org.lsmp.djep.matrixJep.MatrixPreprocessor Maven / Gradle / Ivy
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JEP is a Java library for parsing and evaluating mathematical expressions.
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/* @author rich
* Created on 30-Oct-2003
*/
package org.lsmp.djep.matrixJep;
import org.nfunk.jep.*;
import org.nfunk.jep.function.*;
import org.lsmp.djep.djep.*;
import org.lsmp.djep.xjep.*;
import org.lsmp.djep.matrixJep.nodeTypes.*;
import org.lsmp.djep.vectorJep.*;
import org.lsmp.djep.vectorJep.function.*;
/**
* 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
*/
public class MatrixPreprocessor implements ParserVisitor
{
private MatrixJep mjep;
private MatrixNodeFactory nf;
private DSymbolTable vt;
public MatrixPreprocessor() {}
/**
* Main entry point: pre-process a node.
* @param node Top node of tree.
* @param mdjep Reference to MatrixJep instance
* @return A new tree with all preprocessing carried out.
* @throws ParseException
*/
public MatrixNodeI preprocess(Node node,MatrixJep mdjep) throws ParseException
{
this.mjep=mdjep;
this.nf=(MatrixNodeFactory) mdjep.getNodeFactory();
this.vt=(DSymbolTable) mdjep.getSymbolTable();
return (MatrixNodeI) node.jjtAccept(this,null);
}
/**
* Returns an array of matrix nodes which are the results of visiting each child.
*/
public MatrixNodeI[] visitChildrenAsArray(Node node,Object data) throws ParseException
{
int nchild = node.jjtGetNumChildren();
MatrixNodeI children[] = new MatrixNodeI[nchild];
for(int i=0;i