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|
(* camlp5r *)
(* parserify.ml,v *)
(* Copyright (c) INRIA 2007-2017 *)
#load "q_MLast.cmo";
(* Heuristic to rebuild parsers and streams from the AST *)
open Pretty;
open Prtools;
open Versdep;
open Exparser ;
type spat_comp = Exparser.spat_comp;
type spat_comp_opt = Exparser.spat_comp_opt ;
type spat_parser_ast = Exparser.spat_parser_ast ;
(* Rebuilding syntax tree *)
value loc = Ploc.dummy;
value rec handle_failure e =
match e with
[ <:expr< match $e$ with [ $list:pel$ ] >> ->
handle_failure e &&
List.for_all
(fun
[ (p, <:vala< None >>, e) -> handle_failure e
| _ -> False ])
pel
| <:expr< raise $e$ >> ->
match e with
[ <:expr< Stream.Failure >> -> False
| _ -> True ]
| <:expr< try $te$ with [ Stream.Failure -> $e$] >> -> handle_failure e
| <:expr< $f$ $e$ >> ->
no_raising_failure_fun f && handle_failure f && handle_failure e
| <:expr< $lid:_$ >> | <:expr< $uid:_$ >> -> True
| _ -> False ]
and no_raising_failure_fun =
fun
[ <:expr< $x$ $y$ >> -> no_raising_failure_fun x && handle_failure y
| <:expr< $uid:_$ >> -> True
| _ -> False ]
;
value rec contains_strm__ =
fun
[ <:expr< $e1$ $e2$ >> -> contains_strm__ e1 || contains_strm__ e2
| <:expr< strm__ >> -> True
| <:expr< let $flag:_$ $list:pel$ in $e$ >> -> contains_strm__ e
| <:expr< try $e$ with [ $list:pel$ ] >> -> contains_strm__ e
| <:expr< match $e$ with [ $list:pel$ ] >> -> contains_strm__ e
| _ -> False ]
;
value err =
fun
[ <:expr< "" >> -> SpoNoth
| e -> SpoQues e ]
;
value rec simpl =
fun
[ <:expr<
match try Some $f$ with [ Stream.Failure -> None ] with
[ Some $lid:s1$ -> $lid:s2$
| _ -> raise Stream.Failure ]
>> as e ->
if s1 = s2 then f else e
| <:expr< match $e$ with [ Some $p1$ → $e1$ | _ → $e2$ ] >> →
<:expr< match $e$ with [ Some $p1$ → $e1$ | _ → $simpl e2$ ] >>
| e →
e ]
;
value rec unstream_pattern_kont =
fun
[ <:expr<
let $p$ =
try $f$ with [ Stream.Failure -> raise (Stream.Error $e2$) ]
in
$e$
>> |
<:expr<
match try Some $f$ with [ Stream.Failure -> None ] with
[ Some $p$ -> $e$
| _ -> raise (Stream.Error $e2$) ]
>> ->
let f =
match f with
[ <:expr< $f$ strm__ >> -> f
| _ -> <:expr< fun (strm__ : Stream.t _) -> $f$ >> ]
in
let (sp, epo, e) = unstream_pattern_kont e in
([(SpNtr loc p f, err e2) :: sp], epo, e)
| <:expr< let $lid:p$ = Stream.count strm__ in $e$ >> ->
([], Some <:patt< $lid:p$ >>, e)
| <:expr< let $p$ = strm__ in $e$ >> ->
let (sp, epo, e) = unstream_pattern_kont e in
([(SpStr loc p, SpoNoth) :: sp], epo, e)
| <:expr<
match try Some ($f$ strm__) with [ Stream.Failure → None ] with
[ Some $lid:s1$ → $lid:s2$
| _ → raise Stream.Failure ]
>> as e →
if s1 = s2 then
([(SpNtr loc <:patt< a >> f, SpoBang)], None, <:expr< a >>)
else
([], None, e)
| <:expr<
match try Some $e1$ with [ Stream.Failure → None ] with
[ Some $lid:s$ → $e2$
| _ → raise Stream.Failure ]
>> →
let e = <:expr< let $lid:s$ = $e1$ in $e2$ >> in
unstream_pattern_kont e
| <:expr< let $p$ = $e1$ in $e2$ >> as ge ->
if contains_strm__ e1 then
let (f, err) =
match e1 with
[ <:expr< $f$ strm__ >> -> (f, SpoBang)
| _ ->
let f = <:expr< fun (strm__ : Stream.t _) -> $e1$ >> in
let err = if handle_failure e1 then SpoNoth else SpoBang in
(f, err) ]
in
let (sp, epo, e) = unstream_pattern_kont e2 in
([(SpNtr loc p f, err) :: sp], epo, e)
else
let (sp, epo, e) = unstream_pattern_kont e2 in
if sp = [] then ([], None, ge)
else ([(SpLet loc p e1, SpoNoth) :: sp], epo, e)
| <:expr<
match Stream.peek strm__ with
[ Some $p$ -> do { Stream.junk strm__; $e$ }
| _ -> raise (Stream.Error $e2$) ]
>> ->
