public boolean isSplitCharacter(int start,
    int current,
    int end,
    char[] cc,
    PdfChunk[] ck)
Returns true if the character can split a line. The splitting implementation
is free to look ahead or look behind characters to make a decision.

The default implementation is:

public boolean isSplitCharacter(int start, int current, int end, char[] cc, PdfChunk[] ck) {
char c;
if (ck == null)
c = cc[current];
else
c = (char) ck[Math.min(current, ck.length - 1)].getUnicodeEquivalent(cc[current]);
if (c <= ' ' || c == '-') {
return true;
}
if (c < 0x2e80)
return false;
return ((c >= 0x2e80 && c < 0xd7a0)
|| (c >= 0xf900 && c < 0xfb00)
|| (c >= 0xfe30 && c < 0xfe50)
|| (c >= 0xff61 && c < 0xffa0));
}