Data commit

Task/Execute-Brain-/Kotlin/execute-brain-.kotlin

@@ -0,0 +1,51 @@
+// version 1.1.2
+
+class Brainf__k(val prog: String, memSize: Int) {
+    private val mem = IntArray(memSize)
+    private var ip = 0
+    private var dp = 0
+    private val memVal get() = mem.getOrElse(dp) { 0 }
+
+    fun execute() {
+        while (ip < prog.length) {
+            when (prog[ip++]) {
+                '>' -> dp++
+                '<' -> dp--
+                '+' -> mem[dp] = memVal + 1
+                '-' -> mem[dp] = memVal - 1
+                ',' -> mem[dp] = System.`in`.read()
+                '.' -> print(memVal.toChar())
+                '[' -> handleLoopStart()
+                ']' -> handleLoopEnd()
+            }
+        }
+    }
+
+    private fun handleLoopStart() {
+        if (memVal != 0) return
+        var depth = 1
+        while (ip < prog.length) {
+            when (prog[ip++]) {
+                '[' -> depth++
+                ']' -> if (--depth == 0) return
+            }
+        }
+        throw IllegalStateException("Could not find matching end bracket")
+    }
+
+    private fun handleLoopEnd() {
+        var depth = 0
+        while (ip >= 0) {
+            when (prog[--ip]) {
+                ']' -> depth++
+                '[' -> if (--depth == 0) return
+            }
+        }
+        throw IllegalStateException("Could not find matching start bracket")
+    }
+}
+
+fun main(args: Array<String>) {
+    val prog = "++++++++++[>+++++++>++++++++++>+++>+<<<<-]>++.>+.+++++++..+++.>++.<<+++++++++++++++.>.+++.------.--------.>+.>."
+    Brainf__k(prog, 10).execute()
+}