solidity/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);
}

}
}