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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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18
AK/StringView.cpp
View file

@ -42,6 +42,24 @@ StringView StringView::substring_view(int start, int length) const
return { m_characters + start, length };
}
StringView StringView::substring_view_starting_from_substring(const StringView& substring) const
{
const char* remaining_characters = substring.characters();
ASSERT(remaining_characters >= m_characters);
ASSERT(remaining_characters <= m_characters + m_length);
int remaining_length = m_length - (remaining_characters - m_characters);
return { remaining_characters, remaining_length };
}
StringView StringView::substring_view_starting_after_substring(const StringView& substring) const
{
const char* remaining_characters = substring.characters() + substring.length();
ASSERT(remaining_characters >= m_characters);
ASSERT(remaining_characters <= m_characters + m_length);
int remaining_length = m_length - (remaining_characters - m_characters);
return { remaining_characters, remaining_length };
}
unsigned StringView::to_uint(bool& ok) const
{
unsigned value = 0;