24 May 2021 11:36:26 UTC
- Distribution: FunctionalPerl
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- License: perl_5
- Perl: v5.16.4
- Activity24 month
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- Latest version++ed by:3 non-PAUSE usersPFLANZE Christian Jaegerand 1 contributors
- Christian Jaeger
my $f = new Chj::IO::File; $f->xopen("<foo/file.txt"); my $g = Chj::IO::File->xopen("<foo/file.txt"); ...
Something like IO::File, but more lightweight (IO::File takes about 0.3 seconds to load on my laptop, whereas this module takes less than 30ms), and with methods that throw (currently untyped) exceptions on error.
NEW: $Chj::IO::ERRNO is set to $!+0 on strategic positions $Chj::IO::ERRSTR to $! for later reference. HACK state is creeping in. Because of ugly Perl bugs. todo finish putting those into every other part of these modules.
- new ("path")
Gives a new unopened filehandle object. (Not really sure what for; you should be able to use perl builtins on it.)
- xopen (path [,.. ])
Creates new filehandle and calls builtin open, croaks on errors. (May also be called on an existing object if I'm not wrong.)
- read ( $buf, numbytes [, offset ] )
- xread ( ... )
Calls builtin, without/with error checking.
- xreadline ()
Same as builtin readline, but checks $! for errors. (Not sure that really works.)
- xreadline_chomp ()
Does xreadline and chomp's the result(s) (unless undefined).
Same as <$self>. Added since MIME::Parse expects this method.
- xreadchunk ( length )
Read a chunk of max length chars/bytes and return it. Return undef on end of file.
# IDEA: xxreadchunk that throws exception on end of file? So no check needed.
- xxreadchunk ( length )
# Yeah try it. Only string exception so far
- xreadchar ()
Read one character (can be more than one byte from the source filehandle if an encoding is set on the filehandle).
- xsysreadcompletely( buf, length [,offset]) -> bool
Like xsysread, but resumes reading upon intterrupted system calls and partial reads from pipes until the required length has been read. Returns true if buf was read completely, false on EOF upon start of message. EOF after having read part but not all of buf results in an exception.
- xsyswritecompletely( buf [,length [,offset]])
Like xsyswrite, but resumes writing upon interrupted system calls until everything is written. Does not return anything.
Returns full contents. Latter also checks $! for errors (see above).
- seek / xseek
Only special thing is that if you only give one argument, it does imply SEEK_SET as the whence value. (Hmmm well, there's also xrewind for xseek(0) purpose.)
- truncate / xtruncate
Totally normal. Just let me state that if your file pointer will not be changed by this call, so be sure to call xrewind as well if you plan to continue to write to the file handle.
I wanted to overload <> to xreadline(), but that does not work (on perl 5.6.1), since the CORE::readline function will call into <> again causing an infinite recursion. There does not seem to be a solution, thus I leave <> the default (without error checking).
(BTW there's another perl bug: http://bugs6.perl.org/rt2/Ticket/Display.html?id=6748 )
Not yet fully tested.
This is alpha software! Read the status section in the package README or on the website.
Module Install Instructions
To install FunctionalPerl, copy and paste the appropriate command in to your terminal.
perl -MCPAN -e shell install FunctionalPerl
For more information on module installation, please visit the detailed CPAN module installation guide.