OCaml Code: Please fix all the errors needed for interpreter.ml and use the test cases to test the code. Make sure to give the correct code with the screenshots of the test cases passing the code. interpreter.ml type stackValue = BOOL of bool | INT of int | ERROR | STRING of string | NAME of string | UNIT type command = ADD | SUB | MUL | DIV | PUSH of stackValue | POP | REM | NEG | TOSTRING | SWAP | PRINTLN | QUIT let interpreter (input, output) = let ic = open_in input in let oc = open_out output in let rec loop_read acc = try let l = String.trim (input_line ic) in loop_read (l :: acc) with End_of_file -> List.rev acc in let strList = loop_read [] in let str2sv s = match s with | ":true:" -> BOOL true | ":false:" -> BOOL false | ":error:" -> ERROR | ":unit:" -> UNIT | _ -> let rec try_parse_int str = try INT (int_of_string str) with Failure _ -> try_parse_name str and try_parse_name str = NAME str in try_parse_int s in let str2com s = match s with | "Add" -> ADD | "Sub" -> SUB | "Mul" -> MUL | "Div" -> DIV | "Swap" -> SWAP | "Neg" -> NEG | "Rem" -> REM | "ToString" -> TOSTRING | "Println" -> PRINTLN | "Quit" -> QUIT | _ -> PUSH (str2sv s) in let com2str c = match c with | ADD -> "Add" | SUB -> "Sub" | MUL -> "Mul" | DIV -> "Div" | SWAP -> "Swap" | NEG -> "Neg" | REM -> "Rem" | TOSTRING -> "ToString" | PRINTLN -> "Println" | QUIT -> "Quit" | PUSH sv -> sv2str sv in let sv2str sv = match sv with | BOOL b -> string_of_bool b | INT i -> string_of_int i | ERROR -> ":error:" | STRING s -> s | NAME n -> n | UNIT -> ":unit:" in let rec processor cmds stack = match (cmds, stack) with | (ADD :: restOfCommands, INT a :: INT b :: restOfStack) -> processor restOfCommands (INT (a + b) :: restOfStack) | (ADD :: restOfCommands, _) -> processor restOfCommands (ERROR :: stack) | (SUB :: restOfCommands, INT a :: INT b :: restOfStack) -> processor restOfCommands (INT (a - b) :: restOfStack) | (SUB :: restOfCommands, _) -> processor restOfCommands (ERROR :: stack) | (MUL :: restOfCommands, INT a :: INT b :: restOfStack) -> processor restOfCommands (INT (a * b) :: restOfStack) | (MUL :: restOfCommands, _) -> processor restOfCommands (ERROR :: stack) | (DIV :: restOfCommands, INT a :: INT b :: restOfStack) -> processor restOfCommands (INT (a / b) :: restOfStack) | (DIV :: restOfCommands, _) -> processor restOfCommands (ERROR :: stack) | (REM :: restOfCommands, INT a :: INT b :: restOfStack) -> processor restOfCommands (INT (a mod b) :: restOfStack) | (REM :: restOfCommands, _) -> processor restOfCommands (ERROR :: stack) | (SWAP :: restOfCommands, x :: y :: restOfStack) -> processor restOfCommands (y :: x :: restOfStack) | (SWAP :: restOfCommands, _) -> processor restOfCommands (ERROR :: stack) | (NEG :: restOfCommands, INT a :: restOfStack) -> processor restOfCommands (INT (-a) :: restOfStack) | (NEG :: restOfCommands, _) -> processor restOfCommands (ERROR :: stack) | (TOSTRING :: restOfCommands, x :: restOfStack) -> processor restOfCommands (STRING (sv2str x) :: restOfStack) | (TOSTRING :: restOfCommands, _) -> processor restOfCommands (ERROR :: stack) | (PUSH sv :: restOfCommands, _) -> processor restOfCommands (sv :: stack) | (POP :: restOfCommands, _ :: restOfStack) -> processor restOfCommands restOfStack | (POP :: restOfCommands, _) -> processor restOfCommands (ERROR :: stack) | (PRINTLN :: restOfCommands, STRING s :: restOfStack) -> output_string oc (s ^ "\n"); flush oc; processor restOfCommands restOfStack | (PRINTLN :: restOfCommands, _ :: restOfStack) -> processor restOfCommands (ERROR :: stack) | (QUIT :: _, _) -> () | (_, _) -> () in let comList = List.map str2com strList in let _ = processor comList [] in close_in ic; close_out oc Test cases: input1.txt: push 1 toString println quit output1.txt: 1

