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util/StringView: add method SplitLast()

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This commit is contained in:
Max Kellermann 2020-11-30 22:29:32 +01:00
parent d547ace749
commit ab53c414bc
1 changed files with 16 additions and 1 deletions
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17
src/util/StringView.hxx
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@ -1,5 +1,5 @@
/* /*
* Copyright 2013-2019 Max Kellermann <max.kellermann@gmail.com> * Copyright 2013-2020 Max Kellermann <max.kellermann@gmail.com>
* *
* Redistribution and use in source and binary forms, with or without * Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions * modification, are permitted provided that the following conditions
@ -35,6 +35,7 @@
#include "Compiler.h" #include "Compiler.h"
#include <utility> #include <utility>
#include <cstddef>
#if __cplusplus >= 201703L && !GCC_OLDER_THAN(7,0) #if __cplusplus >= 201703L && !GCC_OLDER_THAN(7,0)
#include <string_view> #include <string_view>
@ -126,6 +127,20 @@ struct BasicStringView : ConstBuffer<T> {
return {{begin(), separator}, {separator + 1, end()}}; return {{begin(), separator}, {separator + 1, end()}};
} }
/**
* Split the string at the last occurrence of the given
* character. If the character is not found, then the first
* value is the whole string and the second value is nullptr.
*/
gcc_pure
std::pair<BasicStringView<T>, BasicStringView<T>> SplitLast(value_type ch) const noexcept {
const auto separator = FindLast(ch);
if (separator == nullptr)
return {*this, nullptr};
return {{begin(), separator}, {separator + 1, end()}};
}
gcc_pure gcc_pure
bool StartsWith(BasicStringView<T> needle) const noexcept { bool StartsWith(BasicStringView<T> needle) const noexcept {
return this->size >= needle.size && return this->size >= needle.size &&