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-
-@menu
-* Format Interface::            
-* Format Specification::        
-@end menu
-
-@node Format Interface, Format Specification, Format, Format
-@subsection Format Interface
-
-@defun format destination format-string . arguments
-An almost complete implementation of Common LISP format description
-according to the CL reference book @cite{Common LISP} from Guy L.
-Steele, Digital Press.  Backward compatible to most of the available
-Scheme format implementations.
-
-Returns @code{#t}, @code{#f} or a string; has side effect of printing
-according to @var{format-string}.  If @var{destination} is @code{#t},
-the output is to the current output port and @code{#t} is returned.  If
-@var{destination} is @code{#f}, a formatted string is returned as the
-result of the call.  NEW: If @var{destination} is a string,
-@var{destination} is regarded as the format string; @var{format-string} is
-then the first argument and the output is returned as a string. If
-@var{destination} is a number, the output is to the current error port
-if available by the implementation. Otherwise @var{destination} must be
-an output port and @code{#t} is returned.@refill
-
-@var{format-string} must be a string.  In case of a formatting error
-format returns @code{#f} and prints a message on the current output or
-error port.  Characters are output as if the string were output by the
-@code{display} function with the exception of those prefixed by a tilde
-(~).  For a detailed description of the @var{format-string} syntax
-please consult a Common LISP format reference manual.  For a test suite
-to verify this format implementation load @file{formatst.scm}. Please
-send bug reports to @code{lutzeb@@cs.tu-berlin.de}.
-
-Note: @code{format} is not reentrant, i.e. only one @code{format}-call
-may be executed at a time.
-
-@end defun
-
-@node Format Specification,  , Format Interface, Format
-@subsection Format Specification (Format version 3.0)
-
-Please consult a Common LISP format reference manual for a detailed
-description of the format string syntax.  For a demonstration of the
-implemented directives see @file{formatst.scm}.@refill
-
-This implementation supports directive parameters and modifiers
-(@code{:} and @code{@@} characters). Multiple parameters must be
-separated by a comma (@code{,}).  Parameters can be numerical parameters
-(positive or negative), character parameters (prefixed by a quote
-character (@code{'}), variable parameters (@code{v}), number of rest
-arguments parameter (@code{#}), empty and default parameters.  Directive
-characters are case independent. The general form of a directive
-is:@refill
-
-@noindent
-@var{directive} ::= ~@{@var{directive-parameter},@}[:][@@]@var{directive-character}
-
-@noindent
-@var{directive-parameter} ::= [ [-|+]@{0-9@}+ | '@var{character} | v | # ]
-
-
-@subsubsection Implemented CL Format Control Directives
-
-Documentation syntax: Uppercase characters represent the corresponding
-control directive characters. Lowercase characters represent control
-directive parameter descriptions.
-
-@table @asis
-@item @code{~A}
-Any (print as @code{display} does).
-@table @asis
-@item @code{~@@A}
-left pad.
-@item @code{~@var{mincol},@var{colinc},@var{minpad},@var{padchar}A}
-full padding.
-@end table
-@item @code{~S}
-S-expression (print as @code{write} does).
-@table @asis
-@item @code{~@@S}
-left pad.
-@item @code{~@var{mincol},@var{colinc},@var{minpad},@var{padchar}S}
-full padding.
-@end table
-@item @code{~D}
-Decimal.
-@table @asis
-@item @code{~@@D}
-print number sign always.
-@item @code{~:D}
-print comma separated.
-@item @code{~@var{mincol},@var{padchar},@var{commachar}D}
-padding.
-@end table
-@item @code{~X}
-Hexadecimal.
-@table @asis
-@item @code{~@@X}
-print number sign always.
-@item @code{~:X}
-print comma separated.
-@item @code{~@var{mincol},@var{padchar},@var{commachar}X}
-padding.
-@end table
-@item @code{~O}
-Octal.
-@table @asis
-@item @code{~@@O}
-print number sign always.
-@item @code{~:O}
-print comma separated.
-@item @code{~@var{mincol},@var{padchar},@var{commachar}O}
-padding.
-@end table
-@item @code{~B}
-Binary.
-@table @asis
-@item @code{~@@B}
-print number sign always.
-@item @code{~:B}
-print comma separated.
-@item @code{~@var{mincol},@var{padchar},@var{commachar}B}
-padding.
-@end table
-@item @code{~@var{n}R}
-Radix @var{n}.
-@table @asis
-@item @code{~@var{n},@var{mincol},@var{padchar},@var{commachar}R}
-padding.
-@end table
-@item @code{~@@R}
-print a number as a Roman numeral.
-@item @code{~:@@R}
-print a number as an ``old fashioned'' Roman numeral.
-@item @code{~:R}
-print a number as an ordinal English number.
-@item @code{~R}
-print a number as a cardinal English number.
-@item @code{~P}
-Plural.
-@table @asis
-@item @code{~@@P}
-prints @code{y} and @code{ies}.
-@item @code{~:P}
-as @code{~P but jumps 1 argument backward.}
-@item @code{~:@@P}
-as @code{~@@P but jumps 1 argument backward.}
-@end table
-@item @code{~C}
-Character.
