add brainfuck

README.md

@@ -49,6 +49,7 @@ written in the host language which starts a Prybar-compatible REPL.
 | Ruby 2.5                  | ✔    | ✔               | ✔         | ✔    | ✗              | ✗          |
 | SQLite                    | ✔    | ✔               | ✔         | ✔    | ✗              | ✔          |
 | Tcl                       | ✔    | ✔               | ✔         | ✗    | ✗              | -          |
+| Brainfuck                 | ✔    | ✗               | ✗         | ✗    | ✔              | ✔          |
 
 ## Build and run
 
@@ -88,8 +89,7 @@ repository](languages)):
 
 Run `make image` to create a Docker image containing not only Prybar's
 dependencies and source code but also its compiled binaries, which can
-be embedded inside other Docker images by means of `COPY
---from=basicer/prybar`.
+be embedded inside other Docker images by means of `COPY --from=basicer/prybar`.
 
 This image is automatically built and deployed to [Docker
 Hub](https://hub.docker.com/) every time a commit is merged to

languages/brainfuck/main.go

@@ -0,0 +1,115 @@
+package main
+
+import (
+	"fmt"
+	"os"
+)
+
+// USING_CGO
+
+type Brainfuck struct {
+	tape   []uint8
+	cursor int
+}
+
+func (p *Brainfuck) Open() {
+	p.tape = make([]uint8, 1000)
+}
+
+func (p *Brainfuck) Version() string {
+	return "Brainfuck"
+}
+
+func (p *Brainfuck) Eval(code string) {
+	didPrint := false
+
+	for pc := 0; pc < len(code); pc++ {
+		switch code[pc] {
+		case '>':
+			if p.cursor == len(p.tape)-1 {
+				p.tape = append(p.tape, 0)
+			}
+			p.cursor++
+		case '<':
+			if p.cursor == 0 {
+				fmt.Fprintln(os.Stderr, "Tried to move past the beginning of the tape!")
+				return
+			}
+			p.cursor--
+		case '+':
+			p.tape[p.cursor]++
+		case '-':
+			p.tape[p.cursor]--
+		case '.':
+			fmt.Printf("%c", p.tape[p.cursor])
+			didPrint = true
+		case ',':
+			var b [1]byte
+			_, err := os.Stdin.Read(b[:])
+			if err != nil {
+				b[0] = 0
+			}
+
+			p.tape[p.cursor] = b[0]
+		case '[':
+			if p.tape[p.cursor] == 0 {
+				depth := 0
+				npc := pc + 1
+				for {
+					if npc == len(code) {
+						fmt.Fprintln(os.Stderr, "Couldn't find a matching ']'")
+						return
+					}
+
+					if code[npc] == ']' && depth == 0 {
+						break
+					}
+
+					if code[npc] == '[' {
+						depth++
+					} else if code[npc] == ']' {
+						depth--
+					}
+					npc++
+				}
+
+				pc = npc
+
+			}
+		case ']':
+			if p.tape[p.cursor] != 0 {
+				depth := 0
+				npc := pc - 1
+				for {
+					if npc < 0 {
+						fmt.Fprintln(os.Stderr, "Couldn't find a matching '['")
+						return
+					}
+
+					if code[npc] == '[' && depth == 0 {
+						break
+					}
+
+					if code[npc] == ']' {
+						depth++
+					} else if code[npc] == '[' {
+						depth--
+					}
+
+					npc--
+				}
+
+				pc = npc
+
+			}
+		}
+	}
+
+	if didPrint {
+		fmt.Printf("\n")
+	}
+}
+
+func (p *Brainfuck) Close() {}
+
+var Instance = &Brainfuck{}

test_files/cell_size.bf

@@ -0,0 +1,22 @@
+Calculate the value 256 and test if it's zero
+If the interpreter errors on overflow this is where it'll happen
+++++++++[>++++++++<-]>[<++++>-]
++<[>-<
+    Not zero so multiply by 256 again to get 65536
+    [>++++<-]>[<++++++++>-]<[>++++++++<-]
+    +>[>
+        # Print "32"
+        ++++++++++[>+++++<-]>+.-.[-]<
+    <[-]<->] <[>>
+        # Print "16"
+        +++++++[>+++++++<-]>.+++++.[-]<
+<<-]] >[>
+    # Print "8"
+    ++++++++[>+++++++<-]>.[-]<
+<-]<
+# Print " bit cells\n"
++++++++++++[>+++>+++++++++>+++++++++>+<<<<-]>-.>-.+++++++.+++++++++++.<.
+>>.++.+++++++..<-.>>-
+Clean up used cells.
+[[-]<]
+

