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|
%{
open Ast
module Sset = Set.Make(String)
let type_names = ref Sset.empty
%}
%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
%right UNARY
%left RARROW DOT LPAREN
%start <unit> prog
%%
prog:
INCLUDE_IOSTREAM?
decls = declaration*
EOF
{ () }
;
declaration:
| d = decl_vars
{ d }
| d = decl_class
{ d }
| p = proto
b = block
{ () }
;
decl_vars:
| t = ty
vars = separated_nonempty_list(COMMA, var)
SEMICOLON
{ () }
;
decl_class:
| CLASS i = IDENT
s = supers?
LBRACE
PUBLIC COLON
m = member*
RBRACE SEMICOLON
{ () }
;
supers:
| COLON
s = separated_nonempty_list(COMMA, preceded(PUBLIC, TIDENT))
{ s }
;
member:
| d = decl_vars
{ () }
| v = boption(VIRTUAL)
p = proto
{ () }
;
proto:
| t = ty
qv = qvar
LPAREN args = separated_list(COMMA, argument) RPAREN
{ () }
| qi = TIDENT
LPAREN args = separated_list(COMMA, argument) RPAREN
{ () }
| qa = TIDENT DOUBLECOLON
qb = TIDENT
LPAREN args = separated_list(COMMA, argument) RPAREN
{ () }
;
ty:
| VOID
{ () }
| INT
{ () }
| i = TIDENT
{ i }
;
argument:
| t = ty
v = var
{ () }
;
var:
| i = IDENT
{ () }
| TIMES v = var
{ () }
| REF v = var
{ () }
;
qvar:
| qi = qident
{ qi }
| TIMES v = qvar
{ () }
| REF v = qvar
{ () }
;
qident:
| i = IDENT
{ () }
| i = IDENT DOUBLECOLON j = IDENT
{ () }
;
expression:
| i = INTVAL { EIntConst(i) }
| THIS { EThis }
| FALSE { EBoolConst(false) }
| TRUE { EBoolConst(true) }
| NULL { ENull }
| q = qident { () }
| TIMES expression { EUnary(Deref, e) } %prec UNARY
| e1 = expression DOT e2 = IDENT { () }
| e1 = expression RARROW e2 = IDENT { () }
| e1 = expression ASSIGN e2 = expression { () }
| f = expression LPAREN
a = separated_list(COLON, expression)
{ () }
| NEW c = IDENT LPAREN
a = separated_list(COLON, expression)
{ () }
| INCR e = expression { EUnary(PreIncr, e) } %prec UNARY
| DECR e = expression { EUnary(PreDecr, e) } %prec UNARY
| e = expression INCR { EUnary(PostIncr, e) } %prec UNARY
| e = expression DECR { EUnary(PostDecr, e) } %prec UNARY
| REF e = expression { EUnary(Ref, e) } %prec UNARY
| NOT e = expression { EUnary(Not, e) } %prec UNARY
| MINUS e = expression { EUnary(Minus, e) } %prec UNARY
| PLUS e = expression { EUnary(Plus, e) } %prec UNARY
| e1 = expression
o = operator
e2 = expression
{ EBinop(e1, o, e2) }
| LPAREN e = expression RPAREN { e }
;
operator:
| EQ { Equal }
| NE { NotEqual }
| LT { Lt }
| LE { Le }
| GT { Gt }
| GE { Ge }
| PLUS { Add }
| MINUS { Sub }
| TIMES { Mul }
| DIV { Div }
| MOD { Modulo }
| LAND { Land }
| LOR { Lor }
;
instruction:
| SEMICOLON
{ () }
| e = expression SEMICOLON
{ () }
| t = ty
v = var
ASSIGN e = expression? SEMICOLON
{ IDeclVar(t, v, e) }
| t = ty
v = var
ASSIGN cl = TIDENT
LPAREN e = separated_list(COMMA, expression) RPAREN
SEMICOLON
{ IDeclVarAssignConstruct (t, v, cl, e) }
| IF LPAREN e = expression RPAREN i = instruction
{ IIf(e, i, IEmpty) }
| IF LPAREN e = expression RPAREN i1 = instruction
ELSE i2 = instruction
{ IIf(e, i1, i2) }
| WHILE LPAREN e = expression RPAREN i = instruction
{ IWhile(e, i) }
| FOR LPAREN
start = separated_list(COMMA, expression) SEMICOLON
cond = expression? SEMICOLON
loop = separated_list(COMMA, expression) RPAREN
i = instruction
{ IFor(start, cond, loop, i) }
| b = block
{ IBlock(b) }
| STD_COUT
e = preceded(LFLOW, expr_str)+
SEMICOLON
{ IStdCoutWrite(e) }
| RETURN e = expression? SEMICOLON
{ IReturn(e) }
;
expr_str:
| e = expression
{ SEExpr(e) }
| s = STRVAL
{ SEStr(s) }
;
block:
| LBRACE
i = instruction*
RBRACE
{ i }
;
|
