From 57c24511308f9cd1f981e92aacfb880825eb6ed9 Mon Sep 17 00:00:00 2001
From: Alex Beregszaszi <alex@rtfs.hu>
Date: Tue, 8 Aug 2017 14:09:57 +0100
Subject: Introduce ExperimentalFeatures header

---
 libsolidity/analysis/SyntaxChecker.cpp | 10 ++++------
 libsolidity/ast/ASTAnnotations.h       |  5 +++--
 libsolidity/ast/ExperimentalFeatures.h | 35 ++++++++++++++++++++++++++++++++++
 3 files changed, 42 insertions(+), 8 deletions(-)
 create mode 100644 libsolidity/ast/ExperimentalFeatures.h

diff --git a/libsolidity/analysis/SyntaxChecker.cpp b/libsolidity/analysis/SyntaxChecker.cpp
index 39f788c4..d2571cd3 100644
--- a/libsolidity/analysis/SyntaxChecker.cpp
+++ b/libsolidity/analysis/SyntaxChecker.cpp
@@ -18,6 +18,7 @@
 #include <libsolidity/analysis/SyntaxChecker.h>
 #include <memory>
 #include <libsolidity/ast/AST.h>
+#include <libsolidity/ast/ExperimentalFeatures.h>
 #include <libsolidity/analysis/SemVerHandler.h>
 #include <libsolidity/interface/ErrorReporter.h>
 #include <libsolidity/interface/Version.h>
@@ -69,9 +70,6 @@ bool SyntaxChecker::visit(PragmaDirective const& _pragma)
 		m_errorReporter.syntaxError(_pragma.location(), "Invalid pragma \"" + _pragma.literals()[0] + "\"");
 	else if (_pragma.literals()[0] == "experimental")
 	{
-		/// TODO: fill this out
-		static const set<string> validFeatures = set<string>{};
-
 		solAssert(m_sourceUnit, "");
 		vector<string> literals(_pragma.literals().begin() + 1, _pragma.literals().end());
 		if (literals.size() == 0)
@@ -89,13 +87,13 @@ bool SyntaxChecker::visit(PragmaDirective const& _pragma)
 			string const literal = literals[0];
 			if (literal.empty())
 				m_errorReporter.syntaxError(_pragma.location(), "Empty experimental feature name is invalid.");
-			else if (!validFeatures.count(literal))
+			else if (!ExperimentalFeatureNames.count(literal))
 				m_errorReporter.syntaxError(_pragma.location(), "Unsupported experimental feature name.");
-			else if (m_sourceUnit->annotation().experimentalFeatures.count(literal))
+			else if (m_sourceUnit->annotation().experimentalFeatures.count(ExperimentalFeatureNames.at(literal)))
 				m_errorReporter.syntaxError(_pragma.location(), "Duplicate experimental feature name.");
 			else
 			{
-				m_sourceUnit->annotation().experimentalFeatures.insert(literal);
+				m_sourceUnit->annotation().experimentalFeatures.insert(ExperimentalFeatureNames.at(literal));
 				m_errorReporter.warning(_pragma.location(), "Experimental features are turned on. Do not use experimental features on live deployments.");
 			}
 		}
diff --git a/libsolidity/ast/ASTAnnotations.h b/libsolidity/ast/ASTAnnotations.h
index 083ecfa4..fd9efb4d 100644
--- a/libsolidity/ast/ASTAnnotations.h
+++ b/libsolidity/ast/ASTAnnotations.h
@@ -23,6 +23,7 @@
 #pragma once
 
 #include <libsolidity/ast/ASTForward.h>
+#include <libsolidity/ast/ExperimentalFeatures.h>
 
 #include <map>
 #include <memory>
@@ -61,8 +62,8 @@ struct SourceUnitAnnotation: ASTAnnotation
 	std::string path;
 	/// The exported symbols (all global symbols).
 	std::map<ASTString, std::vector<Declaration const*>> exportedSymbols;
-	/// Experimental feature pragmas.
-	std::set<ASTString> experimentalFeatures;
+	/// Experimental features.
+	std::set<ExperimentalFeature> experimentalFeatures;
 };
 
 struct ImportAnnotation: ASTAnnotation
diff --git a/libsolidity/ast/ExperimentalFeatures.h b/libsolidity/ast/ExperimentalFeatures.h
new file mode 100644
index 00000000..b0a07142
--- /dev/null
+++ b/libsolidity/ast/ExperimentalFeatures.h
@@ -0,0 +1,35 @@
+/*
+	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/>.
+*/
+/**
+ * List of experimental features.
+ */
+
+#pragma once
+
+#include <map>
+
+namespace dev
+{
+namespace solidity
+{
+
+enum class ExperimentalFeature {};
+
+static const std::map<std::string, ExperimentalFeature> ExperimentalFeatureNames = {};
+
+}
+}
-- 
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