mirror of
https://github.com/ethereum/solidity
synced 2023-10-03 13:03:40 +00:00
1087 lines
34 KiB
C++
1087 lines
34 KiB
C++
/*
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This file is part of cpp-ethereum.
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cpp-ethereum is free software: you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation, either version 3 of the License, or
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(at your option) any later version.
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cpp-ethereum is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with cpp-ethereum. If not, see <http://www.gnu.org/licenses/>.
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*/
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/**
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* @author Christian <c@ethdev.com>
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* @date 2014
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* Solidity parser.
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*/
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#include <vector>
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#include <libdevcore/Log.h>
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#include <libevmasm/SourceLocation.h>
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#include <libsolidity/Parser.h>
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#include <libsolidity/Scanner.h>
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#include <libsolidity/Exceptions.h>
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#include <libsolidity/InterfaceHandler.h>
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using namespace std;
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namespace dev
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{
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namespace solidity
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{
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/// AST node factory that also tracks the begin and end position of an AST node
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/// while it is being parsed
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class Parser::ASTNodeFactory
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{
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public:
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ASTNodeFactory(Parser const& _parser):
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m_parser(_parser), m_location(_parser.position(), -1, _parser.sourceName()) {}
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ASTNodeFactory(Parser const& _parser, ASTPointer<ASTNode> const& _childNode):
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m_parser(_parser), m_location(_childNode->location()) {}
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void markEndPosition() { m_location.end = m_parser.endPosition(); }
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void setLocation(SourceLocation 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->location().end; }
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template <class NodeType, typename... Args>
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ASTPointer<NodeType> createNode(Args&& ... _args)
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{
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if (m_location.end < 0)
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markEndPosition();
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return make_shared<NodeType>(m_location, forward<Args>(_args)...);
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}
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private:
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Parser const& m_parser;
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SourceLocation m_location;
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};
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ASTPointer<SourceUnit> Parser::parse(shared_ptr<Scanner> const& _scanner)
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{
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m_scanner = _scanner;
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ASTNodeFactory nodeFactory(*this);
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vector<ASTPointer<ASTNode>> nodes;
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while (m_scanner->currentToken() != Token::EOS)
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{
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switch (m_scanner->currentToken())
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{
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case Token::Import:
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nodes.push_back(parseImportDirective());
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break;
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case Token::Contract:
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nodes.push_back(parseContractDefinition());
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break;
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default:
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BOOST_THROW_EXCEPTION(createParserError(std::string("Expected import directive or contract definition.")));
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}
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}
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return nodeFactory.createNode<SourceUnit>(nodes);
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}
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std::shared_ptr<const string> const& Parser::sourceName() const
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{
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return m_scanner->sourceName();
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}
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int Parser::position() const
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{
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return m_scanner->currentLocation().start;
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}
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int Parser::endPosition() const
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{
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return m_scanner->currentLocation().end;
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}
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ASTPointer<ImportDirective> Parser::parseImportDirective()
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{
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ASTNodeFactory nodeFactory(*this);
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expectToken(Token::Import);
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if (m_scanner->currentToken() != Token::StringLiteral)
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BOOST_THROW_EXCEPTION(createParserError("Expected string literal (URL)."));
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ASTPointer<ASTString> url = getLiteralAndAdvance();
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nodeFactory.markEndPosition();
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expectToken(Token::Semicolon);
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return nodeFactory.createNode<ImportDirective>(url);
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}
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ASTPointer<ContractDefinition> Parser::parseContractDefinition()
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{
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ASTNodeFactory nodeFactory(*this);
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ASTPointer<ASTString> docString;
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if (m_scanner->currentCommentLiteral() != "")
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docString = make_shared<ASTString>(m_scanner->currentCommentLiteral());
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expectToken(Token::Contract);
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ASTPointer<ASTString> name = expectIdentifierToken();
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vector<ASTPointer<InheritanceSpecifier>> baseContracts;
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vector<ASTPointer<StructDefinition>> structs;
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vector<ASTPointer<EnumDefinition>> enums;
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vector<ASTPointer<VariableDeclaration>> stateVariables;
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vector<ASTPointer<FunctionDefinition>> functions;
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vector<ASTPointer<ModifierDefinition>> modifiers;
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vector<ASTPointer<EventDefinition>> events;
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if (m_scanner->currentToken() == Token::Is)
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do
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{
