org.lsmp.djep.matrixJep

Class MatrixPreprocessor

java.lang.Object

org.lsmp.djep.matrixJep.MatrixPreprocessor

All Implemented Interfaces:

ParserVisitor

public class MatrixPreprocessor
extends Object
implements ParserVisitor

This visitor does the majority of preprocessing work. Specifically it

• Sets the dimension of each node.
• For assignment equations it adds an entry in the VariableTable
• For diff opperator it calculates the derivative.
• For the List opperator it finds the dimensions and returns a ASTTensor.
• For the Hat opperator it finds the dimension and returns a Power or Wedge opperator.

The visitor will return a new Tree.

Author:

Rich Morris Created on 30-Oct-2003

Constructor Summary

Constructors

Constructor and Description
MatrixPreprocessor()

Method Summary

Modifier and Type	Method and Description
MatrixNodeI	preprocess(Node node, MatrixJep mdjep) Main entry point: pre-process a node.
Object	visit(ASTConstant node, Object data) constants
Object	visit(ASTFunNode node, Object data) visit functions and operators
Object	visit(ASTStart node, Object data)
Object	visit(ASTVarNode node, Object data) multi-dimensional differentiable variables
Object	visit(SimpleNode node, Object data)
MatrixNodeI[]	visitChildrenAsArray(Node node, Object data) Returns an array of matrix nodes which are the results of visiting each child.
Object	visitOp(ASTFunNode node, Object data) operators +,-,*,/

Methods inherited from class java.lang.Object

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

Constructor Detail

MatrixPreprocessor

public MatrixPreprocessor()

Method Detail

preprocess

public MatrixNodeI preprocess(Node node,
                              MatrixJep mdjep)
                       throws ParseException

Main entry point: pre-process a node.

Parameters:

node - Top node of tree.

mdjep - Reference to MatrixJep instance

Returns:

A new tree with all preprocessing carried out.

Throws:

ParseException

visitChildrenAsArray

public MatrixNodeI[] visitChildrenAsArray(Node node,
                                          Object data)
                                   throws ParseException

Returns an array of matrix nodes which are the results of visiting each child.

Throws:

ParseException

visit

public Object visit(SimpleNode node,
                    Object data)

Specified by:

visit in interface ParserVisitor

visit

public Object visit(ASTStart node,
                    Object data)

Specified by:

visit in interface ParserVisitor

visit

public Object visit(ASTConstant node,
                    Object data)
             throws ParseException

constants

Specified by:

visit in interface ParserVisitor

Throws:

ParseException

visit

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

multi-dimensional differentiable variables

Specified by:

visit in interface ParserVisitor

Throws:

ParseException

visit

public Object visit(ASTFunNode node,
                    Object data)
             throws ParseException

visit functions and operators

Specified by:

visit in interface ParserVisitor

Throws:

ParseException

visitOp

public Object visitOp(ASTFunNode node,
                      Object data)
               throws ParseException

operators +,-,*,/

Throws:

ParseException