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/*

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 *

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 *

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 *

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 * This code is made available on the understanding that it will not be

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 * used in safety-critical situations without a full and competent review.

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 */

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#include <string.h>

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typedef struct

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{

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  symbol_c *param_name;

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  symbol_c *param_value;

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  symbol_c *param_type;

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  function_param_iterator_c::param_direction_t param_direction;

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} FUNCTION_PARAM;

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#define DECLARE_PARAM_LIST()\

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  std::list<FUNCTION_PARAM*> param_list;\

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  std::list<FUNCTION_PARAM*>::iterator pt;\

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  FUNCTION_PARAM *param;

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#define ADD_PARAM_LIST(name, value, type, direction)\

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  param = new FUNCTION_PARAM;\

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  param->param_name = name;\

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  param->param_value = value;\

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  param->param_type = type;\

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  param->param_direction = direction;\

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  param_list.push_back(param);

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#define PARAM_LIST_ITERATOR() for(pt = param_list.begin(); pt != param_list.end(); pt++)

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#define PARAM_NAME (*pt)->param_name

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#define PARAM_VALUE (*pt)->param_value

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#define PARAM_TYPE (*pt)->param_type

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#define PARAM_DIRECTION (*pt)->param_direction

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#define CLEAR_PARAM_LIST()\

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  PARAM_LIST_ITERATOR()\

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    delete *pt;\

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  param_list.clear();

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class generate_c_base_c: public iterator_visitor_c {

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  protected:

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    stage4out_c &s4o;

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  private:

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    /* Unlike programs that are mapped onto C++ classes, Function Blocks are mapped onto a data structure type

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     * and a separate function containing the code. This function is passed a pointer to an instance of the data

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     * structure. This means that the code inside the functions must insert a pointer to the data structure whenever

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     * it wishes to access a Function Block variable.

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     * The variable_prefix_ variable will contain the correct string which needs to be prefixed to all variable accesses.

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     * This string is set with the set_variable_prefix() member function.

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     */

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    const char *variable_prefix_;

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  public:

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    generate_c_base_c(stage4out_c *s4o_ptr): s4o(*s4o_ptr) {

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      variable_prefix_ = NULL;

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    }

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    ~generate_c_base_c(void) {}

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    void set_variable_prefix(const char *variable_prefix) {variable_prefix_ = variable_prefix;}

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    const char *get_variable_prefix(void) {return variable_prefix_;}

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    bool is_variable_prefix_null(void) {return variable_prefix_ == NULL;}

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    void print_variable_prefix(void) {

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      if (variable_prefix_ != NULL)

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        s4o.print(variable_prefix_);

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    }

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    void *print_token(token_c *token, int offset = 0) {

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      return s4o.printupper((token->value)+offset);

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    }

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    void *print_literal(symbol_c *type, symbol_c *value) {

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      s4o.print("__");

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      type->accept(*this);

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      s4o.print("_LITERAL(");

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      value->accept(*this);

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      s4o.print(")");

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      return NULL;

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    }

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    void *print_striped_token(token_c *token, int offset = 0) {

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      std::string str = "";

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      for (unsigned int i = offset; i < strlen(token->value); i++)

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        if (token->value[i] != '_')

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          str += token->value[i];

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      return s4o.printupper(str);

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    }

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    void *print_striped_binary_token(token_c *token, unsigned int offset = 0) {

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      /* convert the binary value to hexadecimal format... */

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      unsigned char value, bit_mult;

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      unsigned int i;

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      int total_bits;

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      char str[2] = {'A', '\0'};  /* since the s4o object is not prepared to print out one character at a time... */

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      s4o.print("0x");

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      total_bits = 0;

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      for (i = offset; i < strlen(token->value); i++)

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        if (token->value[i] != '_')

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	  total_bits++;

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      value = 0;

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      bit_mult = (unsigned char)1 << (((total_bits+3)%4)+1);

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      for (i = offset; i < strlen(token->value); i++) {

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        if (token->value[i] != '_') {

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	  bit_mult /= 2;

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	  value += bit_mult * ((token->value[i] == '0')? 0:1);

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	  if (bit_mult == 1) {

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	    str[0] = (value <= 9)? (char)'0' + value : (char)'A' + value;

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	    s4o.print(str);

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            bit_mult = 0x10;

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            value = 0;

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	  }

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	}

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      }

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      return NULL;

