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.