source: cpp/frams/genetics/fS/fS_general.h @ 1257

// This file is a part of Framsticks SDK.  http://www.framsticks.com/
// Copyright (C) 2019-2021  Maciej Komosinski and Szymon Ulatowski.
// See LICENSE.txt for details.

#ifndef _FS_GENERAL_H_
#define _FS_GENERAL_H_

#include <iostream>
#include <vector>
#include <map>
#include <unordered_map>
#include <exception>
#include <algorithm>
#include "frams/model/model.h"
#include "frams/util/multirange.h"

/** @name Values of constants used in encoding */
//@{
#define MODE_SEPARATOR ':'
#define BRANCH_START '('
#define BRANCH_END ')'
#define BRANCH_SEPARATOR ','
#define PARAM_START '{'
#define PARAM_END '}'
const char PARAM_SEPARATOR = ',';
const char PARAM_KEY_VALUE_SEPARATOR = '=';
#define NEURON_START '['
const char NEURON_END = ']';
const char NEURON_SEPARATOR = ';';
const SString NEURON_INTERNAL_SEPARATOR(",");
#define NEURON_I_W_SEPARATOR ':'
//@}

enum class SHIFT
{
        LEFT = -1,
        RIGHT = 1
};


/** @name Names of node parameters and modifiers*/
//@{
#define INGESTION "i"
#define FRICTION "f"
#define STIFFNESS "st"
#define SCALE "s"
#define SCALE_X "x"
#define SCALE_Y "y"
#define SCALE_Z "z"
#define ROT_X "tx"
#define ROT_Y "ty"
#define ROT_Z "tz"
#define RX "rx"
#define RY "ry"
#define RZ "rz"
//@}


#define HINGE_X 'b'
#define HINGE_XY 'c'

const double DEFAULT_NEURO_CONNECTION_WEIGHT = 1.0;

const char ELLIPSOID = 'E';
const char CUBOID = 'C';
const char CYLINDER = 'R';
const std::unordered_map<Part::Shape, char> SHAPE_TO_GENE = {
                {Part::Shape::SHAPE_ELLIPSOID, ELLIPSOID},
                {Part::Shape::SHAPE_CUBOID,    CUBOID},
                {Part::Shape::SHAPE_CYLINDER,  CYLINDER},
};

// This map is inverse to SHAPE_TO_SYMBOL. Those two should be compatible
const std::unordered_map<char, Part::Shape> GENE_TO_SHAPE = {
                {ELLIPSOID, Part::Shape::SHAPE_ELLIPSOID},
                {CUBOID,    Part::Shape::SHAPE_CUBOID},
                {CYLINDER,  Part::Shape::SHAPE_CYLINDER},
};
const int SHAPE_COUNT = 3;    // This should be the count of SHAPE_TO_GENE and GENE_TO_SHAPE

const char DEFAULT_JOINT = 'a';
const string JOINTS = "bc";
const string ALL_JOINTS = "abc";
const int JOINT_COUNT = (int)JOINTS.length();
const string MODIFIERS = "IFS";
const char SCALE_MODIFIER = 's';
const vector<string> PARAMS {INGESTION, FRICTION, ROT_X, ROT_Y, ROT_Z, RX, RY, RZ, SCALE, SCALE_X, SCALE_Y, SCALE_Z};
const vector<string> SCALE_PARAMS {SCALE, SCALE_X, SCALE_Y, SCALE_Z};

/** @name Default values of node parameters*/
const std::map<Part::Shape, double> volumeMultipliers = {
                {Part::Shape::SHAPE_CUBOID, 8.0},
                {Part::Shape::SHAPE_CYLINDER, 2.0 * M_PI},
                {Part::Shape::SHAPE_ELLIPSOID, (4.0 / 3.0) * M_PI},
};

/** @name Number of tries of performing a mutation before GENOPER_FAIL is returned */
#define mutationTries  20

class fS_Exception : public std::exception
{
        string msg;
public:

        int errorPosition;
        virtual const char *what() const throw()
        {
                return msg.c_str();
        }

        fS_Exception(string _msg, int _errorPosition)
        {
                msg = _msg;
                errorPosition = _errorPosition;
        }
};

/**
 * Draws an integer value from given range
 * @param to maximal value
 * @param from minimal value
 * @return Drawn value
 */
int randomFromRange(int to, int from);

/**
 * Represents a substring of a larger string.
 * The reference to the original string is stored along with indexes of beginning end length of the substring.
 */
class Substring
{
public:
        char *str;        // Pointer to the beginning of the substring
        int start;        // The beginning index of substring
        int len;        // The length of substring

        Substring(const char *_str, int _start, int _len)
        {
                str = (char *) _str + _start;
                start = _start;
                len = _len;
        }

