Isolating files shared between Yul- and Solidity language frontend.

1 files changed, 93 insertions, 0 deletions

diff --git a/liblangutil/ParserBase.h b/liblangutil/ParserBase.h
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+++ b/liblangutil/ParserBase.h
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+/*
+    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 Christian <c@ethdev.com>
+ * @date 2016
+ * Solidity parser shared functionality.
+ */
+
+#pragma once
+
+#include <memory>
+#include <liblangutil/Token.h>
+
+namespace dev
+{
+namespace solidity
+{
+
+class ErrorReporter;
+class Scanner;
+
+class ParserBase
+{
+public:
+	explicit ParserBase(ErrorReporter& errorReporter): m_errorReporter(errorReporter) {}
+
+	std::shared_ptr<std::string const> const& sourceName() const;
+
+protected:
+	/// Utility class that creates an error and throws an exception if the
+	/// recursion depth is too deep.
+	class RecursionGuard
+	{
+	public:
+		explicit RecursionGuard(ParserBase& _parser): m_parser(_parser)
+		{
+			m_parser.increaseRecursionDepth();
+		}
+		~RecursionGuard() { m_parser.decreaseRecursionDepth(); }
+	private:
+		ParserBase& m_parser;
+	};
+
+	/// 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, bool _advance = true);
+	Token currentToken() const;
+	Token peekNextToken() const;
+	std::string currentLiteral() const;
+	Token advance();
+	///@}
+
+	/// Increases the recursion depth and throws an exception if it is too deep.
+	void increaseRecursionDepth();
+	void decreaseRecursionDepth();
+
+	/// 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
+	ErrorReporter& m_errorReporter;
+	/// Current recursion depth during parsing.
+	size_t m_recursionDepth = 0;
+};
+
+}
+}