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Assign precedence and associativity to ELSE
[tiger.ml.git]
/
tiger
/
src
/
lib
/
tiger
/
tiger_parser.mly
diff --git
a/tiger/src/lib/tiger/tiger_parser.mly
b/tiger/src/lib/tiger/tiger_parser.mly
index
fee8888
..
625632f
100644
(file)
--- a/
tiger/src/lib/tiger/tiger_parser.mly
+++ b/
tiger/src/lib/tiger/tiger_parser.mly
@@
-49,6
+49,9
@@
%token WHILE
/* from lowest precedence */
%token WHILE
/* from lowest precedence */
+%left ELSE
+%nonassoc ASSIGN
+%left OF DO
%left OR
%left AND
%nonassoc EQ NEQ GT LT GE LE
%left OR
%left AND
%nonassoc EQ NEQ GT LT GE LE
@@
-68,6
+71,7
@@
program:
{
sprintf "program[%s]" $1
}
{
sprintf "program[%s]" $1
}
+ ;
exp:
| NIL
exp:
| NIL
@@
-85,9
+89,11
@@
exp:
| ID LBRACK exp RBRACK OF exp
{
let type_id = $1 in
| ID LBRACK exp RBRACK OF exp
{
let type_id = $1 in
- let exp_1 = $3 in
- let exp_2 = $6 in
- sprintf "array[type[%s], size[%s], val[%s]]" type_id exp_1 exp_2
+ let number_of_elements = $3 in
+ let initial_value = $6 in
+ sprintf
+ "array[type[%s], size[%s], val[%s]]"
+ type_id number_of_elements initial_value
}
| ID LBRACE rec_field_assignments RBRACE
{
}
| ID LBRACE rec_field_assignments RBRACE
{
@@
-166,6
+172,7
@@
exp:
(* Perhaps "void"? *)
"unit[]"
}
(* Perhaps "void"? *)
"unit[]"
}
+ ;
rec_field_assignments:
| ID EQ exp
rec_field_assignments:
| ID EQ exp
@@
-181,16
+188,21
@@
rec_field_assignments:
let rec_field_assignments = $5 in
sprintf "%S = %s, %s" id exp rec_field_assignments
}
let rec_field_assignments = $5 in
sprintf "%S = %s, %s" id exp rec_field_assignments
}
+ ;
exps:
| exp
{
exps:
| exp
{
- sprintf "%s" $1
+ let exp = $1 in
+ sprintf "%s" exp
}
| exp SEMICOLON exps
{
}
| exp SEMICOLON exps
{
- sprintf "%s; %s" $1 $3
+ let exp = $1 in
+ let exps = $3 in
+ sprintf "%s; %s" exp exps
}
}
+ ;
decs:
| dec
decs:
| dec
@@
-201,6
+213,7
@@
decs:
{
sprintf "%s %s" $1 $2
}
{
sprintf "%s %s" $1 $2
}
+ ;
dec:
/* Tydec */
dec:
/* Tydec */
@@
-267,6
+280,7
@@
dec:
"fundec[%s, tyfields[%s], type_id[%s], exp[%s]]"
id tyfields type_id exp
}
"fundec[%s, tyfields[%s], type_id[%s], exp[%s]]"
id tyfields type_id exp
}
+ ;
tyfields:
| ID COLON ID
tyfields:
| ID COLON ID
@@
-283,6
+297,7
@@
tyfields:
let tyfields = $5 in
sprintf "%s, %s" tyfield tyfields
}
let tyfields = $5 in
sprintf "%s, %s" tyfield tyfields
}
+ ;
fun_args:
| exp
fun_args:
| exp
@@
-293,6
+308,7
@@
fun_args:
{
sprintf "%s, %s" $1 $3
}
{
sprintf "%s, %s" $1 $3
}
+ ;
op:
| PLUS {"+"}
op:
| PLUS {"+"}
@@
-307,24
+323,37
@@
op:
| LE {"<="}
| AND {"&"}
| OR {"|"}
| LE {"<="}
| AND {"&"}
| OR {"|"}
+ ;
lvalue:
lvalue:
- | ID
+ | ID
lvalue_part
{
let id = $1 in
{
let id = $1 in
- sprintf "lvalue[%s]" id
+ let part = $2 in
+ sprintf "lvalue[%s, part[%s]]" id part
}
}
- | lvalue DOT ID
+ ;
+
+lvalue_part:
+ | {"epsilon[]"}
+ | lvalue_subscript {$1}
+ | lvalue_field_access {$1}
+ ;
+
+lvalue_subscript:
+ | LBRACK exp RBRACK
{
{
- let record = $1 in
- let field = $3 in
- sprintf "get_record_field[%s, %s]" record field
+ let exp = $2 in
+ sprintf "subscript[%s]" exp
}
}
- | lvalue LBRACK exp RBRACK
+ ;
+
+lvalue_field_access:
+ | DOT ID
{
{
- let array = $1 in
- let subscript = $3 in
- sprintf "get_array_subscript[%s, %s]" array subscript
+ let field = $2 in
+ sprintf "field_access[%s]" field
}
}
+ ;
%%
%%
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