From 18f02c2d19070f303a0e1ec6940188641e667739 Mon Sep 17 00:00:00 2001
From: Tim Macdonald <tim@tsmacdonald.com>
Date: Fri, 3 Nov 2023 15:35:09 +0000
Subject: [PATCH] Support reader conditionals

---
 src/marginalia/parser.clj      | 10 ++++++----
 test/marginalia/parse_test.clj | 30 +++++++++++++++++++++---------
 2 files changed, 27 insertions(+), 13 deletions(-)

diff --git a/src/marginalia/parser.clj b/src/marginalia/parser.clj
index 9c116c7e..7c832927 100644
--- a/src/marginalia/parser.clj
+++ b/src/marginalia/parser.clj
@@ -4,9 +4,10 @@
 (ns marginalia.parser
   "Provides the parsing facilities for Marginalia."
   (:refer-clojure :exclude [replace])
-  (:use [clojure [string :only (join replace lower-case)]]
-        [cljs.tagged-literals :only [*cljs-data-readers*]]
-        [clojure.tools.namespace :only (read-file-ns-decl)]))
+  (:require
+   [cljs.tagged-literals :refer [*cljs-data-readers*]]
+   [clojure.string :refer [join replace lower-case]]
+   [clojure.tools.namespace :refer [read-file-ns-decl]]))
 
 
 ;; Extracted from clojure.contrib.reflect
@@ -175,7 +176,8 @@
        (let [start (.getLineNumber reader)
              form (binding [*comments* sub-level-comments]
                     (try (. clojure.lang.LispReader
-                            (read reader false :_eof false))
+                            (read reader {:read-cond :allow
+                                          :eof       :_eof}))
                          (catch Exception ex
                            (let [msg (str "Problem parsing near line " start
                                           " <" (.readLine reader) ">"
diff --git a/test/marginalia/parse_test.clj b/test/marginalia/parse_test.clj
index 3e70cf42..40700ab2 100644
--- a/test/marginalia/parse_test.clj
+++ b/test/marginalia/parse_test.clj
@@ -26,11 +26,23 @@
     (is (= :code type))
     (is (= "the docstring" docstring))))
 
+(def reader-conditional-fn
+  "(defn error
+  \"Returns a language-appropriate error\"
+  [^String msg]
+  #?(:clj  (Exception. msg)
+     :cljs (js/Error. msg)))")
+
+(deftest test-reader-conditional
+  (let [{:keys [type docstring]} (first (marginalia.parser/parse reader-conditional-fn))]
+    (is (= :code type))
+    (is (= "Returns a language-appropriate error" docstring))))
+
 (deftest inline-comments
   (testing "inline comments ignored by default"
     (binding [p/*comments-enabled* (atom true)]
       (let [result (p/parse
-                     "(ns test)
+                    "(ns test)
 
                      (defn foo
                        \"docstring\"
@@ -45,7 +57,7 @@
     (binding [p/*comments-enabled* (atom true)]
       ;; tests that prelude is appended to docstring
       (let [result (p/parse
-                     "(ns test)
+                    "(ns test)
 
                      ;; A
                      (defn foo
@@ -62,7 +74,7 @@
     (binding [p/*comments-enabled* (atom true)
               p/*lift-inline-comments* true]
       (let [result (p/parse
-                     "(ns test)
+                    "(ns test)
 
                      (defn foo
                        \"docstring\"
@@ -78,7 +90,7 @@
     (binding [p/*comments-enabled* (atom true)
               p/*lift-inline-comments* true]
       (let [result (p/parse
-                     "(ns test)
+                    "(ns test)
 
                      (defn foo
                        \"docstring\"
@@ -94,7 +106,7 @@
               p/*lift-inline-comments* true]
       ;; A and B should be separate paragraphs
       (let [result (p/parse
-                     "(ns test)
+                    "(ns test)
 
                      (defn foo
                        \"docstring\"
@@ -113,7 +125,7 @@
               p/*lift-inline-comments* true]
       ;; prelude A follows docstring, then B and C as separate paragraphs
       (let [result (p/parse
-                     "(ns test)
+                    "(ns test)
 
                      ;; A
                      (defn foo
@@ -133,7 +145,7 @@
               p/*lift-inline-comments* true]
       ;; this checks that consecutive comment lines stay in the same paragraph
       (let [result (p/parse
-                     "(ns test)
+                    "(ns test)
 
                      ;; A
                      (defn foo
@@ -155,7 +167,7 @@
       ;; this checks that a comment above the function doesn't merge in
       ;; when separated by a blank line
       (let [result (p/parse
-                     "(ns test)
+                    "(ns test)
 
                      ;; A
 
@@ -179,7 +191,7 @@
       ;; this checks that a comment above the function does merge in
       ;; when a blank comment joins it to the function
       (let [result (p/parse
-                     "(ns test)
+                    "(ns test)
 
                      ;; A
                      ;;