From e3dffb611fe1736e3ffa170e6d8dc4dee17366bd Mon Sep 17 00:00:00 2001
From: chriseth <c@ethdev.com>
Date: Wed, 21 Oct 2015 00:21:52 +0200
Subject: File reorganisation.

---
 libsolidity/parsing/Parser.cpp | 1234 ++++++++++++++++++++++++++++++++++++++++
 1 file changed, 1234 insertions(+)
 create mode 100644 libsolidity/parsing/Parser.cpp

(limited to 'libsolidity/parsing/Parser.cpp')

diff --git a/libsolidity/parsing/Parser.cpp b/libsolidity/parsing/Parser.cpp
new file mode 100644
index 00000000..57f3e913
--- /dev/null
+++ b/libsolidity/parsing/Parser.cpp
@@ -0,0 +1,1234 @@
+/*
+    This file is part of cpp-ethereum.
+
+    cpp-ethereum 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.
+
+    cpp-ethereum 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 cpp-ethereum.  If not, see <http://www.gnu.org/licenses/>.
+*/
+/**
+ * @author Christian <c@ethdev.com>
+ * @date 2014
+ * Solidity parser.
+ */
+
+#include <vector>
+#include <libdevcore/Log.h>
+#include <libevmasm/SourceLocation.h>
+#include <libsolidity/parsing/Parser.h>
+#include <libsolidity/parsing/Scanner.h>
+#include <libsolidity/interface/Exceptions.h>
+#include <libsolidity/interface/InterfaceHandler.h>
+
+using namespace std;
+
+namespace dev
+{
+namespace solidity
+{
+
+/// AST node factory that also tracks the begin and end position of an AST node
+/// while it is being parsed
+class Parser::ASTNodeFactory
+{
+public:
+	ASTNodeFactory(Parser const& _parser):
+		m_parser(_parser), m_location(_parser.position(), -1, _parser.sourceName()) {}
+	ASTNodeFactory(Parser const& _parser, ASTPointer<ASTNode> const& _childNode):
+		m_parser(_parser), m_location(_childNode->location()) {}
+
+	void markEndPosition() { m_location.end = m_parser.endPosition(); }
+	void setLocation(SourceLocation const& _location) { m_location = _location; }
+	void setLocationEmpty() { m_location.end = m_location.start; }
+	/// Set the end position to the one of the given node.
+	void setEndPositionFromNode(ASTPointer<ASTNode> const& _node) { m_location.end = _node->location().end; }
+
+	template <class NodeType, typename... Args>
+	ASTPointer<NodeType> createNode(Args&& ... _args)
+	{
+		if (m_location.end < 0)
+			markEndPosition();
+		return make_shared<NodeType>(m_location, forward<Args>(_args)...);
+	}
+
+private:
+	Parser const& m_parser;
+	SourceLocation m_location;
+};
+
+ASTPointer<SourceUnit> Parser::parse(shared_ptr<Scanner> const& _scanner)
+{
+	try
+	{
+		m_scanner = _scanner;
+		ASTNodeFactory nodeFactory(*this);
+		vector<ASTPointer<ASTNode>> nodes;
+		while (m_scanner->currentToken() != Token::EOS)
+		{
+			switch (auto token = m_scanner->currentToken())
+			{
+			case Token::Import:
+				nodes.push_back(parseImportDirective());
+				break;
+			case Token::Contract:
+			case Token::Library:
+				nodes.push_back(parseContractDefinition(token == Token::Library));
+				break;
+			default:
+				fatalParserError(std::string("Expected import directive or contract definition."));
+			}
+		}
+		return nodeFactory.createNode<SourceUnit>(nodes);
+	}
+	catch (FatalError const& _error)
+	{
+		if (m_errors.empty())
+			throw; // Something is weird here, rather throw again.
+		return nullptr;
+	}
+}
+
+std::shared_ptr<const string> const& Parser::sourceName() const
+{
+	return m_scanner->sourceName();
+}
+
+int Parser::position() const
+{
+	return m_scanner->currentLocation().start;
+}
+
+int Parser::endPosition() const
+{
+	return m_scanner->currentLocation().end;
+}
+
+ASTPointer<ImportDirective> Parser::parseImportDirective()
+{
+	ASTNodeFactory nodeFactory(*this);
+	expectToken(Token::Import);
+	if (m_scanner->currentToken() != Token::StringLiteral)
+		fatalParserError(std::string("Expected string literal (URL)."));
+	ASTPointer<ASTString> url = getLiteralAndAdvance();
+	nodeFactory.markEndPosition();
+	expectToken(Token::Semicolon);
+	return nodeFactory.createNode<ImportDirective>(url);
+}
+
+ASTPointer<ContractDefinition> Parser::parseContractDefinition(bool _isLibrary)
+{
+	ASTNodeFactory nodeFactory(*this);
+	ASTPointer<ASTString> docString;
+	if (m_scanner->currentCommentLiteral() != "")
+		docString = make_shared<ASTString>(m_scanner->currentCommentLiteral());
+	expectToken(_isLibrary ? Token::Library : Token::Contract);
+	ASTPointer<ASTString> name = expectIdentifierToken();
+	vector<ASTPointer<InheritanceSpecifier>> baseContracts;
+	vector<ASTPointer<StructDefinition>> structs;
+	vector<ASTPointer<EnumDefinition>> enums;
+	vector<ASTPointer<VariableDeclaration>> stateVariables;
+	vector<ASTPointer<FunctionDefinition>> functions;
+	vector<ASTPointer<ModifierDefinition>> modifiers;
+	vector<ASTPointer<EventDefinition>> events;
+	if (m_scanner->currentToken() == Token::Is)
+		do
+		{
+			m_scanner->next();
+			baseContracts.push_back(parseInheritanceSpecifier());
+		}
+		while (m_scanner->currentToken() == Token::Comma);
+	expectToken(Token::LBrace);
+	while (true)
+	{
+		Token::Value currentTokenValue= m_scanner->currentToken();
+		if (currentTokenValue == Token::RBrace)
+			break;
+		else if (currentTokenValue == Token::Function)
+			functions.push_back(parseFunctionDefinition(name.get()));
+		else if (currentTokenValue == Token::Struct)
+			structs.push_back(parseStructDefinition());
+		else if (currentTokenValue == Token::Enum)
+			enums.push_back(parseEnumDefinition());
+		else if (
+			currentTokenValue == Token::Identifier ||
+			currentTokenValue == Token::Mapping ||
+			Token::isElementaryTypeName(currentTokenValue)
+		)
+		{
+			VarDeclParserOptions options;
+			options.isStateVariable = true;
+			options.allowInitialValue = true;
