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|
open Ast
module IntSet = Set.Make (Int)
let add_node (fmt : Format.formatter) (i : expr index) (expr : expr) : unit =
match expr with
| App _ ->
Format.fprintf fmt
" expr%d [fontname=\"CMU Typewriter Text Bold\", label=\"apply\"];\n"
i.index
| Int n -> Format.fprintf fmt " expr%d [label=\"%d\"];\n" i.index n
| Lam _ -> Format.fprintf fmt " expr%d [label=\"λ\"];\n" i.index
| Prim (Add, _) -> Format.fprintf fmt " expr%d [label=\"+\"];\n" i.index
| Prim (Sub, _) -> Format.fprintf fmt " expr%d [label=\"-\"];\n" i.index
| Prim (Mul, _) -> Format.fprintf fmt " expr%d [label=\"*\"];\n" i.index
| Var x -> Format.fprintf fmt " expr%d [label=%S];\n" i.index x
let add_expr_edges (ast : 'a ast) (fmt : Format.formatter)
(nodes : IntSet.t ref) : expr index -> unit =
let rec loop (i : expr index) : unit =
nodes := IntSet.add i.index !nodes;
let edge_to (j : expr index) : unit =
loop j;
Format.fprintf fmt " expr%d -> expr%d;\n" i.index j.index
in
match get_subexpr ast i with
| App (f, x) ->
edge_to f;
edge_to x
| Int _ -> ()
| Lam (x, b) ->
Format.fprintf fmt " expr%d -> expr%d_var;\n" i.index i.index;
Format.fprintf fmt " expr%d_var [label=%S];\n" i.index x;
edge_to b
| Prim (Add, (l, r)) ->
edge_to l;
edge_to r
| Prim (Sub, (l, r)) ->
edge_to l;
edge_to r
| Prim (Mul, (l, r)) ->
edge_to l;
edge_to r
| Var _ -> ()
in
loop
let draw_tree (ast : expr ast) : string =
let buf = Buffer.create 16 and nodes = ref IntSet.empty in
let fmt = Format.formatter_of_buffer buf in
Format.fprintf fmt "digraph {\n";
add_expr_edges ast fmt nodes ast.root;
Format.fprintf fmt "\n";
IntSet.iter
(fun index ->
let i = { index } in
add_node fmt i (get_subexpr ast i))
!nodes;
Format.fprintf fmt "}\n";
Format.pp_print_flush fmt ();
Buffer.contents buf
|
