libsolidity/analysis/SyntaxChecker.cpp


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/*
    This file is part of cpp-ethereum.

    cpp-ethereum 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.

    cpp-ethereum 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 cpp-ethereum.  If not, see <http://www.gnu.org/licenses/>.
*/

#include <memory>
#include <libsolidity/ast/AST.h>
#include <libsolidity/analysis/SyntaxChecker.h>

using namespace std;
using namespace dev;
using namespace dev::solidity;


bool SyntaxChecker::checkSyntax(SourceUnit const& _sourceUnit)
{
    _sourceUnit.accept(*this);
    return m_errors.empty();
}

void SyntaxChecker::syntaxError(SourceLocation const& _location, std::string const& _description)
{
    auto err = make_shared<Error>(Error::Type::SyntaxError);
    *err <<
        errinfo_sourceLocation(_location) <<
        errinfo_comment(_description);

    m_errors.push_back(err);
}

bool SyntaxChecker::visit(WhileStatement const& _whileStatement)
{
    _whileStatement.body().annotation().isInLoop = true;
    return true;
}

bool SyntaxChecker::visit(ForStatement const& _forStatement)
{
    _forStatement.body().annotation().isInLoop = true;
    return true;
}

bool SyntaxChecker::visit(Block const& _blockStatement)
{
    bool inLoop = _blockStatement.annotation().isInLoop;
    for (auto& statement : _blockStatement.statements())
        statement->annotation().isInLoop = inLoop;
    return true;
}

bool SyntaxChecker::visit(IfStatement const& _ifStatement)
{
    bool inLoop = _ifStatement.annotation().isInLoop;
    _ifStatement.trueStatement().annotation().isInLoop = inLoop;
    if (_ifStatement.falseStatement())
        _ifStatement.falseStatement()->annotation().isInLoop = inLoop;
    return true;
}

bool SyntaxChecker::visit(Continue const& _continueStatement)
{
    if (!_continueStatement.annotation().isInLoop)
        // we're not in a for/while loop, report syntax error
        syntaxError(_continueStatement.location(), "\"continue\" has to be in a \"for\" or \"while\" loop.");
    return true;
}

bool SyntaxChecker::visit(Break const& _breakStatement)
{
    if (!_breakStatement.annotation().isInLoop)
        // we're not in a for/while loop, report syntax error
        syntaxError(_breakStatement.location(), "\"break\" has to be in a \"for\" or \"while\" loop.");
    return true;
}