textbuffer.h

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// edbee - Copyright (c) 2012-2025 by Rick Blommers and contributors
// SPDX-License-Identifier: MIT
 
#pragma once
 
#include "edbee/exports.h"
 
#include <QObject>
#include <QVector>
#include <QSharedData>
#include <QExplicitlySharedDataPointer>
 
namespace edbee {
 
class TextBuffer;
class TextBufferChange;
class TextRange;
class TextLineData;
class LineOffsetVector;
 
 
class EDBEE_EXPORT TextBufferChangeData : public QSharedData
{
public:
    TextBufferChangeData( TextBuffer* buffer, int off, int len, const QChar* text, int textlen );
    TextBufferChangeData( LineOffsetVector* lineOffsets, int off, int len, const QChar* text, int textlen );
 
    // text information
    int offset_;             
    int length_;             
    const QChar* newText_;   
    int newTextLength_;      
 
    // line informationm
    int line_;                    
    int lineCount_;               
    QVector<int> newLineOffsets_; 
 
};
class EDBEE_EXPORT TextBufferChangeData : public QSharedData {…};
 

class EDBEE_EXPORT TextBufferChange {
public:
    TextBufferChange();
    TextBufferChange( TextBuffer* buffer, int off, int len, const QChar* text, int textlen );
    TextBufferChange( LineOffsetVector* lineOffsets, int off, int len, const QChar* text, int textlen );
    TextBufferChange( const TextBufferChange& other );
 
    int offset() const { return d_->offset_; }
    int length() const { return d_->length_; }
    const QChar* newText() const  { return d_->newText_; }
    int newTextLength() const { return d_->newTextLength_; }
    int line() const { return d_->line_; }
    int lineCount() const { return d_->lineCount_; }
    inline int newLineCount() const { return d_->newLineOffsets_.size(); }
    const QVector<int>& newLineOffsets() const { return d_->newLineOffsets_; }
 
 
private:
    QExplicitlySharedDataPointer<TextBufferChangeData> d_;
};
class EDBEE_EXPORT TextBufferChange {…};

class EDBEE_EXPORT TextBuffer : public QObject
{
Q_OBJECT
 
public:
    TextBuffer( QObject* parent = 0);
 
// Minimal abstract interface to implement

    virtual int length() const = 0;

    virtual QChar charAt( int offset ) const = 0;

    virtual QString textPart( int offset, int length ) const = 0;

    virtual void replaceText( int offset, int length, const QChar* buffer, int bufferLength ) = 0;

    virtual int lineCount() = 0; // { return lineOffsets().length(); }
    virtual int lineFromOffset(int offset ) = 0;
    virtual int offsetFromLine( int line ) = 0;
 
// raw loading methods

    virtual void rawAppendBegin() = 0;

    virtual void rawAppend( QChar c ) = 0;

    virtual void rawAppend( const QChar* data, int dataLength ) = 0;

    virtual void rawAppendEnd() = 0;

    virtual QChar* rawDataPointer() = 0;
 
 
// easy functions

    virtual void replaceText( int offset, int length, const QString& text );
 
    QString text();
    void setText( const QString& text );
    virtual int columnFromOffsetAndLine( int offset, int line=-1 );
    virtual void appendText( const QString& text );
    virtual int offsetFromLineAndColumn( int line, int col );
    virtual QString line( int line);
    virtual QString lineWithoutNewline( int line );
 
    virtual int lineLength(int line);
    virtual int lineLengthWithoutNewline(int line);
    virtual void replaceText( const TextRange& range, const QString& text  );
 
    virtual int findCharPos( int offset, int direction, const QString& chars, bool equals );
    virtual int findCharPosWithinRange( int offset, int direction, const QString& chars, bool equals, int beginRange, int endRange );
    virtual int findCharPosOrClamp( int offset, int direction, const QString& chars, bool equals );
    virtual int findCharPosWithinRangeOrClamp( int offset, int direction, const QString& chars, bool equals, int beginRange, int endRange );
 
    virtual QString lineOffsetsAsString();
 
 signals:
 
    void textAboutToBeChanged( edbee::TextBufferChange change );
    void textChanged( edbee::TextBufferChange change, QString oldText = QString() );
 
};
class EDBEE_EXPORT TextBuffer : public QObject {…};
 
} // edbee
 
// needs to be OUTSIDE the namespace!!
Q_DECLARE_METATYPE(edbee::TextBufferChange)