319 lines
9.9 KiB
OCaml
319 lines
9.9 KiB
OCaml
(* camlp4r pa_extend.cmo q_MLast.cmo *)
|
|
(***********************************************************************)
|
|
(* *)
|
|
(* Camlp4 *)
|
|
(* *)
|
|
(* Daniel de Rauglaudre, projet Cristal, INRIA Rocquencourt *)
|
|
(* *)
|
|
(* Copyright 1998 Institut National de Recherche en Informatique et *)
|
|
(* Automatique. Distributed only by permission. *)
|
|
(* *)
|
|
(***********************************************************************)
|
|
|
|
(* $Id$ *)
|
|
|
|
open Pcaml;
|
|
|
|
type spat_comp =
|
|
[ SpTrm of MLast.loc and MLast.patt and option MLast.expr
|
|
| SpNtr of MLast.loc and MLast.patt and MLast.expr
|
|
| SpStr of MLast.loc and MLast.patt ]
|
|
;
|
|
type sexp_comp =
|
|
[ SeTrm of MLast.loc and MLast.expr | SeNtr of MLast.loc and MLast.expr ]
|
|
;
|
|
|
|
value strm_n = "strm__";
|
|
value peek_fun loc = <:expr< Stream.peek >>;
|
|
value junk_fun loc = <:expr< Stream.junk >>;
|
|
|
|
(* Parsers. *)
|
|
(* In syntax generated, many cases are optimisations. *)
|
|
|
|
value rec pattern_eq_expression p e =
|
|
match (p, e) with
|
|
[ (<:patt< $lid:a$ >>, <:expr< $lid:b$ >>) -> a = b
|
|
| (<:patt< $uid:a$ >>, <:expr< $uid:b$ >>) -> a = b
|
|
| (<:patt< $p1$ $p2$ >>, <:expr< $e1$ $e2$ >>) ->
|
|
pattern_eq_expression p1 e1 && pattern_eq_expression p2 e2
|
|
| _ -> False ]
|
|
;
|
|
|
|
value is_raise e =
|
|
match e with
|
|
[ <:expr< raise $_$ >> -> True
|
|
| _ -> False ]
|
|
;
|
|
|
|
value is_raise_failure e =
|
|
match e with
|
|
[ <:expr< raise Stream.Failure >> -> True
|
|
| _ -> False ]
|
|
;
|
|
|
|
value rec handle_failure e =
|
|
match e with
|
|
[ <:expr< try $te$ with [ Stream.Failure -> $e$] >> -> handle_failure e
|
|
| <:expr< match $me$ with [ $list:pel$ ] >> ->
|
|
handle_failure me &&
|
|
List.for_all
|
|
(fun
|
|
[ (_, None, e) -> handle_failure e
|
|
| _ -> False ])
|
|
pel
|
|
| <:expr< let $list:pel$ in $e$ >> ->
|
|
List.for_all (fun (p, e) -> handle_failure e) pel && handle_failure e
|
|
| <:expr< $lid:_$ >> | <:expr< $int:_$ >> | <:expr< $str:_$ >> |
|
|
<:expr< $chr:_$ >> | <:expr< fun [ $list:_$ ] >> | <:expr< $uid:_$ >> ->
|
|
True
|
|
| <:expr< raise $e$ >> ->
|
|
match e with
|
|
[ <:expr< Stream.Failure >> -> False
|
|
| _ -> True ]
|
|
| <:expr< $f$ $x$ >> ->
|
|
is_constr_apply f && handle_failure f && handle_failure x
|
|
| _ -> False ]
|
|
and is_constr_apply =
|
|
fun
|
|
[ <:expr< $uid:_$ >> -> True
|
|
