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util/StringView: add method Split()

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Max Kellermann
2019-06-06 12:15:50 +02:00
parent c1719a5200
commit 76eb550011
1 changed files with 19 additions and 1 deletions
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20
src/util/StringView.hxx
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@@ -1,5 +1,5 @@
/* /*
* Copyright (C) 2013-2017 Max Kellermann <max.kellermann@gmail.com> * Copyright 2013-2019 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
@@ -33,6 +33,8 @@
#include "ConstBuffer.hxx" #include "ConstBuffer.hxx"
#include "StringAPI.hxx" #include "StringAPI.hxx"
#include <utility>
template<typename T> template<typename T>
struct BasicStringView : ConstBuffer<T> { struct BasicStringView : ConstBuffer<T> {
typedef typename ConstBuffer<T>::size_type size_type; typedef typename ConstBuffer<T>::size_type size_type;
@@ -65,6 +67,8 @@ struct BasicStringView : ConstBuffer<T> {
:ConstBuffer<T>(n) {} :ConstBuffer<T>(n) {}
using ConstBuffer<T>::empty; using ConstBuffer<T>::empty;
using ConstBuffer<T>::begin;
using ConstBuffer<T>::end;
using ConstBuffer<T>::front; using ConstBuffer<T>::front;
using ConstBuffer<T>::back; using ConstBuffer<T>::back;
using ConstBuffer<T>::pop_front; using ConstBuffer<T>::pop_front;
@@ -76,6 +80,20 @@ struct BasicStringView : ConstBuffer<T> {
return StringFind(data, ch, this->size); return StringFind(data, ch, this->size);
} }
/**
* Split the string at the first 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>> Split(value_type ch) const noexcept {
const auto separator = Find(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 &&