Add support for unicode surrogate characters to Kate/KWrite

Signed-off-by: Michele Calgaro <michele.calgaro@yahoo.it>
(cherry picked from commit 1aa4271c122eb4dbbe4568418923ec04123c7474)

1 files changed, 33 insertions, 8 deletions

diff --git a/kate/part/katedocument.cpp b/kate/part/katedocument.cpp
index a125c2c85..367f70d64 100644
--- a/kate/part/katedocument.cpp
+++ b/kate/part/katedocument.cpp
@@ -2411,7 +2411,7 @@ bool KateDocument::openFile(TDEIO::Job * job)
 
   // read dir config (if possible and wanted)
   if (!m_reloading)
-	readDirConfig ();
+    readDirConfig ();
 
   // do we have success ?
   bool success = m_buffer->openFile (m_file);
@@ -3135,15 +3135,27 @@ void KateDocument::backspace( KateView *view, const KateTextCursor& c )
   if ((col == 0) && (line == 0))
     return;
 
+  KateTextLine::Ptr tl = m_buffer->plainLine(line);
+  if (!tl)
+  {
+    return;
+  }
+   
+  // Make sure to handle surrogate pairs correctly
+  uint fromCol = col - 1;
+  TQChar prevChar = tl->getChar(col - 1);
+  if (prevChar.isLowSurrogate() && tl->getChar(col - 2).isHighSurrogate())
+  {
+    fromCol = col - 2;
+    prevChar = tl->getChar(col - 2);
+  }
+
   int complement = 0;
   if (col > 0)
   {
     if (config()->configFlags() & KateDocument::cfAutoBrackets)
     {
       // if inside empty (), {}, [], '', "" delete both
-      KateTextLine::Ptr tl = m_buffer->plainLine(line);
-      if(!tl) return;
-      TQChar prevChar = tl->getChar(col-1);
       TQChar nextChar = tl->getChar(col);
 
       if ( (prevChar == '"' && nextChar == '"') ||
@@ -3158,8 +3170,7 @@ void KateDocument::backspace( KateView *view, const KateTextCursor& c )
     if (!(config()->configFlags() & KateDocument::cfBackspaceIndents))
     {
       // ordinary backspace
-      //c.cursor.col--;
-      removeText(line, col-1, line, col+complement);
+      removeText(line, fromCol, line, col+complement);
     }
     else
     {
@@ -3215,9 +3226,23 @@ void KateDocument::del( KateView *view, const KateTextCursor& c )
     return;
   }
 
-  if( c.col() < (int) m_buffer->plainLine(c.line())->length())
+  KateTextLine::Ptr tl = m_buffer->plainLine(c.line());
+  if (!tl)
   {
-    removeText(c.line(), c.col(), c.line(), c.col()+1);
+    return;
+  }
+  uint lineLen = tl->length();
+  uint col = (uint)c.col();
+  if (col < lineLen)
+  {
+    // Make sure to handle surrogate pairs correctly
+    uint toCol = col + 1;
+    if (tl->getChar(col).isHighSurrogate() && tl->getChar(col + 1).isLowSurrogate())
+    {
+      toCol = col + 2;
+    }
+
+    removeText(c.line(), col, c.line(), toCol);
   }
   else if ( (uint)c.line() < lastLine() )
   {