915 lines
No EOL
24 KiB
C++
915 lines
No EOL
24 KiB
C++
#ifndef PARSE_TREE_HH
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#define PARSE_TREE_HH
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/**
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* Parse_tree and subtree classes
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* (c) Maarten Keijzer 1999
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* These classes may be used for educational and
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* other non-commercial purposes only. Even if I
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* wanted to, I am not at liberty to place this file
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* under the GNU Lesser Public Library License, as this
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* would limit my and my institution's freedom to use
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* this file in closed-source software.
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* This material is provided "as is", with absolutely no warranty expressed
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* or implied. Any use is at your own risk.
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*
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* Permission to use or copy this software for non-commercial purpose is hereby granted
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* without fee, provided the above notices are retained on all copies.
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* Permission to modify the code and to distribute modified code is granted,
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* provided the above notices are retained, and a notice that the code was
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* modified is included with the above copyright notice.
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*
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Usage information.
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class Node (your node in the tree) must have the following implemented:
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****** Arity ******
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int arity(void) const
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Note: the default constructor of a Node should provide a
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Node with arity 0!
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****** Evaluation ******
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A parse_tree is evaluated through one of it's apply() members:
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1) parse_tree::apply(void)
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is the simplest evaluation, it will call
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RetVal Node::operator()(subtree<Node, RetVal>::const_iterator)
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2) parse_tree::apply(It values)
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will call:
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RetVal Node::operator()(subtree<... , It values)
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where It is whatever type you desire (most of the time
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this will be a vector containing the values of your
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variables);
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3) parse_tree::apply(It values, It2 moreValues)
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will call:
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RetVal Node::operator()(subtree<... , It values, It2 moreValues)
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although I do not see the immediate use of this, however...
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4) parse_tree::apply(It values, It2 args, It3 adfs)
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that calls:
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RetVal Node::operator()(subtree<... , It values, It2 args, It3 adfs)
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can be useful for implementing adfs.
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In general it is a good idea to leave the specifics of the
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arguments open so that different ways of evaluation remain
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possible. Implement the simplest eval as:
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template <class It>
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RetVal operator()(It begin) const
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****** Internal Structure ******
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A parse_tree has two template arguments: the Node and the ReturnValue
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produced by evaluating the node. The structure of the tree is defined
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through a subtree class that has the same two template arguments.
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The nodes are stored in a tree like :
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node4
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/ \
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node3 node2
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/ \
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node1 node0
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where nodes 2 and 4 have arity 2 and nodes 0,1 and 3 arity 0 (terminals)
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The nodes are subtrees, containing the structure of the tree, together
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with its size and depth. They contain a Node, the user defined template
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argument. To access these nodes from a subtree, use operator-> or operator*.
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The numbers behind the nodes define a reverse-polish or postfix
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traversel through the tree. The parse_tree defines iterators
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on the tree such that
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tree.begin() points at the subtree at node0 and
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tree.back() returns the subtree at node4, the complete tree
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Likewise operator[] is defined on the tree, such that:
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tree[0] will return the subtree at node0, while
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tree[2] will return the subtree at node2
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Assigments of subtrees is protected so that the code:
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tree[2] = tree[0];
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will not crash and result in a tree structured as:
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node4
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/ \
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node3 node0
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Note that the rank numbers no longer specify their place in the tree:
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tree[0] still points at node0, but
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tree[1] now points to node3 and
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tree[2] points at the root node4
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Embedded iterators are implemented to iterate over nodes rather
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than subtrees. So an easy way to copy your tree to a vector is:
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vector<Node> vec(tree.size());
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copy(tree.ebegin(), tree.eend(), vec.begin());
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You can also copy it to an ostream_iterator with this
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technique, given that your Node implements an appropriate
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operator<<. Reinitializing a tree with the vector is also
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simple:
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tree.clear();
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copy(vec.begin(), vec.end(), back_inserter(tree));
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Note that the back_inserter must be used as there is no
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resize member in the parse_tree. back_inserter will use
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the push_back member from the parse_tree
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*/
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#include <vector>
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#include <utility> // for swap
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#ifdef _MSC_VER
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#pragma warning(disable : 4786) // disable this nagging warning about the limitations of the mirkosoft debugger
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#endif
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namespace gp_parse_tree
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{
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#include "node_pool.h"