test_files/hello_world.bf

@@ -0,0 +1,2 @@
+++++++++[>++++[>++>+++>+++>+<<<<-]>+>+>->>+[<]<-]>>.>---.+++++++..+++.>>.<-.<.+++.------.--------.>>+.>++.
+

tests/brainfuck/cell_size.exp

@@ -0,0 +1,48 @@
+#!/usr/bin/expect -f
+#
+# This Expect script was generated by autoexpect on Thu Jul 15 16:22:11 2021
+# Expect and autoexpect were both written by Don Libes, NIST.
+#
+# Note that autoexpect does not guarantee a working script.  It
+# necessarily has to guess about certain things.  Two reasons a script
+# might fail are:
+#
+# 1) timing - A surprising number of programs (rn, ksh, zsh, telnet,
+# etc.) and devices discard or ignore keystrokes that arrive "too
+# quickly" after prompts.  If you find your new script hanging up at
+# one spot, try adding a short sleep just before the previous send.
+# Setting "force_conservative" to 1 (see below) makes Expect do this
+# automatically - pausing briefly before sending each character.  This
+# pacifies every program I know of.  The -c flag makes the script do
+# this in the first place.  The -C flag allows you to define a
+# character to toggle this mode off and on.
+
+set force_conservative 0  ;# set to 1 to force conservative mode even if
+			  ;# script wasn't run conservatively originally
+if {$force_conservative} {
+	set send_slow {1 .1}
+	proc send {ignore arg} {
+		sleep .1
+		exp_send -s -- $arg
+	}
+}
+
+#
+# 2) differing output - Some programs produce different output each time
+# they run.  The "date" command is an obvious example.  Another is
+# ftp, if it produces throughput statistics at the end of a file
+# transfer.  If this causes a problem, delete these patterns or replace
+# them with wildcards.  An alternative is to use the -p flag (for
+# "prompt") which makes Expect only look for the last line of output
+# (i.e., the prompt).  The -P flag allows you to define a character to
+# toggle this mode off and on.
+#
+# Read the man page for more info.
+#
+# -Don
+
+
+set timeout -1
+spawn ./prybar-brainfuck ./test_files/cell_size.bf
+match_max 100000
+expect eof