OCaml Code: Please fix all the errors needed for interpreter.ml and use the test cases to test the code. Make sure to give the correct code with the screenshots of the test cases passing the code. interpreter.ml type stackValue = BOOL of bool | INT of int | ERROR | STRING of string | NAME of string | UNIT type command = ADD | SUB | MUL | DIV | PUSH of stackValue | POP | REM | NEG | TOSTRING | SWAP | PRINTLN | QUIT let interpreter (input, output) = let ic = open_in input in let oc = open_out output in let rec loop_read acc = try let l = String.trim (input_line ic) in loop_read (l :: acc) with End_of_file -> List.rev acc in let strList = loop_read [] in let str2sv s = match s with | ":true:" -> BOOL true | ":false:" -> BOOL false | ":error:" -> ERROR | ":unit:" -> UNIT | _ -> let rec try_parse_int str = try INT (int_of_string str) with Failure _ -> try_parse_name str and try_parse_name str = NAME str in try_parse_int s in let str2com s = match s with | "Add" -> ADD | "Sub" -> SUB | "Mul" -> MUL | "Div" -> DIV | "Swap" -> SWAP | "Neg" -> NEG | "Rem" -> REM | "ToString" -> TOSTRING | "Println" -> PRINTLN | "Quit" -> QUIT | _ -> PUSH (str2sv s) in let com2str c = match c with | ADD -> "Add" | SUB -> "Sub" | MUL -> "Mul" | DIV -> "Div" | SWAP -> "Swap" | NEG -> "Neg" | REM -> "Rem" | TOSTRING -> "ToString" | PRINTLN -> "Println" | QUIT -> "Quit" | PUSH sv -> sv2str sv in let sv2str sv = match sv with | BOOL b -> string_of_bool b | INT i -> string_of_int i | ERROR -> ":error:" | STRING s -> s | NAME n -> n | UNIT -> ":unit:" in let rec processor cmds stack = match (cmds, stack) with | (ADD :: restOfCommands, INT a :: INT b :: restOfStack) -> processor restOfCommands (INT (a + b) :: restOfStack) | (ADD :: restOfCommands, _) -> processor restOfCommands (ERROR :: stack) | (SUB :: restOfCommands, INT a :: INT b :: restOfStack) -> processor restOfCommands (INT (a - b) :: restOfStack) | (SUB :: restOfCommands, _) -> processor restOfCommands (ERROR :: stack) | (MUL :: restOfCommands, INT a :: INT b :: restOfStack) -> processor restOfCommands (INT (a * b) :: restOfStack) | (MUL :: restOfCommands, _) -> processor restOfCommands (ERROR :: stack) | (DIV :: restOfCommands, INT a :: INT b :: restOfStack) -> processor restOfCommands (INT (a / b) :: restOfStack) | (DIV :: restOfCommands, _) -> processor restOfCommands (ERROR :: stack) | (REM :: restOfCommands, INT a :: INT b :: restOfStack) -> processor restOfCommands (INT (a mod b) :: restOfStack) | (REM :: restOfCommands, _) -> processor restOfCommands (ERROR :: stack) | (SWAP :: restOfCommands, x :: y :: restOfStack) -> processor restOfCommands (y :: x :: restOfStack) | (SWAP :: restOfCommands, _) -> processor restOfCommands (ERROR :: stack) | (NEG :: restOfCommands, INT a :: restOfStack) -> processor restOfCommands (INT (-a) :: restOfStack) | (NEG :: restOfCommands, _) -> processor restOfCommands (ERROR :: stack) | (TOSTRING :: restOfCommands, x :: restOfStack) -> processor restOfCommands (STRING (sv2str x) :: restOfStack) | (TOSTRING :: restOfCommands, _) -> processor restOfCommands (ERROR :: stack) | (PUSH sv :: restOfCommands, _) -> processor restOfCommands (sv :: stack) | (POP :: restOfCommands, _ :: restOfStack) -> processor restOfCommands restOfStack | (POP :: restOfCommands, _) -> processor restOfCommands (ERROR :: stack) | (PRINTLN :: restOfCommands, STRING s :: restOfStack) -> output_string oc (s ^ "\n"); flush oc; processor restOfCommands restOfStack | (PRINTLN :: restOfCommands, _ :: restOfStack) -> processor restOfCommands (ERROR :: stack) | (QUIT :: _, _) -> () | (_, _) -> () in let comList = List.map str2com strList in let _ = processor comList [] in close_in ic; close_out oc Test cases: input1.txt: push 1 toString println quit output1.txt: 1

