// -----------------------------------------------------------------------
// Implementation of delete and keep
private static String modify(String str, String[] set, boolean expect) {
TSCharSet chars = evaluateSet(set);
StringBuffer buffer = new StringBuffer(str.length());
char[] chrs = str.toCharArray();
int sz = chrs.length;
for (int i = 0; i < sz; i++) {
if (chars.contains(chrs[i]) == expect) {
buffer.append(chrs[i]);
}
}
return buffer.toString();
}
/**
* Takes an argument in set-syntax, see evaluateSet, and returns the number of characters present
* in the specified string.
*
* <p>An example would be:
*
* <ul>
* <li>count("hello", {"c-f", "o"}) returns 2.
* </ul>
*
* @see #evaluateSet(java.lang.String[]) for set-syntax.
* @param str String to count characters in, may be null
* @param set String[] set of characters to count, may be null
* @return character count, zero if null string input
*/
public static int count(String str, String[] set) {
if (str == null || str.length() == 0 || set == null || set.length == 0) {
return 0;
}
TSCharSet chars = evaluateSet(set);
int count = 0;
char[] chrs = str.toCharArray();
int sz = chrs.length;
for (int i = 0; i < sz; i++) {
if (chars.contains(chrs[i])) {
count++;
}
}
return count;
}
/**
* Squeezes any repititions of a character that is mentioned in the supplied set.
*
* <p>An example is:
*
* <ul>
* <li>squeeze("hello", {"el"}) => "helo"
* </ul>
*
* @see #evaluateSet(java.lang.String[]) for set-syntax.
* @param str the string to squeeze, may be null
* @param set the character set to use for manipulation, may be null
* @return modified String, <code>null</code> if null string input
*/
public static String squeeze(String str, String[] set) {
if (str == null || str.length() == 0 || set == null || set.length == 0) {
return str;
}
TSCharSet chars = evaluateSet(set);
StringBuffer buffer = new StringBuffer(str.length());
char[] chrs = str.toCharArray();
int sz = chrs.length;
char lastChar = ' ';
char ch = ' ';
for (int i = 0; i < sz; i++) {
ch = chrs[i];
if (chars.contains(ch)) {
if ((ch == lastChar) && (i != 0)) {
continue;
}
}
buffer.append(ch);
lastChar = ch;
}
return buffer.toString();
}
