571 lines
14 KiB
C++
571 lines
14 KiB
C++
#include "string.hh"
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#include "exception.hh"
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#include "containers.hh"
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#include "utf8_iterator.hh"
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#include "unit_tests.hh"
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#include <cstdio>
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namespace Kakoune
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{
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String::Data::Data(const char* data, size_t size, size_t capacity)
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{
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if (capacity > Short::capacity)
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{
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if (capacity & 1)
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++capacity;
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l.ptr = Alloc{}.allocate(capacity+1);
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l.size = size;
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l.capacity = capacity;
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memcpy(l.ptr, data, size);
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l.ptr[size] = 0;
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}
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else
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set_short(data, size);
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}
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String::Data::Data(Data&& other) noexcept
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{
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if (other.is_long())
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{
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l = other.l;
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other.s.size = 1;
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}
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else
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s = other.s;
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}
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String::Data& String::Data::operator=(const Data& other)
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{
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const size_t new_size = other.size();
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reserve<false>(new_size);
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memcpy(data(), other.data(), new_size+1);
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set_size(new_size);
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return *this;
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}
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String::Data& String::Data::operator=(Data&& other) noexcept
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{
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if (other.is_long())
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{
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l = other.l;
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other.set_empty();
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}
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else
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s = other.s;
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return *this;
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}
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template<bool copy>
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void String::Data::reserve(size_t new_capacity)
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{
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if (new_capacity <= capacity())
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return;
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if (is_long())
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new_capacity = std::max(l.capacity * 2, new_capacity);
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char* new_ptr = Alloc{}.allocate(new_capacity+1);
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if (copy)
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{
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memcpy(new_ptr, data(), size()+1);
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l.size = size();
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}
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release();
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l.ptr = new_ptr;
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l.capacity = new_capacity;
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}
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template void String::Data::reserve<true>(size_t);
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template void String::Data::reserve<false>(size_t);
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void String::Data::force_size(size_t new_size)
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{
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reserve<false>(new_size);
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set_size(new_size);
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}
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void String::Data::append(const char* str, size_t len)
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{
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const size_t new_size = size() + len;
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reserve(new_size);
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memcpy(data() + size(), str, len);
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set_size(new_size);
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data()[new_size] = 0;
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}
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void String::Data::clear()
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{
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release();
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set_empty();
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}
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void String::Data::release()
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{
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if (is_long())
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Alloc{}.deallocate(l.ptr, l.capacity+1);
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}
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void String::resize(ByteCount size, char c)
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{
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const size_t target_size = (size_t)size;
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const size_t current_size = m_data.size();
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if (target_size < current_size)
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m_data.set_size(target_size);
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else if (target_size > current_size)
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{
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m_data.reserve(target_size);
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m_data.set_size(target_size);
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for (auto i = current_size; i < target_size; ++i)
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m_data.data()[i] = c;
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}
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}
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void String::Data::set_size(size_t size)
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{
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if (is_long())
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l.size = size;
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else
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s.size = (size << 1) | 1;
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}
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void String::Data::set_short(const char* data, size_t size)
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{
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s.size = (size << 1) | 1;
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memcpy(s.string, data, size);
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s.string[size] = 0;
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}
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const String String::ms_empty;
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Vector<String> split(StringView str, char separator, char escape)
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{
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Vector<String> res;
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auto it = str.begin();
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auto start = it;
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while (it != str.end())
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{
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res.emplace_back();
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String& element = res.back();
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while (it != str.end())
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{
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auto c = *it;
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if (c == escape and it + 1 != str.end() and *(it+1) == separator)
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{
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element += StringView{start, it+1};
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element.back() = separator;
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it += 2;
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start = it;
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}
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else if (c == separator)
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{
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element += StringView{start, it};
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++it;
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start = it;
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break;
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}
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else
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++it;
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}
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}
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if (start != str.end())
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res.back() += StringView{start, str.end()};
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return res;
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}
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Vector<StringView> split(StringView str, char separator)
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{
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Vector<StringView> res;
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if (str.empty())
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return res;
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auto beg = str.begin();
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for (auto it = beg; it != str.end(); ++it)
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{
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if (*it == separator)
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{
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res.emplace_back(beg, it);
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beg = it + 1;
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}
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}
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res.emplace_back(beg, str.end());
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return res;
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}
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String escape(StringView str, StringView characters, char escape)
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{
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String res;
