=encoding utf8

=head1 NAME

Mail::Box::Parser::Perl - reading messages from file using Perl

=head1 INHERITANCE

 Mail::Box::Parser::Perl
   is a Mail::Box::Parser
   is a Mail::Reporter

=head1 SYNOPSIS

=head1 DESCRIPTION

The C<Mail::Box::Parser::Perl> implements parsing of messages
in Perl.  This may be a little slower than the C<C> based parser
L<Mail::Box::Parser::C|Mail::Box::Parser::C>, but will also work on platforms where no C
compiler is available.

Extends L<"DESCRIPTION" in Mail::Box::Parser|Mail::Box::Parser/"DESCRIPTION">.
 
=head1 METHODS

Extends L<"METHODS" in Mail::Box::Parser|Mail::Box::Parser/"METHODS">.
 
=head2 Constructors

Extends L<"Constructors" in Mail::Box::Parser|Mail::Box::Parser/"Constructors">.
 
=over 4

=item Mail::Box::Parser::Perl-E<gt>B<new>(%options)

 -Option           --Defined in       --Default
  file               Mail::Box::Parser  undef
  filename           Mail::Box::Parser  <required>
  fix_header_errors                     <false>
  log                Mail::Reporter     'WARNINGS'
  mode               Mail::Box::Parser  'r'
  trace              Mail::Reporter     'WARNINGS'
  trusted                               <false>

=over 2

=item file => FILE-HANDLE

=item filename => FILENAME

=item fix_header_errors => BOOLEAN

When header errors are detected, the parsing of the header will
be stopped.  Other header lines will become part of the body of
the message.  Set this flag to have the erroneous line added to
the previous header line.

=item log => LEVEL

=item mode => OPENMODE

=item trace => LEVEL

=item trusted => BOOLEAN

Is the input from the file to be trusted, or does it require extra
tests.  Related to L<Mail::Box::new(trusted)|Mail::Box/"Constructors">.

=back

=back

=head2 The parser

Extends L<"The parser" in Mail::Box::Parser|Mail::Box::Parser/"The parser">.
 
=over 4

=item $obj-E<gt>B<fileChanged>()

Inherited, see L<Mail::Box::Parser/"The parser">

=item $obj-E<gt>B<filename>()

Inherited, see L<Mail::Box::Parser/"The parser">

=item $obj-E<gt>B<fixHeaderErrors>( [BOOLEAN] )

If set to C<true>, parsing of a header will not stop on an error, but
attempt to add the erroneous this line to previous field.  Without BOOLEAN,
the current setting is returned.

example: 

 $folder->parser->fixHeaderErrors(1);
 my $folder = $mgr->open('folder', fix_header_errors => 1);

=item $obj-E<gt>B<restart>()

Inherited, see L<Mail::Box::Parser/"The parser">

=item $obj-E<gt>B<start>(%options)

Inherited, see L<Mail::Box::Parser/"The parser">

=item $obj-E<gt>B<stop>()

Inherited, see L<Mail::Box::Parser/"The parser">

=back

=head2 Parsing

Extends L<"Parsing" in Mail::Box::Parser|Mail::Box::Parser/"Parsing">.
 
=over 4

=item $obj-E<gt>B<bodyAsFile>( $fh [$chars, [$lines]] )

Inherited, see L<Mail::Box::Parser/"Parsing">

=item $obj-E<gt>B<bodyAsList>( [$chars, [$lines]] )

Inherited, see L<Mail::Box::Parser/"Parsing">

=item $obj-E<gt>B<bodyAsString>( [$chars, [$lines]] )

Inherited, see L<Mail::Box::Parser/"Parsing">

=item $obj-E<gt>B<bodyDelayed>( [$chars, [$lines]] )

Inherited, see L<Mail::Box::Parser/"Parsing">

=item $obj-E<gt>B<filePosition>( [$position] )

Inherited, see L<Mail::Box::Parser/"Parsing">

=item $obj-E<gt>B<lineSeparator>()

Inherited, see L<Mail::Box::Parser/"Parsing">

=item $obj-E<gt>B<popSeparator>()

Inherited, see L<Mail::Box::Parser/"Parsing">

=item $obj-E<gt>B<pushSeparator>(STRING|Regexp)

Inherited, see L<Mail::Box::Parser/"Parsing">

=item $obj-E<gt>B<readHeader>()

=item $obj-E<gt>B<readSeparator>(%options)

Inherited, see L<Mail::Box::Parser/"Parsing">

=back

=head2 Internals

Extends L<"Internals" in Mail::Box::Parser|Mail::Box::Parser/"Internals">.
 
