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diff --git a/src/lib/dns/master_lexer.h b/src/lib/dns/master_lexer.h new file mode 100644 index 0000000..9ed4e81 --- /dev/null +++ b/src/lib/dns/master_lexer.h @@ -0,0 +1,678 @@ +// Copyright (C) 2012-2015 Internet Systems Consortium, Inc. ("ISC") +// +// This Source Code Form is subject to the terms of the Mozilla Public +// License, v. 2.0. If a copy of the MPL was not distributed with this +// file, You can obtain one at http://mozilla.org/MPL/2.0/. + +#ifndef MASTER_LEXER_H +#define MASTER_LEXER_H 1 + +#include <dns/exceptions.h> + +#include <istream> +#include <string> + +#include <stdint.h> + +#include <boost/noncopyable.hpp> + +namespace isc { +namespace dns { +namespace master_lexer_internal { +class State; +} + +/// \brief Tokens for \c MasterLexer +/// +/// This is a simple value-class encapsulating a type of a lexer token and +/// (if it has a value) its value. Essentially, the class provides +/// constructors corresponding to different types of tokens, and corresponding +/// getter methods. The type and value are fixed at the time of construction +/// and will never be modified throughout the lifetime of the object. +/// The getter methods are still provided to maximize the safety; an +/// application cannot refer to a value that is invalid for the type of token. +/// +/// This class is intentionally implemented as copyable and assignable +/// (using the default version of copy constructor and assignment operator), +/// but it's mainly for internal implementation convenience. Applications will +/// simply refer to Token object as a reference via the \c MasterLexer class. +class MasterToken { +public: + /// \brief Enumeration for token types + /// + /// \note At the time of initial implementation, all numeric tokens + /// that would be extracted from \c MasterLexer should be represented + /// as an unsigned 32-bit integer. If we see the need for larger integers + /// or negative numbers, we can then extend the token types. + enum Type { + END_OF_LINE, ///< End of line detected + END_OF_FILE, ///< End of file detected + INITIAL_WS, ///< White spaces at the beginning of a line after an + ///< end of line or at the beginning of file (if asked + // for detecting it) + NOVALUE_TYPE_MAX = INITIAL_WS, ///< Max integer corresponding to + /// no-value (type only) types. + /// Mainly for internal use. + STRING, ///< A single string + QSTRING, ///< A single string quoted by double-quotes ("). + NUMBER, ///< A decimal number (unsigned 32-bit) + ERROR ///< Error detected in getting a token + }; + + /// \brief Enumeration for lexer error codes + enum ErrorCode { + NOT_STARTED, ///< The lexer is just initialized and has no token + UNBALANCED_PAREN, ///< Unbalanced parentheses detected + UNEXPECTED_END, ///< The lexer reaches the end of line or file + /// unexpectedly + UNBALANCED_QUOTES, ///< Unbalanced quotations detected + NO_TOKEN_PRODUCED, ///< No token was produced. This means programmer + /// error and should never get out of the lexer. + NUMBER_OUT_OF_RANGE, ///< Number was out of range + BAD_NUMBER, ///< Number is expected but not recognized + UNEXPECTED_QUOTES, ///< Unexpected quotes character detected + MAX_ERROR_CODE ///< Max integer corresponding to valid error codes. + /// (excluding this one). Mainly for internal use. + }; + + /// \brief A simple representation of a range of a string. + /// + /// This is a straightforward pair of the start pointer of a string + /// and its length. The \c STRING and \c QSTRING types of tokens + /// will be primarily represented in this form. + /// + /// Any character can be stored in the valid range of the region. + /// In particular, there can be a nul character (\0) in the middle of + /// the region. So the usual string manipulation API may not work + /// as expected. + /// + /// The `MasterLexer` implementation ensures that there are at least + /// len + 1 bytes of valid memory region starting from beg, and that + /// beg[len] is \0. This means the application can use the bytes as a + /// validly nul-terminated C string if there is no intermediate nul + /// character. Note also that due to this property beg is always non + /// NULL; for an empty string len will be set to 0 and beg[0] is \0. + struct StringRegion { + const char* beg; ///< The start address of the string + size_t len; ///< The length of the string in bytes + }; + + /// \brief Constructor for non-value type of token. + /// + /// \throw InvalidParameter A value type token is specified. + /// \param type The type of the token. It must indicate a non-value + /// type (not larger than \c NOVALUE_TYPE_MAX). + explicit MasterToken(Type type) : type_(type) { + if (type > NOVALUE_TYPE_MAX) { + isc_throw(InvalidParameter, "Token per-type constructor " + "called with invalid type: " << type); + } + } + + /// \brief Constructor for string and quoted-string types of token. + /// + /// The optional \c quoted parameter specifies whether it's a quoted