X-Git-Url: https://git.saurik.com/wxWidgets.git/blobdiff_plain/111d99489d509bc96819877b88596474f3253859..39c0d6d6b6682b1847881d1e2662a4ccdec83ec8:/src/common/unichar.cpp

diff --git a/src/common/unichar.cpp b/src/common/unichar.cpp
index fa9890365f..de95fcd001 100644
--- a/src/common/unichar.cpp
+++ b/src/common/unichar.cpp
@@ -3,7 +3,6 @@
 // Purpose:     wxUniChar and wxUniCharRef classes
 // Author:      Vaclav Slavik
 // Created:     2007-03-19
-// RCS-ID:      $Id$
 // Copyright:   (c) 2007 REA Elektronik GmbH
 // Licence:     wxWindows licence
 ///////////////////////////////////////////////////////////////////////////////
@@ -21,10 +20,11 @@
 
 #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
@@ -35,42 +35,53 @@
 // ---------------------------------------------------------------------------
 
 /* 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 )
+    char cbuf[2];
+    cbuf[0] = c;
+    cbuf[1] = '\0';
+    wchar_t wbuf[2];
+    if ( wxConvLibc.ToWChar(wbuf, 2, cbuf, 2) != 2 )
+    {
+        wxFAIL_MSG( "invalid multibyte character" );
         return wxT('?'); // FIXME-UTF8: what to use as failure character?
-    return buf[0];
+    }
+    return wbuf[0];
 #endif
 }
 
 /* static */
-char wxUniChar::To8bit(wxUniChar::value_type c)
+char wxUniChar::ToHi8bit(wxUniChar::value_type v)
 {
-    // all supported charsets have the first 128 characters same as ASCII:
-    if ( c < 0x80 )
-        return c;
+    char c;
+    if ( !GetAsHi8bit(v, &c) )
+    {
+        wxFAIL_MSG( "character cannot be converted to single byte" );
+        c = '?'; // FIXME-UTF8: what to use as failure character?
+    }
 
-#if wxUSE_UTF8_LOCALE_ONLY
-    wxFAIL_MSG( _T("character cannot be converted to single UTF-8 byte") );
-    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 )
-        return '?'; // FIXME-UTF8: what to use as failure character?
-    return buf[0];
-#endif
+    return c;
 }
 
+/* static */
+bool wxUniChar::GetAsHi8bit(value_type v, char *c)
+{
+    wchar_t wbuf[2];
+    wbuf[0] = v;
+    wbuf[1] = L'\0';
+    char cbuf[2];
+    if ( wxConvLibc.FromWChar(cbuf, 2, wbuf, 2) != 2 )
+        return false;
+
+    *c = cbuf[0];
+    return true;
+}
 
 // ---------------------------------------------------------------------------
 // wxUniCharRef
@@ -90,18 +101,81 @@ 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( wxT("utf8"), wxT("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;