eliminate redundant directives in the same scope

2012-10-08 12:53:17 +03:00
parent 80a18fe2fa
commit 093a9031dc
1 changed files with 8 additions and 0 deletions
--- a/lib/compress.js
+++ b/lib/compress.js
@@ -194,12 +194,20 @@ merge(Compressor.prototype, {
        return statements;

        function eliminate_spurious_blocks(statements) {
+            var seen_dirs = [];
            return statements.reduce(function(a, stat){
                if (stat instanceof AST_BlockStatement) {
                    CHANGED = true;
                    a.push.apply(a, eliminate_spurious_blocks(stat.body));
                } else if (stat instanceof AST_EmptyStatement) {
                    CHANGED = true;
+                } else if (stat instanceof AST_Directive) {
+                    if (seen_dirs.indexOf(stat.value) < 0) {
+                        a.push(stat);
+                        seen_dirs.push(stat.value);
+                    } else {
+                        CHANGED = true;
+                    }
                } else {
                    a.push(stat);
                }