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// Copyright Vespa.ai. Licensed under the terms of the Apache 2.0 license. See LICENSE in the project root.
#pragma once
#include "parse.h"
#include <vespa/searchlib/query/tree/predicate_query_term.h>
#include <vespa/vespalib/stllike/string.h>
namespace search {
/**
* An iterator to be used on a buffer that is a stack dump
* of a SimpleQueryStack.
*/
class SimpleQueryStackDumpIterator
{
private:
/** Pointer to the start of the input buffer */
const char *_buf;
/** Pointer to just past the input buffer */
const char *_bufEnd;
/** Pointer to the position of the current item in the buffer */
uint32_t _currPos;
/** Pointer to after the current item */
uint32_t _currEnd;
/** The type of the current item */
ParseItem::ItemType _currType;
/** flags of the current item **/
uint8_t _currFlags;
/** Rank weight of current item **/
query::Weight _currWeight;
/** unique id of the current item **/
uint32_t _currUniqueId;
/** The arity of the current item */
uint32_t _currArity;
/** The index name (field name) in the current item */
vespalib::stringref _curr_index_name;
/** The term in the current item */
vespalib::stringref _curr_term;
int64_t _curr_integer_term;
/* extra arguments */
uint32_t _extraIntArg1;
uint32_t _extraIntArg2;
uint32_t _extraIntArg3;
double _extraDoubleArg4;
double _extraDoubleArg5;
/** The predicate query specification */
query::PredicateQueryTerm::UP _predicate_query_term;
VESPA_DLL_LOCAL vespalib::stringref read_stringref(const char *&p);
VESPA_DLL_LOCAL uint64_t readCompressedPositiveInt(const char *&p);
VESPA_DLL_LOCAL bool readPredicate(const char *&p);
VESPA_DLL_LOCAL bool readNN(const char *&p);
VESPA_DLL_LOCAL bool readComplexTerm(const char *& p);
VESPA_DLL_LOCAL bool readFuzzy(const char *&p);
VESPA_DLL_LOCAL bool readNext();
public:
/**
* Make an iterator on a buffer. To get the first item, next must be called.
*/
explicit SimpleQueryStackDumpIterator(vespalib::stringref buf);
SimpleQueryStackDumpIterator(const SimpleQueryStackDumpIterator &) = delete;
SimpleQueryStackDumpIterator& operator=(const SimpleQueryStackDumpIterator &) = delete;
~SimpleQueryStackDumpIterator();
vespalib::stringref getStack() const noexcept { return vespalib::stringref(_buf, _bufEnd - _buf); }
size_t getPosition() const { return _currPos; }
/**
* Moves to the next item in the buffer.
*
* @return true if there is a new item, false if there are no more items
* or if there was errors in extracting the next item.
*/
bool next();
/**
* Get the type of the current item.
* @return the type.
*/
ParseItem::ItemType getType() const { return _currType; }
/**
* Get the type of the current item.
* @return the type.
*/
ParseItem::ItemCreator getCreator() const { return ParseItem::GetCreator(_currFlags); }
/**
* Get the rank weight of the current item.
*
* @return rank weight.
**/
query::Weight GetWeight() const { return _currWeight; }
/**
* Get the unique id of the current item.
*
* @return unique id of current item
**/
uint32_t getUniqueId() const { return _currUniqueId; }
// Get the flags of the current item.
bool hasNoRankFlag() const { return (_currFlags & ParseItem::IFLAG_NORANK) != 0; }
bool hasSpecialTokenFlag() const { return (_currFlags & ParseItem::IFLAG_SPECIALTOKEN) != 0; }
bool hasNoPositionDataFlag() const { return (_currFlags & ParseItem::IFLAG_NOPOSITIONDATA) != 0; }
uint32_t getArity() const { return _currArity; }
uint32_t getNearDistance() const { return _extraIntArg1; }
uint32_t getTargetHits() const { return _extraIntArg1; }
double getDistanceThreshold() const { return _extraDoubleArg4; }
double getScoreThreshold() const { return _extraDoubleArg4; }
double getThresholdBoostFactor() const { return _extraDoubleArg5; }
bool getAllowApproximate() const { return (_extraIntArg2 != 0); }
uint32_t getExploreAdditionalHits() const { return _extraIntArg3; }
// fuzzy match arguments
uint32_t getFuzzyMaxEditDistance() const { return _extraIntArg1; }
uint32_t getFuzzyPrefixLength() const { return _extraIntArg2; }
query::PredicateQueryTerm::UP getPredicateQueryTerm() { return std::move(_predicate_query_term); }
vespalib::stringref getIndexName() const { return _curr_index_name; }
vespalib::stringref getTerm() const { return _curr_term; }
int64_t getIntergerTerm() const { return _curr_integer_term; }
};
}
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