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ircd: Cleanup/simplify case-insensitive comparisons.

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This commit is contained in:
Jason Volk 2018-12-31 11:16:42 -08:00
parent 57079c0276
commit 1ceded5ffa
1 changed files with 125 additions and 183 deletions
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308
include/ircd/stringops.h
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@ -119,8 +119,15 @@ struct ircd::strlcpy
mutable_buffer ret;
public:
operator string_view() const { return ret; }
operator size_t() const { return size(ret); }
operator string_view() const
{
return ret;
}
operator size_t() const
{
return size(ret);
}
strlcpy(char *const &dst, const string_view &src, const size_t &max)
:ret{[&]() -> mutable_buffer
@ -153,8 +160,15 @@ struct ircd::strlcat
mutable_buffer ret;
public:
operator string_view() const { return ret; }
operator size_t() const { return size(ret); }
operator string_view() const
{
return ret;
}
operator size_t() const
{
return size(ret);
}
strlcat(char *const &dst, const string_view &src, const size_t &max)
:ret{[&]() -> mutable_buffer
@ -175,6 +189,113 @@ struct ircd::strlcat
{}
};
/// Case insensitive string comparison deciding if two strings are equal
struct ircd::iequals
{
using is_transparent = std::true_type;
bool s;
operator const bool &() const
{
return s;
}
bool operator()(const string_view &a, const string_view &b) const;
template<class A,
class B>
iequals(A&& a, B&& b)
:s{operator()(std::forward<A>(a), std::forward<B>(b))}
{}
iequals() = default;
};
inline bool
ircd::iequals::operator()(const string_view &a,
const string_view &b)
const
{
return std::equal(begin(a), end(a), begin(b), end(b), []
(const char &a, const char &b)
{
return tolower(a) == tolower(b);
});
}
/// Case insensitive string comparison deciding which string compares 'less'
/// than the other.
struct ircd::iless
{
using is_transparent = std::true_type;
bool s;
operator const bool &() const
{
return s;
}
bool operator()(const string_view &a, const string_view &b) const;
template<class A,
class B>
iless(A&& a, B&& b)
:s{operator()(std::forward<A>(a), std::forward<B>(b))}
{}
iless() = default;
};
inline bool
ircd::iless::operator()(const string_view &a,
const string_view &b)
const
{
return std::lexicographical_compare(begin(a), end(a), begin(b), end(b), []
(const char &a, const char &b)
{
return tolower(a) < tolower(b);
});
}
/// Case insensitive string comparison deciding which string compares 'greater'
/// than the other.
struct ircd::igreater
{
using is_transparent = std::true_type;
bool s;
operator const bool &() const
{
return s;
}
bool operator()(const string_view &a, const string_view &b) const;
template<class A,
class B>
igreater(A&& a, B&& b)
:s{operator()(std::forward<A>(a), std::forward<B>(b))}
{}
igreater() = default;
};
inline bool
ircd::igreater::operator()(const string_view &a,
const string_view &b)
const
{
return std::lexicographical_compare(begin(a), end(a), begin(b), end(b), []
(const char &a, const char &b)
{
return tolower(a) > tolower(b);
});
}
inline ircd::string_view
ircd::trunc(const string_view &s,
const size_t &max)
@ -591,182 +712,3 @@ ircd::has(const string_view &s,
{
return s.find(t) != s.npos;
}
/// Case insensitive string comparison deciding which string compares 'less'
/// than the other.
struct ircd::iless
{
using is_transparent = std::true_type;
bool s;
operator const bool &() const { return s; }
bool operator()(const string_view &a, const string_view &b) const;
bool operator()(const string_view &a, const std::string &b) const;
bool operator()(const std::string &a, const string_view &b) const;
bool operator()(const std::string &a, const std::string &b) const;
template<class A,
class B>
iless(A&& a, B&& b)
:s{operator()(std::forward<A>(a), std::forward<B>(b))}
{}
iless() = default;
};
inline bool
ircd::iless::operator()(const std::string &a,
const std::string &b)
const
{
return operator()(string_view{a}, string_view{b});
}
inline bool
ircd::iless::operator()(const string_view &a,
const std::string &b)
const
{
return operator()(a, string_view{b});
}
inline bool
ircd::iless::operator()(const std::string &a,
const string_view &b)
const
{
return operator()(string_view{a}, b);
}
inline bool
ircd::iless::operator()(const string_view &a,
const string_view &b)
const
{
return std::lexicographical_compare(begin(a), end(a), begin(b), end(b), []
(const char &a, const char &b)
{
return tolower(a) < tolower(b);
});
}
/// Case insensitive string comparison deciding if two strings are equal
struct ircd::iequals
{
using is_transparent = std::true_type;
bool s;
operator const bool &() const { return s; }
bool operator()(const string_view &a, const string_view &b) const;
bool operator()(const string_view &a, const std::string &b) const;
bool operator()(const std::string &a, const string_view &b) const;
bool operator()(const std::string &a, const std::string &b) const;
template<class A,
class B>
iequals(A&& a, B&& b)
:s{operator()(std::forward<A>(a), std::forward<B>(b))}
{}
iequals() = default;
};
inline bool
ircd::iequals::operator()(const std::string &a,
const std::string &b)
const
{
return operator()(string_view{a}, string_view{b});
}
inline bool
ircd::iequals::operator()(const string_view &a,
const std::string &b)
const
{
return operator()(a, string_view{b});
}
inline bool
ircd::iequals::operator()(const std::string &a,
const string_view &b)
const
{
return operator()(string_view{a}, b);
}
inline bool
ircd::iequals::operator()(const string_view &a,
const string_view &b)
const
{
return std::equal(begin(a), end(a), begin(b), end(b), []
(const char &a, const char &b)
{
return tolower(a) == tolower(b);
});
}
/// Case insensitive string comparison deciding which string compares 'greater'
/// than the other.
struct ircd::igreater
{
using is_transparent = std::true_type;
bool s;
operator const bool &() const { return s; }
bool operator()(const string_view &a, const string_view &b) const;
bool operator()(const string_view &a, const std::string &b) const;
bool operator()(const std::string &a, const string_view &b) const;
bool operator()(const std::string &a, const std::string &b) const;
template<class A,
class B>
igreater(A&& a, B&& b)
:s{operator()(std::forward<A>(a), std::forward<B>(b))}
{}
igreater() = default;
};
inline bool
ircd::igreater::operator()(const std::string &a,
const std::string &b)
const
{
return operator()(string_view{a}, string_view{b});
}
inline bool
ircd::igreater::operator()(const string_view &a,
const std::string &b)
const
{
return operator()(a, string_view{b});
}
inline bool
ircd::igreater::operator()(const std::string &a,
const string_view &b)
const
{
return operator()(string_view{a}, b);
}
inline bool
ircd::igreater::operator()(const string_view &a,
const string_view &b)
const
{
return std::lexicographical_compare(begin(a), end(a), begin(b), end(b), []
(const char &a, const char &b)
{
return tolower(a) > tolower(b);
});
}