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#pragma once
#include <Functions/JSONPath/ASTs/ASTJSONPathRange.h>
#include <Functions/JSONPath/Generator/IVisitor.h>
#include <Functions/JSONPath/Generator/VisitorStatus.h>
namespace DB
{
template <typename JSONParser>
class VisitorJSONPathRange : public IVisitor<JSONParser>
{
public:
explicit VisitorJSONPathRange(ASTPtr range_ptr_) : range_ptr(range_ptr_->as<ASTJSONPathRange>())
{
current_range = 0;
current_index = range_ptr->ranges[current_range].first;
}
const char * getName() const override { return "VisitorJSONPathRange"; }
VisitorStatus apply(typename JSONParser::Element & element) const override
{
typename JSONParser::Array array = element.getArray();
element = array[current_index];
return VisitorStatus::Ok;
}
VisitorStatus visit(typename JSONParser::Element & element) override
{
if (!element.isArray())
{
this->setExhausted(true);
return VisitorStatus::Error;
}
VisitorStatus status;
if (current_index < element.getArray().size())
{
apply(element);
status = VisitorStatus::Ok;
}
else
{
status = VisitorStatus::Ignore;
}
if (current_index + 1 == range_ptr->ranges[current_range].second
&& current_range + 1 == range_ptr->ranges.size())
{
this->setExhausted(true);
}
return status;
}
void reinitialize() override
{
current_range = 0;
current_index = range_ptr->ranges[current_range].first;
this->setExhausted(false);
}
void updateState() override
{
current_index++;
if (current_index == range_ptr->ranges[current_range].second)
{
current_range++;
current_index = range_ptr->ranges[current_range].first;
}
}
private:
ASTJSONPathRange * range_ptr;
size_t current_range;
UInt32 current_index;
};
}
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