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
Related questions
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 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
![### 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](/v2/_next/image?url=https%3A%2F%2Fcontent.bartleby.com%2Fqna-images%2Fquestion%2Fe7ddc10c-4670-40fd-b02c-6a60c5fcc2f2%2F13761889-820d-49e7-9a52-2a580d861394%2Fgpeq7ph_processed.png&w=3840&q=75)
Transcribed Image Text:### 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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