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Kotlin Full Reflection Library
/*
* Copyright 2010-2015 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 kotlin.reflect.jvm.internal.impl.utils;
import org.jetbrains.annotations.NotNull;
import java.io.IOException;
import java.util.Collection;
import java.util.Iterator;
public class Printer {
private static final String DEFAULT_INDENTATION_UNIT = " ";
public static final String LINE_SEPARATOR = System.getProperty("line.separator");
private final Appendable out;
private final int maxBlankLines;
private String indent;
private final String indentUnit;
private int blankLineCountIncludingCurrent = 0;
private boolean withholdIndentOnce = false;
private int length = 0;
public Printer(@NotNull Appendable out) {
this(out, Integer.MAX_VALUE);
}
public Printer(@NotNull Appendable out, @NotNull String indentUnit) {
this(out, Integer.MAX_VALUE, indentUnit);
}
public Printer(@NotNull Appendable out, int maxBlankLines) {
this(out, maxBlankLines, DEFAULT_INDENTATION_UNIT);
}
public Printer(@NotNull Appendable out, int maxBlankLines, @NotNull String indentUnit) {
this(out, maxBlankLines, indentUnit, "");
}
private Printer(@NotNull Appendable out, int maxBlankLines, @NotNull String indentUnit, @NotNull String indent) {
this.out = out;
this.maxBlankLines = maxBlankLines;
this.indentUnit = indentUnit;
this.indent = indent;
}
public Printer(@NotNull Appendable out, @NotNull Printer parent) {
this(out, parent.maxBlankLines, parent.indentUnit, parent.indent);
}
private void append(Object o) {
try {
String string = o.toString();
out.append(string);
length += string.length();
}
catch (IOException e) {
// Do nothing
}
}
@NotNull
public Printer println(Object... objects) {
print(objects);
printLineSeparator();
return this;
}
private void printLineSeparator() {
if (blankLineCountIncludingCurrent <= maxBlankLines) {
blankLineCountIncludingCurrent++;
append(LINE_SEPARATOR);
}
}
@NotNull
public Printer print(Object... objects) {
if (withholdIndentOnce) {
withholdIndentOnce = false;
}
else if (objects.length > 0) {
printIndent();
}
printWithNoIndent(objects);
return this;
}
public void printIndent() {
append(indent);
}
@NotNull
public Printer printWithNoIndent(Object... objects) {
for (Object object : objects) {
blankLineCountIncludingCurrent = 0;
append(object);
}
return this;
}
@NotNull
public Printer withholdIndentOnce() {
withholdIndentOnce = true;
return this;
}
@NotNull
public Printer printlnWithNoIndent(Object... objects) {
printWithNoIndent(objects);
printLineSeparator();
return this;
}
@NotNull
public Printer pushIndent() {
indent += indentUnit;
return this;
}
@NotNull
public Printer popIndent() {
if (indent.length() < indentUnit.length()) {
throw new IllegalStateException("No indentation to pop");
}
indent = indent.substring(indentUnit.length());
return this;
}
@NotNull
public Printer separated(Object separator, Object... items) {
for (int i = 0; i < items.length; i++) {
if (i > 0) {
printlnWithNoIndent(separator);
}
printlnWithNoIndent(items[i]);
}
return this;
}
@NotNull
public Printer separated(Object separator, Collection items) {
for (Iterator iterator = items.iterator(); iterator.hasNext(); ) {
printlnWithNoIndent(iterator.next());
if (iterator.hasNext()) {
printlnWithNoIndent(separator);
}
}
return this;
}
public boolean isEmpty() {
return length == 0;
}
@Override
public String toString() {
return out.toString();
}
}