Preserve constant keyword in variable declarations (#48)

* Preserve constant keyword in variable declarations

* Fix formatting issues

* Use  wrap VariableDeclaration case in a block

* remove no-case-declarations from eslint rules

* Update snapshot

src/printer.js

@@ -273,21 +273,28 @@ function genericPrint(path, options, print) {
         hardline,
         '}'
       ]);
-    case 'VariableDeclaration':
+    case 'VariableDeclaration': {
       if (!node.typeName) {
         return node.name;
       }
       doc = path.call(print, 'typeName');
       if (node.isIndexed) {
         doc = join(' ', [doc, 'indexed']);
       }
+      const constantKeyword = node.isDeclaredConst ? 'constant' : '';
       if (node.visibility === 'default') {
-        return join(' ', [doc, node.name]);
+        return join(
+          ' ',
+          [doc, constantKeyword, node.name].filter(element => element)
+        );
       }
       return join(
         ' ',
-        [doc, node.visibility, node.name].filter(element => element)
+        [doc, node.visibility, constantKeyword, node.name].filter(
+          element => element
+        )
       );
+    }
     case 'ArrayTypeName':
       return concat([
         path.call(print, 'baseTypeName'),

tests/SampleCrowdsale/SampleCrowdsale.sol

@@ -0,0 +1,48 @@
+pragma solidity ^0.4.18;
+
+import "../crowdsale/CappedCrowdsale.sol";
+import "../crowdsale/RefundableCrowdsale.sol";
+import "../token/MintableToken.sol";
+
+/**
+ * @title SampleCrowdsaleToken
+ * @dev Very simple ERC20 Token that can be minted.
+ * It is meant to be used in a crowdsale contract.
+ */
+contract SampleCrowdsaleToken is MintableToken {
+
+  string public constant name = "Sample Crowdsale Token";
+  string public constant symbol = "SCT";
+  uint8 public constant decimals = 18;
+
+}
+
+/**
+ * @title SampleCrowdsale
+ * @dev This is an example of a fully fledged crowdsale.
+ * The way to add new features to a base crowdsale is by multiple inheritance.
+ * In this example we are providing following extensions:
+ * CappedCrowdsale - sets a max boundary for raised funds
+ * RefundableCrowdsale - set a min goal to be reached and returns funds if it's not met
+ *
+ * After adding multiple features it's good practice to run integration tests
+ * to ensure that subcontracts works together as intended.
+ */
+contract SampleCrowdsale is CappedCrowdsale, RefundableCrowdsale {
+
+  function SampleCrowdsale(uint256 _startTime, uint256 _endTime, uint256 _rate, uint256 _goal, uint256 _cap, address _wallet) public
+    CappedCrowdsale(_cap)
+    FinalizableCrowdsale()
+    RefundableCrowdsale(_goal)
+    Crowdsale(_startTime, _endTime, _rate, _wallet)
+  {
+    //As goal needs to be met for a successful crowdsale
+    //the value needs to less or equal than a cap which is limit for accepted funds
+    require(_goal <= _cap);
+  }
+
+  function createTokenContract() internal returns (MintableToken) {
+    return new SampleCrowdsaleToken();
+  }
+
+}

tests/SampleCrowdsale/__snapshots__/jsfmt.spec.js.snap

@@ -0,0 +1,103 @@
+// Jest Snapshot v1, https://goo.gl/fbAQLP
+
+exports[`SampleCrowdsale.sol 1`] = `
+pragma solidity ^0.4.18;
+
+import "../crowdsale/CappedCrowdsale.sol";
+import "../crowdsale/RefundableCrowdsale.sol";
+import "../token/MintableToken.sol";
+
+/**
+ * @title SampleCrowdsaleToken
+ * @dev Very simple ERC20 Token that can be minted.
+ * It is meant to be used in a crowdsale contract.
+ */
+contract SampleCrowdsaleToken is MintableToken {
+
+  string public constant name = "Sample Crowdsale Token";
+  string public constant symbol = "SCT";
+  uint8 public constant decimals = 18;
+
+}
+
+/**
+ * @title SampleCrowdsale
+ * @dev This is an example of a fully fledged crowdsale.
+ * The way to add new features to a base crowdsale is by multiple inheritance.
+ * In this example we are providing following extensions:
+ * CappedCrowdsale - sets a max boundary for raised funds
+ * RefundableCrowdsale - set a min goal to be reached and returns funds if it's not met
+ *
+ * After adding multiple features it's good practice to run integration tests
+ * to ensure that subcontracts works together as intended.
+ */
+contract SampleCrowdsale is CappedCrowdsale, RefundableCrowdsale {
+
+  function SampleCrowdsale(uint256 _startTime, uint256 _endTime, uint256 _rate, uint256 _goal, uint256 _cap, address _wallet) public
+    CappedCrowdsale(_cap)
+    FinalizableCrowdsale()
+    RefundableCrowdsale(_goal)
+    Crowdsale(_startTime, _endTime, _rate, _wallet)
+  {
+    //As goal needs to be met for a successful crowdsale
+    //the value needs to less or equal than a cap which is limit for accepted funds
+    require(_goal <= _cap);
+  }
+
+  function createTokenContract() internal returns (MintableToken) {
+    return new SampleCrowdsaleToken();
+  }
+
+}
+~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+pragma solidity ^0.4.18;
+
+import "../crowdsale/CappedCrowdsale.sol";
+import "../crowdsale/RefundableCrowdsale.sol";
+import "../token/MintableToken.sol";
+
+/**
+ * @title SampleCrowdsaleToken
+ * @dev Very simple ERC20 Token that can be minted.
+ * It is meant to be used in a crowdsale contract.
+ */
+contract SampleCrowdsaleToken is MintableToken {
+  string public constant name = "Sample Crowdsale Token";
+  string public constant symbol = "SCT";
+  uint8 public constant decimals = 18;
+
+}
+
+
+/**
+ * @title SampleCrowdsale
+ * @dev This is an example of a fully fledged crowdsale.
+ * The way to add new features to a base crowdsale is by multiple inheritance.
+ * In this example we are providing following extensions:
+ * CappedCrowdsale - sets a max boundary for raised funds
+ * RefundableCrowdsale - set a min goal to be reached and returns funds if it's not met
+ *
+ * After adding multiple features it's good practice to run integration tests
+ * to ensure that subcontracts works together as intended.
+ */
+contract SampleCrowdsale is CappedCrowdsale, RefundableCrowdsale {
+  function SampleCrowdsale(
+    uint256 _startTime,
+    uint256 _endTime,
+    uint256 _rate,
+    uint256 _goal,
+    uint256 _cap,
+    address _wallet
+  ) public CappedCrowdsale(_cap) FinalizableCrowdsale RefundableCrowdsale(_goal) Crowdsale(_startTime, _endTime, _rate, _wallet) {
+    //As goal needs to be met for a successful crowdsale
+    //the value needs to less or equal than a cap which is limit for accepted funds
+    require(_goal <= _cap);
+  }
+
+  function createTokenContract() internal returns(MintableToken) {
+    return new SampleCrowdsaleToken();
+  }
+
+}
+
+`;

tests/SampleCrowdsale/jsfmt.spec.js

@@ -0,0 +1 @@
+run_spec(__dirname);