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AK: Add StringView::to_int()

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This is a shameless copy-paste of String::to_int(). We should find some
way to share this code between String and StringView instead of having
two duplicate copies like this.
This commit is contained in:
Andreas Kling 2019-08-04 11:44:20 +02:00
parent c55129e573
commit cce2ea9bb0
3 changed files with 32 additions and 0 deletions
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1
AK/AKString.h
View file

@ -92,6 +92,7 @@ public:
static String repeated(char, int count);
bool matches(const StringView& pattern, CaseSensitivity = CaseSensitivity::CaseInsensitive) const;
// FIXME: These should be shared between String and StringView somehow!
int to_int(bool& ok) const;
unsigned to_uint(bool& ok) const;

28
AK/StringView.cpp
View file

@ -66,6 +66,34 @@ StringView StringView::substring_view_starting_after_substring(const StringView&
return { remaining_characters, remaining_length };
}
int StringView::to_int(bool& ok) const
{
bool negative = false;
int value = 0;
int i = 0;
if (is_empty()) {
ok = false;
return 0;
}
if (characters_without_null_termination()[0] == '-') {
i++;
negative = true;
}
for (; i < length(); i++) {
if (characters_without_null_termination()[i] < '0' || characters_without_null_termination()[i] > '9') {
ok = false;
return 0;
}
value = value * 10;
value += characters_without_null_termination()[i] - '0';
}
ok = true;
return negative ? -value : value;
}
unsigned StringView::to_uint(bool& ok) const
{
unsigned value = 0;

3
AK/StringView.h
View file

@ -41,7 +41,10 @@ public:
StringView substring_view(int start, int length) const;
Vector<StringView> split_view(char) const;
// FIXME: These should be shared between String and StringView somehow!
unsigned to_uint(bool& ok) const;
int to_int(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