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Parser.cpp
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/*
This file is part of solidity.
solidity 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.
solidity 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 solidity. If not, see <http://www.gnu.org/licenses/>.
*/
// SPDX-License-Identifier: GPL-3.0
/**
* @author Christian <[email protected]>
* @date 2014
* Solidity parser.
*/
#include <libsolidity/parsing/Parser.h>
#include <libsolidity/ast/UserDefinableOperators.h>
#include <libsolidity/interface/Version.h>
#include <libyul/AST.h>
#include <libyul/AsmParser.h>
#include <libyul/backends/evm/EVMDialect.h>
#include <liblangutil/ErrorReporter.h>
#include <liblangutil/Scanner.h>
#include <liblangutil/SemVerHandler.h>
#include <liblangutil/SourceLocation.h>
#include <libyul/backends/evm/EVMDialect.h>
#include <boost/algorithm/string/trim.hpp>
#include <boost/algorithm/string/replace.hpp>
#include <boost/algorithm/string/predicate.hpp>
#include <cctype>
#include <memory>
#include <regex>
#include <tuple>
#include <vector>
using namespace solidity::langutil;
using namespace std::string_literals;
namespace solidity::frontend
{
/// AST node factory that also tracks the begin and end position of an AST node
/// while it is being parsed
class Parser::ASTNodeFactory
{
public:
explicit ASTNodeFactory(Parser& _parser):
m_parser(_parser), m_location{
_parser.currentLocation().start,
-1,
_parser.currentLocation().sourceName
}
{}
ASTNodeFactory(Parser& _parser, ASTPointer<ASTNode> const& _childNode):
m_parser(_parser), m_location{_childNode->location()} {}
void markEndPosition() { m_location.end = m_parser.currentLocation().end; }
void setLocation(SourceLocation const& _location) { m_location = _location; }
void setLocationEmpty() { m_location.end = m_location.start; }
/// Set the end position to the one of the given node.
void setEndPositionFromNode(ASTPointer<ASTNode> const& _node) { m_location.end = _node->location().end; }
template <class NodeType, typename... Args>
ASTPointer<NodeType> createNode(Args&& ... _args)
{
solAssert(m_location.sourceName, "");
if (m_location.end < 0)
markEndPosition();
return std::make_shared<NodeType>(m_parser.nextID(), m_location, std::forward<Args>(_args)...);
}
SourceLocation const& location() const noexcept { return m_location; }
private:
Parser& m_parser;
SourceLocation m_location;
};
ASTPointer<SourceUnit> Parser::parse(CharStream& _charStream)
{
solAssert(!m_insideModifier, "");
try
{
m_recursionDepth = 0;
m_scanner = std::make_shared<Scanner>(_charStream);
ASTNodeFactory nodeFactory(*this);
m_experimentalSolidityEnabledInCurrentSourceUnit = false;
std::vector<ASTPointer<ASTNode>> nodes;
while (m_scanner->currentToken() == Token::Pragma)
nodes.push_back(parsePragmaDirective(false));
if (m_experimentalSolidityEnabledInCurrentSourceUnit)
m_scanner->setScannerMode(ScannerKind::ExperimentalSolidity);
while (m_scanner->currentToken() != Token::EOS)
{
switch (m_scanner->currentToken())
{
case Token::Pragma:
nodes.push_back(parsePragmaDirective(true));
break;
case Token::Import:
nodes.push_back(parseImportDirective());
break;
case Token::Abstract:
case Token::Interface:
case Token::Contract:
case Token::Library:
nodes.push_back(parseContractDefinition());
break;
case Token::Struct:
nodes.push_back(parseStructDefinition());
break;
case Token::Enum:
nodes.push_back(parseEnumDefinition());
break;
case Token::Type:
if (m_experimentalSolidityEnabledInCurrentSourceUnit)
nodes.push_back(parseTypeDefinition());
else
nodes.push_back(parseUserDefinedValueTypeDefinition());
break;
case Token::Using:
nodes.push_back(parseUsingDirective());
break;
case Token::Function:
nodes.push_back(parseFunctionDefinition(true));
break;
case Token::ForAll:
nodes.push_back(parseQuantifiedFunctionDefinition());
break;
case Token::Event:
nodes.push_back(parseEventDefinition());
break;
case Token::Class:
solAssert(m_experimentalSolidityEnabledInCurrentSourceUnit);
nodes.push_back(parseTypeClassDefinition());
break;
case Token::Instantiation:
solAssert(m_experimentalSolidityEnabledInCurrentSourceUnit);
nodes.push_back(parseTypeClassInstantiation());
break;
default:
if (
// Workaround because `error` is not a keyword.