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    }

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    void *print_list(list_c *list,

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		     std::string pre_elem_str = "",

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		     std::string inter_elem_str = "",

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		     std::string post_elem_str = "",

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		     visitor_c *visitor = NULL) {

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      if (visitor == NULL) visitor = this;

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      if (list->n > 0) {

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//std::cout << "generate_c_base_c::print_list(n = " << list->n << ")   000\n";

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        s4o.print(pre_elem_str);

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        list->elements[0]->accept(*visitor);

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      }

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      for(int i = 1; i < list->n; i++) {

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//std::cout << "generate_c_base_c::print_list   " << i << "\n";

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        s4o.print(inter_elem_str);

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        list->elements[i]->accept(*visitor);

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      }

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      if (list->n > 0)

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        s4o.print(post_elem_str);

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      return NULL;

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    }

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    void *print_binary_expression(symbol_c *l_exp,

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				  symbol_c *r_exp,

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				  const char *operation) {

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      s4o.print("(");

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      l_exp->accept(*this);

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      s4o.print(operation);

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      r_exp->accept(*this);

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      s4o.print(")");

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      return NULL;

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    }

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    void *print_unary_expression(symbol_c *exp,

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				 const char *operation) {

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      s4o.print(operation);

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      s4o.print("(");

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      exp->accept(*this);

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      s4o.print(")");

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      return NULL;

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    }

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    void *print_binary_function(const char *function,

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          symbol_c *l_exp,

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				  symbol_c *r_exp) {

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      s4o.print(function);

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      s4o.print("(");

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      l_exp->accept(*this);

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      s4o.print(", ");

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      r_exp->accept(*this);

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      s4o.print(")");

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      return NULL;

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   	}

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    void *print_compare_function(const char *function,

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          symbol_c *compare_type,

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          symbol_c *l_exp,

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          symbol_c *r_exp) {

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      s4o.print(function);

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      compare_type->accept(*this);

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      s4o.print("(__BOOL_LITERAL(TRUE), NULL, 2, ");

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      l_exp->accept(*this);

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      s4o.print(", ");

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      r_exp->accept(*this);

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      s4o.print(")");

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      return NULL;

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    }

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    void *print_check_function(symbol_c *type,

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          symbol_c *value,

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          symbol_c *fb_name = NULL,

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          bool temp = false) {

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      search_base_type_c search_base_type;

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      bool is_subrange = search_base_type.type_is_subrange(type);

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      if (is_subrange) {

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		s4o.print("__CHECK_");

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		type->accept(*this);

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		s4o.print("(");

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      }

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      if (fb_name != NULL) {

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        s4o.print(GET_VAR);

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        s4o.print("(");

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        print_variable_prefix();

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        fb_name->accept(*this);

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        s4o.print(".");

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        value->accept(*this);

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        s4o.print(")");

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      }

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      else {

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        if (temp)

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    	  s4o.print(TEMP_VAR);

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        value->accept(*this);

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      }

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      if (is_subrange)

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        s4o.print(")");

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      return NULL;

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    }

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/********************/

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/* 2.1.6 - Pragmas  */

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/********************/

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    void *visit(enable_code_generation_pragma_c * symbol)   {s4o.enable_output();  return NULL;}

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    void *visit(disable_code_generation_pragma_c * symbol)  {s4o.disable_output(); return NULL;} 

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    /* Do not use print_token() as it will change everything into uppercase */

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    void *visit(pragma_c *symbol) {return s4o.print(symbol->value);}

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/***************************/

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/* B 0 - Programming Model */

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/***************************/

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  /* leave for derived classes... */

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/*************************/

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/* B.1 - Common elements */

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/*************************/

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/*******************************************/

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/* B 1.1 - Letters, digits and identifiers */

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/*******************************************/

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    void *visit(identifier_c *symbol) {return print_token(symbol);}

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/*********************/

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/* B 1.2 - Constants */

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/*********************/

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  /* originally empty... */

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/******************************/

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/* B 1.2.1 - Numeric Literals */

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/******************************/

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    void *visit(real_c *symbol) {return print_striped_token(symbol);}

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    void *visit(integer_c *symbol) {return print_striped_token(symbol);}

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    void *visit(binary_integer_c *symbol) {return print_striped_binary_token(symbol, 2);}

