Source

Coin / src / engines / evaluator.h

Lars J. Aas 5bc842f 


Morten Eriksen e1aab25 
Marius Kintel 3ba6b41 




























Morten Eriksen e1aab25 

Lars J. Aas 5bc842f 



Morten Eriksen 64258fd 
Morten Eriksen e1aab25 





















Morten Eriksen 64258fd 



Morten Eriksen e1aab25 

Morten Eriksen 64258fd 

Morten Eriksen e1aab25 


Morten Eriksen 64258fd 
Morten Eriksen e1aab25 



Morten Eriksen 64258fd 
Morten Eriksen e1aab25 





Morten Eriksen 64258fd 







Morten Eriksen e1aab25 
Morten Eriksen 64258fd 
Morten Eriksen e1aab25 



Morten Eriksen dacfd2d 
Morten Eriksen 64258fd 



Morten Eriksen e1aab25 
Morten Eriksen 64258fd 



Morten Eriksen e1aab25 
Morten Eriksen 64258fd 






















































Morten Eriksen e1aab25 


Morten Eriksen 64258fd 








Morten Eriksen 5f564a0 
Morten Eriksen 64258fd 





Morten Eriksen e1aab25 
Morten Eriksen 64258fd 

Morten Eriksen e1aab25 
Morten Eriksen 64258fd 



Morten Eriksen e1aab25 

Morten Eriksen 64258fd 



#ifndef COIN_EVALUATOR_H
#define COIN_EVALUATOR_H

/**************************************************************************\
 * Copyright (c) Kongsberg Oil & Gas Technologies AS
 * All rights reserved.
 * 
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions are
 * met:
 * 
 * Redistributions of source code must retain the above copyright notice,
 * this list of conditions and the following disclaimer.
 * 
 * Redistributions in binary form must reproduce the above copyright
 * notice, this list of conditions and the following disclaimer in the
 * documentation and/or other materials provided with the distribution.
 * 
 * Neither the name of the copyright holder nor the names of its
 * contributors may be used to endorse or promote products derived from
 * this software without specific prior written permission.
 * 
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
 * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
 * HOLDER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
 * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
\**************************************************************************/

#ifndef COIN_INTERNAL
#error this is a private header file
#endif /* !COIN_INTERNAL */


/*
 * expression parser/evaluator for SoCalculator expressions.
 *
 * I chose to implement this "module" in pure C, since I think
 * mixing flex/bison code and C++ is a bad idea.
 *
 * The bison parser builds a tree structure which is traversed
 * each time the expression needs to be evaluated. I guess
 * the inputs will change more often than the expression, so I
 * think this is better than parsing the expression every time.
 *
 * Call so_eval_parse() to build the tree structure. This method
 * returns NULL if an error occured. The actual error message
 * can be found by using so_eval_error().
 *
 * Call so_eval_evaluate() to evaluate the expression. You should
 * supply callback pointers to read and write the registers.
 * so_eval_evaluate() should never fail. If you supply an illegal
 * value to some function, it will be clamped or the result will
 * be set to some (hopefully) useful value.
 *                                              pederb, 20000307
 */
#ifdef __cplusplus
extern "C" {
#endif /* __cplusplus */

  /* the expression node structure */
  typedef struct so_eval_node {
    int id;              /* node id */
    float value;         /* used only by value nodes */
    char regname[4];     /* register/field name in SoCalculator */
    int regidx;          /* index into vector register */
    struct so_eval_node *child1, *child2, *child3;
  } so_eval_node;

  /* callbacks are needed to read/write values from/to fields.
     When returning a float field value, write to data[0]. When
     returning a SbVec3f, set data[0], data[1] and data[2] */
  typedef struct {
    void (*readfieldcb)(const char *reg, float *data, void *userdata);

    /* 'component' only applies when setting vectors. If component < 0, copy
       all three components from data, otherwise only copy data[0] into the
       specified component (data only contains a single float */
    void (*writefieldcb)(const char *reg, float *data, int component, void *userdata);
    void *userdata;
  } so_eval_cbdata;

  /* create a tree structure from expression string */
  so_eval_node *so_eval_parse(const char *buffer); /* defined in epsilon.y */

  /* free memory used by tree structure */
  void so_eval_delete(so_eval_node *node);

  /* evaluates the tree structure */
  void so_eval_evaluate(so_eval_node *node, const so_eval_cbdata *cbdata);

  /* returns current error message, or NULL if none.
     check this after calling so_eval_parse() */
  char * so_eval_error(void); /* defined in epsilon.y */

  /* methods to create misc nodes */
  so_eval_node *so_eval_create_unary(int id, so_eval_node *topnode);
  so_eval_node *so_eval_create_binary(int id, so_eval_node *lhs, so_eval_node *rhs);
  so_eval_node *so_eval_create_ternary(int id, so_eval_node *cond,
                                       so_eval_node *branch1, so_eval_node *branch2);
  so_eval_node *so_eval_create_reg(const char *regname);
  so_eval_node *so_eval_create_reg_comp(const char *regname, int index);
  so_eval_node *so_eval_create_flt_val(float val);


/* node ids */
enum {
  ID_ADD,
  ID_ADD_VEC,
  ID_SUB,
  ID_SUB_VEC,
  ID_MUL,
  ID_DIV,
  ID_NEG,
  ID_NEG_VEC,
  ID_AND,
  ID_OR,
  ID_LEQ,
  ID_GEQ,
  ID_EQ,
  ID_NEQ,
  ID_COS,
  ID_SIN,
  ID_TAN,
  ID_ACOS,
  ID_ASIN,
  ID_ATAN,
  ID_ATAN2,
  ID_COSH,
  ID_SINH,
  ID_TANH,
  ID_SQRT,
  ID_EXP,
  ID_LOG,
  ID_LOG10,
  ID_CEIL,
  ID_FLOOR,
  ID_FABS,
  ID_FMOD,
  ID_RAND,
  ID_CROSS,
  ID_DOT,
  ID_LEN,
  ID_NORMALIZE,
  ID_TEST_FLT,
  ID_TEST_VEC,
  ID_VEC3F,
  ID_FLT_REG,
  ID_VEC_REG,
  ID_VEC_REG_COMP,
  ID_FLT_COND,
  ID_VEC_COND,
  ID_VALUE,
  ID_ASSIGN_FLT,
  ID_ASSIGN_VEC,
  ID_SEPARATOR,
  ID_NOT,
  ID_LT,
  ID_GT,
  ID_POW,
  ID_MUL_VEC_FLT,
  ID_DIV_VEC_FLT
};

/* lexical tokens */
/* do not uncomment. Bison will define these
enum {
  LEX_FLTFUNC,
  LEX_COMPARE,
  LEX_AND,
  LEX_OR,
  LEX_ATAN2,
  LEX_POW,
  LEX_FMOD,
  LEX_VEC3F,
  LEX_VALUE,
  LEX_TMP_FLT_REG,
  LEX_OUT_FLT_REG,
  LEX_IN_FLT_REG,
  LEX_TMP_VEC_REG,
  LEX_OUT_VEC_REG,
  LEX_IN_VEC_REG,
  LEX_LEN,
  LEX_ERROR
  };
*/


#ifdef __cplusplus
}; /* extern "C" */
#endif /* __cplusplus */

#endif /* COIN_EVALUATOR_H */