scale.common
Class Emit

java.lang.Object
  scale.common.Emit

Direct Known Subclasses:

EmitToFile, EmitToString

public abstract class Emit
extends java.lang.Object

An abstract class for emitting code sequences.

$Id: Emit.java,v 1.17 2005-02-07 21:28:20 burrill Exp $

Copyright 2005 by the Scale Compiler Group,
Department of Computer Science
University of Massachusetts,
Amherst MA. 01003, USA
All Rights Reserved.

The interface supports indentation.

Field Summary

protected int	currentColumn The current output column.
protected int	currentLine The current line number in the generated output.
protected boolean	lineStart true if we are at the start of a line in the generated output.
protected int	numIndent Number of indentation levels - used to record the amount of identatation.
protected int	spaces The amount of indentation spaces per indentation level.

Constructor Summary

Emit(int indent)
Create a class to use in writing out generated code.

Emit(int currentLine, int currentColumn, int indent)
Create a class to use in writing out generated code.

Method Summary

void	decIndLevel() Decrease the amount of space for indentation
abstract void	emit(char c) Print a character to the output.
abstract void	emit(int n) Print an integer to the output.
abstract void	emit(long n) Print a long to the output.
abstract void	emit(java.lang.String s) Print a string to the output.
void	endLine() Signal the end of the current line and start a new one.
int	getCurrentColumn() Return the current output column.
int	getCurrentLine() Return the current line number of the line being generated.
void	incIndLevel() Increment the number of spaces to indent
protected void	indent() Add indentation to output
protected void	newLine() Specify that a new line has been started.
void	setIndentation(int n) Set the amount of indentation space for each level.

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Field Detail

lineStart

protected boolean lineStart

true if we are at the start of a line in the generated output.

currentLine

protected int currentLine

The current line number in the generated output.

numIndent

protected int numIndent

Number of indentation levels - used to record the amount of identatation.

spaces

protected int spaces

The amount of indentation spaces per indentation level.

currentColumn

protected int currentColumn

The current output column.

Constructor Detail

Emit

public Emit(int indent)

Create a class to use in writing out generated code.

Parameters:

indent - is the number of spaces to indent

Emit

public Emit(int currentLine,
            int currentColumn,
            int indent)

Create a class to use in writing out generated code.

Parameters:

currentLine - is the current output line number

currentColumn - is the current output column number

indent - is the number of spaces to indent

Method Detail

emit

public abstract void emit(java.lang.String s)

Print a string to the output. If we are at the beginning of a line, then generate some indentation.

emit

public abstract void emit(int n)

Print an integer to the output. If we are at the beginning of a line, then generate some indentation.

emit

public abstract void emit(long n)

Print a long to the output. If we are at the beginning of a line, then generate some indentation.

emit

public abstract void emit(char c)

Print a character to the output. If we are at the beginning of a line, then generate some indentation.

endLine

public void endLine()

Signal the end of the current line and start a new one.

indent

protected void indent()

Add indentation to output

newLine

protected void newLine()

Specify that a new line has been started.

incIndLevel

public void incIndLevel()

Increment the number of spaces to indent

decIndLevel

public void decIndLevel()

Decrease the amount of space for indentation

setIndentation

public void setIndentation(int n)

Set the amount of indentation space for each level.

getCurrentLine

public int getCurrentLine()

Return the current line number of the line being generated.

getCurrentColumn

public int getCurrentColumn()

Return the current output column.