+			stateVariables.push_back(parseVariableDeclaration(options));
+			expectToken(Token::Semicolon);
+		}
+		else if (currentTokenValue == Token::Modifier)
+			modifiers.push_back(parseModifierDefinition());
+		else if (currentTokenValue == Token::Event)
+			events.push_back(parseEventDefinition());
+		else
+			fatalParserError(std::string("Function, variable, struct or modifier declaration expected."));
+	}
+	nodeFactory.markEndPosition();
+	expectToken(Token::RBrace);
+	return nodeFactory.createNode<ContractDefinition>(
+		name,
+		docString,
+		baseContracts,
+		structs,
+		enums,
+		stateVariables,
+		functions,
+		modifiers,
+		events,
+		_isLibrary
+	);
+}
+
+ASTPointer<InheritanceSpecifier> Parser::parseInheritanceSpecifier()
+{
+	ASTNodeFactory nodeFactory(*this);
+	ASTPointer<Identifier> name(parseIdentifier());
+	vector<ASTPointer<Expression>> arguments;
+	if (m_scanner->currentToken() == Token::LParen)
+	{
+		m_scanner->next();
+		arguments = parseFunctionCallListArguments();
+		nodeFactory.markEndPosition();
+		expectToken(Token::RParen);
+	}
+	else
+		nodeFactory.setEndPositionFromNode(name);
+	return nodeFactory.createNode<InheritanceSpecifier>(name, arguments);
+}
+
+Declaration::Visibility Parser::parseVisibilitySpecifier(Token::Value _token)
+{
+	Declaration::Visibility visibility(Declaration::Visibility::Default);
+	if (_token == Token::Public)
+		visibility = Declaration::Visibility::Public;
+	else if (_token == Token::Internal)
+		visibility = Declaration::Visibility::Internal;
+	else if (_token == Token::Private)
+		visibility = Declaration::Visibility::Private;
+	else if (_token == Token::External)
+		visibility = Declaration::Visibility::External;
+	else
+		solAssert(false, "Invalid visibility specifier.");
+	m_scanner->next();
+	return visibility;
+}
+
+ASTPointer<FunctionDefinition> Parser::parseFunctionDefinition(ASTString const* _contractName)
+{
+	ASTNodeFactory nodeFactory(*this);
+	ASTPointer<ASTString> docstring;
+	if (m_scanner->currentCommentLiteral() != "")
+		docstring = make_shared<ASTString>(m_scanner->currentCommentLiteral());
+
+	expectToken(Token::Function);
+	ASTPointer<ASTString> name;
+	if (m_scanner->currentToken() == Token::LParen)
+		name = make_shared<ASTString>(); // anonymous function
+	else
+		name = expectIdentifierToken();
+	VarDeclParserOptions options;
+	options.allowLocationSpecifier = true;
+	ASTPointer<ParameterList> parameters(parseParameterList(options));
+	bool isDeclaredConst = false;
+	Declaration::Visibility visibility(Declaration::Visibility::Default);
+	vector<ASTPointer<ModifierInvocation>> modifiers;
+	while (true)
+	{
+		Token::Value token = m_scanner->currentToken();
+		if (token == Token::Const)
+		{
+			isDeclaredConst = true;
+			m_scanner->next();
+		}
+		else if (token == Token::Identifier)
+			modifiers.push_back(parseModifierInvocation());
+		else if (Token::isVisibilitySpecifier(token))
+		{
+			if (visibility != Declaration::Visibility::Default)
+				fatalParserError(std::string("Multiple visibility specifiers."));
+			visibility = parseVisibilitySpecifier(token);
+		}
+		else
+			break;
+	}
+	ASTPointer<ParameterList> returnParameters;
+	if (m_scanner->currentToken() == Token::Returns)
+	{
+		bool const permitEmptyParameterList = false;
+		m_scanner->next();
+		returnParameters = parseParameterList(options, permitEmptyParameterList);
+	}
+	else
+		returnParameters = createEmptyParameterList();
+	ASTPointer<Block> block = ASTPointer<Block>();
+	nodeFactory.markEndPosition();
+	if (m_scanner->currentToken() != Token::Semicolon)
+	{
+		block = parseBlock();
+		nodeFactory.setEndPositionFromNode(block);
+	}
+	else
+		m_scanner->next(); // just consume the ';'
+	bool const c_isConstructor = (_contractName && *name == *_contractName);
+	return nodeFactory.createNode<FunctionDefinition>(
+		name,
+		visibility,
+		c_isConstructor,
+		docstring,
+		parameters,
+		isDeclaredConst,
+		modifiers,
+		returnParameters,
+		block
+	);
+}
+
+ASTPointer<StructDefinition> Parser::parseStructDefinition()
+{
+	ASTNodeFactory nodeFactory(*this);
+	expectToken(Token::Struct);
+	ASTPointer<ASTString> name = expectIdentifierToken();
+	vector<ASTPointer<VariableDeclaration>> members;
+	expectToken(Token::LBrace);
+	while (m_scanner->currentToken() != Token::RBrace)
+	{
+		members.push_back(parseVariableDeclaration());
+		expectToken(Token::Semicolon);
+	}
+	nodeFactory.markEndPosition();
+	expectToken(Token::RBrace);
+	return nodeFactory.createNode<StructDefinition>(name, members);
+}
+
+ASTPointer<EnumValue> Parser::parseEnumValue()
+{
+	ASTNodeFactory nodeFactory(*this);
+	nodeFactory.markEndPosition();
+	return nodeFactory.createNode<EnumValue>(expectIdentifierToken());
+}
+
+ASTPointer<EnumDefinition> Parser::parseEnumDefinition()
+{
+	ASTNodeFactory nodeFactory(*this);
+	expectToken(Token::Enum);
+	ASTPointer<ASTString> name = expectIdentifierToken();
+	vector<ASTPointer<EnumValue>> members;
+	expectToken(Token::LBrace);
+
+	while (m_scanner->currentToken() != Token::RBrace)
+	{
+		members.push_back(parseEnumValue());
+		if (m_scanner->currentToken() == Token::RBrace)
+			break;
+		expectToken(Token::Comma);
+		if (m_scanner->currentToken() != Token::Identifier)
+			fatalParserError(std::string("Expected Identifier after ','"));
+	}
+
+	nodeFactory.markEndPosition();
+	expectToken(Token::RBrace);
+	return nodeFactory.createNode<EnumDefinition>(name, members);
+}
+
+ASTPointer<VariableDeclaration> Parser::parseVariableDeclaration(
+	VarDeclParserOptions const& _options,
+	ASTPointer<TypeName> const& _lookAheadArrayType
+)
+{
+	ASTNodeFactory nodeFactory = _lookAheadArrayType ?
