/**
* Converts char digit into integer value. Accepts numeric chars (0 - 9) as well as letter (A-z).
*/
public static int parseDigit(char digit) {
if ((digit >= '0') && (digit <= '9')) {
return digit - '0';
}
if (CharUtil.isLowercaseAlpha(digit)) {
return 10 + digit - 'a';
}
return 10 + digit - 'A';
}
/**
* Returns the string with all regex controll characters escaped.<br>
* The result from this operation should return a pattern which the input string matches.<br>
* WARNING: this method does not escape newline characters and for strings containing newline
* characters the input will not match the result pattern.<br>
*
* @param input
* @return
*/
public static String getEscaped(String input) {
StringBuilder sb = new StringBuilder();
for (int i = 0; i < input.length(); i++) {
char ch = input.charAt(i);
boolean escape = CharUtil.isRegexControlChar(ch);
if (escape) {
sb.append('\\');
}
sb.append(ch);
}
return sb.toString();
}
/** @throws Exception */
@Test
public void test() throws Exception {
assertTrue(CharUtil.isAscii('a'));
assertFalse(CharUtil.isAscii('あ'));
}
public static boolean isName(int c) {
return c == ':' || c == '_' || CharUtil.isLetter(c);
}