        Substring(const Substring &other)
        {
                str = other.str;
                start = other.start;
                len = other.len;
        }

        const char *c_str()
        {
                return str;
        }

        SString substr(int relativeStart, int len)
        {
                const char *substrStart = str + relativeStart;
                return SString(substrStart, len);
        }

        int indexOf(char ch)
        {
                for (int i = 0; i < len; i++)
                        if (str[i] == ch)
                                return i;
                return -1;
        }

        void startFrom(int index)
        {
                str += index;
                start += index;
                len -= index;
        }

        void shortenBy(int charCount)
        {
                len = std::max(len - charCount, 0);
        }

        char at(int index)
        {
                return str[index];
        }

        /**
         * Create a new instance of multirange, corresponding to the substring
         * @return a created multirange
         */
        MultiRange toMultiRange()
        {
                int end = start + len - 1;
                return MultiRange(IRange(start, end));
        }
};

/**
 * Stores the state of the node.
 * The state consists od current location, the direction in which the branch develops
 * and the current default values of the parameters (default values can be changed by modifiers).
 */
class State
{
public:
        Pt3D location;  /// Location of the node
        Pt3D v;         /// The normalised vector in which current branch develops
        double fr = 1.0;      /// Friction multiplier
        double ing = 1.0;      /// Ingestion multiplier
        double s = 1.0;      /// Size multipliers

        State(State *_state); /// Derive the state from parent

        State(Pt3D _location, Pt3D _v); /// Create the state from parameters

        /**
         * Add the vector of specified length to location
         * @param length the length of the vector
         */
        void addVector(const double length);

        /**
         * Rotate the vector by specified values
         * @param rx rotation by x axis
         * @param ry rotation by y axis
         * @param rz rotation by z axis
         */
        void rotate(const Pt3D &rotation);
};

/**
 * Represent a neuron and its inputs
 */
class fS_Neuron: public Neuro
{
public:
        int start, end;
        std::map<int, double> inputs;

        fS_Neuron(const char *str, int start, int length);

        bool acceptsInputs()
        {
                return getClass()->prefinputs < int(inputs.size());
        }
};

struct GenotypeParams{
        double modifierMultiplier;      // Every modifier changes the underlying value by this multiplier
        /// When calculating the distance between parts, the internal result is a range of numbers
        /// distanceTolerance is the maximal allowed size of this range
        double distanceTolerance;
        /// Used for deriving density for MeshBuilder
        double relativeDensity;
        ///
        bool turnWithRotation;
        ///
        double paramMutationStrength;
};

/**
 * Represents a node in the graph that represents a genotype.
 * A node corresponds to a single part.
 * However, it also stores attributes that are specific to fS encoding, such as modifiers and joint types.
 */
class Node
{
        friend class fS_Genotype;

        friend class GenoOper_fS;

private:
        Substring *partDescription = nullptr;
        Node *parent;
        Part *part;     /// A part object built from node. Used in building the Model
        int partCodeLen; /// The length of substring that directly describes the corresponding part

        static std::map<string, double> minValues;      /// Min parameter values
        static std::map<string, double> defaultValues;  /// Default parameter values
        static std::map<string, double> maxValues;      /// Max parameter values

        vector<Node *> children;    /// Vector of all direct children
        std::map<char, int> modifiers;     /// Vector of all modifiers
        vector<fS_Neuron *> neurons;    /// Vector of all the neurons

        void prepareParams();

        void cleanUp();

        /// Get part's  rotation
        Pt3D getRotation();

        /// Get the rotation of vector
        Pt3D getVectorRotation();

        bool isPartScaleValid();

        /**
         * Get the position of part type in genotype
         *
         * @return the position of part type
         */
        int getPartPosition(Substring &restOfGenotype);

        /**
         * Extract modifiers from the rest of genotype
         * @return the remainder of the genotype
         */
        void extractModifiers(Substring &restOfGenotype);

        /**
         * Extract part type from the rest of genotype
         * @return the remainder of the genotype
         */
        void extractPartType(Substring &restOfGenotype);

        /**
         * Extract neurons from the rest of genotype
         * @return the remainder of the genotype
         */
        void extractNeurons(Substring &restOfGenotype);

        /**
         * Extract params from the rest of genotype
         * @return the length og the remainder of the genotype
         */
        void extractParams(Substring &restOfGenotype);

        /**
         * Extract child branches from the rest of genotype
         * @return vector of child branches
         */
        vector<Substring> getBranches(Substring &restOfGenotype);

        /**
         * Get phenotypic state that derives from ancestors.
         * Used when building model
         * @param _state state of the parent
         */
        void getState(State *_state, bool calculateLocation);

