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ocaml/typing/printpat.mli

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parmatch: split pretty printing out into Printpat
2017-07-07 03:02:37 -07:00
(**************************************************************************)
(* *)
(* 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 Lesser General Public License version 2.1, with the *)
(* special exception on linking described in the file LICENSE. *)
(* *)
(**************************************************************************)
split patterns into "value patterns" and "computation patterns" Value patterns match on a value (the result of computation), while computation patterns handle the effects (hint hint) of a computation. The only forms of computation patterns in OCaml today are value patterns and exception patterns (exception p). The sub-pattern `p` of the `lazy p` construction should be a computation pattern, rather than a value pattern. This pull-request does not make this change. Most of the changes in this PR are boilerplate -- it really is a lot of work now to add a new syntactic category to the typed-tree syntax. This boilerplate is fairly automatic and should be easy to review. There is a subtle part to the patch, though: the implementation of the pattern type-checking. It now has to reconstruct the value/computation distinction (absent from the parse-tree), and return values from two different types. Instead of splitting the type-checker in several functions (which risked code duplications), I choose to use a GADT to have the same [type_pat] function return two different types depending on the caller. This is the least invasive way to adapt this part of the codebase, whose inherent complexity is so large (unfortunately) that adding a GADT to the mix barely makes a difference.
2019-09-20 06:23:07 -07:00
val pretty_const
: Asttypes.constant -> string
val top_pretty
: Format.formatter -> 'k Typedtree.general_pattern -> unit
val pretty_pat
: 'k Typedtree.general_pattern -> unit
val pretty_line
: Format.formatter -> 'k Typedtree.general_pattern list -> unit
val pretty_matrix
: Format.formatter -> 'k Typedtree.general_pattern list list -> unit