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implemented the define syntax of the form (define (f x y) ...)

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hyung-hwan 2014-02-11 16:05:30 +00:00
parent 9a426594a3
commit 21b0dd665f
1 changed files with 213 additions and 35 deletions
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214
lib/h2-scheme-execute-evaluate.adb
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@ -74,7 +74,79 @@ procedure Evaluate is
procedure Evaluate_Case_Syntax is procedure Evaluate_Case_Syntax is
pragma Inline (Evaluate_Case_Syntax); pragma Inline (Evaluate_Case_Syntax);
Synlist: Object_Pointer;
Ptr1: Object_Pointer;
Ptr2: Object_Pointer;
Ptr3: Object_Pointer;
begin begin
-- (case <key> <clause 1> <clause 2> ...)
-- <key> is an expression.
-- <clause> should be of the form:
-- ((<datum 1> ...) <expression 1> <expression 2> ...)
-- the last <clause> may be an else clause of the form:
-- (else <expression 1> <expression 2> ...)
--
-- (case (* 2 3)
-- ((2 3 5 7) 'prime)
-- ((1 4 6 8 9) 'composite))
--
-- (case (car '(c d))
-- ((a e i o u) 'vowel)
-- ((w y) 'semivowel)
-- (else 'consonant))
--
Synlist := Operand;
Operand := Get_Cdr(Operand); -- Skip "case"
if (Interp.State and Force_Syntax_Check) /= 0 or else
(Synlist.Flags and Syntax_Checked) = 0 then
if Not Is_Cons(Operand) then
-- e.g) (case)
-- (case . 10)
Ada.Text_IO.Put_LINE ("NO KEY FOR CASE");
raise Syntax_Error;
end if;
--Key := Get_Car(Operand);
Ptr1 := Get_Cdr(Operand); -- <clause> list.
while Is_Cons(Ptr1) loop
Ptr2 := Get_Car(Ptr1); -- <clause>
if Get_Last_Cdr(Ptr2) /= Nil_Pointer then
Ada.Text_IO.Put_Line ("FUCKING CDR FOR CASE CLAUSE");
raise Syntax_Error;
end if;
Ptr3 := Get_Car(Ptr2); -- <datum>
if Is_Cons(Ptr3) then
if Get_Last_Cdr(Ptr3) /= Nil_Pointer then
Ada.Text_IO.Put_LINE ("FUCKING CDR FOR CASE DATUM");
raise Syntax_Error;
end if;
elsif Ptr3 = Interp.Else_Symbol then
-- check <test>. if it's else, it should be in the last clause.
if Is_Cons(Get_Cdr(Ptr1)) then
Ada.Text_IO.Put_Line ("ELSE NOT IN THE LAST CASE CLAUSE");
raise Syntax_Error;
end if;
else
Ada.Text_IO.Put_LINE ("INVALID DATUM FOR CASE");
raise Syntax_Error;
end if;
Ptr1 := Get_Cdr(Ptr1); -- next <clause> list
end loop;
if Ptr1 /= Nil_Pointer then
Ada.Text_IO.Put_Line ("FUCKING LAST CLAUSE FOR CASE");
raise Syntax_Error;
end if;
Synlist.Flags := Synlist.Flags or Syntax_Checked;
end if;
Ada.Text_IO.Put_LINE ("UNIMPLEMENTED"); Ada.Text_IO.Put_LINE ("UNIMPLEMENTED");
raise Evaluation_Error; raise Evaluation_Error;
end Evaluate_Case_Syntax; end Evaluate_Case_Syntax;
@ -123,6 +195,15 @@ procedure Evaluate is
Ada.Text_IO.Put_Line ("FUCKING CDR FOR COND CLAUSE"); Ada.Text_IO.Put_Line ("FUCKING CDR FOR COND CLAUSE");
raise Syntax_Error; raise Syntax_Error;
end if; end if;
if Get_Car(Ptr2) = Interp.Else_Symbol then
-- check <test>. if it's else, it should be in the last clause.
if Is_Cons(Get_Cdr(Ptr1)) then
Ada.Text_IO.Put_Line ("ELSE NOT IN THE LAST COND CLAUSE");
raise Syntax_Error;
end if;
end if;
Ptr1 := Get_Cdr(Ptr1); -- next <clause> list Ptr1 := Get_Cdr(Ptr1); -- next <clause> list
exit when not Is_Cons(Ptr1); exit when not Is_Cons(Ptr1);
end loop; end loop;
@ -144,17 +225,27 @@ procedure Evaluate is
procedure Evaluate_Define_Syntax is procedure Evaluate_Define_Syntax is
pragma Inline (Evaluate_Define_Syntax); pragma Inline (Evaluate_Define_Syntax);
Synlist: Object_Pointer; Synlist: Object_Pointer;
Ptr: Object_Pointer; Ptr1: Object_Pointer;
Ptr2: Object_Pointer;
Ptr3: Object_Pointer;
Ptr4: Object_Pointer;
begin begin
-- TODO: limit the context where define can be used. -- TODO: limit the context where define can be used.