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    void *visit(octal_integer_c *symbol) {s4o.print("0"); return print_striped_token(symbol, 2);}

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    void *visit(hex_integer_c *symbol) {s4o.print("0x"); return print_striped_token(symbol, 3);}

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    void *visit(neg_real_c *symbol) {

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      s4o.print("-");

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      symbol->exp->accept(*this);

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      return NULL;

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    }

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    void *visit(neg_integer_c *symbol) {

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      s4o.print("-");

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      symbol->exp->accept(*this);

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      return NULL;

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    }

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    void *visit(integer_literal_c *symbol) {return print_literal(symbol->type, symbol->value);}

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    void *visit(real_literal_c *symbol) {return print_literal(symbol->type, symbol->value);}

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    void *visit(bit_string_literal_c *symbol) {return print_literal(symbol->type, symbol->value);}

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    void *visit(boolean_literal_c *symbol) {

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      if (NULL != symbol->type)

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        return print_literal(symbol->type, symbol->value);

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      else {

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	bool_type_name_c bool_type;

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	return print_literal(&bool_type, symbol->value);

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      }

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    }

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    /* helper class for boolean_literal_c */

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    void *visit(boolean_true_c *symbol) {s4o.print("TRUE"); return NULL;}

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    void *visit(boolean_false_c *symbol) {s4o.print("FALSE"); return NULL;}

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    void *visit(neg_expression_c *symbol) {

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      s4o.print("-");

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      symbol->exp->accept(*this);

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      return NULL;

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    }

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/*******************************/

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/* B.1.2.2   Character Strings */

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/*******************************/

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    void *visit(double_byte_character_string_c *symbol) {

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      // TO DO ...

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      ERROR;

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      return print_token(symbol);

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    }

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    void *visit(single_byte_character_string_c *symbol) {

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      std::string str = "";

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      unsigned int count = 0; 

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      str += '"';

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      /* we ignore the first and last bytes, they will be the character ' */

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      for (unsigned int i = 1; i < strlen(symbol->value) - 1; i++) {

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        char c = symbol->value[i];

   337

        if ((c == '\\') || (c == '"'))

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          {str += '\\'; str += c; count ++; continue;}

   339

        if (c != '$')

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          {str += c; count++; continue;}

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        /* this should be safe, since the code has passed the syntax parser!! */

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        c = symbol->value[++i];

   343

        switch (c) {

   344

          case '$':

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          case '\'':

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            {str += c; count++; continue;}

   347

          case 'L':

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          case 'l':

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            {str += "\x0A"; /* LF */; count++; continue;}

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          case 'N':

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          case 'n':

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            {str += "\\x0A"; /* NL */; count++; continue;}

   353

          case 'P':

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          case 'p':

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            {str += "\\f"; /* FF */; count++; continue;}

   356

          case 'R':

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          case 'r':

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            {str += "\\r"; /* CR */; count++; continue;}

   359

          case 'T':

   360

          case 't':

   361

            {str += "\\t"; /* tab */; count++; continue;}

   362

          default: {

   363

            if (isxdigit(c)) {

   364

              /* this should be safe, since the code has passed the syntax parser!! */

   365

	      char c2 = symbol->value[++i];

   366

	      if (isxdigit(c2)) {

   367

	        str += '\\'; str += 'x'; str += c; str += c2;

   368

	        count++; continue;

   369

	      }

   370

	    }

   371

          }

   372

          /* otherwise we have an invalid string!! */

   373

          /* This should not have got through the syntax parser! */

   374

          ERROR;

   375

        } /* switch() */

   376

      } /* for() */

   377

   378

      str += '"';

   379

      s4o.print("__STRING_LITERAL(");

   380

      s4o.print_integer(count); 

   381

      s4o.print(",");

   382

      s4o.print(str);

   383

      s4o.print(")");

   384

      return NULL;

   385

    }

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/***************************/

   389

/* B 1.2.3 - Time Literals */

   390

/***************************/

   391

   392

/************************/

   393

/* B 1.2.3.1 - Duration */

   394

/************************/

   395

/* The following output is actually the parameters to the constructor of the TIME class! */

   396

   397

/* SYM_REF0(neg_time_c) */

   398

void *visit(neg_time_c *symbol) {s4o.print("-1"); /* negative time value */; return NULL;}

   399

   400

   401

/* SYM_REF2(duration_c, neg, interval) */

   402

void *visit(duration_c *symbol) {

   403

  TRACE("duration_c");

