use crate::bf_interpreter::interpreter::Interpreter;
use console::Term;
pub struct Repl {
pub interpreter: Interpreter,
pub term: Term,
pub history: Vec<String>,
pub loop_body: String,
pub loop_depth: usize,
}
pub const PROMPT: &str = "bf-interpreter> ";
pub const HISTORY_FILE: &str = "bf-interpreter-history.bfr";
pub const COMMAND_PREFIX: &str = "!";
#[cfg(test)]
mod tests {
use super::*;
use crate::bf_interpreter::cell::Cell;
use pretty_assertions::assert_eq;
#[test]
fn nested_loop_level_1() {
let term = Term::stdout();
let interpreter = Interpreter::new(4, vec![], term);
let mut repl = Repl::new(interpreter);
repl.process("++".to_string());
repl.process("[>++".to_string());
repl.process("[>+<-]".to_string());
repl.process("<-]".to_string());
let cells = &repl.interpreter.cells;
assert_eq!(cells[0], Cell::default_cell(&vec![]));
assert_eq!(cells[1], Cell::default_cell(&vec![]));
assert_eq!(cells[2], Cell::new(4, &vec![]));
}
#[test]
fn nested_loop_level_2() {
let term = Term::stdout();
let interpreter = Interpreter::new(4, vec![], term);
let mut repl = Repl::new(interpreter);
repl.process("++".to_string());
repl.process("[>++".to_string());
repl.process("[>+<-]".to_string());
repl.process("[>++".to_string());
repl.process("[>+<-]".to_string());
repl.process("<-]".to_string());
repl.process("<-]".to_string());
let cells = &repl.interpreter.cells;
assert_eq!(cells[0], Cell::default_cell(&vec![]));
assert_eq!(cells[1], Cell::default_cell(&vec![]));
assert_eq!(cells[2], Cell::new(4, &vec![]));
}
#[test]
fn print_my_first_name() {
let term = Term::stdout();
let interpreter = Interpreter::new(10, vec![], term);
let mut repl = Repl::new(interpreter);
let code = "++++ ++++ 8
[
>++++
[
>++ A
>+++ a
>++++
>+ space
<<<<-
]
>>>>>>++
[
<<<-
>>>-
]
<<<<<<<-
]
>>+. Print cell 2: A
<<++++
[
>+++
[
>+++
<-
]
>++
<<-
]
>>+. Print n
<<+++
[
>+++
[
>-
<-
]
>-
<<-
]
>>-. Print n
<<++++++
[
>>+++
<<-
]
>>. Print s"
.to_string()
.split("\n")
.map(|s| s.to_string())
.collect::<Vec<String>>();
for line in code {
repl.process(line);
}
assert_eq!(repl.interpreter.cells[0], Cell::default_cell(&vec![]));
assert_eq!(repl.interpreter.cells[1], Cell::default_cell(&vec![]));
assert_eq!(repl.interpreter.cells[2], Cell::new(115, &vec![]));
assert_eq!(repl.interpreter.cells[3], Cell::new(96, &vec![]));
assert_eq!(repl.interpreter.cells[4], Cell::new(112, &vec![]));
assert_eq!(repl.interpreter.cells[5], Cell::new(32, &vec![]));
}
#[test]
fn print_my_first_name_in_one_command() {
let term = Term::stdout();
let interpreter = Interpreter::new(10, vec![], term);
let mut repl = Repl::new(interpreter);
let code = "++++++++[>++++[>++>+++>++++>+<<<<-]>>>>>>++[<<<->>>-]<<<<<<<-]>>+.\
<<++++[>+++[>+++<-]>++<<-]>>+.<<+++[>+++[>-<-]>-<<-]>>-.<<++++++[>>+++<<-]>>."
.to_string();
repl.process(code);
assert_eq!(repl.interpreter.cells[0], Cell::default_cell(&vec![]));
assert_eq!(repl.interpreter.cells[1], Cell::default_cell(&vec![]));
assert_eq!(repl.interpreter.cells[2], Cell::new(115, &vec![]));
assert_eq!(repl.interpreter.cells[3], Cell::new(96, &vec![]));
assert_eq!(repl.interpreter.cells[4], Cell::new(112, &vec![]));
assert_eq!(repl.interpreter.cells[5], Cell::new(32, &vec![]));
}
#[test]
fn print_hello_world() {
let term = Term::stdout();
let interpreter = Interpreter::new(10, vec![], term);
let mut repl = Repl::new(interpreter);
let _ = "[ This program prints \"Hello World!\" and a newline to the screen, its
length is 106 active command characters. [It is not the shortest.]
]
++++++++ Set Cell #0 to 8
[
>++++ Add 4 to Cell #1; this will always set Cell #1 to 4
[ as the cell will be cleared by the loop
>++ Add 2 to Cell #2
>+++ Add 3 to Cell #3
>+++ Add 3 to Cell #4
>+ Add 1 to Cell #5
<<<<- Decrement the loop counter in Cell #1
] Loop until Cell #1 is zero; number of iterations is 4
>+ Add 1 to Cell #2
>+ Add 1 to Cell #3
>- Subtract 1 from Cell #4
>>+ Add 1 to Cell #6
[<] Move back to the first zero cell you find; this will
be Cell #1 which was cleared by the previous loop
<- Decrement the loop Counter in Cell #0
] Loop until Cell #0 is zero; number of iterations is 8
The result of this is:
Cell no : 0 1 2 3 4 5 6
Contents: 0 0 72 104 88 32 8
Pointer : ^
>>. Cell #2 has value 72 which is 'H'
>---. Subtract 3 from Cell #3 to get 101 which is 'e'
+++++++..+++. Likewise for 'llo' from Cell #3
>>. Cell #5 is 32 for the space
<-. Subtract 1 from Cell #4 for 87 to give a 'W'
<. Cell #3 was set to 'o' from the end of 'Hello'
+++.------.--------. Cell #3 for 'rl' and 'd'
>>+. Add 1 to Cell #5 gives us an exclamation point
>++. And finally a newline from Cell #6
"
.to_string()
.split("\n")
.for_each(|s| repl.process(s.to_string()));
}
}