkEnabled(nullptr, false);
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auto generateTextLayout = [&, this](PDFInteger pageIndex)
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{
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const PDFCatalog* catalog = m_document->getCatalog();
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if (!catalog->getPage(pageIndex))
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{
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// Invalid page index
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return;
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}
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const PDFPage* page = catalog->getPage(pageIndex);
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Q_ASSERT(page);
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PDFStructureTreeTextContentProcessor processor(PDFRenderer::IgnoreOptionalContent, page, m_document, &fontCache, &cms, &oca, QMatrix(), mqs, m_tree, &mapping, m_options);
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QList<PDFRenderError> errors = processor.processContents();
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QMutexLocker lock(&mutex);
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m_textSequences[pageIndex] = qMove(processor.takeSequence());
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m_unmatchedText << qMove(processor.takeUnmatchedTexts());
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m_errors.append(qMove(errors));
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};
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PDFExecutionPolicy::execute(PDFExecutionPolicy::Scope::Page, pageIndices.begin(), pageIndices.end(), generateTextLayout);
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fontCache.setCacheShrinkEnabled(nullptr, true);
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if (m_options.testFlag(CreateTreeMapping))
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{
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for (const auto& sequence : m_textSequences)
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{
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std::stack<const PDFStructureItem*> stack;
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for (const PDFStructureTreeTextItem& sequenceItem : sequence.second)
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{
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switch (sequenceItem.type)
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{
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case PDFStructureTreeTextItem::Type::StartTag:
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stack.push(sequenceItem.item);
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break;
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case PDFStructureTreeTextItem::Type::EndTag:
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stack.pop();
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break;
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case PDFStructureTreeTextItem::Type::Text:
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if (!stack.empty())
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{
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m_textForItems[stack.top()] << sequenceItem.text;
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}
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break;
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}
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}
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}
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}
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}
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const PDFStructureTreeTextSequence& PDFStructureTreeTextExtractor::getTextSequence(PDFInteger pageIndex) const
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{
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auto it = m_textSequences.find(pageIndex);
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if (it != m_textSequences.cend())
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{
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return it->second;
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}
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static PDFStructureTreeTextSequence dummy;
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return dummy;
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}
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const QStringList& PDFStructureTreeTextExtractor::getText(const PDFStructureItem* item) const
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{
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auto it = m_textForItems.find(item);
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if (it != m_textForItems.cend())
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{
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return it->second;
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}
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static const QStringList dummy;
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return dummy;
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}
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class PDFStructureTreeTextFlowCollector : public PDFStructureTreeAbstractVisitor
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{
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public:
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explicit PDFStructureTreeTextFlowCollector(PDFDocumentTextFlow::Items* items, const PDFStructureTreeTextExtractor* extractor) :
