From db7cd221444afce64803e66594d56dc8e7a0843c Mon Sep 17 00:00:00 2001
From: Adam Chlipala <adamc@hcoop.net>
Date: Tue, 10 Mar 2009 10:44:26 -0400
Subject: Avoid any JavaScript when pages don't need it; update demo prose

---
 src/scriptcheck.sml | 123 ++++++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 123 insertions(+)
 create mode 100644 src/scriptcheck.sml

(limited to 'src/scriptcheck.sml')

diff --git a/src/scriptcheck.sml b/src/scriptcheck.sml
new file mode 100644
index 00000000..bfe87766
--- /dev/null
+++ b/src/scriptcheck.sml
@@ -0,0 +1,123 @@
+(* Copyright (c) 2009, Adam Chlipala
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions are met:
+ *
+ * - Redistributions of source code must retain the above copyright notice,
+ *   this list of conditions and the following disclaimer.
+ * - Redistributions in binary form must reproduce the above copyright notice,
+ *   this list of conditions and the following disclaimer in the documentation
+ *   and/or other materials provided with the distribution.
+ * - The names of contributors may not be used to endorse or promote products
+ *   derived from this software without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
+ * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+ * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
+ * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR 
+ * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
+ * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
+ * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
+ * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
+ * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
+ * POSSIBILITY OF SUCH DAMAGE.
+ *)
+
+structure ScriptCheck :> SCRIPT_CHECK = struct
+
+open Cjr
+
+structure SS = BinarySetFn(struct
+                           type ord_key = string
+                           val compare = String.compare
+                           end)
+structure IS = IntBinarySet
+
+val csBasis = SS.addList (SS.empty,
+                          ["new_client_source",
+                           "get_client_source",
+                           "set_client_source",
+                           "alert"])
+
+fun classify (ds, ps) =
+    let
+        fun inString {needle, haystack} =
+            let
+                val (_, suffix) = Substring.position needle (Substring.full haystack)
+            in
+                not (Substring.isEmpty suffix)
+            end
+
+        fun hasClient csids =
+            let
+                fun hasClient e =
+                    case #1 e of
+                        EPrim (Prim.String s) => inString {needle = "<script", haystack = s}
+                      | EPrim _ => false
+                      | ERel _ => false
+                      | ENamed n => IS.member (csids, n)
+                      | ECon (_, _, NONE) => false
+                      | ECon (_, _, SOME e) => hasClient e
+                      | ENone _ => false
+                      | ESome (_, e) => hasClient e
+                      | EFfi ("Basis", x) => SS.member (csBasis, x)
+                      | EFfi _ => false
+                      | EFfiApp ("Basis", x, es) => SS.member (csBasis, x)
+                                                    orelse List.exists hasClient es
+                      | EFfiApp (_, _, es) => List.exists hasClient es
+                      | EApp (e, es) => hasClient e orelse List.exists hasClient es
+                      | EUnop (_, e) => hasClient e
+                      | EBinop (_, e1, e2) => hasClient e1 orelse hasClient e2
+                      | ERecord (_, xes) => List.exists (hasClient o #2) xes
+                      | EField (e, _) => hasClient e
+                      | ECase (e, pes, _) => hasClient e orelse List.exists (hasClient o #2) pes
+                      | EError (e, _) => hasClient e
+                      | EWrite e => hasClient e
+                      | ESeq (e1, e2) => hasClient e1 orelse hasClient e2
+                      | ELet (_, _, e1, e2) => hasClient e1 orelse hasClient e2
+                      | EQuery {query, body, initial, ...} => hasClient query orelse hasClient body
+                                                              orelse hasClient initial
+                      | EDml {dml, ...} => hasClient dml
+                      | ENextval {seq, ...} => hasClient seq
+                      | EUnurlify (e, _) => hasClient e
+            in
+                hasClient
+            end
+
+        fun decl ((d, _), csids) =
+            let
+                val hasClient = hasClient csids
+            in
+                case d of
+                    DVal (_, n, _, e) => if hasClient e then
+                                             IS.add (csids, n)
+                                         else
+                                             csids
+                  | DFun (_, n, _, _, e) => if hasClient e then
+                                                IS.add (csids, n)
+                                            else
+                                                csids
+                  | DFunRec xes => if List.exists (fn (_, _, _, _, e) => hasClient e) xes then
+                                       foldl (fn ((_, n, _, _, _), csids) => IS.add (csids, n))
+                                             csids xes
+                                   else
+                                       csids
+                  | _ => csids
+            end
+
+        val csids = foldl decl IS.empty ds
+
+        val ps = map (fn (ek, x, n, ts, t, _) =>
+                         (ek, x, n, ts, t,
+                          if IS.member (csids, n) then
+                              ServerAndClient
+                          else
+                              ServerOnly)) ps
+    in
+        (ds, ps)
+    end
+
+end
+
-- 
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