package mopsa

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package mopsa
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type t

Represents a relation between a domain and a codomain. An element of t can be seen as a set of bindings, i.e., a subset of dom * codom, or as a function from dom to subsets of codom (i.e., a multi-map). Relations are imutable, purely functional data-structures.

Internally, the relation is represented as a map to sets. As a consequence, it is easy to get the post-image of an element of the domain, but hard to get the pre-image of an element of the codomain (use InvRelation if this is needed). We use Maps and Sets, so that it is required to provide OrderedType structures for the domain and codomain.

type dom

An element of the domain.

type codom

An element of the codomain.

Data-type for sets of codomain elements.

type codom_set = CoDomSet.t

A set of elements of the codomain.

type binding = dom * codom

A binding.

Construction and update

val empty : t

The empty relation.

val image : dom -> t -> codom_set

image x r is the set of elements associated to x in r (possibly the empty set).

val set_image : dom -> codom_set -> t -> t

set_image x ys r is a new relation where the image of x has been updated to be ys.

val is_image_empty : dom -> t -> bool

is_image_empty x r returns true if there is no element associated to x in r.

val is_empty : t -> bool

Whether the relation is empty.

val singleton : dom -> codom -> t

singleton x y is the relation with a unique binding (x,y).

val add : dom -> codom -> t -> t

add x y r returns r with a new binding (x,y) added. Previous bindings to x are preserved.

val add_set : dom -> codom_set -> t -> t

add_set x ys r returns r with all the bindings (x,y) for y in the set ys added. Previous bindings to x are preserved.

val remove : dom -> codom -> t -> t

remove x y r returns r with the binding (x,y) removed, if it exists. Other bindings to x are preserved.

val remove_set : dom -> codom_set -> t -> t

remove_set x ys r returns r with a all bindings (x,y) for y in the set ys removed. Other bindings to x are preserved.

val remove_image : dom -> t -> t

remove_image x r returns r with all bindings to x removed.

val mem : dom -> codom -> t -> bool

mem x y r returns true if the binding (x,y) is present in r.

val of_list : binding list -> t

of_list l returns a relation constructed from the list of bindings.

val bindings : t -> binding list

bindings r lists the bindings in the relation.

val min_binding : t -> binding

min_binding r returns the smallest binding in r, for the lexicographic order of domain and codomain. Raises Not_found if the relation is empty.

val max_binding : t -> binding

max_binding r returns the largest binding in r, for the lexicographic order of domain and codomain. Raises Not_found if the relation is empty.

val choose : t -> binding

choose r returns an arbitrary binding in r. Raises Not_found if the relation is empty.

val cardinal : t -> int

cardinal r returns the number of bindings in r.

Global operations

val iter : (dom -> codom -> unit) -> t -> unit

iter f r applies f x y to every binding (x,y) of r. The bindings are considered in increasing order for the lexicographic order sorting through dom first, and then codom.

val fold : (dom -> codom -> 'a -> 'a) -> t -> 'a -> 'a

fold f r acc folds acc through every binding (x,y) in r through f. The bindings are considered in increasing order for the lexicographic order sorting through dom first, and then codom.

val map : (dom -> codom -> binding) -> t -> t

map f r returns a relation where every binding (x,y) is replaced with (x',y')=f x y. The bindings are considered in increasing order for the lexicographic order sorting through dom first, and then codom.

val domain_map : (dom -> dom) -> t -> t

domain_map f r returns a relation where every binding (x,y) is replaced with (f x,y). The bindings are considered in increasing order for the lexicographic order sorting through dom first, and then codom.

val codomain_map : (codom -> codom) -> t -> t

codomain_map f r returns a relation where every binding (x,y) is replaced with (x,f y). The bindings are considered in increasing order for the lexicographic order sorting through dom first, and then codom.

val for_all : (dom -> codom -> bool) -> t -> bool

for_all f r returns true if f x y is true for every binding (x,y) in r. The bindings are considered in increasing order for the lexicographic order sorting through dom first, and then codom.

val exists : (dom -> codom -> bool) -> t -> bool

exists f r returns true if f x y is true for at leat one binding (x,y) in r. The bindings are considered in increasing order for the lexicographic order sorting through dom first, and then codom.

