Very first draft of import expression

src/ludus/interpreter.clj

@@ -19,7 +19,7 @@
         (recur word (::parent ctx))
         (throw (ex-info (str "Unbound name: " word) {}))))))
 
-(declare interpret-ast match)
+(declare interpret-ast match interpret)
 
 (defn- match-tuple [pattern value ctx-atom]
   (cond
@@ -245,6 +245,21 @@
         (swap! ctx update-ctx {name ns})
         ns)))))
 
+(defn- interpret-import [ast ctx]
+  (let [path (:path ast)
+    name (:name ast)]
+    (if (contains? @ctx name)
+      (throw (ex-info (str "Name " name " is alrady bound") {}))
+  (let [result  ;; TODO: add any error handling at all   
+    (-> path
+          (slurp)
+          (scanner/scan)
+          (parser/parse)
+          (interpret))]
+    (swap! ctx update-ctx {name result})
+    result
+    ))))
+
 (defn interpret-ast [ast ctx]
   (case (::ast/type ast)
 
@@ -270,6 +285,8 @@
 
     ::ast/ns (interpret-ns ast ctx)
 
+    ::ast/import (interpret-import ast ctx)
+
     ::ast/block
     (let [exprs (:exprs ast)
       inner (pop exprs)