package ego

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The LANGUAGE module type represents the definition of an arbitrary language for use with an EGraph.

type 'a shape

Encodes the "shape" of an expression in the language over sub-expressions of type 'a.

type op

Represents the tags that discriminate the expression constructors of the language.

type t =
  1. | Mk of t shape

Represents concrete terms of the language by "tying-the-knot".

val equal_op : op -> op -> bool

equal_op op1 op2 returns true if the operators op1, op2 are equal.

val pp_shape : (Stdlib.Format.formatter -> 'a -> unit) -> Stdlib.Format.formatter -> 'a shape -> unit

pp_shape f fmt s pretty prints expressions of the language.

val compare_shape : ('a -> 'a -> int) -> 'a shape -> 'a shape -> int

compare cmp a b compares expressions a and b using cmp to compare subexpressions.

val op : 'a shape -> op

op expr retrieves the tag that discriminates the shape of the expression expr.

val children : 'a shape -> 'a list

children exp returns the subexpressions of expression exp.

val map_children : 'a shape -> ('a -> 'b) -> 'b shape

map_children exp f maps the function f over the sub-expressions of the expression exp

val make : op -> 'a list -> 'a shape

make op ls constructs an expression from the tag op and children ls.

Note: If called with invalid arity of arguments for the operator op the function may throw an error.


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