let (sp, epo, e) = unstream_pattern_kont e in
let sp = [(SpTrm loc p <:vala< None >>, err e2) :: sp] in
(sp, epo, e)
| <:expr< match Stream.peek strm__ with [ $list:_$ ] >> |
<:expr<
match try Some ($_$ strm__) with [ Stream.Failure -> None ] with
[ Some $_$ -> $_$
| _ -> $_$ ]
>> as ge ->
let f = <:expr< fun (strm__ : Stream.t _) -> $ge$ >> in
let err = if handle_failure ge then SpoNoth else SpoBang in
([(SpNtr loc <:patt< a >> f, err)], None, <:expr< a >>)
| <:expr<
try $f$ strm__ with [ Stream.Failure -> raise (Stream.Error $e$) ]
>> ->
([(SpNtr loc <:patt< a >> f, err e)], None, <:expr< a >>)
| <:expr< try $f$ with [ Stream.Failure -> raise (Stream.Error $e$) ] >> ->
let f = <:expr< fun (strm__ : Stream.t _) -> $f$ >> in
([(SpNtr loc <:patt< a >> f, err e)], None, <:expr< a >>)
| <:expr< $f$ strm__ >> ->
([(SpNtr loc <:patt< a >> f, SpoBang)], None, <:expr< a >>)
| e -> ([], None, e) ]
;
value rec unparser_cases_list =
fun
[ <:expr<
let $p$ = try $f$ strm__ with [ Stream.Failure -> raise $e2$ ] in $e1$
>> ->
let spe1 =
let (sp, epo, e) = unstream_pattern_kont e1 in
([(SpNtr loc p f, SpoNoth) :: sp], epo, e)
in
let spe2 = ([], None, <:expr< raise $e2$ >>) in
[spe1; spe2]
| <:expr< let $lid:p$ = Stream.count strm__ in $e$ >> ->
[([], Some <:patt< $lid:p$ >>, e)]
| <:expr< let $p$ = $f$ strm__ in $e$ >> ->
let (sp, epo, e) = unstream_pattern_kont e in
[([(SpNtr loc p f, SpoNoth) :: sp], epo, e)]
| <:expr< let $p$ = strm__ in $e$ >> ->
let (sp, epo, e) = unstream_pattern_kont e in
[([(SpStr loc p, SpoNoth) :: sp], epo, e)]
| <:expr< match Stream.peek strm__ with [ $list:pel$ ] >> as ge ->
loop [] pel where rec loop rev_spel =
fun
[ [(<:patt< _ >>, <:vala< None >>, e)] ->
list_rev_append rev_spel (unparser_cases_list e)
| [(<:patt< Some $p$ >>, eo,
<:expr< do { Stream.junk strm__; $e$ } >>) ::
pel] ->
let spe =
let (sp, epo, e) = unstream_pattern_kont e in
let sp = [(SpTrm loc p eo, SpoNoth) :: sp] in
(sp, epo, e)
in
loop [spe :: rev_spel] pel
| _ ->
[([], None, ge)] ]
| <:expr<
match try Some ($f$ strm__) with [ Stream.Failure -> None ] with
[ Some $p1$ -> $e1$
| _ -> $e2$ ]
>> ->
let spe =
let (sp, epo, e) = unstream_pattern_kont e1 in
let sp = [(SpNtr loc p1 f, SpoNoth) :: sp] in
(sp, epo, e)
in
let spel = unparser_cases_list e2 in
[spe :: spel]
| <:expr<
match try Some $f$ with [ Stream.Failure -> None ] with
[ Some $p1$ -> $e1$
| _ -> $e2$ ]
>> ->
let e =
<:expr<
match try Some $simpl f$ with [ Stream.Failure -> None ] with
[ Some $p1$ -> $simpl e1$
| _ -> $simpl e2$ ]
>>
in
[([], None, e)]
| <:expr< try $f$ strm__ with [ Stream.Failure -> $e$ ] >> ->
let spe = ([(SpNtr loc <:patt< a >> f, SpoNoth)], None, <:expr< a >>) in
let spel = unparser_cases_list e in
[spe :: spel]
| <:expr< try Some ($f$ strm__) with [ Stream.Failure -> $e$ ] >> ->
let spe =
([(SpNtr loc <:patt< a >> f, SpoNoth)], None, <:expr< Some a >>)
in
let spel = unparser_cases_list e in
[spe :: spel]
| <:expr< try $f$ with [ Stream.Failure -> $e$ ] >> ->
let f = <:expr< fun (strm__ : Stream.t _) -> $f$ >> in
let spe = ([(SpNtr loc <:patt< a >> f, SpoNoth)], None, <:expr< a >>) in
let spel = unparser_cases_list e in
[spe :: spel]
| <:expr< $f$ strm__ >> ->
let spe = ([(SpNtr loc <:patt< a >> f, SpoNoth)], None, <:expr< a >>) in
[spe]
| <:expr< raise Stream.Failure >> ->
[]
| e ->
[([], None, e)] ]
;
value unparser_body e =
let (po, e) =
match e with
[ <:expr< let $lid:bp$ = Stream.count $lid:strm_n$ in $e$ >> ->
(Some <:patt< $lid:bp$ >>, e)
| _ -> (None, e) ]
in
let spel = unparser_cases_list e in
(po, spel)
;
|
