org.extex.ocpware.compiler.arith
Class Constant

java.lang.Object
  org.extex.ocpware.compiler.arith.ArithExpr
      org.extex.ocpware.compiler.arith.Constant

All Implemented Interfaces:

Left, Expr

public class Constant
extends ArithExpr
implements Expr, Left

This class provides a constant arithmetic expression. It holds a number.

Version:

$Revision:6007 $

Author:

Gerd Neugebauer

Constructor Summary

Constant(int n)
Creates a new object.

Method Summary

java.util.List<java.lang.Integer>	genLeft(State state, CompilerState cs) Compile the left item and add the appropriate instructions to the state.
void	outRight(CompilerState cs, boolean withOffset) Compile the string expression into a set of ΩCP instructions.
java.lang.String	toString()

Methods inherited from class org.extex.ocpware.compiler.arith.ArithExpr

needsParen, parse, toString

Methods inherited from class java.lang.Object

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

Constructor Detail

Constant

public Constant(int n)

Creates a new object.

Parameters:

n - the value

Method Detail

genLeft

public java.util.List<java.lang.Integer> genLeft(State state,
                                                 CompilerState cs)
                                          throws ArgmentTooBigException,
                                                 java.io.IOException,
                                                 IllegalOpcodeException

Compile the left item and add the appropriate instructions to the state. As a result a list of indices into the code is returned which should need to be fixed. This fix inserts the position of the code into the places given. Thus it is possible to put destinations for goto statements into the holes.

Specified by:

genLeft in interface Left

Parameters:

state - the current state

cs - the compiler state

Returns:

the list of instructions to fix

Throws:

ArgmentTooBigException - in case that an argument is encountered which does not fit into two bytes

AliasNotDefinedException - in case that no matching alias is known for a symbolic table reference

java.io.IOException - in case of an I/O error

IllegalOpcodeException - in case of an illegal op code

See Also:

Left.genLeft( org.extex.ocpware.compiler.parser.State, CompilerState)

outRight

public void outRight(CompilerState cs,
                     boolean withOffset)
              throws java.io.IOException,
                     ArgmentTooBigException

Compile the string expression into a set of ΩCP instructions.

Specified by:

outRight in interface Expr

Parameters:

cs - the compiler state for lookup

withOffset - use push back instead of output

Throws:

java.io.IOException - in case of an I/O error

TableNotDefinedException - in case that no matching table is known for a symbolic table reference

ArgmentTooBigException - in case that an argument is encountered which does not fit into two bytes

See Also:

Expr.outRight( org.extex.ocpware.compiler.parser.CompilerState, boolean)

toString

public java.lang.String toString()

Overrides:

toString in class java.lang.Object

See Also:

Object.toString()