+		ASTNodeFactory(*this, _lookAheadArrayType) : ASTNodeFactory(*this);
+	ASTPointer<TypeName> type;
+	if (_lookAheadArrayType)
+		type = _lookAheadArrayType;
+	else
+	{
+		type = parseTypeName(_options.allowVar);
+		if (type != nullptr)
+			nodeFactory.setEndPositionFromNode(type);
+	}
+	bool isIndexed = false;
+	bool isDeclaredConst = false;
+	Declaration::Visibility visibility(Declaration::Visibility::Default);
+	VariableDeclaration::Location location = VariableDeclaration::Location::Default;
+	ASTPointer<ASTString> identifier;
+
+	while (true)
+	{
+		Token::Value token = m_scanner->currentToken();
+		if (_options.isStateVariable && Token::isVariableVisibilitySpecifier(token))
+		{
+			if (visibility != Declaration::Visibility::Default)
+				fatalParserError(std::string("Visibility already specified."));
+			visibility = parseVisibilitySpecifier(token);
+		}
+		else
+		{
+			if (_options.allowIndexed && token == Token::Indexed)
+				isIndexed = true;
+			else if (token == Token::Const)
+				isDeclaredConst = true;
+			else if (_options.allowLocationSpecifier && Token::isLocationSpecifier(token))
+			{
+				if (location != VariableDeclaration::Location::Default)
+					fatalParserError(std::string("Location already specified."));
+				if (!type)
+					fatalParserError(std::string("Location specifier needs explicit type name."));
+				location = (
+					token == Token::Memory ?
+					VariableDeclaration::Location::Memory :
+					VariableDeclaration::Location::Storage
+				);
+			}
+			else
+				break;
+			m_scanner->next();
+		}
+	}
+	nodeFactory.markEndPosition();
+
+	if (_options.allowEmptyName && m_scanner->currentToken() != Token::Identifier)
+	{
+		identifier = make_shared<ASTString>("");
+		solAssert(type != nullptr, "");
+		nodeFactory.setEndPositionFromNode(type);
+	}
+	else
+		identifier = expectIdentifierToken();
+	ASTPointer<Expression> value;
+	if (_options.allowInitialValue)
+	{
+		if (m_scanner->currentToken() == Token::Assign)
+		{
+			m_scanner->next();
+			value = parseExpression();
+			nodeFactory.setEndPositionFromNode(value);
+		}
+	}
+	return nodeFactory.createNode<VariableDeclaration>(
+		type,
+		identifier,
+		value,
+		visibility,
+		_options.isStateVariable,
+		isIndexed,
+		isDeclaredConst,
+		location
+	);
+}
+
+ASTPointer<ModifierDefinition> Parser::parseModifierDefinition()
+{
+	ScopeGuard resetModifierFlag([this]() { m_insideModifier = false; });
+	m_insideModifier = true;
+
+	ASTNodeFactory nodeFactory(*this);
+	ASTPointer<ASTString> docstring;
+	if (m_scanner->currentCommentLiteral() != "")
+		docstring = make_shared<ASTString>(m_scanner->currentCommentLiteral());
+
+	expectToken(Token::Modifier);
+	ASTPointer<ASTString> name(expectIdentifierToken());
+	ASTPointer<ParameterList> parameters;
+	if (m_scanner->currentToken() == Token::LParen)
+	{
+		VarDeclParserOptions options;
+		options.allowIndexed = true;
+		options.allowLocationSpecifier = true;
+		parameters = parseParameterList(options);
+	}
+	else
+		parameters = createEmptyParameterList();
+	ASTPointer<Block> block = parseBlock();
+	nodeFactory.setEndPositionFromNode(block);
+	return nodeFactory.createNode<ModifierDefinition>(name, docstring, parameters, block);
+}
+
+ASTPointer<EventDefinition> Parser::parseEventDefinition()
+{
+	ASTNodeFactory nodeFactory(*this);
+	ASTPointer<ASTString> docstring;
+	if (m_scanner->currentCommentLiteral() != "")
+		docstring = make_shared<ASTString>(m_scanner->currentCommentLiteral());
+
+	expectToken(Token::Event);
+	ASTPointer<ASTString> name(expectIdentifierToken());
+	ASTPointer<ParameterList> parameters;
+	if (m_scanner->currentToken() == Token::LParen)
+	{
+		VarDeclParserOptions options;
+		options.allowIndexed = true;
+		parameters = parseParameterList(options);
+	}
+	else
+		parameters = createEmptyParameterList();
+	bool anonymous = false;
+	if (m_scanner->currentToken() == Token::Anonymous)
+	{
+		anonymous = true;
+		m_scanner->next();
+	}
+	nodeFactory.markEndPosition();
+	expectToken(Token::Semicolon);
+	return nodeFactory.createNode<EventDefinition>(name, docstring, parameters, anonymous);
+}
+
+ASTPointer<ModifierInvocation> Parser::parseModifierInvocation()
+{
+	ASTNodeFactory nodeFactory(*this);
+	ASTPointer<Identifier> name(parseIdentifier());
+	vector<ASTPointer<Expression>> arguments;
+	if (m_scanner->currentToken() == Token::LParen)
+	{
+		m_scanner->next();
+		arguments = parseFunctionCallListArguments();
+		nodeFactory.markEndPosition();
+		expectToken(Token::RParen);
+	}
+	else
+		nodeFactory.setEndPositionFromNode(name);
+	return nodeFactory.createNode<ModifierInvocation>(name, arguments);
+}
+
+ASTPointer<Identifier> Parser::parseIdentifier()
+{
+	ASTNodeFactory nodeFactory(*this);
+	nodeFactory.markEndPosition();
+	return nodeFactory.createNode<Identifier>(expectIdentifierToken());
