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|
package main
import (
"fmt"
"strconv"
"regexp"
"os"
)
func readfile(path string) []string {
var raw []string;
reg := regexp.MustCompile(" |\n")
dat, err := os.ReadFile(path);
if (err != nil) {
panic("failed to read file");
}
/* FIXME: Find a better solution */
tmp := reg.Split(string(dat), -1);
for i := range tmp{
if tmp[i] != "" {
raw = append(raw, tmp[i]);
}
};
return raw;
}
func interpret(raw[]string) {
var err error;
var number int;
var stack[]int;
var skip_to_end bool;
for i := 0; i < len(raw); i++ {
length := len(stack);
/* Conditional looping */
if (skip_to_end && raw[i] != "end") {
continue;
}
number, err = strconv.Atoi(raw[i]);
if err == nil {
stack = append(stack, number);
continue;
}
switch raw[i] {
case "+":
if length < 2 {
panic("failed to plus: stack underflow");
}
stack[length - 2] = stack[length - 1] + stack[length - 2]
stack = stack[:length - 1];
case "-":
if length < 2 {
panic("failed to minus: stack underflow");
}
stack[length - 2] = stack[length - 1] - stack[length - 2]
stack = stack[:length - 1];
case "=":
if length < 2 {
panic("failed to check equality: stack underflow");
}
if (stack[length - 1] == stack[length - 2]) {
stack = append(stack, -1);
} else {
stack = append(stack, 0);
}
case ".":
if length < 1 {
panic("failed to dump: stack underflow");
}
fmt.Println(stack[length - 1]);
stack = stack[:length - 1];
case "if":
if length < 1 {
panic("failed to if: stack underflow");
}
if (stack[length - 1] == 0) {
skip_to_end = true;
}
stack = stack[:length - 1];
case "end":
skip_to_end = false;
default:
panic("invalid word");
}
}
}
func main() {
var file string;
argv := os.Args;
argc := len(argv);
compile_flg := false;
switch argc {
case 3:
if argv[1] != "-S" {
panic("Invalid usage");
}
compile_flg = true;
fallthrough;
case 2:
file = argv[argc - 1];
default:
panic("Invaid usage");
}
output := readfile(file);
if (compile_flg) {
panic("Not Implemented");
} else {
interpret(output);
}
}
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