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# node.cpp

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    00001 #include <stdexcept>
    00002
    00003 #include "node.hpp"
    00004 #include "node_impl.hpp"
    00005
    00006 node_impl* node::make_binary_operator(node left, char op, node right)
    00007 {
    00008   if (op == '+')
    00009     return new node_add(left, right);
    00010   else if (op == '-')
    00011     return new node_subtract(left, right);
    00012   else if (op == '*')
    00013     return new node_multiply(left, right);
    00014   else if (op == '/')
    00015     return new node_divide(left, right);
    00016   else
    00017     throw std::logic_error("fatal error in make_binary_opreator: unknown operator: " + op);
    00018 }
    00019
    00020 node::node()
    00021 : pimpl_(new node_void())
    00022 {}
    00023
    00024 node::node(node const& n)
    00025 : pimpl_(n.pimpl_)
    00026 {
    00027   pimpl_->add_ref();
    00028 }
    00029
    00030 node::node(double number)
    00031 : pimpl_(new node_number(number))
    00032 {}
    00033
    00034 node::node(std::string const& identifier)
    00035 : pimpl_(new node_identifier(identifier))
    00036 {}
    00037
    00038 node::node(node identifier, node number)
    00039 : pimpl_(new node_assign(identifier, number))
    00040 {}
    00041
    00042 node::node(char op, node operand)
    00043 : pimpl_(new node_negate(operand))
    00044 {}
    00045
    00046 node::node(node left, char op, node right)
    00047 : pimpl_(make_binary_operator(left, op, right))
    00048 {}
    00049
    00050 node::~node()
    00051 {
    00052   pimpl_->del_ref();
    00053 }
    00054
    00055 node& node::operator=(node const& n)
    00056 {
    00057   n.pimpl_->add_ref();
    00058   pimpl_->del_ref();
    00059   pimpl_ = n.pimpl_;
    00060
    00061   return *this;
    00062 }
    00063
    00064 void node::print(std::ostream& stream, int indent)
    00065 const
    00066 {
    00067   pimpl_->print(stream, indent);
    00068 }
    00069
    00070 double node::evaluate()
    00071 const
    00072 {
    00073   return pimpl_->evaluate();
    00074 }
    00075
    00076 std::string node::to_string()
    00077 const
    00078 {
    00079   return pimpl_->to_string();
    00080 }