+ val case
+ : ?out_lexing : Tiger.Parser.token list
+ -> ?out_parsing : Tiger.Absyn.t
+ -> code : string
+ -> string
+ -> t
+
+ val run : t list -> unit
+end = struct
+ type t =
+ { name : string
+ ; code : string
+ ; out_lexing : (Tiger.Parser.token list) option
+ ; out_parsing : Tiger.Absyn.t option
+ }
+
+ type color =
+ | Red
+ | Yellow
+ | Green
+
+
+ let color_to_ansi_code = function
+ | Red -> "\027[0;31m"
+ | Yellow -> "\027[0;33m"
+ | Green -> "\027[0;32m"
+
+ let color color string =
+ let color_on = color_to_ansi_code color in
+ let color_off = "\027[0m" in
+ sprintf "%s%s%s" color_on string color_off
+
+ let case ?(out_lexing) ?(out_parsing) ~code name =
+ { name
+ ; code
+ ; out_lexing
+ ; out_parsing
+ }
+
+ let bar_sep = String.make 80 '-'
+ let bar_end = String.make 80 '='
+
+ let indent =
+ let unit_spaces = 2 in
+ fun n ->
+ String.make (n * unit_spaces) ' '
+
+ let pass_lexing code : (Tiger.Parser.token list, string) result =
+ let lexbuf = Lexing.from_string code in
+ let rec tokens () =
+ let token = Tiger.Lexer.token lexbuf in
+ (* Avoiding fragile pattern-matching *)
+ if token = Tiger.Parser.EOF then [] else token :: tokens ()
+ in
+ match tokens () with
+ | exception e -> Error (Printexc.to_string e)
+ | tokens -> Ok tokens
+
+ let pass_parsing code =
+ let lb = Lexing.from_string code in
+ match Tiger.Parser.program Tiger.Lexer.token lb with
+ | exception Parsing.Parse_error ->
+ let module L = Lexing in
+ let L.({lex_curr_p = {pos_lnum=l; pos_bol=b; pos_cnum=c; _}; _}) = lb in
+ let msg = sprintf "Syntax error around line: %d, column: %d" l (c - b) in
+ Error msg
+ | ast ->
+ Ok ast
+
+ let s = sprintf
+ let p = printf
+ let p_ln = print_newline
+ let p_indent n = p "%s" (indent n)
+
+ let run tests =
+ let error_count = ref 0 in
+ let run_pass f input output : string * string =
+ match f input with
+ | exception e ->
+ incr error_count;
+ ( s "%s: %s" (color Red "ERROR") (Printexc.to_string e)
+ , "n/a"
+ )
+ | Error msg ->
+ incr error_count;
+ ( s "%s: %s" (color Red "ERROR") msg
+ , "n/a"
+ )
+ | Ok produced ->
+ let exe = s "%s" (color Green "OK") in
+ let out =
+ match
+ Option.map output (fun expected -> expected = produced)
+ with
+ | None ->
+ s "%s" (color Yellow "n/a")
+ | Some true ->
+ s "%s" (color Green "OK")
+ | Some false ->
+ incr error_count;
+ s "%s" (color Red "ERROR")
+ in
+ (exe, out)
+ in
+ List.iter tests ~f:(
+ fun {name; code; out_lexing; out_parsing} ->
+ let ( lexing_exe, lexing_out) = run_pass pass_lexing code out_lexing in
+ let (parsing_exe, parsing_out) = run_pass pass_parsing code out_parsing in
+ p "%s" bar_sep; p_ln ();
+ p "Test: %S" name; p_ln ();
+ p_indent 1; p "Lexing:"; p_ln ();
+ p_indent 2; p "exe: %s" lexing_exe; p_ln ();
+ p_indent 2; p "out: %s" lexing_out; p_ln ();
+ p_indent 1; p "Parsing:"; p_ln ();
+ p_indent 2; p "exe: %s" parsing_exe; p_ln ();
