coins: refactor method names. add isUnspent.

lib/coins/coinview.js

@@ -186,7 +186,7 @@ CoinView.prototype.addOutput = function addOutput(prevout, output) {
  * @returns {CoinEntry|null}
  */
 
-CoinView.prototype.spendOutput = function spendOutput(prevout) {
+CoinView.prototype.spendEntry = function spendEntry(prevout) {
   let {hash, index} = prevout;
   let coins = this.get(hash);
   let coin;
@@ -210,7 +210,7 @@ CoinView.prototype.spendOutput = function spendOutput(prevout) {
  * @returns {CoinEntry|null}
  */
 
-CoinView.prototype.removeOutput = function removeOutput(prevout) {
+CoinView.prototype.removeEntry = function removeEntry(prevout) {
   let {hash, index} = prevout;
   let coins = this.get(hash);
 
@@ -252,6 +252,22 @@ CoinView.prototype.getEntry = function getEntry(prevout) {
   return coins.get(index);
 };
 
+/**
+ * Test whether an entry has been spent by prevout.
+ * @param {Outpoint} prevout
+ * @returns {Boolean}
+ */
+
+CoinView.prototype.isUnspent = function isUnspent(prevout) {
+  let {hash, index} = prevout;
+  let coins = this.get(hash);
+
+  if (!coins)
+    return false;
+
+  return coins.isUnspent(index);
+};
+
 /**
  * Get a single coin by prevout.
  * @param {Outpoint} prevout
@@ -333,6 +349,16 @@ CoinView.prototype.getEntryFor = function getEntryFor(input) {
   return this.getEntry(input.prevout);
 };
 
+/**
+ * Test whether an entry has been spent by input.
+ * @param {Input} input
+ * @returns {Boolean}
+ */
+
+CoinView.prototype.isUnspentFor = function isUnspentFor(input) {
+  return this.isUnspent(input.prevout);
+};
+
 /**
  * Get a single coin by input.
  * @param {Input} input

test/coins-test.js

@@ -68,7 +68,7 @@ describe('Coins', function() {
     assert(coins);
     length = coins.outputs.size;
 
-    view.spendOutput(new Outpoint(hash, 0));
+    view.spendEntry(new Outpoint(hash, 0));
 
     coins = view.get(hash);
     assert(coins);