Working on TextBuilder & Text.

Seriously thinking about changing Text to just use full codepoints. It
would be much less work, more reliable and predictable, easier to use,
but would use twice the memory.

1 files changed, 281 insertions, 0 deletions

diff --git a/src/unstable/textbuilder.cpp b/src/unstable/textbuilder.cpp
index 73271f8..af4dbac 100644
--- a/src/unstable/textbuilder.cpp
+++ b/src/unstable/textbuilder.cpp
@@ -5,4 +5,285 @@
  * terms of the license contained in the file LICENSE.
  */
 
+#include "bu/textbuilder.h"
+
+#include "bu/exceptionbase.h"
+#include "bu/text.h"
+
+#define PAGE_SIZE       16
+
+Bu::TextBuilderCore::Chunk::Chunk( const CodePoint *pSrc, int32_t iLength ) :
+    iLength( iLength ),
+    pData( 0 ),
+    pNext( 0 )
+{
+    if( iLength < PAGE_SIZE )
+    {
+        pData = new CodePoint[PAGE_SIZE];
+    }
+    else
+    {
+        pData = new CodePoint[iLength];
+    }
+    memcpy( pData, pSrc, iLength*sizeof(CodePoint) );
+}
+
+Bu::TextBuilderCore::Chunk::~Chunk()
+{
+    delete[] pData;
+    pData = 0;
+    pNext = 0;
+}
+
+void Bu::TextBuilderCore::Chunk::append( const Bu::CodePoint *&pSrc,
+        int32_t &iLength )
+{
+    if( this->iLength >= PAGE_SIZE )
+    {
+        // This chink is full, just return.
+        return;
+    }
+    int32_t iCopy = PAGE_SIZE-this->iLength;
+    if( iCopy > iLength )
+    {
+        iCopy = iLength;
+    }
+    memcpy( pData+this->iLength, pSrc, iCopy*sizeof(Bu::CodePoint) );
+    this->iLength += iCopy;
+    pSrc += iCopy;
+    iLength -= iCopy;
+}
+
+Bu::TextBuilderCore::Chunk *Bu::TextBuilderCore::Chunk::split( int32_t iIndex )
+{
+    if( iIndex == 0 )
+        return NULL;
+
+    if( iIndex >= iLength )
+        return NULL;
+
+    Chunk *pNew = new Chunk( pData+iIndex, iLength-iIndex );
+    iLength -= iIndex;
+    pNew->pNext = pNext;
+    pNext = pNew;
+
+    return pNew;
+}
+
+
+//////
+// TextBuilderCore
+//
+Bu::TextBuilderCore::TextBuilderCore() :
+    pFirst( 0 ),
+    pLast( 0 ),
+    iLength( 0 )
+{
+}
+
+Bu::TextBuilderCore::TextBuilderCore( const TextBuilderCore &rSrc ) :
+    pFirst( 0 ),
+    pLast( 0 ),
+    iLength( rSrc.iLength )
+{
+    throw Bu::ExceptionBase("Not yet implemented.");
+}
+
+Bu::TextBuilderCore::~TextBuilderCore()
+{
+    clear();
+}
+
+void Bu::TextBuilderCore::clear()
+{
+    Chunk *pCur = pFirst;
+    while( pCur )
+    {
+        Chunk *pNext = pCur->pNext;
+        delete pCur;
+        pCur = pNext;
+    }
+    pFirst = pLast = 0;
+    iLength = 0;
+}
+
+void Bu::TextBuilderCore::append( const CodePoint *pSrc, int32_t iLength )
+{
+    this->iLength += iLength;
+    if( pFirst == 0 )
+    {
+        // Nothing in the list, just add a chunk.
+        pFirst = pLast = new Chunk( pSrc, iLength );
+        return;
+    }
+    else if( pLast->iLength < PAGE_SIZE )
+    {
+        // Append to the last chunk first, this will modify pSrc & iLength.
+        pLast->append( pSrc, iLength );
+    }
+
+    // If there's unused data at the end, append it now.
+    if( iLength > 0 )
+    {
+        pLast->pNext = new Chunk( pSrc, iLength );
+        pLast = pLast->pNext;
+    }
+}
+
