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refactoring for readability

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This commit is contained in:
Kindi 2023-09-03 19:20:59 +08:00
parent 8798217b51
commit 7eb456a169
1 changed files with 21 additions and 7 deletions
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28
components/lua/utf8.cpp
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@ -28,6 +28,9 @@ namespace
return integer;
}
// If the input 'pos' is negative, it is treated as counting from the end of the string,
// where -1 represents the last character position, -2 represents the second-to-last position,
// and so on. If 'pos' is non-negative, it is used as-is.
inline void relativePosition(int64_t& pos, const size_t len)
{
if (pos < 0)
@ -181,7 +184,18 @@ namespace LuaUtf8
utf8["offset"]
= [](std::string_view s, const int64_t n, const sol::variadic_args args) -> sol::optional<int64_t> {
size_t len = s.size();
int64_t iv = isNilOrNone(args[0]) ? ((n >= 0) ? 1 : s.size() + 1) : getInteger(args[0], 3, "offset");
int64_t iv;
if (isNilOrNone(args[0]))
{
if (n >= 0)
iv = 1;
else
iv = s.size() + 1;
}
else
iv = getInteger(args[0], 3, "offset");
std::vector<int64_t> pos_byte = { 1 };
relativePosition(iv, len);
@ -193,14 +207,13 @@ namespace LuaUtf8
decodeNextUTF8Character(s, pos_byte);
for (auto it = pos_byte.begin(); it != pos_byte.end(); ++it)
{
if (*it == iv)
{
if (n <= 0)
if ((it + n) >= pos_byte.begin())
return *(it + n);
if (n > 0)
if ((it + n - 1) < pos_byte.end())
return *(it + n - 1);
if (n <= 0 && it + n >= pos_byte.begin())
return *(it + n);
if (n > 0 && it + n - 1 < pos_byte.end())
return *(it + n - 1);
break;
}
else if (*it > iv) /* a continuation byte */
@ -210,6 +223,7 @@ namespace LuaUtf8
else
throw std::runtime_error("initial position is a continuation byte");
}
}
return sol::nullopt;
};