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/* ____ ____ ____ ____ ______ *\
** / __// __ \/ __// __ \/ ____/ SOcos COmpiles Scala **
** __\_ \/ /_/ / /__/ /_/ /\_ \ (c) 2002, LAMP/EPFL **
** /_____/\____/\___/\____/____/ **
\* */
// $Id$
package ch.epfl.lamp.util;
import java.io.Writer;
import java.io.StringWriter;
import java.io.IOException;
/**
* This class provides methods for printing code. It has support for
* indentation and spacing.
*/
public class CodePrinter {
//########################################################################
// Public Constants
/** The default indentation string */
public static final String STEP = " ";
/** The line separator */
public static final String LINE = System.getProperty("line.separator");
//########################################################################
// Private Fields
/** The underlying writer */
private final Writer writer;
/** The indentation string */
private String step;
/** The indentation level */
private int level;
/** Do we need to align? */
private boolean align;
/** Do we need to print a white space? */
private boolean space;
/** Is there already a empty line? */
private boolean line;
//########################################################################
// Public Constructors
/** Creates a new instance. */
public CodePrinter() {
this(new StringWriter());
}
/** Creates a new instance. */
public CodePrinter(String step) {
this(new StringWriter(), step);
}
/** Creates a new instance. */
public CodePrinter(Writer writer) {
this(writer, STEP);
}
/** Creates a new instance. */
public CodePrinter(Writer writer, String step) {
this.writer = writer;
this.step = step;
this.level = 0;
this.align = true;
this.space = false;
this.line = false;
}
//########################################################################
// Public Methods - Getting & Setting
/** Returns the underlying writer. */
public Writer getWriter() {
return writer;
}
/** Returns the indentation level. */
public int getIndentLevel() {
return level;
}
/** Returns the indentation width. */
public int getIndentWidth() {
return step == null ? -1 : step.length();
}
/** Returns the indentation string. */
public String getIndentString() {
return step;
}
/** Sets the indentation level. */
public CodePrinter setIndentLevel(int level) {
this.level = level;
return this;
}
/** Sets the indentation width. */
public CodePrinter setIndentWidth(int width) {
StringBuffer buffer = new StringBuffer(width);
for (int i = 0; i < width; i++) buffer.append(' ');
return setIndentString(buffer.toString());
}
/** Sets the indentation string. */
public CodePrinter setIndentString(String step) {
this.step = step;
return this;
}
//########################################################################
// Public Methods - Formating
/** Increases the indentation level by one. */
public CodePrinter indent() {
level++;
return this;
}
/** Decreases the indentation level by one. */
public CodePrinter undent() {
level--;
return this;
}
/** Inserts a new line. */
public CodePrinter line() {
if (step == null) return space();
if (line) return this;
write(LINE);
line = align;
align = true;
space = false;
return this;
}
/** Inserts a white space. */
public CodePrinter space() {
space = !align;
return this;
}
//########################################################################
// Public Methods - Printing
/** Prints a new line. */
public CodePrinter println() {
return line();
}
/** Prints the boolean value followed by a new line. */
public CodePrinter println(boolean value) {
return print(value).line();
}
/** Prints the byte value followed by a new line. */
public CodePrinter println(byte value) {
return print(value).line();
}
/** Prints the short value followed by a new line. */
public CodePrinter println(short value) {
return print(value).line();
}
/** Prints the char value followed by a new line. */
public CodePrinter println(char value) {
return print(value).line();
}
/** Prints the int value followed by a new line. */
public CodePrinter println(int value) {
return print(value).line();
}
/** Prints the long value followed by a new line. */
public CodePrinter println(long value) {
return print(value).line();
}
/** Prints the float value followed by a new line. */
public CodePrinter println(float value) {
return print(value).line();
}
/** Prints the double value followed by a new line. */
public CodePrinter println(double value) {
return print(value).line();
}
/** Prints the string followed by a new line. */
public CodePrinter println(String value) {
return print(value).line();
}
/** Prints the boolean value. */
public CodePrinter print(boolean value) {
return print(String.valueOf(value));
}
/** Prints the byte value. */
public CodePrinter print(byte value) {
return print(String.valueOf(value));
}
/** Prints the short value. */
public CodePrinter print(short value) {
return print(String.valueOf(value));
}
/** Prints the char value. */
public CodePrinter print(char value) {
return print(String.valueOf(value));
}
/** Prints the int value. */
public CodePrinter print(int value) {
return print(String.valueOf(value));
}
/** Prints the long value. */
public CodePrinter print(long value) {
return print(String.valueOf(value));
}
/** Prints the float value. */
public CodePrinter print(float value) {
return print(String.valueOf(value));
}
/** Prints the long value. */
public CodePrinter print(double value) {
return print(String.valueOf(value));
}
/** Prints the string. */
public CodePrinter print(String value) {
if (align) for (int i = 0; i < level; i++) write(step);
if (space) write(" ");
write(value);
align = false;
space = false;
line = false;
return this;
}
//########################################################################
// Public Methods - Converting
/** Returns the string representation of this printer. */
public String toString() {
return writer.toString();
}
//########################################################################
// Private Methods
private void write(String string) {
try {
writer.write(string);
} catch (IOException exception) {
throw new Error(exception);
}
}
//########################################################################
}
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