1 files changed, 80 insertions, 0 deletions
diff --git a/src/lux/reader.clj b/src/lux/reader.clj
new file mode 100644
index 000000000..b4824261a
--- /dev/null
+++ b/src/lux/reader.clj
@@ -0,0 +1,80 @@
+(ns lux.reader
+  (:require [clojure.string :as string]
+            [clojure.core.match :as M :refer [matchv]]
+            clojure.core.match.array
+            [lux.base :as & :refer [exec return* return fail fail* |let]]))
+
+;; [Utils]
+(defn ^:private with-line [body]
+  (fn [state]
+    (matchv ::M/objects [(&/get$ "lux;source" state)]
+      [["lux;None" _]]
+      (fail* "[Reader Error] No source code.")
+
+      [["lux;Some" ["lux;Nil" _]]]
+      (fail* "[Reader Error] EOF")
+
+      [["lux;Some" ["lux;Cons" [["lux;Meta" [[file-name line-num column-num] line]]
+                                more]]]]
+      (matchv ::M/objects [(body file-name line-num column-num line)]
+        [["No" msg]]
+        (fail* msg)
+
+        [["Yes" [meta ["lux;None" _]]]]
+        (return* (&/set$ "lux;source" (&/V "lux;Some" more) state)
+                 meta)
+
+        [["Yes" [meta ["lux;Some" line-meta]]]]
+        (return* (&/set$ "lux;source" (&/V "lux;Some" (&/|cons line-meta more)) state)
+                 meta))
+      )))
+
+;; [Exports]
+(defn read-regex [regex]
+  (with-line
+    (fn [file-name line-num column-num line]
+      (if-let [[match] (re-find regex line)]
+        (let [match-length (.length match)
+              line* (.substring line match-length)]
+          (&/V "Yes" (&/T (&/V "lux;Meta" (&/T (&/T file-name line-num column-num) match))
+                          (if (empty? line*)
+                            (&/V "lux;None" nil)
+                            (&/V "lux;Some" (&/V "lux;Meta" (&/T (&/T file-name line-num (+ column-num match-length)) line*)))))))
+        (&/V "No" (str "[Reader Error] Pattern failed: " regex))))))
+
+(defn read-regex2 [regex]
+  (with-line
+    (fn [file-name line-num column-num line]
+      (if-let [[match tok1 tok2] (re-find regex line)]
+        (let [match-length (.length match)
+              line* (.substring line match-length)]
+          (&/V "Yes" (&/T (&/V "lux;Meta" (&/T (&/T file-name line-num column-num) [tok1 tok2]))
+                          (if (empty? line*)
+                            (&/V "lux;None" nil)
+                            (&/V "lux;Some" (&/V "lux;Meta" (&/T (&/T file-name line-num (+ column-num match-length)) line*)))))))
+        (&/V "No" (str "[Reader Error] Pattern failed: " regex))))))
+
+(defn read-text [text]
+  (with-line
+    (fn [file-name line-num column-num line]
+      ;; (prn 'read-text text line)
+      (if (.startsWith line text)
+        (let [match-length (.length text)
+              line* (.substring line match-length)]
+          (&/V "Yes" (&/T (&/V "lux;Meta" (&/T (&/T file-name line-num column-num) text))
+                          (if (empty? line*)
+                            (&/V "lux;None" nil)
+                            (&/V "lux;Some" (&/V "lux;Meta" (&/T (&/T file-name line-num (+ column-num match-length)) line*)))))))
+        (&/V "No" (str "[Reader Error] Text failed: " text))))))
+
+(defn from [file-name]
+  (let [lines (&/->list (string/split-lines (slurp file-name)))]
+    (&/|map (fn [line+line-num]
+              (|let [[line line-num] line+line-num]
+                (&/V "lux;Meta" (&/T (&/T file-name line-num 0)
+                                     line))))
+            (&/|filter (fn [line+line-num]
+                         (|let [[line line-num] line+line-num]
+                           (not (empty? line))))
+                       (&/zip2 lines
+                               (&/|range (&/|length lines)))))))