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interpreter.ml
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module StrMap = Map.Make (String)
type token =
| NAME of string | CD | CWD | ENV | OUTOFBOUNDS of int
| FUN of string | ENDFUN | CONTINUE | RUN | DIR | ISDIR
| INT of int | TONUM | DICT | KEYS | ELIF | IS
| FLOAT of float | DICTIONARY of (string, token) Hashtbl.t
| BOOL of bool | SCAN_ERR | TONUM_ERR of string
| CHAR of char | TOCHAR | NOT_FOUND of string | EXISTS
| STR of string | TOSTR | UNDEFINED of string | EOF
| INCHAN of in_channel | OPENIN | CLOSE | CATCH | THROW
| OUTCHAN of out_channel | OPENOUT | READ | WRITE
| ARRAY of token array | ARR | DREF | FLOOR | CEIL
| LET | GLET | PRINT | PRINTLN | POSTFIX_INCR | POSTFIX_DECR
| IF | ELSE | ENDIF | WHILE | ENDWHILE | FOR | ENDFOR
| NEWLINE | ERROR of string | LIST of token list | SEQ | RETURN
| UNOP_MINUS | NOT | POW | PREFIX_INCR | PREFIX_DECR
| PLUS | MINUS | MULT | DIV | MOD | SCAN | LEN | INCLUDE | EXP
| START | END | BR_START | BR_END | BREAK | RAND | FREE | SQRT
| AND | OR | GREATER | LESS | GEQ | LEQ | NEQ | EQ | LN | LOG | ABS
| B_AND | B_OR | B_XOR | B_NOT | B_SHIFTL | B_LSHIFTR | B_ASHIFTR
| SIN | COS | TAN | ASIN | ACOS | ATAN | SINH | COSH | TANH
exception InvalidToken of (token * string)
exception InvalidFunction of string
exception InvalidFilename of string
let rec string_of_token (tok : token) = (
let print_list (l : token list) = (
let rec loop l buf = (
match l with
| [hd] -> (buf ^ (string_of_token hd))
| hd :: tl -> loop tl (buf ^ (string_of_token hd) ^ ", ")
| [] -> buf
) in
("[" ^ (loop l "") ^ "]")
) in
match tok with
| NAME s -> ("NAME " ^ s)
| FUN s -> ("FUN " ^ s)
| GLET -> "GLET"
| ENDFUN -> "ENDFUN"
| INT i -> ("INT " ^ string_of_int i)
| TONUM -> "TONUM"
| FLOAT f -> ("FLOAT " ^ string_of_float f)
| BOOL b -> ("BOOL " ^ string_of_bool b)
| CHAR c -> ("CHAR " ^ String.make 1 c)
| TOCHAR -> "TOCHAR"
| STR s -> ("STRING " ^ s)
| TOSTR -> "TOSTR"
| INCHAN _ -> "INCHAN"
| OPENIN -> "OPENIN"
| CLOSE -> "CLOSE"
| CATCH -> "CATCH"
| THROW -> "THROW"
| OUTCHAN _ -> "OUTCHAN"
| OPENOUT -> "OPENOUT"
| READ -> "READ"
| WRITE -> "WRITE"
| ARRAY _ -> "ARRAY"
| ARR -> "ARR"
| DREF -> "DREF"
| FLOOR -> "FLOOR"
| CEIL -> "CEIL"
| LET -> "LET"
| PRINT -> "PRINT"
| PRINTLN -> "PRINTLN"
| POSTFIX_INCR -> "POSTFIX_INCR"
| POSTFIX_DECR -> "POSTFIX_DECR"
| IF -> "IF"
| ELSE -> "ELSE"
| ENDIF -> "ENDIF"
| WHILE -> "WHILE"
| ENDWHILE -> "ENDWHILE"
| FOR -> "FOR"
| ENDFOR -> "ENDFOR"
| NEWLINE -> "NEWLINE"
| ERROR s -> ("ERROR " ^ s)
| LIST l -> ("LIST " ^ (print_list l))
| SEQ -> "SEQ"
| RETURN -> "RETURN"
| UNOP_MINUS -> "UNOP_MINUS"
| NOT -> "NOT"
| POW -> "POW"
| PREFIX_INCR -> "PREFIX_INCR"
| PREFIX_DECR -> "PREFIX_DECR"
| PLUS -> "PLUS"
| MINUS -> "MINUS"
| MULT -> "MULT"
| DIV -> "DIV"
| MOD -> "MOD"
| SCAN -> "SCAN"
| LEN -> "LEN"
| INCLUDE -> "INCLUDE"
| START -> "START"
| END -> "END"
| BR_START -> "BR_START"
| BR_END -> "BR_END"
| BREAK -> "BREAK"
| RAND -> "RAND"
| AND -> "AND"
| OR -> "OR"
| GREATER -> "GREATER"
| LESS -> "LESS"
| GEQ -> "GEQ"
| LEQ -> "LEQ"
| NEQ -> "NEQ"
| EQ -> "EQ"
| B_AND -> "B_AND"
| B_OR -> "B_OR"
| B_XOR -> "B_XOR"
| B_NOT -> "B_NOT"
| B_SHIFTL -> "B_SHIFTL"
| B_LSHIFTR -> "B_LSHIFTR"
| B_ASHIFTR -> "B_ASHIFTR"
| SIN -> "SIN"
| COS -> "COS"
| TAN -> "TAN"
| ASIN -> "ASIN"
| ACOS -> "ACOS"
| ATAN -> "ATAN"
| LN -> "LN"
| LOG -> "LOG"
| SQRT -> "SQRT"
| ABS -> "ABS"
| EXP -> "EXP"
| FREE -> "FREE"
| SINH -> "SINH"
| COSH -> "COSH"
| TANH -> "TANH"
| UNDEFINED s -> ("UNDEFINED " ^ s)
| NOT_FOUND s -> ("NOT_FOUND " ^ s)
| EOF -> "EOF"
| EXISTS -> "EXISTS"
| SCAN_ERR -> "SCAN_ERR"
| TONUM_ERR s -> ("TONUM_ERR" ^ s)
| DICTIONARY _ -> "DICTIONARY"
| DICT -> "DICT"
| KEYS -> "KEYS"
| ELIF -> "ELIF"
| CONTINUE -> "CONTINUE"
| CD -> "CD"
| CWD -> "CWD"
| ENV -> "ENV"
| RUN -> "RUN"
| DIR -> "DIR"
| ISDIR -> "ISDIR"
| IS -> "IS"
| OUTOFBOUNDS i -> ("OUTOFBOUNDS " ^ (string_of_int i))
)
let tokenizer (stack : char list) = (
let sep (c : char) = (
match c with
| ' ' | '\n' | ';' | '\t' | '!'
