implement named arguments

libsolidity/AST.cpp

@@ -430,6 +430,8 @@ void FunctionCall::checkTypeRequirements()
 		// number of non-mapping members
 		if (m_arguments.size() != 1)
 			BOOST_THROW_EXCEPTION(createTypeError("More than one argument for explicit type conversion."));
+		if (!m_names.empty())
+			BOOST_THROW_EXCEPTION(createTypeError("Type conversion can't allow named arguments."));
 		if (!m_arguments.front()->getType()->isExplicitlyConvertibleTo(*type.getActualType()))
 			BOOST_THROW_EXCEPTION(createTypeError("Explicit type conversion not allowed."));
 		m_type = type.getActualType();
@@ -442,9 +444,44 @@ void FunctionCall::checkTypeRequirements()
 		TypePointers const& parameterTypes = functionType->getParameterTypes();
 		if (parameterTypes.size() != m_arguments.size())
 			BOOST_THROW_EXCEPTION(createTypeError("Wrong argument count for function call."));
+
+		if (m_names.empty())
+		{
 			for (size_t i = 0; i < m_arguments.size(); ++i)
 				if (!m_arguments[i]->getType()->isImplicitlyConvertibleTo(*parameterTypes[i]))
 					BOOST_THROW_EXCEPTION(createTypeError("Invalid type for argument in function call."));
+		}
+		else
+		{
+			auto const& parameterNames = functionType->getParameterNames();
+			if (parameterNames.size() != m_names.size())
+				BOOST_THROW_EXCEPTION(createTypeError("Some argument names are missing."));
+
+			// check duplicate names
+			for (size_t i = 0; i < m_names.size(); i++) {
+				for (size_t j = i + 1; j < m_names.size(); j++) {
+					if (m_names[i] == m_names[j])
+						BOOST_THROW_EXCEPTION(createTypeError("Duplicate named argument."));
+				}
+			}
+
+			for (size_t i = 0; i < m_names.size(); i++) {
+				bool found = false;
+				for (size_t j = 0; j < parameterNames.size(); j++) {
+					if (parameterNames[j] == m_names[i]) {
+						// check type convertible
+						if (!m_arguments[i]->getType()->isImplicitlyConvertibleTo(*parameterTypes[j]))
+							BOOST_THROW_EXCEPTION(createTypeError("Invalid type for argument in function call."));
+
+						found = true;
+						break;
+					}
+				}
+				if (!found)
+					BOOST_THROW_EXCEPTION(createTypeError("Named argument doesn't match function declaration."));
+			}
+		}
+
 		// @todo actually the return type should be an anonymous struct,
 		// but we change it to the type of the first return value until we have structs
 		if (functionType->getReturnParameterTypes().empty())

libsolidity/AST.h

@@ -983,14 +983,15 @@ class FunctionCall: public Expression
 {
 public:
 	FunctionCall(Location const& _location, ASTPointer<Expression> const& _expression,
-				 std::vector<ASTPointer<Expression>> const& _arguments):
-		Expression(_location), m_expression(_expression), m_arguments(_arguments) {}
+				 std::vector<ASTPointer<Expression>> const& _arguments, std::vector<std::string> const& _names):
+		Expression(_location), m_expression(_expression), m_arguments(_arguments), m_names(_names) {}
 	virtual void accept(ASTVisitor& _visitor) override;
 	virtual void accept(ASTConstVisitor& _visitor) const override;
 	virtual void checkTypeRequirements() override;
 
 	Expression const& getExpression() const { return *m_expression; }
 	std::vector<ASTPointer<Expression const>> getArguments() const { return {m_arguments.begin(), m_arguments.end()}; }
+	std::vector<std::string> const& getNames() const { return m_names; }
 
 	/// Returns true if this is not an actual function call, but an explicit type conversion
 	/// or constructor call.
@@ -999,6 +1000,7 @@ public:
 private:
 	ASTPointer<Expression> m_expression;
 	std::vector<ASTPointer<Expression>> m_arguments;
+	std::vector<std::string> m_names;
 };
 
