Here you can find the source of unescapeString(String s)
| Parameter | Description |
|---|---|
| s | An escaped Unicode string. |
| Parameter | Description |
|---|---|
| IllegalArgumentException | If the supplied string is not acorrectly escaped N-Triples string. |
public static String unescapeString(String s)
//package com.java2s;
/*// w w w. j a v a 2s. c o m
* Copyright Aduna (http://www.aduna-software.com/) (c) 1997-2006.
*
* Licensed under the Aduna BSD-style license.
*/
public class Main {
/**
* Unescapes an escaped Unicode string. Any Unicode sequences
* (<tt>\uxxxx</tt> and <tt>\Uxxxxxxxx</tt>) are restored to the
* value indicated by the hexadecimal argument and any backslash-escapes
* (<tt>\"</tt>, <tt>\\</tt>, etc.) are decoded to their original form.
*
* @param s An escaped Unicode string.
* @return The unescaped string.
* @throws IllegalArgumentException If the supplied string is not a
* correctly escaped N-Triples string.
*/
public static String unescapeString(String s) {
int backSlashIdx = s.indexOf('\\');
if (backSlashIdx == -1) {
// No escaped characters found
return s;
}
int startIdx = 0;
int sLength = s.length();
StringBuilder sb = new StringBuilder(sLength);
while (backSlashIdx != -1) {
sb.append(s.substring(startIdx, backSlashIdx));
if (backSlashIdx + 1 >= sLength) {
throw new IllegalArgumentException(
"Unescaped backslash in: " + s);
}
char c = s.charAt(backSlashIdx + 1);
if (c == 't') {
sb.append('\t');
startIdx = backSlashIdx + 2;
} else if (c == 'r') {
sb.append('\r');
startIdx = backSlashIdx + 2;
} else if (c == 'n') {
sb.append('\n');
startIdx = backSlashIdx + 2;
} else if (c == '"') {
sb.append('"');
startIdx = backSlashIdx + 2;
} else if (c == '\\') {
sb.append('\\');
startIdx = backSlashIdx + 2;
} else if (c == 'u') {
// \\uxxxx
if (backSlashIdx + 5 >= sLength) {
throw new IllegalArgumentException(
"Incomplete Unicode escape sequence in: " + s);
}
String xx = s.substring(backSlashIdx + 2, backSlashIdx + 6);
try {
c = (char) Integer.parseInt(xx, 16);
sb.append(c);
startIdx = backSlashIdx + 6;
} catch (NumberFormatException e) {
throw new IllegalArgumentException(
"Illegal Unicode escape sequence '\\u" + xx
+ "' in: " + s);
}
} else if (c == 'U') {
// \\Uxxxxxxxx
if (backSlashIdx + 9 >= sLength) {
throw new IllegalArgumentException(
"Incomplete Unicode escape sequence in: " + s);
}
String xx = s
.substring(backSlashIdx + 2, backSlashIdx + 10);
try {
c = (char) Integer.parseInt(xx, 16);
sb.append(c);
startIdx = backSlashIdx + 10;
} catch (NumberFormatException e) {
throw new IllegalArgumentException(
"Illegal Unicode escape sequence '\\U" + xx
+ "' in: " + s);
}
} else {
throw new IllegalArgumentException(
"Unescaped backslash in: " + s);
}
backSlashIdx = s.indexOf('\\', startIdx);
}
sb.append(s.substring(startIdx));
return sb.toString();
}
}