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template <class T>
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inline void do_the_swap(T& a, T& b)
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{
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T tmp = a;
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a = b;
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b = tmp;
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}
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template <class T> class parse_tree
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{
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public :
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class subtree
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{
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// a bit nasty way to use a pool allocator (which would otherwise use slooow new and delete)
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#if (defined(__GNUC__) || defined(_MSC_VER)) && !defined(_MT)
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Node_alloc<T> node_allocator;
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Tree_alloc<subtree> tree_allocator;
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#else
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Standard_Node_alloc<T> node_allocator;
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Standard_alloc<subtree> tree_allocator;
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#endif
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public :
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typedef subtree* iterator;
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typedef const subtree* const_iterator;
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//typedef std::vector<subtree >::const_reverse_iterator const_reverse_iterator;
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/* Constructors, assignments */
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subtree(void) : content(node_allocator.allocate()), args(0), parent(0), _cumulative_size(0), _depth(0), _size(1)
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{}
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subtree(const subtree& s) : content(node_allocator.allocate()), args(0), parent(0), _cumulative_size(0), _depth(0), _size(1)
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{ copy(s); }
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subtree(const T& t) : content(node_allocator.allocate()), args(0), parent(0), _cumulative_size(0), _depth(0), _size(1)
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{ copy(t); }
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template <class It>
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subtree(It b, It e) : content(node_allocator.allocate()), args(0), parent(0), _cumulative_size(0), _depth(0), _size(1)
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{ // initialize in prefix way for efficiency reasons
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init(b, --e);
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}
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virtual ~subtree(void) { tree_allocator.deallocate(args, arity()); node_allocator.deallocate(content); }
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subtree& operator=(const subtree& s)
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{
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if (s.get_root() == get_root())
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{ // from the same tree, maybe a child. Don't take any chances
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subtree anotherS = s;
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return copy(anotherS);
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}
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return copy(s);
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}
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subtree& operator=(const T& t) { return copy(t); }
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/* Access to the nodes */
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T& operator*(void) { return *content; }
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const T& operator*(void) const { return *content; }
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T* operator->(void) { return content; }
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const T* operator->(void) const { return content; }
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/* Equality, inequality check, Node needs to implement operator== */
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bool operator==(const subtree& other) const
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{
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if (! (*content == *other.content))
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return false;
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for (int i = 0; i < arity(); i++)
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{
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if (!(args[i] == other.args[i]))
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return false;
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}
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return true;
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}
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bool operator !=(const subtree& other) const
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{
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return !operator==(other);
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}
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/* Arity */
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int arity(void) const { return content->arity(); }
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/* Evaluation with an increasing amount of user defined arguments */
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template <class RetVal>
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RetVal apply(RetVal v) const { return (*content)(v, begin()); }
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template <class RetVal, class It>
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RetVal apply(RetVal v, It values) const { return (*content)(v, begin(), values); }
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template <class RetVal, class It, class It2>
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RetVal apply(RetVal v, It values, It2 moreValues) const
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{ return (*content)(v, begin(), values, moreValues); }
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template <class RetVal, class It, class It2, class It3>
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RetVal apply(RetVal v, It values, It2 moreValues, It3 evenMoreValues) const
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{ return (*content)(v, begin(), values, moreValues, evenMoreValues); }
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/* Iterators */
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iterator begin(void) { return args; }
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const_iterator begin(void) const { return args; }
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iterator end(void) { return args + arity(); }
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const_iterator end(void) const { return args + arity(); }
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subtree& operator[](int i) { return *(begin() + i); }
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const subtree& operator[](int i) const { return *(begin() + i); }
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/* Some statistics */
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size_t size(void) const { return _size; }
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size_t cumulative_size(void) const { return _cumulative_size; }
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size_t depth(void) const { return _depth; }
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const subtree& select_cumulative(size_t which) const
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{ return imp_select_cumulative(which); }
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subtree& select_cumulative(size_t which)
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{ return const_cast<subtree&>(imp_select_cumulative(which)); }
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subtree& get_node(size_t which)
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{ return const_cast<subtree&>(imp_get_node(which));}
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const subtree& get_node(size_t which) const
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{ return imp_get_node(which); }
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subtree* get_parent(void) { return parent; }
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const subtree* get_parent(void) const { return parent; }
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void clear(void)
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{ tree_allocator.deallocate(args, arity()); args = 0; *content = T(); parent = 0; _cumulative_size = 0; _depth = 0; _size = 0; }
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void swap(subtree& y)
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{
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do_the_swap(content, y.content);
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do_the_swap(args, y.args);
