add script.isStandard()

lib/script.js

@@ -329,6 +329,15 @@ Script.prototype.classify = function() {
   return Script.types.UNKNOWN;
 };
 
+
+/**
+ * @returns true if script is one of the known types
+ */
+Script.prototype.isStandard = function() {
+  return this.classify() !== Script.types.UNKNOWN;
+};
+
+
 // Script construction methods
 
 /**

test/script.js

@@ -166,6 +166,11 @@ describe('Script', function() {
 
   describe('#toString', function() {
 
+    it('should work with an empty script', function() {
+      var script = new Script();
+      script.toString().should.equal('');
+    });
+
     it('should output this buffer an OP code, data, and another OP code', function() {
       var buf = new Buffer([0, 0, 0, 0, 0, 0, 1, 2, 3, 0]);
       buf[0] = Opcode('OP_0').toNumber();
@@ -361,4 +366,13 @@ describe('Script', function() {
     });
   });
 
+  describe('#isStandard', function() {
+    it('should classify correctly standard script', function() {
+      Script('OP_RETURN 1 0x00').isStandard().should.equal(true);
+    });
+    it('should classify correctly non standard script', function() {
+      Script('OP_TRUE OP_FALSE').isStandard().should.equal(false);
+    });
+  });
+
 });