| 1 | /* |
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| 2 | SPDX-FileCopyrightText: 2016 Volker Krause <vkrause@kde.org> |
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| 3 | |
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| 4 | SPDX-License-Identifier: MIT |
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| 5 | */ |
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| 6 | |
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| 7 | #ifndef KSYNTAXHIGHLIGHTING_QSYNTAXHIGHLIGHTER_H |
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| 8 | #define KSYNTAXHIGHLIGHTING_QSYNTAXHIGHLIGHTER_H |
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| 9 | |
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| 10 | #include "ksyntaxhighlighting_export.h" |
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| 11 | |
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| 12 | #include "abstracthighlighter.h" |
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| 13 | |
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| 14 | #include <QSyntaxHighlighter> |
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| 15 | |
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| 16 | namespace KSyntaxHighlighting |
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| 17 | { |
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| 18 | class SyntaxHighlighterPrivate; |
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| 19 | |
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| 20 | /** A QSyntaxHighlighter implementation for use with QTextDocument. |
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| 21 | * This supports partial re-highlighting during editing and |
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| 22 | * tracks syntax-based code folding regions. |
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| 23 | * |
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| 24 | * @since 5.28 |
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| 25 | */ |
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| 26 | class KSYNTAXHIGHLIGHTING_EXPORT SyntaxHighlighter : public QSyntaxHighlighter, public AbstractHighlighter |
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| 27 | { |
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| 28 | Q_OBJECT |
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| 29 | public: |
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| 30 | explicit SyntaxHighlighter(QObject *parent = nullptr); |
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| 31 | explicit SyntaxHighlighter(QTextDocument *document); |
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| 32 | ~SyntaxHighlighter() override; |
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| 33 | |
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| 34 | void setDefinition(const Definition &def) override; |
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| 35 | |
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| 36 | /** Returns whether there is a folding region beginning at @p startBlock. |
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| 37 | * This only considers syntax-based folding regions, |
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| 38 | * not indention-based ones as e.g. found in Python. |
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| 39 | * |
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| 40 | * @see findFoldingRegionEnd |
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| 41 | */ |
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| 42 | bool startsFoldingRegion(const QTextBlock &startBlock) const; |
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| 43 | |
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| 44 | /** Finds the end of the folding region starting at @p startBlock. |
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| 45 | * If multiple folding regions begin at @p startBlock, the end of |
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| 46 | * the last/innermost one is returned. |
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| 47 | * This returns an invalid block if no folding region end is found, |
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| 48 | * which typically indicates an unterminated region and thus folding |
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| 49 | * until the document end. |
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| 50 | * This method performs a sequential search starting at @p startBlock |
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| 51 | * for the matching folding region end, which is a potentially expensive |
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| 52 | * operation. |
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| 53 | * |
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| 54 | * @see startsFoldingRegion |
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| 55 | */ |
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| 56 | QTextBlock findFoldingRegionEnd(const QTextBlock &startBlock) const; |
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| 57 | |
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| 58 | protected: |
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| 59 | void highlightBlock(const QString &text) override; |
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| 60 | void applyFormat(int offset, int length, const Format &format) override; |
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| 61 | void applyFolding(int offset, int length, FoldingRegion region) override; |
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| 62 | |
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| 63 | private: |
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| 64 | Q_DECLARE_PRIVATE_D(AbstractHighlighter::d_ptr, SyntaxHighlighter) |
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| 65 | }; |
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| 66 | } |
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| 67 | |
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| 68 | #endif // KSYNTAXHIGHLIGHTING_QSYNTAXHIGHLIGHTER_H |
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| 69 | |
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