Module type Sexp_intf.S

module type S = sig .. end

type t = Type.t = 
| Atom of string
| List of t list
Type of S-expressions
type bigstring = (char, Bigarray.int8_unsigned_elt, Bigarray.c_layout) Bigarray.Array1.t 
Type of bigstrings

Defaults

val default_indent : int Pervasives.ref
default_indent reference to default indentation level for human-readable conversions. Initialisation value: 2.

S-expression size

val size : t -> int * int
size sexp
Returns (n_atoms, n_chars), where n_atoms is the number of atoms in S-expression sexp, and n_chars is the number of characters in the atoms of the S-expression.

Scan functions

val scan_sexp : ?buf:Buffer.t -> Lexing.lexbuf -> t
scan_sexp ?buf lexbuf scans an S-expression from lex buffer lexbuf using the optional string buffer buf for storing intermediate strings.
val scan_sexps : ?buf:Buffer.t -> Lexing.lexbuf -> t list
scan_sexps ?buf lexbuf reads a list of whitespace separated S-expressions from lex buffer lexbuf using the optional string buffer buf for storing intermediate strings.
val scan_rev_sexps : ?buf:Buffer.t -> Lexing.lexbuf -> t list
scan_rev_sexps ?buf lexbuf same as Sexp_intf.S.scan_sexps, but returns the reversed list and is slightly more efficient.
val scan_iter_sexps : ?buf:Buffer.t -> f:(t -> unit) -> Lexing.lexbuf -> unit
scan_iter_sexps ?buf ~f lexbuf iterates over all whitespace separated S-expressions scanned from lex buffer lexbuf using function f, and the optional string buffer buf for storing intermediate strings.
val scan_fold_sexps : ?buf:Buffer.t ->
f:('a -> t -> 'a) -> init:'a -> Lexing.lexbuf -> 'a
scan_fold_sexps ?buf ~f ~init lexbuf folds over all whitespace separated S-expressions scanned from lex buffer lexbuf using function f, initial state init, and the optional string buffer buf for storing intermediate strings.
val scan_sexps_conv : ?buf:Buffer.t -> f:(t -> 'a) -> Lexing.lexbuf -> 'a list
scan_sexps_conv ?buf ~f lexbuf maps all whitespace separated S-expressions scanned from lex buffer lexbuf to some list using function f, and the optional string buffer buf for storing intermediate strings.

Type and exception definitions for (partial) parsing

module Parse_pos: sig .. end
module Cont_state: sig .. end
type ('a, 't) parse_result = ('a, 't) Pre_sexp.parse_result = 
| Done of 't * Parse_pos.t (*Done (t, parse_pos) finished parsing an S-expression. Current parse position is parse_pos.*)
| Cont of Cont_state.t * ('a, 't) parse_fun (*Cont (cont_state, parse_fun) met the end of input before completely parsing an S-expression. The user has to call parse_fun to continue parsing the S-expression in another buffer. cont_state is the current parsing state of the continuation. NOTE: the continuation may only be called once and will raise Failure otherwise!*)
Type of result from calling Sexp.parse.
type ('a, 't) parse_fun = pos:int -> len:int -> 'a -> ('a, 't) parse_result 
Type of parsing functions with given offsets and lengths.
module Annotated: sig .. end
Module for parsing S-expressions annotated with location information
type 't parse_state = private 't Pre_sexp.parse_state = private {
   parse_pos :Parse_pos.t; (*Current parse position*)
   mutable pstack :'t; (*Stack of found S-expression lists*)
   pbuf :Buffer.t; (*Current atom buffer*)
}
Type of state maintained during parsing
type parse_error = Pre_sexp.parse_error = {
   location :string; (*Function in which the parse failed*)
   err_msg :string; (*Reason why parsing failed*)
   parse_state :[ `Annot of Annotated.stack parse_state
| `Sexp of t list list parse_state ]
;
(*State of parser*)
}
Type of parse errors
exception Parse_error of parse_error
Exception raised during partial parsing

