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)
Variables
symbol_table	variables
std::vector < symbol_table const * >	symbol_tables
initializer	init

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Function Documentation

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

Definition at line 32 of file variables.cpp.

References symbol_tables.

Referenced by get_function(), and get_variable().

{
  for (std::vector<symbol_table const*>::reverse_iterator iter(symbol_tables.rbegin()); iter != symbol_tables.rend(); ++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.

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.

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.

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;
}

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Variable Documentation

initializer init [static]

Definition at line 19 of file variables.cpp.

std::vector<symbol_table const*> symbol_tables [static]

Definition at line 9 of file variables.cpp.

Referenced by find_symbol(), set_symbol_table::set_symbol_table(), and set_symbol_table::~set_symbol_table().

symbol_table variables [static]

Definition at line 8 of file variables.cpp.

Referenced by set_variable().

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