+}
+
+ASTPointer<TypeName> Parser::parseTypeName(bool _allowVar)
+{
+	ASTNodeFactory nodeFactory(*this);
+	ASTPointer<TypeName> type;
+	Token::Value token = m_scanner->currentToken();
+	if (Token::isElementaryTypeName(token))
+	{
+		type = ASTNodeFactory(*this).createNode<ElementaryTypeName>(token);
+		m_scanner->next();
+	}
+	else if (token == Token::Var)
+	{
+		if (!_allowVar)
+			fatalParserError(std::string("Expected explicit type name."));
+		m_scanner->next();
+	}
+	else if (token == Token::Mapping)
+		type = parseMapping();
+	else if (token == Token::Identifier)
+	{
+		ASTNodeFactory nodeFactory(*this);
+		nodeFactory.markEndPosition();
+		vector<ASTString> identifierPath{*expectIdentifierToken()};
+		while (m_scanner->currentToken() == Token::Period)
+		{
+			m_scanner->next();
+			nodeFactory.markEndPosition();
+			identifierPath.push_back(*expectIdentifierToken());
+		}
+		type = nodeFactory.createNode<UserDefinedTypeName>(identifierPath);
+	}
+	else
+		fatalParserError(std::string("Expected type name"));
+
+	if (type)
+		// Parse "[...]" postfixes for arrays.
+		while (m_scanner->currentToken() == Token::LBrack)
+		{
+			m_scanner->next();
+			ASTPointer<Expression> length;
+			if (m_scanner->currentToken() != Token::RBrack)
+				length = parseExpression();
+			nodeFactory.markEndPosition();
+			expectToken(Token::RBrack);
+			type = nodeFactory.createNode<ArrayTypeName>(type, length);
+		}
+	return type;
+}
+
+ASTPointer<Mapping> Parser::parseMapping()
+{
+	ASTNodeFactory nodeFactory(*this);
+	expectToken(Token::Mapping);
+	expectToken(Token::LParen);
+	if (!Token::isElementaryTypeName(m_scanner->currentToken()))
+		fatalParserError(std::string("Expected elementary type name for mapping key type"));
+	ASTPointer<ElementaryTypeName> keyType;
+	keyType = ASTNodeFactory(*this).createNode<ElementaryTypeName>(m_scanner->currentToken());
+	m_scanner->next();
+	expectToken(Token::Arrow);
+	bool const allowVar = false;
+	ASTPointer<TypeName> valueType = parseTypeName(allowVar);
+	nodeFactory.markEndPosition();
+	expectToken(Token::RParen);
+	return nodeFactory.createNode<Mapping>(keyType, valueType);
+}
+
+ASTPointer<ParameterList> Parser::parseParameterList(
+	VarDeclParserOptions const& _options,
+	bool _allowEmpty
+)
+{
+	ASTNodeFactory nodeFactory(*this);
+	vector<ASTPointer<VariableDeclaration>> parameters;
+	VarDeclParserOptions options(_options);
+	options.allowEmptyName = true;
+	expectToken(Token::LParen);
+	if (!_allowEmpty || m_scanner->currentToken() != Token::RParen)
+	{
+		parameters.push_back(parseVariableDeclaration(options));
+		while (m_scanner->currentToken() != Token::RParen)
+		{
+			expectToken(Token::Comma);
+			parameters.push_back(parseVariableDeclaration(options));
+		}
+	}
+	nodeFactory.markEndPosition();
+	m_scanner->next();
+	return nodeFactory.createNode<ParameterList>(parameters);
+}
+
+ASTPointer<Block> Parser::parseBlock()
+{
+	ASTNodeFactory nodeFactory(*this);
+	expectToken(Token::LBrace);
+	vector<ASTPointer<Statement>> statements;
+	while (m_scanner->currentToken() != Token::RBrace)
+		statements.push_back(parseStatement());
+	nodeFactory.markEndPosition();
+	expectToken(Token::RBrace);
+	return nodeFactory.createNode<Block>(statements);
+}
+
+ASTPointer<Statement> Parser::parseStatement()
+{
+	ASTPointer<Statement> statement;
+	switch (m_scanner->currentToken())
+	{
+	case Token::If:
+		return parseIfStatement();
+	case Token::While:
+		return parseWhileStatement();
+	case Token::For:
+		return parseForStatement();
+	case Token::LBrace:
+		return parseBlock();
+		// starting from here, all statements must be terminated by a semicolon
+	case Token::Continue:
+		statement = ASTNodeFactory(*this).createNode<Continue>();
+		m_scanner->next();
+		break;
+	case Token::Break:
+		statement = ASTNodeFactory(*this).createNode<Break>();
+		m_scanner->next();
+		break;
+	case Token::Return:
+	{
+		ASTNodeFactory nodeFactory(*this);
+		ASTPointer<Expression> expression;
+		if (m_scanner->next() != Token::Semicolon)
+		{
+			expression = parseExpression();
+			nodeFactory.setEndPositionFromNode(expression);
+		}
+		statement = nodeFactory.createNode<Return>(expression);
+		break;
+	}
+	case Token::Throw:
+	{
+		statement = ASTNodeFactory(*this).createNode<Throw>();
+		m_scanner->next();
+		break;
+	}
+	case Token::Identifier:
+		if (m_insideModifier && m_scanner->currentLiteral() == "_")
+		{
+			statement = ASTNodeFactory(*this).createNode<PlaceholderStatement>();
+			m_scanner->next();
+			return statement;
+		}
+	// fall-through
+	default:
+		statement = parseSimpleStatement();
+	}
+	expectToken(Token::Semicolon);
+	return statement;
+}
+
+ASTPointer<IfStatement> Parser::parseIfStatement()
+{
+	ASTNodeFactory nodeFactory(*this);
+	expectToken(Token::If);