        /**
         * Build children internal representations from fS genotype
         * @param restOfGenotype part of genotype that describes the subtree
         */
        void getChildren(Substring &restOfGenotype);

        /**
         * Create part object from internal representation
         */
        void createPart();

        /**
         * Add joints between current node and the specified child
         * Used in building model
         * @param mode pointer to build model
         * @param child pointer to the child
         */
        void addJointsToModel(Model &model, Node *parent);

        /**
         * Get all the nodes from the subtree that starts in this node
         * @param reference to vector which contains nodes
         */
        void getAllNodes(vector<Node *> &allNodes);


        /**
         * Build model from the subtree that starts in this node
         * @param pointer to model
         */
        void buildModel(Model &model, Node *parent);

public:
        char joint = DEFAULT_JOINT;           /// Set of all joints
        Part::Shape partShape;  /// The type of the part
        State *state = nullptr; /// The phenotypic state that inherits from ancestors
        std::map<string, double> params; /// The map of all the node params
        GenotypeParams genotypeParams; /// Parameters that affect the whole genotype

        Node(Substring &genotype, Node *parent, GenotypeParams genotypeParams);

        ~Node();

        /**
         * Get fS representation of the subtree that starts from this node
         * @param result the reference to an object which is used to contain fS genotype
         */
        void getGeno(SString &result);

        /**
         * Calculate the effective scale of the part (after applying all multipliers and params)
         * @return The effective scales
         */
        void calculateScale(Pt3D &scale);

        /**
         * Calculate the effective volume of the part
         * @return The effective volume
         */
        double calculateVolume();

        /**
         * Counts all the nodes in subtree
         * @return node count
         */
        int getNodeCount();

        /**
         * Extract the value of parameter or return default if parameter not exists
         * @return the param value
         */
        double getParam(const string &key);
        double getParam(const string &key, double defaultValue);

        /// Calculate distance between the part its parent
        double calculateDistanceFromParent();
};

/**
 * Represents an fS genotype.
 */
class fS_Genotype
{
        friend class Node;

        friend class GenoOper_fS;

private:
        /**
         * Draws a node that has an index greater that specified
         * @param fromIndex minimal index of the node
         * @return pointer to drawn node
         */
        Node *chooseNode(int fromIndex=0);

        /**
         * Draws a value from defined distribution
         * @return Drawn value
         */
        void randomFromDistribution();

        /**
         * Find a node that is nearest (euclidean distance to specified node) and is not a child of specified node
         * @return Nearest node
         */
        Node *getNearestNode(vector<Node *> allNodes, Node *node);

public:
        Node *startNode = nullptr;    /// The start (root) node. All other nodes are its descendants


        static int precision; /// Number of decimal places for numbers in genotype

        /**
         * Build internal representation from fS format
         * @param genotype in fS format
         */
        fS_Genotype(const string &genotype);

        ~fS_Genotype();

        /// Calculate the State field for all the nodes
        void getState(bool calculateLocation);

        /**
         * Get all existing nodes
         * @return vector of all nodes
         */
        vector<Node *> getAllNodes();

        /**
         * Get all the neurons from the subtree that starts in given node
         * @param node The beginning of subtree
         * @return The vector of neurons
         */
        static vector<fS_Neuron *> extractNeurons(Node *node);

        /**
         * Get the index of the neuron in vector of neurons
         * @param neurons
         * @param changedNeuron
         * @return
         */
        static int getNeuronIndex(vector<fS_Neuron *> neurons, fS_Neuron *changedNeuron);

        /**
         * Left- or right- shift the indexes of neuro connections by the given range
         * @param neurons
         * @param start The beginning of the range
         * @param end The end of the range
         * @param shift
         */
        static void shiftNeuroConnections(vector<fS_Neuron *> &neurons, int start, int end, SHIFT shift);

        /**
         * Get all existing neurons
         * @return vector of all neurons
         */
        vector<fS_Neuron *> getAllNeurons();

        /**
         * Counts all the nodes in genotype
         * @return node count
         */
        int getNodeCount();

        /**
         * Check if scales of all parts in genotype are valid
        \retval error_position 1-based
        \retval 0 when all part sizes are valid
         */
        int checkValidityOfPartSizes();

        void validateNeuroInputs();

        /**
         * Builds Model object from internal representation
         * @param a reference to a model that will contain a built model
         */
        Model buildModel(bool using_checkpoints);

        /**
         * Adds neuro connections to model
         * @param a reference to a model where the connections will be added
         */
        void buildNeuroConnections(Model &model);

        /**
         * @return genotype in fS format
         */
        SString getGeno();

        /**
         * After creating or deleting a new neuron, rearrange other neurons so that the inputs match
         */
        void rearrangeNeuronConnections(fS_Neuron *newNeuron, SHIFT shift);

};


#endif