Parse ns

src/ludus/parser.clj

@@ -318,6 +318,49 @@
 
       (panic parser "Struct entries must be single words or keyword+expression pairs" #{::token/rbrace})))))
 
+(defn- parse-ns [parser]
+  (let [name (expect* #{::token/word} "Expected ns name" (advance parser))
+    origin (expect* #{::token/lbrace} "Expected { after ns name" (:parser name))]
+    (cond 
+      (not (:success name)) (panic parser "Expected ns name" #{::token/newline})
+
+      (not (:success origin)) (panic (:parser name) "Expected { after ns name")
+
+      :else 
+      (loop [parser (accept-many #{::token/newline ::token/comma} (advance (:parser name)))
+       members {}
+       current_member nil]
+       (let [curr (current parser)]
+        (case (token-type parser)
+          ::token/rbrace (let [ms (add-member members current_member)]
+           (assoc (advance parser) ::ast
+             {::ast/type ::ast/ns
+              :name (::ast name)
+              :members ms}))
+
+          (::token/comma ::token/newline)
+          (recur
+            (accept-many #{::token/comma ::token/newline} parser)
+            (add-member members current_member) nil)
+
+          (::token/rbracket ::token/rparen)
+          (panic parser (str "Mismatched enclosure in ns: " (::token/lexeme curr)))
+
+          ::token/eof
+          (panic (assoc origin ::errors (::errors parser)) "Unterminated ns" ::token/eof)
+
+          ::token/word
+          (if (not current_member) (let [parsed (parse-word parser) word (get-in parsed [::ast :word])]
+           (recur parsed members {(keyword word) (::ast parsed)}))
+          (panic parser "ns entries must be single words or keyword+expression pairs." #{::token/rbrace}))
+
+          ::token/keyword
+          (if (not current_member) (let [kw (parse-atom parser) expr (parse-expr kw #{::token/comma ::token/newline ::token/rbrace})]
+           (recur expr members {(:value (::ast kw)) (::ast expr)}))
+          (panic parser "ns entries must be single words or keyword+expression pairs." #{::token/rbrace}))
+
+          (panic parser "ns entries must be single words or keyword+expression pairs" #{::token/rbrace})))))))
+
 (defn- parse-block [origin]
   (loop [parser (accept-many #{::token/newline ::token/semicolon} (advance origin))
    exprs []
@@ -697,6 +740,8 @@
 
        ::token/cond (parse-cond parser)
 
+       ::token/ns (parse-ns parser)
+
        ;; TODO: improve handling of comments?
        ;; Scanner now just skips comments
        ;; ::token/comment (advance parser)
@@ -717,11 +762,11 @@
     (parser)
     (parse-script)))
 
-(comment
+(do
   (def pp pp/pprint)
-  (def source "match foo with {
-    1 -> :foo
-    else -> bar
+  (def source "ns foo {
+    :bar 42
+    :baz 23
   }
 
   ")
@@ -772,7 +817,7 @@
   * This lets you do one let (with everything building up) and then a cond with bespoke errors/panics
   * This also still lets you encapsulate parsererrors with poisoned nodes
 
-")
+  ")