+	expectToken(Token::LParen);
+	ASTPointer<Expression> condition = parseExpression();
+	expectToken(Token::RParen);
+	ASTPointer<Statement> trueBody = parseStatement();
+	ASTPointer<Statement> falseBody;
+	if (m_scanner->currentToken() == Token::Else)
+	{
+		m_scanner->next();
+		falseBody = parseStatement();
+		nodeFactory.setEndPositionFromNode(falseBody);
+	}
+	else
+		nodeFactory.setEndPositionFromNode(trueBody);
+	return nodeFactory.createNode<IfStatement>(condition, trueBody, falseBody);
+}
+
+ASTPointer<WhileStatement> Parser::parseWhileStatement()
+{
+	ASTNodeFactory nodeFactory(*this);
+	expectToken(Token::While);
+	expectToken(Token::LParen);
+	ASTPointer<Expression> condition = parseExpression();
+	expectToken(Token::RParen);
+	ASTPointer<Statement> body = parseStatement();
+	nodeFactory.setEndPositionFromNode(body);
+	return nodeFactory.createNode<WhileStatement>(condition, body);
+}
+
+ASTPointer<ForStatement> Parser::parseForStatement()
+{
+	ASTNodeFactory nodeFactory(*this);
+	ASTPointer<Statement> initExpression;
+	ASTPointer<Expression> conditionExpression;
+	ASTPointer<ExpressionStatement> loopExpression;
+	expectToken(Token::For);
+	expectToken(Token::LParen);
+
+	// LTODO: Maybe here have some predicate like peekExpression() instead of checking for semicolon and RParen?
+	if (m_scanner->currentToken() != Token::Semicolon)
+		initExpression = parseSimpleStatement();
+	expectToken(Token::Semicolon);
+
+	if (m_scanner->currentToken() != Token::Semicolon)
+		conditionExpression = parseExpression();
+	expectToken(Token::Semicolon);
+
+	if (m_scanner->currentToken() != Token::RParen)
+		loopExpression = parseExpressionStatement();
+	expectToken(Token::RParen);
+
+	ASTPointer<Statement> body = parseStatement();
+	nodeFactory.setEndPositionFromNode(body);
+	return nodeFactory.createNode<ForStatement>(initExpression,
+												conditionExpression,
+												loopExpression,
+												body);
+}
+
+ASTPointer<Statement> Parser::parseSimpleStatement()
+{
+	// These two cases are very hard to distinguish:
+	// x[7 * 20 + 3] a;  -  x[7 * 20 + 3] = 9;
+	// In the first case, x is a type name, in the second it is the name of a variable.
+	// As an extension, we can even have:
+	// `x.y.z[1][2] a;` and `x.y.z[1][2] = 10;`
+	// Where in the first, x.y.z leads to a type name where in the second, it accesses structs.
+	switch (peekStatementType())
+	{
+	case LookAheadInfo::VariableDeclarationStatement:
+		return parseVariableDeclarationStatement();
+	case LookAheadInfo::ExpressionStatement:
+		return parseExpressionStatement();
+	default:
+		break;
+	}
+
+	// At this point, we have 'Identifier "["' or 'Identifier "." Identifier' or 'ElementoryTypeName "["'.
+	// We parse '(Identifier ("." Identifier)* |ElementaryTypeName) ( "[" Expression "]" )+'
+	// until we can decide whether to hand this over to ExpressionStatement or create a
+	// VariableDeclarationStatement out of it.
+
+	vector<ASTPointer<PrimaryExpression>> path;
+	bool startedWithElementary = false;
+	if (m_scanner->currentToken() == Token::Identifier)
+		path.push_back(parseIdentifier());
+	else
+	{
+		startedWithElementary = true;
+		path.push_back(ASTNodeFactory(*this).createNode<ElementaryTypeNameExpression>(m_scanner->currentToken()));
+		m_scanner->next();
+	}
+	while (!startedWithElementary && m_scanner->currentToken() == Token::Period)
+	{
+		m_scanner->next();
+		path.push_back(parseIdentifier());
+	}
+	vector<pair<ASTPointer<Expression>, SourceLocation>> indices;
+	while (m_scanner->currentToken() == Token::LBrack)
+	{
+		expectToken(Token::LBrack);
+		ASTPointer<Expression> index;
+		if (m_scanner->currentToken() != Token::RBrack)
+			index = parseExpression();
+		SourceLocation indexLocation = path.front()->location();
+		indexLocation.end = endPosition();
+		indices.push_back(make_pair(index, indexLocation));
+		expectToken(Token::RBrack);
+	}
+
+	if (m_scanner->currentToken() == Token::Identifier || Token::isLocationSpecifier(m_scanner->currentToken()))
+		return parseVariableDeclarationStatement(typeNameIndexAccessStructure(path, indices));
+	else
+		return parseExpressionStatement(expressionFromIndexAccessStructure(path, indices));
+}
+
+ASTPointer<VariableDeclarationStatement> Parser::parseVariableDeclarationStatement(
+	ASTPointer<TypeName> const& _lookAheadArrayType
+)
+{
+	ASTNodeFactory nodeFactory(*this);
+	if (_lookAheadArrayType)
+		nodeFactory.setLocation(_lookAheadArrayType->location());
+	vector<ASTPointer<VariableDeclaration>> variables;
+	ASTPointer<Expression> value;
+	if (
+		!_lookAheadArrayType &&
+		m_scanner->currentToken() == Token::Var &&
+		m_scanner->peekNextToken() == Token::LParen
+	)
+	{
+		// Parse `var (a, b, ,, c) = ...` into a single VariableDeclarationStatement with multiple variables.