or + /// non quoted string. + /// + /// The string is specified as a pair of a pointer to the start address + /// and its length. Any character can be contained in any position of + /// the valid range (see \c StringRegion). + /// + /// When it's a quoted string, the quotation marks must be excluded + /// from the specified range. + /// + /// \param str_beg The start address of the string + /// \param str_len The size of the string in bytes + /// \param quoted true if it's a quoted string; false otherwise. + MasterToken(const char* str_beg, size_t str_len, bool quoted = false) : + type_(quoted ? QSTRING : STRING) + { + val_.str_region_.beg = str_beg; + val_.str_region_.len = str_len; + } + + /// \brief Constructor for number type of token. + /// + /// \brief number An unsigned 32-bit integer corresponding to the token + /// value. + explicit MasterToken(uint32_t number) : type_(NUMBER) { + val_.number_ = number; + } + + /// \brief Constructor for error type of token. + /// + /// \throw InvalidParameter Invalid error code value is specified. + /// \brief error_code A pre-defined constant of \c ErrorCode. + explicit MasterToken(ErrorCode error_code) : type_(ERROR) { + if (!(error_code < MAX_ERROR_CODE)) { + isc_throw(InvalidParameter, "Invalid master lexer error code: " + << error_code); + } + val_.error_code_ = error_code; + } + + /// \brief Return the token type. + /// + /// \throw none + Type getType() const { return (type_); } + + /// \brief Return the value of a string-variant token. + /// + /// \throw InvalidOperation Called on a non string-variant types of token. + /// \return A reference to \c StringRegion corresponding to the string + /// token value. + const StringRegion& getStringRegion() const { + if (type_ != STRING && type_ != QSTRING) { + isc_throw(InvalidOperation, + "Token::getStringRegion() for non string-variant type"); + } + return (val_.str_region_); + } + + /// \brief Return the value of a string-variant token as a string object. + /// + /// Note that the underlying string may contain a nul (\0) character + /// in the middle. The returned string object will contain all characters + /// of the valid range of the underlying string. So some string + /// operations such as c_str() may not work as expected. + /// + /// \throw InvalidOperation Called on a non string-variant types of token. + /// \throw std::bad_alloc Resource allocation failure in constructing the + /// string object. + /// \return A std::string object corresponding to the string token value. + std::string getString() const { + std::string ret; + getString(ret); + return (ret); + } + + /// \brief Fill in a string with the value of a string-variant token. + /// + /// This is similar to the other version of \c getString(), but + /// the caller is supposed to pass a placeholder string object. + /// This will be more efficient if the caller uses the same + /// \c MasterLexer repeatedly and needs to get string token in the + /// form of a string object many times as this version could reuse + /// the existing internal storage of the passed string. + /// + /// Any existing content of the passed string will be removed. + /// + /// \throw InvalidOperation Called on a non string-variant types of token. + /// \throw std::bad_alloc Resource allocation failure in constructing the + /// string object. + /// + /// \param ret A string object to be filled with the token string. + void getString(std::string& ret) const { + if (type_ != STRING && type_ != QSTRING) { + isc_throw(InvalidOperation, + "Token::getString() for non string-variant type"); + } + ret.assign(val_.str_region_.beg, + val_.str_region_.beg + val_.str_region_.len); + } + + /// \brief Return the value of a string-variant token as a string object. + /// + /// \throw InvalidOperation Called on a non number type of token. + /// \return The integer corresponding to the number token value. + uint32_t getNumber() const { + if (type_ != NUMBER) { + isc_throw(InvalidOperation, + "Token::getNumber() for non number type"); + } + return (val_.number_); + } + + /// \brief Return the error code of a error type token. + /// + /// \throw InvalidOperation Called on a non error type of token. + /// \return The error code of the token. + ErrorCode getErrorCode() const { + if (type_ != ERROR) { + isc_throw(InvalidOperation, + "Token::getErrorCode() for non error type"); + } + return (val_.error_code_); + }; + + /// \brief Return a textual description of the error of a error type token. + /// + /// The returned string would be useful to produce a log message when + /// a zone file parser encounters an error. + /// + /// \throw InvalidOperation Called on a non error type of token. + /// \throw std::bad_alloc Resource allocation failure in constructing the + /// string object. + /// \return A string object that describes the meaning of the error. + std::string getErrorText() const; + +private: + Type type_; // this is not const so the class can be assignable + + // We use a union to represent