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|
%{
open Ast
open Util
%}
%token BOOL INT REAL
%token PROBE
%token TRUE FALSE
%token IF THEN ELSE
%token NOT AND OR
%token MOD
%token CONST NODE FUNCTION RETURNS
%token VAR LET TEL
%token PRE
%token ASSUME GUARANTEE
%token ACTIVATE
%token AUTOMATON STATE INITIAL UNTIL UNLESS RESUME RESTART
%token LPAREN RPAREN
%token LCURLY RCURLY
%token STAR PLUS MINUS DIVIDE
%token LESS GREATER LESS_EQUAL GREATER_EQUAL
%token DIFF EQUAL
%token SEMICOLON COLON COMMA
%token ARROW
%token <string> IDENT
%token <string> INTVAL
%token <string> REALVAL
%token EOF
(* Lowest priorities first *)
%left ARROW
%left OR
%left AND
%left EQUAL DIFF
%left LESS GREATER LESS_EQUAL GREATER_EQUAL
%left PLUS MINUS
%left STAR DIVIDE MOD
(* Root token *)
%start<Ast.toplevel list> file
%%
file:
| t=list(toplevel) EOF { t }
toplevel:
| d=ext(const_decl) { AST_const_decl d }
| d=ext(node_decl) { AST_node_decl d }
primary_expr:
| LPAREN e=expr RPAREN { e }
| e=ext(IDENT) { AST_identifier e }
| e=ext(INTVAL) { AST_int_const e }
| e=ext(REALVAL) { AST_real_const e }
| TRUE { AST_bool_const true }
| FALSE { AST_bool_const false }
| e=ext(IDENT) LPAREN l=separated_list(COMMA,ext(expr)) RPAREN
{ AST_instance (e, l, fst e ^ uid ()) }
unary_expr:
| e=primary_expr { e }
| NOT e=ext(unary_expr) { AST_not(e) }
| PRE e=ext(unary_expr) { AST_pre(e, "pre"^uid()) }
| o=unary_op e=ext(unary_expr) { AST_unary (o, e) }
%inline unary_op:
| PLUS { AST_UPLUS }
| MINUS { AST_UMINUS }
binary_expr:
| e=unary_expr { e }
| e=ext(binary_expr) ARROW f=ext(binary_expr) { AST_arrow(e, f) }
| e=ext(binary_expr) o=binary_op f=ext(binary_expr) { AST_binary (o, e, f) }
| e=ext(binary_expr) o=binary_rel f=ext(binary_expr) { AST_binary_rel (o, e, f) }
| e=ext(binary_expr) o=binary_bool f=ext(binary_expr) { AST_binary_bool (o, e, f) }
%inline binary_op:
| STAR { AST_MUL }
| DIVIDE { AST_DIV }
| MOD { AST_MOD }
| PLUS { AST_PLUS }
| MINUS { AST_MINUS }
%inline binary_rel:
| LESS { AST_LT }
| GREATER { AST_GT }
| LESS_EQUAL { AST_LE }
| GREATER_EQUAL { AST_GE }
| EQUAL { AST_EQ}
| DIFF { AST_NE }
%inline binary_bool:
| AND { AST_AND }
| OR { AST_OR }
if_expr:
| IF c=ext(expr) THEN t=ext(expr) ELSE e=ext(expr) { AST_if(c, t, e) }
| e=binary_expr { e }
expr:
| e=if_expr { e }
(* Equations (can be asserts, automata, ...) *)
automaton:
| AUTOMATON a=IDENT? s=list(ext(state)) RETURNS r=separated_list(COMMA, IDENT)
{ ((match a with Some n -> n | None -> "aut") ^ uid (), s, r) }
state:
| i=boption(INITIAL) STATE n=IDENT
unless=trans(UNLESS)
v=option(var_decl)
b=body
until=trans(UNTIL)
{ if unless <> [] then failwith "UNLESS transitions not supported.";
{ initial = i;
st_name = n;
st_locals = (match v with Some v -> v | None -> []);
body = b;
until = until;
} }
trans(TT):
| TT t=nonempty_list(terminated(transition, SEMICOLON)) { t }
| { [] }
transition:
| IF e=ext(expr) RESUME s=ext(IDENT) { (e, s, false) }
| IF e=ext(expr) RESTART s=ext(IDENT) { (e, s, true) }
activate:
| ACTIVATE a=activate_if RETURNS r=separated_list(COMMA, IDENT) { (a, r) }
activate_if:
| IF c=ext(expr) THEN t=activate_if ELSE e=activate_if { AST_activate_if(c, t, e) }
| lv=option(var_decl) b=body
{ AST_activate_body {
act_id = "act"^uid();
act_locals = (match lv with Some v -> v | None -> []);
body = b;
} }
eqn:
| i=separated_list(COMMA, ext(IDENT)) EQUAL e=ext(expr)
{ AST_assign(i, e) }
| ASSUME i=ext(IDENT) COLON e=ext(expr) { AST_assume(i, e) }
| GUARANTEE i=ext(IDENT) COLON e=ext(expr) { AST_guarantee(i, e) }
| a=automaton { AST_automaton(a) }
| a=activate { AST_activate(a) }
typ:
| INT { AST_TINT }
| BOOL { AST_TBOOL }
| REAL { AST_TREAL }
(* Declarations *)
dbody:
| e=ext(eqn) SEMICOLON { [e] }
| l=body { l }
body:
| LET l=nonempty_list(terminated(ext(eqn), SEMICOLON)) TEL
{ l }
var:
| p=boption(PROBE) i=IDENT { (p, i) }
vari:
| vn=separated_list(COMMA, var) COLON t=typ
{ List.map (fun (p, i) -> (p, i, t)) vn }
vars:
| v=separated_list(SEMICOLON, vari)
{ List.flatten v }
const_decl:
| CONST i=IDENT COLON t=typ EQUAL e=ext(expr) SEMICOLON
{ {
c_name = i;
typ = t;
value = e;
} }
var_decl:
| VAR l=nonempty_list(terminated(vari, SEMICOLON))
{ List.flatten l }
node_kw:
| NODE {}
| FUNCTION {}
node_decl:
| node_kw id=IDENT LPAREN v=vars RPAREN
RETURNS LPAREN rv=vars RPAREN
e = dbody
{ { n_name = id;
args = v;
ret = rv;
var = [];
body = e;
} }
| node_kw id=IDENT LPAREN v=vars RPAREN
RETURNS LPAREN rv=vars RPAREN
lv=var_decl
b=body
{ { n_name = id;
args = v;
ret = rv;
var = lv;
body = b;
} }
(* Utility : add extent information *)
%inline ext(X):
| x=X { x, ($startpos, $endpos) }
%%
|
