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// Copyright 2016 Yahoo Inc. 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.ANTLRInputStream;
import org.antlr.v4.runtime.CharStream;
import java.io.IOException;
import java.io.InputStream;
/**
* Enable ANTLR to do case insensitive comparisons when reading from files without throwing away the case in the token.
*/
class CaseInsensitiveInputStream extends ANTLRInputStream {
public CaseInsensitiveInputStream() {
super();
}
public CaseInsensitiveInputStream(InputStream input) throws IOException {
super(input);
}
public CaseInsensitiveInputStream(InputStream input, int size) throws IOException {
super(input, size);
}
public CaseInsensitiveInputStream(char[] data, int numberOfActualCharsInArray) throws IOException {
super(data, numberOfActualCharsInArray);
}
public CaseInsensitiveInputStream(String input) throws IOException {
super(input);
}
@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]);
}
}
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