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do_the_swap(parent, y.parent);
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do_the_swap(_cumulative_size, y._cumulative_size);
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do_the_swap(_depth, y._depth);
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do_the_swap(_size, y._size);
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updateAfterInsert();
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}
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friend void swap(subtree& x, subtree& y)
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{
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x.swap(y);
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}
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protected :
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virtual void updateAfterInsert(void)
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{
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_depth = 0;
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_size = 1;
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_cumulative_size = 0;
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for (iterator it = begin(); it != end(); ++it)
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{
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_size += it->size();
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_cumulative_size += it->_cumulative_size;
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_depth = it->_depth > _depth? it->_depth: _depth;
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}
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_cumulative_size += _size;
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_depth++;
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if (parent)
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parent->updateAfterInsert();
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}
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private :
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const subtree& imp_select_cumulative(size_t which) const
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{
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if (which >= (_cumulative_size - size()))
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return *this;
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// else
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for (int i = arity() - 1; i >= 0; --i)
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{
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if (which < args[i]._cumulative_size)
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return args[i].imp_select_cumulative(which);
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which -= args[i]._cumulative_size;
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}
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return *this; // error!
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}
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const subtree& imp_get_node(size_t which) const
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{
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if (which == size() - 1)
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return *this;
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for (int i = arity() - 1; i >= 0; --i)
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{
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unsigned c_size = args[i].size();
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if (which < c_size)
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return args[i].imp_get_node(which);
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which -= c_size;
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}
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return *this; // error!
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}
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const subtree* get_root(void) const
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{
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if (parent == 0)
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return this;
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// else
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return parent->get_root();
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}
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subtree& copy(const subtree& s)
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{
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int oldArity = arity();
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disown();
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int ar = s.arity();
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if (ar != oldArity)
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{
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tree_allocator.deallocate(args, oldArity);
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args = tree_allocator.allocate(ar);
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//if (ar > 0)
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// args = new subtree [ar];
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//else
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// args = 0;
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}
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switch(ar)
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{
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case 3 : args[2].copy(s.args[2]); // no break!
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case 2 : args[1].copy(s.args[1]);
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case 1 : args[0].copy(s.args[0]); break;
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case 0 : break;
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default :
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{
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for (int i = 0; i < ar; ++i)
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{
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args[i].copy(s.args[i]);
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}
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}
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}
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*content = *s.content;
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adopt();
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updateAfterInsert();
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return *this;
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}
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subtree& copy(const T& t)
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{
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int oldArity = arity();
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if (content != &t)
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*content = t;
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else
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oldArity = -1;
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int ar = arity();
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if (ar != oldArity)
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{
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if (oldArity != -1)
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tree_allocator.deallocate(args, oldArity);
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args = tree_allocator.allocate(ar);
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//if (ar > 0)
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// args = new subtree [ar];
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//else
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// args = 0;
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}
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adopt();
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updateAfterInsert();
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return *this;
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}
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void disown(void)
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{
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switch(arity())
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{
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case 3 : args[2].parent = 0; // no break!
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case 2 : args[1].parent = 0;
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case 1 : args[0].parent = 0; break;
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case 0 : break;
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default :
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{
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for (iterator it = begin(); it != end(); ++it)
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{
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it->parent = 0;
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}
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}
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}
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}
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void adopt(void)
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{
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switch(arity())
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{
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case 3 : args[2].parent = this; // no break!
