/*
* Copyright 2003-2015 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 jetbrains.mps.text.impl;
import jetbrains.mps.text.TextArea;
import org.jetbrains.annotations.NotNull;
import java.util.Arrays;
/**
* @author Artem Tikhomirov
*/
public class TextAreaImpl implements TextArea {
private final StringBuilder myStringBuilder;
private final String myLineSeparator;
private final int myIndentSize;
private int myDepth = 0;
private final char[] mySpaces;
public TextAreaImpl() {
this(new StringBuilder(2048), "\n", ' ', 2);
}
public TextAreaImpl(@NotNull StringBuilder stringBuilder, @NotNull String lineSeparator, char indentChar, int indentSize) {
assert indentSize >= 0;
myStringBuilder = stringBuilder;
myIndentSize = indentSize;
myLineSeparator = lineSeparator;
mySpaces = new char[indentSize * 20];
Arrays.fill(mySpaces, indentChar);
}
@Override
public TextArea append(CharSequence text) {
// XXX mimic TextGenBuffer.append(String) convention. I'm not 100% sure it is correct to silently skip nulls
if (text != null) {
myStringBuilder.append(text);
}
return this;
}
@Override
public TextArea newLine() {
myStringBuilder.append(myLineSeparator);
return this;
}
@Override
public TextArea indent() {
int x = myDepth * myIndentSize;
while (x > 0) {
int c = Math.min(x, mySpaces.length);
myStringBuilder.append(mySpaces, 0, c);
x -= c;
}
return this;
}
@Override
public TextArea increaseIndent() {
myDepth++;
return this;
}
@Override
public TextArea decreaseIndent() {
myDepth--;
assert myDepth >= 0;
return this;
}
@Override
public int length() {
return myStringBuilder.length();
}
/**
* XXX not quite sure yet it should be part of TextArea API or not
* @return actual contents of the text chunk.
*/
@NotNull
public CharSequence value() {
return myStringBuilder;
}
}