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m_scanner->next();
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baseContracts.push_back(parseInheritanceSpecifier());
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}
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while (m_scanner->currentToken() == Token::Comma);
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expectToken(Token::LBrace);
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while (true)
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{
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Token::Value currentTokenValue= m_scanner->currentToken();
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if (currentTokenValue == Token::RBrace)
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break;
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else if (currentTokenValue == Token::Function)
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functions.push_back(parseFunctionDefinition(name.get()));
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else if (currentTokenValue == Token::Struct)
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structs.push_back(parseStructDefinition());
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else if (currentTokenValue == Token::Enum)
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enums.push_back(parseEnumDefinition());
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else if (
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currentTokenValue == Token::Identifier ||
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currentTokenValue == Token::Mapping ||
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Token::isElementaryTypeName(currentTokenValue)
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)
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{
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VarDeclParserOptions options;
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options.isStateVariable = true;
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options.allowInitialValue = true;
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stateVariables.push_back(parseVariableDeclaration(options));
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expectToken(Token::Semicolon);
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}
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else if (currentTokenValue == Token::Modifier)
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modifiers.push_back(parseModifierDefinition());
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else if (currentTokenValue == Token::Event)
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events.push_back(parseEventDefinition());
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else
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BOOST_THROW_EXCEPTION(createParserError("Function, variable, struct or modifier declaration expected."));
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}
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nodeFactory.markEndPosition();
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expectToken(Token::RBrace);
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return nodeFactory.createNode<ContractDefinition>(
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name,
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docString,
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baseContracts,
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structs,
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enums,
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stateVariables,
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functions,
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modifiers,
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events
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);
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}
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ASTPointer<InheritanceSpecifier> Parser::parseInheritanceSpecifier()
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{
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ASTNodeFactory nodeFactory(*this);
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ASTPointer<Identifier> name(parseIdentifier());
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vector<ASTPointer<Expression>> arguments;
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if (m_scanner->currentToken() == Token::LParen)
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{
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m_scanner->next();
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arguments = parseFunctionCallListArguments();
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nodeFactory.markEndPosition();
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expectToken(Token::RParen);
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}
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else
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nodeFactory.setEndPositionFromNode(name);
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return nodeFactory.createNode<InheritanceSpecifier>(name, arguments);
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}
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Declaration::Visibility Parser::parseVisibilitySpecifier(Token::Value _token)
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{
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Declaration::Visibility visibility(Declaration::Visibility::Default);
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if (_token == Token::Public)
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visibility = Declaration::Visibility::Public;
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else if (_token == Token::Internal)
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visibility = Declaration::Visibility::Internal;
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else if (_token == Token::Private)
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visibility = Declaration::Visibility::Private;
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else if (_token == Token::External)
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visibility = Declaration::Visibility::External;
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else
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solAssert(false, "Invalid visibility specifier.");
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m_scanner->next();
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return visibility;
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}
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ASTPointer<FunctionDefinition> Parser::parseFunctionDefinition(ASTString const* _contractName)
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{
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ASTNodeFactory nodeFactory(*this);
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ASTPointer<ASTString> docstring;
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if (m_scanner->currentCommentLiteral() != "")
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docstring = make_shared<ASTString>(m_scanner->currentCommentLiteral());
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expectToken(Token::Function);
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ASTPointer<ASTString> name;
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if (m_scanner->currentToken() == Token::LParen)
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name = make_shared<ASTString>(); // anonymous function
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else
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name = expectIdentifierToken();
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VarDeclParserOptions options;
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options.allowLocationSpecifier = true;
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ASTPointer<ParameterList> parameters(parseParameterList(options));
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bool isDeclaredConst = false;
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Declaration::Visibility visibility(Declaration::Visibility::Default);
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vector<ASTPointer<ModifierInvocation>> modifiers;
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while (true)
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{
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Token::Value token = m_scanner->currentToken();
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if (token == Token::Const)
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{
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isDeclaredConst = true;
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m_scanner->next();
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}
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else if (token == Token::Identifier)
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modifiers.push_back(parseModifierInvocation());
