210 lines
8.9 KiB
OCaml
210 lines
8.9 KiB
OCaml
(***********************************************************************)
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(* *)
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(* Objective Caml *)
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(* *)
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(* Xavier Leroy and Pierre Weis, projet Cristal, INRIA Rocquencourt *)
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(* *)
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(* Copyright 1996 Institut National de Recherche en Informatique et *)
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(* en Automatique. All rights reserved. This file is distributed *)
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(* under the terms of the GNU Library General Public License, with *)
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(* the special exception on linking described in file ../LICENSE. *)
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(* *)
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(***********************************************************************)
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(* $Id$ *)
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(** Formatted output functions. *)
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val fprintf : out_channel -> ('a, out_channel, unit) format -> 'a
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(** [fprintf outchan format arg1 ... argN] formats the arguments
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[arg1] to [argN] according to the format string [format], and
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outputs the resulting string on the channel [outchan].
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The format is a character string which contains two types of
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objects: plain characters, which are simply copied to the output
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channel, and conversion specifications, each of which causes
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conversion and printing of arguments.
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Conversion specifications have the following form:
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[% \[flags\] \[width\] \[.precision\] type]
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In short, a conversion specification consists in the [%] character,
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followed by optional modifiers and a type which is made of one or
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two characters. The types and their meanings are:
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- [d], [i], [n], [l], [L], or [N]: convert an integer argument to
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signed decimal.
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- [u]: convert an integer argument to unsigned decimal.
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- [x]: convert an integer argument to unsigned hexadecimal,
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using lowercase letters.
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- [X]: convert an integer argument to unsigned hexadecimal,
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using uppercase letters.
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- [o]: convert an integer argument to unsigned octal.
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- [s]: insert a string argument.
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- [S]: insert a string argument in Caml syntax (double quotes, escapes).
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- [c]: insert a character argument.
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- [C]: insert a character argument in Caml syntax (single quotes, escapes).
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- [f]: convert a floating-point argument to decimal notation,
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in the style [dddd.ddd].
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- [F]: convert a floating-point argument to Caml syntax ([dddd.]
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or [dddd.ddd] or [d.ddd e+-dd]).
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- [e] or [E]: convert a floating-point argument to decimal notation,
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in the style [d.ddd e+-dd] (mantissa and exponent).
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- [g] or [G]: convert a floating-point argument to decimal notation,
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in style [f] or [e], [E] (whichever is more compact).
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- [B]: convert a boolean argument to the string [true] or [false]
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- [b]: convert a boolean argument (for backward compatibility; do not
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use in new programs).
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- [ld], [li], [lu], [lx], [lX], [lo]: convert an [int32] argument to
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the format specified by the second letter (decimal, hexadecimal, etc).
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- [nd], [ni], [nu], [nx], [nX], [no]: convert a [nativeint] argument to
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the format specified by the second letter.
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- [Ld], [Li], [Lu], [Lx], [LX], [Lo]: convert an [int64] argument to
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the format specified by the second letter.
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- [a]: user-defined printer. Takes two arguments and applies the
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first one to [outchan] (the current output channel) and to the
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second argument. The first argument must therefore have type
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[out_channel -> 'b -> unit] and the second ['b].
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The output produced by the function is inserted in the output of
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[fprintf] at the current point.
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- [t]: same as [%a], but takes only one argument (with type
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[out_channel -> unit]) and apply it to [outchan].
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- [\{ fmt %\}]: convert a format string argument. The argument must
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have the same type as the internal format string [fmt].
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- [( fmt %)]: format string substitution. Takes a format string
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argument and substitutes it to the internal format string [fmt]
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to print following arguments. The argument must have the same
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type as [fmt].
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- [!]: take no argument and flush the output.
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- [%]: take no argument and output one [%] character.
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The optional [flags] are:
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- [-]: left-justify the output (default is right justification).
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- [0]: for numerical conversions, pad with zeroes instead of spaces.
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- [+]: for numerical conversions, prefix number with a [+] sign if positive.
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- space: for numerical conversions, prefix number with a space if positive.
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- [#]: request an alternate formatting style for numbers.
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The optional [width] is an integer indicating the minimal
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width of the result. For instance, [%6d] prints an integer,
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prefixing it with spaces to fill at least 6 characters.
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The optional [precision] is a dot [.] followed by an integer
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indicating how many digits follow the decimal point in the [%f],
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[%e], and [%E] conversions. For instance, [%.4f] prints a [float] with
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4 fractional digits.
