ClickHouse/base/poco/Foundation/include/Poco/PatternFormatter.h

//
// PatternFormatter.h
//
// Library: Foundation
// Package: Logging
// Module:  PatternFormatter
//
// Definition of the PatternFormatter class.
//
// Copyright (c) 2004-2006, Applied Informatics Software Engineering GmbH.
// and Contributors.
//
// SPDX-License-Identifier:	BSL-1.0
//


#ifndef Foundation_PatternFormatter_INCLUDED
#define Foundation_PatternFormatter_INCLUDED


#include "Poco/Formatter.h"
#include "Poco/Foundation.h"
#include "Poco/Message.h"

#include <vector>

namespace Poco
{


class Foundation_API PatternFormatter : public Formatter
/// This Formatter allows for custom formatting of
/// log messages based on format patterns.
///
/// The format pattern is used as a template to format the message and
/// is copied character by character except for the following special characters,
/// which are replaced by the corresponding value.
///
///   * %s - message source
///   * %t - message text
///   * %l - message priority level (1 .. 7)
///   * %p - message priority (Fatal, Critical, Error, Warning, Notice, Information, Debug, Trace)
///   * %q - abbreviated message priority (F, C, E, W, N, I, D, T)
///   * %P - message process identifier
///   * %T - message thread name
///   * %I - message thread identifier (numeric)
///   * %N - node or host name
///   * %U - message source file path (empty string if not set)
///   * %u - message source line number (0 if not set)
///   * %w - message date/time abbreviated weekday (Mon, Tue, ...)
///   * %W - message date/time full weekday (Monday, Tuesday, ...)
///   * %b - message date/time abbreviated month (Jan, Feb, ...)
///   * %B - message date/time full month (January, February, ...)
///   * %d - message date/time zero-padded day of month (01 .. 31)
///   * %e - message date/time day of month (1 .. 31)
///   * %f - message date/time space-padded day of month ( 1 .. 31)
///   * %m - message date/time zero-padded month (01 .. 12)
///   * %n - message date/time month (1 .. 12)
///   * %o - message date/time space-padded month ( 1 .. 12)
///   * %y - message date/time year without century (70)
///   * %Y - message date/time year with century (1970)
///   * %H - message date/time hour (00 .. 23)
///   * %h - message date/time hour (00 .. 12)
///   * %a - message date/time am/pm
///   * %A - message date/time AM/PM
///   * %M - message date/time minute (00 .. 59)
///   * %S - message date/time second (00 .. 59)
///   * %i - message date/time millisecond (000 .. 999)
///   * %c - message date/time centisecond (0 .. 9)
///   * %F - message date/time fractional seconds/microseconds (000000 - 999999)
///   * %z - time zone differential in ISO 8601 format (Z or +NN.NN)
///   * %Z - time zone differential in RFC format (GMT or +NNNN)
///   * %L - convert time to local time (must be specified before any date/time specifier; does not itself output anything)
///   * %E - epoch time (UTC, seconds since midnight, January 1, 1970)
///   * %v[width] - the message source (%s) but text length is padded/cropped to 'width'
///   * %[name] - the value of the message parameter with the given name
///   * %% - percent sign

{
public:
    PatternFormatter();
    /// Creates a PatternFormatter.
    /// The format pattern must be specified with
    /// a call to setProperty.

    PatternFormatter(const std::string & format);
    /// Creates a PatternFormatter that uses the
    /// given format pattern.

    ~PatternFormatter();
    /// Destroys the PatternFormatter.

    void format(const Message & msg, std::string & text);
    /// Formats the message according to the specified
    /// format pattern and places the result in text.

    void setProperty(const std::string & name, const std::string & value);
    /// Sets the property with the given name to the given value.
    ///
    /// The following properties are supported:
    ///
    ///     * pattern: The format pattern. See the PatternFormatter class
    ///       for details.
    ///     * times: Specifies whether times are adjusted for local time
    ///       or taken as they are in UTC. Supported values are "local" and "UTC".
    ///
    /// If any other property name is given, a PropertyNotSupported
    /// exception is thrown.

    std::string getProperty(const std::string & name) const;
    /// Returns the value of the property with the given name or
    /// throws a PropertyNotSupported exception if the given
    /// name is not recognized.

    static const std::string PROP_PATTERN;
    static const std::string PROP_TIMES;

protected:
    static const std::string & getPriorityName(int);
    /// Returns a string for the given priority value.

private:
    struct PatternAction
    {
        PatternAction() : key(0), length(0) { }

        char key;
        int length;
        std::string property;
        std::string prepend;
    };

    void parsePattern();
    /// Will parse the _pattern string into the vector of PatternActions,
    /// which contains the message key, any text that needs to be written first
    /// a property in case of %[] and required length.

    std::vector<PatternAction> _patternActions;
    bool _localTime;
    std::string _pattern;
};


} // namespace Poco


#endif // Foundation_PatternFormatter_INCLUDED