| '(' | '[' | '+' | '-' | '~'
| '|' | '&' | '>' | '<' | '^' -> true
| _ -> false
) in
let postfix (c : char) = (
match c with
| 'A'..'Z' | 'a'..'z' | ']' -> true
| _ -> false
) in
let rec ignore_token = (
function
| NEWLINE :: stack -> NEWLINE :: stack
| hd :: tl -> ignore_token tl
| [] -> []
) in
let rec num_token (buffer : string) = (
function
| hd :: tl when hd = 'b' || hd = 'x' || hd = 'o' || hd = '.'
|| hd >= 'A' && hd <= 'F'
|| hd >= 'a' && hd <= 'f'
|| hd >= '0' && hd <= '9' ->
num_token ((String.make 1 hd) ^ buffer) tl
| stack ->
try
INT (int_of_string buffer), stack
with exn ->
try
FLOAT (float_of_string buffer), stack
with exn -> ERROR ("at num_token: " ^ buffer ^ " is NaN!"), stack
) in
let char_token = (
function
| '\\' :: '\\' :: '\'' :: stack -> CHAR '\\', stack
| '\"' :: '\\' :: '\'' :: stack -> CHAR '\"', stack
| '\'' :: '\\' :: '\'' :: stack -> CHAR '\'', stack
| 'n' :: '\\' :: '\'' :: stack -> CHAR '\n', stack
| 'r' :: '\\' :: '\'' :: stack -> CHAR '\r', stack
| 't' :: '\\' :: '\'' :: stack -> CHAR '\t', stack
| 'b' :: '\\' :: '\'' :: stack -> CHAR '\b', stack
| c :: '\'' :: stack -> CHAR c, stack
| stack -> ERROR "at char_token", stack
) in
let rec str_token (buffer : string) = (
function
| '\\' :: '\\' :: tl -> str_token ((String.make 1 '\\') ^ buffer) tl
| '\"' :: '\\' :: tl -> str_token ((String.make 1 '\"') ^ buffer) tl
| '\'' :: '\\' :: tl -> str_token ((String.make 1 '\'') ^ buffer) tl
| 'n' :: '\\' :: tl -> str_token ((String.make 1 '\n') ^ buffer) tl
| 'r' :: '\\' :: tl -> str_token ((String.make 1 '\r') ^ buffer) tl
| 't' :: '\\' :: tl -> str_token ((String.make 1 '\t') ^ buffer) tl
| 'b' :: '\\' :: tl -> str_token ((String.make 1 '\b') ^ buffer) tl
| '\n' :: tl | '\r' :: tl
| '\t' :: tl | '\b' :: tl -> str_token buffer tl
| '"' :: stack -> STR buffer, stack
| hd :: tl -> str_token ((String.make 1 hd) ^ buffer) tl
| [] -> ERROR "at str_token", []
) in
let rec name_token (buffer : string) (input : char list) = (
match input with
| ('0'..'9' as d) :: c :: _ when sep c ->
let buffer = String.make 1 d in
ERROR ("at name_token: " ^ buffer ^ " cannot start with number!"), input
| c :: _ when sep c -> NAME buffer, input
| 'x' :: '0' :: tl ->
num_token ("0x" ^ buffer) tl
| '_' :: c :: tl when c >= 'A' && c <= 'Z'
|| c >= 'a' && c <= 'z'
|| c >= '0' && c <= '9' ->
name_token ((String.make 1 c) ^ "_" ^ buffer) tl
| hd :: tl when hd >= 'A' && hd <= 'Z'
|| hd >= 'a' && hd <= 'z'
|| hd >= '0' && hd <= '9' ->
name_token ((String.make 1 hd) ^ buffer) tl
| stack -> ERROR ("at name_token: " ^ buffer), stack
) in
let rec iterate (buffer : token list) = (
function
| ';' :: stack ->
iterate (SEQ :: buffer) stack
| '\n' :: stack ->
iterate (NEWLINE :: buffer) stack
| ']' :: stack ->
iterate (BR_END :: buffer) stack
| '[' :: stack ->
iterate (BR_START :: buffer) stack
| ')' :: stack ->
iterate (END :: buffer) stack
| '+' :: '+' :: [] -> (PREFIX_INCR :: buffer)
| '+' :: '+' :: c :: tl when sep c ->
iterate (PREFIX_INCR :: buffer) (c :: tl)
| '+' :: '+' :: c :: tl when postfix c ->
iterate (POSTFIX_INCR :: buffer) (c :: tl)
| '(' :: stack
| '+' :: '(' :: stack ->
iterate (START :: buffer) stack
| '-' :: '-' :: [] -> (PREFIX_DECR :: buffer)
| '-' :: '-' :: c :: tl when sep c ->
iterate (PREFIX_DECR :: buffer) (c :: tl)
| '-' :: '-' :: c :: tl when postfix c ->
iterate (POSTFIX_DECR :: buffer) (c :: tl)
| '-' :: '(' :: stack ->
iterate (START :: UNOP_MINUS :: buffer) stack
| '-' :: stack ->
iterate (MINUS :: buffer) stack
| '+' :: stack ->
iterate (PLUS :: buffer) stack
| '*' :: stack ->
iterate (MULT :: buffer) stack
| '/' :: stack ->
iterate (DIV :: buffer) stack
| '%' :: stack ->
iterate (MOD :: buffer) stack
| '^' :: '^' :: stack ->
iterate (POW :: buffer) stack
| '^' :: stack ->
iterate (B_XOR :: buffer) stack
| '!' :: stack ->
iterate (NOT :: buffer) stack
| '~' :: stack ->
iterate (B_NOT :: buffer) stack
| '|' :: '|' :: stack ->
iterate (OR :: buffer) stack
| '|' :: stack ->
iterate (B_OR :: buffer) stack
| '&' :: '&' :: stack ->
iterate (AND :: buffer) stack
| '&' :: stack ->
