first commit

1 files changed, 95 insertions, 0 deletions

diff --git a/src/main.go b/src/main.go
new file mode 100644
index 0000000..f831ec8
--- /dev/null
+++ b/src/main.go
@@ -0,0 +1,95 @@
+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;
+
+	for i := 0; i < len(raw); i++ {
+		length := len(stack);
+		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 < 1 {
+				panic("failed to dump: stack underflow");
+			}
+			fmt.Println(stack[length - 1]);
+			stack = stack[:length - 1];
+		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);
+	}
+}