Add js2-mode-assume-strict custom variable

This allows all files to be parsed as if 'use strict' were on top of
every file, for the case of JS passed through compilers that assume
strict input.

Closes #341.

diff --git a/js2-mode.el b/js2-mode.el
index 4d9bbf8da02e85ea35cb873dcb0bb879874c4951..a46423e60a31b97cee977b0766b8d6a35657dec4 100644 (file)
--- a/js2-mode.el
+++ b/js2-mode.el
@@ -277,6 +277,11 @@ end of the line, otherwise, at the beginning of the next line."
   :type 'boolean
   :group 'js2-mode)
 
+(defcustom js2-mode-assume-strict nil
+  "Non-nil to start files in strict mode automatically."
+  :type 'boolean
+  :group 'js2-mode)
+
 (defcustom js2-mode-show-strict-warnings t
   "Non-nil to emit Ecma strict-mode warnings.
 Some of the warnings can be individually disabled by other flags,
@@ -7988,7 +7993,7 @@ Scanner should be initialized."
           js2-nesting-of-function 0
           js2-labeled-stmt nil
           js2-recorded-identifiers nil  ; for js2-highlight
-          js2-in-use-strict-directive nil)
+          js2-in-use-strict-directive js2-mode-assume-strict)
     (while (/= (setq tt (js2-get-token)) js2-EOF)
       (if (= tt js2-FUNCTION)
           (progn