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case 2 : args[1].parent = this;
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case 1 : args[0].parent = this; break;
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case 0 : break;
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default :
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{
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for (iterator it = begin(); it != end(); ++it)
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{
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it->parent = this;
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}
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}
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}
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}
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template <class It>
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void init(It b, It& last)
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{
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*this = *last;
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#ifndef NDEBUG
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if (last == b && arity() > 0)
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{
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throw "subtree::init()";
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}
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#endif
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for (int i = 0; i < arity(); ++i)
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{
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args[i].parent = 0;
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args[i].init(b, --last);
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args[i].parent = this;
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}
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updateAfterInsert();
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}
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T* content;
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subtree* args;
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subtree* parent;
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size_t _cumulative_size;
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size_t _depth;
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size_t _size;
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};
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// Continuing with parse_tree
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typedef T value_type;
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/* Constructors and Assignments */
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parse_tree(void) : _root(), pushed() {}
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parse_tree(const parse_tree& org) : _root(org._root), pushed(org.pushed) { }
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parse_tree(const subtree& sub) : _root(sub), pushed() { }
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template <class It>
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parse_tree(It b, It e) : _root(b, e), pushed() {}
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virtual ~parse_tree(void) {}
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parse_tree& operator=(const parse_tree& org) { return copy(org); }
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parse_tree& operator=(const subtree& sub)
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{ return copy(sub); }
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/* Equality and inequality */
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bool operator==(const parse_tree& other) const
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{ return _root == other._root; }
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bool operator !=(const parse_tree& other) const
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{ return !operator==(other); }
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/* Simple tree statistics */
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size_t size(void) const { return _root.size(); }
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size_t depth(void) const { return _root.depth(); }
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void clear(void) { _root.clear(); pushed.resize(0); }
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/* Evaluation (application), with an increasing number of user defined arguments */
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template <class RetVal>
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RetVal apply(RetVal v) const
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{ return _root.apply(v); }