-- (define x 10) -- (define <variable> <expression>)
-- (define (add x y) (+ x y)) -> (define add (lambda (x y) (+ x y))) -- (define (<variable> <formals>) <body>)
-- (define (<variable> . <formal>) <body>)
--
-- e.g)
-- (define x 10)
-- (define (add x y) (+ x y)) -> (define add (lambda (x y) (+ x y)))
Synlist := Operand; Synlist := Operand;
Operand := Get_Cdr(Operand); -- Skip "define" Operand := Get_Cdr(Operand); -- Skip "define"
if (Interp.State and Force_Syntax_Check) /= 0 or else if (Interp.State and Force_Syntax_Check) /= 0 or else
(Synlist.Flags and Syntax_Checked) = 0 then (Synlist.Flags and Syntax_Checked) = 0 then
if not Is_Cons(Operand) or else not Is_Cons(Get_Cdr(Operand)) then if not Is_Cons(Operand) or else not Is_Cons(Get_Cdr(Operand)) then
-- e.g) (define) -- e.g) (define)
-- (define . 10) -- (define . 10)
@ -163,12 +254,60 @@ procedure Evaluate is
raise Syntax_Error; raise Syntax_Error;
end if; end if;
Ptr := Get_Car(Operand); Ptr1 := Get_Car(Operand);
if Is_Cons(Ptr) then if Is_Cons(Ptr1) then
ada.text_io.put_line ("NOT IMPLEMENTED YET"); -- (define (add x y) ...)
raise Syntax_Error;
elsif Is_Symbol(Ptr) then Ptr2 := Get_Car(Ptr1); -- <variable> as a function name
if not Is_Symbol(Ptr2) then
Ada.Text_IO.Put_LINE ("WRONG NAME FOR DEFINE");
raise Syntax_Error;
end if;
Ptr1 := Get_Cdr(Ptr1); -- <formals>
Ptr2 := Ptr1;
while Is_Cons(Ptr2) loop
Ptr3 := Get_Car(Ptr2); -- <formal argument>
if not Is_Symbol(Ptr3) then
Ada.Text_IO.Put_Line ("WRONG FORMAL FOR LAMBDA");
raise Syntax_Error;
end if;
-- Check for a duplication formal argument
-- TODO: make duplication check optional or change the implementation more efficient so that this check is not repeated
Ptr4 := Ptr1;
while Ptr4 /= Ptr2 loop
if Get_Car(Ptr4) = Ptr3 then
Ada.Text_IO.Put_Line ("DUPLICATE FORMAL FOR DEFINE");
raise Syntax_Error;
end if;
Ptr4 := Get_Cdr(Ptr4);
end loop;
-- Move on to the next formal argument
Ptr2 := Get_Cdr(Ptr2);
exit when not Is_Cons(Ptr2);
end loop;
if Ptr2 /= Nil_Pointer and then not Is_Symbol(Ptr2) then
Ada.Text_IO.Put_Line ("FUCKING CDR IN FORMALS FOR DEFINE");
raise Syntax_Error;
end if;
Ptr1 := Get_Cdr(Operand); -- <body>
if not Is_Cons(Ptr1) then
Ada.Text_IO.Put_Line ("NO BODY");
raise Syntax_Error;
end if;
if Get_Last_Cdr(Ptr1) /= Nil_Pointer then
-- (lambda (x y) (+ x y) . 99)
Ada.Text_IO.Put_Line ("FUCKING CDR IN BODY FOR LAMBDA");
raise Syntax_Error;
end if;
elsif Is_Symbol(Ptr1) then
if Get_Cdr(Get_Cdr(Operand)) /= Nil_Pointer then if Get_Cdr(Get_Cdr(Operand)) /= Nil_Pointer then
Ada.Text_IO.Put_LINE ("TOO MANY ARGUMENTS FOR DEFINE"); Ada.Text_IO.Put_LINE ("TOO MANY ARGUMENTS FOR DEFINE");
raise Syntax_Error; raise Syntax_Error;
@ -178,25 +317,34 @@ raise Syntax_Error;
raise Syntax_Error; raise Syntax_Error;
end if; end if;
Synlist.Flags := Synlist.Flags or Syntax_Checked; Synlist.Flags := Synlist.Flags or Syntax_Checked;
end if; end if;
Ptr := Get_Car(Operand); Ptr1 := Get_Car(Operand);
if Is_Cons(Ptr) then if Is_Cons(Ptr1) then
-- define a function: (define (add x y) ...) -- define a function: (define (add x y) ...)
ada.text_io.put_line ("NOT IMPLEMENTED YET"); -- Get_Car(Ptr1) -- <variable>
raise Syntax_Error; -- Get_Cdr(Ptr1) -- <formals>
-- Get_Cdr(Operand) -- <body>
-- It's ok to not reload but switch because no continuation
-- can be created in this form of 'define'.
