Rename events to past-tense (#1181)

CODE_STYLE.md

@@ -18,8 +18,21 @@ Any exception or additions specific to our project are documented below.
 
 * Parameters must be prefixed with an underscore.
 
-```
-function test(uint256 _testParameter1, uint256 _testParameter2) {
+    ```
+    function test(uint256 _testParameter1, uint256 _testParameter2) {
     ...
-}
-```
+    }
+    ```
+
+* Events should be emitted immediately after the state change that they
+  represent, and consequently they should be named in past tense.
+
+    ```
+    function _burn(address _who, uint256 _value) internal {
+      super._burn(_who, _value);
+      emit TokensBurned(_who, _value);
+    }
+    ```
+
+  Some standards (e.g. ERC20) use present tense, and in those cases the
+  standard specification prevails.

contracts/crowdsale/Crowdsale.sol

@@ -43,7 +43,7 @@ contract Crowdsale {
    * @param value weis paid for purchase
    * @param amount amount of tokens purchased
    */
-  event TokenPurchase(
+  event TokensPurchased(
     address indexed purchaser,
     address indexed beneficiary,
     uint256 value,
@@ -92,7 +92,7 @@ contract Crowdsale {
     weiRaised = weiRaised.add(weiAmount);
 
     _processPurchase(_beneficiary, tokens);
-    emit TokenPurchase(
+    emit TokensPurchased(
       msg.sender,
       _beneficiary,
       weiAmount,
@@ -111,7 +111,7 @@ contract Crowdsale {
 
   /**
    * @dev Validation of an incoming purchase. Use require statements to revert state when conditions are not met. Use `super` in contracts that inherit from Crowdsale to extend their validations.
-   * Example from CappedCrowdsale.sol's _preValidatePurchase method: 
+   * Example from CappedCrowdsale.sol's _preValidatePurchase method:
    *   super._preValidatePurchase(_beneficiary, _weiAmount);
    *   require(weiRaised.add(_weiAmount) <= cap);
    * @param _beneficiary Address performing the token purchase

contracts/crowdsale/distribution/FinalizableCrowdsale.sol

@@ -15,7 +15,7 @@ contract FinalizableCrowdsale is Ownable, TimedCrowdsale {
 
   bool public isFinalized = false;
 
-  event Finalized();
+  event CrowdsaleFinalized();
 
   /**
    * @dev Must be called after crowdsale ends, to do some extra finalization
@@ -26,7 +26,7 @@ contract FinalizableCrowdsale is Ownable, TimedCrowdsale {
     require(hasClosed());
 
     finalization();
-    emit Finalized();
+    emit CrowdsaleFinalized();
 
     isFinalized = true;
   }

contracts/lifecycle/Pausable.sol

@@ -9,8 +9,8 @@ import "../ownership/Ownable.sol";
  * @dev Base contract which allows children to implement an emergency stop mechanism.
  */
 contract Pausable is Ownable {
-  event Pause();
-  event Unpause();
+  event Paused();
+  event Unpaused();
 
   bool public paused = false;
 
@@ -36,7 +36,7 @@ contract Pausable is Ownable {
    */
   function pause() public onlyOwner whenNotPaused {
     paused = true;
-    emit Pause();
+    emit Paused();
   }
 
   /**
@@ -44,6 +44,6 @@ contract Pausable is Ownable {
    */
   function unpause() public onlyOwner whenPaused {
     paused = false;
-    emit Unpause();
+    emit Unpaused();
   }
 }

contracts/token/ERC20/BurnableToken.sol

@@ -9,7 +9,7 @@ import "./StandardToken.sol";
  */
 contract BurnableToken is StandardToken {
 
-  event Burn(address indexed burner, uint256 value);
+  event TokensBurned(address indexed burner, uint256 value);
 
   /**
    * @dev Burns a specific amount of tokens.
@@ -34,6 +34,6 @@ contract BurnableToken is StandardToken {
    */
   function _burn(address _who, uint256 _value) internal {
     super._burn(_who, _value);
-    emit Burn(_who, _value);
+    emit TokensBurned(_who, _value);
   }
 }

test/crowdsale/AllowanceCrowdsale.test.js

@@ -37,7 +37,7 @@ contract('AllowanceCrowdsale', function ([_, investor, wallet, purchaser, tokenW
   describe('high-level purchase', function () {
     it('should log purchase', async function () {
       const { logs } = await this.crowdsale.sendTransaction({ value: value, from: investor });
-      const event = logs.find(e => e.event === 'TokenPurchase');
+      const event = logs.find(e => e.event === 'TokensPurchased');
       should.exist(event);
       event.args.purchaser.should.equal(investor);
       event.args.beneficiary.should.equal(investor);