m_scanner->currentToken() == Token::Identifier &&
currentLiteral() == "error" &&
m_scanner->peekNextToken() == Token::Identifier &&
m_scanner->peekNextNextToken() == Token::LParen
)
nodes.push_back(parseErrorDefinition());
// Constant variable.
else if (variableDeclarationStart() && m_scanner->peekNextToken() != Token::EOS)
{
VarDeclParserOptions options;
options.kind = VarDeclKind::FileLevel;
options.allowInitialValue = true;
nodes.push_back(parseVariableDeclaration(options));
expectToken(Token::Semicolon);
}
else
fatalParserError(7858_error, "Expected pragma, import directive or contract/interface/library/struct/enum/constant/function/error definition.");
}
}
solAssert(m_recursionDepth == 0, "");
return nodeFactory.createNode<SourceUnit>(findLicenseString(nodes), nodes, m_experimentalSolidityEnabledInCurrentSourceUnit);
}
catch (FatalError const&)
{
if (!m_errorReporter.hasErrors())
{
std::cerr << "Unreported fatal error:" << std::endl;
std::cerr << boost::current_exception_diagnostic_information() << std::endl;
solAssert(false, "Unreported fatal error.");
}
return nullptr;
}
}
void Parser::parsePragmaVersion(SourceLocation const& _location, std::vector<Token> const& _tokens, std::vector<std::string> const& _literals)
{
SemVerMatchExpressionParser parser(_tokens, _literals);
try
{
SemVerMatchExpression matchExpression = parser.parse();
static SemVerVersion const currentVersion{std::string(VersionString)};
// FIXME: only match for major version incompatibility
if (!matchExpression.matches(currentVersion))
m_errorReporter.fatalParserError(
5333_error,
_location,
"Source file requires different compiler version (current compiler is " +
std::string(VersionString) + ") - note that nightly builds are considered to be "
"strictly less than the released version"
);
}
catch (SemVerError const& matchError)
{
m_errorReporter.fatalParserError(
1684_error,
_location,
"Invalid version pragma. "s + matchError.what()
);
}
}
ASTPointer<StructuredDocumentation> Parser::parseStructuredDocumentation()
{
if (m_scanner->currentCommentLiteral() != "")
{
ASTNodeFactory nodeFactory{*this};
nodeFactory.setLocation(m_scanner->currentCommentLocation());
return nodeFactory.createNode<StructuredDocumentation>(
std::make_shared<ASTString>(m_scanner->currentCommentLiteral())
);
}
return nullptr;
}
ASTPointer<PragmaDirective> Parser::parsePragmaDirective(bool const _finishedParsingTopLevelPragmas)
{
RecursionGuard recursionGuard(*this);
// pragma anything* ;
// Currently supported:
// pragma solidity ^0.4.0 || ^0.3.0;
ASTNodeFactory nodeFactory(*this);
expectToken(Token::Pragma);
std::vector<std::string> literals;
std::vector<Token> tokens;
do
{
Token token = m_scanner->currentToken();
if (token == Token::Illegal)
parserError(6281_error, "Token incompatible with Solidity parser as part of pragma directive.");
