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|
(*i camlp4deps: "parsing/grammar.cma" i*)
(* $Id$ *)
open Pcoq
open Constr
GEXTEND Gram
GLOBAL : constr1 pattern;
pattern:
[ [ id = ident -> id
| "("; p = compound_pattern; ")" -> p ] ]
;
compound_pattern:
[ [ p = pattern ; lp = ne_pattern_list ->
<:ast< (PATTCONSTRUCT $p ($LIST $lp)) >>
| p = pattern; "as"; id = ident ->
<:ast< (PATTAS $id $p)>>
| p1 = pattern; ","; p2 = pattern ->
<:ast< (PATTCONSTRUCT pair $p1 $p2) >> ] ]
;
ne_pattern_list:
[ [ c1 = pattern; cl = ne_pattern_list -> c1 :: cl
| c1 = pattern -> [c1] ] ]
;
equation:
[ [ lhs = ne_pattern_list; "=>"; rhs = constr ->
<:ast< (EQN $rhs ($LIST $lhs)) >> ] ]
;
ne_eqn_list:
[ [ e = equation; "|"; leqn = ne_eqn_list -> e :: leqn
| e = equation -> [e] ] ]
;
constr1:
[ [ "<"; l1 = lconstr; ">"; "Cases"; lc = ne_constr_list; "of";
OPT "|"; eqs = ne_eqn_list; "end" ->
<:ast< (CASES $l1 (TOMATCH ($LIST $lc)) ($LIST $eqs)) >>
| "Cases"; lc = ne_constr_list; "of";
OPT "|"; eqs = ne_eqn_list; "end" ->
<:ast< (CASES "SYNTH" (TOMATCH ($LIST $lc)) ($LIST $eqs)) >>
| "<"; l1 = lconstr; ">"; "Cases"; lc = ne_constr_list; "of";
"end" ->
<:ast< (CASES $l1 (TOMATCH ($LIST $lc))) >>
| "Cases"; lc = ne_constr_list; "of"; "end" ->
<:ast< (CASES "SYNTH" (TOMATCH ($LIST $lc))) >> ] ]
;
END;
|