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m_items(items),
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m_extractor(extractor)
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{
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}
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virtual void visitStructureTree(const PDFStructureTree* structureTree) override;
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virtual void visitStructureElement(const PDFStructureElement* structureElement) override;
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virtual void visitStructureMarkedContentReference(const PDFStructureMarkedContentReference* structureMarkedContentReference) override;
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virtual void visitStructureObjectReference(const PDFStructureObjectReference* structureObjectReference) override;
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private:
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void markHasContent();
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PDFDocumentTextFlow::Items* m_items;
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const PDFStructureTreeTextExtractor* m_extractor;
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std::vector<bool> m_hasContentStack;
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};
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void PDFStructureTreeTextFlowCollector::visitStructureTree(const PDFStructureTree* structureTree)
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{
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m_items->push_back(PDFDocumentTextFlow::Item{PDFDocumentTextFlow::StructureItemStart, -1, QString()});
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acceptChildren(structureTree);
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m_items->push_back(PDFDocumentTextFlow::Item{PDFDocumentTextFlow::StructureItemEnd, -1, QString()});
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}
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void PDFStructureTreeTextFlowCollector::markHasContent()
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{
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for (size_t i = 0; i < m_hasContentStack.size(); ++i)
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{
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m_hasContentStack[i] = true;
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}
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}
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void PDFStructureTreeTextFlowCollector::visitStructureElement(const PDFStructureElement* structureElement)
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{
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size_t index = m_items->size();
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m_items->push_back(PDFDocumentTextFlow::Item{PDFDocumentTextFlow::StructureItemStart, -1, QString()});
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// Mark stack so we can delete unused items
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m_hasContentStack.push_back(false);
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QString title = structureElement->getText(PDFStructureElement::Title);
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QString language = structureElement->getText(PDFStructureElement::Language);
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QString alternativeDescription = structureElement->getText(PDFStructureElement::AlternativeDescription);
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QString expandedForm = structureElement->getText(PDFStructureElement::ExpandedForm);
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QString actualText = structureElement->getText(PDFStructureElement::ActualText);
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QString phoneme = structureElement->getText(PDFStructureElement::Phoneme);
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if (!title.isEmpty())
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{
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markHasContent();
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m_items->push_back(PDFDocumentTextFlow::Item{PDFDocumentTextFlow::StructureTitle, -1, });
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}
|
|
|
|
if (!language.isEmpty())
|
|
{
|
|
markHasContent();
|
|
m_items->push_back(PDFDocumentTextFlow::Item{PDFDocumentTextFlow::StructureLanguage, -1, language });
|
|
}
|
|
|
|
if (!alternativeDescription.isEmpty())
|
|
{
|
|
markHasContent();
|
|
m_items->push_back(PDFDocumentTextFlow::Item{PDFDocumentTextFlow::StructureAlternativeDescription, -1, alternativeDescription });
|
|
}
|
|
|
|
if (!expandedForm.isEmpty())
|
|
{
|
|
markHasContent();
|
|
m_items->push_back(PDFDocumentTextFlow::Item{PDFDocumentTextFlow::StructureExpandedForm, -1, expandedForm });
|
|
}
|
|
|
|
if (!actualText.isEmpty())
|
|
{
|
|
markHasContent();
|
|
m_items->push_back(PDFDocumentTextFlow::Item{PDFDocumentTextFlow::StructureActualText, -1, actualText });
|
|
}
|
|
|
|
if (!phoneme.isEmpty())
|
|
{
|
|
markHasContent();
|
|
m_items->push_back(PDFDocumentTextFlow::Item{PDFDocumentTextFlow::StructurePhoneme, -1, phoneme });
|
|
}
|
|
|
|
for (const QString& string : m_extractor->getText(structureElement))
|
|
{
|
|
markHasContent();
|
|
m_items->push_back(PDFDocumentTextFlow::Item{PDFDocumentTextFlow::Text, -1, string});
|
|
}
|
|
|
|
acceptChildren(structureElement);
|
|
|
|
const bool hasContent = m_hasContentStack.back();