val filter : (dom -> codom -> bool) -> t -> t

filter f r returns a relation with only the bindings (x,y) from r where f x y is true.

val map_slice : (dom -> codom -> codom) -> t -> dom -> dom -> t

map_slice f r k1 k2 only applies f to bindings with domain greater or equal to k1 and smaller or equal to k2 to constructed relation is returned. Bindings with domain outside this range in r are put unchanged in the result.

val iter_slice : (dom -> codom -> unit) -> t -> dom -> dom -> unit

iter_slice f r k1 k2 is similar to iter f r, but only calls f on bindings with domain greater or equal to k1 and smaller or equal to k2.

val fold_slice : (dom -> codom -> 'a -> 'a) -> t -> dom -> dom -> 'a -> 'a

fold_slice f r k1 k2 a is similar to fold f r, but only calls f on bindings with domain greater or equal to k1 and smaller or equal to k2.

val for_all_slice : (dom -> codom -> bool) -> t -> dom -> dom -> bool

for_all_slice f r k1 k2 a is similar to for_all f r, but only calls f on bindings with domain greater or equal to k1 and smaller or equal to k2. It is as if, outside this range, f k a = true and has no effect.

val exists_slice : (dom -> codom -> bool) -> t -> dom -> dom -> bool

exists_slice f r k1 k2 a is similar to exists f r, but only calls f on bindings with domain greater or equal to k1 and smaller or equal to k2. It is as if, outside this range, f k a = false and has no effect.

Set operations

val compare : t -> t -> int

Total ordering function that returns -1, 0 or 1.

val equal : t -> t -> bool

Whether the two relations have the exact same set of bindings.

val subset : t -> t -> bool

subset r1 r2 returns whether the set of bindings in s1 is included in the set of bindings in s2.

val union : t -> t -> t

union r s is the union of the bindings of r and s.

val inter : t -> t -> t

inter r s is the intersection of the bindings of r and s.

val diff : t -> t -> t

diff r s is the set difference of the bindings of r and s.

Binary operations

val iter2 : (dom -> codom -> unit) -> (dom -> codom -> unit) -> (dom -> codom -> unit) -> t -> t -> unit

iter2 f1 f2 f r1 r2 applies f1 to the bindings only in r1, f2 to the bindings only in r2, and f to the bindings in both r1 and r2. The bindings are considered in increasing lexicographic order.

val fold2 : (dom -> codom -> 'a -> 'a) -> (dom -> codom -> 'a -> 'a) -> (dom -> codom -> 'a -> 'a) -> t -> t -> 'a -> 'a

fold2 f1 f2 f r1 r2 applies f1 to the bindings only in r1, f2 to the bindings only in r2, and f to the bindings in both r1 and r2. The bindings are considered in increasing lexicographic order.

val for_all2 : (dom -> codom -> bool) -> (dom -> codom -> bool) -> (dom -> codom -> bool) -> t -> t -> bool

for_all2 f1 f2 f r1 r2 is true if f1 is true on all the bindings only in r1, f2 is true on all the bindings only in r2, and f is true on all the bindings both in r1 and r2. The bindings are considered in increasing lexicographic order.

val exists2 : (dom -> codom -> bool) -> (dom -> codom -> bool) -> (dom -> codom -> bool) -> t -> t -> bool

exists2 f1 f2 f r1 r2 is true if f1 is true on one binding only in r1 or f2 is true on one binding only in r2, or f is true on one binding both in r1 and r2. The bindings are considered in increasing lexicographic order.

val iter2_diff : (dom -> codom -> unit) -> (dom -> codom -> unit) -> t -> t -> unit

iter2_diff f1 f2 r1 r2 applies f1 to the bindings only in r1 and f2 to the bindings only in r2. The bindings both in r1 and r2 are ignored. The bindings are considered in increasing lexicographic order. It is equivalent to calling iter2 with f = fun x y -> (), but more efficient.

val fold2_diff : (dom -> codom -> 'a -> 'a) -> (dom -> codom -> 'a -> 'a) -> t -> t -> 'a -> 'a

fold2_diff f1 f2 r1 r2 applies f1 to the bindings only in r1 and f2 to the bindings only in r2. The bindings both in r1 and r2 are ignored. The bindings are considered in increasing lexicographic order. It is equivalent to calling fold2 with f = fun x y acc -> acc, but more efficient.

