37 lines
937 B
OCaml
37 lines
937 B
OCaml
(* camlp4r *)
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(* $Id$ *)
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(** Extensible functions.
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This module implements pattern matching extensible functions.
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To extend, use syntax [pa_extfun.cmo]:
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[extfun e with [ pattern_matching ]] *)
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type t 'a 'b = 'x;
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(** The type of the extensible functions of type ['a -> 'b] *)
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value empty : t 'a 'b;
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(** Empty extensible function *)
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value apply : t 'a 'b -> 'a -> 'b;
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(** Apply an extensible function *)
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exception Failure;
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(** Match failure while applying an extensible function *)
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value print : t 'a 'b -> unit;
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(** Print patterns in the order they are recorded *)
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(**/**)
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type matching 'a 'b = { patt : patt; has_when : bool; expr : expr 'a 'b }
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and patt =
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[ Eapp of list patt
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| Eacc of list patt
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| Econ of string
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| Estr of string
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| Eint of string
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| Etup of list patt
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| Evar of unit ]
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and expr 'a 'b = 'a -> option 'b
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;
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value extend : t 'a 'b -> list (patt * bool * expr 'a 'b) -> t 'a 'b;
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