-@table @asis
-@item @code{~@@C}
-prints a character as the reader can understand it (i.e. @code{#\} prefixing).
-@item @code{~:C}
-prints a character as emacs does (eg. @code{^C} for ASCII 03).
-@end table
-@item @code{~F}
-Fixed-format floating-point (prints a flonum like @var{mmm.nnn}).
-@table @asis
-@item @code{~@var{width},@var{digits},@var{scale},@var{overflowchar},@var{padchar}F}
-@item @code{~@@F}
-If the number is positive a plus sign is printed.
-@end table
-@item @code{~E}
-Exponential floating-point (prints a flonum like @var{mmm.nnn}@code{E}@var{ee}).
-@table @asis
-@item @code{~@var{width},@var{digits},@var{exponentdigits},@var{scale},@var{overflowchar},@var{padchar},@var{exponentchar}E}
-@item @code{~@@E}
-If the number is positive a plus sign is printed.
-@end table
-@item @code{~G}
-General floating-point (prints a flonum either fixed or exponential).
-@table @asis
-@item @code{~@var{width},@var{digits},@var{exponentdigits},@var{scale},@var{overflowchar},@var{padchar},@var{exponentchar}G}
-@item @code{~@@G}
-If the number is positive a plus sign is printed.
-@end table
-@item @code{~$}
-Dollars floating-point (prints a flonum in fixed with signs separated).
-@table @asis
-@item @code{~@var{digits},@var{scale},@var{width},@var{padchar}$}
-@item @code{~@@$}
-If the number is positive a plus sign is printed.
-@item @code{~:@@$}
-A sign is always printed and appears before the padding.
-@item @code{~:$}
-The sign appears before the padding.
-@end table
-@item @code{~%}
-Newline.
-@table @asis
-@item @code{~@var{n}%}
-print @var{n} newlines.
-@end table
-@item @code{~&}
-print newline if not at the beginning of the output line.
-@table @asis
-@item @code{~@var{n}&}
-prints @code{~&} and then @var{n-1} newlines.
-@end table
-@item @code{~|}
-Page Separator.
-@table @asis
-@item @code{~@var{n}|}
-print @var{n} page separators.
-@end table
-@item @code{~~}
-Tilde.
-@table @asis
-@item @code{~@var{n}~}
-print @var{n} tildes.
-@end table
-@item @code{~}<newline>
-Continuation Line.
-@table @asis
-@item @code{~:}<newline>
-newline is ignored, white space left.
-@item @code{~@@}<newline>
-newline is left, white space ignored.
-@end table
-@item @code{~T}
-Tabulation.
-@table @asis
-@item @code{~@@T}
-relative tabulation.
-@item @code{~@var{colnum,colinc}T}
-full tabulation.
-@end table
-@item @code{~?}
-Indirection (expects indirect arguments as a list).
-@table @asis
-@item @code{~@@?}
-extracts indirect arguments from format arguments.
-@end table
-@item @code{~(@var{str}~)}
-Case conversion (converts by @code{string-downcase}).
-@table @asis
-@item @code{~:(@var{str}~)}
-converts by @code{string-capitalize}.
-@item @code{~@@(@var{str}~)}
-converts by @code{string-capitalize-first}.
-@item @code{~:@@(@var{str}~)}
-converts by @code{string-upcase}.
-@end table
-@item @code{~*}
-Argument Jumping (jumps 1 argument forward).
-@table @asis
-@item @code{~@var{n}*}
-jumps @var{n} arguments forward.
-@item @code{~:*}
-jumps 1 argument backward.
-@item @code{~@var{n}:*}
-jumps @var{n} arguments backward.
-@item @code{~@@*}
-jumps to the 0th argument.
-@item @code{~@var{n}@@*}
-jumps to the @var{n}th argument (beginning from 0)
-@end table
-@item @code{~[@var{str0}~;@var{str1}~;...~;@var{strn}~]}
-Conditional Expression (numerical clause conditional).
-@table @asis
-@item @code{~@var{n}[}
-take argument from @var{n}.
-@item @code{~@@[}
-true test conditional.
-@item @code{~:[}
-if-else-then conditional.
-@item @code{~;}
-clause separator.
-@item @code{~:;}
-default clause follows.
-@end table
-@item @code{~@{@var{str}~@}}
-Iteration (args come from the next argument (a list)).
-@table @asis
-@item @code{~@var{n}@{}
-at most @var{n} iterations.
-@item @code{~:@{}
-args from next arg (a list of lists).
-@item @code{~@@@{}
-args from the rest of arguments.
-@item @code{~:@@@{}
-args from the rest args (lists).
-@end table
-@item @code{~^}
-Up and out.
-@table @asis
-@item @code{~@var{n}^}
-aborts if @var{n} = 0
-@item @code{~@var{n},@var{m}^}
-aborts if @var{n} = @var{m}
-@item @code{~@var{n},@var{m},@var{k}^}
-aborts if @var{n} <= @var{m} <= @var{k}
-@end table
-@end table
-
-
-@subsubsection Not Implemented CL Format Control Directives
-
-@table @asis
-@item @code{~:A}
-print @code{#f} as an empty list (see below).
