Wire up repl & file interpreters.

foo.ld

@@ -0,0 +1 @@
+:foo

sandbox.ld

@@ -0,0 +1,3 @@
+import "foo.ld" as foo
+
+print ("Hello, world!", foo)

src/ludus/core.clj

@@ -2,7 +2,9 @@
   "A tree-walk interpreter for the Ludus language."
   (:require
     [ludus.scanner :as scanner]
-   [ludus.parser :as parser]
+    ;[ludus.parser :as parser]
+    [ludus.parser-new :as p]
+    [ludus.grammar :as g]
     [ludus.interpreter :as interpreter]
     [ludus.show :as show]
     [clojure.pprint :as pp]
@@ -11,27 +13,27 @@
   (:gen-class))
 
 (defn- run [file source]
-(comment  (let [scanned (scanner/scan source)]
+  (let [scanned (scanner/scan source)]
     (if (not-empty (:errors scanned))
       (do
         (println "I found some scanning errors!")
         (pp/pprint (:errors scanned))
         (System/exit 65))
-      (let [parsed (parser/parse scanned)]
+      (let [parsed (p/apply-parser g/script (:tokens scanned))]
-        (if (not-empty (:errors parsed))
+        (if (p/fail? parsed)
           (do
             (println "I found some parsing errors!")
-            (pp/pprint (:errors parsed))
+            (println p/err-msg parsed)
             (System/exit 66))
-          (let [interpreted (interpreter/interpret parsed file)]
+          (let [interpreted (interpreter/interpret source file parsed)]
             (println (show/show interpreted))
-            (System/exit 0))))))))
+            (System/exit 0)))))))
 
 (defn -main [& args]
-(comment  (cond
+  (cond
     (= (count args) 1)
     (let [file (first args)
           source (loader/load-import file)]
       (run file source))
 
-    :else (repl/launch))))
+    :else (repl/launch)))

src/ludus/interpreter.clj

@@ -11,8 +11,8 @@
     [ludus.loader :as loader]
     [ludus.token :as token]
     [ludus.process :as process]
-    [clojure.pprint :as pp]
+    [clojure.set]
-    [clojure.set]))
+    [clojure.string]))
 
 (def ^:dynamic self @process/current-pid)
 
@@ -301,7 +301,7 @@
 
       :struct-pattern (match-struct pattern value ctx-vol)
 
-      (throw (ex-info "Unknown pattern on line " {:pattern pattern :value value})))))
+      (throw (ex-info "Unknown pattern on line " {:ast pattern :value value})))))
 
 (defn- update-ctx [ctx new-ctx]
   (merge ctx new-ctx))
@@ -607,9 +607,15 @@
                        (if (::loader/error (ex-data e))
                          (throw (ex-info (ex-message e) {:ast ast}))
                          (throw e))))
-            result (-> source (scanner/scan) (parser/parse) (interpret-file path))]
+            parsed (->> source (scanner/scan) :tokens (p/apply-parser g/script))] 
-        (vswap! ctx update-ctx {name result})
+        (if (p/fail? parsed)
-        result
+          (throw (ex-info 
+                   (str "Parse error in file " path "\n"
+                     (p/err-msg parsed))
+                   {:ast ast}))        
+          (let [interpret-result (interpret-file source path parsed)]
+            (vswap! ctx update-ctx {name interpret-result})
+            interpret-result))
         ))))
 
 (defn- interpret-ref [ast ctx]
@@ -883,35 +889,42 @@
     :dict (interpret-dict ast ctx)
 
     :struct-literal
-    (let [members (:members ast)] (interpret-struct ast ctx))
+    (interpret-struct ast ctx)
 
-    (throw (ex-info "Unknown AST node type" {:ast ast}))))
+    (throw (ex-info (str "Unknown AST node type: " (:type ast)) {:ast ast}))))
+
+(defn get-line [source line]
+  (if line
+    (let [lines (clojure.string/split source #"\n")]
+      (clojure.string/trim (nth lines (dec line))))))
 
 ;; TODO: update this to use new parser pipeline & new AST representation
-(defn interpret-file [parsed file]
+(defn interpret-file [source path parsed]
   (try 
-    (let [base-ctx (volatile! (merge {:file file} prelude/prelude process/process))]
+    (let [base-ctx (volatile! {::parent (volatile! prelude/prelude) :file path})]
-      (interpret-ast (::parser/ast parsed) base-ctx))
+      (interpret-ast parsed base-ctx))
     (catch clojure.lang.ExceptionInfo e
-      (println "Ludus panicked in" file)
+      (println "Ludus panicked in" path)
-      (println "On line" (get-in (ex-data e) [:ast :token ::token/line]))
+      (println "On line" (get-in (ex-data e) [:ast :token :line]))
+      (println ">>> " (get-line source (get-in (ex-data e) [:ast :token :line])))
       (println (ex-message e))
       (System/exit 67))))
 
