From 9a08039adfe40f76b9d5a5351005671c15b557bf Mon Sep 17 00:00:00 2001
From: Eduardo Julian
Date: Mon, 24 Jan 2022 23:38:55 -0400
Subject: Added explicit function inlining.

---
 stdlib/source/library/lux/abstract/functor.lux     |  3 --
 .../source/library/lux/control/function/inline.lux | 50 ++++++++++++++++++++++
 stdlib/source/test/lux/control/function.lux        |  4 +-
 stdlib/source/test/lux/control/function/inline.lux | 32 ++++++++++++++
 4 files changed, 85 insertions(+), 4 deletions(-)
 create mode 100644 stdlib/source/library/lux/control/function/inline.lux
 create mode 100644 stdlib/source/test/lux/control/function/inline.lux

(limited to 'stdlib/source')

diff --git a/stdlib/source/library/lux/abstract/functor.lux b/stdlib/source/library/lux/abstract/functor.lux
index fb5f412a3..fb3dab4c8 100644
--- a/stdlib/source/library/lux/abstract/functor.lux
+++ b/stdlib/source/library/lux/abstract/functor.lux
@@ -9,9 +9,6 @@
             (-> (f a) (f b))))
       each)))
 
-(type: .public (Fix f)
-  (f (Fix f)))
-
 (type: .public (Or f g)
   (All (_ a) (.Or (f a) (g a))))
 
diff --git a/stdlib/source/library/lux/control/function/inline.lux b/stdlib/source/library/lux/control/function/inline.lux
new file mode 100644
index 000000000..ef0836888
--- /dev/null
+++ b/stdlib/source/library/lux/control/function/inline.lux
@@ -0,0 +1,50 @@
+(.using
+ [library
+  [lux "*"
+   ["[0]" meta]
+   [abstract
+    ["[0]" monad {"+" do}]]
+   [control
+    ["<>" parser
+     ["<[0]>" code {"+" Parser}]]]
+   [data
+    [collection
+     ["[0]" list ("[1]#[0]" monad)]]]
+   ["[0]" macro
+    ["[0]" code]
+    [syntax {"+" syntax:}
+     ["|[0]|" export]]]]])
+
+(def: declaration
+  (Parser [Text (List Code)])
+  (<code>.form (<>.and <code>.local_symbol (<>.some <code>.any))))
+
+(def: inline
+  (Parser [Code [Text (List Code)] Code Code])
+  (|export|.parser
+   ($_ <>.and
+       ..declaration
+       <code>.any
+       <code>.any
+       )))
+
+(syntax: .public (inline: [[privacy [name parameters] type term] ..inline])
+  (do [! meta.monad]
+    [@ meta.current_module_name
+     g!parameters (|> (macro.symbol "parameter")
+                      (list.repeated (list.size parameters))
+                      (monad.all !))
+     .let [inlined (` (("lux in-module"
+                        (~ (code.text @))
+                        (.: (~ type)
+                            (.function ((~ (code.local_symbol name)) (~+ parameters))
+                              (~ term))))
+                       (~+ (list#each (function (_ g!parameter)
+                                        (` ((~' ~) (~ g!parameter))))
+                                      g!parameters))))
+           g!parameters (|> g!parameters
+                            (list#each (function (_ parameter)
+                                         (list parameter (` (~! <code>.any)))))
+                            list#conjoint)]]
+    (in (list (` ((~! syntax:) (~ privacy) ((~ (code.local_symbol name)) [(~+ g!parameters)])
+                  (.# (~! meta.monad) (~' in) (.list (.`' (~ inlined))))))))))
diff --git a/stdlib/source/test/lux/control/function.lux b/stdlib/source/test/lux/control/function.lux
index d9444edd1..eed6c9635 100644
--- a/stdlib/source/test/lux/control/function.lux
+++ b/stdlib/source/test/lux/control/function.lux
@@ -17,7 +17,8 @@
    ["[1][0]" contract]
    ["[1][0]" memo]
    ["[1][0]" mixin]
-   ["[1][0]" mutual]])
+   ["[1][0]" mutual]
+   ["[1][0]" inline]])
 
 (def: .public test
   Test
@@ -62,4 +63,5 @@
             /memo.test
             /mixin.test
             /mutual.test
+            /inline.test
             ))))
diff --git a/stdlib/source/test/lux/control/function/inline.lux b/stdlib/source/test/lux/control/function/inline.lux
new file mode 100644
index 000000000..7c05e39e0
--- /dev/null
+++ b/stdlib/source/test/lux/control/function/inline.lux
@@ -0,0 +1,32 @@
+(.using
+ [library
+  [lux "*"
+   ["_" test {"+" Test}]
+   [abstract
+    [monad {"+" do}]]
+   [math
+    ["[0]" random]
+    [number
+     ["i" int]]]]]
+ [\\library
+  ["[0]" /]])
+
+(template: (!quadrance/2 m0 m1)
+  [(i.+ (i.* m0 m0) (i.* m1 m1))])
+
+(/.inline: .public (quadrance/2 m0 m1)
+  (-> Int Int Int)
+  (!quadrance/2 m0 m1))
+
+(def: .public test
+  Test
+  (<| (_.covering /._)
+      (do [! random.monad]
+        [.let [measurement (# ! each (i.% +1000) random.int)]
+         m0 measurement
+         m1 measurement])
+      ($_ _.and
+          (_.cover [/.inline:]
+                   (i.= (..!quadrance/2 m0 m1)
+                        (..quadrance/2 m0 m1)))
+          )))
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