else
{
std::string literal = m_scanner->currentLiteral();
if (literal.empty() && TokenTraits::toString(token))
literal = TokenTraits::toString(token);
literals.push_back(literal);
tokens.push_back(token);
}
advance();
}
while (m_scanner->currentToken() != Token::Semicolon && m_scanner->currentToken() != Token::EOS);
nodeFactory.markEndPosition();
expectToken(Token::Semicolon);
if (literals.size() >= 1 && literals[0] == "solidity")
{
parsePragmaVersion(
nodeFactory.location(),
std::vector<Token>(tokens.begin() + 1, tokens.end()),
std::vector<std::string>(literals.begin() + 1, literals.end())
);
}
if (literals.size() >= 2 && literals[0] == "experimental" && literals[1] == "solidity")
{
if (m_evmVersion < EVMVersion::constantinople())
fatalParserError(7637_error, "Experimental solidity requires Constantinople EVM version at the minimum.");
if (_finishedParsingTopLevelPragmas)
fatalParserError(8185_error, "Experimental pragma \"solidity\" can only be set at the beginning of the source unit.");
m_experimentalSolidityEnabledInCurrentSourceUnit = true;
}
return nodeFactory.createNode<PragmaDirective>(tokens, literals);
}
ASTPointer<ImportDirective> Parser::parseImportDirective()
{
RecursionGuard recursionGuard(*this);
// import "abc" [as x];
// import * as x from "abc";
// import {a as b, c} from "abc";
ASTNodeFactory nodeFactory(*this);
expectToken(Token::Import);
ASTPointer<ASTString> path;
ASTPointer<ASTString> unitAlias = std::make_shared<std::string>();
SourceLocation unitAliasLocation{};
ImportDirective::SymbolAliasList symbolAliases;
if (isQuotedPath() || isStdlibPath())
{
path = isQuotedPath() ? getLiteralAndAdvance() : getStdlibImportPathAndAdvance();
if (m_scanner->currentToken() == Token::As)
{
advance();
tie(unitAlias, unitAliasLocation) = expectIdentifierWithLocation();
}
}
else
{
if (m_scanner->currentToken() == Token::LBrace)
{
advance();
while (true)
{
ASTPointer<ASTString> alias;
SourceLocation aliasLocation = currentLocation();
ASTPointer<Identifier> id = parseIdentifier();
if (m_scanner->currentToken() == Token::As)
{
expectToken(Token::As);
tie(alias, aliasLocation) = expectIdentifierWithLocation();
}
symbolAliases.emplace_back(ImportDirective::SymbolAlias{std::move(id), std::move(alias), aliasLocation});
if (m_scanner->currentToken() != Token::Comma)
break;
advance();
}
expectToken(Token::RBrace);
}
else if (m_scanner->currentToken() == Token::Mul)
{
advance();
expectToken(Token::As);
tie(unitAlias, unitAliasLocation) = expectIdentifierWithLocation();
}
else
fatalParserError(9478_error, "Expected string literal (path), \"*\" or alias list.");
// "from" is not a keyword but parsed as an identifier because of backwards
// compatibility and because it is a really common word.
