Fix line number reporting bugs: look for lines in the right place.

src/ludus/error.cljc

@@ -1,7 +1,7 @@
 (ns ludus.error
  	(:require [clojure.string :as string]))
 
-(defn get-line [source {:keys [line]}]
+(defn get-line [source line]
  	(let [lines (string/split-lines source)
      			the_line (nth lines (dec line))]
  			the_line))
@@ -21,22 +21,26 @@
 
 (defn scan-error [] :TODO)
 
-(defn parse-error [source {:keys [trace token]}]
- 	(let [line (get-line source token)
+(defn parse-error [{:keys [trace token]}]
+ 	(let [source (:source token)
+     			input (:input token)
+     			line-num (:line token)
+     			line (get-line source line-num)
       		line-num (:line token)
       		prefix (str line-num ": ")
       		underline (get-underline source token (count prefix))
       		expected (first trace)
       		got (:type token)
-      		message (str "Ludus found a parsing error on line " line-num ".\nExpected: " expected "\nGot: " got "\n")
+      		message (str "Ludus found a parsing error on line " line-num " in " input ".\nExpected: " expected "\nGot: " got "\n")
       		]
   		(str message "\n" prefix line "\n" underline)
   		)
  	)
 
-(defn run-error [source {:keys [line message]}]
+(defn run-error [{:keys [message token line]}]
+ 	(let [source (:source token) input (:input token)]
    	(if line
-  		(str "Ludus panicked on line " line ":\n" (get-line source {:line line}) "\n" message)
+    		(str "Ludus panicked!: " message "\nOn line " line " in " input "\n" (get-line source line))
     		(str "Ludus panicked!\n" message)
-  		))
+    		)))
 

src/ludus/interpreter.cljc

@@ -915,11 +915,11 @@
   (into {} (map-keys kw->str) ns))
 
 (def ludus-prelude 
-  (let [scanned (scanner/scan prelude/prelude)
+  (let [scanned (scanner/scan prelude/prelude "prelude")
         parsed (p/apply-parser g/script (:tokens scanned))
         ; _ (println "Parse status: " (:status parsed))
         ; _ (if (= :err (:status parsed))
-        ;     (throw (ex-info (error/parse-error prelude/prelude parsed) {})))
+        ;     (throw (ex-info (error/parse-error parsed) {})))
         base-ctx (volatile! {::parent (volatile! {"base" base/base})})
         interpreted (interpret-ast parsed base-ctx)
         namespace (dissoc interpreted ::data/type ::data/name ::data/struct)
@@ -980,6 +980,7 @@
         ;(pp/pprint (ex-data e))
         ;(throw e)
         {::data/error true 
+         :token (get-in (ex-data e) [:ast :token])
          :line (get-in (ex-data e) [:ast :token :line])
          :message (ex-message e)}
         ))))
@@ -991,12 +992,13 @@
       (interpret-ast parsed base-ctx)
       (catch Throwable e
         {::data/error true
+         :token (get-in (ex-data e) [:ast :token])
          :line (get-in (ex-data e) [:ast :token :line])
          :message (ex-message e)}))))
 
 
 ;; repl
-(do
+(comment
  
   (println "***********")
 
@@ -1004,7 +1006,7 @@
     panic! (:oh, :no)
 ")
 
-  (def tokens (-> source scanner/scan :tokens))
+  (def tokens (-> source (scanner/scan "test input") :tokens))
 
   (def ast (p/apply-parser g/script tokens))
 

src/ludus/node.cljc

@@ -31,12 +31,12 @@
  	#?(:clj value :cljs (clj->js value)))
 
 (defn run [source]
- 	(let [user_scanned (s/scan source)
+ 	(let [user_scanned (s/scan source "user input")
       		user_tokens (:tokens user_scanned)
       		user_parsed (p/apply-parser g/script user_tokens)
       		user_result (i/interpret-safe source user_parsed {})
       		result_str (show/show user_result)
-      		post_scanned (s/scan pre/postlude)
+      		post_scanned (s/scan pre/postlude "postlude")
       		post_tokens (:tokens post_scanned)
       		post_parsed (p/apply-parser g/script post_tokens)
       		post_result (i/interpret-safe source post_parsed {})
@@ -48,22 +48,24 @@
      	(clean-out {:errors (:errors user_tokens)})
 
      	(= :err (:status user_parsed))
-     	(clean-out {:errors [(error/parse-error source user_parsed)]})
+     	(clean-out {:errors [(error/parse-error user_parsed)]})
 
      	(::data/error user_result)
-     	(clean-out (assoc (ld->clj post_result) :errors [(error/run-error source user_result)]))
+     	(clean-out (assoc (ld->clj post_result) :errors [(error/run-error user_result)]))
 
      	:else
      	(clean-out clj_result)
      	)
    	))
 
-(do
+(comment
+  (def source "
 
-  (def source "panic! :oops")
+    a b c
 
-  (def tokens (s/scan source))
+    ")
 
+  (-> source run :errors println)
   )
 
 

src/ludus/prelude.ld

@@ -897,10 +897,10 @@ fn unwrap_or {
 
 fn assert! {
 	"Asserts a condition: returns the value if the value is truthy, panics if the value is falsy. Takes an optional message."
-	(value) -> if value then value else panic! string ("Assert failed", value)
-	(value, message) -> if value 
+	(value) -> if value then value else panic! string ("Assert failed:", value)
+	(msg, value) -> if value 
 		then value 
-		else panic! string ("Assert failed:", message, value)
+		else panic! string ("Assert failed: ", msg, " with ", value)
 }
 
 &&& Turtle & other graphics

src/ludus/scanner.cljc

@@ -51,8 +51,9 @@
 
 (defn- new-scanner
   "Creates a new scanner."
-  [source]
+  [source input]
   {:source source
+   :input input
    :length (count source)
    :errors []
    :start 0
@@ -135,7 +136,9 @@
        (current-lexeme scanner)
        literal
        (:line scanner)
-       (:start scanner)))))
+       (:start scanner)
+       (:source scanner)
+       (:input scanner)))))
 
 ;; TODO: errors should also be in the vector of tokens
 ;; The goal is to be able to be able to hand this to an LSP?
@@ -146,7 +149,9 @@
                 (current-lexeme scanner)
                 nil
                 (:line scanner)
-                (:start scanner))
+                (:start scanner)
+                (:source scanner)
+                (:input scanner))
         err-token (assoc token :message msg)]
     (-> scanner
       (update :errors conj err-token)
@@ -240,7 +245,7 @@
          comm (str char)]
     (let [char (current-char scanner)]
       (if (= \newline char)
-        (update scanner :line inc)
+        scanner
         (recur (advance scanner) (str comm char))))))
 
 (defn- scan-token [scanner]
@@ -322,8 +327,8 @@
 (defn- next-token [scanner]
   (assoc scanner :start (:current scanner)))
 
-(defn scan [source]
-  (loop [scanner (new-scanner source)]
+(defn scan [source input]
+  (loop [scanner (new-scanner source input)]
     (if (at-end? scanner)
       (let [scanner (add-token (add-token scanner :break) :eof)]
         {:tokens (:tokens scanner)

src/ludus/token.cljc

@@ -1,9 +1,11 @@
 (ns ludus.token)
 
 (defn token
-  [type text literal line start]
+  [type text literal line start source input]
   {:type type
    :lexeme text
    :literal literal
    :line line
+   :source source
+   :input input
    :start start})

target/repl-port

@@ -1 +0,0 @@
-51828