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/* Distributed under the OSI-approved BSD 3-Clause License. See accompanying
file Copyright.txt or https://cmake.org/licensing for details. */
#pragma once
#include "cmConfigure.h" // IWYU pragma: keep
#include <cstddef>
#include <iosfwd>
#include <string>
#include <cm/string_view>
class cmValue
{
public:
cmValue() noexcept = default;
cmValue(std::nullptr_t) noexcept {}
explicit cmValue(const std::string* value) noexcept
: Value(value)
{
}
explicit cmValue(const std::string& value) noexcept
: Value(&value)
{
}
cmValue(const cmValue& other) noexcept = default;
cmValue& operator=(const cmValue& other) noexcept = default;
cmValue& operator=(std::nullptr_t) noexcept
{
this->Value = nullptr;
return *this;
}
const std::string* Get() const noexcept { return this->Value; }
const char* GetCStr() const noexcept
{
return this->Value == nullptr ? nullptr : this->Value->c_str();
}
const std::string* operator->() const noexcept
{
return this->Value == nullptr ? &cmValue::Empty : this->Value;
}
const std::string& operator*() const noexcept
{
return this->Value == nullptr ? cmValue::Empty : *this->Value;
}
explicit operator bool() const noexcept { return this->Value != nullptr; }
operator const std::string&() const noexcept { return this->operator*(); }
explicit operator cm::string_view() const noexcept
{
return this->operator*();
}
/**
* Does the value indicate a true or ON value?
*/
bool IsOn() const noexcept
{
return this->Value != nullptr &&
cmValue::IsOn(cm::string_view(*this->Value));
}
/**
* Does the value indicate a false or off value ? Note that this is
* not the same as !IsOn(...) because there are a number of
* ambiguous values such as "/usr/local/bin" a path will result in
* IsOn and IsOff both returning false. Note that the special path
* NOTFOUND, *-NOTFOUND or IGNORE will cause IsOff to return true.
*/
bool IsOff() const noexcept
{
return this->Value == nullptr ||
cmValue::IsOff(cm::string_view(*this->Value));
}
/** Return true if value is NOTFOUND or ends in -NOTFOUND. */
bool IsNOTFOUND() const noexcept
{
return this->Value != nullptr &&
cmValue::IsNOTFOUND(cm::string_view(*this->Value));
}
bool IsEmpty() const noexcept
{
return this->Value == nullptr || this->Value->empty();
}
bool IsSet() const noexcept
{
return !this->IsEmpty() && !this->IsNOTFOUND();
}
/**
* Does a string indicate a true or ON value?
*/
static bool IsOn(const char* value) noexcept
{
return value != nullptr && IsOn(cm::string_view(value));
}
static bool IsOn(cm::string_view) noexcept;
/**
* Compare method has same semantic as std::optional::compare
*/
int Compare(cmValue value) const noexcept;
int Compare(cm::string_view value) const noexcept;
/**
* Does a string indicate a false or off value ? Note that this is
* not the same as !IsOn(...) because there are a number of
* ambiguous values such as "/usr/local/bin" a path will result in
* IsOn and IsOff both returning false. Note that the special path
* NOTFOUND, *-NOTFOUND or IGNORE will cause IsOff to return true.
*/
static bool IsOff(const char* value) noexcept
{
return value == nullptr || IsOff(cm::string_view(value));
}
static bool IsOff(cm::string_view) noexcept;
/** Return true if value is NOTFOUND or ends in -NOTFOUND. */
static bool IsNOTFOUND(const char* value) noexcept
{
return value == nullptr || IsNOTFOUND(cm::string_view(value));
}
static bool IsNOTFOUND(cm::string_view) noexcept;
static bool IsEmpty(const char* value) noexcept
{
return value == nullptr || *value == '\0';
}
static bool IsEmpty(cm::string_view value) noexcept { return value.empty(); }
private:
static std::string Empty;
const std::string* Value = nullptr;
};
std::ostream& operator<<(std::ostream& o, cmValue v);
inline bool operator==(cmValue l, cmValue r) noexcept
{
return l.Compare(r) == 0;
}
inline bool operator!=(cmValue l, cmValue r) noexcept
{
return l.Compare(r) != 0;
}
inline bool operator<(cmValue l, cmValue r) noexcept
{
return l.Compare(r) < 0;
}
inline bool operator<=(cmValue l, cmValue r) noexcept
{
return l.Compare(r) <= 0;
}
inline bool operator>(cmValue l, cmValue r) noexcept
{
return l.Compare(r) > 0;
}
inline bool operator>=(cmValue l, cmValue r) noexcept
{
return l.Compare(r) >= 0;
}
inline bool operator==(cmValue l, cm::string_view r) noexcept
{
return l.Compare(r) == 0;
}
inline bool operator!=(cmValue l, cm::string_view r) noexcept
{
return l.Compare(r) != 0;
}
inline bool operator<(cmValue l, cm::string_view r) noexcept
{
return l.Compare(r) < 0;
}
inline bool operator<=(cmValue l, cm::string_view r) noexcept
{
return l.Compare(r) <= 0;
}
inline bool operator>(cmValue l, cm::string_view r) noexcept
{
return l.Compare(r) > 0;
}
inline bool operator>=(cmValue l, cm::string_view r) noexcept
{
return l.Compare(r) >= 0;
}
inline bool operator==(cmValue l, std::nullptr_t) noexcept
{
return l.Compare(cmValue{}) == 0;
}
inline bool operator!=(cmValue l, std::nullptr_t) noexcept
{
return l.Compare(cmValue{}) != 0;
}
inline bool operator<(cmValue l, std::nullptr_t) noexcept
{
return l.Compare(cmValue{}) < 0;
}
inline bool operator<=(cmValue l, std::nullptr_t) noexcept
{
return l.Compare(cmValue{}) <= 0;
}
inline bool operator>(cmValue l, std::nullptr_t) noexcept
{
return l.Compare(cmValue{}) > 0;
}
inline bool operator>=(cmValue l, std::nullptr_t) noexcept
{
return l.Compare(cmValue{}) >= 0;
}
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