103 lines
3.3 KiB
Java
103 lines
3.3 KiB
Java
package de.marhali.easyi18n.util;
|
|
|
|
import org.jetbrains.annotations.NotNull;
|
|
|
|
import java.io.StringWriter;
|
|
import java.util.regex.Pattern;
|
|
|
|
/**
|
|
* String utilities
|
|
* @author marhali, Apache Commons
|
|
*/
|
|
public class StringUtil {
|
|
|
|
/**
|
|
* Checks if the provided String represents a hexadecimal number.
|
|
* For example: {@code 0x100...}, {@code -0x100...} and {@code +0x100...}.
|
|
* @param string String to evaluate
|
|
* @return true if hexadecimal string otherwise false
|
|
*/
|
|
public static boolean isHexString(@NotNull String string) {
|
|
final Pattern hexNumberPattern = Pattern.compile("[+-]?0[xX][0-9a-fA-F]+");
|
|
return hexNumberPattern.matcher(string).matches();
|
|
}
|
|
|
|
/**
|
|
* Escapes control characters for the given input string.
|
|
* Inspired by Apache Commons (see {@link org.apache.commons.text.StringEscapeUtils}
|
|
* @param input The input string
|
|
* @param skipStrings Should every string literal indication ("", '') be skipped? (Needed e.g. for json)
|
|
* @return Escaped string
|
|
*/
|
|
public static @NotNull String escapeControls(@NotNull String input, boolean skipStrings) {
|
|
int length = input.length();
|
|
StringWriter out = new StringWriter(length * 2);
|
|
|
|
for(int i = 0; i < length; i++) {
|
|
char ch = input.charAt(i);
|
|
|
|
if(ch < ' ') {
|
|
switch(ch) {
|
|
case '\b':
|
|
out.write(92);
|
|
out.write(98);
|
|
break;
|
|
case '\t':
|
|
out.write(92);
|
|
out.write(116);
|
|
break;
|
|
case '\n':
|
|
out.write(92);
|
|
out.write(110);
|
|
break;
|
|
case '\u000b':
|
|
default:
|
|
if (ch > 15) {
|
|
out.write("\\u00" + hex(ch));
|
|
} else {
|
|
out.write("\\u000" + hex(ch));
|
|
}
|
|
break;
|
|
case '\f':
|
|
out.write(92);
|
|
out.write(102);
|
|
break;
|
|
case '\r':
|
|
out.write(92);
|
|
out.write(114);
|
|
}
|
|
} else {
|
|
switch(ch) {
|
|
case '"':
|
|
if(!skipStrings) {
|
|
out.write(92);
|
|
}
|
|
out.write(34);
|
|
break;
|
|
case '\'':
|
|
if(!skipStrings) {
|
|
out.write(92);
|
|
}
|
|
out.write(39);
|
|
break;
|
|
case '/':
|
|
out.write(92);
|
|
out.write(47);
|
|
break;
|
|
case '\\':
|
|
out.write(92);
|
|
out.write(92);
|
|
break;
|
|
default:
|
|
out.write(ch);
|
|
}
|
|
}
|
|
}
|
|
|
|
return out.toString();
|
|
}
|
|
|
|
private static @NotNull String hex(char ch) {
|
|
return Integer.toHexString(ch).toUpperCase();
|
|
}
|
|
} |