iterate (B_AND :: buffer) stack
| '=' :: '>' :: stack ->
iterate (GEQ :: buffer) stack
| '=' :: '<' :: stack ->
iterate (LEQ :: buffer) stack
| '=' :: '!' :: stack ->
iterate (NEQ :: buffer) stack
| '=' :: stack ->
iterate (EQ :: buffer) stack
| '<' :: '<' :: stack ->
iterate (B_SHIFTL :: buffer) stack
| '<' :: stack ->
iterate (LESS :: buffer) stack
| '>' :: '>' :: '>' :: stack ->
iterate (B_ASHIFTR :: buffer) stack
| '>' :: '>' :: stack ->
iterate (B_LSHIFTR :: buffer) stack
| '>' :: stack ->
iterate (GREATER :: buffer) stack
| '#' :: stack ->
iterate (ignore_token buffer) stack
| '\t' :: stack
| ' ' :: stack ->
iterate buffer stack
| '"' :: stack ->
let tok, stack = str_token "" stack in
iterate (tok :: buffer) stack
(* println *)
| 'n' :: 'l' :: 't' :: 'n' :: 'i' :: 'r' :: 'p' :: [] -> (PRINTLN :: buffer)
| 'n' :: 'l' :: 't' :: 'n' :: 'i' :: 'r' :: 'p' :: c :: tl when sep c ->
iterate (PRINTLN :: buffer) (c :: tl)
(* print *)
| 't' :: 'n' :: 'i' :: 'r' :: 'p' :: [] -> (PRINT :: buffer)
| 't' :: 'n' :: 'i' :: 'r' :: 'p' :: c :: tl when sep c ->
iterate (PRINT :: buffer) (c :: tl)
(* let *)
| 't' :: 'e' :: 'l' :: [] -> (LET :: buffer)
| 't' :: 'e' :: 'l' :: c :: tl when sep c ->
iterate (LET :: buffer) (c :: tl)
(* true *)
| 'e' :: 'u' :: 'r' :: 't' :: [] -> (BOOL true :: buffer)
| 'e' :: 'u' :: 'r' :: 't' :: c :: tl when sep c ->
iterate (BOOL true :: buffer) (c :: tl)
(* false *)
| 'e' :: 's' :: 'l' :: 'a' :: 'f' :: [] -> (BOOL false :: buffer)
| 'e' :: 's' :: 'l' :: 'a' :: 'f' :: c :: tl when sep c ->
iterate (BOOL false :: buffer) (c :: tl)
(* elif *)
| 'f' :: 'i' :: 'l' :: 'e' :: [] -> (ELIF :: buffer)
| 'f' :: 'i' :: 'l' :: 'e' :: c :: tl when sep c ->
iterate (ELIF :: buffer) (c :: tl)
(* endif *)
| 'f' :: 'i' :: 'd' :: 'n' :: 'e' :: [] -> (ENDIF :: buffer)
| 'f' :: 'i' :: 'd' :: 'n' :: 'e' :: c :: tl when sep c ->
iterate (ENDIF :: buffer) (c :: tl)
(* if *)
| 'f' :: 'i' :: [] -> (IF :: buffer)
| 'f' :: 'i' :: c :: tl when sep c ->
iterate (IF :: buffer) (c :: tl)
(* else *)
| 'e' :: 's' :: 'l' :: 'e' :: [] -> (ELSE :: buffer)
| 'e' :: 's' :: 'l' :: 'e' :: c :: tl when sep c ->
iterate (ELSE :: buffer) (c :: tl)
(* endwhile *)
| 'e' :: 'l' :: 'i' :: 'h' :: 'w' :: 'd' :: 'n' :: 'e' :: [] -> (ENDWHILE :: buffer)
| 'e' :: 'l' :: 'i' :: 'h' :: 'w' :: 'd' :: 'n' :: 'e' :: c :: tl when sep c ->
iterate (ENDWHILE :: buffer) (c :: tl)
(* while *)
| 'e' :: 'l' :: 'i' :: 'h' :: 'w' :: [] -> (WHILE :: buffer)
| 'e' :: 'l' :: 'i' :: 'h' :: 'w' :: c :: tl when sep c ->
iterate (WHILE :: buffer) (c :: tl)
(* endfun *)
| 'n' :: 'u' :: 'f' :: 'd' :: 'n' :: 'e' :: [] -> (ENDFUN :: buffer)
| 'n' :: 'u' :: 'f' :: 'd' :: 'n' :: 'e' :: c :: tl when sep c ->
iterate (ENDFUN :: buffer) (c :: tl)
(* fun *)
| 'n' :: 'u' :: 'f' :: [] -> (FUN "_DEF_" :: buffer)
| 'n' :: 'u' :: 'f' :: c :: tl when sep c ->
iterate (FUN "_DEF_" :: buffer) (c :: tl)
(* return *)
| 'n' :: 'r' :: 'u' :: 't' :: 'e' :: 'r' :: [] -> (RETURN :: buffer)
| 'n' :: 'r' :: 'u' :: 't' :: 'e' :: 'r' :: c :: tl when sep c ->
iterate (RETURN :: buffer) (c :: tl)
(* arr *)
| 'r' :: 'r' :: 'a' :: [] -> (ARR :: buffer)
| 'r' :: 'r' :: 'a' :: c :: tl when sep c ->
iterate (ARR :: buffer) (c :: tl)
(* endfor *)
| 'r' :: 'o' :: 'f' :: 'd' :: 'n' :: 'e' :: [] -> (ENDFOR :: buffer)
| 'r' :: 'o' :: 'f' :: 'd' :: 'n' :: 'e' :: c :: tl when sep c ->
iterate (ENDFOR :: buffer) (c :: tl)
(* for *)
| 'r' :: 'o' :: 'f' :: [] -> (FOR :: buffer)
| 'r' :: 'o' :: 'f' :: c :: tl when sep c ->
iterate (FOR :: buffer) (c :: tl)
(* break *)
| 'k' :: 'a' :: 'e' :: 'r' :: 'b' :: [] -> (BREAK :: buffer)
| 'k' :: 'a' :: 'e' :: 'r' :: 'b' :: c :: tl when sep c ->
iterate (BREAK :: buffer) (c :: tl)
(* scan *)
| 'n' :: 'a' :: 'c' :: 's' :: [] -> (SCAN :: buffer)
| 'n' :: 'a' :: 'c' :: 's' :: c :: tl when sep c ->
iterate (SCAN :: buffer) (c :: tl)
(* len *)
| 'n' :: 'e' :: 'l' :: [] -> (LEN :: buffer)
| 'n' :: 'e' :: 'l' :: c :: tl when sep c ->
iterate (LEN :: buffer) (c :: tl)
(* rand *)
| 'd' :: 'n' :: 'a' :: 'r' :: [] -> (RAND :: buffer)
| 'd' :: 'n' :: 'a' :: 'r' :: c :: tl when sep c ->
