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Programming Perl

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3.2.42 formline

formline PICTURE, LIST

This is an internal function used by formats, although you may also call it. It formats a list of values according to the contents of PICTURE, placing the output into the format output accumulator, $^A. 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, since an @ character may be taken to mean the beginning of an array name. formline always returns true. See "Formats" in Chapter 2 for other examples.


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