TextBoundaries.cpp [plain text]
#include "config.h"
#include "TextBoundaries.h"
#include "TextBreakIterator.h"
#include <wtf/text/StringImpl.h>
#include <wtf/unicode/Unicode.h>
using namespace WTF;
using namespace Unicode;
namespace WebCore {
int endOfFirstWordBoundaryContext(const UChar* characters, int length)
{
for (int i = 0; i < length; ) {
int first = i;
UChar32 ch;
U16_NEXT(characters, i, length, ch);
if (!requiresContextForWordBoundary(ch))
return first;
}
return length;
}
int startOfLastWordBoundaryContext(const UChar* characters, int length)
{
for (int i = length; i > 0; ) {
int last = i;
UChar32 ch;
U16_PREV(characters, 0, i, ch);
if (!requiresContextForWordBoundary(ch))
return last;
}
return 0;
}
#if !PLATFORM(MAC) && !PLATFORM(QT)
int findNextWordFromIndex(const UChar* chars, int len, int position, bool forward)
{
TextBreakIterator* it = wordBreakIterator(chars, len);
if (forward) {
position = textBreakFollowing(it, position);
while (position != TextBreakDone) {
if (position < len && isAlphanumeric(chars[position - 1]))
return position;
position = textBreakFollowing(it, position);
}
return len;
} else {
position = textBreakPreceding(it, position);
while (position != TextBreakDone) {
if (position > 0 && isAlphanumeric(chars[position]))
return position;
position = textBreakPreceding(it, position);
}
return 0;
}
}
void findWordBoundary(const UChar* chars, int len, int position, int* start, int* end)
{
TextBreakIterator* it = wordBreakIterator(chars, len);
*end = textBreakFollowing(it, position);
if (*end < 0)
*end = textBreakLast(it);
*start = textBreakPrevious(it);
}
#endif // !PLATFORM(MAC) && !PLATFORM(QT)
}