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AK: Add more StringView utilities for making substrings.

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These two allow making a new substring view starting from,
or starting after, an existing substring view.

Also make use of one of them in the kernel.
This commit is contained in:
Sergey Bugaev 2019-06-13 16:30:55 +03:00 • committed by Andreas Kling
parent 3e326de8fa
commit 1a697f70db
3 changed files with 38 additions and 4 deletions
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19
AK/StringView.h
View file

@ -40,6 +40,25 @@ public:
Vector<StringView> split_view(char) const;
unsigned to_uint(bool& ok) const;
// Create a new substring view of this string view, starting either at the beginning of
// the given substring view, or after its end, and continuing until the end of this string
// view (that is, for the remaining part of its length). For example,
//
// StringView str { "foobar" };
// StringView substr = str.substring_view(1, 2); // "oo"
// StringView substr_from = str.substring_view_starting_from_substring(subst); // "oobar"
// StringView substr_after = str.substring_view_starting_after_substring(subst); // "bar"
//
// Note that this only works if the string view passed as an argument is indeed a substring
// view of this string view, such as one created by substring_view() and split_view(). It
// does not work for arbitrary strings; for example declaring substr in the example above as
//
// StringView substr { "oo" };
//
// would not work.
StringView substring_view_starting_from_substring(const StringView& substring) const;
StringView substring_view_starting_after_substring(const StringView& substring) const;
bool operator==(const char* cstring) const
{
if (is_null())