vtkFunctionParser.h

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/*=========================================================================

  Program:   Visualization Toolkit
  Module:    $RCSfile: vtkFunctionParser.h,v $

  Copyright (c) Ken Martin, Will Schroeder, Bill Lorensen
  All rights reserved.
  See Copyright.txt or http://www.kitware.com/Copyright.htm for details.

     This software is distributed WITHOUT ANY WARRANTY; without even
     the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR
     PURPOSE.  See the above copyright notice for more information.

=========================================================================*/
#ifndef __vtkFunctionParser_h
#define __vtkFunctionParser_h

#include "vtkObject.h"

#define VTK_PARSER_IMMEDIATE 1
#define VTK_PARSER_UNARY_MINUS 2

// supported math functions
#define VTK_PARSER_ADD 3
#define VTK_PARSER_SUBTRACT 4
#define VTK_PARSER_MULTIPLY 5
#define VTK_PARSER_DIVIDE 6
#define VTK_PARSER_POWER 7
#define VTK_PARSER_ABSOLUTE_VALUE 8
#define VTK_PARSER_EXPONENT 9
#define VTK_PARSER_CEILING 10
#define VTK_PARSER_FLOOR 11
#define VTK_PARSER_LOGARITHM 12
#define VTK_PARSER_SQUARE_ROOT 13
#define VTK_PARSER_SINE 14
#define VTK_PARSER_COSINE 15
#define VTK_PARSER_TANGENT 16
#define VTK_PARSER_ARCSINE 17
#define VTK_PARSER_ARCCOSINE 18
#define VTK_PARSER_ARCTANGENT 19
#define VTK_PARSER_HYPERBOLIC_SINE 20
#define VTK_PARSER_HYPERBOLIC_COSINE 21
#define VTK_PARSER_HYPERBOLIC_TANGENT 22
#define VTK_PARSER_MIN 23
#define VTK_PARSER_MAX 24
#define VTK_PARSER_SIGN 25

// functions involving vectors
#define VTK_PARSER_VECTOR_UNARY_MINUS 26
#define VTK_PARSER_DOT_PRODUCT 27
#define VTK_PARSER_VECTOR_ADD 28
#define VTK_PARSER_VECTOR_SUBTRACT 29
#define VTK_PARSER_SCALAR_TIMES_VECTOR 30
#define VTK_PARSER_VECTOR_TIMES_SCALAR 31
#define VTK_PARSER_MAGNITUDE 32
#define VTK_PARSER_NORMALIZE 33

// constants involving vectors
#define VTK_PARSER_IHAT 34
#define VTK_PARSER_JHAT 35
#define VTK_PARSER_KHAT 36

// codes for scalar variables come before those for vectors
#define VTK_PARSER_BEGIN_VARIABLES 37

// the value that is retuned as a result if there is an error
#define VTK_PARSER_ERROR_RESULT VTK_LARGE_FLOAT

class VTK_COMMON_EXPORT vtkFunctionParser : public vtkObject
{
public:
  static vtkFunctionParser *New();
  vtkTypeRevisionMacro(vtkFunctionParser, vtkObject);
  void PrintSelf(ostream& os, vtkIndent indent);
  

  void SetFunction(const char *function);
  vtkGetStringMacro(Function);

  int IsScalarResult();

  int IsVectorResult();

  double GetScalarResult();


  double* GetVectorResult();
  void GetVectorResult(double result[3]) {
    double *r = this->GetVectorResult();
    result[0] = r[0]; result[1] = r[1]; result[2] = r[2]; };


  void SetScalarVariableValue(const char* variableName, double value);
  void SetScalarVariableValue(int i, double value);


  double GetScalarVariableValue(const char* variableName);
  double GetScalarVariableValue(int i);


  void SetVectorVariableValue(const char* variableName, double xValue,
                              double yValue, double zValue);
  void SetVectorVariableValue(const char* variableName, 
                              const double values[3]) {
    this->SetVectorVariableValue(variableName,values[0],values[1],values[2]);};
  void SetVectorVariableValue(int i, double xValue, double yValue,
                              double zValue);
  void SetVectorVariableValue(int i, const double values[3]) {
    this->SetVectorVariableValue(i,values[0],values[1],values[2]);};
  

  double* GetVectorVariableValue(const char* variableName);
  void GetVectorVariableValue(const char* variableName, double value[3]) {
    double *r = this->GetVectorVariableValue(variableName);
    value[0] = r[0]; value[1] = r[1]; value[2] = r[2]; };
  double* GetVectorVariableValue(int i);
  void GetVectorVariableValue(int i, double value[3]) {
    double *r = this->GetVectorVariableValue(i);
    value[0] = r[0]; value[1] = r[1]; value[2] = r[2]; };
  

  vtkGetMacro(NumberOfScalarVariables,int);


  vtkGetMacro(NumberOfVectorVariables,int);

  char* GetScalarVariableName(int i);
  
  char* GetVectorVariableName(int i);

  void RemoveAllVariables();
  
protected:
  vtkFunctionParser();
  ~vtkFunctionParser();
  
  int Parse();
  void Evaluate();

  int CheckSyntax();
  void RemoveSpaces();
  char* RemoveSpacesFrom(const char* variableName);
  int OperatorWithinVariable(int idx);
  
  int BuildInternalFunctionStructure();
  void BuildInternalSubstringStructure(int beginIndex, int endIndex);
  void AddInternalByte(unsigned char newByte);
  
  int IsSubstringCompletelyEnclosed(int beginIndex, int endIndex);
  int FindEndOfMathFunction(int beginIndex);
  int FindEndOfMathConstant(int beginIndex);
  
  int IsVariableName(int currentIndex);
  int IsElementaryOperator(int op);
  
  int GetMathFunctionNumber(int currentIndex);
  int GetMathFunctionStringLength(int mathFunctionNumber);
  int GetMathConstantNumber(int currentIndex);
  int GetMathConstantStringLength(int mathConstantNumber);
  int GetElementaryOperatorNumber(char op);
  int GetOperandNumber(int currentIndex);
  int GetVariableNameLength(int variableNumber);
  
  int DisambiguateOperators();
  
  char* Function;
  int FunctionLength;
  int NumberOfScalarVariables;
  int NumberOfVectorVariables;
  char** ScalarVariableNames;
  char** VectorVariableNames;
  double* ScalarVariableValues;
  double** VectorVariableValues;
  unsigned char *ByteCode;
  int ByteCodeSize;
  double *Immediates;
  int ImmediatesSize;
  double *Stack;
  int StackSize;
  int StackPointer;

  vtkTimeStamp FunctionMTime;
  vtkTimeStamp ParseMTime;
  vtkTimeStamp VariableMTime;
  vtkTimeStamp EvaluateMTime;
private:
  vtkFunctionParser(const vtkFunctionParser&);  // Not implemented.
  void operator=(const vtkFunctionParser&);  // Not implemented.
};

#endif

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