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res.reserve(str.length());
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for (auto it = str.begin(), end = str.end(); it != end; )
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{
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auto next = std::find_if(it, end, [&characters](char c) { return contains(characters, c); });
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if (next != end)
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{
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res += StringView{it, next+1};
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res.back() = escape;
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res += *next;
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it = next+1;
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}
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else
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{
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res += StringView{it, next};
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break;
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}
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}
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return res;
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}
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String unescape(StringView str, StringView characters, char escape)
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{
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String res;
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res.reserve(str.length());
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for (auto it = str.begin(), end = str.end(); it != end; )
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{
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auto next = std::find(it, end, escape);
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if (next != end and next+1 != end and contains(characters, *(next+1)))
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{
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res += StringView{it, next+1};
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res.back() = *(next+1);
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it = next + 2;
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}
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else
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{
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res += StringView{it, next == end ? next : next + 1};
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it = next == end ? next : next + 1;
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}
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}
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return res;
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}
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String indent(StringView str, StringView indent)
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{
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String res;
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res.reserve(str.length());
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bool was_eol = true;
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for (ByteCount i = 0; i < str.length(); ++i)
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{
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if (was_eol)
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res += indent;
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res += str[i];
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was_eol = is_eol(str[i]);
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}
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return res;
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}
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String replace(StringView str, StringView substr, StringView replacement)
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{
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String res;
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for (auto it = str.begin(); it != str.end(); )
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{
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auto match = std::search(it, str.end(), substr.begin(), substr.end());
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res += StringView{it, match};
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if (match == str.end())
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break;
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res += replacement;
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it = match + (int)substr.length();
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}
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return res;
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}
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Optional<int> str_to_int_ifp(StringView str)
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{
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unsigned int res = 0;
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bool negative = false;
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for (auto it = str.begin(), end = str.end(); it != end; ++it)
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{
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const char c = *it;
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if (it == str.begin() and c == '-')
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negative = true;
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else if (c >= '0' and c <= '9')
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res = res * 10 + c - '0';
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else
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return {};
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}
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return negative ? -(int)res : (int)res;
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}
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int str_to_int(StringView str)
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{
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if (auto val = str_to_int_ifp(str))
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return *val;
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throw runtime_error{str + " is not a number"};
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}
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InplaceString<15> to_string(int val)
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{
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InplaceString<15> res;
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res.m_length = sprintf(res.m_data, "%i", val);
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return res;
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}
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InplaceString<23> to_string(long int val)
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{
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InplaceString<23> res;
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res.m_length = sprintf(res.m_data, "%li", val);
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return res;
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}
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InplaceString<23> to_string(size_t val)
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{
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InplaceString<23> res;
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res.m_length = sprintf(res.m_data, "%zu", val);
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return res;
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}
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InplaceString<23> to_string(Hex val)
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{
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InplaceString<23> res;
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res.m_length = sprintf(res.m_data, "%zx", val.val);
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return res;
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}
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InplaceString<23> to_string(float val)
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{
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InplaceString<23> res;
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res.m_length = sprintf(res.m_data, "%f", val);
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return res;
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}
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InplaceString<7> to_string(Codepoint c)
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{
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InplaceString<7> res;
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char* ptr = res.m_data;
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utf8::dump(ptr, c);
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res.m_length = (int)(ptr - res.m_data);
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return res;
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}
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bool subsequence_match(StringView str, StringView subseq)
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{
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auto it = str.begin();
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for (auto& c : subseq)
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{
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if (it == str.end())
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return false;
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while (*it != c)
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{
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if (++it == str.end())
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return false;
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}
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++it;
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}
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return true;
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}
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String expand_tabs(StringView line, CharCount tabstop, CharCount col)
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{
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String res;
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res.reserve(line.length());
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for (auto it = line.begin(), end = line.end(); it != end; )
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{
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if (*it == '\t')
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{
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CharCount end_col = (col / tabstop + 1) * tabstop;
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res += String{' ', end_col - col};
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col = end_col;
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++it;
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}
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else
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{
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auto char_end = utf8::next(it, end);
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res += {it, char_end};
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++col;
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it = char_end;
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}
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}
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return res;
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}
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Vector<StringView> wrap_lines(StringView text, CharCount max_width)
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{
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if (max_width <= 0)
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throw runtime_error("Invalid max width");
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using Utf8It = utf8::iterator<const char*>;
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Utf8It it{text.begin(), text};
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Utf8It end{text.end(), text};