+void Bu::TextBuilderCore::prepend( const CodePoint *pSrc, int32_t iLength )
+{
+    if( pFirst == 0 )
+    {
+        pFirst = pLast = new Chunk( pSrc, iLength );
+    }
+    else
+    {
+        Chunk *pNew = new Chunk( pSrc, iLength );
+        pNew->pNext = pFirst;
+        pFirst = pNew;
+    }
+    this->iLength += iLength;
+}
+
+void Bu::TextBuilderCore::insert( int32_t iBefore, const CodePoint *pSrc, int32_t iLength )
+{
+    if( iBefore <= 0 )
+    {
+        prepend( pSrc, iLength );
+        return;
+    }
+    if( iBefore >= this->iLength )
+    {
+        append( pSrc, iLength );
+        return;
+    }
+
+    Chunk *pCur = pFirst;
+    while( pCur )
+    {
+        if( iBefore == 0 )
+        {
+            // Insert between chunks, no splitting required.
+            Chunk *pNew = new Chunk( pSrc, iLength );
+            pNew->pNext = pCur->pNext;
+            pCur->pNext = pNew;
+            if( pLast == pCur )
+                pLast = pNew;
+        }
+        if( iBefore < pCur->iLength )
+        {
+            // This is the chunk we need to split.
+            Chunk *pNew = pCur->split( iBefore );
+            if( pLast == pCur )
+                pLast = pNew;
+            continue;
+        }
+        pCur = pCur->pNext;
+    }
+    this->iLength = iLength;
+}
+
+void Bu::TextBuilderCore::set( const CodePoint *pSrc, int32_t iLength )
+{
+    clear();
+    append( pSrc, iLength );
+}
+
+void Bu::TextBuilderCore::copyTo( void *pDestRaw, int32_t iLength )
+{
+    
+}
+
+Bu::CodePoint Bu::TextBuilderCore::getAt( int32_t iIndex ) const
+{
+    if( iIndex < 0 || iIndex >= iLength )
+        throw Bu::ExceptionBase("Requested index is out of range.");
+
+    Chunk *pCur = pFirst;
+    while( iIndex >= pCur->iLength )
+    {
+        iIndex -= pCur->iLength;
+        pCur = pCur->pNext;
+    }
+    return pCur->pData[iIndex];
+}
+
+/////
+// TextBuilder
+//
+
+Bu::TextBuilder::TextBuilder()
+{
+}
+
+Bu::TextBuilder::TextBuilder( const Text &rSrc )
+{
+}
+
+Bu::TextBuilder::TextBuilder( const TextBuilder &rSrc ) :
+    Bu::SharedCore<Bu::TextBuilder, Bu::TextBuilderCore>( rSrc )
+{
+}
+
+Bu::TextBuilder::~TextBuilder()
+{
+}
+
+void Bu::TextBuilder::set( const Text &rSrc )
+{
+    _hardCopy();
+    core->set( rSrc.getData(), rSrc.getSize() );
+}
+
+void Bu::TextBuilder::append( const Text &rSrc )
+{
+    _hardCopy();
+}
+
+void Bu::TextBuilder::append( const CodePoint *pSrc, int32_t iLength )
+{
+    _hardCopy();
+}
+
+void Bu::TextBuilder::prepend( const Text &rSrc )
+{
+    _hardCopy();
+}
+
+void Bu::TextBuilder::insert( const Text &rSrc )
+{
+    _hardCopy();
+}
+
+void Bu::TextBuilder::clear()
+{
+    _hardCopy();
+}
+
+int32_t Bu::TextBuilder::getSize() const
+{
+    return core->iLength;
+}
+
+Bu::Text Bu::TextBuilder::getText() const
+{
+    return Text( *this );
+}
+
+Bu::CodePoint Bu::TextBuilder::operator[]( int32_t iIndex ) const
+{
+    return core->getAt( iIndex );
+}
+
+Bu::TextBuilder &Bu::TextBuilder::operator=( const Text &rSrc )
+{
+    set( rSrc );
+    return *this;
+}
+
+Bu::TextBuilder &Bu::TextBuilder::operator==( const Text &rSrc )
+{
+    set( pSrc );
+    return *this;
+}