different types of token values via the + // unified Token class. The class integrity should ensure valid operation + // on the union; getter methods should only refer to the member set at + // the construction. + union { + StringRegion str_region_; + uint32_t number_; + ErrorCode error_code_; + } val_; +}; + +/// \brief Tokenizer for parsing DNS master files. +/// +/// The \c MasterLexer class provides tokenize interfaces for parsing DNS +/// master files. It understands some special rules of master files as +/// defined in RFC 1035, such as comments, character escaping, and multi-line +/// data, and provides the user application with the actual data in a +/// more convenient form such as a std::string object. +/// +/// In order to support the $INCLUDE notation, this class is designed to be +/// able to operate on multiple files or input streams in the nested way. +/// The \c pushSource() and \c popSource() methods correspond to the push +/// and pop operations. +/// +/// While this class is public, it is less likely to be used by normal +/// applications; it's mainly expected to be used within this library, +/// specifically by the \c MasterLoader class and \c Rdata implementation +/// classes. +/// +/// \note The error handling policy of this class is slightly different from +/// that of other classes of this library. We generally throw an exception +/// for an invalid input, whether it's more likely to be a program error or +/// a "user error", which means an invalid input that comes from outside of +/// the library. But, this class returns an error code for some certain +/// types of user errors instead of throwing an exception. Such cases include +/// a syntax error identified by the lexer or a misspelled file name that +/// causes a system error at the time of open. This is based on the assumption +/// that the main user of this class is a parser of master files, where +/// we want to give an option to ignore some non fatal errors and continue +/// the parsing. This will be useful if it just performs overall error +/// checks on a master file. When the (immediate) caller needs to do explicit +/// error handling, exceptions are not that a useful tool for error reporting +/// because we cannot separate the normal and error cases anyway, which would +/// be one major advantage when we use exceptions. And, exceptions are +/// generally more expensive, either when it happens or just by being able +/// to handle with \c try and \c catch (depending on the underlying +/// implementation of the exception handling). For these reasons, some of +/// this class does not throw for an error that would be reported as an +/// exception in other classes. +class MasterLexer : public boost::noncopyable { + friend class master_lexer_internal::State; +public: + /// \brief Exception thrown when we fail to read from the input + /// stream or file. + class ReadError : public Unexpected { + public: + ReadError(const char* file, size_t line, const char* what) : + Unexpected(file, line, what) + {} + }; + + /// \brief Exception thrown from a wrapper version of + /// \c MasterLexer::getNextToken() for non fatal errors. + /// + /// See the method description for more details. + /// + /// The \c token_ member variable (read-only) is set to a \c MasterToken + /// object of type ERROR indicating the reason for the error. + class LexerError : public isc::dns::Exception { + public: + LexerError(const char* file, size_t line, MasterToken error_token) : + isc::dns::Exception(file, line, error_token.getErrorText().c_str()), + token_(error_token) + {} + const MasterToken token_; + }; + + /// \brief Special value for input source size meaning "unknown". + /// + /// This constant value will be used as a return value of + /// \c getTotalSourceSize() when the size of one of the pushed sources + /// is unknown. Note that this value itself is a valid integer in the + /// range of the type, so there's still a small possibility of + /// ambiguity. In practice, however, the value should be sufficiently + /// large that should eliminate the possibility. + static const size_t SOURCE_SIZE_UNKNOWN; + + /// \brief Options for getNextToken. + /// + /// A compound option, indicating multiple options are set, can be + /// specified using the logical OR operator (operator|()). + enum Options { + NONE = 0, ///< No option + INITIAL_WS = 1, ///< recognize begin-of-line spaces after an + ///< end-of-line + QSTRING = 2, ///< recognize quoted string + NUMBER = 4 ///< recognize numeric text as integer + }; + + /// \brief The constructor. + /// + /// \throw std::bad_alloc Internal resource allocation fails (rare case). + MasterLexer(); + + /// \brief The destructor. + /// + /// It internally closes any remaining input sources. + ~MasterLexer(); + + /// \brief Open a file and make it the current input source of MasterLexer. + /// + /// The opened file can be explicitly closed by the \c popSource() method; + /// if \c popSource() is not called within the