unicode::wordbreak_callback_base, unicode::wordbreak_callback_base — unicode word-breaking rules


#include <courier-unicode.h>

class wordbreak : public unicode::wordbreak_callback_base {


    using unicode::wordbreak_callback_base::operator<<;
    using unicode::wordbreak_callback_base::operator();
    int callback(bool flag)
        // ...

unicode_char c;
std::vector<unicode_char> buf;

wordbreak compute_wordbreak;

compute_wordbreak << c;

compute_wordbreak(buf.begin(), buf.end());


// ...

unicode_wordbreakscan scan;

scan << c;

size_t nchars=scan.finish();


unicode::wordbreak_callback_base is a C++ binding for the unicode word-breaking rule implementation described in unicode_word_break(3).

Subclass unicode::wordbreak_callback_base and implement callback() that's virtually inherited from unicode::wordbreak_callback_base. The callback() callback function receives the output values from the word-breaking algorithm, namely a bool indicating whether a word break exists before the unicode character in the underlying input sequence.

callback() should return 0. A non-zero return reports an error, that stops the word-breaking algorithm. See unicode_word_break(3) for more information.

The input unicode characters for the word-breaking algorithm are provided by the << operator, one unicode character at a time; or by the () operator, passing either a container, or a beginning and an ending iterator value for an input sequence of unicode characters. finish() indicates the end of the unicode character sequence.

unicode::wordbreakscan is a C++ binding for the unicode_wbscan_init(), unicode_wbscan_next() and unicode_wbscan_end methods described in unicode_word_break(3). Its << iterates over the unicode characters, and finish() indicates the number of characters before the first unicode word break. The << iterator returns a bool indicating when the first word break has already been found, so further calls are not necessary.