path: root/libsolidity/interface/SourceReferenceFormatter.cpp

/*
    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/>.
*/
/**
 * @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/interface/CompilerStack.h>
#include <libsolidity/parsing/Scanner.h>
#include <libsolidity/interface/Exceptions.h>

using namespace std;

namespace dev
{
namespace solidity
{

void SourceReferenceFormatter::printSourceLocation(
    ostream& _stream,
    SourceLocation const& _location,
    Scanner const& _scanner
)
{
    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);
        _stream << line << endl;
        for_each(
            line.cbegin(),
            line.cbegin() + startColumn,
            [&_stream](char const& ch) { _stream << (ch == '\t' ? '\t' : ' '); }
        );
        _stream << "^";
        if (endColumn > startColumn + 2)
            _stream << string(endColumn - startColumn - 2, '-');
        if (endColumn > startColumn + 1)
            _stream << "^";
        _stream << endl;
    }
    else
        _stream <<
            _scanner.lineAtPosition(_location.start) <<
            endl <<
            string(startColumn, ' ') <<
            "^\n" <<
            "Spanning multiple lines.\n";
}

void SourceReferenceFormatter::printSourceName(
    ostream& _stream,
    SourceLocation const& _location,
    Scanner const& _scanner
)
{
    int startLine;
    int startColumn;
    tie(startLine, startColumn) = _scanner.translatePositionToLineColumn(_location.start);
    _stream << *_location.sourceName << ":" << (startLine + 1) << ":" << (startColumn + 1) << ": ";
}

void SourceReferenceFormatter::printExceptionInformation(
    ostream& _stream,
    Exception const& _exception,
    string const& _name,
    CompilerStack const& _compiler
)
{
    SourceLocation const* location = boost::get_error_info<errinfo_sourceLocation>(_exception);
    auto secondarylocation = boost::get_error_info<errinfo_secondarySourceLocation>(_exception);
    Scanner const* scannerPtr = nullptr;

    if (location)
    {
        scannerPtr = &_compiler.scanner(*location->sourceName);
        printSourceName(_stream, *location, *scannerPtr);
    }

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

    if (location)
    {
        scannerPtr = &_compiler.scanner(*location->sourceName);
        printSourceLocation(_stream, *location, *scannerPtr);
    }

    if (secondarylocation && !secondarylocation->infos.empty())
    {
        for (auto info: secondarylocation->infos)
        {
            scannerPtr = &_compiler.scanner(*info.second.sourceName);
            _stream << info.first << " ";
            printSourceName(_stream, info.second, *scannerPtr);
            _stream << endl;
            printSourceLocation(_stream, info.second, *scannerPtr);
        }
        _stream << endl;
    }
}

}
}