| <:expr< $lid:_$ >> -> False
|
|
| <:expr< $x$ $_$ >> -> is_constr_apply x
|
|
| _ -> False ]
|
|
;
|
|
|
|
value rec subst v e =
|
|
let loc = MLast.loc_of_expr e in
|
|
match e with
|
|
[ <:expr< $lid:x$ >> ->
|
|
let x = if x = v then strm_n else x in <:expr< $lid:x$ >>
|
|
| <:expr< $uid:_$ >> -> e
|
|
| <:expr< $int:_$ >> -> e
|
|
| <:expr< $chr:_$ >> -> e
|
|
| <:expr< $str:_$ >> -> e
|
|
| <:expr< $_$.$_$ >> -> e
|
|
| <:expr< let $opt:rf$ $list:pel$ in $e$ >> ->
|
|
<:expr< let $opt:rf$ $list:List.map (subst_pe v) pel$ in $subst v e$ >>
|
|
| <:expr< $e1$ $e2$ >> -> <:expr< $subst v e1$ $subst v e2$ >>
|
|
| <:expr< ( $list:el$ ) >> -> <:expr< ( $list:List.map (subst v) el$ ) >>
|
|
| _ -> raise Not_found ]
|
|
and subst_pe v (p, e) =
|
|
match p with
|
|
[ <:patt< $lid:v'$ >> when v <> v' -> (p, subst v e)
|
|
| _ -> raise Not_found ]
|
|
;
|
|
|
|
value stream_pattern_component skont ckont =
|
|
fun
|
|
[ SpTrm loc p wo ->
|
|
<:expr< match $peek_fun loc$ $lid:strm_n$ with
|
|
[ Some $p$ $when:wo$ ->
|
|
do { $junk_fun loc$ $lid:strm_n$; $skont$ }
|
|
| _ -> $ckont$ ] >>
|
|
| SpNtr loc p e ->
|
|
let e =
|
|
match e with
|
|
[ <:expr< fun [ ($lid:v$ : Stream.t _) -> $e$ ] >> when v = strm_n -> e
|
|
| _ -> <:expr< $e$ $lid:strm_n$ >> ]
|
|
in
|
|
if pattern_eq_expression p skont then
|
|
if is_raise_failure ckont then e
|
|
else if handle_failure e then e
|
|
else <:expr< try $e$ with [ Stream.Failure -> $ckont$ ] >>
|
|
else if is_raise_failure ckont then <:expr< let $p$ = $e$ in $skont$ >>
|
|
else if pattern_eq_expression <:patt< Some $p$ >> skont then
|
|
<:expr< try Some $e$ with [ Stream.Failure -> $ckont$ ] >>
|
|
else if is_raise ckont then
|
|
let tst =
|
|
if handle_failure e then e
|
|
else <:expr< try $e$ with [ Stream.Failure -> $ckont$ ] >>
|
|
in
|
|
<:expr< let $p$ = $tst$ in $skont$ >>
|
|
else
|
|
<:expr< match try Some $e$ with [ Stream.Failure -> None ] with
|
|
[ Some $p$ -> $skont$
|
|
| _ -> $ckont$ ] >>
|
|
| SpStr loc p ->
|
|
try
|
|
match p with
|
|
[ <:patt< $lid:v$ >> -> subst v skont
|
|
| _ -> raise Not_found ]
|
|
with
|
|
[ Not_found -> <:expr< let $p$ = $lid:strm_n$ in $skont$ >> ] ]
|
|
;
|
|
|
|
value rec stream_pattern loc epo e ekont =
|
|
fun
|
|
[ [] ->
|
|
match epo with
|
|
[ Some ep -> <:expr< let $ep$ = Stream.count $lid:strm_n$ in $e$ >>
|
|
| _ -> e ]
|
|
| [(spc, err) :: spcl] ->
|
|
let skont =
|
|
let ekont err =
|
|
let str =
|
|
match err with
|
|
[ Some estr -> estr
