Optimize unmodified variables

1 files changed, 171 insertions, 0 deletions

diff --git a/test/compress/reduce_vars.js b/test/compress/reduce_vars.js
new file mode 100644
index 00000000..a1d05012
--- /dev/null
+++ b/test/compress/reduce_vars.js
@@ -0,0 +1,171 @@
+reduce_vars: {
+    options = {
+        conditionals  : true,
+        evaluate      : true,
+        global_defs   : {
+            C : 0
+        },
+        reduce_vars   : true,
+        unused        : true
+    }
+    input: {
+        var A = 1;
+        (function f0() {
+            var a = 2;
+            console.log(a - 5);
+            console.log(A - 5);
+        })();
+        (function f1() {
+            var a = 2;
+            console.log(a - 5);
+            eval("console.log(a);");
+        })();
+        (function f2(eval) {
+            var a = 2;
+            console.log(a - 5);
+            eval("console.log(a);");
+        })(eval);
+        (function f3() {
+            var b = typeof C !== "undefined";
+            var c = 4;
+            if (b) {
+                return 'yes';
+            } else {
+                return 'no';
+            }
+        })();
+        console.log(A + 1);
+    }
+    expect: {
+        var A = 1;
+        (function() {
+            console.log(-3);
+            console.log(-4);
+        })();
+        (function f1() {
+            var a = 2;
+            console.log(-3);
+            eval("console.log(a);");
+        })();
+        (function f2(eval) {
+            var a = 2;
+            console.log(-3);
+            eval("console.log(a);");
+        })(eval);
+        (function() {
+            return "yes";
+        })();
+        console.log(2);
+    }
+}
+
+modified: {
+    options = {
+        conditionals  : true,
+        evaluate      : true,
+        reduce_vars   : true,
+        unused        : true
+    }
+    input: {
+        function f0() {
+            var a = 1, b = 2;
+            b++;
+            console.log(a + 1);
+            console.log(b + 1);
+        }
+
+        function f1() {
+            var a = 1, b = 2;
+            --b;
+            console.log(a + 1);
+            console.log(b + 1);
+        }
+
+        function f2() {
+            var a = 1, b = 2, c = 3;
+            b = c;
+            console.log(a + b);
+            console.log(b + c);
+            console.log(a + c);
+            console.log(a + b + c);
+        }
+
+        function f3() {
+            var a = 1, b = 2, c = 3;
+            b *= c;
+            console.log(a + b);
+            console.log(b + c);
+            console.log(a + c);
+            console.log(a + b + c);
+        }
+
+        function f4() {
+            var a = 1, b = 2, c = 3;
+            if (a) {
+                b = c;
+            } else {
+                c = b;
+            }
+            console.log(a + b);
+            console.log(b + c);
+            // TODO: as "modified" is determined in "figure_out_scope",
+            // even "passes" wouldn't improve this any further
+            console.log(a + c);
+            console.log(a + b + c);
+        }
+
+        function f5(a) {
+            B = a;
+            console.log(A ? 'yes' : 'no');
+            console.log(B ? 'yes' : 'no');
+        }
+    }
+    expect: {
+        function f0() {
+            var b = 2;
+            b++;
+            console.log(2);
+            console.log(b + 1);
+        }
+
+        function f1() {
+            var b = 2;
+            --b;
+            console.log(2);
+            console.log(b + 1);
+        }
+
+        function f2() {
+            var a = 1, b = 2, c = 3;
+            b = c;
+            console.log(a + b);
+            console.log(b + c);
+            console.log(4);
+            console.log(a + b + c);
+        }
+
+        function f3() {
+            var a = 1, b = 2, c = 3;
+            b *= c;
+            console.log(a + b);
+            console.log(b + c);
+            console.log(4);
+            console.log(a + b + c);
+        }
+
+        function f4() {
+            var a = 1, b = 2, c = 3;
+            b = c;
+            console.log(a + b);
+            console.log(b + c);
+            console.log(a + c);
+            console.log(a + b + c);
+        }
+
+        function f5(a) {
+            B = a;
+            console.log(A ? 'yes' : 'no');
+            console.log(B ? 'yes' : 'no');
+        }
+   }
+}
\ No newline at end of file