   404

  s4o.print("__time_to_timespec(");

   405

  if (NULL == symbol->neg)

   406

    s4o.print("1");  /* positive time value */

   407

  else

   408

    symbol->neg->accept(*this);  /* this will print '-1'   :-) */

   409

   410

  s4o.print(", ");

   411

   412

  symbol->interval->accept(*this);

   413

  if (typeid(*symbol->interval) == typeid(hours_c)) {s4o.print(", 0");}

   414

  if (typeid(*symbol->interval) == typeid(minutes_c)) {s4o.print(", 0, 0");}

   415

  if (typeid(*symbol->interval) == typeid(seconds_c)) {s4o.print(", 0, 0, 0");}

   416

  if (typeid(*symbol->interval) == typeid(milliseconds_c)) {s4o.print(", 0, 0, 0, 0");}

   417

  s4o.print(")");

   418

  return NULL;

   419

}

   420

   421

   422

/* SYM_TOKEN(fixed_point_c) */

   423

void *visit(fixed_point_c *symbol) {return print_token(symbol);}

   424

   425

   426

/* SYM_REF2(days_c, days, hours) */

   427

void *visit(days_c *symbol) {

   428

  TRACE("days_c");

   429

  if (NULL == symbol->hours)

   430

    s4o.print("0, 0, 0, 0");  /* milliseconds, seconds, minutes, hours */

   431

  else

   432

    symbol->hours->accept(*this);

   433

   434

  s4o.print(", ");

   435

   436

  symbol->days->accept(*this);

   437

  return NULL;

   438

}

   439

   440

   441

/* SYM_REF2(hours_c, hours, minutes) */

   442

void *visit(hours_c *symbol) {

   443

  TRACE("hours_c");

   444

  if (NULL == symbol->minutes)

   445

    s4o.print("0, 0, 0");  /* milliseconds, seconds, minutes */

   446

  else

   447

    symbol->minutes->accept(*this);

   448

   449

  s4o.print(", ");

   450

   451

  symbol->hours->accept(*this);

   452

  return NULL;

   453

}

   454

   455

   456

/* SYM_REF2(minutes_c, minutes, seconds) */

   457

void *visit(minutes_c *symbol) {

   458

  TRACE("minutes_c");

   459

  if (NULL == symbol->seconds)

   460

    s4o.print("0, 0");  /* milliseconds, seconds */

   461

  else

   462

    symbol->seconds->accept(*this);

   463

   464

  s4o.print(", ");

   465

   466

  symbol->minutes->accept(*this);

   467

  return NULL;

   468

}

   469

   470

   471

/* SYM_REF2(seconds_c, seconds, milliseconds) */

   472

void *visit(seconds_c *symbol) {

   473

  TRACE("seconds_c");

   474

  if (NULL == symbol->milliseconds)

   475

    s4o.print("0");  /* milliseconds */

   476

  else

   477

    symbol->milliseconds->accept(*this);

   478

   479

  s4o.print(", ");

   480

   481

  symbol->seconds->accept(*this);

   482

  return NULL;

   483

}

   484

   485

   486

/* SYM_REF2(milliseconds_c, milliseconds, unused) */

   487

void *visit(milliseconds_c *symbol) {

   488

  TRACE("milliseconds_c");

   489

  symbol->milliseconds->accept(*this);

   490

  return NULL;

   491

}

   492

   493

/************************************/

   494

/* B 1.2.3.2 - Time of day and Date */

   495

/************************************/

   496

   497

/* SYM_REF2(time_of_day_c, daytime, unused) */

   498

void *visit(time_of_day_c *symbol) {

   499

  TRACE("time_of_day_c");

   500

  s4o.print("__tod_to_timespec(");

   501

  symbol->daytime->accept(*this);

   502

  s4o.print(")");

   503

  return NULL;

   504

}

   505

   506

   507

/* SYM_REF4(daytime_c, day_hour, day_minute, day_second, unused) */

   508

void *visit(daytime_c *symbol) {

   509

  TRACE("daytime_c");

   510

  symbol->day_second->accept(*this);

   511

  s4o.print(", ");

   512

  symbol->day_minute->accept(*this);

   513

  s4o.print(", ");

   514

  symbol->day_hour->accept(*this);

   515

  return NULL;

   516

}

   517

   518