 /**

libsolidity/ExpressionCompiler.cpp

@@ -193,6 +193,7 @@ bool ExpressionCompiler::visit(FunctionCall const& _functionCall)
 	{
 		//@todo struct construction
 		solAssert(_functionCall.getArguments().size() == 1, "");
+		solAssert(_functionCall.getNames().empty(), "");
 		Expression const& firstArgument = *_functionCall.getArguments().front();
 		firstArgument.accept(*this);
 		appendTypeConversion(*firstArgument.getType(), *_functionCall.getType());
@@ -200,8 +201,35 @@ bool ExpressionCompiler::visit(FunctionCall const& _functionCall)
 	else
 	{
 		FunctionType const& function = dynamic_cast<FunctionType const&>(*_functionCall.getExpression().getType());
-		vector<ASTPointer<Expression const>> arguments = _functionCall.getArguments();
-		solAssert(arguments.size() == function.getParameterTypes().size(), "");
+		TypePointers const& parameterTypes = function.getParameterTypes();
+		vector<string> const& parameterNames = function.getParameterNames();
+		vector<ASTPointer<Expression const>> const& callArguments = _functionCall.getArguments();
+		vector<string> const& callArgumentNames = _functionCall.getNames();
+		solAssert(callArguments.size() == parameterTypes.size(), "");
+
+		vector<ASTPointer<Expression const>> arguments;
+		if (callArgumentNames.empty())
+		{
+			// normal arguments
+			arguments = {callArguments.begin(), callArguments.end()};
+		}
+		else
+		{
+			// named arguments
+			for (size_t i = 0; i < parameterNames.size(); i++) {
+				bool found = false;
+				for (size_t j = 0; j < callArgumentNames.size(); j++) {
+					if (parameterNames[i] == callArgumentNames[j]) {
+						// we found the actual parameter position
+						arguments.push_back(callArguments[j]);
+
+						found = true;
+						break;
+					}
+				}
+				solAssert(found, "");
+			}
+		}
 
 		switch (function.getLocation())
 		{

libsolidity/Parser.cpp

@@ -172,7 +172,7 @@ ASTPointer<InheritanceSpecifier> Parser::parseInheritanceSpecifier()
 	if (m_scanner->getCurrentToken() == Token::LPAREN)
 	{
 		m_scanner->next();
-		arguments = parseFunctionCallArguments();
+		arguments = parseFunctionCallListArguments();
 		nodeFactory.markEndPosition();
 		expectToken(Token::RPAREN);
 	}
@@ -288,7 +288,7 @@ ASTPointer<ModifierInvocation> Parser::parseModifierInvocation()
 	if (m_scanner->getCurrentToken() == Token::LPAREN)
 	{
 		m_scanner->next();
-		arguments = parseFunctionCallArguments();
+		arguments = parseFunctionCallListArguments();
 		nodeFactory.markEndPosition();
 		expectToken(Token::RPAREN);
 	}
@@ -621,10 +621,12 @@ ASTPointer<Expression> Parser::parseLeftHandSideExpression()
 		case Token::LPAREN:
 		{
 			m_scanner->next();
-			vector<ASTPointer<Expression>> arguments = parseFunctionCallArguments();
+			vector<ASTPointer<Expression>> arguments;
+			vector<string> names;
+			parseFunctionCallArguments(arguments, names);
 			nodeFactory.markEndPosition();
 			expectToken(Token::RPAREN);
-			expression = nodeFactory.createNode<FunctionCall>(expression, arguments);
+			expression = nodeFactory.createNode<FunctionCall>(expression, arguments, names);
 		}
 		break;
 		default:
@@ -677,7 +679,7 @@ ASTPointer<Expression> Parser::parsePrimaryExpression()
 	return expression;
 }
 
-vector<ASTPointer<Expression>> Parser::parseFunctionCallArguments()
+vector<ASTPointer<Expression>> Parser::parseFunctionCallListArguments()
 {
 	vector<ASTPointer<Expression>> arguments;
 	if (m_scanner->getCurrentToken() != Token::RPAREN)
@@ -692,6 +694,39 @@ vector<ASTPointer<Expression>> Parser::parseFunctionCallArguments()
 	return arguments;
 }
 
+void Parser::parseFunctionCallArguments(vector<ASTPointer<Expression>>& _arguments, vector<string>& _names)
+{
+	Token::Value token = m_scanner->getCurrentToken();
+	if (token == Token::LBRACE)
+	{
+		// call({arg1 : 1, arg2 : 2 })
+		expectToken(Token::LBRACE);
+		while (m_scanner->getCurrentToken() != Token::RBRACE)
+		{
+			string identifier = *expectIdentifierToken();
+			expectToken(Token::COLON);
+			ASTPointer<Expression> expression = parseExpression();
+
+			_arguments.push_back(expression);
+			_names.push_back(identifier);
+
+			if (m_scanner->getCurrentToken() == Token::COMMA)
+			{
+				expectToken(Token::COMMA);
+			}
+			else
+			{
+				break;
+			}
+		}
+		expectToken(Token::RBRACE);
+	}
+	else
+	{
+		_arguments = parseFunctionCallListArguments();
+	}
+}
+
 
 bool Parser::peekVariableDefinition()
 {

libsolidity/Parser.h

@@ -72,7 +72,8 @@ private:
 	ASTPointer<Expression> parseUnaryExpression();
 	ASTPointer<Expression> parseLeftHandSideExpression();
 	ASTPointer<Expression> parsePrimaryExpression();
-	std::vector<ASTPointer<Expression>> parseFunctionCallArguments();
+	std::vector<ASTPointer<Expression>> parseFunctionCallListArguments();
+	void parseFunctionCallArguments(std::vector<ASTPointer<Expression>> & _arguments, std::vector<std::string> & _names);
 	///@}
 
 	///@{