update samples

Author: chai2010

samples/Wa/brainfuck.wa

@@ -1,24 +1,32 @@
-// 版权 @2019 凹语言 作者。保留所有权利。
+// BrainFuck VM
+// https://github.com/chai2010/brainfuck-wa
 
 func main {
 	// print hi
 	const code = "++++++++++[>++++++++++<-]>++++.+."
 	vm := NewBrainFuck(code)
-	vm.Run()
+	println(string(vm.Run()))
 }
 
-type BrainFuck struct {
-	mem  :[30000]byte
-	code :string
-	pos  :int
-	pc   :int
+func Run(code: string) => string {
+	vm := NewBrainFuck(code)
+	return string(vm.Run())
+}
+
+// BF VM
+type BrainFuck :struct {
+	mem:  [30000]byte
+	code: string
+	pos:  int
+	pc:   int
 }
 
 func NewBrainFuck(code: string) => *BrainFuck {
 	return &BrainFuck{code: code}
 }
 
-func BrainFuck.Run {
+func BrainFuck.Run => []byte {
+	output := make([]byte, 0, 64)
 	for ; this.pc != len(this.code); this.pc++ {
 		switch x := this.code[this.pc]; x {
 		case '>':
@@ -38,12 +46,12 @@ func BrainFuck.Run {
 				this.loop(-1)
 			}
 		case '.':
-			print(rune(this.mem[this.pos]))
+			output = append(output, this.mem[this.pos])
 		case ',':
 			// TODO: support read byte
 		}
 	}
-	return
+	return output
 }
 
 func BrainFuck.loop(inc: int) {