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[wxWidgets.git] / src / common / unichar.cpp

diff --git a/src/common/unichar.cpp b/src/common/unichar.cpp
index fa9890365fd572a55ffde76ae1b7647271ad1cbe..163d388744634e4fd5d9645981f7a193803ee334 100644 (file)
--- a/src/common/unichar.cpp
+++ b/src/common/unichar.cpp
@@ -21,10 +21,11 @@
 
 #ifndef WX_PRECOMP
     #include "wx/strconv.h"  // wxConvLibc
+    #include "wx/log.h"
 #endif
 
 #include "wx/unichar.h"
-#include "wx/stringops.h"
+#include "wx/string.h"
 
 // ===========================================================================
 // implementation
@@ -35,38 +36,40 @@
 // ---------------------------------------------------------------------------
 
 /* static */
-wxUniChar::value_type wxUniChar::From8bit(char c)
+wxUniChar::value_type wxUniChar::FromHi8bit(char c)
 {
-    // all supported charsets have the first 128 characters same as ASCII:
-    if ( (unsigned char)c < 0x80 )
-        return c;
-
 #if wxUSE_UTF8_LOCALE_ONLY
-    wxFAIL_MSG( _T("invalid UTF-8 character") );
+    wxFAIL_MSG( "invalid UTF-8 character" );
+    wxUnusedVar(c);
+
     return wxT('?'); // FIXME-UTF8: what to use as failure character?
 #else
     wchar_t buf[2];
     if ( wxConvLibc.ToWChar(buf, 2, &c, 1) != 2 )
+    {
+        wxFAIL_MSG( "invalid multibyte character" );
         return wxT('?'); // FIXME-UTF8: what to use as failure character?
+    }
     return buf[0];
 #endif
 }
 
 /* static */
-char wxUniChar::To8bit(wxUniChar::value_type c)
+char wxUniChar::ToHi8bit(wxUniChar::value_type c)
 {
-    // all supported charsets have the first 128 characters same as ASCII:
-    if ( c < 0x80 )
-        return c;
-
 #if wxUSE_UTF8_LOCALE_ONLY
-    wxFAIL_MSG( _T("character cannot be converted to single UTF-8 byte") );
+    wxFAIL_MSG( "character cannot be converted to single UTF-8 byte" );
+    wxUnusedVar(c);
+
     return '?'; // FIXME-UTF8: what to use as failure character?
 #else
     wchar_t in = c;
     char buf[2];
     if ( wxConvLibc.FromWChar(buf, 2, &in, 1) != 2 )
+    {
+        wxFAIL_MSG( "character cannot be converted to single byte" );
         return '?'; // FIXME-UTF8: what to use as failure character?
+    }
     return buf[0];
 #endif
 }
@@ -90,18 +93,81 @@ wxUniCharRef& wxUniCharRef::operator=(const wxUniChar& c)
 
     if ( lenNew == lenOld )
     {
+        // this is the simpler case: if the new value's UTF-8 code has the
+        // same length, we can just replace it:
+
         iterator pos(m_pos);
         for ( size_t i = 0; i < lenNew; ++i, ++pos )
             *pos = utf[i];
     }
-    else
+    else // length of character encoding in UTF-8 changed
     {
-        size_t idx = m_pos - m_str.begin();
-
-        m_str.replace(m_pos, m_pos + lenOld, utf, lenNew);
-
-        // this is needed to keep m_pos valid:
-        m_pos = m_str.begin() + idx;
+        // the worse case is when the new value has either longer or shorter
+        // code -- in that case, we have to use wxStringImpl::replace() and
+        // this invalidates all iterators, so we have to update them too:
+
+        wxStringImpl& strimpl = m_str.m_impl;
+
+        int iterDiff = lenNew - lenOld;
+        size_t posIdx = m_pos - strimpl.begin();
+
+        // compute positions of outstanding iterators for this string after the
+        // replacement is done (there is only a small number of iterators at
+        // any time, so we use an array on the stack to avoid unneeded
+        // allocation):
+        static const size_t STATIC_SIZE = 32;
+        size_t indexes_a[STATIC_SIZE];
+        size_t *indexes = indexes_a;
+        size_t iterNum = 0;
+        wxStringIteratorNode *it;
+        for ( it = m_str.m_iterators.ptr; it; it = it->m_next, ++iterNum )
+        {
+            wxASSERT( it->m_iter || it->m_citer );
+
+            if ( iterNum == STATIC_SIZE )
+            {
+                wxLogTrace( _T("utf8"), _T("unexpectedly many iterators") );
+
+                size_t total = iterNum + 1;
+                for ( wxStringIteratorNode *it2 = it; it2; it2 = it2->m_next )
+                    total++;
+                indexes = new size_t[total];
+                memcpy(indexes, indexes_a, sizeof(size_t) * STATIC_SIZE);
+            }
+
+            size_t idx = it->m_iter
+                         ? (*it->m_iter - strimpl.begin())
+                         : (*it->m_citer - strimpl.begin());
+
+            if ( idx > posIdx )
+                idx += iterDiff;
+
+            indexes[iterNum] = idx;
+        }
+
+        // update the string:
+        strimpl.replace(m_pos, m_pos + lenOld, utf, lenNew);
+
+#if wxUSE_STRING_POS_CACHE
+        m_str.InvalidateCache();
+#endif // wxUSE_STRING_POS_CACHE
+
+        // finally, set the iterators to valid values again (note that this
+        // updates m_pos as well):
+        size_t i;
+        for ( i = 0, it = m_str.m_iterators.ptr; it; it = it->m_next, ++i )
+        {
+            wxASSERT( i < iterNum );
+            wxASSERT( it->m_iter || it->m_citer );
+
+            if ( it->m_iter )
+                *it->m_iter = strimpl.begin() + indexes[i];
+            else // it->m_citer
+                *it->m_citer = strimpl.begin() + indexes[i];
+        }
+
+        if ( indexes != indexes_a )
+            delete[] indexes;
     }
 
     return *this;