#ifndef StringHash_h
#define StringHash_h
#include <wtf/text/AtomicString.h>
#include <wtf/HashTraits.h>
#include <wtf/StringHasher.h>
namespace WTF {
inline bool HashTraits<String>::isEmptyValue(const String& value)
{
return value.isNull();
}
struct StringHash {
static unsigned hash(StringImpl* key) { return key->hash(); }
static inline bool equal(const StringImpl* a, const StringImpl* b)
{
return WTF::equal(*a, *b);
}
static unsigned hash(const RefPtr<StringImpl>& key) { return key->hash(); }
static bool equal(const RefPtr<StringImpl>& a, const RefPtr<StringImpl>& b)
{
return equal(a.get(), b.get());
}
static bool equal(const RefPtr<StringImpl>& a, const StringImpl* b)
{
return equal(a.get(), b);
}
static bool equal(const StringImpl* a, const RefPtr<StringImpl>& b)
{
return equal(a, b.get());
}
static unsigned hash(const String& key) { return key.impl()->hash(); }
static bool equal(const String& a, const String& b)
{
return equal(a.impl(), b.impl());
}
static const bool safeToCompareToEmptyOrDeleted = false;
};
class CaseFoldingHash {
public:
template<typename T> static inline UChar foldCase(T character)
{
if (std::is_same<T, LChar>::value)
return StringImpl::latin1CaseFoldTable[character];
return u_foldCase(character, U_FOLD_CASE_DEFAULT);
}
static unsigned hash(const UChar* data, unsigned length)
{
return StringHasher::computeHashAndMaskTop8Bits<UChar, foldCase<UChar>>(data, length);
}
static unsigned hash(StringImpl& string)
{
if (string.is8Bit())
return hash(string.characters8(), string.length());
return hash(string.characters16(), string.length());
}
static unsigned hash(StringImpl* string)
{
ASSERT(string);
return hash(*string);
}
static unsigned hash(const LChar* data, unsigned length)
{
return StringHasher::computeHashAndMaskTop8Bits<LChar, foldCase<LChar>>(data, length);
}
static inline unsigned hash(const char* data, unsigned length)
{
return CaseFoldingHash::hash(reinterpret_cast<const LChar*>(data), length);
}
static inline bool equal(const StringImpl* a, const StringImpl* b)
{
return equalIgnoringCaseNonNull(a, b);
}
static unsigned hash(const RefPtr<StringImpl>& key)
{
return hash(*key);
}
static bool equal(const RefPtr<StringImpl>& a, const RefPtr<StringImpl>& b)
{
return equal(a.get(), b.get());
}
static unsigned hash(const String& key)
{
return hash(key.impl());
}
static unsigned hash(const AtomicString& key)
{
return hash(key.impl());
}
static bool equal(const String& a, const String& b)
{
return equal(a.impl(), b.impl());
}
static bool equal(const AtomicString& a, const AtomicString& b)
{
return a == b || equal(a.impl(), b.impl());
}
static const bool safeToCompareToEmptyOrDeleted = false;
};
struct AlreadyHashed : IntHash<unsigned> {
static unsigned hash(unsigned key) { return key; }
static unsigned avoidDeletedValue(unsigned hash)
{
ASSERT(hash);
unsigned newHash = hash | (!(hash + 1) << 31);
ASSERT(newHash);
ASSERT(newHash != 0xFFFFFFFF);
return newHash;
}
};
}
using WTF::AlreadyHashed;
using WTF::CaseFoldingHash;
using WTF::StringHash;
#endif