Do not include empty JSON objects in output.

5 files changed, 16 insertions, 10 deletions

diff --git a/libsolidity/interface/StandardCompiler.cpp b/libsolidity/interface/StandardCompiler.cpp
index 6415e732..137a4439 100644
--- a/libsolidity/interface/StandardCompiler.cpp
+++ b/libsolidity/interface/StandardCompiler.cpp
@@ -764,14 +764,18 @@ Json::Value StandardCompiler::compileInternal(Json::Value const& _input)
 				m_compilerStack.runtimeSourceMapping(contractName)
 			);
 
-		contractData["evm"] = evmData;
+		if (!evmData.empty())
+			contractData["evm"] = evmData;
 
-		if (!contractsOutput.isMember(file))
-			contractsOutput[file] = Json::objectValue;
-
-		contractsOutput[file][name] = contractData;
+		if (!contractData.empty())
+		{
+			if (!contractsOutput.isMember(file))
+				contractsOutput[file] = Json::objectValue;
+			contractsOutput[file][name] = contractData;
+		}
 	}
-	output["contracts"] = contractsOutput;
+	if (!contractsOutput.empty())
+		output["contracts"] = contractsOutput;
 
 	return output;
 }
diff --git a/test/cmdlineTests.sh b/test/cmdlineTests.sh
index bb71e012..9d2ffa5f 100755
--- a/test/cmdlineTests.sh
+++ b/test/cmdlineTests.sh
@@ -132,7 +132,7 @@ test_solc_behaviour() {
 
     if [[ "$solc_args" == *"--standard-json"* ]]; then
         sed -i -e 's/{[^{]*Warning: This is a pre-release compiler version[^}]*},\{0,1\}//' "$stdout_path"
-        sed -i -e 's/,"errors":\[\]//' "$stdout_path"
+        sed -i -e 's/"errors":\[\],\{0,1\}//' "$stdout_path"
     else
         sed -i -e '/^Warning: This is a pre-release compiler version, please do not use it in production./d' "$stderr_path"
         sed -i -e 's/ Consider adding "pragma .*$//' "$stderr_path"
diff --git a/test/cmdlineTests/standard.json.stdout b/test/cmdlineTests/standard.json.stdout
index 490e1f80..59b90c8c 100644
--- a/test/cmdlineTests/standard.json.stdout
+++ b/test/cmdlineTests/standard.json.stdout
@@ -1 +1 @@
-{"contracts":{"A":{"C":{"evm":{}}}},"sources":{"A":{"id":0}}}
+{"sources":{"A":{"id":0}}}
diff --git a/test/cmdlineTests/standard_only_ast_requested.json.stdout b/test/cmdlineTests/standard_only_ast_requested.json.stdout
index f4933c4b..b884ab7d 100644
--- a/test/cmdlineTests/standard_only_ast_requested.json.stdout
+++ b/test/cmdlineTests/standard_only_ast_requested.json.stdout
@@ -1 +1 @@
-{"contracts":{"A":{"C":{"evm":{}}}},"sources":{"A":{"ast":{"absolutePath":"A","exportedSymbols":{"C":[6]},"id":7,"nodeType":"SourceUnit","nodes":[{"id":1,"literals":["solidity",">=","0.0"],"nodeType":"PragmaDirective","src":"0:22:0"},{"baseContracts":[],"contractDependencies":[],"contractKind":"contract","documentation":null,"fullyImplemented":true,"id":6,"linearizedBaseContracts":[6],"name":"C","nodeType":"ContractDefinition","nodes":[{"body":{"id":4,"nodeType":"Block","src":"61:2:0","statements":[]},"documentation":null,"id":5,"implemented":true,"kind":"function","modifiers":[],"name":"f","nodeType":"FunctionDefinition","parameters":{"id":2,"nodeType":"ParameterList","parameters":[],"src":"46:2:0"},"returnParameters":{"id":3,"nodeType":"ParameterList","parameters":[],"src":"61:0:0"},"scope":6,"src":"36:27:0","stateMutability":"pure","superFunction":null,"visibility":"public"}],"scope":7,"src":"23:42:0"}],"src":"0:65:0"},"id":0}}}
+{"sources":{"A":{"ast":{"absolutePath":"A","exportedSymbols":{"C":[6]},"id":7,"nodeType":"SourceUnit","nodes":[{"id":1,"literals":["solidity",">=","0.0"],"nodeType":"PragmaDirective","src":"0:22:0"},{"baseContracts":[],"contractDependencies":[],"contractKind":"contract","documentation":null,"fullyImplemented":true,"id":6,"linearizedBaseContracts":[6],"name":"C","nodeType":"ContractDefinition","nodes":[{"body":{"id":4,"nodeType":"Block","src":"61:2:0","statements":[]},"documentation":null,"id":5,"implemented":true,"kind":"function","modifiers":[],"name":"f","nodeType":"FunctionDefinition","parameters":{"id":2,"nodeType":"ParameterList","parameters":[],"src":"46:2:0"},"returnParameters":{"id":3,"nodeType":"ParameterList","parameters":[],"src":"61:0:0"},"scope":6,"src":"36:27:0","stateMutability":"pure","superFunction":null,"visibility":"public"}],"scope":7,"src":"23:42:0"}],"src":"0:65:0"},"id":0}}}
diff --git a/test/libsolidity/LibSolc.cpp b/test/libsolidity/LibSolc.cpp
index 09c08700..ec97f22f 100644
--- a/test/libsolidity/LibSolc.cpp
+++ b/test/libsolidity/LibSolc.cpp
@@ -81,7 +81,9 @@ BOOST_AUTO_TEST_CASE(standard_compilation)
 
 	// Only tests some assumptions. The StandardCompiler is tested properly in another suite.
 	BOOST_CHECK(result.isMember("sources"));
-	BOOST_CHECK(result.isMember("contracts"));
+	// This used to test that it is a member, but we did not actually request any output,
+	// so there should not be a contract member.
+	BOOST_CHECK(!result.isMember("contracts"));
 }
 
 BOOST_AUTO_TEST_SUITE_END()