From 41d80f41faa1cb47ee4430fbe0b3b73007915b47 Mon Sep 17 00:00:00 2001
From: Jimmy Miller <jimmy@healthfinch.com>
Date: Thu, 6 Sep 2018 01:38:13 -0400
Subject: [PATCH] Change to symbols with question marks

---
 .../src/pattern_matcher/core.clj              | 22 +++++------
 .../query-engine/src/query_engine/core.clj    | 38 +++++++++----------
 .../clojure/unifier/src/unifier/core.clj      | 32 ++++++++--------
 3 files changed, 46 insertions(+), 46 deletions(-)

diff --git a/libraries/clojure/pattern-matcher/src/pattern_matcher/core.clj b/libraries/clojure/pattern-matcher/src/pattern_matcher/core.clj
index dbbea31..dea88a9 100644
--- a/libraries/clojure/pattern-matcher/src/pattern_matcher/core.clj
+++ b/libraries/clojure/pattern-matcher/src/pattern_matcher/core.clj
@@ -22,8 +22,6 @@
      (match args# ~@patterns)))
 
 
-
-
 (comment
   (match true
          true false
@@ -35,30 +33,30 @@
 
 
   (match [1 2 3]
-         [x]     {:x x}
-         [x y]   {:x x :y y}
-         [x y z] {:x x :y y :z z})
+         [?x]       {:x ?x}
+         [?x ?y]    {:x ?x :y ?y}
+         [?x ?y ?z] {:x ?x :y ?y :z ?z})
 
 
   (match [1 2 1]
-         [x y x] {:x x :y y}
-         [x y z] {:x x :y y :z z})
+         [?x ?y ?x] {:x ?x :y ?y}
+         [?x ?y ?z] {:x ?x :y ?y :z ?z})
 
 
   (defmatch fib
     [0] 0
     [1] 1
-    [n] (+ (fib (- n 1))
-           (fib (- n 2))))
+    [?n] (+ (fib (- ?n 1))
+            (fib (- ?n 2))))
 
 
   (fib 5)
   (fib 10)
 
   (defmatch get-x
-    [x] x
-    [x y] x
-    [x y z] x)
+    [?x] ?x
+    [?x ?y] ?x
+    [?x ?y ?z] ?x)
 
   (get-x 1)
   (get-x 1 2)
diff --git a/libraries/clojure/query-engine/src/query_engine/core.clj b/libraries/clojure/query-engine/src/query_engine/core.clj
index c198b22..d697962 100644
--- a/libraries/clojure/query-engine/src/query_engine/core.clj
+++ b/libraries/clojure/query-engine/src/query_engine/core.clj
@@ -39,35 +39,35 @@
 
   
 
-  (q {:find {:name name}
-      :where [[_ :name name]]}
+  (q {:find {:name ?name}
+      :where [[?_ :name ?name]]}
      db)
 
 
-  (q {:find {:name name
-             :age age}
-      :where [[e :name name]
-              [e :age age]]}
+  (q {:find {:name ?name
+             :age ?age}
+      :where [[?e :name ?name]
+              [?e :age ?age]]}
      db)
 
 
 
 
-  (q {:find {:name1 name1
-             :name2 name2}
-      :where [[e1 :name name1]
-              [e2 :name name2]
-              [e1 :age age]
-              [e2 :age age]]}
+  (q {:find {:name1 ?name1
+             :name2 ?name2}
+      :where [[?e1 :name ?name1]
+              [?e2 :name ?name2]
+              [?e1 :age ?age]
+              [?e2 :age ?age]]}
      db)
 
 
 
-  (q {:find {:name name
-             :address-line-1 address-line-1
-             :city city}
-      :where [[e :name name]
-              [a :address e]
-              [a :address-line-1 address-line-1]
-              [a :city city]]}
+  (q {:find {:name ?name
+             :address-line-1 ?address-line-1
+             :city ?city}
+      :where [[?e :name ?name]
+              [?a :address ?e]
+              [?a :address-line-1 ?address-line-1]
+              [?a :city ?city]]}
      db))
diff --git a/libraries/clojure/unifier/src/unifier/core.clj b/libraries/clojure/unifier/src/unifier/core.clj
index f33ba33..56b9aa8 100644
--- a/libraries/clojure/unifier/src/unifier/core.clj
+++ b/libraries/clojure/unifier/src/unifier/core.clj
@@ -1,9 +1,11 @@
 (ns unifier.core
   (:import (clojure.lang Sequential))
-  (:require [clojure.walk]))
+  (:require [clojure.walk]
+            [clojure.string :as string]))
 
 (defn variable? [x]
-  (symbol? x))
+  (and (symbol? x)
+       (string/starts-with? (name x) "?")))
 
 (defn add-var [env var val]
   (assoc env var val))
@@ -57,23 +59,23 @@
 (comment
 
   (-> {}
-      (unify 'x 2)
-      (unify 'y 'x)
-      (unify 'z 'y)
-      (lookup 'z))
+      (unify '?x 2)
+      (unify '?y '?x)
+      (unify '?z '?y)
+      (lookup '?z))
 
   (-> {}
-      (unify 'x 'y)
-      (unify 'y 'z)
-      (unify 'z 2)
-      (lookup 'x))
+      (unify '?x '?y)
+      (unify '?y '?z)
+      (unify '?z 2)
+      (lookup '?x))
 
 
   (-> {}
-      (unify 2 'x)
-      (unify 'x 'y)
-      (unify 'z 'y)
-      (lookup 'z))
+      (unify 2 '?x)
+      (unify '?x '?y)
+      (unify '?z '?y)
+      (lookup '?z))
 
 
-  (substitute '[{x 3} [x [x [x [x [x [[x]]]]]]]]))
+  (substitute '[{?x 3} [?x [?x [?x [?x [?x [[?x]]]]]]]]))