+		m_scanner->next();
+		m_scanner->next();
+		if (m_scanner->currentToken() != Token::RParen)
+			while (true)
+			{
+				ASTPointer<VariableDeclaration> var;
+				if (
+					m_scanner->currentToken() != Token::Comma &&
+					m_scanner->currentToken() != Token::RParen
+				)
+				{
+					ASTNodeFactory varDeclNodeFactory(*this);
+					varDeclNodeFactory.markEndPosition();
+					ASTPointer<ASTString> name = expectIdentifierToken();
+					var = varDeclNodeFactory.createNode<VariableDeclaration>(
+						ASTPointer<TypeName>(),
+						name,
+						ASTPointer<Expression>(),
+						VariableDeclaration::Visibility::Default
+					);
+				}
+				variables.push_back(var);
+				if (m_scanner->currentToken() == Token::RParen)
+					break;
+				else
+					expectToken(Token::Comma);
+			}
+		nodeFactory.markEndPosition();
+		m_scanner->next();
+	}
+	else
+	{
+		VarDeclParserOptions options;
+		options.allowVar = true;
+		options.allowLocationSpecifier = true;
+		variables.push_back(parseVariableDeclaration(options, _lookAheadArrayType));
+	}
+	if (m_scanner->currentToken() == Token::Assign)
+	{
+		m_scanner->next();
+		value = parseExpression();
+		nodeFactory.setEndPositionFromNode(value);
+	}
+	return nodeFactory.createNode<VariableDeclarationStatement>(variables, value);
+}
+
+ASTPointer<ExpressionStatement> Parser::parseExpressionStatement(
+	ASTPointer<Expression> const& _lookAheadIndexAccessStructure
+)
+{
+	ASTPointer<Expression> expression = parseExpression(_lookAheadIndexAccessStructure);
+	return ASTNodeFactory(*this, expression).createNode<ExpressionStatement>(expression);
+}
+
+ASTPointer<Expression> Parser::parseExpression(
+	ASTPointer<Expression> const& _lookAheadIndexAccessStructure
+)
+{
+	ASTPointer<Expression> expression = parseBinaryExpression(4, _lookAheadIndexAccessStructure);
+	if (!Token::isAssignmentOp(m_scanner->currentToken()))
+		return expression;
+	Token::Value assignmentOperator = expectAssignmentOperator();
+	ASTPointer<Expression> rightHandSide = parseExpression();
+	ASTNodeFactory nodeFactory(*this, expression);
+	nodeFactory.setEndPositionFromNode(rightHandSide);
+	return nodeFactory.createNode<Assignment>(expression, assignmentOperator, rightHandSide);
+}
+
+ASTPointer<Expression> Parser::parseBinaryExpression(
+	int _minPrecedence,
+	ASTPointer<Expression> const& _lookAheadIndexAccessStructure
+)
+{
+	ASTPointer<Expression> expression = parseUnaryExpression(_lookAheadIndexAccessStructure);
+	ASTNodeFactory nodeFactory(*this, expression);
+	int precedence = Token::precedence(m_scanner->currentToken());
+	for (; precedence >= _minPrecedence; --precedence)
+		while (Token::precedence(m_scanner->currentToken()) == precedence)
+		{
+			Token::Value op = m_scanner->currentToken();
+			m_scanner->next();
+			ASTPointer<Expression> right = parseBinaryExpression(precedence + 1);
+			nodeFactory.setEndPositionFromNode(right);
+			expression = nodeFactory.createNode<BinaryOperation>(expression, op, right);
+		}
+	return expression;
+}
+
+ASTPointer<Expression> Parser::parseUnaryExpression(
+	ASTPointer<Expression> const& _lookAheadIndexAccessStructure
+)
+{
+	ASTNodeFactory nodeFactory = _lookAheadIndexAccessStructure ?
+		ASTNodeFactory(*this, _lookAheadIndexAccessStructure) : ASTNodeFactory(*this);
+	Token::Value token = m_scanner->currentToken();
+	if (!_lookAheadIndexAccessStructure && (Token::isUnaryOp(token) || Token::isCountOp(token)))
+	{
+		// prefix expression
+		m_scanner->next();
+		ASTPointer<Expression> subExpression = parseUnaryExpression();
+		nodeFactory.setEndPositionFromNode(subExpression);
+		return nodeFactory.createNode<UnaryOperation>(token, subExpression, true);
+	}
+	else
+	{
+		// potential postfix expression
+		ASTPointer<Expression> subExpression = parseLeftHandSideExpression(_lookAheadIndexAccessStructure);
+		token = m_scanner->currentToken();
+		if (!Token::isCountOp(token))
+			return subExpression;
+		nodeFactory.markEndPosition();
+		m_scanner->next();
+		return nodeFactory.createNode<UnaryOperation>(token, subExpression, false);
+	}
+}
+
+ASTPointer<Expression> Parser::parseLeftHandSideExpression(
+	ASTPointer<Expression> const& _lookAheadIndexAccessStructure
+)
+{
+	ASTNodeFactory nodeFactory = _lookAheadIndexAccessStructure ?
