path: root/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/SourceReferenceFormatter.h>
#include <libsolidity/CompilerStack.h>
#include <libsolidity/Scanner.h>
#include <libsolidity/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.getLineAtPosition(_location.start);
        _stream << line << endl;
        std::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.getLineAtPosition(_location.start) << endl
                << string(startColumn, ' ') << "^\n"
                << "Spanning multiple lines.\n";
}

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

    if (location)
    {
        scanner = &_compiler.getScanner(*location->sourceName);
        int startLine;
        int startColumn;
        tie(startLine, startColumn) = scanner->translatePositionToLineColumn(location->start);
        _stream << *location->sourceName << ":" << (startLine + 1) << ":" << (startColumn + 1) << ": ";
    }
    _stream << _name;
    if (string const* description = boost::get_error_info<errinfo_comment>(_exception))
        _stream << ": " << *description << endl;

    if (location)
        printSourceLocation(_stream, *location, *scanner);
}

}
}