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formline

Perl 5 version 8.9 documentation
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formline

  • formline PICTURE,LIST

    This is an internal function used by formats, though you may call it, too. It formats (see perlform) a list of values according to the contents of PICTURE, placing the output into the format output accumulator, $^A (or $ACCUMULATOR in English). Eventually, when a write is done, the contents of $^A are written to some filehandle. You could also read $^A and then set $^A back to "" . Note that a format typically does one formline per line of form, but the formline function itself doesn't care how many newlines are embedded in the PICTURE. This means that the ~ and ~~ tokens will treat the entire PICTURE as a single line. You may therefore need to use multiple formlines to implement a single record format, just like the format compiler.

    Be careful if you put double quotes around the picture, because an @ character may be taken to mean the beginning of an array name. formline always returns true. See perlform for other examples.