Add simple optimization for empty-string concats.

ref. #43
2012-11-12 15:41:03 +01:00 · 2012-11-12 15:41:03 +01:00 · f96f796f71
commit f96f796f71
parent a9fa178f86
1 changed files with 5 additions and 0 deletions
--- a/lib/compress.js
+++ b/lib/compress.js
@ -1642,6 +1642,11 @@ merge(Compressor.prototype, {
              case "<=": reverse(">="); break;
            }
        }
+        if (self.operator == "+" && self.right instanceof AST_String
+            && self.right.getValue() === "" && self.left instanceof AST_Binary
+            && self.left.operator == "+" && self.left.left instanceof AST_String) {
+            return self.left;
+        }
        return self;
    });