path: root/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);
}