From fd531de123084be6bd76a6474d5091679562e1c6 Mon Sep 17 00:00:00 2001
From: Esteban Ordano <eordano@gmail.com>
Date: Tue, 9 Dec 2014 17:30:52 -0300
Subject: [PATCH] Update opcode and script transactions

---
 lib/opcode.js |  5 +++++
 lib/script.js | 36 ++++++++++++++++++++++++++++++------
 2 files changed, 35 insertions(+), 6 deletions(-)

diff --git a/lib/opcode.js b/lib/opcode.js
index 75e8120..80af9f9 100644
--- a/lib/opcode.js
+++ b/lib/opcode.js
@@ -1,5 +1,7 @@
 'use strict';
 
+var _ = require('lodash');
+
 function Opcode(num) {
   if (!(this instanceof Opcode)) {
     return new Opcode(num);
@@ -203,6 +205,9 @@ for (var k in Opcode.map) {
   }
 }
 
+// Easier access to opcodes
+_.extend(Opcode, Opcode.map);
+
 /**
  * @returns true if opcode is one of OP_0, OP_1, ..., OP_16
  */
diff --git a/lib/script.js b/lib/script.js
index df418f2..ed45d86 100644
--- a/lib/script.js
+++ b/lib/script.js
@@ -1,11 +1,16 @@
 'use strict';
 
+var _ = require('lodash');
+var bu = require('./util/buffer');
+
+var Address = require('./address');
 var BufferReader = require('./encoding/bufferreader');
 var BufferWriter = require('./encoding/bufferwriter');
+var Errors = require('./errors');
+var Hash = require('./crypto/hash');
 var Opcode = require('./opcode');
 var PublicKey = require('./publickey');
-var Hash = require('./crypto/hash');
-var bu = require('./util/buffer');
+var PublicKey = require('./publickey');
 
 /**
  * A bitcoin transaction script. Each transaction's inputs and outputs
@@ -25,6 +30,8 @@ var Script = function Script(from) {
 
   if (bu.isBuffer(from)) {
     return Script.fromBuffer(from);
+  } else if (from instanceof Script) {
+    return Script.fromBuffer(from.toBuffer());
   } else if (typeof from === 'string') {
     return Script.fromString(from);
   } else if (typeof from !== 'undefined') {
@@ -182,8 +189,6 @@ Script.prototype.toString = function() {
   return str.substr(0, str.length - 1);
 };
 
-
-
 // script classification methods
 
 /**
@@ -341,6 +346,7 @@ Script.prototype.classify = function() {
  * @returns true if script is one of the known types
  */
 Script.prototype.isStandard = function() {
+  // TODO: Add BIP62 compliance
   return this.classify() !== Script.types.UNKNOWN;
 };
 
@@ -430,6 +436,16 @@ Script.prototype._addBuffer = function(buf, prepend) {
   return this;
 };
 
+Script.prototype.removeCodeseparators = function() {
+  var chunks = [];
+  for (var i = 0; i < this.chunks.length; i++) {
+    if (this.chunks[i] !== Opcode.map.OP_CODESEPARATOR) {
+      chunks.push(this.chunks[i]);
+    }
+  }
+  this.chunks = chunks;
+  return this;
+};
 
 // high level script builder methods
 
@@ -459,6 +475,8 @@ Script.buildMultisigOut = function(pubkeys, m) {
 Script.buildPublicKeyHashOut = function(to) {
   if (to instanceof PublicKey) {
     to = to.toAddress();
+  } else if (_.isString(to)) {
+    to = new Address(to);
   }
   var s = new Script();
   s.add(Opcode('OP_DUP'))
@@ -495,8 +513,8 @@ Script.buildDataOut = function(data) {
 };
 
 /**
- * @returns a new pay to script hash script for given script
  * @param {Script} script - the redeemScript for the new p2sh output 
+ * @returns Script new pay to script hash script for given script
  */
 Script.buildScriptHashOut = function(script) {
   var s = new Script();
@@ -506,9 +524,15 @@ Script.buildScriptHashOut = function(script) {
   return s;
 };
 
+/**
+ * @returns Script an empty script
+ */
+Script.empty = function() {
+  return new Script();
+};
 
 /**
- * @returns a new pay to script hash script that pays to this script
+ * @returns Script a new pay to script hash script that pays to this script
  */
 Script.prototype.toScriptHashOut = function() {
   return Script.buildScriptHashOut(this);