node Class Reference

#include <node.hpp>

Public Member Functions
	node ()
	node (double number)
	node (std::string identifier)
	node (node identifier, node number)
	node (char op, node operand)
	node (node left, char op, node right)
	~node ()=default
	node (node const &)=default
	node (node &&)=default
node &	operator= (node const &)=default
node &	operator= (node &&)=default
void	print (std::ostream &stream, int indent=0) const
double	evaluate () const
std::string	to_string () const

Static Private Member Functions
static std::shared_ptr< node_impl >	make_binary_operator (node, char, node)
	Factory function to make the binary operator nodes. More...

Private Attributes
std::shared_ptr< node_impl >	pimpl_

Detailed Description

Wrapper class for all parse-tree nodes. The actual parse tree nodes derive from node_impl. This class uses the pimpl idiom to make it easier to work with node objects.

Definition at line 16 of file node.hpp.

Constructor & Destructor Documentation

node::node

(

)

Construct a node of type void.

Definition at line 20 of file node.cpp.

: pimpl_{std::make_shared<node_void>()}
{}

node::node

(

double

number

)

Construct a numeric node.

Parameters

number

The number

Definition at line 24 of file node.cpp.

: pimpl_{std::make_shared<node_number>(number)}
{}

node::node

(

std::string

identifier

)

Construct an identifier node.

Parameters

identifier

The name of the identifier

Definition at line 28 of file node.cpp.

: pimpl_{std::make_shared<node_identifier>(std::move(identifier))}
{}

node::node	(	node	identifier,
		node	number
	)

Construct an assignment node.

Parameters

identifier	The name of the variable that is the target of the assignment
number	the node for the expression to assign to the variable

Definition at line 32 of file node.cpp.

: pimpl_{std::make_shared<node_assign>(identifier, number)}
{}

node::node	(	char	op,
		node	operand
	)

Construct a unary operator node.

Parameters

op	The operator character, e.g., '-'
operand	The operand node

Definition at line 36 of file node.cpp.

: pimpl_{std::make_shared<node_negate>(operand)}
{}

node::node	(	node	left,
		char	op,
		node	right
	)

Construct a binary operator node.

Parameters

left	The left-hand parse-tree
op	The operator character, e.g., '*'
right	The right-hand operand

Definition at line 40 of file node.cpp.

References make_binary_operator().

: pimpl_{make_binary_operator(left, op, right)}
{}

node::~node ( )

default

node::node ( node const &  )

default

node::node ( node &&  )

default

Member Function Documentation

double node::evaluate

(

)

const

Evaluate a parse tree. Evaluate and tree and return the result.

Definition at line 50 of file node.cpp.

References pimpl_.

Referenced by BOOST_AUTO_TEST_CASE(), node_binary::evaluate_left(), node_unary::evaluate_operand(), node_binary::evaluate_right(), node_assign::evaluate_value(), and parse_loop().

{
  return pimpl_->evaluate();
}

std::shared_ptr< node_impl > node::make_binary_operator ( node  left, char  op, node  right  )

staticprivate

Factory function to make the binary operator nodes.

Definition at line 6 of file node.cpp.

Referenced by node().

{
  if (op == '+')
    return std::make_shared<node_add>(left, right);
  else if (op == '-')
    return std::make_shared<node_subtract>(left, right);
  else if (op == '*')
    return std::make_shared<node_multiply>(left, right);
  else if (op == '/')
    return std::make_shared<node_divide>(left, right);
  else
    throw std::logic_error{"fatal error in make_binary_opreator: unknown operator: " + std::string(1,op)};
}

node& node::operator= ( node const &  )

default

node& node::operator= ( node &&  )

default

void node::print	(	std::ostream &	stream,
		int	indent = 0
	)		const

Print a tree. For debugging, print a visual representation of the parse tree. Each level increments the indent to make the tree structure evident.

Parameters

stream	The output stream
indent	The indentation.

Definition at line 44 of file node.cpp.

References pimpl_.

Referenced by node_assign::print_node(), node_negate::print_node(), node_add::print_node(), node_subtract::print_node(), node_multiply::print_node(), and node_divide::print_node().

{
  pimpl_->print(stream, indent);
}

std::string node::to_string

(

)

const

Return a string representation. For an identifier node, return the identifier. For all other nodes, return a string representation of the evaluated value.

Definition at line 56 of file node.cpp.

References pimpl_.

Referenced by BOOST_AUTO_TEST_CASE(), and node_assign::get_identifier().

{
  return pimpl_->to_string();
}

Member Data Documentation

std::shared_ptr<node_impl> node::pimpl_

private

Definition at line 72 of file node.hpp.

Referenced by evaluate(), print(), and to_string().

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The documentation for this class was generated from the following files:

• node.hpp
• node.cpp