solidity/liblangutil/ParserBase.cpp

/*
	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/>.
*/
/**
 * @author Christian <c@ethdev.com>
 * @date 2016
 * Solidity parser shared functionality.
 */

#include <liblangutil/ParserBase.h>
#include <liblangutil/Scanner.h>
#include <liblangutil/ErrorReporter.h>

using namespace std;
using namespace langutil;

int ParserBase::position() const
{
	return m_scanner->currentLocation().start;
}

int ParserBase::endPosition() const
{
	return m_scanner->currentLocation().end;
}

Token ParserBase::currentToken() const
{
	return m_scanner->currentToken();
}

Token ParserBase::peekNextToken() const
{
	return m_scanner->peekNextToken();
}

std::string ParserBase::currentLiteral() const
{
	return m_scanner->currentLiteral();
}

Token ParserBase::advance()
{
	return m_scanner->next();
}

void ParserBase::expectToken(Token _value, bool _advance)
{
	Token tok = m_scanner->currentToken();
	if (tok != _value)
	{
		auto tokenName = [this](Token _token)
		{
			if (_token == Token::Identifier)
				return string("identifier");
			else if (_token == Token::EOS)
				return string("end of source");
			else if (TokenTraits::isReservedKeyword(_token))
				return string("reserved keyword '") + TokenTraits::friendlyName(_token) + "'";
			else if (TokenTraits::isElementaryTypeName(_token)) //for the sake of accuracy in reporting
			{
				ElementaryTypeNameToken elemTypeName = m_scanner->currentElementaryTypeNameToken();
				return string("'") + elemTypeName.toString() + "'";
			}
			else
				return string("'") + TokenTraits::friendlyName(_token) + "'";
		};

		fatalParserError(string("Expected ") + tokenName(_value) + string(" but got ") + tokenName(tok));
	}
	if (_advance)
		m_scanner->next();
}

void ParserBase::increaseRecursionDepth()
{
	m_recursionDepth++;
	if (m_recursionDepth >= 2560)
		fatalParserError("Maximum recursion depth reached during parsing.");
}

void ParserBase::decreaseRecursionDepth()
{
	solAssert(m_recursionDepth > 0, "");
	m_recursionDepth--;
}

void ParserBase::parserError(string const& _description)
{
	m_errorReporter.parserError(SourceLocation{position(), endPosition(), source()}, _description);
}

void ParserBase::fatalParserError(string const& _description)
{
	m_errorReporter.fatalParserError(SourceLocation{position(), endPosition(), source()}, _description);
}