/*
	This file is part of solidity.

	solidity is free software: you can redistribute it and/or modify
	it under the terms of the GNU General Public License as published by
	the Free Software Foundation, either version 3 of the License, or
	(at your option) any later version.

	solidity is distributed in the hope that it will be useful,
	but WITHOUT ANY WARRANTY; without even the implied warranty of
	MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
	GNU General Public License for more details.

	You should have received a copy of the GNU General Public License
	along with solidity.  If not, see <http://www.gnu.org/licenses/>.
*/
/**
 * Module responsible for registering identifiers inside their scopes.
 */

#pragma once

#include <libsolidity/interface/Exceptions.h>

#include <boost/variant.hpp>

#include <functional>
#include <memory>

namespace dev
{
namespace solidity
{
namespace assembly
{

struct TypedName;
struct Literal;
struct Block;
struct Label;
struct FunctionalInstruction;
struct FunctionalAssignment;
struct VariableDeclaration;
struct Instruction;
struct Identifier;
struct StackAssignment;
struct FunctionDefinition;
struct FunctionCall;

struct Scope;

/**
 * Fills scopes with identifiers and checks for name clashes.
 * Does not resolve references.
 */
class ScopeFiller: public boost::static_visitor<bool>
{
public:
	using Scopes = std::map<assembly::Block const*, std::shared_ptr<Scope>>;
	ScopeFiller(Scopes& _scopes, ErrorList& _errors);

	bool operator()(assembly::Instruction const&) { return true; }
	bool operator()(assembly::Literal const&) { return true; }
	bool operator()(assembly::Identifier const&) { return true; }
	bool operator()(assembly::FunctionalInstruction const&) { return true; }
	bool operator()(assembly::Label const& _label);
	bool operator()(assembly::StackAssignment const&) { return true; }
	bool operator()(assembly::FunctionalAssignment const&) { return true; }
	bool operator()(assembly::VariableDeclaration const& _variableDeclaration);
	bool operator()(assembly::FunctionDefinition const& _functionDefinition);
	bool operator()(assembly::FunctionCall const&) { return true; }
	bool operator()(assembly::Block const& _block);

private:
	bool registerVariable(
		TypedName const& _name,
		SourceLocation const& _location,
		Scope& _scope
	);

	Scope& scope(assembly::Block const* _block);

	Scope* m_currentScope = nullptr;
	Scopes& m_scopes;
	ErrorList& m_errors;
};

}
}
}