path: root/libsolidity/interface/SourceReferenceFormatter.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 2014
 * Formatting functions for errors referencing positions and locations in the source.
 */

#include <libsolidity/interface/SourceReferenceFormatter.h>
#include <libsolidity/parsing/Scanner.h>
#include <libsolidity/interface/Exceptions.h>

using namespace std;

namespace dev
{
namespace solidity
{

void SourceReferenceFormatter::printSourceLocation(SourceLocation const* _location)
{
    if (!_location || !_location->sourceName)
        return; // Nothing we can print here
    auto const& scanner = m_scannerFromSourceName(*_location->sourceName);
    int startLine;
    int startColumn;
    tie(startLine, startColumn) = scanner.translatePositionToLineColumn(_location->start);
    int endLine;
    int endColumn;
    tie(endLine, endColumn) = scanner.translatePositionToLineColumn(_location->end);
    if (startLine == endLine)
    {
        string line = scanner.lineAtPosition(_location->start);

        int locationLength = endColumn - startColumn;
        if (locationLength > 150)
        {
            line = line.substr(0, startColumn + 35) + " ... " + line.substr(endColumn - 35);
            endColumn = startColumn + 75;
            locationLength = 75;
        }
        if (line.length() > 150)
        {
            line = " ... " + line.substr(startColumn, locationLength) + " ... ";
            startColumn = 5;
            endColumn = startColumn + locationLength;
        }

        m_stream << line << endl;

        for_each(
            line.cbegin(),
            line.cbegin() + startColumn,
            [this](char const& ch) { m_stream << (ch == '\t' ? '\t' : ' '); }
        );
        m_stream << "^";
        if (endColumn > startColumn + 2)
            m_stream << string(endColumn - startColumn - 2, '-');
        if (endColumn > startColumn + 1)
            m_stream << "^";
        m_stream << endl;
    }
    else
        m_stream <<
            scanner.lineAtPosition(_location->start) <<
            endl <<
            string(startColumn, ' ') <<
            "^ (Relevant source part starts here and spans across multiple lines)." <<
            endl;
}

void SourceReferenceFormatter::printSourceName(SourceLocation const* _location)
{
    if (!_location || !_location->sourceName)
        return; // Nothing we can print here
    auto const& scanner = m_scannerFromSourceName(*_location->sourceName);
    int startLine;
    int startColumn;
    tie(startLine, startColumn) = scanner.translatePositionToLineColumn(_location->start);
    m_stream << *_location->sourceName << ":" << (startLine + 1) << ":" << (startColumn + 1) << ": ";
}

void SourceReferenceFormatter::printExceptionInformation(
    Exception const& _exception,
    string const& _name
)
{
    SourceLocation const* location = boost::get_error_info<errinfo_sourceLocation>(_exception);
    auto secondarylocation = boost::get_error_info<errinfo_secondarySourceLocation>(_exception);

    printSourceName(location);

    m_stream << _name;
    if (string const* description = boost::get_error_info<errinfo_comment>(_exception))
        m_stream << ": " << *description << endl;
    else
        m_stream << endl;

    printSourceLocation(location);

    if (secondarylocation && !secondarylocation->infos.empty())
    {
        for (auto info: secondarylocation->infos)
        {
            printSourceName(&info.second);
            m_stream << info.first << endl;
            printSourceLocation(&info.second);
        }
        m_stream << endl;
    }
}

}
}