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else if (Token::isVisibilitySpecifier(token))
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{
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if (visibility != Declaration::Visibility::Default)
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BOOST_THROW_EXCEPTION(createParserError("Multiple visibility specifiers."));
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visibility = parseVisibilitySpecifier(token);
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}
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else
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break;
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}
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ASTPointer<ParameterList> returnParameters;
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if (m_scanner->currentToken() == Token::Returns)
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{
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bool const permitEmptyParameterList = false;
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m_scanner->next();
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returnParameters = parseParameterList(options, permitEmptyParameterList);
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}
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else
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returnParameters = createEmptyParameterList();
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ASTPointer<Block> block = ASTPointer<Block>();
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nodeFactory.markEndPosition();
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if (m_scanner->currentToken() != Token::Semicolon)
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{
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block = parseBlock();
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nodeFactory.setEndPositionFromNode(block);
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}
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else
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m_scanner->next(); // just consume the ';'
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bool const c_isConstructor = (_contractName && *name == *_contractName);
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return nodeFactory.createNode<FunctionDefinition>(name, visibility, c_isConstructor, docstring,
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parameters, isDeclaredConst, modifiers,
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returnParameters, block);
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}
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ASTPointer<StructDefinition> Parser::parseStructDefinition()
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{
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ASTNodeFactory nodeFactory(*this);
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expectToken(Token::Struct);
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ASTPointer<ASTString> name = expectIdentifierToken();
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vector<ASTPointer<VariableDeclaration>> members;
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expectToken(Token::LBrace);
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while (m_scanner->currentToken() != Token::RBrace)
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{
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members.push_back(parseVariableDeclaration());
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expectToken(Token::Semicolon);
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}
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nodeFactory.markEndPosition();
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expectToken(Token::RBrace);
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return nodeFactory.createNode<StructDefinition>(name, members);
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}
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ASTPointer<EnumValue> Parser::parseEnumValue()
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{
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ASTNodeFactory nodeFactory(*this);
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nodeFactory.markEndPosition();
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return nodeFactory.createNode<EnumValue>(expectIdentifierToken());
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}
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ASTPointer<EnumDefinition> Parser::parseEnumDefinition()
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{
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ASTNodeFactory nodeFactory(*this);
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expectToken(Token::Enum);
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ASTPointer<ASTString> name = expectIdentifierToken();
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vector<ASTPointer<EnumValue>> members;
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expectToken(Token::LBrace);
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while (m_scanner->currentToken() != Token::RBrace)
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{
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members.push_back(parseEnumValue());
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if (m_scanner->currentToken() == Token::RBrace)
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break;
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expectToken(Token::Comma);
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if (m_scanner->currentToken() != Token::Identifier)
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BOOST_THROW_EXCEPTION(createParserError("Expected Identifier after ','"));
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}
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nodeFactory.markEndPosition();
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expectToken(Token::RBrace);
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return nodeFactory.createNode<EnumDefinition>(name, members);
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}
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ASTPointer<VariableDeclaration> Parser::parseVariableDeclaration(
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VarDeclParserOptions const& _options,
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ASTPointer<TypeName> const& _lookAheadArrayType
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)
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{
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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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bool isDeclaredConst = false;
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Declaration::Visibility visibility(Declaration::Visibility::Default);
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VariableDeclaration::Location location = VariableDeclaration::Location::Default;
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ASTPointer<ASTString> identifier;
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while (true)
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{
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Token::Value token = m_scanner->currentToken();
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if (_options.isStateVariable && Token::isVariableVisibilitySpecifier(token))
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{
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if (visibility != Declaration::Visibility::Default)
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BOOST_THROW_EXCEPTION(createParserError("Visibility already specified."));
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visibility = parseVisibilitySpecifier(token);
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}
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else
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{
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if (_options.allowIndexed && token == Token::Indexed)
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isIndexed = true;
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else if (token == Token::Const)
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isDeclaredConst = true;
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else if (_options.allowLocationSpecifier && Token::isLocationSpecifier(token))
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{
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if (location != VariableDeclaration::Location::Default)
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BOOST_THROW_EXCEPTION(createParserError("Location already specified."));
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if (!type)
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BOOST_THROW_EXCEPTION(createParserError("Location specifier needs explicit type name."));
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location = (
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token == Token::Memory ?
