Keep track of directives while tokenizing

lib/parse.js

@@ -681,7 +681,9 @@ function parse($TEXT, options) {
         in_function     : 0,
         in_directives   : true,
         in_loop         : 0,
-        labels        : []
+        labels          : [],
+        directives      : {},
+        directive_stack : []
     };
 
     S.token = next();
@@ -738,6 +740,26 @@ function parse($TEXT, options) {
 
     function expect(punc) { return expect_token("punc", punc); };
 
+    function push_directives_stack() {
+        S.directive_stack.push([]);
+        S.in_directives = true;
+    }
+
+    function pop_directives_stack() {
+        var directives = S.directive_stack[S.directive_stack.length - 1];
+
+        for (var i = 0; i < directives.length; i++) {
+            S.directives[directives[i]]--;
+        }
+
+        S.directive_stack.pop();
+    }
+
+    function has_directive(directive) {
+        return S.directives[directive] !== undefined &&
+            S.directives[directive] > 0;
+    }
+
     function can_insert_semicolon() {
         return !options.strict && (
             S.token.nlb || is("eof") || is("punc", "}")
@@ -780,8 +802,15 @@ function parse($TEXT, options) {
         switch (S.token.type) {
           case "string":
             var dir = S.in_directives, stat = simple_statement();
-            // XXXv2: decide how to fix directives
             if (dir && stat.body instanceof AST_String && !is("punc", ",")) {
+                S.directive_stack[S.directive_stack.length - 1].push(stat.body.value);
+
+                if (S.directives[stat.body.value] === undefined) {
+                    S.directives[stat.body.value] = 1;
+                } else {
+                    S.directives[stat.body.value]++;
+                }
+
                 return new AST_Directive({
                     start : stat.body.start,
                     end   : stat.body.end,
@@ -1009,10 +1038,11 @@ function parse($TEXT, options) {
             })(true, []),
             body: (function(loop, labels){
                 ++S.in_function;
-                S.in_directives = true;
+                push_directives_stack();
                 S.in_loop = 0;
                 S.labels = [];
                 var a = block_();
+                pop_directives_stack();
                 --S.in_function;
                 S.in_loop = loop;
                 S.labels = labels;
@@ -1512,8 +1542,10 @@ function parse($TEXT, options) {
     return (function(){
         var start = S.token;
         var body = [];
+        push_directives_stack();
         while (!is("eof"))
             body.push(statement());
+        pop_directives_stack();
         var end = prev();
         var toplevel = options.toplevel;
         if (toplevel) {