tests/brainfuck/hello_world.exp

@@ -0,0 +1,56 @@
+#!/usr/bin/expect -f
+#
+# This Expect script was generated by autoexpect on Thu Jul 15 16:19:06 2021
+# Expect and autoexpect were both written by Don Libes, NIST.
+#
+# Note that autoexpect does not guarantee a working script.  It
+# necessarily has to guess about certain things.  Two reasons a script
+# might fail are:
+#
+# 1) timing - A surprising number of programs (rn, ksh, zsh, telnet,
+# etc.) and devices discard or ignore keystrokes that arrive "too
+# quickly" after prompts.  If you find your new script hanging up at
+# one spot, try adding a short sleep just before the previous send.
+# Setting "force_conservative" to 1 (see below) makes Expect do this
+# automatically - pausing briefly before sending each character.  This
+# pacifies every program I know of.  The -c flag makes the script do
+# this in the first place.  The -C flag allows you to define a
+# character to toggle this mode off and on.
+
+set force_conservative 0  ;# set to 1 to force conservative mode even if
+			  ;# script wasn't run conservatively originally
+if {$force_conservative} {
+	set send_slow {1 .1}
+	proc send {ignore arg} {
+		sleep .1
+		exp_send -s -- $arg
+	}
+}
+
+#
+# 2) differing output - Some programs produce different output each time
+# they run.  The "date" command is an obvious example.  Another is
+# ftp, if it produces throughput statistics at the end of a file
+# transfer.  If this causes a problem, delete these patterns or replace
+# them with wildcards.  An alternative is to use the -p flag (for
+# "prompt") which makes Expect only look for the last line of output
+# (i.e., the prompt).  The -P flag allows you to define a character to
+# toggle this mode off and on.
+#
+# Read the man page for more info.
+#
+# -Don
+
+
+set timeout -1
+spawn ./prybar-brainfuck -I
+match_max 100000
+expect -exact "Brainfuck\r
+\[J\[2K\r-->  "
+send -- "++++++++\[>++++\[>++>+++>+++>+<<<<-\]>+>+>->>+\[<\]<-\]>>.>---.+++++++..+++.>>.<-.<.+++.------.--------.>>+.>++.\r"
+expect -exact "\[J\[2K\r--> +\[J\[2K\r--> ++\[J\[2K\r--> +++\[J\[2K\r--> ++++\[J\[2K\r--> +++++\[J\[2K\r--> ++++++\[J\[2K\r--> +++++++\[J\[2K\r--> ++++++++\[J\[2K\r--> ++++++++\[\[J\[2K\r--> ++++++++\[>\[J\[2K\r--> ++++++++\[>+\[J\[2K\r--> ++++++++\[>++\[J\[2K\r--> ++++++++\[>+++\[J\[2K\r--> ++++++++\[>++++\[J\[2K\r--> ++++++++\[>++++\[\[J\[2K\r--> ++++++++\[>++++\[>\[J\[2K\r--> ++++++++\[>++++\[>+\[J\[2K\r--> ++++++++\[>++