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VariableDeclaration::Location::Memory :
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VariableDeclaration::Location::Storage
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);
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}
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else
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break;
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m_scanner->next();
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}
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}
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nodeFactory.markEndPosition();
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if (_options.allowEmptyName && m_scanner->currentToken() != Token::Identifier)
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{
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identifier = make_shared<ASTString>("");
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solAssert(type != nullptr, "");
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nodeFactory.setEndPositionFromNode(type);
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}
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else
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identifier = expectIdentifierToken();
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ASTPointer<Expression> value;
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if (_options.allowInitialValue)
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{
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if (m_scanner->currentToken() == Token::Assign)
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{
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m_scanner->next();
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value = parseExpression();
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nodeFactory.setEndPositionFromNode(value);
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}
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}
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return nodeFactory.createNode<VariableDeclaration>(
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type,
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identifier,
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value,
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visibility,
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_options.isStateVariable,
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isIndexed,
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isDeclaredConst,
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location
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);
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}
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ASTPointer<ModifierDefinition> Parser::parseModifierDefinition()
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{
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ScopeGuard resetModifierFlag([this]() { m_insideModifier = false; });
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m_insideModifier = true;
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ASTNodeFactory nodeFactory(*this);
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ASTPointer<ASTString> docstring;
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if (m_scanner->currentCommentLiteral() != "")
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docstring = make_shared<ASTString>(m_scanner->currentCommentLiteral());
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expectToken(Token::Modifier);
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ASTPointer<ASTString> name(expectIdentifierToken());
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ASTPointer<ParameterList> parameters;
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if (m_scanner->currentToken() == Token::LParen)
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{
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VarDeclParserOptions options;
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options.allowIndexed = true;
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options.allowLocationSpecifier = true;
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parameters = parseParameterList(options);
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}
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else
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parameters = createEmptyParameterList();
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ASTPointer<Block> block = parseBlock();
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nodeFactory.setEndPositionFromNode(block);
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return nodeFactory.createNode<ModifierDefinition>(name, docstring, parameters, block);
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}
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ASTPointer<EventDefinition> Parser::parseEventDefinition()
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{
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ASTNodeFactory nodeFactory(*this);
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ASTPointer<ASTString> docstring;