Database System Concepts

7th Edition

ISBN:9780078022159

Author:Abraham Silberschatz Professor, Henry F. Korth, S. Sudarshan

Publisher:Abraham Silberschatz Professor, Henry F. Korth, S. Sudarshan

Chapter1: Introduction

Section: Chapter Questions

Problem 1PE

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Question

OCaml Code: Please fix all the errors needed for interpreter.ml and use the test cases to test the code. Make sure to give the correct code with the screenshots of the test cases passing the code.

interpreter.ml

type command = ADD | SUB | MUL | DIV | PUSH of stackValue | POP | REM | NEG | TOSTRING | SWAP | PRINTLN | QUIT

let interpreter (input, output) =

let ic = open_in input in

let oc = open_out output in

let rec loop_read acc =

try

let l = String.trim (input_line ic) in

loop_read (l :: acc)

with

End_of_file -> List.rev acc

let strList = loop_read [] in

let str2sv s =

match s with

| ":true:" -> BOOL true

| ":false:" -> BOOL false

| ":error:" -> ERROR

| ":unit:" -> UNIT

| _ ->

let rec try_parse_int str =

try INT (int_of_string str)

with Failure _ -> try_parse_name str

and try_parse_name str = NAME str

try_parse_int s

let str2com s =

match s with

| "Add" -> ADD

| "Sub" -> SUB

| "Mul" -> MUL

| "Div" -> DIV

| "Swap" -> SWAP

| "Neg" -> NEG

| "Rem" -> REM

| "ToString" -> TOSTRING

| "Println" -> PRINTLN

| "Quit" -> QUIT

| _ -> PUSH (str2sv s)

let com2str c =

match c with

| ADD -> "Add"

| SUB -> "Sub"

| MUL -> "Mul"

| DIV -> "Div"

| SWAP -> "Swap"

| NEG -> "Neg"

| REM -> "Rem"

| TOSTRING -> "ToString"

| PRINTLN -> "Println"

| QUIT -> "Quit"

| PUSH sv -> sv2str sv

let sv2str sv =

match sv with

| BOOL b -> string_of_bool b

| INT i -> string_of_int i

| ERROR -> ":error:"

| STRING s -> s

| NAME n -> n

| UNIT -> ":unit:"

let rec processor cmds stack =

match (cmds, stack) with

| (ADD :: restOfCommands, INT a :: INT b :: restOfStack) ->

processor restOfCommands (INT (a + b) :: restOfStack)

| (ADD :: restOfCommands, _) -> processor restOfCommands (ERROR :: stack)

| (SUB :: restOfCommands, INT a :: INT b :: restOfStack) ->

processor restOfCommands (INT (a - b) :: restOfStack)

| (SUB :: restOfCommands, _) -> processor restOfCommands (ERROR :: stack)

| (MUL :: restOfCommands, INT a :: INT b :: restOfStack) ->

processor restOfCommands (INT (a * b) :: restOfStack)