Switch_Frame (Interp.Stack, Opcode_Define_Finish, Get_Car(Ptr1), Nil_Pointer);
-- Make closure and set it as a frame result. Note this is done
-- after switching in order to avoid GC problems withoug using
-- Push_Top/Pop_Tops.
Ptr2 := Make_Cons(Interp.Self, Get_Cdr(Ptr1), Get_Cdr(Operand));
Ptr2 := Make_Closure(Interp.Self, Ptr2, Get_Frame_Environment(Interp.Stack));
Set_Frame_Result (Interp.Stack, Ptr2);
else else
-- define a symbol: (define x ...) -- define a symbol: (define x ...)
pragma Assert (Is_Symbol(Ptr)); pragma Assert (Is_Symbol(Ptr1));
-- Arrange to finish defining after value evaluation -- Arrange to finish defining after value evaluation
-- and to evaluate the value part. -- and to evaluate the value part.
--Switch_Frame (Interp.Stack, Opccode_Define_Finish, Ptr);
--Push_Frame (Interp, Opcode_Evaluate_Object, Get_Car(Get_Cdr(Operand)));
Switch_Frame (Interp.Stack, Opcode_Evaluate_Object, Get_Car(Get_Cdr(Operand)), Nil_Pointer); Switch_Frame (Interp.Stack, Opcode_Evaluate_Object, Get_Car(Get_Cdr(Operand)), Nil_Pointer);
Push_Subframe (Interp, Opcode_Define_Finish, Ptr); Push_Subframe (Interp, Opcode_Define_Finish, Ptr1);
end if; end if;
end Evaluate_Define_Syntax; end Evaluate_Define_Syntax;
@ -204,7 +352,38 @@ raise Syntax_Error;
procedure Evaluate_Do_Syntax is procedure Evaluate_Do_Syntax is
pragma Inline (Evaluate_Do_Syntax); pragma Inline (Evaluate_Do_Syntax);
Synlist: Object_Pointer;
begin begin
-- (do <bindings> <clause> <body>)
-- <bindings> should be of the form: ((<variable 1> <init 1> <step 1>) ...)
-- <clause> should be of the form: (<test> <expression> ...)
-- <body> is zero or more expressions.
--
-- (let ((x '(1 3 5 7 9)))
-- (do ((x x (cdr x))
-- (sum 0 (+ sum (car x)))) ; <bindings>
-- ((null? x) sum) ; <clause>. if <test> is true, exit do with sum.
-- )
-- )
--
-- (do ((i 0 (+ i 1)))
-- ((= i 5) i)
-- (display i) ; <body> downwards
-- (newline)
-- )
Synlist := Operand;
Operand := Get_Cdr(Operand); -- Skip "do"
if (Interp.State and Force_Syntax_Check) /= 0 or else
(Synlist.Flags and Syntax_Checked) = 0 then
Ada.Text_IO.Put_LINE ("UNIMPLEMENTED");
raise Evaluation_Error;
Synlist.Flags := Synlist.Flags or Syntax_Checked;
end if;
Ada.Text_IO.Put_LINE ("UNIMPLEMENTED"); Ada.Text_IO.Put_LINE ("UNIMPLEMENTED");
raise Evaluation_Error; raise Evaluation_Error;
end Evaluate_Do_Syntax; end Evaluate_Do_Syntax;
@ -263,7 +442,6 @@ raise Syntax_Error;
Synlist.Flags := Synlist.Flags or Syntax_Checked; Synlist.Flags := Synlist.Flags or Syntax_Checked;
end if; end if;
-- Arrange to evaluate <consequent> or <alternate> after <test> -- Arrange to evaluate <consequent> or <alternate> after <test>
-- evaluation and to evaluate <test>. Use Switch_Frame/Push_Subframe -- evaluation and to evaluate <test>. Use Switch_Frame/Push_Subframe
-- instead of Switch_Frame/Push_Frame for continuation to work. -- instead of Switch_Frame/Push_Frame for continuation to work.