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ircd: Use intuitive semantics for the strip() suite.

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This commit is contained in:
Jason Volk 2018-01-20 06:58:49 -08:00
parent 63ddbf8fbe
commit 0912b5366a
1 changed files with 44 additions and 23 deletions
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67
include/ircd/stringops.h
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@ -44,15 +44,21 @@ namespace ircd
// wrapper to find(T) != npos
template<class T> bool has(const string_view &, const T &);
// return view without trailing c
string_view rstrip(const string_view &str, const char &c = ' ');
string_view rstrip(const string_view &str, const string_view &c);
// return view without any trailing characters contained in c
string_view rstripa(const string_view &str, const string_view &c);
// return view without leading c
// return view without any leading characters contained in c
string_view lstripa(const string_view &str, const string_view &c);
// return view without leading occurrences of c
string_view lstrip(const string_view &str, const char &c = ' ');
string_view lstrip(const string_view &str, const string_view &c);
string_view lstrip(string_view str, const string_view &c);
// return view without leading and trailing c
// return view without trailing occurrences of c
string_view rstrip(const string_view &str, const char &c = ' ');
string_view rstrip(string_view str, const string_view &c);
// return view without leading and trailing occurrences of c
string_view strip(const string_view &str, const char &c = ' ');
string_view strip(const string_view &str, const string_view &c);
@ -254,8 +260,7 @@ inline bool
ircd::startswith(const string_view &str,
const string_view &val)
{
const auto pos(str.find(val, 0));
return pos == 0;
return !str.empty() && str.substr(0, val.size()) == val;
}
/// Count occurrences of val at end of string
@ -293,9 +298,8 @@ inline bool
ircd::endswith(const string_view &str,
const string_view &val)
{
const auto vlen(std::min(str.size(), val.size()));
const auto pos(str.find(val, vlen));
return pos == str.size() - vlen;
const ssize_t off(str.size() - val.size());
return !str.empty() && off >= 0 && str.substr(off) == val;
}
/// View a string between the first match of a and the first match of b
@ -404,11 +408,13 @@ ircd::strip(const string_view &str,
/// Remove trailing instances of c from the returned view
inline ircd::string_view
ircd::rstrip(const string_view &str,
ircd::rstrip(string_view str,
const string_view &c)
{
const auto pos(str.find_last_not_of(c));
return pos != string_view::npos? string_view{str.substr(0, pos + 1)} : str;
while(endswith(str, c))
str = str.substr(0, size(str) - size(c));
return str;
}
/// Remove trailing instances of c from the returned view
@ -420,9 +426,18 @@ ircd::rstrip(const string_view &str,
return pos != string_view::npos? string_view{str.substr(0, pos + 1)} : str;
}
/// Remove leading instances of c from the returned view
inline ircd::string_view
ircd::lstrip(string_view str,
const string_view &c)
{
while(startswith(str, c))
str = str.substr(size(c));
return str;
}
/// Remove leading instances of c from the returned view.
/// Note in case the strip results in an empty view, we return a string_view
/// with the original pointer and size 0 so it carries through the defined().
inline ircd::string_view
ircd::lstrip(const string_view &str,
const char &c)
@ -432,16 +447,22 @@ ircd::lstrip(const string_view &str,
string_view{str.data(), size_t{0}};
}
/// Remove leading instances of c from the returned view
/// Note in case the strip results in an empty view, we return a string_view
/// with the original pointer and size 0 so it carries through the defined().
/// Remove leading instances of any character in c from the returned view
inline ircd::string_view
ircd::lstrip(const string_view &str,
const string_view &c)
ircd::lstripa(const string_view &str,
const string_view &c)
{
const auto pos(str.find_first_not_of(c));
return pos != string_view::npos? string_view{str.substr(pos)}:
string_view{str.data(), size_t{0}};
return pos != string_view::npos? string_view{str.substr(pos)} : str;
}
/// Remove trailing instances of any character in c from the returned view
inline ircd::string_view
ircd::rstripa(const string_view &str,
const string_view &c)
{
const auto pos(str.find_last_not_of(c));
return pos != string_view::npos? string_view{str.substr(0, pos + 1)} : str;
}
template<class T>