blob: 0f83fd40cc1673aa463247442a3fee6c11d7b2bc (
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
|
// Copyright Yahoo. Licensed under the terms of the Apache 2.0 license. See LICENSE in the project root.
package com.yahoo.search.yql;
import org.antlr.v4.runtime.ANTLRFileStream;
import org.antlr.v4.runtime.CharStream;
import java.io.IOException;
/**
* Enable ANTLR to do case insensitive comparisons when reading from files without throwing away the case in the token.
*/
class CaseInsensitiveFileStream extends ANTLRFileStream {
public CaseInsensitiveFileStream(String fileName) throws IOException {
super(fileName);
}
@Override
public int LA(int i) {
if (i == 0) {
return 0;
}
if (i < 0) {
i++; // e.g., translate LA(-1) to use offset 0
}
if ((p + i - 1) >= n) {
return CharStream.EOF;
}
return Character.toLowerCase(data[p + i - 1]);
}
}
|