if (m_scanner->currentToken() != Token::Identifier || m_scanner->currentLiteral() != "from")
fatalParserError(8208_error, "Expected \"from\".");
advance();
if (!isQuotedPath() && !isStdlibPath())
fatalParserError(6845_error, "Expected import path.");
path = isQuotedPath() ? getLiteralAndAdvance() : getStdlibImportPathAndAdvance();
}
if (path->empty())
fatalParserError(6326_error, "Import path cannot be empty.");
nodeFactory.markEndPosition();
expectToken(Token::Semicolon);
return nodeFactory.createNode<ImportDirective>(path, unitAlias, unitAliasLocation, std::move(symbolAliases));
}
std::pair<ContractKind, bool> Parser::parseContractKind()
{
ContractKind kind;
bool abstract = false;
if (m_scanner->currentToken() == Token::Abstract)
{
abstract = true;
advance();
}
switch (m_scanner->currentToken())
{
case Token::Interface:
kind = ContractKind::Interface;
break;
case Token::Contract:
kind = ContractKind::Contract;
break;
case Token::Library:
kind = ContractKind::Library;
break;
default:
parserError(3515_error, "Expected keyword \"contract\", \"interface\" or \"library\".");
return std::make_pair(ContractKind::Contract, abstract);
}
advance();
return std::make_pair(kind, abstract);
}
ASTPointer<StorageLayoutSpecifier> Parser::parseStorageLayoutSpecifier()
{
RecursionGuard recursionGuard(*this);
ASTNodeFactory nodeFactory(*this);
ASTPointer<ASTString> layoutIdentifier = expectIdentifierToken();
solAssert(layoutIdentifier && *layoutIdentifier == "layout");
if (
m_scanner->currentToken() != Token::Identifier ||
m_scanner->currentLiteral() != "at"
)
m_errorReporter.parserError(
1994_error,
m_scanner->currentLocation(),
"Expected \'at\' but got " + tokenName(m_scanner->currentToken())
);
advance();
ASTPointer<Expression> baseSlotExpression = parseExpression();
solAssert(baseSlotExpression);
nodeFactory.setEndPositionFromNode(baseSlotExpression);
return nodeFactory.createNode<StorageLayoutSpecifier>(
baseSlotExpression
);
}
ASTPointer<ContractDefinition> Parser::parseContractDefinition()
{
RecursionGuard recursionGuard(*this);
ASTNodeFactory nodeFactory(*this);
ASTPointer<ASTString> name = nullptr;
SourceLocation nameLocation{};
ASTPointer<StructuredDocumentation> documentation;
std::vector<ASTPointer<InheritanceSpecifier>> baseContracts;
std::vector<ASTPointer<ASTNode>> subNodes;
std::pair<ContractKind, bool> contractKind{};
ASTPointer<StorageLayoutSpecifier> storageLayoutSpecifier;
documentation = parseStructuredDocumentation();
contractKind = parseContractKind();
std::tie(name, nameLocation) = expectIdentifierWithLocation();
while (true)
{
if (m_scanner->currentToken() == Token::Is)
{
if (baseContracts.size() != 0)
m_errorReporter.parserError(
6668_error,
m_scanner->currentLocation(),
SecondarySourceLocation().append("Previous list:", baseContracts[0]->location()),
"More than one inheritance list."
);
do
{
advance();
baseContracts.push_back(parseInheritanceSpecifier());
}
while (m_scanner->currentToken() == Token::Comma);
}
else if (
m_scanner->currentToken() == Token::Identifier &&
m_scanner->currentLiteral() == "layout" &&
contractKind.first == ContractKind::Contract
)
{
if (storageLayoutSpecifier)
m_errorReporter.parserError(
8714_error,
m_scanner->currentLocation(),
SecondarySourceLocation().append("Previous definition:", storageLayoutSpecifier->location()),
"More than one storage layout definition."
);
storageLayoutSpecifier = parseStorageLayoutSpecifier();
}
else
break;
}
if (storageLayoutSpecifier && baseContracts.size() > 0)
{
solAssert(!storageLayoutSpecifier->location().intersects(baseContracts[0]->location()));
solAssert(!baseContracts[0]->location().intersects(storageLayoutSpecifier->location()));
}
expectToken(Token::LBrace);
while (true)
{
Token currentTokenValue = m_scanner->currentToken();
if (currentTokenValue == Token::RBrace)
break;
else if (
(currentTokenValue == Token::Function && m_scanner->peekNextToken() != Token::LParen) ||
currentTokenValue == Token::Constructor ||
currentTokenValue == Token::Receive ||
currentTokenValue == Token::Fallback
)
subNodes.push_back(parseFunctionDefinition());
else if (currentTokenValue == Token::Struct)
subNodes.push_back(parseStructDefinition());
else if (currentTokenValue == Token::Enum)
subNodes.push_back(parseEnumDefinition());
else if (currentTokenValue == Token::Type)
subNodes.push_back(parseUserDefinedValueTypeDefinition());
else if (
// Workaround because `error` is not a keyword.
