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// Copyright Yahoo. Licensed under the terms of the Apache 2.0 license. See LICENSE in the project root.
#pragma once
#include <vespa/vespalib/stllike/string.h>
#include <vector>
namespace search::features {
/**
* Utility for parsing a string representation of an array with values (numeric or string)
* that is typically passed down with the query.
*
* The format of the array is as follows:
* 1) Dense form: [value0 value1 ... valueN] (where value0 has index 0)
*
* 2) Sparse form: {idxA:valueA,idxB:valueB,...,idxN:valueN}.
* In the sparse form all non-specified indexes get the value 0.0 and
* has values for indexes in the range [0,max index specified].
* The parsed array is sorted in index order.
*/
class ArrayParser
{
public:
template <typename T>
class ValueAndIndex {
public:
using ValueType = T;
ValueAndIndex(T value, uint32_t index) noexcept : _value(value), _index(index) { }
T getValue() const { return _value; }
uint32_t getIndex() const { return _index; }
bool operator < (const ValueAndIndex & b) const { return _index < b._index; }
private:
T _value;
uint32_t _index;
};
template <typename OutputType, typename T = typename OutputType::value_type>
static void parse(const vespalib::string &input, OutputType &output);
static void parse(const vespalib::string &input, std::vector<int8_t> &output);
template <typename OutputType>
static void parsePartial(const vespalib::string &input, OutputType &output);
};
}
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