bool wxFFile::Write(const wxString& s, const wxMBConv& conv)
{
// Writing nothing always succeeds -- and simplifies the check for
// conversion failure below.
if ( s.empty() )
return true;
const wxWX2MBbuf buf = s.mb_str(conv);
#if wxUSE_UNICODE
const size_t size = buf.length();
if ( !size )
{
// This means that the conversion failed as the original string wasn't
// empty (we explicitly checked for this above) and in this case we
// must fail too to indicate that we can't save the data.
return false;
}
#else
const size_t size = s.length();
#endif
return Write(buf, size) == size;
}
bool wxFile::Write(const wxString& s, const wxMBConv& conv)
{
const wxWX2MBbuf buf = s.mb_str(conv);
if ( !buf )
return false;
#if wxUSE_UNICODE
const size_t size = buf.length();
#else
const size_t size = s.length();
#endif
return Write(buf, size) == size;
}
int wxRegExImpl::Replace(wxString *text,
const wxString& replacement,
size_t maxMatches) const
{
wxCHECK_MSG( text, wxNOT_FOUND, wxT("NULL text in wxRegEx::Replace") );
wxCHECK_MSG( IsValid(), wxNOT_FOUND, wxT("must successfully Compile() first") );
// the input string
#ifndef WXREGEX_CONVERT_TO_MB
const wxChar *textstr = text->c_str();
size_t textlen = text->length();
#else
const wxWX2MBbuf textstr = WXREGEX_CHAR(*text);
if (!textstr)
{
wxLogError(_("Failed to find match for regular expression: %s"),
GetErrorMsg(0, true).c_str());
return 0;
}
size_t textlen = strlen(textstr);
text->clear();
#endif
// the replacement text
wxString textNew;
// the result, allow 25% extra
wxString result;
result.reserve(5 * textlen / 4);
// attempt at optimization: don't iterate over the string if it doesn't
// contain back references at all
bool mayHaveBackrefs =
replacement.find_first_of(wxT("\\&")) != wxString::npos;
if ( !mayHaveBackrefs )
{
textNew = replacement;
}
// the position where we start looking for the match
size_t matchStart = 0;
// number of replacement made: we won't make more than maxMatches of them
// (unless maxMatches is 0 which doesn't limit the number of replacements)
size_t countRepl = 0;
// note that "^" shouldn't match after the first call to Matches() so we
// use wxRE_NOTBOL to prevent it from happening
while ( (!maxMatches || countRepl < maxMatches) &&
Matches(
#ifndef WXREGEX_CONVERT_TO_MB
textstr + matchStart,
#else
textstr.data() + matchStart,
#endif
countRepl ? wxRE_NOTBOL : 0
WXREGEX_IF_NEED_LEN(textlen - matchStart)) )
{
// the string possibly contains back references: we need to calculate
// the replacement text anew after each match
if ( mayHaveBackrefs )
{
mayHaveBackrefs = false;
textNew.clear();
textNew.reserve(replacement.length());
for ( const wxChar *p = replacement.c_str(); *p; p++ )
{
size_t index = (size_t)-1;
if ( *p == wxT('\\') )
{
if ( wxIsdigit(*++p) )
{
// back reference
wxChar *end;
index = (size_t)wxStrtoul(p, &end, 10);
p = end - 1; // -1 to compensate for p++ in the loop
}
//else: backslash used as escape character
}
else if ( *p == wxT('&') )
{
// treat this as "\0" for compatbility with ed and such
index = 0;
}
// do we have a back reference?
if ( index != (size_t)-1 )
{
// yes, get its text
size_t start, len;
if ( !GetMatch(&start, &len, index) )
{
wxFAIL_MSG( wxT("invalid back reference") );
// just eat it...
}
else
{
textNew += wxString(
#ifndef WXREGEX_CONVERT_TO_MB
textstr
#else
textstr.data()
#endif
+ matchStart + start,
*wxConvCurrent, len);
mayHaveBackrefs = true;
}
}
else // ordinary character
{
textNew += *p;
}
}
}
size_t start, len;
if ( !GetMatch(&start, &len) )
{
// we did have match as Matches() returned true above!
wxFAIL_MSG( wxT("internal logic error in wxRegEx::Replace") );
return wxNOT_FOUND;
}
// an insurance against implementations that don't grow exponentially
// to ensure building the result takes linear time
if (result.capacity() < result.length() + start + textNew.length())
result.reserve(2 * result.length());
#ifndef WXREGEX_CONVERT_TO_MB
result.append(*text, matchStart, start);
#else
result.append(wxString(textstr.data() + matchStart, *wxConvCurrent, start));
#endif
matchStart += start;
result.append(textNew);
countRepl++;
matchStart += len;
}
#ifndef WXREGEX_CONVERT_TO_MB
result.append(*text, matchStart, wxString::npos);
#else
result.append(wxString(textstr.data() + matchStart, *wxConvCurrent));
#endif
*text = result;
return countRepl;
}
