1 (* Copyright (C) 2000, HELM Team.
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4 * Library of Mathematics, developed at the Computer Science
5 * Department, University of Bologna, Italy.
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28 (* This module implements the Query interface to the Coercion Graph *)
30 type coercion_search_result =
31 (* metasenv, last coercion argument, fully saturated coercion *)
32 (* to apply the coercion it is sufficient to unify the last coercion
33 argument (that is a Meta) with the term to be coerced *)
34 | SomeCoercion of (Cic.metasenv * Cic.term * Cic.term) list
37 | NotHandled of string Lazy.t
39 val look_for_coercion :
40 Cic.metasenv -> Cic.substitution -> Cic.context ->
41 Cic.term -> Cic.term -> coercion_search_result
43 val look_for_coercion' :
44 Cic.metasenv -> Cic.substitution -> Cic.context ->
45 CoercDb.coerc_carr -> CoercDb.coerc_carr -> coercion_search_result
47 (* checks if term is a constant or
48 * a constant applyed that is marked with (`Class `Coercion) *)
49 val is_composite: Cic.term -> bool
51 val source_of: Cic.term -> Cic.term
53 val generate_dot_file: unit -> string
55 (* given the Appl contents returns the argument of the head coercion *)
56 val coerced_arg: Cic.term list -> Cic.term option
58 (* returns: (carr,menv,(saturated coercion,last arg)option,idem) list *)
60 Cic.metasenv -> Cic.substitution -> Cic.context ->
61 CoercDb.coerc_carr -> CoercDb.coerc_carr ->
62 (CoercDb.coerc_carr * Cic.metasenv *
63 (Cic.term * Cic.term) option * (Cic.term * Cic.term) option) list