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@ -41,8 +41,11 @@ class Parser::ASTNodeFactory |
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public: |
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ASTNodeFactory(Parser const& _parser): |
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m_parser(_parser), m_location(_parser.getPosition(), -1, _parser.getSourceName()) {} |
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ASTNodeFactory(Parser const& _parser, ASTPointer<ASTNode> const& _childNode): |
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m_parser(_parser), m_location(_childNode->getLocation()) {} |
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void markEndPosition() { m_location.end = m_parser.getEndPosition(); } |
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void setLocation(Location const& _location) { m_location = _location; } |
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void setLocationEmpty() { m_location.end = m_location.start; } |
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/// Set the end position to the one of the given node.
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void setEndPositionFromNode(ASTPointer<ASTNode> const& _node) { m_location.end = _node->getLocation().end; } |
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@ -299,12 +302,20 @@ ASTPointer<EnumDefinition> Parser::parseEnumDefinition() |
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return nodeFactory.createNode<EnumDefinition>(name, members); |
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} |
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ASTPointer<VariableDeclaration> Parser::parseVariableDeclaration(VarDeclParserOptions const& _options) |
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ASTPointer<VariableDeclaration> Parser::parseVariableDeclaration( |
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VarDeclParserOptions const& _options, ASTPointer<TypeName> const& _lookAheadArrayType) |
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{ |
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ASTNodeFactory nodeFactory(*this); |
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ASTPointer<TypeName> type = parseTypeName(_options.allowVar); |
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if (type != nullptr) |
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nodeFactory.setEndPositionFromNode(type); |
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ASTNodeFactory nodeFactory = _lookAheadArrayType ? |
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ASTNodeFactory(*this, _lookAheadArrayType) : ASTNodeFactory(*this); |
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ASTPointer<TypeName> type; |
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if (_lookAheadArrayType) |
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type = _lookAheadArrayType; |
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else |
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{ |
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type = parseTypeName(_options.allowVar); |
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if (type != nullptr) |
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nodeFactory.setEndPositionFromNode(type); |
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} |
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bool isIndexed = false; |
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ASTPointer<ASTString> identifier; |
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Token::Value token = m_scanner->getCurrentToken(); |
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@ -407,6 +418,7 @@ ASTPointer<Identifier> Parser::parseIdentifier() |
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ASTPointer<TypeName> Parser::parseTypeName(bool _allowVar) |
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{ |
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ASTNodeFactory nodeFactory(*this); |
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ASTPointer<TypeName> type; |
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Token::Value token = m_scanner->getCurrentToken(); |
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if (Token::isElementaryTypeName(token)) |
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@ -421,9 +433,7 @@ ASTPointer<TypeName> Parser::parseTypeName(bool _allowVar) |
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m_scanner->next(); |
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} |
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else if (token == Token::Mapping) |
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{ |
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type = parseMapping(); |
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} |
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else if (token == Token::Identifier) |
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{ |
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ASTNodeFactory nodeFactory(*this); |
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@ -432,6 +442,18 @@ ASTPointer<TypeName> Parser::parseTypeName(bool _allowVar) |
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} |
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else |
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BOOST_THROW_EXCEPTION(createParserError("Expected type name")); |
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// Parse "[...]" postfixes for arrays.
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while (m_scanner->getCurrentToken() == Token::LBrack) |
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{ |
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m_scanner->next(); |
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ASTPointer<Expression> length; |
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if (m_scanner->getCurrentToken() != Token::RBrack) |
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length = parseExpression(); |
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nodeFactory.markEndPosition(); |
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expectToken(Token::RBrack); |
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type = nodeFactory.createNode<ArrayTypeName>(type, length); |
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} |
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return type; |
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} |
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@ -530,7 +552,7 @@ ASTPointer<Statement> Parser::parseStatement() |
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} |
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// fall-through
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default: |
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statement = parseVarDeclOrExprStmt(); |
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statement = parseSimpleStatement(); |
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} |
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expectToken(Token::Semicolon); |
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return statement; |
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@ -579,7 +601,7 @@ ASTPointer<ForStatement> Parser::parseForStatement() |
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// LTODO: Maybe here have some predicate like peekExpression() instead of checking for semicolon and RParen?
