fleshed out GetVar, added Token stack collection, started printing module

pkg/shsh/debug.go

@@ -0,0 +1,57 @@
+package shsh
+
+import (
+    "collections"
+)
+
+func FmtToken(arg *Token) string {
+    suffix := ""
+    if arg.next != nil {
+        suffix = "->"
+    }
+
+    switch arg.tag {
+    case LIST:
+        return sprintf("(%s, List @ %p, %d)%s", "LIST", arg._inner,
+            arg.position, suffix)
+
+    default:
+        return sprintf("(%s, %s, %d)%s", GetTagAsStr(arg.tag), arg._inner,
+            arg.position, suffix)
+    }
+}
+
+func GetTagAsStr(tag token_t) string {
+    switch tag {
+    case LIST:
+        return "LIST"
+    case STRING:
+        return "STRING"
+    case NUMBER:
+        return "NUMBER"
+    case SYMBOL:
+        return "SYMBOL"
+    }
+}
+
+func PrintSExpression(arg *Token) {
+    var lists Stack;
+    lists.push(arg)
+
+loop:
+    // string builder?
+    i := lists.pop()
+    if i == nil {
+        goto done
+    }
+
+    for (iter := i; iter != nil; iter = i.next {
+        // add each string to string builder?
+    }
+
+    // print stringbuilder?
+    goto loop
+
+done:
+    // TODO: Perhaps print some debug analytics here
+}

pkg/shsh/stack.go

@@ -0,0 +1,22 @@
+package shsh
+
+type TokenStack struct {
+    buffer []*Token
+    int capacity
+}
+
+func (s *Stack) Push(v *Token) {
+    s.capacity++
+    *s.buffer = append(*s.buffer, v)
+}
+
+func (s *Stack) Pop() *Token {
+    if s.capacity <= 0 {
+        return nil
+    }
+
+    s.capacity--
+    res := *s.buffer[len(*s.buffer) - 1]
+    *s = *s.buffer[ :len(*s) - 1]
+    return ret
+}

pkg/shsh/token.go

@@ -14,7 +14,7 @@ const (
 
 type Token struct {
     next *Token
-    tag parse_tag
+    tag token_t
     int position
     _inner interface{}
 }

pkg/shsh/var_table.go

@@ -13,5 +13,13 @@ var (
 // Library represents variables defined in inner scope
 // It is assumed library is ordered from innermost scope to outermost scope
 func GetVar(arg string, library []VarTable) *Token {
+    for dict, scope := library {
+        val, ok := dict[arg]
+        if ok {
+            // TODO: maybe log which scope it was found in?
+            return val
+        }
+    }
 
+    return nil
 }