Adding const attribute to ABI output

libsolidity/InterfaceHandler.cpp

@@ -56,6 +56,7 @@ std::unique_ptr<std::string> InterfaceHandler::getABIInterface(ContractDefinitio
 		};
 
 		method["name"] = f->getName();
+		method["const"] = f->isDeclaredConst();
 		method["inputs"] = populateParameters(f->getParameters());
 		method["outputs"] = populateParameters(f->getReturnParameters());
 		methods.append(method);

test/SolidityABIJSON.cpp

@@ -76,6 +76,7 @@ BOOST_AUTO_TEST_CASE(basic_test)
 	char const* interface = R"([
 	{
 		"name": "f",
+		"const": false,
 		"inputs": [
 		{
 			"name": "a",
@@ -114,6 +115,7 @@ BOOST_AUTO_TEST_CASE(multiple_methods)
 	char const* interface = R"([
 	{
 		"name": "f",
+		"const": false,
 		"inputs": [
 		{
 			"name": "a",
@@ -129,6 +131,7 @@ BOOST_AUTO_TEST_CASE(multiple_methods)
 	},
 	{
 		"name": "g",
+		"const": false,
 		"inputs": [
 		{
 			"name": "b",
@@ -156,6 +159,7 @@ BOOST_AUTO_TEST_CASE(multiple_params)
 	char const* interface = R"([
 	{
 		"name": "f",
+		"const": false,
 		"inputs": [
 		{
 			"name": "a",
@@ -189,6 +193,7 @@ BOOST_AUTO_TEST_CASE(multiple_methods_order)
 	char const* interface = R"([
 	{
 		"name": "c",
+		"const": false,
 		"inputs": [
 		{
 			"name": "b",
@@ -204,6 +209,7 @@ BOOST_AUTO_TEST_CASE(multiple_methods_order)
 	},
 	{
 		"name": "f",
+		"const": false,
 		"inputs": [
 		{
 			"name": "a",
@@ -222,6 +228,53 @@ BOOST_AUTO_TEST_CASE(multiple_methods_order)
 	checkInterface(sourceCode, interface);
 }
 
+BOOST_AUTO_TEST_CASE(const_function)
+{
+	char const* sourceCode = "contract test {\n"
+	"  function foo(uint a, uint b) returns(uint d) { return a + b; }\n"
+	"  function boo(uint32 a) const returns(uint b) { return a * 4; }\n"
+	"}\n";
+
+	char const* interface = R"([
+	{
+		"name": "boo",
+		"const": true,
+		"inputs": [{
+			"name": "a",
+			"type": "uint32"
+		}],
+		"outputs": [
+		{
+			"name": "b",
+			"type": "uint256"
+		}
+		]
+	},
+	{
+		"name": "foo",
+		"const": false,
+		"inputs": [
+		{
+			"name": "a",
+			"type": "uint256"
+		},
+		{
+			"name": "b",
+			"type": "uint256"
+		}
+		],
+		"outputs": [
+		{
+			"name": "d",
+			"type": "uint256"
+		}
+		]
+	}
+	])";
+
+	checkInterface(sourceCode, interface);
+}
+
 BOOST_AUTO_TEST_SUITE_END()
 
 }