++\[>++\[J\[2K\r--> ++++++++\[>++++\[>++>\[J\[2K\r--> ++++++++\[>++++\[>++>+\[J\[2K\r--> ++++++++\[>++++\[>++>++\[J\[2K\r--> ++++++++\[>++++\[>++>+++\[J\[2K\r--> ++++++++\[>++++\[>++>+++>\[J\[2K\r--> ++++++++\[>++++\[>++>+++>+\[J\[2K\r--> ++++++++\[>++++\[>++>+++>++\[J\[2K\r--> ++++++++\[>++++\[>++>+++>+++\[J\[2K\r--> ++++++++\[>++++\[>++>+++>+++>\[J\[2K\r--> ++++++++\[>++++\[>++>+++>+++>+\[J\[2K\r--> ++++++++\[>++++\[>++>+++>+++>+<\[J\[2K\r--> ++++++++\[>++++\[>++>+++>+++>+<<\[J\[2K\r--> ++++++++\[>++++\[>++>+++>+++>+<<<\[J\[2K\r--> ++++++++\[>++++\[>++>+++>+++>+<<<<\[J\[2K\r--> ++++++++\[>++++\[>++>+++>+++>+<<<<-\[J\[2K\r--> ++++++++\[>++++\[>++>+++>+++>+<<<<-\]\[J\[2K\r--> ++++++++\[>++++\[>++>+++>+++>+<<<<-\]>\[J\[2K\r--> ++++++++\[>++++\[>++>+++>+++>+<<<<-\]>+\[J\[2K\r--> ++++++++\[>++++\[>++>+++>+++>+<<<<-\]>+>\[J\[2K\r--> ++++++++\[>++++\[>++>+++>+++>+<<<<-\]>+>+\[J\[2K\r--> ++++++++\[>++++\[>++>+++>+++>+<<<<-\]>+>+>\[J\[2K\r--> ++++++++\[>++++\[>++>+++>+++>+<<<<-\]>+>+>-\[J\[2K\r--> ++++++++\[>++++\[>++>+++>+++>+<<<<-\]>+>+>->\[J\[2K\r--> ++++++++\[>++++\[>++>+++>+++>+<<<<-\]>+>+>->>\[J\[2K\r--> ++++++++\[>++++\[>++>+++>+++>+<<<<-\]>+>+>->>+\[J\[2K\r--> ++++++++\[>++++\[>++>+++>+++>+<<<<-\]>+>+>->>+\[\[J\[2K\r--> ++++++++\[>++++\[>++>+++>+++>+<<<<-\]>+>+>->>+\[<\[J\[2K\r--> ++++++++\[>++++\[>++>+++>+++>+<<<<-\]>+>+>->>+\[<\]\[J\[2K\r--> ++++++++\[>++++\[>++>+++>+++>+<<<<-\]>+>+>->>+\[<\]<\[J\[2K\r--> ++++++++\[>++++\[>++>+++>+++>+<<<<-\]>+>+>->>+\[<\]<-\[J\[2K\r--> ++++++++\[>++++\[>++>+++>+++>+<<<<-\]>+>+>->>+\[<\]<-\]\[J\[2K\r--> ++++++++\[>++++\[>++>+++>+++>+<<<<-\]>+>+>->>+\[<\]<-\]>\[J\[2K\r--> ++++++++\[>++++\[>++>+++>+++>+<<<<-\]>+>+>->>+\[<\]<-\]>>\[J\[2K\r--> ++++++++\[>++++\[>++>+++>+++>+<<<<-\]>+>+>->>+\[<\]<-\]>>.\[J\[2K\r--> ++++++++\[>++++\[>++>+++>+++>+<<<<-\]>+>+>->>+\[<\]<-\]>>.>\[J\[2K\r--> ++++++++\[>++++\[>++>+++>+++>+<<<<-\]>+>+>->>+\[<\]<-\]>>.>-\[J\[2K\r--> ++++++++\[>++++\[>++>+++>+++>+<<<<-\]>+>+>->>+\[<\]<-\]>>.>--\[J\[2K\r--> ++++++++\[>++++\[>++>+++>+++>+<<<<-\]>+>+>->>+\[<\]<-\]>>.>---\[J\[2K\r--> ++++++++\[>++++\[>++>+++>+++>+<<<<-\]>+>+>->>+\[<\]<-\]>>.>---.\[J\[2K\r--> ++++++++\[>++++\[>++>+++>+++>+<<<<-\]>+>+>->>+\[<\]<-\]>>.>---.+\[J\[2K\r--> ++++++++\[>++++\[>++>+++>+++>+<<<<-\]>+>+>->>+\[<\]<-\]>>.>---.++\[J\[2K\r--> ++++++++\[>++++\[>++>+++>+++>+<<<<-\]>+>+>->>+\[<\]<-\]>>.>---.+++\[J\[2K\r--> ++++++++\[>++++\[>++>+++>+++>+<<<<-\]>+>+>->>+\[<\]<-\]>>.>---.