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// Copyright Vespa.ai. Licensed under the terms of the Apache 2.0 license. See LICENSE in the project root.
/**
* @class document::select::ValueNode
* @ingroup select
*
* @brief Node representing a value in the tree
*
* @author Håkon Humberset
*/
#pragma once
#include "value.h"
#include "parser_limits.h"
namespace document::select {
class Context;
class Visitor;
class ValueNode : public Printable
{
public:
using UP = std::unique_ptr<ValueNode>;
explicit ValueNode(uint32_t max_depth)
: _max_depth(max_depth), _parentheses(false)
{
throw_parse_error_if_max_depth_exceeded();
}
ValueNode() : _max_depth(1), _parentheses(false) {}
~ValueNode() override = default;
// See comments for same function in node.h for a description on how and why
// we track this. Since Node and ValueNode live in completely separate type
// hierarchies, this particular bit of code duplication is unfortunate but
// incurs the least cognitive overhead.
[[nodiscard]] uint32_t max_depth() const noexcept { return _max_depth; }
void setParentheses() { _parentheses = true; }
void clearParentheses() { _parentheses = false; }
bool hadParentheses() const { return _parentheses; }
virtual std::unique_ptr<Value> getValue(const Context& context) const = 0;
virtual void visit(Visitor&) const = 0;
virtual ValueNode::UP clone() const = 0;
virtual std::unique_ptr<Value> traceValue(const Context &context, std::ostream &out) const;
private:
uint32_t _max_depth;
bool _parentheses; // Set to true if parentheses was used around this part
// Set such that we can recreate original query in print.
protected:
void throw_parse_error_if_max_depth_exceeded() const {
if (_max_depth > ParserLimits::MaxRecursionDepth) {
throw_max_depth_exceeded_exception();
}
}
std::unique_ptr<ValueNode> wrapParens(std::unique_ptr<ValueNode> node) const {
if (_parentheses) {
node->setParentheses();
}
return node;
}
std::unique_ptr<Value> defaultTrace(std::unique_ptr<Value> val, std::ostream& out) const;
};
}
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