lifetime of the + /// \c MasterLexer, it will be closed in the destructor. + /// + /// In the case possible system errors in opening the file (most likely + /// because of specifying a non-existent or unreadable file), it returns + /// false, and if the optional \c error parameter is non NULL, it will be + /// set to a description of the error (any existing content of the string + /// will be discarded). If opening the file succeeds, the given + /// \c error parameter will be intact. + /// + /// Note that this method has two styles of error reporting: one by + /// returning \c false (and setting \c error optionally) and the other + /// by throwing an exception. See the note for the class description + /// about the distinction. + /// + /// \throw InvalidParameter filename is NULL + /// \param filename A non NULL string specifying a master file + /// \param error If non null, a placeholder to set error description in + /// case of failure. + /// + /// \return true if pushing the file succeeds; false otherwise. + bool pushSource(const char* filename, std::string* error = NULL); + + /// \brief Make the given stream the current input source of MasterLexer. + /// + /// The caller still holds the ownership of the passed stream; it's the + /// caller's responsibility to keep it valid as long as it's used in + /// \c MasterLexer or to release any resource for the stream after that. + /// The caller can explicitly tell \c MasterLexer to stop using the + /// stream by calling the \c popSource() method. + /// + /// The data in \c input must be complete at the time of this call. + /// The behavior of the lexer is undefined if the caller builds or adds + /// data in \c input after pushing it. + /// + /// Except for rare case system errors such as memory allocation failure, + /// this method is generally expected to be exception free. However, + /// it can still throw if it encounters an unexpected failure when it + /// tries to identify the "size" of the input source (see + /// \c getTotalSourceSize()). It's an unexpected result unless the + /// caller intentionally passes a broken stream; otherwise it would mean + /// some system-dependent unexpected behavior or possibly an internal bug. + /// In these cases it throws an \c Unexpected exception. Note that + /// this version of the method doesn't return a boolean unlike the + /// other version that takes a file name; since this failure is really + /// unexpected and can be critical, it doesn't make sense to give the + /// caller an option to continue (other than by explicitly catching the + /// exception). + /// + /// \throw Unexpected An unexpected failure happens in initialization. + /// + /// \param input An input stream object that produces textual + /// representation of DNS RRs. + void pushSource(std::istream& input); + + /// \brief Stop using the most recently opened input source (file or + /// stream). + /// + /// If it's a file, the previously opened file will be closed internally. + /// If it's a stream, \c MasterLexer will simply stop using + /// the stream; the caller can assume it will be never used in + /// \c MasterLexer thereafter. + /// + /// This method must not be called when there is no source pushed for + /// \c MasterLexer. This method is otherwise exception free. + /// + /// \throw isc::InvalidOperation Called with no pushed source. + void popSource(); + + /// \brief Get number of sources inside the lexer. + /// + /// This method never throws. + size_t getSourceCount() const; + + /// \brief Return the name of the current input source name. + /// + /// If it's a file, it will be the C string given at the corresponding + /// \c pushSource() call, that is, its filename. If it's a stream, it will + /// be formatted as \c "stream-%p" where \c %p is hex representation + /// of the address of the stream object. + /// + /// If there is no opened source at the time of the call, this method + /// returns an empty string. + /// + /// \throw std::bad_alloc Resource allocation failed for string + /// construction (rare case) + /// + /// \return A string representation of the current source (see the + /// description) + std::string getSourceName() const; + + /// \brief Return the input source line number. + /// + /// If there is an opened source, the return value will be a non-0 + /// integer indicating the line number of the current source where + /// the \c MasterLexer is currently working. The expected usage of + /// this value is to print a helpful error message when parsing fails + /// by specifically identifying the position of the error. + /// + /// If there is no opened source at the time of the call, this method + /// returns 0. + /// + /// \throw None + /// + /// \return The current line number of the source (see the description) + size_t getSourceLine() const; + + /// \brief Return the total size of pushed sources. + /// + /// This method returns the sum of the size of sources that have been + /// pushed to the lexer by the time of the call. It