test/crowdsale/Crowdsale.test.js

@@ -82,7 +82,7 @@ contract('Crowdsale', function ([_, investor, wallet, purchaser]) {
       describe('high-level purchase', function () {
         it('should log purchase', async function () {
           const { logs } = await this.crowdsale.sendTransaction({ value: value, from: investor });
-          const event = logs.find(e => e.event === 'TokenPurchase');
+          const event = logs.find(e => e.event === 'TokensPurchased');
           should.exist(event);
           event.args.purchaser.should.equal(investor);
           event.args.beneficiary.should.equal(investor);
@@ -106,7 +106,7 @@ contract('Crowdsale', function ([_, investor, wallet, purchaser]) {
       describe('low-level purchase', function () {
         it('should log purchase', async function () {
           const { logs } = await this.crowdsale.buyTokens(investor, { value: value, from: purchaser });
-          const event = logs.find(e => e.event === 'TokenPurchase');
+          const event = logs.find(e => e.event === 'TokensPurchased');
           should.exist(event);
           event.args.purchaser.should.equal(purchaser);
           event.args.beneficiary.should.equal(investor);

test/crowdsale/FinalizableCrowdsale.test.js

@@ -56,7 +56,7 @@ contract('FinalizableCrowdsale', function ([_, owner, wallet, thirdparty]) {
   it('logs finalized', async function () {
     await increaseTimeTo(this.afterClosingTime);
     const { logs } = await this.crowdsale.finalize({ from: owner });
-    const event = logs.find(e => e.event === 'Finalized');
+    const event = logs.find(e => e.event === 'CrowdsaleFinalized');
     should.exist(event);
   });
 });

test/crowdsale/MintedCrowdsale.behavior.js

@@ -20,7 +20,7 @@ function shouldBehaveLikeMintedCrowdsale ([_, investor, wallet, purchaser], rate
     describe('high-level purchase', function () {
       it('should log purchase', async function () {
         const { logs } = await this.crowdsale.sendTransaction({ value: value, from: investor });
-        const event = logs.find(e => e.event === 'TokenPurchase');
+        const event = logs.find(e => e.event === 'TokensPurchased');
         should.exist(event);
         event.args.purchaser.should.equal(investor);
         event.args.beneficiary.should.equal(investor);

test/lifecycle/Pausable.test.js

@@ -57,9 +57,9 @@ contract('Pausable', function () {
 
   it('should log Pause and Unpause events appropriately', async function () {
     const setPauseLogs = (await this.Pausable.pause()).logs;
-    expectEvent.inLogs(setPauseLogs, 'Pause');
+    expectEvent.inLogs(setPauseLogs, 'Paused');
 
     const setUnPauseLogs = (await this.Pausable.unpause()).logs;
-    expectEvent.inLogs(setUnPauseLogs, 'Unpause');
+    expectEvent.inLogs(setUnPauseLogs, 'Unpaused');
   });
 });

test/token/ERC20/BurnableToken.behavior.js

@@ -29,7 +29,7 @@ function shouldBehaveLikeBurnableToken (owner, initialBalance, [burner]) {
         });
 
         it('emits a burn event', async function () {
-          const event = expectEvent.inLogs(this.logs, 'Burn');
+          const event = expectEvent.inLogs(this.logs, 'TokensBurned');
           event.args.burner.should.equal(owner);
           event.args.value.should.be.bignumber.equal(amount);
         });
@@ -80,7 +80,7 @@ function shouldBehaveLikeBurnableToken (owner, initialBalance, [burner]) {
         });
 
         it('emits a burn event', async function () {
-          const event = expectEvent.inLogs(this.logs, 'Burn');
+          const event = expectEvent.inLogs(this.logs, 'TokensBurned');
           event.args.burner.should.equal(owner);
           event.args.value.should.be.bignumber.equal(amount);
         });

test/token/ERC20/PausableToken.test.js

@@ -20,7 +20,7 @@ contract('PausableToken', function ([_, owner, recipient, anotherAccount]) {
           const { logs } = await this.token.pause({ from });
 
           logs.length.should.equal(1);
-          logs[0].event.should.equal('Pause');
+          logs[0].event.should.equal('Paused');
         });
       });
 
@@ -62,7 +62,7 @@ contract('PausableToken', function ([_, owner, recipient, anotherAccount]) {
           const { logs } = await this.token.unpause({ from });
 
           logs.length.should.equal(1);
-          logs[0].event.should.equal('Unpause');
+          logs[0].event.should.equal('Unpaused');
         });
       });