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template <class RetVal, class It>
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RetVal apply(RetVal v, It varValues) const
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{ return _root.apply(v, varValues); }
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template <class RetVal, class It, class It2>
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RetVal apply(RetVal v, It varValues, It2 moreValues) const
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{ return _root.apply(v, varValues, moreValues); }
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template <class RetVal, class It, class It2, class It3>
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RetVal apply(RetVal v, It varValues, It2 moreValues, It3 evenMoreValues) const
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{ return _root.apply(v, varValues, moreValues, evenMoreValues); }
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/* Customized Swap */
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void swap(parse_tree<T>& other)
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{
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do_the_swap(pushed, other.pushed);
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_root.swap(other._root);
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}
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|
|
|
/* Definitions of the iterators */
|
|
|
|
class base_iterator
|
|
{
|
|
public :
|
|
|
|
base_iterator() {}
|
|
base_iterator(subtree* n) { node = n; }
|
|
|
|
base_iterator& operator=(const base_iterator& org)
|
|
{ node = org.node; return *this; }
|
|
|
|
bool operator==(const base_iterator& org) const
|
|
{ return node == org.node; }
|
|
bool operator!=(const base_iterator& org) const
|
|
{ return !operator==(org); }
|
|
|
|
base_iterator operator+(size_t n) const
|
|
{
|
|
base_iterator tmp = *this;
|
|
|
|
for(;n != 0; --n)
|
|
{
|
|
++tmp;
|
|
}
|
|
|
|
return tmp;
|
|
}
|
|
|
|
base_iterator& operator++(void)
|
|
{
|
|
subtree* parent = node->get_parent();
|
|
|
|
if (parent == 0)
|
|
{
|
|
node = 0;
|
|
return *this;
|
|
}
|
|
// else
|
|
subtree::iterator it;
|
|
for (it = parent->begin(); it != parent->end(); ++it)
|
|
{
|
|
if (node == &(*it))
|
|
break;
|
|
}
|
|
|
|
if (it == parent->begin())
|
|
node = parent;
|
|
else
|
|
{
|
|
node = &(--it)->get_node(0);
|
|
}
|
|
|
|
return *this;
|
|
}
|
|
|
|
base_iterator operator++(int)
|
|
{
|
|
base_iterator tmp = *this;
|
|
operator++();
|
|
return tmp;
|
|
}
|
|
|
|
protected :
|
|
subtree* node;
|
|
};
|
|
|
|
class iterator : public base_iterator
|
|
{
|
|
public :
|
|
typedef std::forward_iterator_tag iterator_category;
|
|
typedef subtree value_type;
|
|
typedef size_t distance_type;
|
|
typedef size_t difference_type;
|
|
typedef subtree* pointer;
|
|
typedef subtree& reference;
|
|
|
|
iterator() : base_iterator() {}
|
|
iterator(subtree* n): base_iterator(n) {}
|
|
iterator& operator=(const iterator& org)
|
|
{ base_iterator::operator=(org); return *this; }
|
|
|
|
subtree& operator*(void) { return *node; }
|
|
subtree* operator->(void) { return node; }
|
|
};
|
|
|
|
class embedded_iterator : public base_iterator
|
|
{
|
|
public :
|
|
typedef std::forward_iterator_tag iterator_category;
|
|
typedef T value_type;
|
|
typedef size_t distance_type;
|
|
typedef size_t difference_type;
|
|
typedef T* pointer;
|
|
typedef T& reference;
|
|
|
|
embedded_iterator() : base_iterator() {}
|
|
embedded_iterator(subtree* n): base_iterator(n) {}
|
|
embedded_iterator& operator=(const embedded_iterator& org)
|
|
{ base_iterator::operator=(org); return *this; }
|
|
|
|
T& operator*(void) { return **node; }
|
|
T* operator->(void) { return &**node; }
|
|
};
|
|
|
|
class base_const_iterator
|
|
{
|
|
public :
|
|
base_const_iterator() {}
|
|
base_const_iterator(const subtree* n) { node = n; }
|
|
|
|
base_const_iterator& operator=(const base_const_iterator& org)
|
|
{ node = org.node; return *this; }
|
|
|
|
bool operator==(const base_const_iterator& org) const
|
|
{ return node == org.node; }
|
|
bool operator!=(const base_const_iterator& org) const
|
|
{ return !operator==(org); }
|
|
|
|
base_const_iterator& operator++(void)
|
|
{
|
|
const subtree* parent = node->get_parent();
|
|
|
|
if (parent == 0)
|
|
{
|
|
node = 0;
|
|
return *this;
|
|
}
|
|
// else
|
|
subtree::const_iterator it;
|
|
|
|
for (it = parent->begin(); it != parent->end(); ++it)
|
|
{
|
|
if (node == &(*it))
|
|
break;
|
|
}
|
|
|
|
if (it == parent->begin())
|
|
node = parent;
|
|
else
|
|
node = &(--it)->get_node(0);
|
|
return *this;
|
|
}
|
|
|
|
base_const_iterator operator++(int)
|
|
{
|
|
base_const_iterator tmp = *this;
|
|
operator++();
|
|
return tmp;
|
|
}
|
|
|
|
protected :
|
|
|
|
const subtree* node;
|
|
};
|
|
|
|
