Apply better names for function and files. Add images for doc

interp/run.go

@@ -0,0 +1,86 @@
+package interp
+
+import "fmt"
+
+func (i *Interpreter) Run(entry *Node) {
+	for n := entry; n != nil; {
+		n.run(n, i)
+		if n.snext != nil {
+			n = n.snext
+		} else if n.next[1] == nil && n.next[0] == nil {
+			break
+		} else if (*n.val).(bool) {
+			n = n.next[1]
+		} else {
+			n = n.next[0]
+		}
+	}
+}
+
+// Functions set to run during execution of CFG
+
+//var sym map[string]*interface{} // FIXME: should be part of interpreter
+
+func assign(n *Node, i *Interpreter) {
+	name := n.Child[0].ident     // symbol name is in the expr LHS
+	i.sym[name] = n.Child[1].val // Set symbol value
+	n.Child[0].val = i.sym[name]
+	n.val = i.sym[name]
+}
+
+func and(n *Node, i *Interpreter) {
+	for _, child := range n.Child {
+		if child.ident != "" {
+			child.val = i.sym[child.ident]
+		}
+	}
+	*n.val = (*n.Child[0].val).(int64) & (*n.Child[1].val).(int64)
+}
+
+func printa(n []*Node) {
+	for _, m := range n {
+		fmt.Printf("%v", *m.val)
+	}
+	fmt.Println("")
+}
+
+func call(n *Node, i *Interpreter) {
+	for _, child := range n.Child {
+		if child.ident != "" {
+			child.val = i.sym[child.ident]
+		}
+	}
+	// Only builtin println is supported
+	switch n.Child[0].ident {
+	case "println":
+		printa(n.Child[1:])
+	default:
+		panic("function not implemented")
+	}
+}
+
+func equal(n *Node, i *Interpreter) {
+	for _, child := range n.Child {
+		if child.ident != "" {
+			child.val = i.sym[child.ident]
+		}
+	}
+	*n.val = (*n.Child[0].val).(int64) == (*n.Child[1].val).(int64)
+}
+
+func inc(n *Node, i *Interpreter) {
+	n.Child[0].val = i.sym[n.Child[0].ident]
+	*n.Child[0].val = (*n.Child[0].val).(int64) + 1
+	*n.val = *n.Child[0].val
+}
+
+func lower(n *Node, i *Interpreter) {
+	for _, child := range n.Child {
+		if child.ident != "" {
+			child.val = i.sym[child.ident]
+		}
+	}
+	*n.val = (*n.Child[0].val).(int64) < (*n.Child[1].val).(int64)
+}
+
+func nop(n *Node, i *Interpreter) {}