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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.
*/
#include "libsolidity/BaseTypes.h"
#include "libsolidity/Parser.h"
#include "libsolidity/Scanner.h"
namespace dev {
namespace solidity {
ptr<ASTNode> Parser::parse(Scanner& _scanner)
{
m_scanner = &_scanner;
return parseContractDefinition();
}
/// AST node factory that also tracks the begin and end position of an AST node
/// while it is being parsed
class Parser::ASTNodeFactory
{
public:
ASTNodeFactory(const Parser& _parser)
: m_parser(_parser),
m_location(_parser.getPosition(), -1)
{}
void markEndPosition()
{
m_location.end_pos = m_parser.getEndPosition();
}
/// @todo: check that this actually uses perfect forwarding
template <class NodeType, typename... Args>
ptr<NodeType> createNode(Args&&... _args)
{
if (m_location.end_pos < 0) markEndPosition();
return std::make_shared<NodeType>(m_location, std::forward<Args>(_args)...);
}
private:
const Parser& m_parser;
Location m_location;
};
int Parser::getPosition() const
{
return m_scanner->getCurrentLocation().beg_pos;
}
int Parser::getEndPosition() const
{
return m_scanner->getCurrentLocation().end_pos;
}
ptr<ContractDefinition> Parser::parseContractDefinition()
{
ASTNodeFactory nodeFactory(*this);
expectToken(Token::CONTRACT);
std::string name = expectIdentifier();
expectToken(Token::LBRACE);
vecptr<StructDefinition> structs;
vecptr<VariableDeclaration> stateVariables;
vecptr<FunctionDefinition> functions;
bool visibilityIsPublic = true;
while (true) {
Token::Value currentToken = m_scanner->getCurrentToken();
if (currentToken == Token::RBRACE) {
break;
} else if (currentToken == Token::PUBLIC || currentToken == Token::PRIVATE) {
visibilityIsPublic = (m_scanner->getCurrentToken() == Token::PUBLIC);
m_scanner->next();
expectToken(Token::COLON);
} else if (currentToken == Token::FUNCTION) {
functions.push_back(parseFunctionDefinition(visibilityIsPublic));
} else if (currentToken == Token::STRUCT) {
structs.push_back(parseStructDefinition());
expectToken(Token::SEMICOLON);
} else if (currentToken == Token::IDENTIFIER || currentToken == Token::MAPPING ||
Token::IsElementaryTypeName(currentToken)) {
stateVariables.push_back(parseVariableDeclaration());
expectToken(Token::SEMICOLON);
} else {
throwExpectationError("Function, variable or struct declaration expected.");
}
}
nodeFactory.markEndPosition();
m_scanner->next();
expectToken(Token::EOS);
return nodeFactory.createNode<ContractDefinition>(name, structs, stateVariables, functions);
}
ptr<FunctionDefinition> Parser::parseFunctionDefinition(bool _isPublic)
{
(void) _isPublic;
throwExpectationError("Function parsing is not yet implemented.");
}
ptr<StructDefinition> Parser::parseStructDefinition()
{
throwExpectationError("Struct definition parsing is not yet implemented.");
}
ptr<VariableDeclaration> Parser::parseVariableDeclaration()
{
ASTNodeFactory nodeFactory(*this);
ptr<TypeName> type;
Token::Value token = m_scanner->getCurrentToken();
if (Token::IsElementaryTypeName(token)) {
type = ASTNodeFactory(*this).createNode<ElementaryTypeName>(token);
m_scanner->next();
} else if (token == Token::VAR) {
type = ASTNodeFactory(*this).createNode<TypeName>();
m_scanner->next();
} else if (token == Token::MAPPING) {
// TODO
throwExpectationError("mappings are not yet implemented");
} else if (token == Token::IDENTIFIER) {
type = ASTNodeFactory(*this).createNode<UserDefinedTypeName>(m_scanner->getCurrentLiteral());
m_scanner->next();
} else {
throwExpectationError("Expected variable declaration");
}
nodeFactory.markEndPosition();
std::string name = expectIdentifier();
return nodeFactory.createNode<VariableDeclaration>(type, name);
}
void Parser::expectToken(Token::Value _value)
{
if (m_scanner->getCurrentToken() != _value)
throwExpectationError(std::string("Expected token ") + std::string(Token::Name(_value)));
m_scanner->next();
}
std::string Parser::expectIdentifier()
{
if (m_scanner->getCurrentToken() != Token::IDENTIFIER)
throwExpectationError("Expected identifier");
std::string literal = m_scanner->getCurrentLiteral();
m_scanner->next();
return literal;
}
void Parser::throwExpectationError(const std::string& _description)
{
(void) _description;
/// @todo make a proper exception hierarchy
throw std::exception();//_description);
}
} }
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