mirror of https://github.com/01-edu/public.git
You can not select more than 25 topics
Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
68 lines
1.4 KiB
68 lines
1.4 KiB
package main |
|
|
|
import ( |
|
"os" |
|
|
|
"github.com/01-edu/z01" |
|
) |
|
|
|
const SIZE = 2048 |
|
|
|
func main() { |
|
if len(os.Args) == 2 { |
|
progpoint := []byte(os.Args[1]) |
|
var arby [SIZE]byte |
|
pos := 0 |
|
openBr := 0 //opened brackets |
|
i := 0 //iterates through the source code passed in the argument |
|
N := len(progpoint) //length of the source code |
|
for i >= 0 && i < N { |
|
switch progpoint[i] { |
|
case '>': |
|
//Increment the pointer |
|
pos++ |
|
case '<': |
|
//decrement the pointes |
|
pos-- |
|
case '+': |
|
//increment the pointed byte |
|
arby[pos]++ |
|
case '-': |
|
//decrement the pointed byte |
|
arby[pos]-- |
|
case '.': |
|
//print the pointed byte on std output |
|
z01.PrintRune(rune(arby[pos])) |
|
case '[': |
|
//go to the matching ']' if the pointed byte is 0 (while start) |
|
openBr = 0 |
|
if arby[pos] == 0 { |
|
for i < N && (progpoint[i] != byte(']') || openBr > 1) { |
|
if progpoint[i] == byte('[') { |
|
openBr++ |
|
} else if progpoint[i] == byte(']') { |
|
openBr-- |
|
} |
|
i++ |
|
} |
|
} |
|
case ']': |
|
//go to the matching '[' if the pointed byte is not 0 (while end) |
|
openBr = 0 |
|
if arby[pos] != 0 { |
|
for i >= 0 && (progpoint[i] != byte('[') || openBr > 1) { |
|
if progpoint[i] == byte(']') { |
|
openBr++ |
|
} else if progpoint[i] == byte('[') { |
|
openBr-- |
|
} |
|
i-- |
|
} |
|
} |
|
} |
|
i++ |
|
} |
|
} else { |
|
z01.PrintRune('\n') |
|
} |
|
}
|
|
|