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|
(*
Langages de Programmation et Compilation (J.-C. Filliatre)
2013-2014
Alex AUVOLAT
Parser for Mini-C++
*)
%{
open Ast
type var =
| VId of ident
| VPtr of var
| VRef of var
let rec reverse_var bt v = match v with
| VId(i) -> i, bt
| VPtr(vv) -> let id, ty = reverse_var bt vv in id, TPtr(ty)
| VRef(vv) -> let id, ty = reverse_var bt vv in id, TRef(ty)
%}
%token <int> INTVAL
%token <string> STRVAL
%token <string> IDENT
%token <string> TIDENT
(* this is stupid *)
%token INCLUDE_IOSTREAM STD_COUT
(* keywords *)
%token CLASS ELSE FALSE FOR IF INT NEW NULL PUBLIC RETURN
%token THIS TRUE VIRTUAL VOID WHILE
(* operators *)
%token ASSIGN LOR LAND EQ NE LT LE GT GE PLUS MINUS
%token TIMES DIV MOD NOT INCR DECR REF
%token LPAREN RPAREN RARROW DOT
(* other symbols *)
%token SEMICOLON COLON DOUBLECOLON LFLOW LBRACE RBRACE COMMA EOF
(* operator priority *)
%right ASSIGN
%left LOR
%left LAND
%left EQ NE
%left LT LE GT GE
%left PLUS MINUS
%left TIMES DIV MOD
%left RARROW DOT LPAREN
%start <Ast.program> prog
%%
prog:
INCLUDE_IOSTREAM?
decls = declaration*
EOF
{ List.flatten decls }
;
declaration:
| ident = typed_var
LPAREN args = typed_var* RPAREN
b = block
{ [ DFunction({p_ret_type = snd ident; p_name = fst ident; p_args = args}, b) ] }
| vars = typed_vars
SEMICOLON
{ List.map (fun k -> DGlobal(k)) vars }
;
typed_var:
| b = base_type
x = var
{ reverse_var b x }
;
typed_vars:
| b = base_type
x = separated_nonempty_list(COMMA, var)
{ List.map (reverse_var b) x }
;
base_type:
| VOID { TVoid }
| INT { TInt }
| t = TIDENT { TIdent(t) }
;
var:
| t = IDENT { VId(t) }
| TIMES v = var { VPtr(v) }
| REF v = var { VRef(v) }
;
block:
| LBRACE
i = statement*
RBRACE
{ i }
;
statement:
| k = common_statement { k }
| IF LPAREN c = expression RPAREN s = statement
{ SIf(c, s, SEmpty) }
| IF LPAREN c = expression RPAREN s = no_if_statement ELSE t = statement
{ SIf(c, s, t) }
| WHILE LPAREN c = expression RPAREN s = statement
{ SWhile(c, s) }
| FOR LPAREN k = separated_list(COMMA, expression) SEMICOLON
c = expression? SEMICOLON
r = separated_list(COMMA, expression) RPAREN
b = statement
{ SFor(k, c, r, b) }
;
no_if_statement:
| WHILE LPAREN c = expression RPAREN s = no_if_statement
{ SWhile(c, s) }
| FOR LPAREN k = separated_list(COMMA, expression) SEMICOLON
c = expression? SEMICOLON
r = separated_list(COMMA, expression) RPAREN
b = no_if_statement
{ SFor(k, c, r, b) }
| c = common_statement { c }
;
common_statement:
| SEMICOLON
{ SEmpty }
| e = expression SEMICOLON { SExpr(e) }
| b = block
{ SBlock (b) }
| RETURN e = expression? SEMICOLON
{ SReturn (e) }
| k = typed_var v = preceded(ASSIGN, expression)? SEMICOLON
{ SDeclare(fst k, snd k, v) }
;
expression:
| e1 = expression ASSIGN e2 = expression { EAssign(e1, e2) }
| a = expression b = binop c = expression { EBinary(a, b, c) }
| a = expression LPAREN arg = separated_list(COMMA, expression) RPAREN { ECall(a, arg) }
| a = unop { a }
;
primary:
| NULL { ENull }
| i = INTVAL { EInt(i) }
| TRUE { EBool(true) }
| FALSE { EBool(false) }
| i = IDENT { EIdent(i) }
| LPAREN e = expression RPAREN { e }
;
%inline binop:
| EQ {Equal }
| NE { NotEqual }
| LAND { Land }
| LOR { Lor }
| GT { Gt }
| GE { Ge }
| LT { Lt }
| LE { Le }
| PLUS { Add }
| MINUS { Sub }
| TIMES { Mul }
| DIV { Div }
| MOD { Modulo }
;
unop:
| e = lunop { e }
| e = unop INCR { EUnary(PostIncr, e) }
| e = unop DECR { EUnary(PostDecr, e) }
;
lunop:
| NOT e = lunop { EUnary(Not, e) }
| MINUS e = lunop { EUnary(Minus, e) }
| PLUS e = lunop { EUnary(Plus, e) }
| REF e = lunop { EUnary(Ref, e) }
| TIMES e = lunop { EUnary(Deref, e) }
| INCR e = lunop { EUnary(PreIncr, e) }
| DECR e = lunop { EUnary(PreDecr, e) }
| e = primary { e }
;
|
