org.apache.jena.atlas.io.IndentedWriter Maven / Gradle / Ivy
/*
* 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 org.apache.jena.atlas.io;
import static java.lang.String.format ;
import java.io.IOException ;
import java.io.OutputStream ;
import java.io.PrintStream ;
import java.io.Writer ;
import org.apache.jena.atlas.lib.Closeable ;
/** A writer that records what the current indentation level is, and
* uses that to insert a prefix at each line.
* It can also insert line numbers at the beginning of lines. */
public class IndentedWriter extends AWriterBase implements AWriter, Closeable
{
/** Stdout wrapped in an IndentedWriter - no line numbers */
public static final IndentedWriter stdout = new IndentedWriter(System.out) ;
/** Stderr wrapped in an IndentedWriter - no line numbers */
public static final IndentedWriter stderr = new IndentedWriter(System.err) ;
static {
stdout.setFlushOnNewline(true) ;
stderr.setFlushOnNewline(true) ;
}
// Note cases:if (!flatMode)
// 1/ incIndent - decIndent with no output should not cause any padding
// 2/ newline() then no text, then finish should not cause a line number.
protected Writer out = null ;
protected static final int INDENT = 2 ;
protected int unitIndent = INDENT ;
protected int currentIndent = 0 ;
protected int column = 0 ;
protected int row = 1 ;
protected boolean lineNumbers = false ;
protected boolean startingNewLine = true ;
private char padChar = ' ' ;
private String endOfLineMarker = null ; // Null means none.
private String padString = null ;
private String linePrefix = null ;
protected boolean flatMode = false ;
private boolean flushOnNewline = false ;
/** Construct a UTF8 IndentedWriter around an OutputStream */
public IndentedWriter(OutputStream outStream) { this(outStream, false) ; }
/** Construct a UTF8 IndentedWriter around an OutputStream */
public IndentedWriter(OutputStream outStream, boolean withLineNumbers) {
this(makeWriter(outStream), withLineNumbers) ;
}
private static Writer makeWriter(OutputStream out) {
// return BufferingWriter.create(out) ;
return IO.asBufferedUTF8(out) ;
}
/** Using Writers directly is discouraged */
protected IndentedWriter(Writer writer) { this(writer, false) ; }
/** Using Writers directly is discouraged */
protected IndentedWriter(Writer writer, boolean withLineNumbers) {
out = writer ;
lineNumbers = withLineNumbers ;
startingNewLine = true ;
}
@Override
public void print(String str) {
if ( str == null )
str = "null" ;
if ( false ) {
// Don't check for embedded newlines.
write$(str) ;
return ;
}
for ( int i = 0 ; i < str.length() ; i++ )
printOneChar(str.charAt(i)) ;
}
@Override
public void printf(String formatStr, Object... args) {
print(format(formatStr, args)) ;
}
@Override
public void print(char ch) { printOneChar(ch) ; }
@Override
public void println(String str) { print(str) ; newline() ; }
public void println(char ch) { print(ch) ; newline() ; }
@Override
public void println() { newline() ; }
@Override
public void print(char[] cbuf) {
for ( char aCbuf : cbuf ) {
printOneChar(aCbuf) ;
}
}
/** Print a string N times */
public void print(String s, int n) {
for ( int i = 0 ; i < n ; i++ )
print(s) ;
}
/** Print a char N times */
public void print(char ch, int n) {
lineStart() ;
for ( int i = 0 ; i < n ; i++ )
printOneChar(ch) ;
}
private char lastChar = '\0' ;
// Worker
private void printOneChar(char ch) {
// Turn \r\n into a single newline call.
// Assumes we don't get \r\r\n etc
if ( ch == '\n' && lastChar == '\r' ) {
lastChar = ch ;
return ;
}
lineStart() ;
lastChar = ch ;
// newline
if ( ch == '\n' || ch == '\r' ) {
newline() ;
return ;
}
write$(ch) ;
column += 1 ;
}
private void write$(char ch)
{ try { out.write(ch) ; } catch (IOException ex) { IO.exception(ex); } }
private void write$(String s)
{ try { out.write(s) ; } catch (IOException ex) { IO.exception(ex); } }
public void newline() {
lineStart() ;
if ( endOfLineMarker != null )
print(endOfLineMarker) ;
if ( !flatMode )
write$('\n') ;
startingNewLine = true ;
row++ ;
column = 0 ;
// Note that PrintWriters do not autoflush by default
// so if layered over a PrintWriter, need to flush that as well.
if ( flushOnNewline )
flush() ;
}
private boolean atStartOfLine() { return column <= currentIndent ; }
public void ensureStartOfLine() {
if ( !atStartOfLine() )
newline() ;
}
@Override
public void close() { IO.close(out) ; }
@Override
public void flush() { IO.flush(out); }
/** Pad to the indent (if we are before it) */
public void pad() {
if ( startingNewLine && currentIndent > 0 )
lineStart() ;
padInternal() ;
}
/** Pad to a given number of columns EXCLUDING the indent.
