Package com.singularsys.extensions.djep

Class DPrintVisitor

java.lang.Object

com.singularsys.jep.PrintVisitor

com.singularsys.extensions.djep.DPrintVisitor

All Implemented Interfaces:

JepComponent, ParserVisitor, Serializable

public class DPrintVisitor
extends PrintVisitor

An extension of PrintVisitor which will print the equations of a variable if required. The behaviours of this class is determined by two modes PRINT_PARTIAL_EQNS and PRINT_VARIABLE_EQNS. When a variable or partial derivative is encountered then its equation may be printed. By default equations for PartialDerivatives are printed but equations for normal derivatives are not. TODO might want to print eqn for y=sin(x) but not x=3

Author:

Rich Morris Created on 26-Feb-2004

See Also:

• Serialized Form

Nested Class Summary

Nested classes/interfaces inherited from class com.singularsys.jep.PrintVisitor

PrintVisitor.NullPrintVisitor, PrintVisitor.PrintRulesI, PrintVisitor.StdElePrintRule, PrintVisitor.StdListPrintRule

Field Summary

Fields

Modifier and Type	Field	Description
static final int	PRINT_PARTIAL_EQNS
static final int	PRINT_VARIABLE_EQNS

Fields inherited from class com.singularsys.jep.PrintVisitor

COMPLEX_I, format, fp, FULL_BRACKET, FunctionArgSep, FunLBracket, FunRBracket, LBracket, mode, NULL_PRINT_VISITOR, ot, RBracket, sb, specialFunRules, specialRules, specialVarName

Constructor Summary

Constructors

Constructor	Description
DPrintVisitor()

Method Summary

Modifier and Type	Method	Description
boolean	testLeft(Operator top, Node lhs)	Test if brackets are necessary around left-hand side.
boolean	testMid(Operator top, Node rhs)	Test if brackets are needed around a middle argument x + (y) + z
boolean	testRight(Operator top, Node rhs)	Tests if brackets are necessary around the RHS child of an operator.
Object	visit(ASTVarNode node, Object data)	Prints the variable or its equation.

Methods inherited from class com.singularsys.jep.PrintVisitor

addSpecialRule, addSpecialRule, addSpecialVarName, append, formatValue, formatValue, getFunArgSep, getFunLBracket, getFunRBracket, getLBracket, getLightWeightInstance, getMaxLen, getMode, getMode, getRBracket, getSpecialFunRule, getSpecialRule, getSpecialVarName, init, print, print, printBrackets, println, println, printNoBrackets, printWrap, setFunArgSep, setFunLBracket, setFunRBracket, setLBracket, setMaxLen, setMode, setNumberFormat, setRBracket, toString, visit, visit, visit, visit, visitBinary, visitNaryBinary, visitUnary

Methods inherited from class java.lang.Object

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

Field Details

PRINT_PARTIAL_EQNS

public static final int PRINT_PARTIAL_EQNS

See Also:

• Constant Field Values

PRINT_VARIABLE_EQNS

public static final int PRINT_VARIABLE_EQNS

See Also:

• Constant Field Values

Constructor Details

DPrintVisitor

public DPrintVisitor()

Method Details

visit

public Object visit(ASTVarNode node,
 Object data)
             throws JepException

Prints the variable or its equation. Depends on the state of the flags and whether the variable has an equation.

Specified by:

visit in interface ParserVisitor

Overrides:

visit in class PrintVisitor

Throws:

JepException

testLeft

public boolean testLeft(Operator top,
 Node lhs)

Description copied from class: PrintVisitor

Test if brackets are necessary around left-hand side.

Overrides:

testLeft in class PrintVisitor

Parameters:

top - The current operator being printed.

lhs - The node on the left-hand side.

Returns:

True if a bracket is necessary, false otherwise.

testMid

public boolean testMid(Operator top,
 Node rhs)

Description copied from class: PrintVisitor

Test if brackets are needed around a middle argument x + (y) + z

Overrides:

testMid in class PrintVisitor

Parameters:

top - The current operator being printed.

rhs - The node in the middle of a chain.

Returns:

True if a bracket is necessary, false otherwise.

testRight

public boolean testRight(Operator top,
 Node rhs)

Description copied from class: PrintVisitor

Tests if brackets are necessary around the RHS child of an operator.

Overrides:

testRight in class PrintVisitor

Parameters:

top - The operator.

rhs - The right hand side node.

Returns:

True if brackets are necessary, false otherwise.