++++\[J\[2K\r--> ++++++++\[>++++\[>++>+++>+++>+<<<<-\]>+>+>->>+\[<\]<-\]>>.>---.+++++\[J\[2K\r--> ++++++++\[>++++\[>++>+++>+++>+<<<<-\]>+>+>->>+\[<\]<-\]>>.>---.++++++\[J\[2K\r--> ++++++++\[>++++\[>++>+++>+++>+<<<<-\]>+>+>->>+\[<\]<-\]>>.>---.+++++++\[J\[2K\r--> ++++++++\[>++++\[>++>+++>+++>+<<<<-\]>+>+>->>+\[<\]<-\]>>.>---.+++++++.\[J\[2K\r--> ++++++++\[>++++\[>++>+++>+++>+<<<<-\]>+>+>->>+\[<\]<-\]>>.>---.+++++++..\[J\[2K\r--> ++++++++\[>++++\[>++>+++>+++>+<<<<-\]>+>+>->>+\[<\]<-\]>>.>---.+++++++..+\[J\[2K\r--> ++++++++\[>++++\[>++>+++>+++>+<<<<-\]>+>+>->>+\[<\]<-\]>>.>---.+++++++..++\[J\[2K\r--> ++++++++\[>++++\[>++>+++>+++>+<<<<-\]>+>+>->>+\[<\]<-\]>>.>---.+++++++..+++\[J\[2K\r--> ++++++++\[>++++\[>++>+++>+++>+<<<<-\]>+>+>->>+\[<\]<-\]>>.>---.+++++++..+++.\[J\[2K\r--> ++++++++\[>++++\[>++>+++>+++>+<<<<-\]>+>+>->>+\[<\]<-\]>>.>---.+++++++..+++.>\[J\[2K\r--> ++++++++\[>++++\[>++>+++>+++>+<<<<-\]>+>+>->>+\[<\]<-\]>>.>---.+++++++..+++.>>\[J\[2K\r--> ++++++++\[>++++\[>++>+++>+++>+<<<<-\]>+>+>->>+\[<\]<-\]>>.>---.+++++++..+++.>>.\[J\[2K\r--> ++++++++\[>++++\[>++>+++>+++>+<<<<-\]>+>+>->>+\[<\]<-\]>>.>---.+++++++..+++.>>.<\[J\[2K\r--> ++++++++\[>++++\[>++>+++>+++>+<<<<-\]>+>+>->>+\[<\]<-\]>>.>---.+++++++..+++.>>.<-\[J\[2K\r--> ++++++++\[>++++\[>++>+++>+++>+<<<<-\]>+>+>->>+\[<\]<-\]>>.>---.+++++++..+++.>>.<-.\[J\[2K\r--> ++++++++\[>++++\[>++>+++>+++>+<<<<-\]>+>+>->>+\[<\]<-\]>>.>---.+++++++..+++.>>.<-.<\[J\[2K\r--> ++++++++\[>++++\[>++>+++>+++>+<<<<-\]>+>+>->>+\[<\]<-\]>>.>---.+++++++..+++.>>.<-.<.\[J\[2K\r--> ++++++++\[>++++\[>++>+++>+++>+<<<<-\]>+>+>->>+\[<\]<-\]>>.>---.+++++++..+++.>>.<-.<.+\[J\[2K\r--> ++++++++\[>++++\[>++>+++>+++>+<<<<-\]>+>+>->>+\[<\]<-\]>>.>---.+++++++..+++.>>.<-.<.++\[J\[2K\r--> ++++++++\[>++++\[>++>+++>+++>+<<<<-\]>+>+>->>+\[<\]<-\]>>.>---.+++++++..+++.>>.<-.<.+++\[J\[2K\r--> ++++++++\[>++++\[>++>+++>+++>+<<<<-\]>+>+>->>+\[<\]<-\]>>.>---.+++++++..+++.>>.<-.<.+++.\[J\[2K\r--> ++++++++\[>++++\[>++>+++>+++>+<<<<-\]>+>+>->>+\[<\]<-\]>>.>---.+++++++..+++.>>.<-.<.+++.-\[J\[2K\r--> ++++++++\[>++++\[>++>+++>+++>+<<<<-\]>+>+>->>+\[<\]<-\]>>.>---.+++++++..+++.>>.<-.<.+++.--\[J\[2K\r--> ++++++++\[>++++\[>++>+++>+++>+<<<<-\]>+>+>->>+\[<\]<-\]>>.>---.+++++++..+++.>>.<-.<.+++.---\[J\[2K\r--> ++++++++\[>++++\[>++>+++>+++>+<<<<-\]>+>+>->>+\[<\]<-\]>>.>---.+++++++..+++.>>.<-.<.+++.----\[J\[2K\r--> ++++++++\[>++++\[>++>+++>+++>+<<<<-\]>+>+>->>+\[<\]<-\]>>.>---.+++++++..+++.>>.<-.<.+++.-----\[J\[2K\r--> ++++++++\[>++++\[>++>+++>+++>+<<<<-\]>+>+>->>+\[<\]<-\]>>.