Unannotated (partial) parsing

val parse : ?parse_pos:Parse_pos.t ->
?len:int -> string -> (string, t) parse_result
parse ?parse_pos ?len str (partially) parses an S-expression in string buffer str starting out with position information provided in parse_pos and reading at most len characters. To parse a single atom that is not delimited by whitespace it is necessary to call this function a second time with the returned continuation, and a dummy buffer that contains whitespace.
parse_pos : default = Parse_pos.create ()
len : default = String.length str - parse_pos.Parse_pos.buf_pos
val parse_bigstring : ?parse_pos:Parse_pos.t ->
?len:int ->
bigstring ->
(bigstring, t) parse_result
parse_bigstring ?parse_pos ?len str same as Sexp_intf.S.parse, but operates on bigstrings.
val input_sexp : ?parse_pos:Parse_pos.t -> Pervasives.in_channel -> t
input_sexp ?parse_pos ic parses an S-expression from input channel ic using initial position information in parse_pos. NOTE: this function is not as fast on files as Sexp.load_sexp, and is also slightly slower than the scan-functions. But it is guaranteed that input_sexp is only going to read data parseable as an S-expression. Thus, subsequent input functions will see the data immediately following it.
parse_pos : default = Parse_pos.create ()
val input_sexps : ?parse_pos:Parse_pos.t ->
?buf:string -> Pervasives.in_channel -> t list
input_sexps ?parse_pos ?buf ic parses whitespace separated S-expressions from input channel ic until EOF is reached. Faster than the scan-functions.
parse_pos : default = Parse_pos.create ()
val input_rev_sexps : ?parse_pos:Parse_pos.t ->
?buf:string -> Pervasives.in_channel -> t list
input_rev_sexps ?parse_pos ?buf ic same as Sexp.input_sexps, but returns a reversed list of S-expressions, which is slightly more efficient.

Loading of (converted) S-expressions

val load_sexp : ?strict:bool -> ?buf:string -> string -> t
load_sexp ?strict ?buf file reads one S-expression from file using buffer buf for storing intermediate data. Faster than the scan-functions.
Raises
strict : default = true
val load_sexps : ?buf:string -> string -> t list
load_sexps ?buf file reads a list of whitespace separated S-expressions from file using buffer buf for storing intermediate data. Faster than the scan-functions.
Raises
val load_rev_sexps : ?buf:string -> string -> t list
load_rev_sexps ?buf file same as Sexp.load_sexps, but returns a reversed list of S-expressions, which is slightly more efficient.
val load_sexp_conv : ?strict:bool ->
?buf:string ->
string -> (t -> 'a) -> 'a Annotated.conv
load_sexp_conv ?strict ?buf file f like Sexp.load_sexp, but performs a conversion on the fly using f. Performance is equivalent to executing Sexp.load_sexp and performing conversion when there are no errors. In contrast to the plain S-expression loader, this function not only performs the conversion, it will give exact error ranges for conversion errors.
Raises
val load_sexp_conv_exn : ?strict:bool -> ?buf:string -> string -> (t -> 'a) -> 'a
load_sexp_conv_exn ?strict ?buf file f like Sexp_intf.S.load_sexp_conv, but returns the converted value or raises Of_sexp_error with exact location information in the case of a conversion error.
val load_sexps_conv : ?buf:string ->
string -> (t -> 'a) -> 'a Annotated.conv list
load_sexps_conv ?buf file f like Sexp.load_sexps, but performs a conversion on the fly using f. Performance is equivalent to executing Sexp.load_sexps and performing conversion when there are no errors. In contrast to the plain S-expression loader, this function not only performs the conversion, it will give exact error ranges for conversion errors.
Raises
val load_sexps_conv_exn : ?buf:string -> string -> (t -> 'a) -> 'a list
load_sexps_conv_exn ?buf file f like Sexp_intf.S.load_sexps_conv, but returns the converted value or raises Of_sexp_error with exact location information in the case of a conversion error.

Output of S-expressions to I/O-channels


NOTE: for performance reasons these output functions may need to allocate large strings to write out huge S-expressions. This may cause problems on 32-bit platforms. If you think that you may need to write huge S-expressions on such platforms, you might want to use the pretty-printers that write to formatters instead (see further below).
val output_hum : Pervasives.out_channel -> t -> unit
output_hum oc sexp outputs S-expression sexp to output channel oc in human readable form.
val output_hum_indent : int -> Pervasives.out_channel -> t -> unit
output_hum_indent indent oc sexp outputs S-expression sexp to output channel oc in human readable form using indentation level indent.
val output_mach : Pervasives.out_channel -> t -> unit
output_mach oc sexp outputs S-expression sexp to output channel oc in machine readable (i.e. most compact) form.
val output : Pervasives.out_channel -> t -> unit
output oc sexp same as output_mach.

Output of S-expressions to file


All save-functions write to a temporary file before moving it into place to avoid intermittent garbling of existing files, which may cause problems for other processes that try to read.
val save_hum : ?perm:int -> string -> t -> unit
save_hum ?perm file sexp outputs S-expression sexp to file in human readable form.
perm : default = umask
val save_mach : ?perm:int -> string -> t -> unit
save_mach ?perm file sexp outputs S-expression sexp to file in machine readable (i.e. most compact) form.
perm : default = umask
val save : ?perm:int -> string -> t -> unit
save ?perm file sexp same as Sexp_intf.S.save_mach.
val save_sexps_hum : ?perm:int -> string -> t list -> unit
save_sexps_hum ?perm file sexps outputs S-expression list sexps to file in human readable form, each sexp being followed by a newline.
perm : default = umask
val save_sexps_mach : ?perm:int -> string -> t list -> unit
save_sexps_mach ?perm file sexps outputs S-expression list sexps to file in machine readable form, each sexp being followed by a newline.
perm : default = umask
val save_sexps : ?perm:int -> string -> t list -> unit
save_sexps ?perm file sexp same as Sexp_intf.S.save_sexps_mach.