iterate (RAND :: buffer) (c :: tl)
(* floor *)
| 'r' :: 'o' :: 'o' :: 'l' :: 'f' :: [] -> (FLOOR :: buffer)
| 'r' :: 'o' :: 'o' :: 'l' :: 'f' :: c :: tl when sep c ->
iterate (FLOOR :: buffer) (c :: tl)
(* ceil *)
| 'l' :: 'i' :: 'e' :: 'c' :: [] -> (CEIL :: buffer)
| 'l' :: 'i' :: 'e' :: 'c' :: c :: tl when sep c ->
iterate (CEIL :: buffer) (c :: tl)
(* include *)
| 'e' :: 'd' :: 'u' :: 'l' :: 'c' :: 'n' :: 'i' :: [] -> (INCLUDE :: buffer)
| 'e' :: 'd' :: 'u' :: 'l' :: 'c' :: 'n' :: 'i' :: c :: tl when sep c ->
iterate (INCLUDE :: buffer) (c :: tl)
(* tonum *)
| 'm' :: 'u' :: 'n' :: 'o' :: 't' :: [] -> (TONUM :: buffer)
| 'm' :: 'u' :: 'n' :: 'o' :: 't' :: c :: tl when sep c ->
iterate (TONUM :: buffer) (c :: tl)
(* openin *)
| 'n' :: 'i' :: 'n' :: 'e' :: 'p' :: 'o' :: [] -> (OPENIN :: buffer)
| 'n' :: 'i' :: 'n' :: 'e' :: 'p' :: 'o' :: c :: tl when sep c ->
iterate (OPENIN :: buffer) (c :: tl)
(* openout *)
| 't' :: 'u' :: 'o' :: 'n' :: 'e' :: 'p' :: 'o' :: [] -> (OPENOUT :: buffer)
| 't' :: 'u' :: 'o' :: 'n' :: 'e' :: 'p' :: 'o' :: c :: tl when sep c ->
iterate (OPENOUT :: buffer) (c :: tl)
(* close *)
| 'e' :: 's' :: 'o' :: 'l' :: 'c' :: [] -> (CLOSE :: buffer)
| 'e' :: 's' :: 'o' :: 'l' :: 'c' :: c :: tl when sep c ->
iterate (CLOSE :: buffer) (c :: tl)
(* read *)
| 'd' :: 'a' :: 'e' :: 'r' :: [] -> (READ :: buffer)
| 'd' :: 'a' :: 'e' :: 'r' :: c :: tl when sep c ->
iterate (READ :: buffer) (c :: tl)
(* write *)
| 'e' :: 't' :: 'i' :: 'r' :: 'w' :: [] -> (WRITE :: buffer)
| 'e' :: 't' :: 'i' :: 'r' :: 'w' :: c :: tl when sep c ->
iterate (WRITE :: buffer) (c :: tl)
(* throw *)
| 'w' :: 'o' :: 'r' :: 'h' :: 't' :: [] -> (THROW :: buffer)
| 'w' :: 'o' :: 'r' :: 'h' :: 't' :: c :: tl when sep c ->
iterate (THROW :: buffer) (c :: tl)
(* catch *)
| 'h' :: 'c' :: 't' :: 'a' :: 'c' :: [] -> (CATCH :: buffer)
| 'h' :: 'c' :: 't' :: 'a' :: 'c' :: c :: tl when sep c ->
iterate (CATCH :: buffer) (c :: tl)
(* tochar *)
| 'r' :: 'a' :: 'h' :: 'c' :: 'o' :: 't' :: [] -> (TOCHAR :: buffer)
| 'r' :: 'a' :: 'h' :: 'c' :: 'o' :: 't' :: c :: tl when sep c ->
iterate (TOCHAR :: buffer) (c :: tl)
(* tostr *)
| 'r' :: 't' :: 's' :: 'o' :: 't' :: [] -> (TOSTR :: buffer)
| 'r' :: 't' :: 's' :: 'o' :: 't' :: c :: tl when sep c ->
iterate (TOSTR :: buffer) (c :: tl)
(* sinh *)
| 'h' :: 'n' :: 'i' :: 's' :: [] -> (SINH :: buffer)
| 'h' :: 'n' :: 'i' :: 's' :: c :: tl when sep c ->
iterate (SINH :: buffer) (c :: tl)
(* asin *)
| 'n' :: 'i' :: 's' :: 'a' :: [] -> (ASIN :: buffer)
| 'n' :: 'i' :: 's' :: 'a' :: c :: tl when sep c ->
iterate (ASIN :: buffer) (c :: tl)
(* sin *)
| 'n' :: 'i' :: 's' :: [] -> (SIN :: buffer)
| 'n' :: 'i' :: 's' :: c :: tl when sep c ->
iterate (SIN :: buffer) (c :: tl)
(* cosh *)
| 'h' :: 's' :: 'o' :: 'c' :: [] -> (COSH :: buffer)
| 'h' :: 's' :: 'o' :: 'c' :: c :: tl when sep c ->
iterate (COSH :: buffer) (c :: tl)
(* acos *)
| 's' :: 'o' :: 'c' :: 'a' :: [] -> (ACOS :: buffer)
| 's' :: 'o' :: 'c' :: 'a' :: c :: tl when sep c ->
iterate (ACOS :: buffer) (c :: tl)
(* cos *)
| 's' :: 'o' :: 'c' :: [] -> (COS :: buffer)
| 's' :: 'o' :: 'c' :: c :: tl when sep c ->
iterate (COS :: buffer) (c :: tl)
(* tanh *)
| 'h' :: 'n' :: 'a' :: 't' :: [] -> (TANH :: buffer)
| 'h' :: 'n' :: 'a' :: 't' :: c :: tl when sep c ->
iterate (TANH :: buffer) (c :: tl)
(* atan *)
| 'n' :: 'a' :: 't' :: 'a' :: [] -> (ATAN :: buffer)
| 'n' :: 'a' :: 't' :: 'a' :: c :: tl when sep c ->
iterate (ATAN :: buffer) (c :: tl)
(* tan *)
| 'n' :: 'a' :: 't' :: [] -> (TAN :: buffer)
| 'n' :: 'a' :: 't' :: c :: tl when sep c ->
iterate (TAN :: buffer) (c :: tl)
(* abs *)
| 's' :: 'b' :: 'a' :: [] -> (ABS :: buffer)
| 's' :: 'b' :: 'a' :: c :: tl when sep c ->
iterate (ABS :: buffer) (c :: tl)
(* sqrt *)
| 't' :: 'r' :: 'q' :: 's' :: [] -> (SQRT :: buffer)
| 't' :: 'r' :: 'q' :: 's' :: c :: tl when sep c ->
iterate (SQRT :: buffer) (c :: tl)
(* log *)
| 'g' :: 'o' :: 'l' :: [] -> (LOG :: buffer)
| 'g' :: 'o' :: 'l' :: c :: tl when sep c ->
iterate (LOG :: buffer) (c :: tl)
(* ln *)
| 'n' :: 'l' :: [] -> (LN :: buffer)
