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formline function
Internal function used for formats
This is an internal function used by formats, though you may call it, too. It formats
(see the perlform manpage) 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, but you could also read $^A yourself 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 the perlform manpage for other examples.
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