>---.+++++++..+++.>>.<-.<.+++.------\[J\[2K\r--> ++++++++\[>++++\[>++>+++>+++>+<<<<-\]>+>+>->>+\[<\]<-\]>>.>---.+++++++..+++.>>.<-.<.+++.------.\[J\[2K\r--> ++++++++\[>++++\[>++>+++>+++>+<<<<-\]>+>+>->>+\[<\]<-\]>>.>---.+++++++..+++.>>.<-.<.+++.------.-\[J\[2K\r--> ++++++++\[>++++\[>++>+++>+++>+<<<<-\]>+>+>->>+\[<\]<-\]>>.>---.+++++++..+++.>>.<-.<.+++.------.--\[J\[2K\r--> ++++++++\[>++++\[>++>+++>+++>+<<<<-\]>+>+>->>+\[<\]<-\]>>.>---.+++++++..+++.>>.<-.<.+++.------.---\[J\[2K\r--> ++++++++\[>++++\[>++>+++>+++>+<<<<-\]>+>+>->>+\[<\]<-\]>>.>---.+++++++..+++.>>.<-.<.+++.------.----\[J\[2K\r--> ++++++++\[>++++\[>++>+++>+++>+<<<<-\]>+>+>->>+\[<\]<-\]>>.>---.+++++++..+++.>>.<-.<.+++.------.-----\[J\[2K\r--> ++++++++\[>++++\[>++>+++>+++>+<<<<-\]>+>+>->>+\[<\]<-\]>>.>---.+++++++..+++.>>.<-.<.+++.------.------\[J\[2K\r--> ++++++++\[>++++\[>++>+++>+++>+<<<<-\]>+>+>->>+\[<\]<-\]>>.>---.+++++++..+++.>>.<-.<.+++.------.-------\[J\[2K\r--> ++++++++\[>++++\[>++>+++>+++>+<<<<-\]>+>+>->>+\[<\]<-\]>>.>---.+++++++..+++.>>.<-.<.+++.------.--------\[J\[2K\r--> ++++++++\[>++++\[>++>+++>+++>+<<<<-\]>+>+>->>+\[<\]<-\]>>.>---.+++++++..+++.>>.<-.<.+++.------.--------.\[J\[2K\r--> ++++++++\[>++++\[>++>+++>+++>+<<<<-\]>+>+>->>+\[<\]<-\]>>.>---.+++++++..+++.>>.<-.<.+++.------.--------.>\[J\[2K\r--> ++++++++\[>++++\[>++>+++>+++>+<<<<-\]>+>+>->>+\[<\]<-\]>>.>---.+++++++..+++.>>.<-.<.+++.------.--------.>>\[J\[2K\r--> ++++++++\[>++++\[>++>+++>+++>+<<<<-\]>+>+>->>+\[<\]<-\]>>.>---.+++++++..+++.>>.<-.<.+++.------.--------.>>+\[J\[2K\r--> ++++++++\[>++++\[>++>+++>+++>+<<<<-\]>+>+>->>+\[<\]<-\]>>.>---.+++++++..+++.>>.<-.<.+++.------.--------.>>+.\[J\[2K\r--> ++++++++\[>++++\[>++>+++>+++>+<<<<-\]>+>+>->>+\[<\]<-\]>>.>---.+++++++..+++.>>.<-.<.+++.------.--------.>>+.>\[J\[2K\r--> ++++++++\[>++++\[>++>+++>+++>+<<<<-\]>+>+>->>+\[<\]<-\]>>.>---.+++++++..+++.>>.<-.<.+++.------.--------.>>+.>+\[J\[2K\r--> ++++++++\[>++++\[>++>+++>+++>+<<<<-\]>+>+>->>+\[<\]<-\]>>.>---.+++++++..+++.>>.<-.<.+++.------.--------.>>+.>++\[J\[2K\r--> ++++++++\[>++++\[>++>+++>+++>+<<<<-\]>+>+>->>+\[<\]<-\]>>.>---.+++++++..+++.>>.<-.<.+++.------.--------.>>+.>++.\[J\[2K\r--> ++++++++\[>++++\[>++>+++>+++>+<<<<-\]>+>+>->>+\[<\]<-\]>>.>---.+++++++..+++.>>.<-.<.+++.------.--------.>>+.>++.\[J\[2K\r--> ++++++++\[>++++\[>++>+++>+++>+<<<<-\]>+>+>->>+\[<\]<-\]>>.>---.+++++++..+++.>>.<-.<.+++.------.--------.>>+.>++.\r
+Hello World!\r
+\r
+\[J\[2K\r-->  "
+send -- ""
+expect eof