Output of S-expressions to formatters

val pp_hum : Format.formatter -> t -> unit
pp_hum ppf sexp outputs S-expression sexp to formatter ppf in human readable form.
val pp_hum_indent : int -> Format.formatter -> t -> unit
pp_hum_indent n ppf sexp outputs S-expression sexp to formatter ppf in human readable form and indentation level n.
val pp_mach : Format.formatter -> t -> unit
pp_mach ppf sexp outputs S-expression sexp to formatter ppf in machine readable (i.e. most compact) form.
val pp : Format.formatter -> t -> unit
pp ppf sexp same as pp_mach.

String and bigstring conversions

module Of_string_conv_exn: sig .. end
Module encapsulating the exception raised by string converters when type conversions fail.
val of_string : string -> t
of_string str converts string str to an S-expression. NOTE: trailing whitespace is considered an error, which may be overly strict for some applications. Either strip the string of trailing whitespace first, or, even cheaper, use Sexp_intf.S.parse instead.
val of_string_conv : string -> (t -> 'a) -> 'a Annotated.conv
of_string_conv str conv like Sexp_intf.S.of_string, but performs type conversion with conv.
Returns conversion result.
val of_string_conv_exn : string -> (t -> 'a) -> 'a
of_string_conv_exn str conv like Sexp_intf.S.of_string_conv, but raises Sexp_intf.S.Of_string_conv_exn.E if type conversion fails.
Returns converted value.
val of_bigstring : bigstring -> t
of_bigstring bstr same as Sexp_intf.S.of_string, but operates on bigstrings.
val of_bigstring_conv : bigstring ->
(t -> 'a) -> 'a Annotated.conv
of_bigstring_conv bstr conv like Sexp_intf.S.of_bigstring, but performs type conversion with conv.
Returns conversion result.
val of_bigstring_conv_exn : bigstring -> (t -> 'a) -> 'a
of_bigstring_conv_exn bstr conv like Sexp_intf.S.of_bigstring_conv, but raises Sexp_intf.S.Of_string_conv_exn.E if type conversion fails.
Returns converted value.
val to_string_hum : ?indent:int -> t -> string
to_string_hum ?indent sexp converts S-expression sexp to a string in human readable form with indentation level indent.
indent : default = !default_indent
val to_string_mach : t -> string
to_string_mach sexp converts S-expression sexp to a string in machine readable (i.e. most compact) form.
val to_string : t -> string
to_string sexp same as to_string_mach.

Buffer conversions

val to_buffer_hum : buf:Buffer.t -> ?indent:int -> t -> unit
to_buffer_hum ~buf ?indent sexp outputs the S-expression sexp converted to a string in human readable form to buffer buf.
indent : default = !default_indent
val to_buffer_mach : buf:Buffer.t -> t -> unit
to_buffer_mach ~buf sexp outputs the S-expression sexp converted to a string in machine readable (i.e. most compact) form to buffer buf.
val to_buffer : buf:Buffer.t -> t -> unit
to_buffer ~buf sexp same as Sexp_intf.S.to_buffer_mach.
val to_buffer_gen : buf:'buffer ->
add_char:('buffer -> char -> unit) ->
add_string:('buffer -> string -> unit) -> t -> unit
to_buffer_gen ~buf ~add_char ~add_string sexp outputs the S-expression sexp converted to a string to buffer buf using the output functions add_char and add_string.

Utilities for automated type conversions

val unit : t
unit the unit-value as expressed by an S-expression.
val sexp_of_t : t -> t
sexp_of_t sexp maps S-expressions which are part of a type with automated S-expression conversion to themselves.
val t_of_sexp : t -> t
t_of_sexp sexp maps S-expressions which are part of a type with automated S-expression conversion to themselves.

Utilities for conversion error handling

type found = [ `Found | `Pos of int * found ] 
Type of successful search results. `Found means that an S-expression was found at the immediate position, and `Pos (pos, found) indicates that it was found at position pos within a structure (= S-expression list) where found describes recursively where it was found in that structure.
type search_result = [ `Found | `Not_found | `Pos of int * found ] 
Type of search results. `Not_found means that an S-expression was not found within another S-expression.
val search_physical : t -> contained:t -> search_result
search_physical sexp ~contained
Returns the search result indicating whether, and if, where the S-expression contained was found within S-expression sexp.
val subst_found : t -> subst:t -> found -> t
subst_found sexp ~subst found
Returns the S-expression that results from substituting subst within S-expression sexp at the location described by found.