class const_iterator : public base_const_iterator
|
|
{
|
|
public :
|
|
typedef std::forward_iterator_tag iterator_category;
|
|
typedef const subtree value_type;
|
|
typedef size_t distance_type;
|
|
typedef size_t difference_type;
|
|
typedef const subtree* pointer;
|
|
typedef const subtree& reference;
|
|
|
|
const_iterator() : base_const_iterator() {}
|
|
const_iterator(const subtree* n): base_const_iterator(n) {}
|
|
const_iterator& operator=(const const_iterator& org)
|
|
{ base_const_iterator::operator=(org); return *this; }
|
|
|
|
const subtree& operator*(void) { return *node; }
|
|
const subtree* operator->(void) { return node; }
|
|
};
|
|
|
|
class embedded_const_iterator : public base_const_iterator
|
|
{
|
|
public :
|
|
typedef std::forward_iterator_tag iterator_category;
|
|
typedef const T value_type;
|
|
typedef size_t distance_type;
|
|
typedef size_t difference_type;
|
|
typedef const T* pointer;
|
|
typedef const T& reference;
|
|
|
|
embedded_const_iterator() : base_const_iterator() {}
|
|
embedded_const_iterator(const subtree* n): base_const_iterator(n) {}
|
|
embedded_const_iterator& operator=(const embedded_const_iterator& org)
|
|
{ base_const_iterator::operator=(org); return *this; }
|
|
|
|
embedded_const_iterator operator+(size_t n) const
|
|
{
|
|
embedded_const_iterator tmp = *this;
|
|
|
|
for(;n != 0; --n)
|
|
{
|
|
++tmp;
|
|
}
|
|
|
|
return tmp;
|
|
}
|
|
|
|
const T& operator*(void) const { return **node; }
|
|
const T* operator->(void) const { return node->operator->(); }
|
|
};
|
|
|
|
/* Iterator access */
|
|
|
|
iterator begin(void) { return iterator(&operator[](0)); }
|
|
const_iterator begin(void) const { return const_iterator(&operator[](0)); }
|
|
iterator end(void) { return iterator(0); }
|
|
const_iterator end(void) const { return const_iterator(0);}
|
|
|
|
embedded_iterator ebegin(void) { return embedded_iterator(&operator[](0)); }
|
|
embedded_const_iterator ebegin(void) const { return embedded_const_iterator(&operator[](0)); }
|
|
embedded_iterator eend(void) { return embedded_iterator(0); }
|
|
embedded_const_iterator eend(void) const { return embedded_const_iterator(0);}
|
|
|
|
bool empty(void) const { return size() == 0; }
|
|
bool valid(void) const { return pushed.empty(); }
|
|
|
|
/* push_back */
|
|
|
|
void push_back(const parse_tree<T>& tree)
|
|
{
|
|
if (!empty())
|
|
pushed.push_back(_root);
|
|
|
|
_root = tree.back();
|
|
}
|
|
|
|
void push_back(const T& t)
|
|
{
|
|
if (!empty())
|
|
pushed.push_back(_root);
|
|
|
|
_root = t;
|
|
|
|
for (subtree::iterator it = _root.begin(); it != _root.end(); it++)
|
|
{
|
|
*it = pushed.back();
|
|
pushed.pop_back();
|
|
}
|
|
|
|
}
|
|
|
|
/* Access to subtrees */
|
|
|
|
subtree& back(void) { return _root; }
|
|
const subtree& back(void) const { return _root; }
|
|
subtree& root(void) { return _root; }
|
|
const subtree& root(void) const { return _root; }
|
|
|
|
subtree& front(void) { return _root[0]; }
|
|
const subtree& front(void) const { return _root[0]; }
|
|
|
|
subtree& operator[](size_t i)
|
|
{ return const_cast<subtree&>(_root.get_node(i)); }
|
|
const subtree& operator[](size_t i) const
|
|
{ return _root.get_node(i); }
|
|
|
|
subtree& get_cumulative(size_t i)
|
|
{ return const_cast<subtree&>(_root.get_cumulative(i)); }
|
|
const subtree& get_cumulative(size_t i) const
|
|
{ return get_cumulative(i); }
|
|
|
|
private :
|
|
|
|
parse_tree& copy(const parse_tree& org)
|
|
{
|
|
_root = org._root;
|
|
pushed = org.pushed;
|
|
|
|
return *this;
|
|
}
|
|
|
|
parse_tree& copy(const subtree& sub)
|
|
{ _root = sub; pushed.resize(0); return *this; }
|
|
|
|
subtree _root;
|
|
std::vector<subtree > pushed;
|
|
}; // end class parse_tree
|
|
|
|
|
|
} // end namespace gp_parse_tree
|
|
|
|
namespace std
|
|
{ // for use with stlport on MSVC
|
|
|
|
template <class T> inline
|
|
std::forward_iterator_tag iterator_category(gp_parse_tree::parse_tree<T>::embedded_iterator)
|
|
{
|
|
return std::forward_iterator_tag();
|
|
}
|
|
|
|
template <class T> inline
|
|
ptrdiff_t* distance_type(gp_parse_tree::parse_tree<T>::embedded_iterator)
|
|
{
|
|
return 0;
|
|
}
|
|
|
|
template <class T> inline
|
|
std::forward_iterator_tag iterator_category(gp_parse_tree::parse_tree<T>::iterator)
|
|
{
|
|
return std::forward_iterator_tag();
|
|
}
|
|
|
|
template <class T> inline
|
|
ptrdiff_t* distance_type(gp_parse_tree::parse_tree<T>::iterator)
|
|
{
|
|
return 0;
|
|
}
|
|
|
|
// Put customized swaps also in std...
|
|
|
|
template<class T> inline
|
|
void swap(gp_parse_tree::parse_tree<T>& a, gp_parse_tree::parse_tree<T>& b)
|
|
{
|
|
a.swap(b);
|
|
}
|
|
|
|
template<class T> inline
|
|
void iter_swap(vector<gp_parse_tree::parse_tree<T> >::iterator a, vector<gp_parse_tree::parse_tree<T> > b)
|
|
{
|
|
a->swap(*b);
|
|
}
|
|
|
|
|
|
} // namespace std
|
|
|
|
|
|
#endif |