private boolean delete(String from) {
if (null != from && from.length() == 3 && from.charAt(1) == '-') {
char from_start = from.charAt(0);
char from_end = from.charAt(2);
for (int i = 0; i < sb_.length(); ++i) {
char current_char = sb_.charAt(i);
if (current_char >= from_start && current_char <= from_end) {
sb_.deleteCharAt(i);
--i;
}
}
return true;
} else {
boolean changed = false;
for (int i = 0; i < from.length(); i++) {
int index = sb_.toString().indexOf(from.charAt(i));
while (index >= 0) {
sb_.deleteCharAt(index);
changed = true;
index = sb_.toString().indexOf(from.charAt(i));
}
}
return changed;
}
}
/// @return false if no change made
// TODO handle more situations
private boolean transform(String from, String to, boolean remove_duplicate) {
String oldString = sb_.toString();
if (from.length() == 3 && to.length() == 3 && from.charAt(1) == '-' && to.charAt(1) == '-') {
char from_start = from.charAt(0);
char from_end = from.charAt(2);
char to_start = to.charAt(0);
char to_end = to.charAt(2);
char last_char = 0;
for (int i = 0; i < sb_.length(); ++i) {
char current_char = sb_.charAt(i);
if (current_char >= from_start && current_char <= from_end) {
if (remove_duplicate && last_char == current_char) {
sb_.deleteCharAt(i);
--i;
} else {
int replace_char = (current_char - from_start) + to_start;
sb_.setCharAt(i, replace_char < to_end ? (char) replace_char : to_end);
last_char = current_char;
}
}
}
} else {
char last_char = 0;
for (int i = 0; i < sb_.length(); ++i) {
char current_char = sb_.charAt(i);
int index = from.indexOf(current_char);
if (index >= 0) {
if (remove_duplicate && last_char == current_char) {
sb_.deleteCharAt(i);
--i;
} else {
char replace_char = to.charAt(index < to.length() ? index : to.length());
sb_.setCharAt(i, replace_char);
last_char = current_char;
}
}
}
}
return !oldString.equals(sb_.toString());
}
private boolean squeeze(String from) {
if (null != from && from.length() == 3 && from.charAt(1) == '-') {
char from_start = from.charAt(0);
char from_end = from.charAt(2);
char last_char = 0;
for (int i = 0; i < sb_.length(); ++i) {
char current_char = sb_.charAt(i);
if (current_char >= from_start && current_char <= from_end) {
if (last_char == current_char) {
sb_.deleteCharAt(i);
--i;
} else {
last_char = current_char;
}
}
}
return true;
}
// TODO handle more situations
return false;
}