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|
/* $Id: atd_parser.mly 51874 2010-11-16 05:28:46Z martin $ */
/*
ATD Parser
requires menhir.
*/
%{
open Printf
open Atd_ast
let syntax_error s pos1 pos2 =
let msg = sprintf "%s:\n%s" (string_of_loc (pos1, pos2)) s in
error msg
%}
%token TYPE EQ OP_PAREN CL_PAREN OP_BRACK CL_BRACK OP_CURL CL_CURL
SEMICOLON COMMA COLON STAR OF EOF BAR LT GT INHERIT
QUESTION TILDE
%token < string > STRING LIDENT UIDENT TIDENT
%start full_module
%type < Atd_ast.full_module > full_module
%%
full_module:
| x = annot y = module_body { ((($startpos(x), $endpos(x)), x), y) }
;
module_body:
| module_item module_body { $1 :: $2 }
| EOF { [] }
| _e=error { syntax_error "Syntax error" $startpos(_e) $endpos(_e) }
;
annot:
| x = asection l = annot { x :: l }
| { ([] : annot) }
;
asection:
| LT x = LIDENT l = afield_list GT { (x, (($startpos, $endpos), l)) }
| LT LIDENT afield_list _e=error { syntax_error
"Expecting '>'"
$startpos(_e) $endpos(_e) }
| LT _e=error { syntax_error
"Expecting lowercase identifier"
$startpos(_e) $endpos(_e) }
;
afield_list:
| x = afield l = afield_list { x :: l }
| { [] }
;
afield:
| LIDENT EQ STRING { ($1, (($startpos, $endpos), Some $3)) }
| LIDENT { ($1, (($startpos, $endpos), None)) }
;
module_item:
| TYPE p = type_param s = LIDENT a = annot EQ t = type_expr
{ `Type (($startpos, $endpos), (s, p, a), t) }
| TYPE type_param LIDENT annot EQ _e=error
{ syntax_error "Expecting type expression" $startpos(_e) $endpos(_e) }
| TYPE type_param LIDENT annot _e=error
{ syntax_error "Expecting '='" $startpos(_e) $endpos(_e) }
| TYPE _e=error
{ syntax_error "Expecting type name" $startpos(_e) $endpos(_e) }
;
type_param:
| TIDENT { [ $1 ] }
| OP_PAREN type_var_list CL_PAREN { $2 }
| { [] }
| OP_PAREN type_var_list _e=error
{ syntax_error "Expecting ')'" $startpos(_e) $endpos(_e) }
;
type_var_list:
| TIDENT COMMA type_var_list { $1 :: $3 }
| TIDENT { [ $1 ] }
;
type_expr:
| OP_BRACK l = variant_list CL_BRACK a = annot
{ `Sum (($startpos, $endpos), l, a) }
| OP_BRACK CL_BRACK a = annot
{ `Sum (($startpos, $endpos), [], a) }
| OP_CURL l = field_list CL_CURL a = annot
{ `Record (($startpos, $endpos), l, a) }
| OP_CURL CL_CURL a = annot
{ `Record (($startpos, $endpos), [], a) }
| OP_PAREN l = cartesian_product CL_PAREN a = annot
{ `Tuple (($startpos, $endpos), l, a) }
| x = type_inst a = annot
{ let pos1 = $startpos in
let pos2 = $endpos in
let loc = (pos1, pos2) in
let loc2, name, args = x in
match name, args with
"list", [x] -> `List (loc, x, a)
| "option", [x] -> `Option (loc, x, a)
| "shared", [x] ->
let a =
if Atd_annot.has_field ["share"] "id" a then
(* may cause ID clashes if not used properly *)
a
else
Atd_annot.set_field loc
"share" "id" (Some (Atd_annot.create_id ())) a
in
`Shared (loc, x, a)
| ("list"|"option"|"shared"), _ ->
syntax_error (sprintf "%s expects one argument" name) pos1 pos2
| _ -> (`Name (loc, x, a) : type_expr) }
| x = TIDENT
{ `Tvar (($startpos, $endpos), x) }
| OP_BRACK variant_list _e=error
{ syntax_error "Expecting ']'" $startpos(_e) $endpos(_e) }
| OP_CURL field_list _e=error
{ syntax_error "Expecting '}'" $startpos(_e) $endpos(_e) }
| OP_PAREN cartesian_product _e=error
{ syntax_error "Expecting ')'" $startpos(_e) $endpos(_e) }
;
cartesian_product:
| x = annot_expr STAR l = cartesian_product { x :: l }
| x = annot_expr STAR y = annot_expr { [ x; y ] }
;
annot_expr:
| a = annot COLON x = type_expr { (($startpos, $endpos), x, a) }
| x = type_expr { (($startpos, $endpos), x, []) }
;
type_inst:
| l = type_args s = LIDENT { (($startpos, $endpos), s, l) }
;
type_args:
| type_expr { [ $1 ] }
| OP_PAREN type_arg_list CL_PAREN { $2 }
| { [] }
| OP_PAREN type_arg_list _e=error
{ syntax_error "Expecting ')'" $startpos(_e) $endpos(_e) }
;
type_arg_list:
| type_expr COMMA type_arg_list { $1 :: $3 }
| type_expr { [ $1 ] }
;
variant_list:
| BAR variant_list0 { $2 }
| variant_list0 { $1 }
;
variant_list0:
| variant BAR variant_list0 { $1 :: $3 }
| variant { ([ $1 ] : variant list) }
;
variant:
| x = UIDENT a = annot OF t = type_expr
{ `Variant (($startpos, $endpos), (x, a), Some t) }
| x = UIDENT a = annot
{ `Variant (($startpos, $endpos), (x, a), None) }
| INHERIT t = type_expr
{ `Inherit (($startpos, $endpos), t) }
| UIDENT annot OF _e=error
{ syntax_error "Expecting type expression after 'of'"
$startpos(_e) $endpos(_e) }
;
field_list:
| x = field SEMICOLON l = field_list { x :: l }
| x = field SEMICOLON { [ x ] }
| x = field { [ x ] }
;
field:
| fn = field_name a = annot COLON t = type_expr
{ let k, fk = fn in
`Field (($startpos, $endpos), (k, fk, a), t) }
| INHERIT t = type_expr
{ `Inherit (($startpos, $endpos), t) }
| field_name annot COLON _e=error
{ syntax_error "Expecting type expression after ':'"
$startpos(_e) $endpos(_e) }
| field_name annot _e=error
{ syntax_error "Expecting ':'" $startpos(_e) $endpos(_e) }
;
field_name:
| k = LIDENT { (k, `Required) }
| QUESTION k = LIDENT { (k, `Optional) }
| TILDE k = LIDENT { (k, `With_default) }
;
|
