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/*
* Copyright (c) 2023 Apple Inc. All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
*
* THIS SOFTWARE IS PROVIDED BY APPLE INC. ``AS IS'' AND ANY
* EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
* PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL APPLE INC. OR
* CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
* EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
* PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
* PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY
* OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/
#pragma once
#include "ASTIdentifier.h"
#include "ContextProvider.h"
namespace WGSL {
template<typename Value>
ContextProvider<Value>::Context::Context(const Context *const parent)
: m_parent(parent)
{
}
template<typename Value>
const Value* ContextProvider<Value>::Context::lookup(const String& name) const
{
auto it = m_map.find(name);
if (it != m_map.end())
return &it->value;
if (m_parent)
return m_parent->lookup(name);
return nullptr;
}
template<typename Value>
const Value* ContextProvider<Value>::Context::add(const String& name, const Value& value)
{
auto result = m_map.add(name, value);
if (UNLIKELY(!result.isNewEntry))
return nullptr;
return &result.iterator->value;
}
template<typename Value>
ContextProvider<Value>::ContextScope::ContextScope(ContextProvider<Value>* provider)
: m_provider(*provider)
, m_previousContext(provider->m_context)
{
m_provider.m_contexts.append(Context { m_previousContext });
m_provider.m_context = &m_provider.m_contexts.last();
}
template<typename Value>
ContextProvider<Value>::ContextScope::~ContextScope()
{
m_provider.m_context = m_previousContext;
m_provider.m_contexts.removeLast();
}
template<typename Value>
ContextProvider<Value>::ContextProvider()
: m_context(nullptr)
, m_contexts()
, m_globalScope(this)
{
}
template<typename Value>
auto ContextProvider<Value>::introduceVariable(const String& name, const Value& value) -> const Value*
{
return m_context->add(name, value);
}
template<typename Value>
auto ContextProvider<Value>::readVariable(const String& name) const -> const Value*
{
return m_context->lookup(name);
}
} // namespace WGSL
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