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if (m_scanner->getCurrentToken() != Token::Semicolon) |
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initExpression = parseVarDeclOrExprStmt(); |
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initExpression = parseSimpleStatement(); |
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expectToken(Token::Semicolon); |
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if (m_scanner->getCurrentToken() != Token::Semicolon) |
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@ -598,48 +620,88 @@ ASTPointer<ForStatement> Parser::parseForStatement() |
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body); |
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} |
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ASTPointer<Statement> Parser::parseVarDeclOrExprStmt() |
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ASTPointer<Statement> Parser::parseSimpleStatement() |
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{ |
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if (peekVariableDeclarationStatement()) |
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// These two cases are very hard to distinguish:
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// x[7 * 20 + 3] a; - x[7 * 20 + 3] = 9;
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// In the first case, x is a type name, in the second it is the name of a variable.
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int isVariableDeclaration = peekVariableDeclarationStatement(); |
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if (isVariableDeclaration == 1) |
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return parseVariableDeclarationStatement(); |
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else |
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else if (isVariableDeclaration == -1) |
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return parseExpressionStatement(); |
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// At this point, we have '(Identifier|ElementaryTypeName) "["'.
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// We parse '(Identifier|ElementaryTypeName) ( "[" Expression "]" )+' and then decide whether to hand this over
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// to ExpressionStatement or create a VariableDeclarationStatement out of it.
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ASTPointer<PrimaryExpression> primary; |
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if (m_scanner->getCurrentToken() == Token::Identifier) |
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primary = parseIdentifier(); |
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else |
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{ |
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primary = ASTNodeFactory(*this).createNode<ElementaryTypeNameExpression>(m_scanner->getCurrentToken()); |
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m_scanner->next(); |
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} |
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vector<pair<ASTPointer<Expression>, Location>> indices; |
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solAssert(m_scanner->getCurrentToken() == Token::LBrack, ""); |
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Location indexLocation = primary->getLocation(); |
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bool encounteredEmptyBrackets = false; |
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do |
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{ |
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expectToken(Token::LBrack); |
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ASTPointer<Expression> index; |
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if (m_scanner->getCurrentToken() == Token::RBrack) |
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encounteredEmptyBrackets = true; |
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else |
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index = parseExpression(); |
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indexLocation.end = getEndPosition(); |
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indices.push_back(make_pair(index, indexLocation)); |
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expectToken(Token::RBrack); |
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} |
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while (m_scanner->getCurrentToken() == Token::LBrack); |
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if (m_scanner->getCurrentToken() == Token::Identifier || encounteredEmptyBrackets) |
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return parseVariableDeclarationStatement(typeNameFromArrayIndexStructure(primary, indices)); |
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else |
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return parseExpressionStatement(expressionFromArrayIndexStructure(primary, indices)); |
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} |
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ASTPointer<VariableDeclarationStatement> Parser::parseVariableDeclarationStatement() |
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ASTPointer<VariableDeclarationStatement> Parser::parseVariableDeclarationStatement( |
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ASTPointer<TypeName> const& _lookAheadArrayType) |
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{ |
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ASTNodeFactory nodeFactory(*this); |
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VarDeclParserOptions options; |
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options.allowVar = true; |
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options.allowInitialValue = true; |
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ASTPointer<VariableDeclaration> variable = parseVariableDeclaration(options); |
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ASTPointer<VariableDeclaration> variable = parseVariableDeclaration(options, _lookAheadArrayType); |
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ASTNodeFactory nodeFactory(*this, variable); |
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return nodeFactory.createNode<VariableDeclarationStatement>(variable); |
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} |
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ASTPointer<ExpressionStatement> Parser::parseExpressionStatement() |
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ASTPointer<ExpressionStatement> Parser::parseExpressionStatement( |
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ASTPointer<Expression> const& _lookAheadArrayExpression) |
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{ |
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ASTNodeFactory nodeFactory(*this); |
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ASTPointer<Expression> expression = parseExpression(); |
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nodeFactory.setEndPositionFromNode(expression); |
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return nodeFactory.createNode<ExpressionStatement>(expression); |
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ASTPointer<Expression> expression = parseExpression(_lookAheadArrayExpression); |
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return ASTNodeFactory(*this, expression).createNode<ExpressionStatement>(expression); |
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} |
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ASTPointer<Expression> Parser::parseExpression() |
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ASTPointer<Expression> Parser::parseExpression( |
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ASTPointer<Expression> const& _lookAheadArrayExpression) |
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{ |