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The integer in a [width] or [precision] can also be specified as
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[*], in which case an extra integer argument is taken to specify
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the corresponding [width] or [precision]. This integer argument
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precedes immediately the argument to print.
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For instance, [%.*f] prints a [float] with as many fractional
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digits as the value of the argument given before the float. *)
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val printf : ('a, out_channel, unit) format -> 'a
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(** Same as {!Printf.fprintf}, but output on [stdout]. *)
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val eprintf : ('a, out_channel, unit) format -> 'a
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(** Same as {!Printf.fprintf}, but output on [stderr]. *)
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val ifprintf : 'a -> ('b, 'a, unit) format -> 'b
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(** Same as {!Printf.fprintf}, but does not print anything.
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Useful to ignore some material when conditionally printing. *)
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val sprintf : ('a, unit, string) format -> 'a
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(** Same as {!Printf.fprintf}, but instead of printing on an output channel,
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return a string containing the result of formatting the arguments. *)
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val bprintf : Buffer.t -> ('a, Buffer.t, unit) format -> 'a
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(** Same as {!Printf.fprintf}, but instead of printing on an output channel,
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append the formatted arguments to the given extensible buffer
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(see module {!Buffer}). *)
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(** Formatted output functions with continuations. *)
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val kfprintf : (out_channel -> 'a) -> out_channel ->
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('b, out_channel, unit, 'a) format4 -> 'b;;
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(** Same as [fprintf], but instead of returning immediately,
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passes the out channel to its first argument at the end of printing. *)
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val ksprintf : (string -> 'a) -> ('b, unit, string, 'a) format4 -> 'b;;
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(** Same as [sprintf] above, but instead of returning the string,
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passes it to the first argument. *)
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val kbprintf : (Buffer.t -> 'a) -> Buffer.t ->
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('b, Buffer.t, unit, 'a) format4 -> 'b;;
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(** Same as [bprintf], but instead of returning immediately,
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passes the buffer to its first argument at the end of printing. *)
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val kprintf : (string -> 'a) -> ('b, unit, string, 'a) format4 -> 'b;;
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(** A deprecated synonym for [ksprintf]. *)
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(**/**)
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(* For system use only. Don't call directly. *)
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module CamlinternalPr : sig
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module Sformat : sig
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type index;;
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val index_of_int : int -> index;;
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external int_of_index : index -> int = "%identity";;
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external unsafe_index_of_int : int -> index = "%identity";;
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val succ_index : index -> index;;
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val sub : ('a, 'b, 'c, 'd, 'e, 'f) format6 -> index -> int -> string;;
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val to_string : ('a, 'b, 'c, 'd, 'e, 'f) format6 -> string;;
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external length : ('a, 'b, 'c, 'd, 'e, 'f) format6 -> int
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= "%string_length";;
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external get : ('a, 'b, 'c, 'd, 'e, 'f) format6 -> int -> char
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= "%string_safe_get";;
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external unsafe_to_string : ('a, 'b, 'c, 'd, 'e, 'f) format6 -> string
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= "%identity";;
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external unsafe_get : ('a, 'b, 'c, 'd, 'e, 'f) format6 -> int -> char
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= "%string_unsafe_get";;
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end;;
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module Tformat : sig
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type ac = {
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mutable ac_rglr : int;
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mutable ac_skip : int;
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mutable ac_rdrs : int;
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};;
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val ac_of_format : ('a, 'b, 'c, 'd, 'e, 'f) format6 -> ac;;
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val sub_format :
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(('a, 'b, 'c, 'd, 'e, 'f) format6 -> int) ->
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(('a, 'b, 'c, 'd, 'e, 'f) format6 -> int -> char -> int) ->
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char ->
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('a, 'b, 'c, 'd, 'e, 'f) format6 ->
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int ->
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int
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val summarize_format_type : ('a, 'b, 'c, 'd, 'e, 'f) format6 -> string
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val scan_format : ('a, 'b, 'c, 'd, 'e, 'f) format6 ->
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'g array ->
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Sformat.index ->
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int ->
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(Sformat.index -> string -> int -> 'h) ->
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(Sformat.index -> 'i -> 'j -> int -> 'h) ->
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(Sformat.index -> 'k -> int -> 'h) ->
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(Sformat.index -> int -> 'h) ->
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(Sformat.index -> ('l, 'm, 'n, 'o, 'p, 'q) format6 -> int -> 'h) ->
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'h
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val kapr :
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(('a, 'b, 'c, 'd, 'e, 'f) format6 -> Obj.t array -> 'g) ->
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('a, 'b, 'c, 'd, 'e, 'f) format6 ->
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'g
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end;;
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end;;
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