Same as pretty-print, but v is printed like display
instead of like write.
(pretty-printv[port]) PROCEDURE
Pretty-prints the value v using the same printed form as
write, but with newlines and whitespace inserted to avoid
lines longer than (pretty-print-columns), as controlled by
(pretty-print-current-style-table). The printed form ends in
a newline unless the pretty-print-columns parameter is set
to 'infinity.
If port is provided, v is printed into port;
otherwise, v is printed to the current output port.
In addition to the parameters defined by the pretty library,
pretty-print conforms to the print-graph,
print-struct, and print-vector-length parameters.
Parameter that holds a table of style mappings. See
pretty-print-extend-style-table.
(pretty-print-columns[width]) PROCEDURE
Parameter that sets the default width for pretty printing to
width and returns void. If no width argument is
provided, the current value is returned instead.
If the display width is 'infinity, then pretty-printed
output is never broken into lines, and a newline is not added to the
end of the output.
(pretty-print-depth[depth]) PROCEDURE
Parameter that sets the default depth for recursive pretty printing to
depth and returns void. If no depth argument is
provided, the current value is returned instead. A depth of 0
indicates that only simple values are printed; Scheme values within
other values (e.g. the elements of a list) are replaced with ``...''.
Parameter that sets the procedure for displaying final strings to a
port to output pretty-printed values. The default handler is
the default port display handler (see section 11.2.5 in PLT MzScheme: Language Manual).
Parameter that determines how exact non-integers are printed. If the
parameter's value is #t, then an exact non-integer with a
decimal representation is printed as a decimal number instead of a
fraction. The initial value is #f.
Creates a new style table by extending an existing
style-table, so that the style mapping for each symbol of
like-symbol-list in the original table is used for the
corresponding symbol of symbol-list in the new table. The
symbol-list and like-symbol-list lists must have the same
length. The style-table argument can be #f, in which
case with default mappings are used for the original table (see
below).
The style mapping for a symbol controls the way that whitespace is
inserted when printing a list that starts with the symbol. In the
absence of any mapping, when a list is broken across multiple lines,
each element of the list is printed on its own line, each with the
same indentation.
The default style mapping includes mappings for the following symbols,
so that the output follows popular code-formatting rules:
Pretty-prints v if v is not void or prints nothing
otherwise. Pass this procedure to current-print to install the
pretty printer into the read-eval-print loop.
(pretty-print-print-hook[hook]) PROCEDURE
Parameter that sets the print hook for pretty-printing to hook.
If hook is not provided, the current hook is returned.
The print hook is applied to a value for printing when the sizing hook
(see pretty-print-size-hook) returns an integer size for the
value.
The print hook receives three arguments. The first argument is the
value to print. The second argument is a Boolean: #t for
printing like display and #f for printing like
write. The third argument is the destination port.
(pretty-print-print-line[liner]) PROCEDURE
Parameter that sets a procedure for printing the newline separator
between lines of a pretty-printed value. The liner procedure is
called with four arguments: a new line number, an output port, the
old line's length, and the number of destination columns. The return
value from liner is the number of extra characters it printed
at the beginning of the new line.
The liner procedure is called before any characters are printed
with 0 as the line number and 0 as the old line length;
liner is called after the last character for a value is printed
with #f as the line number and with the length of the last
line. Whenever the pretty-printer starts a new line, liner is
called with the new line's number (where the first new line is
numbered 1) and the just-finished line's length. The
destination columns argument to liner is always the total width
of the destination printing area, or 'infinity if
pretty-printed values are not broken into lines.
The default liner procedure prints a newline whenever the line
number is not 0 and the column count is not 'infinity,
always returning 0. A custom liner procedure can be used
to print extra text before each line of pretty-printed output; the
number of characters printed before each line should be returned by
liner so that the next line break can be chosen correctly.
Parameter that determines how inexact numbers are printed. If the
parameter's value is #t, then inexact numbers are always
printed with a leading #i. The initial value is #f.
(pretty-print-style-table?v) PROCEDURE
Returns #t if v is a style table,#f otherwise.
(pretty-print-post-print-hook[hook]) PROCEDURE
Parameter that sets a procedure to be called just after an object is
printed. The hook receives two arguments: the object and the output
port.
(pretty-print-pre-print-hook[hook]) PROCEDURE
Parameter that sets a procedure to be called just before an object is
printed. The hook receives two arguments: the object and the output
port.
(pretty-print-size-hook[hook]) PROCEDURE
Parameter that sets the sizing hook for pretty-printing to hook.
If hook is not provided, the current hook is returned.
The sizing hook is applied to each value to be printed. If the hook
returns #f, then printing is handled internally by the
pretty-printer. Otherwise, the value should be an integer specifying
the length of the printed value in characters; the print hook will be
called to actually print the value (see
pretty-print-print-hook).
The sizing hook receives three arguments. The first argument is the
value to print. The second argument is a Boolean: #t for
printing like display and #f for printing like
write. The third argument is the destination port. The sizing
hook may be applied to a single value multiple times during
pretty-printing.
Parameter that controls the printing of the symbol whose print name is
just a period. If set to a true value, it is printed as only the period.
If set to a false value, it is printed as a period with vertical bars
surronding it.