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authorchriseth <c@ethdev.com>2015-10-21 06:21:52 +0800
committerchriseth <c@ethdev.com>2015-10-21 06:46:01 +0800
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parentd41f8b7ce702c3b25c48d27e2e895ccdcd04e4e0 (diff)
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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/AST.h"
+
+namespace dev
+{
+namespace solidity
+{
+
+class Scanner;
+
+class Parser
+{
+public:
+ Parser(ErrorList& errors): m_errors(errors){};
+
+ ASTPointer<SourceUnit> parse(std::shared_ptr<Scanner> const& _scanner);
+ std::shared_ptr<std::string const> const& sourceName() const;
+
+private:
+ class ASTNodeFactory;
+
+ /// Start position of the current token
+ int position() const;
+ /// End position of the current token
+ int endPosition() const;
+
+ struct VarDeclParserOptions
+ {
+ VarDeclParserOptions() {}
+ bool allowVar = false;
+ bool isStateVariable = false;
+ bool allowIndexed = false;
+ bool allowEmptyName = false;
+ bool allowInitialValue = false;
+ bool allowLocationSpecifier = false;
+ };
+
+ ///@{
+ ///@name Parsing functions for the AST nodes
+ ASTPointer<ImportDirective> parseImportDirective();
+ ASTPointer<ContractDefinition> parseContractDefinition(bool _isLibrary);
+ 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(
+ VarDeclParserOptions const& _options,
+ bool _allowEmpty = true
+ );
+ 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.b[8][2**70]".
+ ASTPointer<TypeName> typeNameIndexAccessStructure(
+ std::vector<ASTPointer<PrimaryExpression>> const& _path,
+ std::vector<std::pair<ASTPointer<Expression>, SourceLocation>> const& _indices
+ );
+ /// Returns an expression parsed in look-ahead fashion from something like "a.b[8][2**70]".
+ ASTPointer<Expression> expressionFromIndexAccessStructure(
+ std::vector<ASTPointer<PrimaryExpression>> const& _path,
+ 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 and annotates it with the current position and the
+ /// given @a _description.
+ void parserError(std::string const& _description);
+
+ /// Creates a @ref ParserError and annotates it with the current position and the
+ /// given @a _description. Throws the FatalError.
+ void fatalParserError(std::string const& _description);
+
+ std::shared_ptr<Scanner> m_scanner;
+ /// Flag that signifies whether '_' is parsed as a PlaceholderStatement or a regular identifier.
+ bool m_insideModifier = false;
+ /// The reference to the list of errors and warning to add errors/warnings during parsing
+ ErrorList& m_errors;
+};
+
+}
+}