|
|
m_hasContentStack.pop_back();
|
|
|
|
m_items->push_back(PDFDocumentTextFlow::Item{PDFDocumentTextFlow::StructureItemEnd, -1, QString()});
|
|
|
|
if (!hasContent)
|
|
{
|
|
// Delete unused content
|
|
m_items->erase(std::next(m_items->begin(), index), m_items->end());
|
|
}
|
|
}
|
|
|
|
void PDFStructureTreeTextFlowCollector::visitStructureMarkedContentReference(const PDFStructureMarkedContentReference* structureMarkedContentReference)
|
|
{
|
|
acceptChildren(structureMarkedContentReference);
|
|
}
|
|
|
|
void PDFStructureTreeTextFlowCollector::visitStructureObjectReference(const PDFStructureObjectReference* structureObjectReference)
|
|
{
|
|
acceptChildren(structureObjectReference);
|
|
}
|
|
|
|
PDFDocumentTextFlow PDFDocumentTextFlowFactory::create(const PDFDocument* document, const std::vector<PDFInteger>& pageIndices, Algorithm algorithm)
|
|
{
|
|
PDFDocumentTextFlow result;
|
|
PDFStructureTree structureTree;
|
|
|
|
const PDFCatalog* catalog = document->getCatalog();
|
|
if (algorithm != Algorithm::Layout)
|
|
{
|
|
structureTree = PDFStructureTree::parse(&document->getStorage(), catalog->getStructureTreeRoot());
|
|
}
|
|
|
|
if (algorithm == Algorithm::Auto)
|
|
{
|
|
// Determine algorithm
|
|
if (catalog->isLogicalStructureMarked() && structureTree.isValid())
|
|
{
|
|
algorithm = Algorithm::Structure;
|
|
}
|
|
else
|
|
{
|
|
algorithm = Algorithm::Layout;
|
|
}
|
|
}
|
|
|
|
Q_ASSERT(algorithm != Algorithm::Auto);
|
|
|
|
// Perform algorithm to retrieve document text
|
|
switch (algorithm)
|
|
{
|
|
case Algorithm::Layout:
|
|
{
|
|
PDFFontCache fontCache(DEFAULT_FONT_CACHE_LIMIT, DEFAULT_REALIZED_FONT_CACHE_LIMIT);
|
|
|
|
std::map<PDFInteger, PDFDocumentTextFlow::Items> items;
|
|
|
|
QMutex mutex;
|
|
PDFCMSGeneric cms;
|
|
PDFMeshQualitySettings mqs;
|
|
PDFOptionalContentActivity oca(document, OCUsage::Export, nullptr);
|
|
pdf::PDFModifiedDocument md(const_cast<PDFDocument*>(document), &oca);
|
|
fontCache.setDocument(md);
|
|
fontCache.setCacheShrinkEnabled(nullptr, false);
|
|
|
|
auto generateTextLayout = [this, &items, &mutex, &fontCache, &cms, &mqs, &oca, document, catalog](PDFInteger pageIndex)
|
|
{
|
|
if (!catalog->getPage(pageIndex))
|
|
{
|
|
// Invalid page index
|
|
return;
|
|
}
|
|
|
|
const PDFPage* page = catalog->getPage(pageIndex);
|
|
Q_ASSERT(page);
|
|
|
|
PDFTextLayoutGenerator generator(PDFRenderer::IgnoreOptionalContent, page, document, &fontCache, &cms, &oca, QMatrix(), mqs);
|
|
QList<PDFRenderError> errors = generator.processContents();
|
|
PDFTextLayout textLayout = generator.createTextLayout();
|
|
PDFTextFlows textFlows = PDFTextFlow::createTextFlows(textLayout, PDFTextFlow::FlowFlags(PDFTextFlow::SeparateBlocks) | PDFTextFlow::RemoveSoftHyphen, pageIndex);
|
|
|
|
PDFDocumentTextFlow::Items flowItems;
|
|
flowItems.emplace_back(PDFDocumentTextFlow::Item{ PDFDocumentTextFlow::PageStart, pageIndex, PDFTranslationContext::tr("Page %1").arg(pageIndex + 1) });
|
|
for (const PDFTextFlow& textFlow : textFlows)
|
|
{
|
|
flowItems.emplace_back(PDFDocumentTextFlow::Item{ PDFDocumentTextFlow::Text, pageIndex, textFlow.getText() });
|
|
}
|
|
flowItems.emplace_back(PDFDocumentTextFlow::Item{ PDFDocumentTextFlow::PageEnd, pageIndex, QString() });
|
|
|
|
QMutexLocker lock(&mutex);
|
|
items[pageIndex] = qMove(flowItems);
|
|
m_errors.append(qMove(errors));
|
|
};
|
|
|
|
PDFExecutionPolicy::execute(PDFExecutionPolicy::Scope::Page, pageIndices.begin(), pageIndices.end(), generateTextLayout);
|
|
|
|
fontCache.setCacheShrinkEnabled(nullptr, true);
|
|
|
|
PDFDocumentTextFlow::Items flowItems;
|
|
for (const auto& item : items)
|
|
{
|
|
flowItems.insert(flowItems.end(), std::make_move_iterator(item.second.begin()), std::make_move_iterator(item.second.end()));
|
|
}
|
|
|
|
result = PDFDocumentTextFlow(qMove(flowItems));
|
|
break;
|
|
}
|
|
|
|
case Algorithm::Structure:
|
|
{
|
|
if (!structureTree.isValid())
|
|
{
|
|
m_errors << PDFRenderError(RenderErrorType::Error, PDFTranslationContext::tr("Valid tagged document required."));
|
|
break;
|
|
}
|
|
|
|
PDFStructureTreeTextExtractor extractor(document, &structureTree, PDFStructureTreeTextExtractor::SkipArtifact | PDFStructureTreeTextExtractor::AdjustReversedText | PDFStructureTreeTextExtractor::CreateTreeMapping);
|
|
extractor.perform(pageIndices);
|
|
|
|
PDFDocumentTextFlow::Items flowItems;
|
|
PDFStructureTreeTextFlowCollector collector(&flowItems, &extractor);
|
|
structureTree.accept(&collector);
|
|
|
|
result = PDFDocumentTextFlow(qMove(flowItems));
|
|
m_errors.append(extractor.getErrors());
|
|
break;
|
|
}
|
|
|
|
case Algorithm::Content:
|
|
{
|
|
PDFStructureTreeTextExtractor extractor(document, &structureTree, PDFStructureTreeTextExtractor::None);
|
|
extractor.perform(pageIndices);
|
|
|
|
PDFDocumentTextFlow::Items flowItems;
|
|
for (PDFInteger pageIndex : pageIndices)
|
|
{
|
|
flowItems.emplace_back(PDFDocumentTextFlow::Item{ PDFDocumentTextFlow::PageStart, pageIndex, PDFTranslationContext::tr("Page %1").arg(pageIndex + 1) });
|
|
for (const PDFStructureTreeTextItem& sequenceItem : extractor.getTextSequence(pageIndex))
|
|
{
|
|
if (sequenceItem.type == PDFStructureTreeTextItem::Type::Text)
|
|
{
|
|
flowItems.emplace_back(PDFDocumentTextFlow::Item{ PDFDocumentTextFlow::Text, pageIndex, sequenceItem.text });
|
|
}
|
|
}
|
|
flowItems.emplace_back(PDFDocumentTextFlow::Item{ PDFDocumentTextFlow::PageEnd, pageIndex, QString() });
|
|
}
|
|
|
|
result = PDFDocumentTextFlow(qMove(flowItems));
|
|
m_errors.append(extractor.getErrors());
|
|
break;
|
|
}
|
|
|
|
default:
|
|
Q_ASSERT(false);
|
|
break;
|
|
}
|
|
|
|
return result;
|
|
}
|
|
|
|
} // namespace pdf
|