1 files changed, 33 insertions, 0 deletions
diff --git a/src/interpreter.nim b/src/interpreter.nim
new file mode 100644
index 0000000..56313b5
--- /dev/null
+++ b/src/interpreter.nim
@@ -0,0 +1,33 @@
+import field
+import pointer
+
+type
+  Interpreter = object
+    f: ref Field
+    p: ref Pointer
+    argv: seq[string]
+
+func NewInterpreter*(f: ref Field, p: ref Pointer): ref Interpreter =
+  new(result)
+  result.f = f
+  result.p = p
+
+proc Step*(i: var Interpreter): ref int =
+  var prev: ref Pointer
+  var p = i.p
+  while p != nil:
+    let (d, v) = p[].Exec(i.f[])
+    if v != nil:
+      return v
+    if d:
+      if prev == nil:
+        i.p = p.next
+      else:
+        prev.next = p.next
+    p = p.next
+
+proc Run*(i: var Interpreter): int =
+  while i.p != nil:
+    let v = i.Step()
+    if v != nil:
+      return v[]