v2.8.3

Patched up `make_node()` without `orig`.

There may be other cases where `start` could be missing, so make it print "undefined" instead of crashing.

fixes #1518

README.md

@@ -621,7 +621,7 @@ function uglify(ast, options, mangle) {
 
   // Compression
   uAST.figure_out_scope();
-  uAST = uAST.transform(UglifyJS.Compressor(options));
+  uAST = UglifyJS.Compressor(options).compress(uAST);
 
   // Mangling (optional)
   if (mangle) {
@@ -865,7 +865,7 @@ toplevel.figure_out_scope()
 Like this:
 ```javascript
 var compressor = UglifyJS.Compressor(options);
-var compressed_ast = toplevel.transform(compressor);
+var compressed_ast = compressor.compress(toplevel);
 ```
 
 The `options` can be missing.  Available options are discussed above in

lib/compress.js

@@ -61,7 +61,7 @@ function Compressor(options, false_by_default) {
         booleans      : !false_by_default,
         loops         : !false_by_default,
         unused        : !false_by_default,
-        toplevel      : !!options["top_retain"],
+        toplevel      : !!(options && options["top_retain"]),
         top_retain    : null,
         hoist_funs    : !false_by_default,
         keep_fargs    : true,
@@ -70,7 +70,7 @@ function Compressor(options, false_by_default) {
         if_return     : !false_by_default,
         join_vars     : !false_by_default,
         collapse_vars : !false_by_default,
-        reduce_vars   : false,
+        reduce_vars   : !false_by_default,
         cascade       : !false_by_default,
         side_effects  : !false_by_default,
         pure_getters  : false,
@@ -187,8 +187,8 @@ merge(Compressor.prototype, {
                 if (node instanceof AST_SymbolRef) {
                     var d = node.definition();
                     d.references.push(node);
-                    if (!d.modified && (d.orig.length > 1 || isModified(node, 0))) {
+                    if (d.fixed && (d.orig.length > 1 || isModified(node, 0))) {
-                        d.modified = true;
+                        d.fixed = false;
                     }
                 }
                 if (node instanceof AST_Call && node.expression instanceof AST_Function) {
@@ -205,7 +205,7 @@ merge(Compressor.prototype, {
         this.walk(tw);
 