| 'n' :: 'l' :: c :: tl when sep c ->
iterate (LN :: buffer) (c :: tl)
(* exp *)
| 'p' :: 'x' :: 'e' :: [] -> (EXP :: buffer)
| 'p' :: 'x' :: 'e' :: c :: tl when sep c ->
iterate (EXP :: buffer) (c :: tl)
(* free *)
| 'e' :: 'e' :: 'r' :: 'f' :: [] -> (FREE :: buffer)
| 'e' :: 'e' :: 'r' :: 'f' :: c :: tl when sep c ->
iterate (FREE :: buffer) (c :: tl)
(* exists *)
| 's' :: 't' :: 's' :: 'i' :: 'x' :: 'e' :: [] -> (EXISTS :: buffer)
| 's' :: 't' :: 's' :: 'i' :: 'x' :: 'e' :: c :: tl when sep c ->
iterate (EXISTS :: buffer) (c :: tl)
(* dict *)
| 't' :: 'c' :: 'i' :: 'd' :: [] -> (DICT :: buffer)
| 't' :: 'c' :: 'i' :: 'd' :: c :: tl when sep c ->
iterate (DICT :: buffer) (c :: tl)
(* keys *)
| 's' :: 'y' :: 'e' :: 'k' :: [] -> (KEYS :: buffer)
| 's' :: 'y' :: 'e' :: 'k' :: c :: tl when sep c ->
iterate (KEYS :: buffer) (c :: tl)
(* continue *)
| 'e' :: 'u' :: 'n' :: 'i' :: 't' :: 'n' :: 'o' :: 'c' :: [] -> (CONTINUE :: buffer)
| 'e' :: 'u' :: 'n' :: 'i' :: 't' :: 'n' :: 'o' :: 'c' :: c :: tl when sep c ->
iterate (CONTINUE :: buffer) (c :: tl)
(* cd *)
| 'd' :: 'c' :: [] -> (CD :: buffer)
| 'd' :: 'c' :: c :: tl when sep c ->
iterate (CD :: buffer) (c :: tl)
(* cwd *)
| 'd' :: 'w' :: 'c' :: [] -> (CWD :: buffer)
| 'd' :: 'w' :: 'c' :: c :: tl when sep c ->
iterate (CWD :: buffer) (c :: tl)
(* env *)
| 'v' :: 'n' :: 'e' :: [] -> (ENV :: buffer)
| 'v' :: 'n' :: 'e' :: c :: tl when sep c ->
iterate (ENV :: buffer) (c :: tl)
(* run *)
| 'n' :: 'u' :: 'r' :: [] -> (RUN :: buffer)
| 'n' :: 'u' :: 'r' :: c :: tl when sep c ->
iterate (RUN :: buffer) (c :: tl)
(* define *)
| 'e' :: 'n' :: 'i' :: 'f' :: 'e' :: 'd' :: [] -> (GLET :: buffer)
| 'e' :: 'n' :: 'i' :: 'f' :: 'e' :: 'd' :: c :: tl when sep c ->
iterate (GLET :: buffer) (c :: tl)
(* isdir *)
| 'r' :: 'i' :: 'd' :: 's' :: 'i' :: [] -> (ISDIR :: buffer)
| 'r' :: 'i' :: 'd' :: 's' :: 'i' :: c :: tl when sep c ->
iterate (ISDIR :: buffer) (c :: tl)
(* dir *)
| 'r' :: 'i' :: 'd' :: [] -> (DIR :: buffer)
| 'r' :: 'i' :: 'd' :: c :: tl when sep c ->
iterate (DIR :: buffer) (c :: tl)
(* is *)
| 's' :: 'i' :: [] -> (IS :: buffer)
| 's' :: 'i' :: c :: tl when sep c ->
iterate (IS :: buffer) (c :: tl)
| '\'' :: tl ->
let tok, stack = char_token tl in
iterate (tok :: buffer) stack
| '.' :: c :: stack when c >= '0' && c <= '9' ->
let tok, stack = num_token "" ('.' :: c :: stack) in
iterate (tok :: buffer) stack
| c :: stack when c >= '0' && c <= '9' ->
let tok, stack = num_token "" (c :: stack) in
iterate (tok :: buffer) stack
| ('a'..'z' as c) :: stack
| ('A'..'Z' as c) :: stack ->
let tok, stack = name_token "" (c :: stack) in
iterate (tok :: buffer) stack
| c :: stack ->
iterate (ERROR (String.make 1 c) :: buffer) stack
| [] ->
buffer
) in
iterate [] stack
)
let char_stack (f : in_channel) = (
let rec loop stack = (
match input_char f with
| c -> loop (c :: stack)
| exception End_of_file -> close_in f; stack
) in
loop []
)
let find_file (name : string) = (
let rec iter = (
function
| hd :: tl -> (
match open_in (hd ^ "/" ^ name) with
| exception _ -> iter tl
| file -> file
)
| [] -> raise (InvalidFilename name)
) in
try open_in name
with _ ->
match Sys.getenv_opt "PATH" with
| Some s -> String.split_on_char ':' s |> iter
| None -> raise (InvalidFilename name)
)
let interpreter (tokens : token list) (arg_offset : int) = (
let rec iterate (input : token list)
(vars : token StrMap.t)
(funs : (int * string list * token list * string list) StrMap.t) = (
let rec rpn (input : token list) (stack : token list) (output : token list) = (
let rec precedence (op : token) (stack : token list) (output : token list) = (
let higher_order (op : token) (stack_op : token) = (
let get_lvl (op : token) = (
match op with
| FUN _ | POSTFIX_DECR | POSTFIX_INCR -> 0
| LEN | RAND | UNOP_MINUS | OPENIN | CLOSE | READ | EXISTS
| NOT | FLOOR | CEIL | TONUM | OPENOUT | CATCH | SQRT | ENV
| POW | PREFIX_DECR | PREFIX_INCR | B_NOT | ABS | KEYS| CD
| TOSTR | TOCHAR | LOG | LN | ASIN | ACOS | ATAN | CWD | DIR
| ISDIR | SINH | COSH | TANH | SIN | COS | TAN | EXP | SCAN -> 1
