vtkFunctionParser.h

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// SPDX-FileCopyrightText: Copyright (c) Ken Martin, Will Schroeder, Bill Lorensen
// SPDX-License-Identifier: BSD-3-Clause
 
#ifndef vtkFunctionParser_h
#define vtkFunctionParser_h
 
#include "vtkCommonMiscModule.h" // For export macro
#include "vtkObject.h"
#include "vtkTuple.h" // needed for vtkTuple
#include <string>     // needed for string.
#include <vector>     // needed for vector
 
#define VTK_PARSER_IMMEDIATE 1
#define VTK_PARSER_UNARY_MINUS 2
#define VTK_PARSER_UNARY_PLUS 3
 
// supported math functions
#define VTK_PARSER_ADD 4
#define VTK_PARSER_SUBTRACT 5
#define VTK_PARSER_MULTIPLY 6
#define VTK_PARSER_DIVIDE 7
#define VTK_PARSER_POWER 8
#define VTK_PARSER_ABSOLUTE_VALUE 9
#define VTK_PARSER_EXPONENT 10
#define VTK_PARSER_CEILING 11
#define VTK_PARSER_FLOOR 12
#define VTK_PARSER_LOGARITHM 13
#define VTK_PARSER_LOGARITHME 14
#define VTK_PARSER_LOGARITHM10 15
#define VTK_PARSER_SQUARE_ROOT 16
#define VTK_PARSER_SINE 17
#define VTK_PARSER_COSINE 18
#define VTK_PARSER_TANGENT 19
#define VTK_PARSER_ARCSINE 20
#define VTK_PARSER_ARCCOSINE 21
#define VTK_PARSER_ARCTANGENT 22
#define VTK_PARSER_HYPERBOLIC_SINE 23
#define VTK_PARSER_HYPERBOLIC_COSINE 24
#define VTK_PARSER_HYPERBOLIC_TANGENT 25
#define VTK_PARSER_MIN 26
#define VTK_PARSER_MAX 27
#define VTK_PARSER_SIGN 29
 
// functions involving vectors
#define VTK_PARSER_CROSS 28
#define VTK_PARSER_VECTOR_UNARY_MINUS 30
#define VTK_PARSER_VECTOR_UNARY_PLUS 31
#define VTK_PARSER_DOT_PRODUCT 32
#define VTK_PARSER_VECTOR_ADD 33
#define VTK_PARSER_VECTOR_SUBTRACT 34
#define VTK_PARSER_SCALAR_TIMES_VECTOR 35
#define VTK_PARSER_VECTOR_TIMES_SCALAR 36
#define VTK_PARSER_VECTOR_OVER_SCALAR 37
#define VTK_PARSER_MAGNITUDE 38
#define VTK_PARSER_NORMALIZE 39
 
// constants involving vectors
#define VTK_PARSER_IHAT 40
#define VTK_PARSER_JHAT 41
#define VTK_PARSER_KHAT 42
 
// code for if(bool, trueval, falseval) resulting in a scalar
#define VTK_PARSER_IF 43
 
// code for if(bool, truevec, falsevec) resulting in a vector
#define VTK_PARSER_VECTOR_IF 44
 
// codes for boolean expressions
#define VTK_PARSER_LESS_THAN 45
 
// codes for boolean expressions
#define VTK_PARSER_GREATER_THAN 46
 
// codes for boolean expressions
#define VTK_PARSER_EQUAL_TO 47
 
// codes for boolean expressions
#define VTK_PARSER_AND 48
 
// codes for boolean expressions
#define VTK_PARSER_OR 49
 
// codes for scalar variables come before those for vectors. Do not define
// values for VTK_PARSER_BEGIN_VARIABLES+1, VTK_PARSER_BEGIN_VARIABLES+2, ...,
// because they are used to look up variables numbered 1, 2, ...
#define VTK_PARSER_BEGIN_VARIABLES 50
 
// the value that is returned as a result if there is an error
#define VTK_PARSER_ERROR_RESULT VTK_FLOAT_MAX
 
VTK_ABI_NAMESPACE_BEGIN
class VTKCOMMONMISC_EXPORT vtkFunctionParser : public vtkObject
{
public:
  static vtkFunctionParser* New();
  vtkTypeMacro(vtkFunctionParser, vtkObject);
  void PrintSelf(ostream& os, vtkIndent indent) override;

  vtkMTimeType GetMTime() override;
 
  int GetResultSize() { return 3; }


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

  int IsScalarResult();

  int IsVectorResult();

  double GetScalarResult();


  double* GetVectorResult() VTK_SIZEHINT(3);
  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(const std::string& variableName, double value)
  {
    this->SetScalarVariableValue(variableName.c_str(), value);
  }
  void SetScalarVariableValue(int i, double value);


  double GetScalarVariableValue(const char* variableName);
  double GetScalarVariableValue(const std::string& variableName)
  {
    return this->GetScalarVariableValue(variableName.c_str());
  }
  double GetScalarVariableValue(int i);