*
* @param col Column number (first column is 1).
*/
public void pad(int col) { pad(col, false) ; }
/** Pad to a given number of columns maybe including the indent.
*
* @param col Column number (first column is 1).
* @param absoluteColumn Whether to include the indent
*/
public void pad(int col, boolean absoluteColumn) {
// Make absolute
if ( !absoluteColumn )
col = col + currentIndent ;
int spaces = col - column ;
for ( int i = 0 ; i < spaces ; i++ ) {
write$(' ') ; // Always a space.
column++ ;
}
}
private void padInternal() {
if ( padString == null ) {
for ( int i = column ; i < currentIndent ; i++ ) {
write$(padChar) ;
column++ ;
}
} else {
for ( int i = column ; i < currentIndent ; i += padString.length() ) {
write$(padString) ;
column += padString.length() ;
}
}
}
/** Get row/line (counts from 1) */
public int getRow() { return row ; }
/** Get the absolute column.
* This is the location where the next charcter on the line will be printed.
* The IndentedWriter may not yet have padded to this place.
*/
public int getCol() {
if ( currentIndent > column )
return currentIndent ;
return column ;
}
/** Get indent from the left hand edge */
public int getAbsoluteIndent() { return currentIndent ; }
/** Set indent from the left hand edge */
public void setAbsoluteIndent(int x) { currentIndent = x ; }
/** Position past current indent */
public int getCurrentOffset() {
int x = getCol() - getAbsoluteIndent() ;
if ( x >= 0 )
return x ;
// At start of line somehow.
return 0 ;
}
public boolean hasLineNumbers() {
return lineNumbers ;
}
public void setLineNumbers(boolean lineNumbers) {
this.lineNumbers = lineNumbers ;
}
public String getEndOfLineMarker() { return endOfLineMarker ; }
/** Set the marker included at end of line - set to null for "none". Usually used for debugging. */
public void setEndOfLineMarker(String marker) { endOfLineMarker = marker ; }
/** Flat mode - print without NL, for a more compact representation*/
public boolean inFlatMode() { return flatMode ; }
/** Flat mode - print without NL, for a more compact representation*/
public void setFlatMode(boolean flatMode) { this.flatMode = flatMode ; }
/** Flush on newline **/
public boolean getFlushOnNewline() { return flushOnNewline; }
/** Flush on newline in this code.
* This is set for {@link IndentedWriter#stdout} and {@link IndentedWriter#stderr}
* but not by default otherwise. The underlying output, if it is a {@link PrintStream}
* may also have a flush on newline as well (e.g {@link System#out}).
*/
public void setFlushOnNewline(boolean flushOnNewline)
{ this.flushOnNewline = flushOnNewline; }
public char getPadChar() { return padChar ; }
public void setPadChar(char ch) { this.padChar = ch ; }
public String getPadString() { return padString ; }
public void setPadString(String str) { this.padString = str ; unitIndent = str.length(); }
/** Initial string printed at the start of each line : defaults to no string. */
public String getLinePrefix() { return linePrefix ; }
/** Set the initial string printed at the start of each line. */
public void setLinePrefix(String str) { this.linePrefix = str ; }
public void incIndent() { incIndent(unitIndent) ; }
public void incIndent(int x) {
currentIndent += x ;
}
public void decIndent() { decIndent(unitIndent) ; }
public void decIndent(int x) {
currentIndent -= x ;
}
public void setUnitIndent(int x) { unitIndent = x ; }
public int getUnitIndent() { return unitIndent ; }
public boolean atLineStart() { return startingNewLine ; }
// A line is prefix?number?content.
private void lineStart() {
if ( flatMode ) {
if ( startingNewLine && row > 1 )
// Space between each line.
write$(' ') ;
startingNewLine = false ;
return ;
}
// Need to do its just before we append anything, not after a NL,
// so that a final blank does not cause a prefix or line number.
if ( startingNewLine ) {
if ( linePrefix != null )
write$(linePrefix) ;
insertLineNumber() ;
}
padInternal() ;
startingNewLine = false ;
}
private int widthLineNumber = 3 ;
/** Width of the number field */
public int getNumberWidth() { return widthLineNumber ; }
/** Set the width of the number field.
* There is also a singel space after the number not included in this setting.
*/
public void setNumberWidth(int widthOfNumbers) { widthLineNumber = widthOfNumbers ; }
private void insertLineNumber() {
if ( !lineNumbers )
return ;
String s = Integer.toString(row) ;
for ( int i = 0 ; i < widthLineNumber - s.length() ; i++ )
write$(' ') ;
write$(s) ;
write$(' ') ;
}
@Override
public String toString() {
return String.format("Indent = %d : [%d, %d]", currentIndent, row, column) ;
}
}
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