tests/brainfuck/hello_world_file.exp

@@ -0,0 +1,48 @@
+#!/usr/bin/expect -f
+#
+# This Expect script was generated by autoexpect on Thu Jul 15 16:21:38 2021
+# Expect and autoexpect were both written by Don Libes, NIST.
+#
+# Note that autoexpect does not guarantee a working script.  It
+# necessarily has to guess about certain things.  Two reasons a script
+# might fail are:
+#
+# 1) timing - A surprising number of programs (rn, ksh, zsh, telnet,
+# etc.) and devices discard or ignore keystrokes that arrive "too
+# quickly" after prompts.  If you find your new script hanging up at
+# one spot, try adding a short sleep just before the previous send.
+# Setting "force_conservative" to 1 (see below) makes Expect do this
+# automatically - pausing briefly before sending each character.  This
+# pacifies every program I know of.  The -c flag makes the script do
+# this in the first place.  The -C flag allows you to define a
+# character to toggle this mode off and on.
+
+set force_conservative 0  ;# set to 1 to force conservative mode even if
+			  ;# script wasn't run conservatively originally
+if {$force_conservative} {
+	set send_slow {1 .1}
+	proc send {ignore arg} {
+		sleep .1
+		exp_send -s -- $arg
+	}
+}
+
+#
+# 2) differing output - Some programs produce different output each time
+# they run.  The "date" command is an obvious example.  Another is
+# ftp, if it produces throughput statistics at the end of a file
+# transfer.  If this causes a problem, delete these patterns or replace
+# them with wildcards.  An alternative is to use the -p flag (for
+# "prompt") which makes Expect only look for the last line of output
+# (i.e., the prompt).  The -P flag allows you to define a character to
+# toggle this mode off and on.
+#
+# Read the man page for more info.
+#
+# -Don
+
+
+set timeout -1
+spawn ./prybar-brainfuck ./test_files/hello_world.bf
+match_max 100000
+expect eof

tests/brainfuck/no_matching_close.exp

@@ -0,0 +1,71 @@
+#!/usr/bin/expect -f
+#
+# This Expect script was generated by autoexpect on Thu Jul 15 16:06:52 2021
+# Expect and autoexpect were both written by Don Libes, NIST.
+#
+# Note that autoexpect does not guarantee a working script.  It
+# necessarily has to guess about certain things.  Two reasons a script
+# might fail are:
+#
+# 1) timing - A surprising number of programs (rn, ksh, zsh, telnet,
+# etc.) and devices discard or ignore keystrokes that arrive "too
+# quickly" after prompts.  If you find your new script hanging up at
+# one spot, try adding a short sleep just before the previous send.
+# Setting "force_conservative" to 1 (see below) makes Expect do this
+# automatically - pausing briefly before sending each character.  This
+# pacifies every program I know of.  The -c flag makes the script do
+# this in the first place.  The -C flag allows you to define a
+# character to toggle this mode off and on.
+
+set force_conservative 0  ;# set to 1 to force conservative mode even if
+			  ;# script wasn't run conservatively originally
+if {$force_conservative} {
+	set send_slow {1 .1}
+	proc send {ignore arg} {
+		sleep .1
+		exp_send -s -- $arg
+	}
+}
+
+#
+# 2) differing output - Some programs produce different output each time
+# they run.  The "date" command is an obvious example.  Another is
+# ftp, if it produces throughput statistics at the end of a file
+# transfer.  If this causes a problem, delete these patterns or replace
+# them with wildcards.  An alternative is to use the -p flag (for
+# "prompt") which makes Expect only look for the last line of output
+# (i.e., the prompt).  The -P flag allows you to define a character to
+# toggle this mode off and on.
+#
+# Read the man page for more info.
+#
+# -Don
+
+
+set timeout -1
+spawn ./prybar-brainfuck -I
+match_max 100000
+expect -exact "Brainfuck\r
+\[J\[2K\r-->  "
+send -- "\["
+expect -exact "\[J\[2K\r--> \["
+send -- "+"
+expect -exact "\[J\[2K\r--> \[+"
+send -- "+"
+expect -exact "\[J\[2K\r--> \[++"
+send -- "+"
+expect -exact "\[J\[2K\r--> \[+++"
+send -- "+"
+expect -exact "\[J\[2K\r--> \[++++"
+send -- "+"
+expect -exact "\[J\[2K\r--> \[+++++"
+send -- "+"
+expect -exact "\[J\[2K\r--> \[++++++"
+send -- "+"
+expect -exact "\[J\[2K\r--> \[+++++++"
+send -- "\r"
+expect -exact "\[J\[2K\r--> \[+++++++\[J\[2K\r--> \[+++++++\r
+Couldn't find a matching '\]'\r
+\[J\[2K\r-->  "
+send -- ""
+expect eof