[libsolidity] Refactor Compiler Stack imported source type.

Author: aarlt

libsolidity/interface/CompilerStack.cpp

@@ -410,7 +410,7 @@ void CompilerStack::importASTs(map<string, Json::Value> const& _sources)
 		m_sources[path] = std::move(source);
 	}
 	m_stackState = ParsedAndImported;
-	m_importedSources = true;
+	m_importedSourceType = ImportedSourceType::SolidityAST;
 
 	storeContractDefinitions();
 }
@@ -1482,7 +1482,19 @@ string CompilerStack::createMetadata(Contract const& _contract, bool _forIR) con
 {
 	Json::Value meta{Json::objectValue};
 	meta["version"] = 1;
-	meta["language"] = m_importedSources ? "SolidityAST" : "Solidity";
+	string sourceType;
+	switch (m_importedSourceType)
+	{
+	case ImportedSourceType::None:
+		sourceType = "Solidity";
+		break;
+	case ImportedSourceType::SolidityAST:
+		sourceType = "SolidityAST";
+		break;
+	default:
+		solAssert(false);
+	}
+	meta["language"] = sourceType;
 	meta["compiler"]["version"] = VersionStringStrict;
 
 	/// All the source files (including self), which should be included in the metadata.

libsolidity/interface/CompilerStack.h

@@ -117,6 +117,11 @@ class CompilerStack: public langutil::CharStreamProvider
 		None
 	};
 
+	enum class ImportedSourceType {
+		None,
+		SolidityAST
+	};
+
 	/// Creates a new compiler stack.
 	/// @param _readFile callback used to read files for import statements. Must return
 	/// and must not emit exceptions.
@@ -511,7 +516,7 @@ class CompilerStack: public langutil::CharStreamProvider
 	langutil::DebugInfoSelection m_debugInfoSelection = langutil::DebugInfoSelection::Default();
 	bool m_parserErrorRecovery = false;
 	State m_stackState = Empty;
-	bool m_importedSources = false;
+	ImportedSourceType m_importedSourceType = ImportedSourceType::None;
 	/// Whether or not there has been an error during processing.
 	/// If this is true, the stack will refuse to generate code.
 	bool m_hasError = false;