nl.bluering
Class Operator

java.lang.Object
  |
  +--nl.bluering.Operator

public class Operator

extends java.lang.Object

Field Summary

static int	IN the possible values of place
int	level the level of this Operator.
int	place the place of the Operator: pre,post, or infix.
static int	POST the possible values of place
static int	PRE the possible values of place

Method Summary

static boolean	aoverb(Operator a, Operator b)
static boolean	aunderb(Operator a, Operator b)
static Operator	factory(java.lang.String n, java.lang.String type, int level, java.lang.String fname) this is the method to construct Operators.
boolean	fitsunder(int l) returns whether this Operator can be fitted under the given level.
int	leftlevel() returns the level that subexpression on the left must be smaller or equal to.
int	rightlevel() returns the level that subexpression on the right must be smaller or equal to.

Methods inherited from class java.lang.Object

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

Field Detail

place

public int place

the place of the Operator: pre,post, or infix.

level

public int level

the level of this Operator. Please do not set it, only read it.

PRE

public static int PRE

the possible values of place

IN

public static int IN

the possible values of place

POST

public static int POST

the possible values of place

Method Detail

aunderb

public static boolean aunderb(Operator a,
                              Operator b)

aoverb

public static boolean aoverb(Operator a,
                             Operator b)

fitsunder

public boolean fitsunder(int l)

returns whether this Operator can be fitted under the given level.

leftlevel

public int leftlevel()

returns the level that subexpression on the left must be smaller or equal to.

rightlevel

public int rightlevel()

returns the level that subexpression on the right must be smaller or equal to.

factory

public static Operator factory(java.lang.String n,
                               java.lang.String type,
                               int level,
                               java.lang.String fname)

this is the method to construct Operators.

Parameters:

n - the appearance of the Operator, for instance "+"

type - any of fx,fy(prefix Operator), xfy,yfx,xfx (infix Operator) or xf,yf (postfix Operator). An x indicates the the subargument at that side must have a strictly lower level than this, an y indicates it must have a lower or equal level. yfy is forbidden because it would lead to ambiguity.

level - the level of this Operator. Must be between 0 and 1200.