| (MUL :: restOfCommands, _) -> processor restOfCommands (ERROR :: stack)

| (DIV :: restOfCommands, INT a :: INT b :: restOfStack) ->

processor restOfCommands (INT (a / b) :: restOfStack)

| (DIV :: restOfCommands, _) -> processor restOfCommands (ERROR :: stack)

| (REM :: restOfCommands, INT a :: INT b :: restOfStack) ->

processor restOfCommands (INT (a mod b) :: restOfStack)

| (REM :: restOfCommands, _) -> processor restOfCommands (ERROR :: stack)

| (SWAP :: restOfCommands, x :: y :: restOfStack) ->

processor restOfCommands (y :: x :: restOfStack)

| (SWAP :: restOfCommands, _) -> processor restOfCommands (ERROR :: stack)

| (NEG :: restOfCommands, INT a :: restOfStack) ->

processor restOfCommands (INT (-a) :: restOfStack)

| (NEG :: restOfCommands, _) -> processor restOfCommands (ERROR :: stack)

| (TOSTRING :: restOfCommands, x :: restOfStack) ->

processor restOfCommands (STRING (sv2str x) :: restOfStack)

| (TOSTRING :: restOfCommands, _) -> processor restOfCommands (ERROR :: stack)

| (PUSH sv :: restOfCommands, _) -> processor restOfCommands (sv :: stack)

| (POP :: restOfCommands, _ :: restOfStack) -> processor restOfCommands restOfStack

| (POP :: restOfCommands, _) -> processor restOfCommands (ERROR :: stack)

| (PRINTLN :: restOfCommands, STRING s :: restOfStack) ->

output_string oc (s ^ "\n");

flush oc;

processor restOfCommands restOfStack

| (PRINTLN :: restOfCommands, _ :: restOfStack) ->

processor restOfCommands (ERROR :: stack)

| (QUIT :: _, _) -> ()

| (_, _) -> ()

let comList = List.map str2com strList in

let _ = processor comList [] in

close_in ic;

close_out oc

Test cases:

input1.txt:

push 1
toString
println
quit

output1.txt:

### Understanding OCaml: A Simple Interpreter Example

Here we have a snippet of code written in OCaml, a functional programming language. This example is part of a simple stack-based language interpreter, demonstrating some core concepts and syntax of OCaml.

```ocaml
10 type stackValue = BOOL of bool | INT of int | ERROR | STRING of string | NAME of string | UNIT

11 type command = ADD | SUB | MUL | DIV | PUSH of stackValue | POP | REM | NEG | TOSTRING | SWAP | PRINTLN | QUIT

13 let interpreter (input, output) =
14 let ic = open_in input in
15 let oc = open_out output in

17 let rec loop_read acc =
18 try
19 let l = String.trim (input_line ic) in
20 loop_read (l :: acc)
21 with
22 End_of_file -> List.rev acc
23 in
24 let strList = loop_read [] in

26 let str2sv s =
27 match s with
28 | ":true:" -> BOOL true
```

### Explanation:

#### 1. Type Definitions
- **Types:** `stackValue` and `command` are user-defined types.
- `stackValue` can either be a boolean (`BOOL`), integer (`INT`), string (`STRING`), name (`NAME`), an error (`ERROR`), or unit (`UNIT`).
- `command` includes operations like arithmetic (`ADD`, `SUB`, `MUL`, `DIV`), stack manipulation (`PUSH`, `POP`, `SWAP`), and others (`REM`, `NEG`, `TOSTRING`, `PRINTLN`, `QUIT`).

#### 2. Interpreter Function
- **Input/Output channels:** Using `open_in` and `open_out` to open input and output channels respectively for file handling.
```
let interpreter (input, output) =
let ic = open_in input in
let oc = open_out output in
```

#### 3. Reading Lines from File
- It reads lines from the input file in a recursive manner using `loop_read`.
```ocaml
let rec loop_read acc =
try
let l = String.trim (input_line ic) in
loop_read (l :: acc)
with
End_of_file -> List.rev

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