From b72c81f8090c1326fe819ea4c0a2714c0944b8e8 Mon Sep 17 00:00:00 2001
From: Pierre-Yves Strub <pierre-yves@strub.nu>
Date: Fri, 29 Jan 2016 14:59:42 +0100
Subject: Import EasyCrypt PG mode

---
 easycrypt/easycrypt-hooks.el | 63 ++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 63 insertions(+)
 create mode 100644 easycrypt/easycrypt-hooks.el

(limited to 'easycrypt/easycrypt-hooks.el')

diff --git a/easycrypt/easycrypt-hooks.el b/easycrypt/easycrypt-hooks.el
new file mode 100644
index 00000000..22669c3a
--- /dev/null
+++ b/easycrypt/easycrypt-hooks.el
@@ -0,0 +1,63 @@
+(require 'span)
+(require 'proof)
+
+(defvar easycrypt-last-but-one-statenum 0)
+(defvar easycrypt-proof-weak-mode nil)
+
+;; Proof mode
+(defun easycrypt-proof-weak-mode-toggle ()
+  "Toggle EasyCrypt check mode."
+  (interactive)
+  (cond
+     (easycrypt-proof-weak-mode
+        (proof-shell-invisible-cmd-get-result "pragma Proofs:check"))
+     (t (proof-shell-invisible-cmd-get-result "pragma Proofs:weak")))
+  (if
+      (eq 'error proof-shell-last-output-kind)
+      (message "Failed to set proof mode")))
+
+;; Function for set or get the information in the span
+(defsubst easycrypt-get-span-statenum (span)
+  "Return the state number of the SPAN."
+  (span-property span 'statenum))
+
+(defsubst easycrypt-set-span-statenum (span val)
+  "Set the state number of the SPAN to VAL."
+  (span-set-property span 'statenum val))
+
+(defsubst proof-last-locked-span ()
+  (with-current-buffer proof-script-buffer
+  (span-at (- (proof-unprocessed-begin) 1) 'type)))
+
+(defun easycrypt-last-prompt-info (s)
+  "Extract the information from prompt."
+  (let ((lastprompt (or s (error "no prompt"))))
+     (when (string-match "\\[\\([0-9]+\\)|\\(\\sw+\\)\\]" lastprompt)
+           (list (string-to-number (match-string 1 lastprompt))
+                 (if (equal (match-string 2 lastprompt) "weakcheck") t nil)))))
+
+(defun easycrypt-last-prompt-info-safe ()
+  "Take from `proof-shell-last-prompt' the last information in the prompt."
+  (easycrypt-last-prompt-info proof-shell-last-prompt))
+
+(defun easycrypt-set-state-infos ()
+  "Set information necessary for backtracking."
+  (if proof-shell-last-prompt
+     ;; infos = prompt infos of the very last prompt
+     ;; sp    = last locked span, which we want to fill with prompt infos
+     (let ((sp    (if proof-script-buffer (proof-last-locked-span)))
+           (infos (or (easycrypt-last-prompt-info-safe) '(0 nil))))
+
+       (unless (or (not sp) (easycrypt-get-span-statenum sp))
+         (easycrypt-set-span-statenum sp easycrypt-last-but-one-statenum))
+       (setq easycrypt-last-but-one-statenum (car infos))
+       (setq easycrypt-proof-weak-mode (car (cdr infos)))
+     )))
+
+(add-hook 'proof-state-change-hook 'easycrypt-set-state-infos)
+
+(defun easycrypt-find-and-forget (span)
+  (let ((span-staten (easycrypt-get-span-statenum span)))
+       (list (format "undo %s." (int-to-string span-staten)))))
+
+(provide 'easycrypt-hooks)
-- 
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