From d87d4ad3a6d2ec2804cb7b20128fecb6d9df4e6e Mon Sep 17 00:00:00 2001
From: Alasdair Armstrong
Date: Thu, 25 Jan 2018 00:30:24 +0000
Subject: Add simple conditional processing and file include

Can now use C-style include declarations to include files within other sail files. This is done in such a way that all the location information is preserved in error messages. As an example:

$include "aarch64/prelude.sail"
$define SYM
$ifndef SYM
$include <../util.sail>
$endif

would include the file aarch64/prelude.sail relative to the file where the include is contained. It then defines a symbol SYM and includes another file if it is not defined. The <../util.sail> include will be accessed relative to $SAIL_DIR/lib, so $SAIL_DIR/lib/../util.sail in this case.

This can be used with the standard C trick of

$ifndef ONCE
$define ONCE
val f : unit -> unit
$endif

so no matter how many sail files include the above file, the valspec for f will only appear once.

Currently we just have $include, $define, $ifdef and $ifndef (with $else and $endif). We're using $ rather than # because # is already used in internal identifiers, although this could be switched.
---
 editors/sail2-mode.el | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

(limited to 'editors')

diff --git a/editors/sail2-mode.el b/editors/sail2-mode.el
index e17b1a4f..eb3e0fe6 100644
--- a/editors/sail2-mode.el
+++ b/editors/sail2-mode.el
@@ -19,7 +19,7 @@
   '("vector" "int" "nat" "atom" "range" "unit" "bit" "real" "list" "bool" "string" "bits"))
 
 (defconst sail2-special
-  '("_prove"))
+  '("_prove" "$define" "$include" "$ifdef" "$ifndef" "$else" "$endif"))
 
 (defconst sail2-font-lock-keywords
   `((,(regexp-opt sail2-keywords 'symbols) . font-lock-keyword-face)
-- 
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