+		ASTNodeFactory(*this, _lookAheadIndexAccessStructure) : ASTNodeFactory(*this);
+
+	ASTPointer<Expression> expression;
+	if (_lookAheadIndexAccessStructure)
+		expression = _lookAheadIndexAccessStructure;
+	else if (m_scanner->currentToken() == Token::New)
+	{
+		expectToken(Token::New);
+		ASTPointer<Identifier> contractName(parseIdentifier());
+		nodeFactory.setEndPositionFromNode(contractName);
+		expression = nodeFactory.createNode<NewExpression>(contractName);
+	}
+	else
+		expression = parsePrimaryExpression();
+
+	while (true)
+	{
+		switch (m_scanner->currentToken())
+		{
+		case Token::LBrack:
+		{
+			m_scanner->next();
+			ASTPointer<Expression> index;
+			if (m_scanner->currentToken() != Token::RBrack)
+				index = parseExpression();
+			nodeFactory.markEndPosition();
+			expectToken(Token::RBrack);
+			expression = nodeFactory.createNode<IndexAccess>(expression, index);
+		}
+		break;
+		case Token::Period:
+		{
+			m_scanner->next();
+			nodeFactory.markEndPosition();
+			expression = nodeFactory.createNode<MemberAccess>(expression, expectIdentifierToken());
+		}
+		break;
+		case Token::LParen:
+		{
+			m_scanner->next();
+			vector<ASTPointer<Expression>> arguments;
+			vector<ASTPointer<ASTString>> names;
+			std::tie(arguments, names) = parseFunctionCallArguments();
+			nodeFactory.markEndPosition();
+			expectToken(Token::RParen);
+			expression = nodeFactory.createNode<FunctionCall>(expression, arguments, names);
+		}
+		break;
+		default:
+			return expression;
+		}
+	}
+}
+
+ASTPointer<Expression> Parser::parsePrimaryExpression()
+{
+	ASTNodeFactory nodeFactory(*this);
+	Token::Value token = m_scanner->currentToken();
+	ASTPointer<Expression> expression;
+	switch (token)
+	{
+	case Token::TrueLiteral:
+	case Token::FalseLiteral:
+		expression = nodeFactory.createNode<Literal>(token, getLiteralAndAdvance());
+		break;
+	case Token::Number:
+		if (Token::isEtherSubdenomination(m_scanner->peekNextToken()))
+		{
+			ASTPointer<ASTString> literal = getLiteralAndAdvance();
+			nodeFactory.markEndPosition();
+			Literal::SubDenomination subdenomination = static_cast<Literal::SubDenomination>(m_scanner->currentToken());
+			m_scanner->next();
+			expression = nodeFactory.createNode<Literal>(token, literal, subdenomination);
+			break;
+		}
+		if (Token::isTimeSubdenomination(m_scanner->peekNextToken()))
+		{
+			ASTPointer<ASTString> literal = getLiteralAndAdvance();
+			nodeFactory.markEndPosition();
+			Literal::SubDenomination subdenomination = static_cast<Literal::SubDenomination>(m_scanner->currentToken());
+			m_scanner->next();
+			expression = nodeFactory.createNode<Literal>(token, literal, subdenomination);
+			break;
+		}
+		// fall-through
+	case Token::StringLiteral:
+		nodeFactory.markEndPosition();
+		expression = nodeFactory.createNode<Literal>(token, getLiteralAndAdvance());
+		break;
+	case Token::Identifier:
+		nodeFactory.markEndPosition();
+		expression = nodeFactory.createNode<Identifier>(getLiteralAndAdvance());
+		break;
+	case Token::LParen:
+	{
+		// Tuple or parenthesized expression.
+		// Special cases: () is empty tuple type, (x) is not a real tuple, (x,) is one-dimensional tuple
+		m_scanner->next();
+		vector<ASTPointer<Expression>> components;
+		if (m_scanner->currentToken() != Token::RParen)
+			while (true)
+			{
+				if (m_scanner->currentToken() != Token::Comma && m_scanner->currentToken() != Token::RParen)
+					components.push_back(parseExpression());
+				else
+					components.push_back(ASTPointer<Expression>());
+				if (m_scanner->currentToken() == Token::RParen)
+					break;
+				else if (m_scanner->currentToken() == Token::Comma)
+					m_scanner->next();
+			}
+		nodeFactory.markEndPosition();
+		expectToken(Token::RParen);
+		return nodeFactory.createNode<TupleExpression>(components);
+	}
+	default:
+		if (Token::isElementaryTypeName(token))
+		{
+			// used for casts
+			expression = nodeFactory.createNode<ElementaryTypeNameExpression>(token);
+			m_scanner->next();
+		}
+		else
+			fatalParserError(std::string("Expected primary expression."));
+		break;
+	}
+	return expression;
+}
+
+vector<ASTPointer<Expression>> Parser::parseFunctionCallListArguments()
+{
+	vector<ASTPointer<Expression>> arguments;
+	if (m_scanner->currentToken() != Token::RParen)
+	{
+		arguments.push_back(parseExpression());
+		while (m_scanner->currentToken() != Token::RParen)
+		{
+			expectToken(Token::Comma);
+			arguments.push_back(parseExpression());
+		}
+	}
+	return arguments;
+}
+
+pair<vector<ASTPointer<Expression>>, vector<ASTPointer<ASTString>>> Parser::parseFunctionCallArguments()
+{
+	pair<vector<ASTPointer<Expression>>, vector<ASTPointer<ASTString>>> ret;
+	Token::Value token = m_scanner->currentToken();
+	if (token == Token::LBrace)
+	{
+		// call({arg1 : 1, arg2 : 2 })
+		expectToken(Token::LBrace);
+		while (m_scanner->currentToken() != Token::RBrace)
+		{
+			ret.second.push_back(expectIdentifierToken());
+			expectToken(Token::Colon);
+			ret.first.push_back(parseExpression());
+
+			if (m_scanner->currentToken() == Token::Comma)
+				expectToken(Token::Comma);
+			else
+				break;
+		}
+		expectToken(Token::RBrace);
+	}
+	else
+		ret.first = parseFunctionCallListArguments();
+	return ret;
+}
+
+Parser::LookAheadInfo Parser::peekStatementType() const
+{
+	// Distinguish between variable declaration (and potentially assignment) and expression statement
+	// (which include assignments to other expressions and pre-declared variables).