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Utf8It line_begin = it;
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Utf8It last_word_end = it;
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Vector<StringView> lines;
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while (it != end)
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{
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const CharCategories cat = categorize(*it);
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if (cat == CharCategories::EndOfLine)
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{
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lines.emplace_back(line_begin.base(), it.base());
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line_begin = it = it+1;
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continue;
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}
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Utf8It word_end = it+1;
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while (word_end != end and categorize(*word_end) == cat)
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++word_end;
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while (word_end > line_begin and word_end - line_begin >= max_width)
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{
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auto line_end = last_word_end <= line_begin ? line_begin + max_width
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: last_word_end;
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lines.emplace_back(line_begin.base(), line_end.base());
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while (line_end != end and is_horizontal_blank(*line_end))
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++line_end;
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if (line_end != end and *line_end == '\n')
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++line_end;
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it = line_begin = line_end;
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}
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if (cat == CharCategories::Word or cat == CharCategories::Punctuation)
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last_word_end = word_end;
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it = word_end;
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}
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if (line_begin != end)
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lines.emplace_back(line_begin.base(), text.end());
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return lines;
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}
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template<typename AppendFunc>
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void format_impl(StringView fmt, ArrayView<const StringView> params, AppendFunc append)
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{
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int implicitIndex = 0;
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for (auto it = fmt.begin(), end = fmt.end(); it != end;)
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{
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auto opening = std::find(it, end, '{');
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if (opening == end)
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{
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append(StringView{it, opening});
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break;
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}
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else if (opening != it and *(opening-1) == '\\')
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{
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append(StringView{it, opening-1});
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append('{');
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it = opening + 1;
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}
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else
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{
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append(StringView{it, opening});
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auto closing = std::find(opening, end, '}');
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if (closing == end)
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throw runtime_error("Format string error, unclosed '{'");
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int index;
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if (closing == opening + 1)
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index = implicitIndex;
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else
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index = str_to_int({opening+1, closing});
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if (index >= params.size())
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throw runtime_error("Format string parameter index too big");
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append(params[index]);
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implicitIndex = index+1;
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it = closing+1;
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}
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}
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}
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StringView format_to(ArrayView<char> buffer, StringView fmt, ArrayView<const StringView> params)
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{
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char* ptr = buffer.begin();
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const char* end = buffer.end();
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format_impl(fmt, params, [&](StringView s) mutable {
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for (auto c : s)
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{
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if (ptr == end)
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throw runtime_error("buffer is too small");
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*ptr++ = c;
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}
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});
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if (ptr == end)
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throw runtime_error("buffer is too small");
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*ptr = 0;
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return { buffer.begin(), ptr };
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}
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String format(StringView fmt, ArrayView<const StringView> params)
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{
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ByteCount size = fmt.length();
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for (auto& s : params) size += s.length();
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String res;
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res.reserve(size);
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format_impl(fmt, params, [&](StringView s) { res += s; });
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return res;
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}
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UnitTest test_string{[]()
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{
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kak_assert(String("youpi ") + "matin" == "youpi matin");
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Vector<String> splited = split("youpi:matin::tchou\\:kanaky:hihi\\:", ':', '\\');
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kak_assert(splited[0] == "youpi");
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kak_assert(splited[1] == "matin");
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kak_assert(splited[2] == "");
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kak_assert(splited[3] == "tchou:kanaky");
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kak_assert(splited[4] == "hihi:");
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Vector<StringView> splitedview = split("youpi:matin::tchou\\:kanaky:hihi\\:", ':');
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kak_assert(splitedview[0] == "youpi");
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kak_assert(splitedview[1] == "matin");
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kak_assert(splitedview[2] == "");
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kak_assert(splitedview[3] == "tchou\\");
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kak_assert(splitedview[4] == "kanaky");
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kak_assert(splitedview[5] == "hihi\\");
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kak_assert(splitedview[6] == "");
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Vector<StringView> wrapped = wrap_lines("wrap this paragraph\n respecting whitespaces and much_too_long_words", 16);
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kak_assert(wrapped.size() == 6);
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kak_assert(wrapped[0] == "wrap this");
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kak_assert(wrapped[1] == "paragraph");
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kak_assert(wrapped[2] == " respecting");
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kak_assert(wrapped[3] == "whitespaces and");
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kak_assert(wrapped[4] == "much_too_long_wo");
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kak_assert(wrapped[5] == "rds");
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Vector<StringView> wrapped2 = wrap_lines("error: unknown type", 7);
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kak_assert(wrapped2.size() == 3);
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kak_assert(wrapped2[0] == "error:");
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kak_assert(wrapped2[1] == "unknown");
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kak_assert(wrapped2[2] == "type");
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kak_assert(escape("youpi:matin:tchou:", ':', '\\') == "youpi\\:matin\\:tchou\\:");
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kak_assert(unescape("youpi\\:matin\\:tchou\\:", ':', '\\') == "youpi:matin:tchou:");
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kak_assert(prefix_match("tchou kanaky", "tchou"));
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kak_assert(prefix_match("tchou kanaky", "tchou kanaky"));
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kak_assert(prefix_match("tchou kanaky", "t"));
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kak_assert(not prefix_match("tchou kanaky", "c"));
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kak_assert(subsequence_match("tchou kanaky", "tknky"));
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kak_assert(subsequence_match("tchou kanaky", "knk"));
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kak_assert(subsequence_match("tchou kanaky", "tchou kanaky"));
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kak_assert(not subsequence_match("tchou kanaky", "tchou kanaky"));
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kak_assert(format("Youhou {1} {} {0} \\{}", 10, "hehe", 5) == "Youhou hehe 5 10 {}");
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char buffer[20];
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kak_assert(format_to(buffer, "Hey {}", 15) == "Hey 15");
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kak_assert(str_to_int("5") == 5);
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kak_assert(str_to_int(to_string(INT_MAX)) == INT_MAX);
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kak_assert(str_to_int(to_string(INT_MIN)) == INT_MIN);
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kak_assert(str_to_int("00") == 0);
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kak_assert(str_to_int("-0") == 0);
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kak_assert(replace("tchou/tcha/tchi", "/", "!!") == "tchou!!tcha!!tchi");
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}};
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}
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