2016-02-22 01:13:32 +00:00
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/*
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2019-02-13 15:56:46 +00:00
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This file is part of solidity.
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2016-02-22 01:13:32 +00:00
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2019-02-13 15:56:46 +00:00
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solidity is free software: you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation, either version 3 of the License, or
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(at your option) any later version.
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2016-02-22 01:13:32 +00:00
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2019-02-13 15:56:46 +00:00
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solidity is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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2016-02-22 01:13:32 +00:00
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2019-02-13 15:56:46 +00:00
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You should have received a copy of the GNU General Public License
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along with solidity. If not, see <http://www.gnu.org/licenses/>.
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2016-02-22 01:13:32 +00:00
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*/
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/**
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* @author Christian <c@ethdev.com>
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* @date 2016
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* Solidity parser shared functionality.
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*/
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2018-11-14 13:59:30 +00:00
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#include <liblangutil/ParserBase.h>
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#include <liblangutil/Scanner.h>
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#include <liblangutil/ErrorReporter.h>
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2016-02-22 01:13:32 +00:00
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using namespace std;
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2018-11-14 16:11:55 +00:00
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using namespace langutil;
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2016-02-22 01:13:32 +00:00
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int ParserBase::position() const
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{
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return m_scanner->currentLocation().start;
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}
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int ParserBase::endPosition() const
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{
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return m_scanner->currentLocation().end;
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}
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2018-10-22 14:48:21 +00:00
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Token ParserBase::currentToken() const
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2017-05-29 14:05:12 +00:00
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{
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return m_scanner->currentToken();
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}
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2018-10-22 14:48:21 +00:00
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Token ParserBase::peekNextToken() const
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2017-05-29 14:05:12 +00:00
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{
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return m_scanner->peekNextToken();
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}
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2019-05-27 14:13:27 +00:00
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string ParserBase::currentLiteral() const
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2017-05-29 14:05:12 +00:00
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{
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return m_scanner->currentLiteral();
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}
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2018-10-22 14:48:21 +00:00
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Token ParserBase::advance()
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2017-05-29 14:05:12 +00:00
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{
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return m_scanner->next();
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}
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2019-05-27 14:13:27 +00:00
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string ParserBase::tokenName(Token _token)
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{
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if (_token == Token::Identifier)
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return "identifier";
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else if (_token == Token::EOS)
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return "end of source";
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else if (TokenTraits::isReservedKeyword(_token))
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return "reserved keyword '" + TokenTraits::friendlyName(_token) + "'";
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else if (TokenTraits::isElementaryTypeName(_token)) //for the sake of accuracy in reporting
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{
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ElementaryTypeNameToken elemTypeName = m_scanner->currentElementaryTypeNameToken();
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return "'" + elemTypeName.toString() + "'";
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}
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else
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return "'" + TokenTraits::friendlyName(_token) + "'";
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}
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2018-10-22 14:48:21 +00:00
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void ParserBase::expectToken(Token _value, bool _advance)
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2016-02-22 01:13:32 +00:00
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{
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2018-10-22 14:48:21 +00:00
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Token tok = m_scanner->currentToken();
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2016-03-30 03:32:40 +00:00
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if (tok != _value)
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{
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2019-05-27 14:13:27 +00:00
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string const expectedToken = ParserBase::tokenName(_value);
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if (m_parserErrorRecovery)
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parserError("Expected " + expectedToken + " but got " + tokenName(tok));
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else
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fatalParserError("Expected " + expectedToken + " but got " + tokenName(tok));
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// Do not advance so that recovery can sync or make use of the current token.
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// This is especially useful if the expected token
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// is the only one that is missing and is at the end of a construct.
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// "{ ... ; }" is such an example.
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// ^
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_advance = false;
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}
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if (_advance)
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m_scanner->next();
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}
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void ParserBase::expectTokenOrConsumeUntil(Token _value, string const& _currentNodeName, bool _advance)
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{
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Token tok = m_scanner->currentToken();
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if (tok != _value)
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{
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int startPosition = position();
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SourceLocation errorLoc = SourceLocation{startPosition, endPosition(), source()};
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while (m_scanner->currentToken() != _value && m_scanner->currentToken() != Token::EOS)
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m_scanner->next();
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string const expectedToken = ParserBase::tokenName(_value);
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string const msg = "In " + _currentNodeName + ", " + expectedToken + "is expected; got " + ParserBase::tokenName(tok) + "instead.";
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if (m_scanner->currentToken() == Token::EOS)
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2016-03-30 03:32:40 +00:00
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{
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2019-05-27 14:13:27 +00:00
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// rollback to where the token started, and raise exception to be caught at a higher level.
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m_scanner->setPosition(startPosition);
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m_inParserRecovery = true;
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fatalParserError(errorLoc, msg);
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}
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else
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{
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if (m_inParserRecovery)
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parserWarning("Recovered in " + _currentNodeName + " at " + expectedToken + ".");
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2018-05-04 12:26:23 +00:00
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else
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2019-05-27 14:13:27 +00:00
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parserError(errorLoc, msg + "Recovered at next " + expectedToken);
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m_inParserRecovery = false;
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}
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}
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else if (m_inParserRecovery)
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{
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string expectedToken = ParserBase::tokenName(_value);
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parserWarning("Recovered in " + _currentNodeName + " at " + expectedToken + ".");
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m_inParserRecovery = false;
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2019-05-28 16:07:22 +00:00
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}
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2019-05-27 14:13:27 +00:00
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2018-05-02 19:42:26 +00:00
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if (_advance)
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m_scanner->next();
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2016-02-22 01:13:32 +00:00
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}
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2017-08-21 10:33:29 +00:00
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void ParserBase::increaseRecursionDepth()
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{
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m_recursionDepth++;
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2019-06-17 10:01:31 +00:00
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if (m_recursionDepth >= 1200)
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2017-08-21 10:33:29 +00:00
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fatalParserError("Maximum recursion depth reached during parsing.");
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}
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void ParserBase::decreaseRecursionDepth()
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{
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solAssert(m_recursionDepth > 0, "");
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m_recursionDepth--;
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}
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2019-05-27 14:13:27 +00:00
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void ParserBase::parserWarning(string const& _description)
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{
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m_errorReporter.warning(SourceLocation{position(), endPosition(), source()}, _description);
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}
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void ParserBase::parserError(SourceLocation const& _location, string const& _description)
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{
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m_errorReporter.parserError(_location, _description);
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}
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2016-02-22 01:13:32 +00:00
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void ParserBase::parserError(string const& _description)
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{
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2019-05-27 14:13:27 +00:00
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parserError(SourceLocation{position(), endPosition(), source()}, _description);
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2016-02-22 01:13:32 +00:00
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}
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void ParserBase::fatalParserError(string const& _description)
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{
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2019-05-27 14:13:27 +00:00
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fatalParserError(SourceLocation{position(), endPosition(), source()}, _description);
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}
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void ParserBase::fatalParserError(SourceLocation const& _location, string const& _description)
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{
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m_errorReporter.fatalParserError(_location, _description);
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2016-02-22 01:13:32 +00:00
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}
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