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#pragma once
#include <AK/RefPtr.h>
#include <AK/RefCounted.h>
#include <AK/Types.h>
#include <AK/kmalloc.h>
namespace AK {
enum ShouldChomp {
NoChomp,
Chomp
};
class StringImpl : public RefCounted<StringImpl> {
public:
static NonnullRefPtr<StringImpl> create_uninitialized(int length, char*& buffer);
static RefPtr<StringImpl> create(const char* cstring, ShouldChomp = NoChomp);
static RefPtr<StringImpl> create(const char* cstring, int length, ShouldChomp = NoChomp);
NonnullRefPtr<StringImpl> to_lowercase() const;
NonnullRefPtr<StringImpl> to_uppercase() const;
void operator delete(void* ptr)
{
kfree(ptr);
}
static StringImpl& the_empty_stringimpl();
~StringImpl();
int length() const { return m_length; }
const char* characters() const { return &m_inline_buffer[0]; }
char operator[](int i) const
{
ASSERT(i >= 0 && i < m_length);
return characters()[i];
}
unsigned hash() const
{
if (!m_has_hash)
compute_hash();
return m_hash;
}
private:
enum ConstructTheEmptyStringImplTag {
ConstructTheEmptyStringImpl
};
explicit StringImpl(ConstructTheEmptyStringImplTag)
{
m_inline_buffer[0] = '\0';
}
enum ConstructWithInlineBufferTag {
ConstructWithInlineBuffer
};
StringImpl(ConstructWithInlineBufferTag, int length);
void compute_hash() const;
int m_length { 0 };
mutable unsigned m_hash { 0 };
mutable bool m_has_hash { false };
char m_inline_buffer[0];
};
inline constexpr u32 string_hash(const char* characters, int length)
{
u32 hash = 0;
for (int i = 0; i < length; ++i) {
hash += (u32)characters[i];
hash += (hash << 10);
hash ^= (hash >> 6);
}
hash += hash << 3;
hash ^= hash >> 11;
hash += hash << 15;
return hash;
}
}
using AK::Chomp;
using AK::string_hash;
using AK::StringImpl;
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