=over 4

=item $obj-E<gt>B<closeFile>()

Inherited, see L<Mail::Box::Parser/"Internals">

=item $obj-E<gt>B<defaultParserType>( [$class] )

=item Mail::Box::Parser::Perl-E<gt>B<defaultParserType>( [$class] )

Inherited, see L<Mail::Box::Parser/"Internals">

=item $obj-E<gt>B<openFile>($args)

Inherited, see L<Mail::Box::Parser/"Internals">

=item $obj-E<gt>B<takeFileInfo>()

Inherited, see L<Mail::Box::Parser/"Internals">

=back

=head2 Error handling

Extends L<"Error handling" in Mail::Box::Parser|Mail::Box::Parser/"Error handling">.
 
=over 4

=item $obj-E<gt>B<AUTOLOAD>()

Inherited, see L<Mail::Reporter/"Error handling">

=item $obj-E<gt>B<addReport>($object)

Inherited, see L<Mail::Reporter/"Error handling">

=item $obj-E<gt>B<defaultTrace>( [$level]|[$loglevel, $tracelevel]|[$level, $callback] )

=item Mail::Box::Parser::Perl-E<gt>B<defaultTrace>( [$level]|[$loglevel, $tracelevel]|[$level, $callback] )

Inherited, see L<Mail::Reporter/"Error handling">

=item $obj-E<gt>B<errors>()

Inherited, see L<Mail::Reporter/"Error handling">

=item $obj-E<gt>B<log>( [$level, [$strings]] )

=item Mail::Box::Parser::Perl-E<gt>B<log>( [$level, [$strings]] )

Inherited, see L<Mail::Reporter/"Error handling">

=item $obj-E<gt>B<logPriority>($level)

=item Mail::Box::Parser::Perl-E<gt>B<logPriority>($level)

Inherited, see L<Mail::Reporter/"Error handling">

=item $obj-E<gt>B<logSettings>()

Inherited, see L<Mail::Reporter/"Error handling">

=item $obj-E<gt>B<notImplemented>()

Inherited, see L<Mail::Reporter/"Error handling">

=item $obj-E<gt>B<report>( [$level] )

Inherited, see L<Mail::Reporter/"Error handling">

=item $obj-E<gt>B<reportAll>( [$level] )

Inherited, see L<Mail::Reporter/"Error handling">

=item $obj-E<gt>B<trace>( [$level] )

Inherited, see L<Mail::Reporter/"Error handling">

=item $obj-E<gt>B<warnings>()

Inherited, see L<Mail::Reporter/"Error handling">

=back

=head2 Cleanup

Extends L<"Cleanup" in Mail::Box::Parser|Mail::Box::Parser/"Cleanup">.
 
=over 4

=item $obj-E<gt>B<DESTROY>()

Inherited, see L<Mail::Reporter/"Cleanup">

=back

=head1 DIAGNOSTICS

=over 4

=item Warning: File $filename changed during access.

When a message parser starts working, it takes size and modification time
of the file at hand.  If the folder is written, it checks whether there
were changes in the file made by external programs.

Calling L<Mail::Box::update()|Mail::Box/"The folder"> on a folder before it being closed
will read these new messages.  But the real source of this problem is
locking: some external program (for instance the mail transfer agent,
like sendmail) uses a different locking mechanism as you do and therefore
violates your rights.

=item Error: Package $package does not implement $method.

Fatal error: the specific package (or one of its superclasses) does not
implement this method where it should. This message means that some other
related classes do implement this method however the class at hand does
not.  Probably you should investigate this and probably inform the author
of the package.

=item Warning: Unexpected end of header in $source: $line

While parsing a message from the specified source (usually a file name),
the parser found a syntax error.  According to the MIME specification in the
RFCs, each header line must either contain a colon, or start with a blank
to indicate a folded field.  Apparently, this header contains a line which
starts on the first position, but not with a field name.

By default, parsing of the header will be stopped.  If there are more header
lines after the erroneous line, they will be added to the body of the message.
In case of new(fix_headers) set, the parsing of the header will be continued.
The erroneous line will be added to the preceding field.

=back

=head1 SEE ALSO

This module is part of Mail-Message distribution version 3.012,
built on February 11, 2022. Website: F<http://perl.overmeer.net/CPAN/>

=head1 LICENSE

Copyrights 2001-2022 by [Mark Overmeer <markov@cpan.org>]. For other contributors see ChangeLog.

This program is free software; you can redistribute it and/or modify it
under the same terms as Perl itself.
See F<http://dev.perl.org/licenses/>