currentTokenValue == Token::Identifier &&
currentLiteral() == "error" &&
m_scanner->peekNextToken() == Token::Identifier &&
m_scanner->peekNextNextToken() == Token::LParen
)
subNodes.push_back(parseErrorDefinition());
else if (variableDeclarationStart())
{
VarDeclParserOptions options;
options.kind = VarDeclKind::State;
options.allowInitialValue = true;
subNodes.push_back(parseVariableDeclaration(options));
expectToken(Token::Semicolon);
}
else if (currentTokenValue == Token::Modifier)
subNodes.push_back(parseModifierDefinition());
else if (currentTokenValue == Token::Event)
subNodes.push_back(parseEventDefinition());
else if (currentTokenValue == Token::Using)
subNodes.push_back(parseUsingDirective());
else
fatalParserError(9182_error, "Function, variable, struct or modifier declaration expected.");
}
nodeFactory.markEndPosition();
expectToken(Token::RBrace);
return nodeFactory.createNode<ContractDefinition>(
name,
nameLocation,
documentation,
baseContracts,
subNodes,
contractKind.first,
contractKind.second,
storageLayoutSpecifier
);
}
ASTPointer<InheritanceSpecifier> Parser::parseInheritanceSpecifier()
{
RecursionGuard recursionGuard(*this);
ASTNodeFactory nodeFactory(*this);
ASTPointer<IdentifierPath> name(parseIdentifierPath());
std::unique_ptr<std::vector<ASTPointer<Expression>>> arguments;
if (m_scanner->currentToken() == Token::LParen)
{
advance();
arguments = std::make_unique<std::vector<ASTPointer<Expression>>>(parseFunctionCallListArguments());
nodeFactory.markEndPosition();
expectToken(Token::RParen);
}
else
nodeFactory.setEndPositionFromNode(name);
return nodeFactory.createNode<InheritanceSpecifier>(name, std::move(arguments));
}
Visibility Parser::parseVisibilitySpecifier()
{
Visibility visibility(Visibility::Default);
Token token = m_scanner->currentToken();
switch (token)
{
case Token::Public:
visibility = Visibility::Public;
break;
case Token::Internal:
visibility = Visibility::Internal;
break;
case Token::Private:
visibility = Visibility::Private;
break;
case Token::External:
visibility = Visibility::External;
break;
default:
solAssert(false, "Invalid visibility specifier.");
}
advance();
return visibility;
}
ASTPointer<OverrideSpecifier> Parser::parseOverrideSpecifier()
{
solAssert(m_scanner->currentToken() == Token::Override, "");
ASTNodeFactory nodeFactory(*this);
std::vector<ASTPointer<IdentifierPath>> overrides;
nodeFactory.markEndPosition();
advance();
if (m_scanner->currentToken() == Token::LParen)
{
advance();
while (true)
{
overrides.push_back(parseIdentifierPath());
if (m_scanner->currentToken() == Token::RParen)
break;
expectToken(Token::Comma);
}
nodeFactory.markEndPosition();
expectToken(Token::RParen);
}
return nodeFactory.createNode<OverrideSpecifier>(std::move(overrides));
}
StateMutability Parser::parseStateMutability()
{
StateMutability stateMutability(StateMutability::NonPayable);
Token token = m_scanner->currentToken();
switch (token)
{
case Token::Payable:
stateMutability = StateMutability::Payable;
break;
case Token::View:
stateMutability = StateMutability::View;
break;
case Token::Pure:
stateMutability = StateMutability::Pure;
break;
default:
solAssert(false, "Invalid state mutability specifier.");
}
advance();
return stateMutability;
}
Parser::FunctionHeaderParserResult Parser::parseFunctionHeader(bool _isStateVariable)
{
RecursionGuard recursionGuard(*this);
FunctionHeaderParserResult result;
VarDeclParserOptions options;
options.allowLocationSpecifier = true;
result.parameters = parseParameterList(options);
while (true)
{
Token token = m_scanner->currentToken();
if (!_isStateVariable && token == Token::Identifier)
result.modifiers.push_back(parseModifierInvocation());
else if (TokenTraits::isVisibilitySpecifier(token))
{
if (result.visibility != Visibility::Default)
{
// There is the special case of a public state variable of function type.
