1 (* Copyright (C) 2000, HELM Team.
3 * This file is part of HELM, an Hypertextual, Electronic
4 * Library of Mathematics, developed at the Computer Science
5 * Department, University of Bologna, Italy.
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27 * implementazione del comando DIFF
30 exception NotCompatible;;
32 (* intersect_attributes is successful iff there is no attribute with *)
33 (* two different values in the two lists. The returned list is the *)
34 (* union of the two lists. *)
35 let rec intersect_attributes (attr1, attr2) =
36 match attr1, attr2 with
39 | (key1,value1)::tl1, (key2,_)::_ when key1 < key2 ->
40 (key1,value1)::(intersect_attributes (tl1,attr2))
41 | (key1,_)::_, (key2,value2)::tl2 when key2 < key1 ->
42 (key2,value2)::(intersect_attributes (attr1,tl2))
43 | entry1::tl1, entry2::tl2 when entry1 = entry2 ->
44 entry1::(intersect_attributes (tl1,tl2))
45 | _, _ -> raise NotCompatible (* same keys, different values *)
49 * implementazione del comando DIFF
51 let rec diff_ex l1 l2 =
52 let module S = Mathql_semantics in
56 | {S.uri = uri1}::_, {S.uri = uri2}::tl2 when uri2 < uri1 ->
58 | {S.uri = uri1 ; S.attributes = attributes1}::tl1,
59 {S.uri = uri2}::_ when uri1 < uri2 ->
60 {S.uri = uri1 ; S.attributes = attributes1 ; S.extra = ""}::(diff_ex tl1 l2)
61 | {S.uri = uri1 ; S.attributes = attributes1}::tl1,
62 {S.uri = uri2 ; S.attributes = attributes2}::tl2 ->
64 let attributes' = intersect_attributes (attributes1, attributes2) in
68 {S.uri = uri1 ; S.attributes = attributes1 ; S.extra = ""}::(diff_ex tl1 tl2)
72 let before = Unix.time () in
73 let res = diff_ex l1 l2 in
74 let after = Unix.time () in
75 let ll1 = string_of_int (List.length l1) in
76 let ll2 = string_of_int (List.length l2) in
77 let diff = string_of_float (after -. before) in
79 ("DIFF(" ^ ll1 ^ ", " ^ ll2 ^ ") = " ^ string_of_int (List.length res) ^