Refactor error reporting

This commit introduces ErrorReporter, a utility class which consolidates
all of the error logging functionality into a common set of functions.
It also replaces all direct interactions with an ErrorList with calls to
an ErrorReporter.

This commit resolves issue #2209

libsolidity/interface/ErrorReporter.cpp

@@ -0,0 +1,186 @@
+/*
+	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 Rhett <roadriverrail@gmail.com>
+ * @date 2017
+ * Error helper class.
+ */
+
+#include <libsolidity/interface/ErrorReporter.h>
+#include <libsolidity/ast/AST.h>
+#include <memory>
+
+using namespace std;
+using namespace dev;
+using namespace dev::solidity;
+
+ErrorReporter& ErrorReporter::operator=(ErrorReporter const& _errorReporter)
+{
+	if (&_errorReporter == this)
+		return *this;
+	m_errorList = _errorReporter.m_errorList;
+	return *this;
+}
+
+
+void ErrorReporter::warning(string const& _description)
+{
+	error(Error::Type::Warning, SourceLocation(), _description);
+}
+
+void ErrorReporter::warning(SourceLocation const& _location, string const& _description)
+{
+	error(Error::Type::Warning, _location, _description);
+}
+
+void ErrorReporter::error(Error::Type _type, SourceLocation const& _location, string const& _description)
+{
+	auto err = make_shared<Error>(_type);
+	*err <<
+		errinfo_sourceLocation(_location) <<
+		errinfo_comment(_description);
+
+	m_errorList.push_back(err);
+}
+
+void ErrorReporter::error(Error::Type _type, SourceLocation const& _location, SecondarySourceLocation const& _secondaryLocation, string const& _description)
+{
+	auto err = make_shared<Error>(_type);
+	*err <<
+		errinfo_sourceLocation(_location) <<
+		errinfo_secondarySourceLocation(_secondaryLocation) <<
+		errinfo_comment(_description);
+
+	m_errorList.push_back(err);
+}
+
+
+void ErrorReporter::fatalError(Error::Type _type, SourceLocation const& _location, string const& _description)
+{
+	error(_type, _location, _description);
+	BOOST_THROW_EXCEPTION(FatalError());
+}
+
+ErrorList const& ErrorReporter::errors() const
+{
+	return m_errorList;
+}
+
+void ErrorReporter::clear()
+{
+	m_errorList.clear();
+}
+
+void ErrorReporter::declarationError(SourceLocation const& _location, SecondarySourceLocation const&_secondaryLocation, string const& _description)
+{
+	error(
+		Error::Type::DeclarationError,
+		_location,
+		_secondaryLocation,
+		_description
+	);
+}
+
+void ErrorReporter::declarationError(SourceLocation const& _location, string const& _description)
+{
+	error(
+		Error::Type::DeclarationError,
+		_location,
+		_description
+	);
+}
+
+void ErrorReporter::fatalDeclarationError(SourceLocation const& _location, std::string const& _description)
+{
+	fatalError(
+		Error::Type::DeclarationError,
+		_location,
+		_description);
+}
+
+void ErrorReporter::parserError(SourceLocation const& _location, string const& _description)
+{
+	error(
+		Error::Type::ParserError,
+		_location,
+		_description
+	);
+}
+
+void ErrorReporter::fatalParserError(SourceLocation const& _location, string const& _description)
+{
+	fatalError(
+		Error::Type::ParserError,
+		_location,
+		_description
+	);
+}
+
+void ErrorReporter::syntaxError(SourceLocation const& _location, string const& _description)
+{
+	error(
+		Error::Type::SyntaxError,
+		_location,
+		_description
+	);
+}
+
+void ErrorReporter::typeError(SourceLocation const& _location, string const& _description)
+{
+	error(
+		Error::Type::TypeError,
+		_location,
+		_description
+	);
+}
+
+
+void ErrorReporter::fatalTypeError(SourceLocation const& _location, string const& _description)
+{
+	fatalError(Error::Type::TypeError,
+		_location,
+		_description
+	);
+}
+
+void ErrorReporter::docstringParsingError(string const& _description)
+{
+	error(
+		Error::Type::DocstringParsingError,
+		SourceLocation(),
+		_description
+	);
+}
+
+void ErrorReporter::why3TranslatorError(ASTNode const& _location, std::string const& _description)
+{
+	error(
+		Error::Type::Why3TranslatorError,
+		_location.location(),
+		_description
+	);
+}
+
+void ErrorReporter::fatalWhy3TranslatorError(ASTNode const& _location, std::string const& _description)
+{
+	fatalError(
+		Error::Type::Why3TranslatorError,
+		_location.location(),
+		_description
+	);
+}
+