+	// We have a variable declaration if we get a keyword that specifies a type name.
+	// If it is an identifier or an elementary type name followed by an identifier, we also have
+	// a variable declaration.
+	// If we get an identifier followed by a "[" or ".", it can be both ("lib.type[9] a;" or "variable.el[9] = 7;").
+	// In all other cases, we have an expression statement.
+	Token::Value token(m_scanner->currentToken());
+	bool mightBeTypeName = (Token::isElementaryTypeName(token) || token == Token::Identifier);
+
+	if (token == Token::Mapping || token == Token::Var)
+		return LookAheadInfo::VariableDeclarationStatement;
+	if (mightBeTypeName)
+	{
+		Token::Value next = m_scanner->peekNextToken();
+		if (next == Token::Identifier || Token::isLocationSpecifier(next))
+			return LookAheadInfo::VariableDeclarationStatement;
+		if (next == Token::LBrack || next == Token::Period)
+			return LookAheadInfo::IndexAccessStructure;
+	}
+	return LookAheadInfo::ExpressionStatement;
+}
+
+ASTPointer<TypeName> Parser::typeNameIndexAccessStructure(
+	vector<ASTPointer<PrimaryExpression>> const& _path,
+	vector<pair<ASTPointer<Expression>, SourceLocation>> const& _indices
+)
+{
+	solAssert(!_path.empty(), "");
+	ASTNodeFactory nodeFactory(*this);
+	SourceLocation location = _path.front()->location();
+	location.end = _path.back()->location().end;
+	nodeFactory.setLocation(location);
+
+	ASTPointer<TypeName> type;
+	if (auto typeName = dynamic_cast<ElementaryTypeNameExpression const*>(_path.front().get()))
+	{
+		solAssert(_path.size() == 1, "");
+		type = nodeFactory.createNode<ElementaryTypeName>(typeName->typeToken());
+	}
+	else
+	{
+		vector<ASTString> path;
+		for (auto const& el: _path)
+			path.push_back(dynamic_cast<Identifier const&>(*el).name());
+		type = nodeFactory.createNode<UserDefinedTypeName>(path);
+	}
+	for (auto const& lengthExpression: _indices)
+	{
+		nodeFactory.setLocation(lengthExpression.second);
+		type = nodeFactory.createNode<ArrayTypeName>(type, lengthExpression.first);
+	}
+	return type;
+}
+
+ASTPointer<Expression> Parser::expressionFromIndexAccessStructure(
+	vector<ASTPointer<PrimaryExpression>> const& _path,
+	vector<pair<ASTPointer<Expression>, SourceLocation>> const& _indices
+)
+{
+	solAssert(!_path.empty(), "");
+	ASTNodeFactory nodeFactory(*this, _path.front());
+	ASTPointer<Expression> expression(_path.front());
+	for (size_t i = 1; i < _path.size(); ++i)
+	{
+		SourceLocation location(_path.front()->location());
+		location.end = _path[i]->location().end;
+		nodeFactory.setLocation(location);
+		Identifier const& identifier = dynamic_cast<Identifier const&>(*_path[i]);
+		expression = nodeFactory.createNode<MemberAccess>(
+			expression,
+			make_shared<ASTString>(identifier.name())
+		);
+	}
+	for (auto const& index: _indices)
+	{
+		nodeFactory.setLocation(index.second);
+		expression = nodeFactory.createNode<IndexAccess>(expression, index.first);
+	}
+	return expression;
+}
+
+void Parser::expectToken(Token::Value _value)
+{
+	if (m_scanner->currentToken() != _value)
+		fatalParserError(std::string(string("Expected token ") + string(Token::name(_value))));
+	m_scanner->next();
+}
+
+Token::Value Parser::expectAssignmentOperator()
+{
+	Token::Value op = m_scanner->currentToken();
+	if (!Token::isAssignmentOp(op))
+		fatalParserError(std::string("Expected assignment operator"));
+	m_scanner->next();
+	return op;
+}
+
+ASTPointer<ASTString> Parser::expectIdentifierToken()
+{
+	if (m_scanner->currentToken() != Token::Identifier)
+		fatalParserError(std::string("Expected identifier"));
+	return getLiteralAndAdvance();
+}
+
+ASTPointer<ASTString> Parser::getLiteralAndAdvance()
+{
+	ASTPointer<ASTString> identifier = make_shared<ASTString>(m_scanner->currentLiteral());
+	m_scanner->next();
+	return identifier;
+}
+
+ASTPointer<ParameterList> Parser::createEmptyParameterList()
+{
+	ASTNodeFactory nodeFactory(*this);
+	nodeFactory.setLocationEmpty();
+	return nodeFactory.createNode<ParameterList>(vector<ASTPointer<VariableDeclaration>>());
+}
+
+void Parser::parserError(string const& _description)
+{
+	auto err = make_shared<Error>(Error::Type::ParserError);
+	*err <<
+		errinfo_sourceLocation(SourceLocation(position(), position(), sourceName())) <<
+		errinfo_comment(_description);
+
+	m_errors.push_back(err);
+}
+
+void Parser::fatalParserError(string const& _description)
+{
+	parserError(_description);
+	BOOST_THROW_EXCEPTION(FatalError());
+}
+
+}
+}
-- 
cgit