enhance side_effects (#3384)

lib/compress.js

@@ -4172,10 +4172,8 @@ merge(Compressor.prototype, {
             var right = this.right.drop_side_effect_free(compressor, first_in_statement);
             if (!right) return this.left.drop_side_effect_free(compressor, first_in_statement);
             if (lazy_op[this.operator]) {
-                var node;
-                if (right === this.right) {
-                    node = this;
-                } else {
+                var node = this;
+                if (right !== node.right) {
                     node = this.clone();
                     node.right = right.drop_side_effect_free(compressor);
                 }
@@ -4559,14 +4557,14 @@ merge(Compressor.prototype, {
                     operator : "||",
                     left     : negated,
                     right    : self.body.body
-                })
+                }).transform(compressor)
             }).optimize(compressor);
             return make_node(AST_SimpleStatement, self, {
                 body: make_node(AST_Binary, self, {
                     operator : "&&",
                     left     : self.condition,
                     right    : self.body.body
-                })
+                }).transform(compressor)
             }).optimize(compressor);
         }
         if (self.body instanceof AST_EmptyStatement
@@ -4576,7 +4574,7 @@ merge(Compressor.prototype, {
                     operator : "||",
                     left     : self.condition,
                     right    : self.alternative.body
-                })
+                }).transform(compressor)
             }).optimize(compressor);
         }
         if (self.body instanceof AST_Exit

test/compress/conditionals.js

@@ -1435,3 +1435,39 @@ iife_condition: {
     }
     expect_stdout: "PASS"
 }
+
+angularjs_chain: {
+    options = {
+        conditionals: true,
+        passes: 2,
+        side_effects: true,
+    }
+    input: {
+        function nonComputedMember(left, right, context, create) {
+            var lhs = left();
+            if (create && create !== 1) {
+                if (lhs && lhs[right] == null) {
+                    lhs[right] = {};
+                }
+            }
+            var value = lhs != null ? lhs[right] : undefined;
+            if (context) {
+                return { context: lhs, name: right, value: value };
+            } else {
+                return value;
+            }
+        }
+    }
+    expect: {
+        function nonComputedMember(left, right, context, create) {
+            var lhs = left();
+            create && 1 !== create && lhs && null == lhs[right] && (lhs[right] = {});
+            var value = null != lhs ? lhs[right] : void 0;
+            return context ? {
+                context: lhs,
+                name: right,
+                value: value
+            } : value;
+        }
+    }
+}

test/compress/sequences.js

@@ -964,3 +964,39 @@ missing_link: {
         console.log(a);
     }
 }
+
+angularjs_chain: {
+    options = {
+        conditionals: true,
+        sequences: true,
+        side_effects: true,
+    }
+    input: {
+        function nonComputedMember(left, right, context, create) {
+            var lhs = left();
+            if (create && create !== 1) {
+                if (lhs && lhs[right] == null) {
+                    lhs[right] = {};
+                }
+            }
+            var value = lhs != null ? lhs[right] : undefined;
+            if (context) {
+                return { context: lhs, name: right, value: value };
+            } else {
+                return value;
+            }
+        }
+    }
+    expect: {
+        function nonComputedMember(left, right, context, create) {
+            var lhs = left();
+            create && 1 !== create && lhs && null == lhs[right] && (lhs[right] = {});
+            var value = null != lhs ? lhs[right] : void 0;
+            return context ? {
+                context: lhs,
+                name: right,
+                value: value
+            } : value;
+        }
+    }
+}