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/**
* Licensed to the Apache Software Foundation (ASF) under one
* or more contributor license agreements. See the NOTICE file
* distributed with this work for additional information
* regarding copyright ownership. The ASF licenses this file
* to you under the Apache License, Version 2.0 (the
* "License"); you may not use this file except in compliance
* with the License. You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
#include "ExpressionTree.hh"
#include <cassert>
#include <sstream>
namespace orc {
ExpressionTree::ExpressionTree(Operator op)
: operator_(op), leaf_(UNUSED_LEAF), constant_(TruthValue::YES_NO_NULL) {}
ExpressionTree::ExpressionTree(Operator op, std::initializer_list<TreeNode> children)
: operator_(op),
children_(children.begin(), children.end()),
leaf_(UNUSED_LEAF),
constant_(TruthValue::YES_NO_NULL) {
// PASS
}
ExpressionTree::ExpressionTree(size_t leaf)
: operator_(Operator::LEAF), children_(), leaf_(leaf), constant_(TruthValue::YES_NO_NULL) {
// PASS
}
ExpressionTree::ExpressionTree(TruthValue constant)
: operator_(Operator::CONSTANT), children_(), leaf_(UNUSED_LEAF), constant_(constant) {
// PASS
}
ExpressionTree::ExpressionTree(const ExpressionTree& other)
: operator_(other.operator_), leaf_(other.leaf_), constant_(other.constant_) {
for (TreeNode child : other.children_) {
children_.emplace_back(std::make_shared<ExpressionTree>(*child));
}
}
ExpressionTree::Operator ExpressionTree::getOperator() const {
return operator_;
}
const std::vector<TreeNode>& ExpressionTree::getChildren() const {
return children_;
}
std::vector<TreeNode>& ExpressionTree::getChildren() {
return const_cast<std::vector<TreeNode>&>(
const_cast<const ExpressionTree*>(this)->getChildren());
}
const TreeNode ExpressionTree::getChild(size_t i) const {
return children_.at(i);
}
TreeNode ExpressionTree::getChild(size_t i) {
return std::const_pointer_cast<ExpressionTree>(
const_cast<const ExpressionTree*>(this)->getChild(i));
}
TruthValue ExpressionTree::getConstant() const {
assert(operator_ == Operator::CONSTANT);
return constant_;
}
size_t ExpressionTree::getLeaf() const {
assert(operator_ == Operator::LEAF);
return leaf_;
}
void ExpressionTree::setLeaf(size_t leaf) {
assert(operator_ == Operator::LEAF);
leaf_ = leaf;
}
void ExpressionTree::addChild(TreeNode child) {
children_.push_back(child);
}
TruthValue ExpressionTree::evaluate(const std::vector<TruthValue>& leaves) const {
TruthValue result;
switch (operator_) {
case Operator::OR: {
result = children_.at(0)->evaluate(leaves);
for (size_t i = 1; i < children_.size() && !isNeeded(result); ++i) {
result = children_.at(i)->evaluate(leaves) || result;
}
return result;
}
case Operator::AND: {
result = children_.at(0)->evaluate(leaves);
for (size_t i = 1; i < children_.size() && isNeeded(result); ++i) {
result = children_.at(i)->evaluate(leaves) && result;
}
return result;
}
case Operator::NOT:
return !children_.at(0)->evaluate(leaves);
case Operator::LEAF:
return leaves[leaf_];
case Operator::CONSTANT:
return constant_;
default:
throw std::invalid_argument("Unknown operator!");
}
}
std::string to_string(TruthValue truthValue) {
switch (truthValue) {
case TruthValue::YES:
return "YES";
case TruthValue::NO:
return "NO";
case TruthValue::IS_NULL:
return "IS_NULL";
case TruthValue::YES_NULL:
return "YES_NULL";
case TruthValue::NO_NULL:
return "NO_NULL";
case TruthValue::YES_NO:
return "YES_NO";
case TruthValue::YES_NO_NULL:
return "YES_NO_NULL";
default:
throw std::invalid_argument("unknown TruthValue!");
}
}
std::string ExpressionTree::toString() const {
std::ostringstream sstream;
switch (operator_) {
case Operator::OR:
sstream << "(or";
for (const auto& child : children_) {
sstream << ' ' << child->toString();
}
sstream << ')';
break;
case Operator::AND:
sstream << "(and";
for (const auto& child : children_) {
sstream << ' ' << child->toString();
}
sstream << ')';
break;
case Operator::NOT:
sstream << "(not " << children_.at(0)->toString() << ')';
break;
case Operator::LEAF:
sstream << "leaf-" << leaf_;
break;
case Operator::CONSTANT:
sstream << to_string(constant_);
break;
default:
throw std::invalid_argument("unknown operator!");
}
return sstream.str();
}
} // namespace orc
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