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if (m_scanner->currentCommentLiteral() != "")
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docstring = make_shared<ASTString>(m_scanner->currentCommentLiteral());
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expectToken(Token::Event);
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ASTPointer<ASTString> name(expectIdentifierToken());
|
|
ASTPointer<ParameterList> parameters;
|
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if (m_scanner->currentToken() == Token::LParen)
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{
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VarDeclParserOptions options;
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options.allowIndexed = true;
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parameters = parseParameterList(options);
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}
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else
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parameters = createEmptyParameterList();
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bool anonymous = false;
|
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if (m_scanner->currentToken() == Token::Anonymous)
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{
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anonymous = true;
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m_scanner->next();
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}
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nodeFactory.markEndPosition();
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expectToken(Token::Semicolon);
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return nodeFactory.createNode<EventDefinition>(name, docstring, parameters, anonymous);
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}
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ASTPointer<ModifierInvocation> Parser::parseModifierInvocation()
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{
|
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ASTNodeFactory nodeFactory(*this);
|
|
ASTPointer<Identifier> name(parseIdentifier());
|
|
vector<ASTPointer<Expression>> arguments;
|
|
if (m_scanner->currentToken() == Token::LParen)
|
|
{
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|
m_scanner->next();
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arguments = parseFunctionCallListArguments();
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|
nodeFactory.markEndPosition();
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expectToken(Token::RParen);
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}
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else
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nodeFactory.setEndPositionFromNode(name);
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return nodeFactory.createNode<ModifierInvocation>(name, arguments);
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|
}
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ASTPointer<Identifier> Parser::parseIdentifier()
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{
|
|
ASTNodeFactory nodeFactory(*this);
|
|
nodeFactory.markEndPosition();
|
|
return nodeFactory.createNode<Identifier>(expectIdentifierToken());
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|
}
|
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ASTPointer<TypeName> Parser::parseTypeName(bool _allowVar)
|
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{
|
|
ASTNodeFactory nodeFactory(*this);
|
|
ASTPointer<TypeName> type;
|
|
Token::Value token = m_scanner->currentToken();
|
|
if (Token::isElementaryTypeName(token))
|
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{
|
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type = ASTNodeFactory(*this).createNode<ElementaryTypeName>(token);
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m_scanner->next();
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}
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else if (token == Token::Var)
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{
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|
if (!_allowVar)
|
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BOOST_THROW_EXCEPTION(createParserError("Expected explicit type name."));
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|
m_scanner->next();
|
|
}
|
|
else if (token == Token::Mapping)
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type = parseMapping();
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|
else if (token == Token::Identifier)
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{
|
|
ASTNodeFactory nodeFactory(*this);
|
|
nodeFactory.markEndPosition();
|
|
type = nodeFactory.createNode<UserDefinedTypeName>(expectIdentifierToken());
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}
|
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else
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|
BOOST_THROW_EXCEPTION(createParserError("Expected type name"));
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|
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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();
|
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nodeFactory.markEndPosition();
|
|
expectToken(Token::RBrack);
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|