// Detect this and return early.
if (_isStateVariable && (result.visibility == Visibility::External || result.visibility == Visibility::Internal))
break;
parserError(
9439_error,
"Visibility already specified as \"" +
Declaration::visibilityToString(result.visibility) +
"\"."
);
advance();
}
else
result.visibility = parseVisibilitySpecifier();
}
else if (TokenTraits::isStateMutabilitySpecifier(token))
{
if (result.stateMutability != StateMutability::NonPayable)
{
parserError(
9680_error,
"State mutability already specified as \"" +
stateMutabilityToString(result.stateMutability) +
"\"."
);
advance();
}
else
result.stateMutability = parseStateMutability();
}
else if (!_isStateVariable && token == Token::Override)
{
if (result.overrides)
parserError(1827_error, "Override already specified.");
result.overrides = parseOverrideSpecifier();
}
else if (!_isStateVariable && token == Token::Virtual)
{
if (result.isVirtual)
parserError(6879_error, "Virtual already specified.");
result.isVirtual = true;
advance();
}
else
break;
}
if (m_experimentalSolidityEnabledInCurrentSourceUnit)
{
if (m_scanner->currentToken() == Token::RightArrow)
{
advance();
result.experimentalReturnExpression = parseBinaryExpression();
}
}
else
{
if (m_scanner->currentToken() == Token::Returns)
{
bool const permitEmptyParameterList = m_experimentalSolidityEnabledInCurrentSourceUnit;
advance();
result.returnParameters = parseParameterList(options, permitEmptyParameterList);
}
else
result.returnParameters = createEmptyParameterList();
}
return result;
}
ASTPointer<ForAllQuantifier> Parser::parseQuantifiedFunctionDefinition()
{
solAssert(m_experimentalSolidityEnabledInCurrentSourceUnit);
RecursionGuard recursionGuard(*this);
ASTNodeFactory nodeFactory(*this);
expectToken(Token::ForAll);
ASTPointer<ParameterList> typeVariableDeclarations = parseParameterList();
nodeFactory.markEndPosition();
if (m_scanner->currentToken() != Token::Function)
fatalParserError(5709_error, "Expected a function definition.");
ASTPointer<FunctionDefinition> quantifiedFunction = parseFunctionDefinition(true /* _freeFunction */, true /* _allowBody */);
return nodeFactory.createNode<ForAllQuantifier>(
std::move(typeVariableDeclarations),
std::move(quantifiedFunction)
);
}
ASTPointer<FunctionDefinition> Parser::parseFunctionDefinition(bool _freeFunction, bool _allowBody)
{
RecursionGuard recursionGuard(*this);
ASTNodeFactory nodeFactory(*this);
ASTPointer<StructuredDocumentation> documentation = parseStructuredDocumentation();
Token kind = m_scanner->currentToken();
ASTPointer<ASTString> name;
SourceLocation nameLocation;
if (kind == Token::Function)
{
advance();
if (
m_scanner->currentToken() == Token::Constructor ||
m_scanner->currentToken() == Token::Fallback ||
m_scanner->currentToken() == Token::Receive
)
{
std::string expected = std::map<Token, std::string>{
{Token::Constructor, "constructor"},
{Token::Fallback, "fallback function"},
{Token::Receive, "receive function"},
}.at(m_scanner->currentToken());
nameLocation = currentLocation();
name = std::make_shared<ASTString>(TokenTraits::toString(m_scanner->currentToken()));
std::string message{
"This function is named \"" + *name + "\" but is not the " + expected + " of the contract. "
"If you intend this to be a " + expected + ", use \"" + *name + "(...) { ... }\" without "
"the \"function\" keyword to define it."
