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/*
* Licensed to the Apache Software Foundation (ASF) under one
* or more contributor license agreements. See the NOTICE file
* distributed with this work for additional information
* regarding copyright ownership. The ASF licenses this file
* to you under the Apache License, Version 2.0 (the
* "License"); you may not use this file except in compliance
* with the License. You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package streaming.dsl;
import java.io.IOException;
import org.antlr.v4.runtime.ANTLRInputStream;
import org.antlr.v4.runtime.CharStream;
import org.antlr.v4.runtime.misc.Interval;
/**
* Created by fchen on 2018/9/6.
*/
public class CaseChangingCharStream implements CharStream {
final CharStream stream;
final boolean upper;
/**
* Constructs a new CaseChangingCharStream wrapping the given {@link CharStream} forcing
* all characters to upper case or lower case.
* @param stream The stream to wrap.
* @param upper If true force each symbol to upper case, otherwise force to lower.
*/
public CaseChangingCharStream(CharStream stream, boolean upper) {
this.stream = stream;
this.upper = upper;
}
public CaseChangingCharStream(CharStream stream) {
this.stream = stream;
this.upper = true;
}
public CaseChangingCharStream(String string) throws IOException {
// ByteArrayInputStream bais = new ByteArrayInputStream(string.getBytes());
CharStream stream = new ANTLRInputStream(string);
this.stream = stream;
this.upper = false;
}
@Override
public String getText(Interval interval) {
return stream.getText(interval);
}
@Override
public void consume() {
stream.consume();
}
@Override
public int LA(int i) {
int c = stream.LA(i);
if (c <= 0) {
return c;
}
if (upper) {
return Character.toUpperCase(c);
}
return Character.toLowerCase(c);
}
@Override
public int mark() {
return stream.mark();
}
@Override
public void release(int marker) {
stream.release(marker);
}
@Override
public int index() {
return stream.index();
}
@Override
public void seek(int index) {
stream.seek(index);
}
@Override
public int size() {
return stream.size();
}
@Override
public String getSourceName() {
return stream.getSourceName();
}
}