/* -------------------------------------------------------------------------- *
 *                                   Lepton                                   *
 * -------------------------------------------------------------------------- *
 * This is part of the Lepton expression parser originating from              *
 * Simbios, the NIH National Center for Physics-Based Simulation of           *
 * Biological Structures at Stanford, funded under the NIH Roadmap for        *
 * Medical Research, grant U54 GM072970. See https://simtk.org.               *
 *                                                                            *
 * Portions copyright (c) 2009 Stanford University and the Authors.           *
 * Authors: Peter Eastman                                                     *
 * Contributors:                                                              *
 *                                                                            *
 * Permission is hereby granted, free of charge, to any person obtaining a    *
 * copy of this software and associated documentation files (the "Software"), *
 * to deal in the Software without restriction, including without limitation  *
 * the rights to use, copy, modify, merge, publish, distribute, sublicense,   *
 * and/or sell copies of the Software, and to permit persons to whom the      *
 * Software is furnished to do so, subject to the following conditions:       *
 *                                                                            *
 * The above copyright notice and this permission notice shall be included in *
 * all copies or substantial portions of the Software.                        *
 *                                                                            *
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR *
 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,   *
 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL    *
 * THE AUTHORS, CONTRIBUTORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM,    *
 * DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR      *
 * OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE  *
 * USE OR OTHER DEALINGS IN THE SOFTWARE.                                     *
 * -------------------------------------------------------------------------- */

#include "ExpressionTreeNode.h"
#include "Exception.h"
#include "Operation.h"

using namespace Lepton;

ExpressionTreeNode::ExpressionTreeNode(Operation* operation, const std::vector<ExpressionTreeNode>& children) : operation(operation), children(children)
{
	if (size_t(operation->getNumArguments()) != children.size())
	{
		throw Exception("Parse error: wrong number of arguments to function: " + operation->getName());
	}
}

ExpressionTreeNode::ExpressionTreeNode(Operation* operation, const ExpressionTreeNode& child1, const ExpressionTreeNode& child2) : operation(operation)
{
	children.push_back(child1);
	children.push_back(child2);
	if (size_t(operation->getNumArguments()) != children.size())
	{
		throw Exception("Parse error: wrong number of arguments to function: " + operation->getName());
	}
}

ExpressionTreeNode::ExpressionTreeNode(Operation* operation, const ExpressionTreeNode& child) : operation(operation)
{
	children.push_back(child);
	if (size_t(operation->getNumArguments()) != children.size())
	{
		throw Exception("Parse error: wrong number of arguments to function: " + operation->getName());
	}
}

ExpressionTreeNode::ExpressionTreeNode(Operation* operation) : operation(operation)
{
	if (size_t(operation->getNumArguments()) != children.size())
	{
		throw Exception("Parse error: wrong number of arguments to function: " + operation->getName());
	}
}

ExpressionTreeNode::ExpressionTreeNode(const ExpressionTreeNode& node) : operation(node.getOperation().clone()), children(node.getChildren()) {}

ExpressionTreeNode::ExpressionTreeNode() {}

ExpressionTreeNode::~ExpressionTreeNode() { delete operation; }

bool ExpressionTreeNode::operator!=(const ExpressionTreeNode& node) const
{
	if (node.getOperation() != getOperation()) { return true; }
	if (getOperation().isSymmetric() && getChildren().size() == 2)
	{
		if (getChildren()[0] == node.getChildren()[0] && getChildren()[1] == node.getChildren()[1]) { return false; }
		if (getChildren()[0] == node.getChildren()[1] && getChildren()[1] == node.getChildren()[0]) { return false; }
		return true;
	}
	for (size_t i = 0; i < getChildren().size(); ++i) { if (getChildren()[i] != node.getChildren()[i]) { return true; } }
	return false;
}

bool ExpressionTreeNode::operator==(const ExpressionTreeNode& node) const { return !(*this != node); }

ExpressionTreeNode& ExpressionTreeNode::operator=(const ExpressionTreeNode& node)
{
	delete operation;
	operation = node.getOperation().clone();
	children  = node.getChildren();
	return *this;
}

const Operation& ExpressionTreeNode::getOperation() const { return *operation; }
const std::vector<ExpressionTreeNode>& ExpressionTreeNode::getChildren() const { return children; }