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#include "slang-string-slice-pool.h"
namespace Slang {
/* static */ const StringSlicePool::Handle StringSlicePool::kNullHandle;
/* static */ const StringSlicePool::Handle StringSlicePool::kEmptyHandle;
/* static */const Index StringSlicePool::kDefaultHandlesCount;
StringSlicePool::StringSlicePool(Style style) :
m_style(style),
m_arena(1024)
{
clear();
}
StringSlicePool::StringSlicePool(const ThisType& rhs):
m_style(rhs.m_style),
m_arena(1024)
{
// Set with rhs
_set(rhs);
}
void StringSlicePool::operator=(const ThisType& rhs)
{
if (&rhs != this)
{
_set(rhs);
}
}
void StringSlicePool::_set(const ThisType& rhs)
{
SLANG_ASSERT(this != &rhs);
m_style = rhs.m_style;
clear();
const Index startIndex = rhs.getFirstAddedIndex();
const Count count = rhs.m_slices.getCount();
if (count == 0)
return;
// We need the same amount of slices
m_slices.setCount(count);
// Work out the total size to store all slices including terminating 0
// (which *isn't* part of the slice size)
size_t totalSize = 0;
for (Index i = startIndex; i < count; ++i)
{
const auto slice = rhs.m_slices[i];
totalSize += slice.getLength() + 1;
}
char* dst = (char*)m_arena.allocate(totalSize);
for (Index i = startIndex; i < count; ++i)
{
const auto srcSlice = rhs.m_slices[i];
const auto sliceSize = srcSlice.getLength();
// Copy over the src slices contents
::memcpy(dst, srcSlice.begin(), sliceSize);
// Zero terminate
dst[sliceSize] = 0;
const UnownedStringSlice dstSlice(dst, sliceSize);
// Set the slice
m_slices[i] = dstSlice;
// Add to the map
m_map.add(dstSlice, Handle(i));
// Skip to next slices storage
dst += sliceSize + 1;
}
}
bool StringSlicePool::operator==(const ThisType& rhs) const
{
if (this == &rhs)
{
return true;
}
if (m_style != rhs.m_style)
{
return false;
}
const auto count = m_slices.getCount();
if (count != rhs.m_slices.getCount())
{
return false;
}
for (Index i = 0; i < count; ++i)
{
if (m_slices[i] != rhs.m_slices[i])
{
return false;
}
}
return true;
}
void StringSlicePool::clear()
{
m_map.clear();
m_arena.deallocateAll();
switch (m_style)
{
case Style::Default:
{
// Add the defaults
m_slices.setCount(2);
m_slices[0] = UnownedStringSlice((const char*)nullptr, (const char*)nullptr);
m_slices[1] = UnownedStringSlice::fromLiteral("");
// Add the empty entry
m_map.add(m_slices[1], kEmptyHandle);
break;
}
case Style::Empty:
{
// There are no defaults
m_slices.clear();
break;
}
}
}
void StringSlicePool::swapWith(ThisType& rhs)
{
Swap(m_style, rhs.m_style);
m_slices.swapWith(rhs.m_slices);
m_map.swapWith(rhs.m_map);
m_arena.swapWith(rhs.m_arena);
}
StringSlicePool::Handle StringSlicePool::add(const Slice& slice)
{
const Handle* handlePtr = m_map.tryGetValue(slice);
if (handlePtr)
{
return *handlePtr;
}
// Create a scoped copy
UnownedStringSlice scopePath(m_arena.allocateString(slice.begin(), slice.getLength()), slice.getLength());
const auto index = m_slices.getCount();
m_slices.add(scopePath);
m_map.add(scopePath, Handle(index));
return Handle(index);
}
bool StringSlicePool::findOrAdd(const Slice& slice, Handle& outHandle)
{
const Handle* handlePtr = m_map.tryGetValue(slice);
if (handlePtr)
{
outHandle = *handlePtr;
return true;
}
// Need to add.
// Make a copy stored in the arena
UnownedStringSlice scopeSlice(m_arena.allocateString(slice.begin(), slice.getLength()), slice.getLength());
// Add using the arenas copy
Handle newHandle = Handle(m_slices.getCount());
m_map.add(scopeSlice, newHandle);
// Add to slices list
m_slices.add(scopeSlice);
outHandle = newHandle;
return false;
}
StringSlicePool::Handle StringSlicePool::add(StringRepresentation* stringRep)
{
if (stringRep == nullptr && m_style == Style::Default)
{
return kNullHandle;
}
return add(StringRepresentation::asSlice(stringRep));
}
StringSlicePool::Handle StringSlicePool::add(const char* chars)
{
switch (m_style)
{
case Style::Default:
{
if (!chars)
{
return kNullHandle;
}
if (chars[0] == 0)
{
return kEmptyHandle;
}
break;
}
case Style::Empty:
{
if (chars == nullptr)
{
SLANG_ASSERT(!"Empty style doesn't support nullptr");
// Return an invalid handle
return Handle(~HandleIntegral(0));
}
}
}
return add(UnownedStringSlice(chars));
}
Index StringSlicePool::findIndex(const Slice& slice) const
{
const Handle* handlePtr = m_map.tryGetValue(slice);
return handlePtr ? Index(*handlePtr) : -1;
}
ConstArrayView<UnownedStringSlice> StringSlicePool::getAdded() const
{
const Index firstIndex = getFirstAddedIndex();
return makeConstArrayView(m_slices.getBuffer() + firstIndex, m_slices.getCount() - firstIndex);
}
} // namespace Slang
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