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ASTNodeFactory nodeFactory(*this); |
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ASTPointer<Expression> expression = parseBinaryExpression(); |
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ASTPointer<Expression> expression = parseBinaryExpression(4, _lookAheadArrayExpression); |
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if (!Token::isAssignmentOp(m_scanner->getCurrentToken())) |
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return expression; |
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Token::Value assignmentOperator = expectAssignmentOperator(); |
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ASTPointer<Expression> rightHandSide = parseExpression(); |
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ASTNodeFactory nodeFactory(*this, expression); |
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nodeFactory.setEndPositionFromNode(rightHandSide); |
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return nodeFactory.createNode<Assignment>(expression, assignmentOperator, rightHandSide); |
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} |
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ASTPointer<Expression> Parser::parseBinaryExpression(int _minPrecedence) |
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ASTPointer<Expression> Parser::parseBinaryExpression(int _minPrecedence, |
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ASTPointer<Expression> const& _lookAheadArrayExpression) |
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{ |
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ASTNodeFactory nodeFactory(*this); |
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ASTPointer<Expression> expression = parseUnaryExpression(); |
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ASTPointer<Expression> expression = parseUnaryExpression(_lookAheadArrayExpression); |
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ASTNodeFactory nodeFactory(*this, expression); |
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int precedence = Token::precedence(m_scanner->getCurrentToken()); |
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for (; precedence >= _minPrecedence; --precedence) |
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while (Token::precedence(m_scanner->getCurrentToken()) == precedence) |
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@ -653,11 +715,13 @@ ASTPointer<Expression> Parser::parseBinaryExpression(int _minPrecedence) |
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return expression; |
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} |
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ASTPointer<Expression> Parser::parseUnaryExpression() |
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ASTPointer<Expression> Parser::parseUnaryExpression( |
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ASTPointer<Expression> const& _lookAheadArrayExpression) |
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{ |
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ASTNodeFactory nodeFactory(*this); |
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ASTNodeFactory nodeFactory = _lookAheadArrayExpression ? |
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ASTNodeFactory(*this, _lookAheadArrayExpression) : ASTNodeFactory(*this); |
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Token::Value token = m_scanner->getCurrentToken(); |
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if (Token::isUnaryOp(token) || Token::isCountOp(token)) |
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if (!_lookAheadArrayExpression && (Token::isUnaryOp(token) || Token::isCountOp(token))) |
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{ |
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// prefix expression
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m_scanner->next(); |
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@ -668,7 +732,7 @@ ASTPointer<Expression> Parser::parseUnaryExpression() |
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else |
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{ |
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// potential postfix expression
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ASTPointer<Expression> subExpression = parseLeftHandSideExpression(); |
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ASTPointer<Expression> subExpression = parseLeftHandSideExpression(_lookAheadArrayExpression); |
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token = m_scanner->getCurrentToken(); |
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if (!Token::isCountOp(token)) |
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return subExpression; |
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@ -678,11 +742,16 @@ ASTPointer<Expression> Parser::parseUnaryExpression() |
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} |
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} |
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ASTPointer<Expression> Parser::parseLeftHandSideExpression() |
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ASTPointer<Expression> Parser::parseLeftHandSideExpression( |
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ASTPointer<Expression> const& _lookAheadArrayExpression) |
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{ |
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ASTNodeFactory nodeFactory(*this); |
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ASTNodeFactory nodeFactory = _lookAheadArrayExpression ? |
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ASTNodeFactory(*this, _lookAheadArrayExpression) : ASTNodeFactory(*this); |
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ASTPointer<Expression> expression; |
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if (m_scanner->getCurrentToken() == Token::New) |
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if (_lookAheadArrayExpression) |
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expression = _lookAheadArrayExpression; |
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else if (m_scanner->getCurrentToken() == Token::New) |
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{ |
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expectToken(Token::New); |
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ASTPointer<Identifier> contractName(parseIdentifier()); |
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@ -774,10 +843,7 @@ ASTPointer<Expression> Parser::parsePrimaryExpression() |
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m_scanner->next(); |
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} |
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else |
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{ |
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BOOST_THROW_EXCEPTION(createParserError("Expected primary expression.")); |
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return ASTPointer<Expression>(); // this is not reached
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} |
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break; |
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} |
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return expression; |
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@ -824,18 +890,55 @@ pair<vector<ASTPointer<Expression>>, vector<ASTPointer<ASTString>>> Parser::pars |
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return ret; |
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} |
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int Parser::peekVariableDeclarationStatement() const |
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{ |
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// Distinguish between variable declaration (and potentially assignment) and expression statement
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// (which include assignments to other expressions and pre-declared variables).
