// Do nothing if the tabsize is 0.
if ( tabsize < 1 )
{
return;
}
// Get the current row, column.
int row = cursor.row;
int col = cursor.col;
const char* p = stamp;
assert( p );
while ( p < now )
{
// Treat p as unsigned, so we have a happy compiler.
const unsigned char* pU = (const unsigned char*)p;
// Code contributed by Fletcher Dunn: (modified by lee)
switch (*pU) {
case 0:
// We *should* never get here, but in case we do, don't
// advance past the terminating null character, ever
return;
case '\r':
// bump down to the next line
++row;
col = 0;
// Eat the character
++p;
// Check for \r\n sequence, and treat this as a single character
if (*p == '\n') {
++p;
}
break;
case '\n':
// bump down to the next line
++row;
col = 0;
// Eat the character
++p;
// Check for \n\r sequence, and treat this as a single
// character. (Yes, this bizarre thing does occur still
// on some arcane platforms...)
if (*p == '\r') {
++p;
}
break;
case '\t':
// Eat the character
++p;
// Skip to next tab stop
col = (col / tabsize + 1) * tabsize;
break;
case TIXML_UTF_LEAD_0:
if ( encoding == TIXML_ENCODING_UTF8 )
{
if ( *(p+1) && *(p+2) )
{
// In these cases, don't advance the column. These are
// 0-width spaces.
if ( *(pU+1)==TIXML_UTF_LEAD_1 && *(pU+2)==TIXML_UTF_LEAD_2 )
p += 3;
else if ( *(pU+1)==0xbfU && *(pU+2)==0xbeU )
p += 3;
else if ( *(pU+1)==0xbfU && *(pU+2)==0xbfU )
p += 3;
else
{ p +=3; ++col; } // A normal character.
}
}
else
{
++p;
++col;
}
break;
default:
if ( encoding == TIXML_ENCODING_UTF8 )
{
// Eat the 1 to 4 byte utf8 character.
int step = TiXmlBase::utf8ByteTable[*((const unsigned char*)p)];
if ( step == 0 )
step = 1; // Error case from bad encoding, but handle gracefully.
p += step;
回复 5# BetonArmEE