};
if (m_scanner->currentToken() == Token::Constructor)
parserError(3323_error, message);
else
parserWarning(3445_error, message);
advance();
}
else
tie(name, nameLocation) = expectIdentifierWithLocation();
}
else
{
solAssert(kind == Token::Constructor || kind == Token::Fallback || kind == Token::Receive, "");
advance();
name = std::make_shared<ASTString>();
}
FunctionHeaderParserResult header = parseFunctionHeader(false);
if (m_experimentalSolidityEnabledInCurrentSourceUnit)
solAssert(!header.returnParameters);
else
solAssert(!header.experimentalReturnExpression);
ASTPointer<Block> block;
nodeFactory.markEndPosition();
if (!_allowBody)
expectToken(Token::Semicolon);
else if (m_scanner->currentToken() == Token::Semicolon)
advance();
else
{
block = parseBlock();
nodeFactory.setEndPositionFromNode(block);
}
return nodeFactory.createNode<FunctionDefinition>(
name,
nameLocation,
header.visibility,
header.stateMutability,
_freeFunction,
kind,
header.isVirtual,
header.overrides,
documentation,
header.parameters,
header.modifiers,
header.returnParameters,
block,
header.experimentalReturnExpression
);
}
ASTPointer<StructDefinition> Parser::parseStructDefinition()
{
RecursionGuard recursionGuard(*this);
ASTNodeFactory nodeFactory(*this);
ASTPointer<StructuredDocumentation> documentation = parseStructuredDocumentation();
expectToken(Token::Struct);
auto [name, nameLocation] = expectIdentifierWithLocation();
std::vector<ASTPointer<VariableDeclaration>> members;
expectToken(Token::LBrace);
while (m_scanner->currentToken() != Token::RBrace)
{
members.push_back(parseVariableDeclaration());
expectToken(Token::Semicolon);
}
nodeFactory.markEndPosition();
expectToken(Token::RBrace);
return nodeFactory.createNode<StructDefinition>(std::move(name), std::move(nameLocation), std::move(members), std::move(documentation));
}
ASTPointer<EnumValue> Parser::parseEnumValue()
{
RecursionGuard recursionGuard(*this);
ASTNodeFactory nodeFactory(*this);
ASTPointer<StructuredDocumentation> documentation = parseStructuredDocumentation();
nodeFactory.markEndPosition();
return nodeFactory.createNode<EnumValue>(expectIdentifierToken(), documentation);
}
ASTPointer<EnumDefinition> Parser::parseEnumDefinition()
{
RecursionGuard recursionGuard(*this);
ASTNodeFactory nodeFactory(*this);
ASTPointer<StructuredDocumentation> documentation = parseStructuredDocumentation();
expectToken(Token::Enum);
auto [name, nameLocation] = expectIdentifierWithLocation();
std::vector<ASTPointer<EnumValue>> members;
expectToken(Token::LBrace);
while (m_scanner->currentToken() != Token::RBrace)
{
members.push_back(parseEnumValue());
if (m_scanner->currentToken() == Token::RBrace)
break;
expectToken(Token::Comma);
if (m_scanner->currentToken() != Token::Identifier)
fatalParserError(1612_error, "Expected identifier after ','");
}
if (members.empty())
parserError(3147_error, "Enum with no members is not allowed.");
nodeFactory.markEndPosition();
expectToken(Token::RBrace);
return nodeFactory.createNode<EnumDefinition>(name, nameLocation, members, documentation);
}
ASTPointer<VariableDeclaration> Parser::parseVariableDeclaration(
VarDeclParserOptions const& _options,
ASTPointer<TypeName> const& _lookAheadArrayType
)
{
RecursionGuard recursionGuard(*this);
ASTNodeFactory nodeFactory = _lookAheadArrayType ?