+ p_indent 2; p "out: %s" parsing_out; p_ln ();
+ );
+ p "%s" bar_end; p_ln ();
+ exit !error_count
+end
+
+let test_cases_from_book =
+ [ Test.case
+ "Book test 1: an array type and an array variable"
+ ~code:
+ " \
+ /* an array type and an array variable */ \
+ let \
+ type arrtype = array of int \
+ var arr1:arrtype := \
+ arrtype [10] of 0 \
+ in \
+ arr1 \
+ end \
+ "
+ ~out_lexing:(
+ let open Tiger.Parser in
+ [ LET;
+ TYPE; ID "arrtype"; EQ; ARRAY; OF; ID "int";
+ VAR; ID "arr1"; COLON; ID "arrtype"; ASSIGN;
+ ID "arrtype"; LBRACK; INT 10; RBRACK; OF; INT 0;
+ IN;
+ ID "arr1";
+ END
+ ]
+ )
+ ; Test.case
+ "Book test 2: arr1 is valid since expression 0 is int = myint"
+ ~code:
+ " \
+ /* arr1 is valid since expression 0 is int = myint */ \
+ let \
+ type myint = int \
+ type arrtype = array of myint \
+ var arr1:arrtype := \
+ arrtype [10] of 0 \
+ in \
+ arr1 \
+ end \
+ "
+ ~out_lexing:(
+ let open Tiger.Parser in
+ [ LET;
+ TYPE; ID "myint"; EQ; ID "int";
+ TYPE; ID "arrtype"; EQ; ARRAY; OF; ID "myint";
+ VAR; ID "arr1"; COLON; ID "arrtype"; ASSIGN;
+ ID "arrtype"; LBRACK; INT 10; RBRACK; OF; INT 0;
+ IN;
+ ID "arr1";
+ END
+ ]
+ )
+ ; Test.case
+ "Book test 3: a record type and a record variable"
+ ~code:
+ " \
+ /* a record type and a record variable */ \
+ let \
+ type rectype = \
+ { name : string \
+ , age : int \
+ } \
+ var rec1 : rectype := \
+ rectype \
+ { name = \"Nobody\" \
+ , age = 1000 \
+ } \
+ in \
+ rec1.name := \"Somebody\"; \
+ rec1 \
+ end \
+ "
+ ~out_lexing:(
+ let open Tiger.Parser in
+ [ LET;
+ TYPE; ID "rectype"; EQ;
+ LBRACE; ID "name"; COLON; ID "string";
+ COMMA; ID "age"; COLON; ID "int";
+ RBRACE;
+ VAR; ID "rec1"; COLON; ID "rectype"; ASSIGN;
+ ID "rectype";
+ LBRACE; ID "name"; EQ; STRING "Nobody";
+ COMMA; ID "age"; EQ; INT 1000;
+ RBRACE;
+ IN;
+ ID "rec1"; DOT; ID "name"; ASSIGN; STRING "Somebody"; SEMICOLON;
+ ID "rec1";
+ END
+ ]
+ )
+ ; Test.case
+ "Book test 4: define a recursive function"
+ ~code:
+ " \
+ /* define a recursive function */ \
+ let \
+ \
+ /* calculate n! */ \
+ function nfactor(n: int): int = \
+ if n = 0 \
+ then 1 \
+ else n * nfactor(n-1) \
+ \
+ in \
+ nfactor(10) \
+ end \
+ "
+ ~out_lexing:(
+ let open Tiger.Parser in
+ [ LET;
+ FUNCTION; ID "nfactor"; LPAREN; ID "n"; COLON; ID "int"; RPAREN; COLON; ID "int"; EQ;
+ IF; ID "n"; EQ; INT 0;
+ THEN; INT 1;
+ ELSE; ID "n"; TIMES; ID "nfactor"; LPAREN; ID "n"; MINUS; INT 1; RPAREN;
+ IN;
+ ID "nfactor"; LPAREN; INT 10; RPAREN;
+ END
+ ]
+ )
+ ; Test.case
+ "Book test 9: error : types of then - else differ"
+ ~code:
+ " \
+ /* error : types of then - else differ */ \
+ if (5>4) then 13 else \" \" \
+ "
+ ~out_lexing:(
+ let open Tiger.Parser in
+ [ IF; LPAREN; INT 5; GT; INT 4; RPAREN; THEN; INT 13; ELSE; STRING " "
+ ]
+ )
+ ]
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