blob: 3ca61368fcb60d462a05891745b3c19d42a86220 (
plain) (
blame)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
|
// Copyright Yahoo. Licensed under the terms of the Apache 2.0 license. See LICENSE in the project root.
package com.yahoo.text;
/**
* This class is used to represent a legal identifier of [a-zA-Z_][a-zA-Z_0-9]*
*
* @author baldersheim
*/
public class Identifier extends Utf8Array {
public Identifier(String s) {
this(Utf8.toBytes(s));
}
public Identifier(AbstractUtf8Array utf8) {
this(utf8.getBytes());
}
public Identifier(byte [] utf8) {
super(verify(utf8));
}
private static byte [] verify(final byte [] utf8) {
if (utf8.length > 0) {
verifyFirst(utf8[0], utf8);
for (int i=1; i < utf8.length; i++) {
verifyAny(utf8[i], utf8);
}
}
return utf8;
}
private static boolean verifyFirst(byte c, byte [] identifier) {
if (!((c == '_') || ((c >= 'a') && (c <= 'z')) || ((c >= 'A') && (c <= 'Z')))) {
throw new IllegalArgumentException("Illegal starting character '" + (char)c + "' of identifier '" + new Utf8String(new Utf8Array(identifier)).toString() +"'.");
}
return true;
}
private static boolean verifyAny(byte c, byte [] identifier) {
if (!((c == '_') || ((c >= 'a') && (c <= 'z')) || ((c >= 'A') && (c <= 'Z')) || ((c >= '0') && (c <= '9')))) {
throw new IllegalArgumentException("Illegal character '" + (char)c + "' of identifier '" + new Utf8String(new Utf8Array(identifier)).toString() +"'.");
}
return true;
}
}
|