would give the + /// caller some hint about the amount of data the lexer is working on. + /// + /// The size of a normal file is equal to the file size at the time of + /// the source is pushed. The size of other type of input stream is + /// the size of the data available in the stream at the time of the + /// source is pushed. + /// + /// In some special cases, it's possible that the size of the file or + /// stream is unknown. It happens, for example, if the standard input + /// is associated with a pipe from the output of another process and it's + /// specified as an input source. If the size of some of the pushed + /// source is unknown, this method returns SOURCE_SIZE_UNKNOWN. + /// + /// The total size won't change when a source is popped. So the return + /// values of this method will monotonically increase or + /// \c SOURCE_SIZE_UNKNOWN; once it returns \c SOURCE_SIZE_UNKNOWN, + /// any subsequent call will also result in that value, by the above + /// definition. + /// + /// Before pushing any source, it returns 0. + /// + /// \throw None + size_t getTotalSourceSize() const; + + /// \brief Return the position of lexer in the pushed sources so far. + /// + /// This method returns the position in terms of the number of recognized + /// characters from all sources that have been pushed by the time of the + /// call. Conceptually, the position in a single source is the offset + /// from the beginning of the file or stream to the current "read cursor" + /// of the lexer. The return value of this method is the sum of the + /// positions in all the pushed sources. If any of the sources has + /// already been popped, the position of the source at the time of the + /// pop operation will be used for the calculation. + /// + /// If the lexer reaches the end for each of all the pushed sources, + /// the return value should be equal to that of \c getTotalSourceSize(). + /// It's generally expected that a source is popped when the lexer + /// reaches the end of the source. So, when the application of this + /// class parses all contents of all sources, possibly with multiple + /// pushes and pops, the return value of this method and + /// \c getTotalSourceSize() should be identical (unless the latter + /// returns SOURCE_SIZE_UNKNOWN). But this is not necessarily + /// guaranteed as the application can pop a source in the middle of + /// parsing it. + /// + /// Before pushing any source, it returns 0. + /// + /// The return values of this method and \c getTotalSourceSize() would + /// give the caller an idea of the progress of the lexer at the time of + /// the call. Note, however, that since it's not predictable whether + /// more sources will be pushed after the call, the progress determined + /// this way may not make much sense; it can only give an informational + /// hint of the progress. + /// + /// Note that the conceptual "read cursor" would move backward after a + /// call to \c ungetToken(), in which case this method will return a + /// smaller value. That is, unlike \c getTotalSourceSize(), return + /// values of this method may not always monotonically increase. + /// + /// \throw None + size_t getPosition() const; + + /// \brief Parse and return another token from the input. + /// + /// It reads a bit of the last opened source and produces another token + /// found in it. + /// + /// This method does not provide the strong exception guarantee. Generally, + /// if it throws, the object should not be used any more and should be + /// discarded. It was decided all the exceptions thrown from here are + /// serious enough that aborting the loading process is the only reasonable + /// recovery anyway, so the strong exception guarantee is not needed. + /// + /// \param options The options can be used to modify the tokenization. + /// The method can be made reporting things which are usually ignored + /// by this parameter. Multiple options can be passed at once by + /// bitwise or (eg. option1 | option 2). See description of available + /// options. + /// \return Next token found in the input. Note that the token refers to + /// some internal data in the lexer. It is valid only until + /// getNextToken or ungetToken is called. Also, the token becomes + /// invalid when the lexer is destroyed. + /// \throw isc::InvalidOperation in case the source is not available. This + /// may mean the pushSource() has not been called yet, or that the + /// current source has been read past the end. + /// \throw ReadError in case there's problem reading from the underlying + /// source (eg. I/O error in the file on the disk). + /// \throw std::bad_alloc in case allocation of some internal resources + /// or the token fail. + const MasterToken& getNextToken(Options options = NONE); + + /// \brief Parse the input for the expected type of token. + /// + /// This method is a wrapper of the other version, customized for the case + /// where a particular type of token is expected as the next one. + /// More