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126 lines
4.3 KiB
TeX
126 lines
4.3 KiB
TeX
\section{\module{ConfigParser} ---
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Configuration file parser}
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\declaremodule{standard}{ConfigParser}
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\modulesynopsis{Configuration file parser.}
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\sectionauthor{Christopher G. Petrilli}{petrilli@amber.org}
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This module defines the class \class{ConfigParser}. The
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\class{ConfigParser} class implements a basic configuration file
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parser language which provides a structure similar to what you would
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find on Microsoft Windows INI files. You can use this to write Python
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programs which can be customized by end users easily.
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The configuration file consists of sections, lead by a
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\samp{[section]} header and followed by \samp{name: value} entries,
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with continuations in the style of \rfc{822}. The optional values
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can contain format strings which refer to other values in the same
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section, or values in a special \code{DEFAULT} section. Additional
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defaults can be provided upon initialization and retrieval. Lines
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beginning with \character{\#} are ignored and may be used to provide
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comments.
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For example:
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\begin{verbatim}
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foodir: %(dir)s/whatever
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\end{verbatim}
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would resolve the \samp{\%(dir)s} to the value of dir. All reference
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expansions are done late, on demand.
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Intrinsic defaults can be specified by passing them into the
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\class{ConfigParser} constructor as a dictionary. Additional defaults
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may be passed into the \method{get} method which will override all
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others.
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\begin{classdesc}{ConfigParser}{\optional{defaults}}
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Return a new instance of the \class{ConfigParser} class. When
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\var{defaults} is given, it is initialized into the dictionairy of
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intrinsic defaults. They keys must be strings, and the values must be
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appropriate for the \samp{\%()s} string interpolation. Note that
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\var{__name__} is always an intrinsic default; its value is the
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section name.
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\end{classdesc}
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\begin{excdesc}{NoSectionError}
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Exception raised when a specified section is not found.
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\end{excdesc}
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\begin{excdesc}{DuplicateSectionError}
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Exception raised when mutliple sections with the same name are found.
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\end{excdesc}
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\begin{excdesc}{NoOptionError}
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Exception raised when a specified option is not found in the specified
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section.
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\end{excdesc}
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\begin{excdesc}{InterpolationError}
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Exception raised when problems occur performing string interpolation.
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\end{excdesc}
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\begin{excdesc}{MissingSectionHeaderError}
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Exception raised when attempting to parse a file which has no section
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headers.
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\end{excdesc}
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\begin{excdesc}{ParsingError}
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Exception raised when errors occur attempting to parse a file.
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\end{excdesc}
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\begin{seealso}
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\seemodule{shlex}{Support for a creating \UNIX{} shell-like
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minilanguages which can be used as an alternate format
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for application configuration files.}
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\end{seealso}
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\subsection{ConfigParser Objects \label{ConfigParser-objects}}
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\class{ConfigParser} instances have the following methods:
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\begin{methoddesc}{defaults}{}
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Return a dictionairy containing the instance-wide defaults.
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\end{methoddesc}
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\begin{methoddesc}{sections}{}
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Return a list of the sections available.
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\end{methoddesc}
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\begin{methoddesc}{has_section}{section}
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Indicates whether the named section is present in the
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configuration. The \code{DEFAULT} section is not acknowledged.
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\end{methoddesc}
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\begin{methoddesc}{options}{section}
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Returns a list of options available in the specified \var{section}.
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\end{methoddesc}
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\begin{methoddesc}{read}{filenames}
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Read and parse a list of filenames.
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\end{methoddesc}
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\begin{methoddesc}{get}{section, option\optional{, raw\optional{, vars}}}
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Get an \var{option} value for the provided \var{section}. All the
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\character{\%} interpolations are expanded in the return values, based on
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the defaults passed into the constructor, as well as the options
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\var{vars} provided, unless the \var{raw} argument is true.
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\end{methoddesc}
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\begin{methoddesc}{getint}{section, option}
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A convenience method which coerces the \var{option} in the specified
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\var{section} to an integer.
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\end{methoddesc}
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\begin{methoddesc}{getfloat}{section, option}
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A convenience method which coerces the \var{option} in the specified
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\var{section} to a floating point number.
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\end{methoddesc}
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\begin{methoddesc}{getboolean}{section, option}
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A convenience method which coerces the \var{option} in the specified
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\var{section} to a boolean value. Note that the only accepted values
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for the option are \code{0} and \code{1}, any others will raise
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\exception{ValueError}.
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\end{methoddesc}
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