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https://github.com/ClickHouse/ClickHouse.git
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175 lines
3.6 KiB
C++
175 lines
3.6 KiB
C++
//
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// Token.h
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//
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// $Id: //poco/1.4/Foundation/include/Poco/Token.h#1 $
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//
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// Library: Foundation
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// Package: Streams
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// Module: StreamTokenizer
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//
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// Definition of the Token class.
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//
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// Copyright (c) 2004-2006, Applied Informatics Software Engineering GmbH.
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// and Contributors.
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//
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// SPDX-License-Identifier: BSL-1.0
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//
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#ifndef Foundation_Token_INCLUDED
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#define Foundation_Token_INCLUDED
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#include "Poco/Foundation.h"
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#include <istream>
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namespace Poco {
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class Foundation_API Token
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/// The base class for all token classes that can be
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/// registered with the StreamTokenizer.
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{
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public:
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enum Class
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{
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IDENTIFIER_TOKEN,
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KEYWORD_TOKEN,
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SEPARATOR_TOKEN,
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OPERATOR_TOKEN,
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STRING_LITERAL_TOKEN,
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CHAR_LITERAL_TOKEN,
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INTEGER_LITERAL_TOKEN,
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LONG_INTEGER_LITERAL_TOKEN,
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FLOAT_LITERAL_TOKEN,
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DOUBLE_LITERAL_TOKEN,
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COMMENT_TOKEN,
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SPECIAL_COMMENT_TOKEN,
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PREPROCESSOR_TOKEN,
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WHITESPACE_TOKEN,
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EOF_TOKEN,
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INVALID_TOKEN,
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USER_TOKEN
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};
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Token();
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/// Creates the Token.
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virtual ~Token();
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/// Destroys the Token.
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virtual bool start(char c, std::istream& istr);
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/// Checks if the given character (and, optionally,
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/// the next character in the input stream) start
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/// a valid token. Returns true if so, false
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/// otherwise.
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///
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/// The current read position in istr must not be
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/// changed. In other words, only the peek() method
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/// of istream may be used.
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///
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/// If the character starts the token, it should
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/// be set as the token's value.
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virtual void finish(std::istream& istr);
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/// Builds the token by reading and appending
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/// the remaining characters from istr.
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virtual Class tokenClass() const;
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/// Returns the kind of the token.
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const std::string& tokenString() const;
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/// Returns the token's raw string.
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virtual std::string asString() const;
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/// Returns a string representation of the token.
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#if defined(POCO_HAVE_INT64)
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virtual Int64 asInteger64() const;
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/// Returns a 64-bit integer representation of the token.
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virtual UInt64 asUnsignedInteger64() const;
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/// Returns an unsigned 64-bit integer representation of the token.
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#endif
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virtual int asInteger() const;
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/// Returns an integer representation of the token.
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virtual unsigned asUnsignedInteger() const;
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/// Returns an unsigned integer representation of the token.
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virtual double asFloat() const;
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/// Returns a floating-point representation of the token.
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virtual char asChar() const;
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/// Returns a char representation of the token.
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bool is(Class tokenClass) const;
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/// Returns true iff the token has the given class.
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protected:
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std::string _value;
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private:
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Token(const Token&);
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Token& operator = (const Token&);
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};
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class Foundation_API InvalidToken: public Token
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/// This token class is used for signalling that
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/// an invalid character sequence has been encountered
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/// in the input stream.
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{
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public:
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InvalidToken();
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~InvalidToken();
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Class tokenClass() const;
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};
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class Foundation_API EOFToken: public Token
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/// This token class is used to signal the
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/// end of the input stream.
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{
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public:
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EOFToken();
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~EOFToken();
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Class tokenClass() const;
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};
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class Foundation_API WhitespaceToken: public Token
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/// This pseudo token class is used to eat
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/// up whitespace in between real tokens.
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{
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public:
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WhitespaceToken();
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~WhitespaceToken();
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Class tokenClass() const;
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bool start(char c, std::istream& istr);
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void finish(std::istream& istr);
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};
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//
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// inlines
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//
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inline const std::string& Token::tokenString() const
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{
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return _value;
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}
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inline bool Token::is(Token::Class cls) const
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{
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return tokenClass() == cls;
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}
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} // namespace Poco
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#endif // Foundation_Token_INCLUDED
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