         function reset_def(def) {
-            def.modified = false;
+            def.fixed = true;
             def.references = [];
             def.should_replace = undefined;
             if (unsafe && def.init) {
@@ -1148,11 +1148,14 @@ merge(Compressor.prototype, {
         def(AST_Statement, function(){
             throw new Error(string_template("Cannot evaluate a statement [{file}:{line},{col}]", this.start));
         });
+        // XXX: AST_Accessor and AST_Function both inherit from AST_Scope,
+        // which itself inherits from AST_Statement; however, they aren't
+        // really statements.  This could bite in other places too. :-(
+        // Wish JS had multiple inheritance.
+        def(AST_Accessor, function(){
+            throw def;
+        });
         def(AST_Function, function(){
-            // XXX: AST_Function inherits from AST_Scope, which itself
-            // inherits from AST_Statement; however, an AST_Function
-            // isn't really a statement.  This could byte in other
-            // places too. :-( Wish JS had multiple inheritance.
             throw def;
         });
         function ev(node, compressor) {
@@ -1180,7 +1183,9 @@ merge(Compressor.prototype, {
                 for (var i = 0, len = this.properties.length; i < len; i++) {
                     var prop = this.properties[i];
                     var key = prop.key;
-                    if (key instanceof AST_Node) {
+                    if (key instanceof AST_Symbol) {
+                        key = key.name;
+                    } else if (key instanceof AST_Node) {
                         key = ev(key, compressor);
                     }
                     if (typeof Object.prototype[key] === 'function') {
@@ -1258,7 +1263,7 @@ merge(Compressor.prototype, {
             this._evaluating = true;
             try {
                 var d = this.definition();
-                if (compressor.option("reduce_vars") && !d.modified && d.init) {
+                if (compressor.option("reduce_vars") && d.fixed && d.init) {
                     if (compressor.option("unsafe")) {
                         if (d.init._evaluated === undefined) {
                             d.init._evaluated = ev(d.init, compressor);
@@ -2189,7 +2194,7 @@ merge(Compressor.prototype, {
             // here because they are only used in an equality comparison later on.
             self.condition = negated;
             var tmp = self.body;
-            self.body = self.alternative || make_node(AST_EmptyStatement);
+            self.body = self.alternative || make_node(AST_EmptyStatement, self);
             self.alternative = tmp;
         }
         if (is_empty(self.body) && is_empty(self.alternative)) {
@@ -2454,7 +2459,7 @@ merge(Compressor.prototype, {
                   case "Boolean":
                     if (self.args.length == 0) return make_node(AST_False, self);
                     if (self.args.length == 1) return make_node(AST_UnaryPrefix, self, {
-                        expression: make_node(AST_UnaryPrefix, null, {
+                        expression: make_node(AST_UnaryPrefix, self, {
                             expression: self.args[0],
                             operator: "!"
                         }),
@@ -2850,7 +2855,7 @@ merge(Compressor.prototype, {
                 compressor.warn("Boolean && always false [{file}:{line},{col}]", self.start);
                 return make_node(AST_Seq, self, {
                     car: self.left,
-                    cdr: make_node(AST_False)
+                    cdr: make_node(AST_False, self)
                 }).optimize(compressor);
             }
             if (ll.length > 1 && ll[1]) {
@@ -3041,7 +3046,7 @@ merge(Compressor.prototype, {
         }
         if (compressor.option("evaluate") && compressor.option("reduce_vars")) {
             var d = self.definition();
-            if (!d.modified && d.init) {
+            if (d.fixed && d.init) {
                 if (d.should_replace === undefined) {
                     var init = d.init.evaluate(compressor);
                     if (init.length > 1) {

lib/utils.js

@@ -185,7 +185,7 @@ function push_uniq(array, el) {
 
 function string_template(text, props) {
     return text.replace(/\{(.+?)\}/g, function(str, p){
-        return props[p];
+        return props && props[p];
     });
 };
 

package.json

@@ -4,7 +4,7 @@
   "homepage": "http://lisperator.net/uglifyjs",
   "author": "Mihai Bazon <mihai.bazon@gmail.com> (http://lisperator.net/)",
   "license": "BSD-2-Clause",
-  "version": "2.8.1",
+  "version": "2.8.3",
   "engines": {
     "node": ">=0.8.0"
   },

test/compress/evaluate.js

@@ -337,6 +337,32 @@ unsafe_object_repeated: {
     }
 }
 
+unsafe_object_accessor: {
+    options = {
+        evaluate: true,
+        reduce_vars: true,
+        unsafe: true,
+    }
+    input: {
+        function f() {
+            var a = {
+                get b() {},
+                set b() {}
+            };
+            return {a:a};
+        }
+    }
+    expect: {
+        function f() {
+            var a = {
+                get b() {},
+                set b() {}
+            };
+            return {a:a};
+        }
+    }
+}
+
 unsafe_function: {
     options = {
         evaluate  : true,

test/mocha/minify.js

@@ -182,4 +182,13 @@ describe("minify", function() {
         });
     });
 
+    describe("Compressor", function() {
+        it("should be backward compatible with ast.transform(compressor)", function() {
+            var ast = Uglify.parse("function f(a){for(var i=0;i<a;i++)console.log(i)}");
+            ast.figure_out_scope();
+            ast = ast.transform(Uglify.Compressor());
+            assert.strictEqual(ast.print_to_string(), "function f(a){for(var i=0;i<a;i++)console.log(i)}");
+        });
+    })
+
 });