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// We have a variable declaration if we get a keyword that specifies a type name.
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// If it is an identifier or an elementary type name followed by an identifier, we also have
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// a variable declaration.
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// If we get an identifier followed by a "[", it can be both ("type[9] a;" or "arr[9] = 7;").
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// In all other cases, we have an expression statement.
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Token::Value token(m_scanner->getCurrentToken()); |
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bool mightBeTypeName = (Token::isElementaryTypeName(token) || token == Token::Identifier); |
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if (token == Token::Mapping || token == Token::Var || |
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(mightBeTypeName && m_scanner->peekNextToken() == Token::Identifier)) |
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return 1; |
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if (mightBeTypeName && m_scanner->peekNextToken() == Token::LBrack) |
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return 0; |
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return -1; |
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} |
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bool Parser::peekVariableDeclarationStatement() |
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ASTPointer<TypeName> Parser::typeNameFromArrayIndexStructure( |
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ASTPointer<PrimaryExpression> const& _primary, vector<pair<ASTPointer<Expression>, Location>> const& _indices) |
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{ |
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// distinguish between variable declaration (and potentially assignment) and expression statement
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// (which include assignments to other expressions and pre-declared variables)
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// We have a variable declaration if we get a keyword that specifies a type name, or
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// in the case of a user-defined type, we have two identifiers following each other.
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return (m_scanner->getCurrentToken() == Token::Mapping || |
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m_scanner->getCurrentToken() == Token::Var || |
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((Token::isElementaryTypeName(m_scanner->getCurrentToken()) || |
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m_scanner->getCurrentToken() == Token::Identifier) && |
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m_scanner->peekNextToken() == Token::Identifier)); |
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ASTNodeFactory nodeFactory(*this, _primary); |
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ASTPointer<TypeName> type; |
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if (auto identifier = dynamic_cast<Identifier const*>(_primary.get())) |
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type = nodeFactory.createNode<UserDefinedTypeName>(make_shared<ASTString>(identifier->getName())); |
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else if (auto typeName = dynamic_cast<ElementaryTypeNameExpression const*>(_primary.get())) |
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type = nodeFactory.createNode<ElementaryTypeName>(typeName->getTypeToken()); |
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else |
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solAssert(false, "Invalid type name for array look-ahead."); |
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for (auto const& lengthExpression: _indices) |
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{ |
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nodeFactory.setLocation(lengthExpression.second); |
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type = nodeFactory.createNode<ArrayTypeName>(type, lengthExpression.first); |
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} |
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return type; |
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} |
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ASTPointer<Expression> Parser::expressionFromArrayIndexStructure( |
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ASTPointer<PrimaryExpression> const& _primary, vector<pair<ASTPointer<Expression>, Location>> const& _indices) |
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{ |
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ASTNodeFactory nodeFactory(*this, _primary); |
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ASTPointer<Expression> expression(_primary); |
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for (auto const& index: _indices) |
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{ |
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nodeFactory.setLocation(index.second); |
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expression = nodeFactory.createNode<IndexAccess>(expression, index.first); |
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} |
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return expression; |
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} |
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void Parser::expectToken(Token::Value _value) |
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Christian
10 years ago