Parse do expressions/pipelines

src/ludus/parser.clj

@@ -538,6 +538,24 @@
 
       (panic parser "Expected name or clause after fn"))))
 
+(defn- parse-do [parser]
+  (let [first (advance parser)]
+    (loop [parser first
+           exprs []]
+      (println "parsing do")
+      (pp/pprint parser)
+      (pp/pprint exprs)
+      (let [expr (parse-expr parser)
+            expr+newline (accept ::token/newline expr)
+            next (token-type expr+newline)]
+        (println "current ast " (::ast expr))
+        (println "next token " next)     
+        (if (= ::token/pipeline next)
+          (recur (advance expr+newline) (conj exprs (::ast expr)))
+          (assoc expr ::ast {::ast/type ::ast/pipeline
+            :exprs (conj exprs (::ast expr))})
+          )))))
+
 (defn- parse-expr
   ([parser] (parse-expr parser sync-on))
   ([parser sync-on]
@@ -584,6 +602,8 @@
 
        ::token/fn (parse-fn parser)
 
+       ::token/do (parse-do parser)
+
        ;; TODO: improve handling of comments?
        ;; Scanner now just skips comments
        ;; ::token/comment (advance parser)
@@ -606,13 +626,10 @@
 
 (comment
   (def pp pp/pprint)
-  (def source "
-
-fn maybe_foo (mf) -> if eq (mf, :foo)
-      then (:ok, :foo)
-      else (:error, mf)
-
-
+  (def source "do foo 
+                > bar 
+                > baz
+                foo 
     ")
   (def lexed (scanner/scan source))
   (def tokens (:tokens lexed))