/************************************************************************* Return the index of the first character of the word at 'idx'. *************************************************************************/ String32::size_type TextUtils::getWordStartIdx(const String32& str, String32::size_type idx) { String32 temp = str.substr(0, idx); trimTrailingChars(temp, DefaultWhitespace); if (temp.length() <= 1) { return 0; } // identify the type of character at 'pos' if (String32::npos != DefaultAlphanumerical.find(temp[temp.length() - 1])) { idx = temp.find_last_not_of(DefaultAlphanumerical); } // since whitespace was stripped, character must be a symbol else { idx = temp.find_last_of(DefaultAlphanumerical + DefaultWhitespace); } // make sure we do not go past end of string (+1) if (idx == String32::npos) { return 0; } else { return idx + 1; } }
/************************************************************************* Return the index of the first character of the word after the word at 'idx'. *************************************************************************/ String32::size_type TextUtils::getNextWordStartIdx(const String32& str, String32::size_type idx) { String32::size_type str_len = str.length(); // do some checks for simple cases if ((idx >= str_len) || (str_len == 0)) { return str_len; } // is character at 'idx' alphanumeric if (String32::npos != DefaultAlphanumerical.find(str[idx])) { // find position of next character that is not alphanumeric idx = str.find_first_not_of(DefaultAlphanumerical, idx); } // is character also not whitespace (therefore a symbol) else if (String32::npos == DefaultWhitespace.find(str[idx])) { // find index of next character that is either alphanumeric or whitespace idx = str.find_first_of(DefaultAlphanumerical + DefaultWhitespace, idx); } // check result at this stage. if (String32::npos == idx) { idx = str_len; } else { // if character at 'idx' is whitespace if (String32::npos != DefaultWhitespace.find(str[idx])) { // find next character that is not whitespace idx = str.find_first_not_of(DefaultWhitespace, idx); } if (String32::npos == idx) { idx = str_len; } } return idx; }