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// Copyright The OpenTelemetry Authors
// SPDX-License-Identifier: Apache-2.0
#pragma once
#include "opentelemetry/nostd/string_view.h"
/** DJB2 hash function below is near-perfect hash used by several systems.
* Ref. http://www.cse.yorku.ca/~oz/hash.html
* </summary>
* <param name="str">String to hash</param>
* <param name="h">Initial offset</param>
* <returns>32 bit code</returns>
*/
constexpr uint32_t hashCode(const char *str, uint32_t h = 0)
{
return (uint32_t)(!str[h] ? 5381 : ((uint32_t)hashCode(str, h + 1) * (uint32_t)33) ^ str[h]);
}
#define OTEL_CPP_CONST_UINT32_T(x) std::integral_constant<uint32_t, (uint32_t)x>::value
#define OTEL_CPP_CONST_HASHCODE(name) OTEL_CPP_CONST_UINT32_T(hashCode(#name))
OPENTELEMETRY_BEGIN_NAMESPACE
namespace common
{
class StringUtil
{
public:
static nostd::string_view Trim(nostd::string_view str, size_t left, size_t right) noexcept
{
while (str[static_cast<std::size_t>(left)] == ' ' && left <= right)
{
left++;
}
while (str[static_cast<std::size_t>(right)] == ' ' && left <= right)
{
right--;
}
return str.substr(left, 1 + right - left);
}
static nostd::string_view Trim(nostd::string_view str) noexcept
{
if (str.empty())
{
return str;
}
return Trim(str, 0, str.size() - 1);
}
};
} // namespace common
OPENTELEMETRY_END_NAMESPACE
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