  void SetVectorVariableValue(
    const char* variableName, double xValue, double yValue, double zValue);
  void SetVectorVariableValue(
    const std::string& variableName, double xValue, double yValue, double zValue)
  {
    this->SetVectorVariableValue(variableName.c_str(), xValue, yValue, zValue);
  }
  void SetVectorVariableValue(const char* variableName, const double* values, int vtkNotUsed(size))
  {
    this->SetVectorVariableValue(variableName, values[0], values[1], values[2]);
  }
  void SetVectorVariableValue(
    const std::string& variableName, const double* values, int vtkNotUsed(size))
  {
    this->SetVectorVariableValue(variableName.c_str(), values[0], values[1], values[2]);
  }
  void SetVectorVariableValue(int i, double xValue, double yValue, double zValue);
  void SetVectorVariableValue(int i, const double* values, int vtkNotUsed(size))
  {
    this->SetVectorVariableValue(i, values[0], values[1], values[2]);
  }



  double* GetVectorVariableValue(const char* variableName) VTK_SIZEHINT(3);
  double* GetVectorVariableValue(const std::string& variableName) VTK_SIZEHINT(3)
  {
    return this->GetVectorVariableValue(variableName.c_str());
  }
  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];
  }
  void GetVectorVariableValue(const std::string& variableName, double value[3])
  {
    this->GetVectorVariableValue(variableName.c_str(), value);
  }
  double* GetVectorVariableValue(int i) VTK_SIZEHINT(3);
  void GetVectorVariableValue(int i, double value[3])
  {
    double* r = this->GetVectorVariableValue(i);
    value[0] = r[0];
    value[1] = r[1];
    value[2] = r[2];
  }


  int GetNumberOfScalarVariables() { return static_cast<int>(this->ScalarVariableNames.size()); }

  int GetScalarVariableIndex(const char* name);
  int GetScalarVariableIndex(const std::string& name)
  {
    return this->GetScalarVariableIndex(name.c_str());
  }

  int GetNumberOfVectorVariables() { return static_cast<int>(this->VectorVariableNames.size()); }

  int GetVectorVariableIndex(const char* name);
  int GetVectorVariableIndex(const std::string& name)
  {
    return this->GetVectorVariableIndex(name.c_str());
  }

  const char* GetScalarVariableName(int i);

  const char* GetVectorVariableName(int i);


  bool GetScalarVariableNeeded(int i);
  bool GetScalarVariableNeeded(const char* variableName);
  bool GetScalarVariableNeeded(const std::string& variableName)
  {
    return GetScalarVariableNeeded(variableName.c_str());
  }



  bool GetVectorVariableNeeded(int i);
  bool GetVectorVariableNeeded(const char* variableName);
  bool GetVectorVariableNeeded(const std::string& variableName)
  {
    return this->GetVectorVariableNeeded(variableName.c_str());
  }


  void RemoveAllVariables();

  void RemoveScalarVariables();

  void RemoveVectorVariables();


  vtkSetMacro(ReplaceInvalidValues, vtkTypeBool);
  vtkGetMacro(ReplaceInvalidValues, vtkTypeBool);
  vtkBooleanMacro(ReplaceInvalidValues, vtkTypeBool);
  vtkSetMacro(ReplacementValue, double);
  vtkGetMacro(ReplacementValue, double);

  void CheckExpression(int& pos, char** error);

  void InvalidateFunction();
 
protected:
  vtkFunctionParser();
  ~vtkFunctionParser() override;
 
  int Parse();

  bool Evaluate();
 
  int CheckSyntax();
 
  void CopyParseError(int& position, char** error);
 
  void RemoveSpaces();
  char* RemoveSpacesFrom(const char* variableName);
  int OperatorWithinVariable(int idx);
 
  int BuildInternalFunctionStructure();
  void BuildInternalSubstringStructure(int beginIndex, int endIndex);
  void AddInternalByte(unsigned int 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 GetMathFunctionNumberByCheckingParenthesis(int currentIndex);
  int GetMathFunctionStringLength(int mathFunctionNumber);
  int GetMathConstantNumber(int currentIndex);
  int GetMathConstantStringLength(int mathConstantNumber);
  unsigned char GetElementaryOperatorNumber(char op);
  unsigned int GetOperandNumber(int currentIndex);
  int GetVariableNameLength(int variableNumber);
 
  int DisambiguateOperators();

  void UpdateNeededVariables();
 
  vtkSetStringMacro(ParseError);
 
  int FindPositionInOriginalFunction(const int& pos);
 
  char* Function;
  char* FunctionWithSpaces;
 
  int FunctionLength;
  std::vector<std::string> ScalarVariableNames;
  std::vector<std::string> VectorVariableNames;
  std::vector<double> ScalarVariableValues;
  std::vector<vtkTuple<double, 3>> VectorVariableValues;
  std::vector<bool> ScalarVariableNeeded;
  std::vector<bool> VectorVariableNeeded;
 
  std::vector<unsigned int> ByteCode;
  int ByteCodeSize;
  double* Immediates;
  int ImmediatesSize;
  double* Stack;
  int StackSize;
  int StackPointer;
 
  vtkTimeStamp FunctionMTime;
  vtkTimeStamp ParseMTime;
  vtkTimeStamp CheckMTime;
 
  vtkTypeBool ReplaceInvalidValues;
  double ReplacementValue;
 
  int ParseErrorPositon;
  char* ParseError;
 
private:
  vtkFunctionParser(const vtkFunctionParser&) = delete;
  void operator=(const vtkFunctionParser&) = delete;
};
 
VTK_ABI_NAMESPACE_END
#endif