* Very early start on PEG.js based ACS grammar

misc/acs_parser.pegjs

@@ -0,0 +1,72 @@
+
+{
+	var user = options.user;
+
+	function checkAcs(name, value) {
+		return {
+			ID	: function userId(value) {
+				return user.userId === value;
+			}
+		}[name](value) || false;
+	}
+
+  function check(name, value) {
+    // Dummy implementation: returns true when the name starts with 'A'
+    return name.charAt(0) == 'A';
+  }
+}
+
+start
+ = expr
+
+expr
+ = or_expr
+
+or_expr
+ = left:and_expr '|' right:expr { return left || right; }
+ / and_expr
+
+and_expr
+ = left:not_expr '&'? right:expr { return left && right; }
+ / not_expr
+
+not_expr
+ = '!' value:atom { return !value; }
+ / atom
+
+atom
+ = acs_check
+ / '(' value:expr ')' { return value; }
+
+comma = ','
+ws = ' '
+
+optionalSpc = ws*
+
+acs_check
+ = n:name a:arg { return checkAcs(n, a); }
+
+name
+ = c:([A-Z][A-Z]) { return c.join(''); }
+
+argNum
+ = c:[A-Za-z]+ { return c.join('') }
+
+argVar
+ = a:[A-Za-z0-9\-]+ { return a.join('') }
+
+commaList
+ = start:(v:argVar comma { return v; })* last:argVar { return start.concat(last); }
+
+allList
+ = '{' l:commaList '}' { return l; }
+
+anyList
+ = '[' l:commaList ']' { return l; }
+
+arg
+ = allList
+ / anyList
+ / c:[A-Za-z]+ { return c.join(''); }
+ / d:[0-9]* { return d ? parseInt(d.join(''), 10) : null; }
+