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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 <wtf/HashMap.h>
namespace WGSL {
namespace AST {
class Identifier;
}
template<typename ContextValue>
class ContextProvider {
class Context;
friend class ContextScope;
protected:
using ContextMap = HashMap<String, ContextValue>;
class ContextScope {
public:
ContextScope(ContextProvider*);
~ContextScope();
private:
ContextProvider& m_provider;
Context* m_previousContext;
};
ContextProvider();
const ContextValue* introduceVariable(const String&, const ContextValue&);
const ContextValue* readVariable(const String&) const;
private:
class Context {
public:
Context(const Context *const parent);
const ContextValue* lookup(const String&) const;
const ContextValue* add(const String&, const ContextValue&);
private:
const Context* m_parent { nullptr };
ContextMap m_map;
};
Context* m_context;
Vector<std::unique_ptr<Context>> m_contexts;
ContextScope m_globalScope;
};
} // namespace WGSL
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