specifically, it's intended to be used to get tokens for RDATA + /// fields. Since most RDATA types of fixed format, the token type is + /// often predictable and the method interface can be simplified. + /// + /// This method basically works as follows: it gets the type of the + /// expected token, calls the other version of \c getNextToken(Options), + /// and returns the token if it's of the expected type (due to the usage + /// assumption this should be normally the case). There are some non + /// trivial details though: + /// + /// - If the expected type is MasterToken::QSTRING, both quoted and + /// unquoted strings are recognized and returned. + /// - A string with quotation marks is not recognized as a + /// - MasterToken::STRING. You have to get it as a + /// - MasterToken::QSTRING. + /// - If the optional \c eol_ok parameter is \c true (very rare case), + /// MasterToken::END_OF_LINE and MasterToken::END_OF_FILE are recognized + /// and returned if they are found instead of the expected type of + /// token. + /// - If the next token is not of the expected type (including the case + /// a number is expected but it's out of range), ungetToken() is + /// internally called so the caller can re-read that token. + /// - If other types or errors (such as unbalanced parentheses) are + /// detected, the erroneous part isn't "ungotten"; the caller can + /// continue parsing after that part. + /// + /// In some very rare cases where the RDATA has an optional trailing field, + /// the \c eol_ok parameter would be set to \c true. This way the caller + /// can handle both cases (the field does or does not exist) by a single + /// call to this method. In all other cases \c eol_ok should be set to + /// \c false, and that is the default and can be omitted. + /// + /// Unlike the other version of \c getNextToken(Options), this method + /// throws an exception of type \c LexerError for non fatal errors such as + /// broken syntax or encountering an unexpected type of token. This way + /// the caller can write RDATA parser code without bothering to handle + /// errors for each field. For example, pseudo parser code for MX RDATA + /// would look like this: + /// \code + /// const uint32_t pref = + /// lexer.getNextToken(MasterToken::NUMBER).getNumber(); + /// // check if pref is the uint16_t range; no other check is needed. + /// const Name mx(lexer.getNextToken(MasterToken::STRING).getString()); + /// \endcode + /// + /// In the case where \c LexerError exception is thrown, it's expected + /// to be handled comprehensively for the parser of the RDATA or at a + /// higher layer. The \c token_ member variable of the corresponding + /// \c LexerError exception object stores a token of type + /// \c MasterToken::ERROR that indicates the reason for the error. + /// + /// Due to the specific intended usage of this method, only a subset + /// of \c MasterToken::Type values are acceptable for the \c expect + /// parameter: \c MasterToken::STRING, \c MasterToken::QSTRING, and + /// \c MasterToken::NUMBER. Specifying other values will result in + /// an \c InvalidParameter exception. + /// + /// \throw InvalidParameter The expected token type is not allowed for + /// this method. + /// \throw LexerError The lexer finds non fatal error or it finds an + /// \throw other Anything the other version of getNextToken() can throw. + /// + /// \param expect Expected type of token. Must be either STRING, QSTRING, + /// or NUMBER. + /// \param eol_ok \c true iff END_OF_LINE or END_OF_FILE is acceptable. + /// \return The expected type of token. + const MasterToken& getNextToken(MasterToken::Type expect, + bool eol_ok = false); + + /// \brief Return the last token back to the lexer. + /// + /// The method undoes the lasts call to getNextToken(). If you call the + /// getNextToken() again with the same options, it'll return the same + /// token. If the options are different, it may return a different token, + /// but it acts as if the previous getNextToken() was never called. + /// + /// It is possible to return only one token back in time (you can't call + /// ungetToken() twice in a row without calling getNextToken() in between + /// successfully). + /// + /// It does not work after change of source (by pushSource or popSource). + /// + /// \throw isc::InvalidOperation If called second time in a row or if + /// getNextToken() was not called since the last change of the source. + void ungetToken(); + +private: + struct MasterLexerImpl; + MasterLexerImpl* impl_; +}; + +/// \brief Operator to combine \c MasterLexer options +/// +/// This is a trivial shortcut so that compound options can be specified +/// in an intuitive way. +inline MasterLexer::Options +operator|(MasterLexer::Options o1, MasterLexer::Options o2) { + return (static_cast<MasterLexer::Options>( + static_cast<unsigned>(o1) | static_cast<unsigned>(o2))); +} + +} // namespace dns +} // namespace isc +#endif // MASTER_LEXER_H + +// Local Variables: +// mode: c++ +// End: |