NAME¶

IO::ScalarArray - IO:: interface for reading/writing an array of scalars

SYNOPSIS¶

Perform I/O on strings, using the basic OO interface...

    use IO::ScalarArray;
    @data = ("My mes", "sage:\n");
    ### Open a handle on an array, and append to it:
    $AH = new IO::ScalarArray \@data;
    $AH->print("Hello");       
    $AH->print(", world!\nBye now!\n");  
    print "The array is now: ", @data, "\n";
    ### Open a handle on an array, read it line-by-line, then close it:
    $AH = new IO::ScalarArray \@data;
    while (defined($_ = $AH->getline)) { 
        print "Got line: $_";
    }
    $AH->close;
    ### Open a handle on an array, and slurp in all the lines:
    $AH = new IO::ScalarArray \@data;
    print "All lines:\n", $AH->getlines; 
    ### Get the current position (either of two ways):
    $pos = $AH->getpos;         
    $offset = $AH->tell;  
    ### Set the current position (either of two ways):
    $AH->setpos($pos);        
    $AH->seek($offset, 0);
    ### Open an anonymous temporary array:
    $AH = new IO::ScalarArray;
    $AH->print("Hi there!");
    print "I printed: ", @{$AH->aref}, "\n";      ### get at value

Don't like OO for your I/O? No problem. Thanks to the magic of an invisible tie(), the following now works out of the box, just as it does with IO::Handle:

    use IO::ScalarArray;
    @data = ("My mes", "sage:\n");
    ### Open a handle on an array, and append to it:
    $AH = new IO::ScalarArray \@data;
    print $AH "Hello";    
    print $AH ", world!\nBye now!\n";
    print "The array is now: ", @data, "\n";
    ### Open a handle on a string, read it line-by-line, then close it:
    $AH = new IO::ScalarArray \@data;
    while (<$AH>) {
        print "Got line: $_";
    }
    close $AH;
    ### Open a handle on a string, and slurp in all the lines:
    $AH = new IO::ScalarArray \@data;
    print "All lines:\n", <$AH>;
    ### Get the current position (WARNING: requires 5.6):
    $offset = tell $AH;
    ### Set the current position (WARNING: requires 5.6):
    seek $AH, $offset, 0;
    ### Open an anonymous temporary scalar:
    $AH = new IO::ScalarArray;
    print $AH "Hi there!";
    print "I printed: ", @{$AH->aref}, "\n";      ### get at value

And for you folks with 1.x code out there: the old tie() style still works, though this is unnecessary and deprecated:

    use IO::ScalarArray;
    ### Writing to a scalar...
    my @a; 
    tie *OUT, 'IO::ScalarArray', \@a;
    print OUT "line 1\nline 2\n", "line 3\n";
    print "Array is now: ", @a, "\n"
    ### Reading and writing an anonymous scalar... 
    tie *OUT, 'IO::ScalarArray';
    print OUT "line 1\nline 2\n", "line 3\n";
    tied(OUT)->seek(0,0);
    while (<OUT>) { 
        print "Got line: ", $_;
    }

DESCRIPTION¶

This class is part of the IO::Stringy distribution; see IO::Stringy for change log and general information.

The IO::ScalarArray class implements objects which behave just like IO::Handle (or FileHandle) objects, except that you may use them to write to (or read from) arrays of scalars. Logically, an array of scalars defines an in-core "file" whose contents are the concatenation of the scalars in the array. The handles created by this class are automatically tiehandle'd (though please see "WARNINGS" for information relevant to your Perl version).

For writing large amounts of data with individual print() statements, this class is likely to be more efficient than IO::Scalar.

Basically, this:

    my @a;
    $AH = new IO::ScalarArray \@a;
    $AH->print("Hel", "lo, ");         ### OO style
    $AH->print("world!\n");            ### ditto

Or this:

    my @a;
    $AH = new IO::ScalarArray \@a;
    print $AH "Hel", "lo, ";           ### non-OO style
    print $AH "world!\n";              ### ditto

Causes @a to be set to the following array of 3 strings:

    ( "Hel" , 
      "lo, " , 
      "world!\n" )

See IO::Scalar and compare with this class.

PUBLIC INTERFACE¶

WARNINGS¶

Perl's TIEHANDLE spec was incomplete prior to 5.005_57; it was missing support for "seek()", "tell()", and "eof()". Attempting to use these functions with an IO::ScalarArray will not work prior to 5.005_57. IO::ScalarArray will not have the relevant methods invoked; and even worse, this kind of bug can lie dormant for a while. If you turn warnings on (via $^W or "perl -w"), and you see something like this...

    attempt to seek on unopened filehandle

...then you are probably trying to use one of these functions on an IO::ScalarArray with an old Perl. The remedy is to simply use the OO version; e.g.:

    $AH->seek(0,0);    ### GOOD: will work on any 5.005
    seek($AH,0,0);     ### WARNING: will only work on 5.005_57 and beyond

VERSION¶

$Id: ScalarArray.pm,v 1.7 2005/02/10 21:21:53 dfs Exp $

AUTHOR¶