fix corner case in evaluate & unsafe (#5355)

fixes #5354

lib/compress.js

@@ -4389,9 +4389,6 @@ Compressor.prototype.compress = function(node) {
             "setUTCMonth",
             "setUTCSeconds",
             "setYear",
-            "toExponential",
-            "toFixed",
-            "toPrecision",
         ]);
         def(AST_Call, function(compressor) {
             if (!compressor.option("unsafe")) return false;
@@ -4442,7 +4439,10 @@ Compressor.prototype.compress = function(node) {
             "charAt",
             "substr",
             "substring",
+            "toExponential",
+            "toFixed",
             "toLowerCase",
+            "toPrecision",
             "toString",
             "toUpperCase",
             "trim",
@@ -10771,6 +10771,9 @@ Compressor.prototype.compress = function(node) {
             if (seq !== self) return seq.optimize(compressor);
         }
         switch (op) {
+          case "+":
+            if (compressor.option("evaluate") && exp.is_number(compressor)) return exp;
+            break;
           case "-":
             if (exp instanceof AST_Infinity) exp = exp.transform(compressor);
             // avoids infinite recursion of numerals
@@ -11477,19 +11480,17 @@ Compressor.prototype.compress = function(node) {
                     if (self.left.value == 0) {
                         if (self.right.is_boolean(compressor)) return make_node(AST_UnaryPrefix, self, {
                             operator: "+",
-                            expression: self.right
+                            expression: self.right,
                         }).optimize(compressor);
                         if (self.right.is_number(compressor) && !self.right.is_negative_zero()) return self.right;
                     }
                     break;
                   // 1 * n ---> n
                   case "*":
-                    if (self.left.value == 1) {
-                        return self.right.is_number(compressor) ? self.right : make_node(AST_UnaryPrefix, self, {
-                            operator: "+",
-                            expression: self.right
-                        }).optimize(compressor);
-                    }
+                    if (self.left.value == 1) return make_node(AST_UnaryPrefix, self, {
+                        operator: "+",
+                        expression: self.right,
+                    }).optimize(compressor);
                     break;
                 }
                 if (self.right instanceof AST_Number && !self.left.is_constant()) switch (self.operator) {
@@ -11498,28 +11499,24 @@ Compressor.prototype.compress = function(node) {
                     if (self.right.value == 0) {
                         if (self.left.is_boolean(compressor)) return make_node(AST_UnaryPrefix, self, {
                             operator: "+",
-                            expression: self.left
+                            expression: self.left,
                         }).optimize(compressor);
                         if (self.left.is_number(compressor) && !self.left.is_negative_zero()) return self.left;
                     }
                     break;
                   // n - 0 ---> n
                   case "-":
-                    if (self.right.value == 0) {
-                        return self.left.is_number(compressor) ? self.left : make_node(AST_UnaryPrefix, self, {
-                            operator: "+",
-                            expression: self.left
-                        }).optimize(compressor);
-                    }
+                    if (self.right.value == 0) return make_node(AST_UnaryPrefix, self, {
+                        operator: "+",
+                        expression: self.left,
+                    }).optimize(compressor);
                     break;
                   // n / 1 ---> n
                   case "/":
-                    if (self.right.value == 1) {
-                        return self.left.is_number(compressor) ? self.left : make_node(AST_UnaryPrefix, self, {
-                            operator: "+",
-                            expression: self.left
-                        }).optimize(compressor);
-                    }
+                    if (self.right.value == 1) return make_node(AST_UnaryPrefix, self, {
+                        operator: "+",
+                        expression: self.left,
+                    }).optimize(compressor);
                     break;
                 }
             }

test/compress/evaluate.js

@@ -745,7 +745,7 @@ call_args: {
     expect: {
         var a = 1;
         console.log(1);
-        +(1, 1);
+        1, 1;
     }
     expect_stdout: true
 }
@@ -769,7 +769,7 @@ call_args_drop_param: {
     }
     expect: {
         console.log(1);
-        +(b, 1);
+        b, 1;
     }
     expect_stdout: true
 }
@@ -3241,3 +3241,35 @@ issue_4886_2: {
     }
     expect_stdout: "true"
 }
+
+issue_5354: {
+    options = {
+        evaluate: true,
+        unsafe: true,
+    }
+    input: {
+        function f(a) {
+            return +a.toExponential(1);
+        }
+        function g(b) {
+            return 0 + b.toFixed(2);
+        }
+        function h(c) {
+            return 1 * c.toPrecision(3);
+        }
+        console.log(typeof f(45), typeof g(67), typeof h(89));
+    }
+    expect: {
+        function f(a) {
+            return +a.toExponential(1);
+        }
+        function g(b) {
+            return 0 + b.toFixed(2);
+        }
+        function h(c) {
+            return +c.toPrecision(3);
+        }
+        console.log(typeof f(45), typeof g(67), typeof h(89));
+    }
+    expect_stdout: "number string number"
+}

test/compress/numbers.js

@@ -842,9 +842,9 @@ unary_binary_parentheses: {
         v.forEach(function(x) {
             v.forEach(function(y) {
                 console.log(
-                    +x*y,
-                    +x/y,
-                    +x%y,
+                    x*y,
+                    x/y,
+                    x%y,
                     -x*y,
                     -x/y,
                     -x%y
@@ -1397,7 +1397,7 @@ issue_3695: {
     }
     expect: {
         var a = [];
-        console.log(+(a * (a[0] = false)));
+        console.log(a * (a[0] = false));
     }
     expect_stdout: "NaN"
 }