| MULT | DIV | MOD | IS -> 2
| PLUS | MINUS -> 3
| B_SHIFTL | B_ASHIFTR | B_LSHIFTR -> 4
| LESS | LEQ | GREATER | GEQ -> 5
| NEQ | EQ -> 6
| B_AND -> 7
| B_XOR -> 8
| B_OR -> 9
| AND -> 10
| OR -> 11
| LET | GLET | PRINT | PRINTLN | RETURN
| WRITE | THROW | FREE | RUN -> 12
| tok -> raise (InvalidToken (tok, "at higher_order"))
) in
get_lvl op < get_lvl stack_op
) in
match stack with
| [] ->
[op], output
| stack_op :: tl -> (
match op , stack_op with
(* Special cases with parentheses and brackets *)
| END , START -> tl, output
| BR_END , BR_START -> tl, (DREF :: output)
| END , _
| BR_END , _ -> precedence op tl (stack_op :: output)
| START , _
| BR_START, _
| _ , START
| _ , BR_START -> (op :: stack), output
| op , stack_op ->
if higher_order op stack_op
then (op :: stack), output
else precedence op tl (stack_op :: output)
)
) in
match input with
| []
| SEQ :: _
| NEWLINE :: _ -> (
match stack with
| [] -> (List.rev output), input
| hd :: tl -> rpn input tl (hd :: output)
)
| NAME n :: tl when StrMap.mem n funs ->
rpn tl (FUN n :: stack) output
| NAME _ | STR _ | INT _
| FLOAT _ | BOOL _ | CHAR _
| DICT | ARR as hd :: tl -> rpn tl stack (hd :: output)
| op :: tl ->
let stack, output = precedence op stack output in
rpn tl stack output
) in
let strip_if (stack : token list) = (
let rec loop (stack : token list) (cnt : int) = (
match stack with
| IF :: stack -> loop stack (cnt + 1)
| ELIF :: stack when cnt = 1 -> (IF :: stack)
| ELSE :: stack when cnt = 1 -> stack
| ENDIF :: stack when cnt = 1 -> stack
| ENDIF :: stack -> loop stack (cnt - 1)
| _ :: stack -> loop stack cnt
| [] -> []
) in
loop stack 1
) in
let strip_else (stack : token list) = (
let rec loop (stack : token list) (buffer : token list) (cnt : int) = (
if cnt > 0 then
match stack with
| IF :: tl -> loop tl buffer (cnt + 1)
| ENDIF :: tl -> loop tl buffer (cnt - 1)
| _ :: tl -> loop tl buffer cnt
| [] -> []
else
match buffer with
| hd :: tl -> loop (hd :: stack) tl cnt
| [] -> stack
) in
let rec store_if (input : token list) (buffer : token list) (cnt : int) = (
match input with
| IF :: tl -> store_if tl (IF :: buffer) (cnt + 1)
| ELIF :: tl when cnt = 1 -> loop tl buffer 1
| ELSE :: tl when cnt = 1 -> loop tl buffer 1
| ENDIF :: tl when cnt = 1 -> stack
| ENDIF :: tl -> store_if tl (ENDIF :: buffer) (cnt - 1)
| hd :: tl -> store_if tl (hd :: buffer) cnt
| [] -> []
) in
store_if stack [] 1
) in
let copy_while (stack : token list) = (
let rec strip_while (stack : token list) (buffer : token list) (cnt : int) = (
match stack with
| WHILE :: tl -> strip_while tl (WHILE :: buffer) (cnt + 1)
| ENDWHILE :: tl when cnt = 1 -> List.rev buffer, tl
| ENDWHILE :: tl -> strip_while tl (ENDWHILE :: buffer) (cnt - 1)
| hd :: tl -> strip_while tl (hd :: buffer) cnt
| [] -> raise (InvalidToken (LIST [], "at copy_while"))
) in
strip_while stack [] 1
) in
let copy_for (stack : token list) = (
let rec strip_for (stack : token list) (buffer : token list) (cnt : int) = (
match stack with
| FOR :: tl -> strip_for tl (FOR :: buffer) (cnt + 1)
| ENDFOR :: tl when cnt = 1 -> List.rev buffer, tl
| ENDFOR :: tl -> strip_for tl (ENDFOR :: buffer) (cnt - 1)
| hd :: tl -> strip_for tl (hd :: buffer) cnt
| [] -> raise (InvalidToken (LIST [], "at copy_for"))
) in
strip_for stack [] 1
) in
let store_fun (input : token list) = (
let rec parse_args (input : token list) (output : string list) (counter : int) = (
match input with
| NEWLINE :: input
| SEQ :: input -> input, counter, output
| NAME n :: input -> parse_args input (n :: output) (counter + 1)
| _ -> raise (InvalidFunction "at parse_args")
) in
let rec skip_fun (input : token list) (output : token list)
(locals : string list) (counter : int) = (
match input with
| FUN "_DEF_" as hd :: tl -> skip_fun tl (hd :: output) locals (counter + 1)
| ENDFUN :: tl when counter = 1 -> tl, List.rev output, locals
| ENDFUN as hd :: tl -> skip_fun tl (hd :: output) locals (counter - 1)
| LET :: NAME n :: tl when counter = 1 ->
skip_fun tl (LET :: NAME n :: output) (n :: locals) counter
| hd :: tl -> skip_fun tl (hd :: output) locals counter
