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#pragma once
#include "asl/buffer.hpp"
#include "asl/string.hpp"
#include "asl/string_view.hpp"
namespace asl
{
template<allocator Allocator = DefaultAllocator>
class string_builder
{
buffer<char, Allocator> m_buffer;
public:
constexpr string_builder() requires default_constructible<Allocator> = default;
explicit constexpr string_builder(Allocator allocator) : m_buffer{ASL_MOVE(allocator)} {}
constexpr ~string_builder() = default;
constexpr string_builder(const string_builder&) requires copy_constructible<Allocator> = default;
constexpr string_builder(string_builder&&) = default;
constexpr string_builder& operator=(const string_builder&) requires copy_assignable<Allocator> = default;
constexpr string_builder& operator=(string_builder&&) = default;
constexpr string_view as_string_view() const
{
auto span = m_buffer.as_span();
return string_view{span.data(), span.size()};
}
void reset()
{
m_buffer.clear();
}
// @Todo(C++23) Deducing this
string_builder& push(string_view sv) &
{
isize_t old_size = m_buffer.size();
m_buffer.resize_zero(old_size + sv.size());
asl::memcpy(m_buffer.data() + old_size, sv.data(), sv.size());
return *this;
}
string_builder&& push(string_view sv) &&
{
isize_t old_size = m_buffer.size();
m_buffer.resize_zero(old_size + sv.size());
asl::memcpy(m_buffer.data() + old_size, sv.data(), sv.size());
return ASL_MOVE(*this);
}
string_builder& push(char c) &
{
m_buffer.push(c);
return *this;
}
string_builder&& push(char c) &&
{
m_buffer.push(c);
return ASL_MOVE(*this);
}
string<Allocator> finish() &&
{
return string<Allocator>{ASL_MOVE(m_buffer)};
}
template<allocator StringAllocator = Allocator>
string<StringAllocator> as_string()
requires default_constructible<StringAllocator>
{
return string<StringAllocator>{as_string_view()};
}
template<allocator StringAllocator = Allocator>
string<StringAllocator> as_string(Allocator allocator)
{
return string<StringAllocator>{as_string_view(), ASL_MOVE(allocator)};
}
};
string_builder() -> string_builder<>;
} // namespace asl
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