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()))
|
|
BOOST_THROW_EXCEPTION(createParserError("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::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.
|
|
switch (peekStatementType())
|
|
{
|
|
case LookAheadInfo::VariableDeclarationStatement:
|
|
return parseVariableDeclarationStatement();
|
|
case LookAheadInfo::ExpressionStatement:
|
|
return parseExpressionStatement();
|
|
default:
|
|
break;
|
|
}
|
|
|
|
// At this point, we have '(Identifier|ElementaryTypeName) "["'.
|
|
// We parse '(Identifier|ElementaryTypeName) ( "[" Expression "]" )+' and then decide whether to hand this over
|
|
// to ExpressionStatement or create a VariableDeclarationStatement out of it.
|
|
ASTPointer<PrimaryExpression> primary;
|
|
if (m_scanner->currentToken() == Token::Identifier)
|
|
primary = parseIdentifier();
|
|
else
|
|
{
|
|
primary = ASTNodeFactory(*this).createNode<ElementaryTypeNameExpression>(m_scanner->currentToken());
|
|
m_scanner->next();
|
|
}
|
|
vector<pair<ASTPointer<Expression>, SourceLocation>> indices;
|
|
solAssert(m_scanner->currentToken() == Token::LBrack, "");
|
|
SourceLocation indexLocation = primary->location();
|
|
do
|
|
{
|
|
expectToken(Token::LBrack);
|
|
ASTPointer<Expression> index;
|
|
if (m_scanner->currentToken() != Token::RBrack)
|
|
index = parseExpression();
|
|
indexLocation.end = endPosition();
|
|
indices.push_back(make_pair(index, indexLocation));
|
|
expectToken(Token::RBrack);
|
|
}
|
|
while (m_scanner->currentToken() == Token::LBrack);
|
|
|
|
if (m_scanner->currentToken() == Token::Identifier || Token::isLocationSpecifier(m_scanner->currentToken()))
|
|
return parseVariableDeclarationStatement(typeNameIndexAccessStructure(primary, indices));
|
|
else
|
|
return parseExpressionStatement(expressionFromIndexAccessStructure(primary, indices));
|
|
}
|
|
|
|
ASTPointer<VariableDeclarationStatement> Parser::parseVariableDeclarationStatement(
|
|
ASTPointer<TypeName> const& _lookAheadArrayType)
|
|
{
|
|
VarDeclParserOptions options;
|
|
options.allowVar = true;
|
|
options.allowInitialValue = true;
|
|
options.allowLocationSpecifier = true;
|
|
ASTPointer<VariableDeclaration> variable = parseVariableDeclaration(options, _lookAheadArrayType);
|
|
ASTNodeFactory nodeFactory(*this, variable);
|
|
return nodeFactory.createNode<VariableDeclarationStatement>(variable);
|
|
}
|
|
|
|
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:
|
|
{
|
|
m_scanner->next();
|
|
ASTPointer<Expression> expression = parseExpression();
|
|
expectToken(Token::RParen);
|
|
return expression;
|
|
}
|
|
default:
|
|
if (Token::isElementaryTypeName(token))
|
|
{
|
|
// used for casts
|
|
expression = nodeFactory.createNode<ElementaryTypeNameExpression>(token);
|
|
m_scanner->next();
|
|
}
|
|
else
|
|
BOOST_THROW_EXCEPTION(createParserError("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 "[", it can be both ("type[9] a;" or "arr[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 (m_scanner->peekNextToken() == Token::LBrack)
|
|
return LookAheadInfo::IndexAccessStructure;
|
|
}
|
|
return LookAheadInfo::ExpressionStatement;
|
|
}
|
|
|
|
ASTPointer<TypeName> Parser::typeNameIndexAccessStructure(
|
|
ASTPointer<PrimaryExpression> const& _primary, vector<pair<ASTPointer<Expression>, SourceLocation>> const& _indices)
|
|
{
|
|
ASTNodeFactory nodeFactory(*this, _primary);
|
|
ASTPointer<TypeName> type;
|
|
if (auto identifier = dynamic_cast<Identifier const*>(_primary.get()))
|
|
type = nodeFactory.createNode<UserDefinedTypeName>(make_shared<ASTString>(identifier->name()));
|
|
else if (auto typeName = dynamic_cast<ElementaryTypeNameExpression const*>(_primary.get()))
|
|
type = nodeFactory.createNode<ElementaryTypeName>(typeName->typeToken());
|
|
else
|
|
solAssert(false, "Invalid type name for array look-ahead.");
|
|
for (auto const& lengthExpression: _indices)
|
|
{
|
|
nodeFactory.setLocation(lengthExpression.second);
|
|
type = nodeFactory.createNode<ArrayTypeName>(type, lengthExpression.first);
|
|
}
|
|
return type;
|
|
}
|
|
|
|
ASTPointer<Expression> Parser::expressionFromIndexAccessStructure(
|
|
ASTPointer<PrimaryExpression> const& _primary, vector<pair<ASTPointer<Expression>, SourceLocation>> const& _indices)
|
|
{
|
|
ASTNodeFactory nodeFactory(*this, _primary);
|
|
ASTPointer<Expression> expression(_primary);
|
|
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)
|
|
BOOST_THROW_EXCEPTION(createParserError(string("Expected token ") + string(Token::name(_value))));
|
|
m_scanner->next();
|
|
}
|
|
|
|
Token::Value Parser::expectAssignmentOperator()
|
|
{
|
|
Token::Value op = m_scanner->currentToken();
|
|
if (!Token::isAssignmentOp(op))
|
|
BOOST_THROW_EXCEPTION(createParserError("Expected assignment operator"));
|
|
m_scanner->next();
|
|
return op;
|
|
}
|
|
|
|
ASTPointer<ASTString> Parser::expectIdentifierToken()
|
|
{
|
|
if (m_scanner->currentToken() != Token::Identifier)
|
|
BOOST_THROW_EXCEPTION(createParserError("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>>());
|
|
}
|
|
|
|
ParserError Parser::createParserError(string const& _description) const
|
|
{
|
|
return ParserError() <<
|
|
errinfo_sourceLocation(SourceLocation(position(), position(), sourceName())) <<
|
|
errinfo_comment(_description);
|
|
}
|
|
|
|
|
|
}
|
|
}
|