| [] -> raise (InvalidFunction "at skip_fun")
) in
let (input, argc, argv) = parse_args input [] 0 in
let (output, sequence, locals) = skip_fun input [] [] 1 in
(argc, argv, sequence, locals), output
) in
let rec eval_rpn (input : token list) (vars : token StrMap.t) (stack : token list) = (
let dref (stack : token list) (n : int) = (
let rec loop (stack : token list) (buffer : token list) (index : int) = (
if index < n then
match stack with
| INT i :: ARRAY a :: stack -> (
match a.(i) with
| elem -> loop stack (elem :: buffer) (index + 1)
| exception _ -> loop stack (OUTOFBOUNDS i :: buffer) (index + 1)
)
| STR s :: DICTIONARY d :: stack -> (
match Hashtbl.find d s with
| elem -> loop stack (elem :: buffer) (index + 1)
| exception Not_found -> loop stack (UNDEFINED s :: buffer) (index + 1)
)
| NAME a :: stack -> (
let elem = (
match StrMap.find_opt a vars with
| Some elem -> elem
| None -> (
match StrMap.find_opt ("_GLOBAL_" ^ a) funs with
| Some (_, _, [elem], _) -> elem
| _ -> UNDEFINED a
)
) in loop stack (elem :: buffer) (index + 1)
)
| hd :: tl -> loop tl (hd :: buffer) (index + 1)
| [] -> loop [] buffer n
else
match buffer with
| hd :: tl -> loop (hd :: stack) tl index
| [] -> stack
) in
loop stack [] 0
) in
match input with
| NAME _ | STR _ | INT _
| FLOAT _ | BOOL _ | CHAR _
| ARR | DICT as hd :: tl -> eval_rpn tl vars (hd :: stack)
| op :: input -> (
match op with
| LET -> (
let stack = dref stack 1 in
match stack with
| v :: NAME n :: stack ->
eval_rpn input (StrMap.add n v (StrMap.remove n vars)) (v :: stack)
| v :: INT i :: ARRAY a :: stack -> (
match a.(i) with
| exception _ -> eval_rpn input vars (OUTOFBOUNDS i :: stack)
| _ -> a.(i) <- v; eval_rpn input vars (v :: stack)
)
| v :: STR s :: DICTIONARY d :: stack ->
Hashtbl.replace d s v; eval_rpn input vars (v :: stack)
| INT size :: ARR :: NAME n :: stack ->
let arr = ARRAY (Array.make size (INT 0)) in
eval_rpn input (StrMap.add n arr (StrMap.remove n vars)) (arr :: stack)
| INT size :: ARR :: INT i :: ARRAY a :: stack -> (
match a.(i) with
| exception _ -> eval_rpn input vars (OUTOFBOUNDS i :: stack)
| _ ->
let arr = ARRAY (Array.make size (INT 0)) in
a.(i) <- arr; eval_rpn input vars (arr :: stack)
)
| INT size :: ARR :: STR s :: DICTIONARY d :: stack ->
let arr = ARRAY (Array.make size (INT 0)) in
Hashtbl.replace d s arr; eval_rpn input vars (arr :: stack)
| INT size :: DICT :: NAME n :: stack ->
let dict = DICTIONARY (Hashtbl.create size) in
eval_rpn input (StrMap.add n dict (StrMap.remove n vars)) (dict :: stack)
| INT size :: DICT :: INT i :: ARRAY a :: stack -> (
match a.(i) with
| exception _ -> eval_rpn input vars (OUTOFBOUNDS i :: stack)
| _ ->
let dict = DICTIONARY (Hashtbl.create size) in
a.(i) <- dict; eval_rpn input vars (dict :: stack)
)
| INT size :: DICT :: STR s :: DICTIONARY d :: stack ->
let dict = DICTIONARY (Hashtbl.create size) in
Hashtbl.replace d s dict; eval_rpn input vars (dict :: stack)
| stack -> raise (InvalidToken (LIST stack, "at LET"))
)
| SCAN -> (
match stack with
| NAME "int" :: stack ->
(try INT (read_int ()) with _ -> SCAN_ERR) :: stack
|> eval_rpn input vars
| NAME "str" :: stack ->
(try STR (read_line ()) with _ -> SCAN_ERR) :: stack
|> eval_rpn input vars
| NAME "float" :: stack ->
(try Scanf.scanf "%f" (fun f -> FLOAT f) with _ -> SCAN_ERR) :: stack
|> eval_rpn input vars
| stack -> raise (InvalidToken (LIST stack, "at SCAN"))
)
| PREFIX_INCR -> (
match stack with
| STR s :: DICTIONARY d :: stack -> (
match Hashtbl.find_opt d s with
| None -> eval_rpn input vars (UNDEFINED s :: stack)
| Some INT i ->
let v = INT (i + 1) in
Hashtbl.replace d s v; eval_rpn input vars (v :: stack)
| Some FLOAT f ->
let v = FLOAT (f +. 1.) in
Hashtbl.replace d s v; eval_rpn input vars (v :: stack)
| Some tok -> raise (InvalidToken (tok, "at PREFIX_INCR (dict)"))
)
| INT i :: ARRAY a :: stack -> (
match a.(i) with
| exception _ -> eval_rpn input vars (OUTOFBOUNDS i :: stack)
| INT j ->
let v = INT (j + 1) in
a.(i) <- v; eval_rpn input vars (v :: stack)
| FLOAT f ->
let v = FLOAT (f +. 1.) in