|
|
| _ -> <:expr< "" >> ]
|
|
in
|
|
<:expr< raise (Stream.Error $str$) >>
|
|
in
|
|
stream_pattern loc epo e ekont spcl
|
|
in
|
|
let ckont = ekont err in stream_pattern_component skont ckont spc ]
|
|
;
|
|
|
|
value stream_patterns_term loc ekont tspel =
|
|
let pel =
|
|
List.map
|
|
(fun (p, w, loc, spcl, epo, e) ->
|
|
let p = <:patt< Some $p$ >> in
|
|
let e =
|
|
let ekont err =
|
|
let str =
|
|
match err with
|
|
[ Some estr -> estr
|
|
| _ -> <:expr< "" >> ]
|
|
in
|
|
<:expr< raise (Stream.Error $str$) >>
|
|
in
|
|
let skont = stream_pattern loc epo e ekont spcl in
|
|
<:expr< do { $junk_fun loc$ $lid:strm_n$; $skont$ } >>
|
|
in
|
|
(p, w, e))
|
|
tspel
|
|
in
|
|
let pel = pel @ [(<:patt< _ >>, None, ekont ())] in
|
|
<:expr< match $peek_fun loc$ $lid:strm_n$ with [ $list:pel$ ] >>
|
|
;
|
|
|
|
value rec group_terms =
|
|
fun
|
|
[ [([(SpTrm loc p w, None) :: spcl], epo, e) :: spel] ->
|
|
let (tspel, spel) = group_terms spel in
|
|
([(p, w, loc, spcl, epo, e) :: tspel], spel)
|
|
| spel -> ([], spel) ]
|
|
;
|
|
|
|
value rec parser_cases loc =
|
|
fun
|
|
[ [] -> <:expr< raise Stream.Failure >>
|
|
| spel ->
|
|
match group_terms spel with
|
|
[ ([], [(spcl, epo, e) :: spel]) ->
|
|
stream_pattern loc epo e (fun _ -> parser_cases loc spel) spcl
|
|
| (tspel, spel) ->
|
|
stream_patterns_term loc (fun _ -> parser_cases loc spel) tspel ] ]
|
|
;
|
|
|
|
value cparser loc bpo pc =
|
|
let e = parser_cases loc pc in
|
|
let e =
|
|
match bpo with
|
|
[ Some bp -> <:expr< let $bp$ = Stream.count $lid:strm_n$ in $e$ >>
|
|
| None -> e ]
|
|
in
|
|
let p = <:patt< ($lid:strm_n$ : Stream.t _) >> in <:expr< fun $p$ -> $e$ >>
|
|
;
|
|
|
|
value cparser_match loc me bpo pc =
|
|
let pc = parser_cases loc pc in
|
|
let e =
|
|
match bpo with
|
|
[ Some bp -> <:expr< let $bp$ = Stream.count $lid:strm_n$ in $pc$ >>
|
|
| None -> pc ]
|
|
in
|
|
match me with
|
|
[ <:expr< $lid:x$ >> when x = strm_n -> e
|
|
| _ -> <:expr< let ($lid:strm_n$ : Stream.t _) = $me$ in $e$ >> ]
|
|
;
|
|
|
|
(* streams *)
|
|
|
|
value rec not_computing =
|
|
fun
|
|
[ <:expr< $lid:_$ >> | <:expr< $uid:_$ >> | <:expr< $int:_$ >> |
|
|
<:expr< $flo:_$ >> | <:expr< $chr:_$ >> | <:expr< $str:_$ >> ->
|
|
True
|
|
| <:expr< $x$ $y$ >> -> is_cons_apply_not_computing x && not_computing y
|
|
| _ -> False ]
|
|
and is_cons_apply_not_computing =
|
|
fun
|
|
[ <:expr< $uid:_$ >> -> True
|
|
| <:expr< $lid:_$ >> -> False
|
|
