variables.cpp File Reference

#include <map>
#include "calc_error.hpp"
#include "node.hpp"
#include "variables.hpp"

Go to the source code of this file.

Functions
bool	find_symbol (std::string const &name, node &value)
node	get_variable (std::string const &name)
void	set_variable (std::string const &name, node value)
node	get_function (std::string const &name)
void	set_function (std::string const &name, node value)

Function Documentation

bool find_symbol	(	std::string const &	name,
		node &	value
	)

Definition at line 32 of file variables.cpp.

Referenced by get_function(), and get_variable().

{
  for (auto iter(symbol_tables.rbegin()), end(symbol_tables.rend()); iter != end; ++iter) {
    symbol_table const& table{ **iter };
    symbol_table::const_iterator entry{ table.find(name) };
    if (entry != table.end()) {
      value = entry->second;
      return true;
    }
  }
  return false;
}

node get_function

(

std::string const &

name

)

Get the definition of a function.

Parameters

name	The function name

Returns

The definition of function named name

Exceptions

no_such_function

if the function is not defined

Definition at line 61 of file variables.cpp.

References find_symbol().

Referenced by node_function_call::evaluate_node().

{
  node result{};
  if (not find_symbol(name, result))
    throw no_such_function{name};
  else
    return result;
}

node get_variable

(

std::string const &

name

)

Get the value of a variable.

Parameters

name	The variable name

Returns

The value of variable name or node() if the variable is undefined.

Definition at line 45 of file variables.cpp.

References find_symbol().

Referenced by BOOST_AUTO_TEST_CASE(), and node_identifier::evaluate_node().

{
  node result{};
  if (not find_symbol(name, result))
    return node();
  else if (result.get_parameters().empty())
    return result;
  else
    throw function_error{name, result.get_parameters().size(), 0};
}

void set_function	(	std::string const &	name,
		node	definition
	)

Set the definition of a function.

Parameters

name	The function name
definition	The function definition

Definition at line 70 of file variables.cpp.

References set_variable().

Referenced by BOOST_AUTO_TEST_CASE(), and parser::get_statement().

{
  set_variable(name, value);
}

void set_variable	(	std::string const &	name,
		node	value
	)

Set the value of a variable.

Parameters

name	The variable name
value	The value. if the variable is already defined, changes its value.

Definition at line 56 of file variables.cpp.

Referenced by BOOST_AUTO_TEST_CASE(), and set_function().

{
  variables[name] = value;
}