a.(i) <- v; eval_rpn input vars (v :: stack)
| tok -> raise (InvalidToken (tok, "at PREFIX_INCR (array)"))
)
| NAME n :: stack -> (
let elem = (
match StrMap.find_opt n vars with
| Some elem -> elem
| None -> (
match StrMap.find_opt ("_GLOBAL_" ^ n) funs with
| Some (_, _, [elem], _) -> elem
| _ -> UNDEFINED n
)
) in
match elem with
| UNDEFINED n -> eval_rpn input vars (UNDEFINED n :: stack)
| INT i ->
let v = INT (i + 1) in
eval_rpn input (StrMap.add n v (StrMap.remove n vars)) (v :: stack)
| FLOAT f ->
let v = FLOAT (f +. 1.) in
eval_rpn input (StrMap.add n v (StrMap.remove n vars)) (v :: stack)
| tok -> raise (InvalidToken (tok, "at PREFIX_INCR"))
)
| stack -> raise (InvalidToken (LIST stack, "at PREFIX_INCR"))
)
| PREFIX_DECR -> (
match stack with
| STR s :: DICTIONARY d :: stack -> (
match Hashtbl.find_opt d s with
| None -> eval_rpn input vars (UNDEFINED s :: stack)
| Some INT i ->
let v = INT (i - 1) in
Hashtbl.replace d s v; eval_rpn input vars (v :: stack)
| Some FLOAT f ->
let v = FLOAT (f -. 1.) in
Hashtbl.replace d s v; eval_rpn input vars (v :: stack)
| Some tok -> raise (InvalidToken (tok, "at PREFIX_DECR (dict)"))
)
| INT i :: ARRAY a :: stack -> (
match a.(i) with
| exception _ -> eval_rpn input vars (OUTOFBOUNDS i :: stack)
| INT j ->
let v = INT (j - 1) in
a.(i) <- v; eval_rpn input vars (v :: stack)
| FLOAT f ->
let v = FLOAT (f -. 1.) in
a.(i) <- v; eval_rpn input vars (v :: stack)
| tok -> raise (InvalidToken (tok, "at PREFIX_DECR (array)"))
)
| NAME n :: stack -> (
let elem = (
match StrMap.find_opt n vars with
| Some elem -> elem
| None -> (
match StrMap.find_opt ("_GLOBAL_" ^ n) funs with
| Some (_, _, [elem], _) -> elem
| _ -> UNDEFINED n
)
) in
match elem with
| UNDEFINED n -> eval_rpn input vars (UNDEFINED n :: stack)
| INT i ->
let v = INT (i - 1) in
eval_rpn input (StrMap.add n v (StrMap.remove n vars)) (v :: stack)
| FLOAT f ->
let v = FLOAT (f -. 1.) in
eval_rpn input (StrMap.add n v (StrMap.remove n vars)) (v :: stack)
| tok -> raise (InvalidToken (tok, "at PREFIX_DECR"))
)
| stack -> raise (InvalidToken (LIST stack, "at PREFIX_DECR"))
)
| POSTFIX_INCR -> (
match stack with
| STR s :: DICTIONARY d :: stack -> (
match Hashtbl.find_opt d s with
| None -> eval_rpn input vars (UNDEFINED s :: stack)
| Some INT i ->
let v = INT (i + 1) in
Hashtbl.replace d s v; eval_rpn input vars (INT i :: stack)
| Some FLOAT f ->
let v = FLOAT (f +. 1.) in
Hashtbl.replace d s v; eval_rpn input vars (FLOAT f :: stack)
| Some tok -> raise (InvalidToken (tok, "at POSTFIX_INCR (dict)"))
)
| INT i :: ARRAY a :: stack -> (
match a.(i) with
| exception _ -> eval_rpn input vars (OUTOFBOUNDS i :: stack)
| INT j ->
let v = INT (j + 1) in
a.(i) <- v; eval_rpn input vars (INT j :: stack)
| FLOAT f ->
let v = FLOAT (f +. 1.) in
a.(i) <- v; eval_rpn input vars (FLOAT f :: stack)
| tok -> raise (InvalidToken (tok, "at POSTFIX_INCR (array)"))
)
| NAME n :: stack -> (
let elem = (
match StrMap.find_opt n vars with
| Some elem -> elem
| None -> (
match StrMap.find_opt ("_GLOBAL_" ^ n) funs with
| Some (_, _, [elem], _) -> elem
| _ -> UNDEFINED n
)
) in
match elem with
| UNDEFINED n -> eval_rpn input vars (UNDEFINED n :: stack)
| INT i ->
let v = INT (i + 1) in
eval_rpn input (StrMap.add n v (StrMap.remove n vars)) (INT i :: stack)
| FLOAT f ->
let v = FLOAT (f +. 1.) in
eval_rpn input (StrMap.add n v (StrMap.remove n vars)) (FLOAT f :: stack)
| tok -> raise (InvalidToken (tok, "at POSTFIX_INCR"))
)
| stack -> raise (InvalidToken (LIST stack, "at POSTFIX_INCR"))
)
| POSTFIX_DECR -> (
match stack with
| STR s :: DICTIONARY d :: stack -> (
match Hashtbl.find_opt d s with
| None -> eval_rpn input vars (UNDEFINED s :: stack)
| Some INT i ->
let v = INT (i - 1) in
Hashtbl.replace d s v; eval_rpn input vars (INT i :: stack)
| Some FLOAT f ->
let v = FLOAT (f -. 1.) in
Hashtbl.replace d s v; eval_rpn input vars (FLOAT f :: stack)
| Some tok -> raise (InvalidToken (tok, "at POSTFIX_DECR (dict)"))
)
| INT i :: ARRAY a :: stack -> (
match a.(i) with
| exception _ -> eval_rpn input vars (OUTOFBOUNDS i :: stack)
| INT j ->