/usr/i686-w64-mingw32/lib/ocaml/genlex.mli is in ocaml-mingw-w64-i686 4.01.0~20140328-1.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 | (***********************************************************************)
(* *)
(* OCaml *)
(* *)
(* Xavier Leroy, projet Cristal, INRIA Rocquencourt *)
(* *)
(* Copyright 1996 Institut National de Recherche en Informatique et *)
(* en Automatique. All rights reserved. This file is distributed *)
(* under the terms of the GNU Library General Public License, with *)
(* the special exception on linking described in file ../LICENSE. *)
(* *)
(***********************************************************************)
(** A generic lexical analyzer.
This module implements a simple 'standard' lexical analyzer, presented
as a function from character streams to token streams. It implements
roughly the lexical conventions of OCaml, but is parameterized by the
set of keywords of your language.
Example: a lexer suitable for a desk calculator is obtained by
{[ let lexer = make_lexer ["+";"-";"*";"/";"let";"="; "("; ")"] ]}
The associated parser would be a function from [token stream]
to, for instance, [int], and would have rules such as:
{[
let rec parse_expr = parser
| [< n1 = parse_atom; n2 = parse_remainder n1 >] -> n2
and parse_atom = parser
| [< 'Int n >] -> n
| [< 'Kwd "("; n = parse_expr; 'Kwd ")" >] -> n
and parse_remainder n1 = parser
| [< 'Kwd "+"; n2 = parse_expr >] -> n1+n2
| [< >] -> n1
]}
One should notice that the use of the [parser] keyword and associated
notation for streams are only available through camlp4 extensions. This
means that one has to preprocess its sources {i e. g.} by using the
["-pp"] command-line switch of the compilers.
*)
(** The type of tokens. The lexical classes are: [Int] and [Float]
for integer and floating-point numbers; [String] for
string literals, enclosed in double quotes; [Char] for
character literals, enclosed in single quotes; [Ident] for
identifiers (either sequences of letters, digits, underscores
and quotes, or sequences of 'operator characters' such as
[+], [*], etc); and [Kwd] for keywords (either identifiers or
single 'special characters' such as [(], [}], etc). *)
type token =
Kwd of string
| Ident of string
| Int of int
| Float of float
| String of string
| Char of char
val make_lexer : string list -> char Stream.t -> token Stream.t
(** Construct the lexer function. The first argument is the list of
keywords. An identifier [s] is returned as [Kwd s] if [s]
belongs to this list, and as [Ident s] otherwise.
A special character [s] is returned as [Kwd s] if [s]
belongs to this list, and cause a lexical error (exception
[Stream.Error] with the offending lexeme as its parameter) otherwise.
Blanks and newlines are skipped. Comments delimited by [(*] and [*)]
are skipped as well, and can be nested. A [Stream.Failure] exception
is raised if end of stream is unexpectedly reached.*)
|