-@item @code{~:S}
-print @code{#f} as an empty list (see below).
-@item @code{~<~>}
-Justification.
-@item @code{~:^}
-(sorry I don't understand its semantics completely)
-@end table
-
-
-@subsubsection Extended, Replaced and Additional Control Directives
-
-@table @asis
-@item @code{~@var{mincol},@var{padchar},@var{commachar},@var{commawidth}D}
-@item @code{~@var{mincol},@var{padchar},@var{commachar},@var{commawidth}X}
-@item @code{~@var{mincol},@var{padchar},@var{commachar},@var{commawidth}O}
-@item @code{~@var{mincol},@var{padchar},@var{commachar},@var{commawidth}B}
-@item @code{~@var{n},@var{mincol},@var{padchar},@var{commachar},@var{commawidth}R}
-@var{commawidth} is the number of characters between two comma characters.
-@end table
-
-@table @asis
-@item @code{~I}
-print a R4RS complex number as @code{~F~@@Fi} with passed parameters for
-@code{~F}.
-@item @code{~Y}
-Pretty print formatting of an argument for scheme code lists.
-@item @code{~K}
-Same as @code{~?.}
-@item @code{~!}
-Flushes the output if format @var{destination} is a port.
-@item @code{~_}
-Print a @code{#\space} character
-@table @asis
-@item @code{~@var{n}_}
-print @var{n} @code{#\space} characters.
-@end table
-@item @code{~/}
-Print a @code{#\tab} character
-@table @asis
-@item @code{~@var{n}/}
-print @var{n} @code{#\tab} characters.
-@end table
-@item @code{~@var{n}C}
-Takes @var{n} as an integer representation for a character. No arguments
-are consumed. @var{n} is converted to a character by
-@code{integer->char}.  @var{n} must be a positive decimal number.@refill
-@item @code{~:S}
-Print out readproof.  Prints out internal objects represented as
-@code{#<...>} as strings @code{"#<...>"} so that the format output can always
-be processed by @code{read}.
-@refill
-@item @code{~:A}
-Print out readproof.  Prints out internal objects represented as
-@code{#<...>} as strings @code{"#<...>"} so that the format output can always
-be processed by @code{read}.
-@item @code{~Q}
-Prints information and a copyright notice on the format implementation.
-@table @asis
-@item @code{~:Q}
-prints format version.
-@end table
-@refill
-@item @code{~F, ~E, ~G, ~$}
-may also print number strings, i.e. passing a number as a string and
-format it accordingly.
-@end table
-
-@subsubsection Configuration Variables
-
-Format has some configuration variables at the beginning of
-@file{format.scm} to suit the systems and users needs. There should be
-no modification necessary for the configuration that comes with SLIB.
-If modification is desired the variable should be set after the format
-code is loaded. Format detects automatically if the running scheme
-system implements floating point numbers and complex numbers.
-
-@table @asis
-
-@item @var{format:symbol-case-conv}
-Symbols are converted by @code{symbol->string} so the case type of the
-printed symbols is implementation dependent.
-@code{format:symbol-case-conv} is a one arg closure which is either
-@code{#f} (no conversion), @code{string-upcase}, @code{string-downcase}
-or @code{string-capitalize}. (default @code{#f})
-
-@item @var{format:iobj-case-conv}
-As @var{format:symbol-case-conv} but applies for the representation of
-implementation internal objects. (default @code{#f})
-
-@item @var{format:expch}
-The character prefixing the exponent value in @code{~E} printing. (default
-@code{#\E})
-
-@end table
-
-@subsubsection Compatibility With Other Format Implementations
-
-@table @asis
-@item SLIB format 2.x:
-See @file{format.doc}.
-
-@item SLIB format 1.4:
-Downward compatible except for padding support and @code{~A}, @code{~S},
-@code{~P}, @code{~X} uppercase printing.  SLIB format 1.4 uses C-style
-@code{printf} padding support which is completely replaced by the CL
-@code{format} padding style.
-
-@item MIT C-Scheme 7.1:
-Downward compatible except for @code{~}, which is not documented
-(ignores all characters inside the format string up to a newline
-character).  (7.1 implements @code{~a}, @code{~s},
-~@var{newline}, @code{~~}, @code{~%}, numerical and variable
-parameters and @code{:/@@} modifiers in the CL sense).@refill
-
-@item Elk 1.5/2.0:
-Downward compatible except for @code{~A} and @code{~S} which print in
-uppercase.  (Elk implements @code{~a}, @code{~s}, @code{~~}, and
-@code{~%} (no directive parameters or modifiers)).@refill
-
-@item Scheme->C 01nov91:
-Downward compatible except for an optional destination parameter: S2C
-accepts a format call without a destination which returns a formatted
-string. This is equivalent to a #f destination in S2C. (S2C implements
-@code{~a}, @code{~s}, @code{~c}, @code{~%}, and @code{~~} (no directive
-parameters or modifiers)).@refill
-
-@end table
-
-This implementation of format is solely useful in the SLIB context
-because it requires other components provided by SLIB.@refill