Move reusable parser components into base class.

1 files changed, 76 insertions, 0 deletions

diff --git a/libsolidity/parsing/ParserBase.h b/libsolidity/parsing/ParserBase.h
new file mode 100644
index 00000000..f087a6a9
--- /dev/null
+++ b/libsolidity/parsing/ParserBase.h
@@ -0,0 +1,76 @@
+/*
+    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 2016
+ * Solidity parser shared functionality.
+ */
+
+#pragma once
+
+#include <memory>
+#include <libsolidity/interface/Exceptions.h>
+#include <libsolidity/parsing/Token.h>
+
+namespace dev
+{
+namespace solidity
+{
+
+class Scanner;
+template <class T>
+using ASTPointer = std::shared_ptr<T>;
+using ASTString = std::string; // might be changed to a reference to the source
+
+class ParserBase
+{
+public:
+	ParserBase(ErrorList& errors): m_errors(errors) {}
+
+	std::shared_ptr<std::string const> const& sourceName() const;
+
+protected:
+	/// Start position of the current token
+	int position() const;
+	/// End position of the current token
+	int endPosition() const;
+
+
+	///@{
+	///@name Helper functions
+	/// If current token value is not _value, throw exception otherwise advance token.
+	void expectToken(Token::Value _value);
+	Token::Value expectAssignmentOperator();
+	ASTPointer<ASTString> expectIdentifierToken();
+	ASTPointer<ASTString> getLiteralAndAdvance();
+	///@}
+
+	/// Creates a @ref ParserError and annotates it with the current position and the
+	/// given @a _description.
+	void parserError(std::string const& _description);
+
+	/// Creates a @ref ParserError and annotates it with the current position and the
+	/// given @a _description. Throws the FatalError.
+	void fatalParserError(std::string const& _description);
+
+	std::shared_ptr<Scanner> m_scanner;
+	/// The reference to the list of errors and warning to add errors/warnings during parsing
+	ErrorList& m_errors;
+};
+
+}
+}