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CharRange.java
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CharRange.java
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/*
* Copyright 2010-2012 JetBrains s.r.o.
*
* Licensed 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 jet;
import org.jetbrains.jet.rt.annotation.AssertInvisibleInResolver;
@AssertInvisibleInResolver
public final class CharRange implements Range<Character>, CharIterable {
private final char start;
private final int count;
public static final CharRange empty = new CharRange((char) 0,0);
public CharRange(char startValue, int count) {
this.start = startValue;
this.count = count;
}
@Override
public boolean contains(Character item) {
if (item == null) return false;
if (count >= 0) {
return item >= start && item < start + count;
}
return item <= start && item > start + count;
}
public boolean getIsReversed() {
return count < 0;
}
public char getStart() {
return start;
}
public char getIteratorStart () {
return count == 0 ? 1 : start;
}
public char getEnd() {
return (char) (count < 0 ? start + count + 1: count == 0 ? 0 : start+count-1);
}
public int getSize() {
return count < 0 ? -count : count;
}
public CharRange minus() {
return new CharRange(getEnd(), -count);
}
public CharIterator step(int step) {
if(step < 0)
return new MyIterator(getEnd(), -count, -step);
else
return new MyIterator(start, count, step);
}
@Override
public CharIterator iterator() {
return new MyIterator(start, count, 1);
}
public static CharRange count(int length) {
return new CharRange((char) 0, length);
}
private static class MyIterator extends CharIterator {
private char cur;
private int step;
private int count;
private final boolean reversed;
public MyIterator(char startValue, int count, int step) {
cur = startValue;
this.step = step;
if(count < 0) {
reversed = true;
count = -count;
startValue += count;
}
else {
reversed = false;
}
this.count = count;
}
@Override
public boolean getHasNext() {
return count > 0;
}
@Override
public char nextChar() {
count -= step;
if(reversed) {
cur -= step;
return (char) (cur + step);
}
else {
cur += step;
return (char) (cur - step);
}
}
}
}