| <:expr< $x$ $y$ >> -> is_cons_apply_not_computing x && not_computing y
|
|
| _ -> False ]
|
|
;
|
|
|
|
value slazy loc e =
|
|
match e with
|
|
[ <:expr< $f$ () >> ->
|
|
match f with
|
|
[ <:expr< $lid:_$ >> -> f
|
|
| _ -> <:expr< fun _ -> $e$ >> ]
|
|
| _ -> <:expr< fun _ -> $e$ >> ]
|
|
;
|
|
|
|
value rec cstream gloc =
|
|
fun
|
|
[ [] -> let loc = gloc in <:expr< Stream.sempty >>
|
|
| [SeTrm loc e] ->
|
|
if not_computing e then <:expr< Stream.ising $e$ >>
|
|
else <:expr< Stream.lsing $slazy loc e$ >>
|
|
| [SeTrm loc e :: secl] ->
|
|
if not_computing e then <:expr< Stream.icons $e$ $cstream gloc secl$ >>
|
|
else <:expr< Stream.lcons $slazy loc e$ $cstream gloc secl$ >>
|
|
| [SeNtr loc e] ->
|
|
if not_computing e then e else <:expr< Stream.slazy $slazy loc e$ >>
|
|
| [SeNtr loc e :: secl] ->
|
|
if not_computing e then <:expr< Stream.iapp $e$ $cstream gloc secl$ >>
|
|
else <:expr< Stream.lapp $slazy loc e$ $cstream gloc secl$ >> ]
|
|
;
|
|
|
|
(* Syntax extensions in Revised Syntax grammar *)
|
|
|
|
EXTEND
|
|
GLOBAL: expr;
|
|
expr: LEVEL "top"
|
|
[ [ "parser"; po = OPT ipatt; "["; pcl = LIST0 parser_case SEP "|"; "]" ->
|
|
<:expr< $cparser loc po pcl$ >>
|
|
| "parser"; po = OPT ipatt; pc = parser_case ->
|
|
<:expr< $cparser loc po [pc]$ >>
|
|
| "match"; e = SELF; "with"; "parser"; po = OPT ipatt; "[";
|
|
pcl = LIST0 parser_case SEP "|"; "]" ->
|
|
<:expr< $cparser_match loc e po pcl$ >>
|
|
| "match"; e = SELF; "with"; "parser"; po = OPT ipatt;
|
|
pc = parser_case ->
|
|
<:expr< $cparser_match loc e po [pc]$ >> ] ]
|
|
;
|
|
parser_case:
|
|
[ [ "[:"; sp = stream_patt; ":]"; po = OPT ipatt; "->"; e = expr ->
|
|
(sp, po, e) ] ]
|
|
;
|
|
stream_patt:
|
|
[ [ spc = stream_patt_comp -> [(spc, None)]
|
|
| spc = stream_patt_comp; ";";
|
|
sp = LIST1 stream_patt_comp_err SEP ";" ->
|
|
[(spc, None) :: sp]
|
|
| -> [] ] ]
|
|
;
|
|
stream_patt_comp_err:
|
|
[ [ spc = stream_patt_comp; eo = OPT [ "?"; e = expr -> e ] ->
|
|
(spc, eo) ] ]
|
|
;
|
|
stream_patt_comp:
|
|
[ [ "`"; p = patt; eo = OPT [ "when"; e = expr -> e ] -> SpTrm loc p eo
|
|
| p = patt; "="; e = expr -> SpNtr loc p e
|
|
| p = patt -> SpStr loc p ] ]
|
|
;
|
|
ipatt:
|
|
[ [ i = LIDENT -> <:patt< $lid:i$ >> ] ]
|
|
;
|
|
expr: LEVEL "simple"
|
|
[ [ "[:"; se = LIST0 stream_expr_comp SEP ";"; ":]" ->
|
|
<:expr< $cstream loc se$ >> ] ]
|
|
;
|
|
stream_expr_comp:
|
|
[ [ "`"; e = expr -> SeTrm loc e | e = expr -> SeNtr loc e ] ]
|
|
;
|
|
END;
|