ASTNodeFactory(*this, _lookAheadArrayType) : ASTNodeFactory(*this);
ASTPointer<StructuredDocumentation> const documentation = parseStructuredDocumentation();
ASTPointer<TypeName> type = _lookAheadArrayType ? _lookAheadArrayType : parseTypeName();
nodeFactory.setEndPositionFromNode(type);
if (dynamic_cast<FunctionTypeName*>(type.get()) && _options.kind == VarDeclKind::State && m_scanner->currentToken() == Token::LBrace)
fatalParserError(
2915_error,
"Expected a state variable declaration. If you intended this as a fallback function "
"or a function to handle plain ether transactions, use the \"fallback\" keyword "
"or the \"receive\" keyword instead."
);
bool isIndexed = false;
VariableDeclaration::Mutability mutability = VariableDeclaration::Mutability::Mutable;
ASTPointer<OverrideSpecifier> overrides = nullptr;
Visibility visibility(Visibility::Default);
VariableDeclaration::Location location = VariableDeclaration::Location::Unspecified;
ASTPointer<ASTString> identifier;
SourceLocation nameLocation{};
while (true)
{
Token token = m_scanner->currentToken();
if (_options.kind == VarDeclKind::State && TokenTraits::isVariableVisibilitySpecifier(token))
{
nodeFactory.markEndPosition();
if (visibility != Visibility::Default)
{
parserError(
4110_error,
"Visibility already specified as \"" +
Declaration::visibilityToString(visibility) +
"\"."
);
advance();
}
else
visibility = parseVisibilitySpecifier();
}
else if (_options.kind == VarDeclKind::State && token == Token::Override)
{
if (overrides)
parserError(9125_error, "Override already specified.");
overrides = parseOverrideSpecifier();
}
else
{
if (_options.allowIndexed && token == Token::Indexed)
{
if (isIndexed)
parserError(5399_error, "Indexed already specified.");
isIndexed = true;
}
else if (token == Token::Constant || token == Token::Immutable)
{
if (mutability != VariableDeclaration::Mutability::Mutable)
parserError(
3109_error,
std::string("Mutability already set to ") +
(mutability == VariableDeclaration::Mutability::Constant ? "\"constant\"" : "\"immutable\"")
);
else if (token == Token::Constant)
mutability = VariableDeclaration::Mutability::Constant;
else if (token == Token::Immutable)
mutability = VariableDeclaration::Mutability::Immutable;
}
else if (_options.allowLocationSpecifier && TokenTraits::isLocationSpecifier(token))
{
if (location != VariableDeclaration::Location::Unspecified)
parserError(3548_error, "Location already specified.");
else
{
switch (token)
{
case Token::Storage:
location = VariableDeclaration::Location::Storage;
break;
case Token::Memory:
location = VariableDeclaration::Location::Memory;
break;
case Token::CallData:
location = VariableDeclaration::Location::CallData;
break;
default:
solAssert(false, "Unknown data location.");
}
}
}
else if (
_options.kind == VarDeclKind::State &&
token == Token::Identifier &&
m_scanner->currentLiteral() == "transient" &&
m_scanner->peekNextToken() != Token::Assign &&
m_scanner->peekNextToken() != Token::Semicolon
)
{
if (location != VariableDeclaration::Location::Unspecified)
parserError(ErrorId{3548}, "Location already specified.");
else
location = VariableDeclaration::Location::Transient;
}
else
break;
nodeFactory.markEndPosition();
advance();
}
}
if (_options.allowEmptyName && m_scanner->currentToken() != Token::Identifier)
identifier = std::make_shared<ASTString>("");
else
{
nodeFactory.markEndPosition();
tie(identifier, nameLocation) = expectIdentifierWithLocation();
}
ASTPointer<Expression> value;
if (_options.allowInitialValue)
{
if (m_scanner->currentToken() == Token::Assign)
{
advance();
value = parseExpression();
nodeFactory.setEndPositionFromNode(value);
}
}
return nodeFactory.createNode<VariableDeclaration>(
type,
identifier,
nameLocation,
value,
visibility,