val for_all2_diff : (dom -> codom -> bool) -> (dom -> codom -> bool) -> t -> t -> bool

for_all2_diff f1 f2 f r1 r2 is true if f1 is true on all the bindings only in r1 and f2 is true on all the bindings only in r2. The bindings both in r1 and r2 are ignored. The bindings are considered in increasing lexicographic order. It is equivalent to calling for_all2 with f = fun x y -> true, but more efficient.

val exists2_diff : (dom -> codom -> bool) -> (dom -> codom -> bool) -> t -> t -> bool

exists2_diff f1 f2 f r1 r2 is true if f1 is true on one binding only in r1 or f2 is true on one binding only in r2. The bindings both in r1 and r2 are ignored. The bindings are considered in increasing lexicographic order. It is equivalent to calling exists2 with f = fun x y -> false, but more efficient.

Multi-map operations

These functions consider the relation as a map from domain elements to codomain sets.

val iter_domain : (dom -> codom_set -> unit) -> t -> unit

iter_domain f r applies f x ys for every domain element x and its image set ys in r. The domain elements are considered in increasing order.

val fold_domain : (dom -> codom_set -> 'a -> 'a) -> t -> 'a -> 'a

fold_domain f r acc applies f x ys acc for every domain element x and its image set ys in r. The domain elements are considered in increasing order.

val map_domain : (dom -> codom_set -> codom_set) -> t -> t

map_domain f r returns a new relation where the image set ys of x in r is replaced with f x ys. The domain elements are considered in increasing order.

val for_all_domain : (dom -> codom_set -> bool) -> t -> bool

for_all_domain f r returns true if f x ys is true for every domain element x and its image set ys in r. The domain elements are considered in increasing order.

val exists_domain : (dom -> codom_set -> bool) -> t -> bool

exists_domain f r returns true if f x ys is true for at least one domain element x and its image set ys in r. The domain elements are considered in increasing order.

val filter_domain : (dom -> codom_set -> bool) -> t -> t

filter_domain f r returns a new relation restricted to the domain elements x with their image ys from r such that f x ys is true.

val min_domain : t -> dom

min_domain r returns the smallest domain element in r. Raises Not_found if the relation is empty.

val max_domain : t -> dom

max_domain r returns the greatest domain element in r. Raises Not_found if the relation is empty.

val choose_domain : t -> dom

choose_domain r returns any domain element in r. Raises Not_found if the relation is empty.

val cardinal_domain : t -> int

cardinal r returns the number of distinct domain elements used in r.

val elements_domain : t -> dom list

elemets_domain r returns the list of domain elements used in r. The elements are returned in increasing order.

Printing

type relation_printer = {
  1. print_empty : string;
    (*

    Special text for empty relations

    *)
  2. print_begin : string;
    (*

    Text before the first binding

    *)
  3. print_open : string;
    (*

    Text before a domain element

    *)
  4. print_comma : string;
    (*

    Text between a domain and a codomain element

    *)
  5. print_close : string;
    (*

    Text after a codomain element

    *)
  6. print_sep : string;
    (*

    Text between two bindings

    *)
  7. print_end : string;
    (*

    Text after the last binding

    *)
}

Tells how to print a relation.

val printer_default : relation_printer

Print as set: (dom1,codom1),...,(domN,codomN)

val to_string : relation_printer -> (dom -> string) -> (codom -> string) -> t -> string

String representation.

val print : relation_printer -> (Stdlib.out_channel -> dom -> unit) -> (Stdlib.out_channel -> codom -> unit) -> Stdlib.out_channel -> t -> unit

Prints to an output_channel (for Printf.(f)printf).

val fprint : relation_printer -> (Stdlib.Format.formatter -> dom -> unit) -> (Stdlib.Format.formatter -> codom -> unit) -> Stdlib.Format.formatter -> t -> unit

Prints to a formatter (for Format.(f)printf).

val bprint : relation_printer -> (Stdlib.Buffer.t -> dom -> unit) -> (Stdlib.Buffer.t -> codom -> unit) -> Stdlib.Buffer.t -> t -> unit

Prints to a string buffer (for Printf.bprintf).

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