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/*
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.
*/
#pragma once
#include "libsolidity/AST.h"
namespace dev
{
namespace solidity
{
class Scanner;
class Parser
{
public:
Parser() {}
ASTPointer<SourceUnit> parse(std::shared_ptr<Scanner> const& _scanner);
std::shared_ptr<std::string const> const& getSourceName() const;
private:
class ASTNodeFactory;
/// Start position of the current token
int getPosition() const;
/// End position of the current token
int getEndPosition() const;
struct VarDeclParserOptions {
VarDeclParserOptions() {}
bool allowVar = false;
bool isStateVariable = false;
bool allowIndexed = false;
bool allowEmptyName = false;
bool allowInitialValue = false;
};
///@{
///@name Parsing functions for the AST nodes
ASTPointer<ImportDirective> parseImportDirective();
ASTPointer<ContractDefinition> parseContractDefinition();
ASTPointer<InheritanceSpecifier> parseInheritanceSpecifier();
Declaration::Visibility parseVisibilitySpecifier(Token::Value _token);
ASTPointer<FunctionDefinition> parseFunctionDefinition(ASTString const* _contractName);
ASTPointer<StructDefinition> parseStructDefinition();
ASTPointer<EnumDefinition> parseEnumDefinition();
ASTPointer<EnumValue> parseEnumValue();
ASTPointer<VariableDeclaration> parseVariableDeclaration(
VarDeclParserOptions const& _options = VarDeclParserOptions(),
ASTPointer<TypeName> const& _lookAheadArrayType = ASTPointer<TypeName>());
ASTPointer<ModifierDefinition> parseModifierDefinition();
ASTPointer<EventDefinition> parseEventDefinition();
ASTPointer<ModifierInvocation> parseModifierInvocation();
ASTPointer<Identifier> parseIdentifier();
ASTPointer<TypeName> parseTypeName(bool _allowVar);
ASTPointer<Mapping> parseMapping();
ASTPointer<ParameterList> parseParameterList(bool _allowEmpty = true, bool _allowIndexed = false);
ASTPointer<Block> parseBlock();
ASTPointer<Statement> parseStatement();
ASTPointer<IfStatement> parseIfStatement();
ASTPointer<WhileStatement> parseWhileStatement();
ASTPointer<ForStatement> parseForStatement();
/// A "simple statement" can be a variable declaration statement or an expression statement.
ASTPointer<Statement> parseSimpleStatement();
ASTPointer<VariableDeclarationStatement> parseVariableDeclarationStatement(
ASTPointer<TypeName> const& _lookAheadArrayType = ASTPointer<TypeName>());
ASTPointer<ExpressionStatement> parseExpressionStatement(
ASTPointer<Expression> const& _lookAheadIndexAccessStructure = ASTPointer<Expression>());
ASTPointer<Expression> parseExpression(
ASTPointer<Expression> const& _lookAheadIndexAccessStructure = ASTPointer<Expression>());
ASTPointer<Expression> parseBinaryExpression(int _minPrecedence = 4,
ASTPointer<Expression> const& _lookAheadIndexAccessStructure = ASTPointer<Expression>());
ASTPointer<Expression> parseUnaryExpression(
ASTPointer<Expression> const& _lookAheadIndexAccessStructure = ASTPointer<Expression>());
ASTPointer<Expression> parseLeftHandSideExpression(
ASTPointer<Expression> const& _lookAheadIndexAccessStructure = ASTPointer<Expression>());
ASTPointer<Expression> parsePrimaryExpression();
std::vector<ASTPointer<Expression>> parseFunctionCallListArguments();
std::pair<std::vector<ASTPointer<Expression>>, std::vector<ASTPointer<ASTString>>> parseFunctionCallArguments();
///@}
///@{
///@name Helper functions
/// Used as return value of @see peekStatementType.
enum class LookAheadInfo
{
IndexAccessStructure, VariableDeclarationStatement, ExpressionStatement
};
/// Performs limited look-ahead to distinguish between variable declaration and expression statement.
/// For source code of the form "a[][8]" ("IndexAccessStructure"), this is not possible to
/// decide with constant look-ahead.
LookAheadInfo peekStatementType() const;
/// Returns a typename parsed in look-ahead fashion from something like "a[8][2**70]".
ASTPointer<TypeName> typeNameIndexAccessStructure(
ASTPointer<PrimaryExpression> const& _primary,
std::vector<std::pair<ASTPointer<Expression>, SourceLocation>> const& _indices);
/// Returns an expression parsed in look-ahead fashion from something like "a[8][2**70]".
ASTPointer<Expression> expressionFromIndexAccessStructure(
ASTPointer<PrimaryExpression> const& _primary,
std::vector<std::pair<ASTPointer<Expression>, SourceLocation>> const& _indices);
/// If current token value is not _value, throw exception otherwise advance token.
void expectToken(Token::Value _value);
Token::Value expectAssignmentOperator();
ASTPointer<ASTString> expectIdentifierToken();
ASTPointer<ASTString> getLiteralAndAdvance();
///@}
/// Creates an empty ParameterList at the current location (used if parameters can be omitted).
ASTPointer<ParameterList> createEmptyParameterList();
/// Creates a @ref ParserError exception and annotates it with the current position and the
/// given @a _description.
ParserError createParserError(std::string const& _description) const;
std::shared_ptr<Scanner> m_scanner;
/// Flag that signifies whether '_' is parsed as a PlaceholderStatement or a regular identifier.
bool m_insideModifier = false;
};
}
}
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