 ;; TODO: update this to use new parser pipeline & new AST representation
-(defn interpret [parsed file]
+(defn interpret [source path parsed]
   (try
-    (let [base-ctx (volatile! (merge {:file file} prelude/prelude process/process))
+    (let [base-ctx (volatile! {::parent (volatile! prelude/prelude) :file path})
           process (process/new-process)]
       (process/start-vm)
       (with-bindings {#'self (:pid @process)}
-        (let [result (interpret-ast (::parser/ast parsed) {::parent base-ctx})]
+        (let [result (interpret-ast parsed base-ctx)]
           (swap! process #(assoc % :status :dead))
           (process/stop-vm)
           result)))
     (catch clojure.lang.ExceptionInfo e
-      (println "Ludus panicked in" file)
+      (println "Ludus panicked in" path)
-      (println "On line" (get-in (ex-data e) [:ast :token ::token/line]))
+      (println "On line" (get-in (ex-data e) [:ast :token :line]))
+      (println ">>> " (get-line source (get-in (ex-data e) [:ast :token :line])))
       (println (ex-message e))
       (System/exit 67))))
 
@@ -927,10 +940,11 @@
           result)))
     (catch clojure.lang.ExceptionInfo e
       (process/stop-vm)
-      (println "Ludus panicked!")
+      (println "Ludus panicked on line " (get-in (ex-data e) [:ast :token :line]))
-      (println "On line" (get-in (ex-data e) [:ast :token :line]))
+      (println "> " (get-in (ex-data e) [:ast :token]))
       (println (ex-message e))
-      (pp/pprint (ex-data e)))))
+      ;(pp/pprint (ex-data e))
+      )))
 
 ;; TODO: update this to use new parser pipeline & new AST representation
 (defn interpret-repl
@@ -941,7 +955,7 @@
      (try
        (process/start-vm)
        (with-bindings {#'self pid}
-         (let [result (interpret-ast (::parser/ast parsed) ctx)]
+         (let [result (interpret-ast parsed ctx)]
            {:result result :ctx ctx :pid pid}))
        (catch clojure.lang.ExceptionInfo e
          (println "Ludus panicked!")
@@ -952,7 +966,7 @@
      (try
        (process/start-vm)
        (with-bindings {#'self pid}
-         (let [result (interpret-ast (::parser/ast parsed) ctx)]
+         (let [result (interpret-ast parsed ctx)]
            {:result result :ctx ctx :pid pid}))
        (catch clojure.lang.ExceptionInfo e
          (println "Ludus panicked!")
@@ -961,11 +975,9 @@
          )))))
 
 
-(do
+(comment
   (def source "
-    let xs = [1, 2, 3]
+    let 2 = 1
-    let ys = #{:a 1, :b 2}
-    get (:c, ys)
       ")
 
   (println "")

src/ludus/prelude.clj

@@ -2,7 +2,8 @@
   (:require
     [ludus.data :as data]
     [ludus.show :as show]
-    [ludus.draw :as d]))
+    ;[ludus.draw :as d]
+    ))
 
 ;; TODO: make eq, and, or special forms that short-circuit
 ;; Right now, they evaluate all their args
@@ -102,10 +103,6 @@
                       (get map key default)
                       default)))})
 
-(def draw {:name "draw"
-           ::data/type ::data/clj
-           :body d/ludus-draw})
-
 (def first- {:name "first"
              ::data/type ::data/clj
              :body (fn [v] (second v))})
@@ -191,7 +188,6 @@
               "assoc" assoc-
               "conj" conj-
               "get" get-
-              "draw" draw
               "type" type-
               "clj" clj
               "first" first-

src/ludus/repl.clj

@@ -1,12 +1,15 @@
 (ns ludus.repl
   (:require
     [ludus.scanner :as scanner]
-    [ludus.parser :as parser]
+    ;[ludus.parser :as parser]
+    [ludus.parser-new :as p]
+    [ludus.grammar :as g]
     [ludus.interpreter :as interpreter]
     [ludus.prelude :as prelude]
     [ludus.show :as show]
     [ludus.data :as data]
-    [ludus.process :as process]))
+    ;[ludus.process :as process]
+    ))
 
 (declare repl-prelude new-session)
 
@@ -20,7 +23,7 @@
   (println "\nGoodbye!")
   (System/exit 0))
 
-(def base-ctx (merge prelude/prelude process/process
+(def base-ctx (merge prelude/prelude ;process/process
                 {::repl true
                  "repl"
                  {::data/struct true
@@ -91,12 +94,19 @@
         (= "" input) (recur)
 
         :else
-        (let [parsed (-> input (scanner/scan) (parser/parse))
+        (let [parsed (->> input 
-              {result :result ctx :ctx pid- :pid}
+                       (scanner/scan) 
+                       :tokens 
+                       (p/apply-parser g/script))]
+          (if (= :err (:status parsed))
+            (do
+              (println (p/err-msg parsed))
+              (recur))
+            (let [{result :result ctx :ctx pid- :pid}
                   (if pid
                     (interpreter/interpret-repl parsed orig-ctx pid)
                     (interpreter/interpret-repl parsed orig-ctx))]
-          (if (= result ::interpreter/error)
+              (if (= result :error)
                 (recur)
                 (do
                   (println (show/show result))
@@ -104,7 +114,7 @@
                     (swap! session-atom #(assoc % :ctx ctx)))
                   (when (not (= pid pid-))
                     (swap! session-atom #(assoc % :pid pid-)))
-              (recur))))))))
+                  (recur))))))))))
 
 (defn launch []
   (println "Welcome to Ludus (v. 0.1.0-alpha)")