Refactor duplicate code to do with branches

lib/instrumenter.js

@@ -186,7 +186,7 @@ instrumenter.instrumentFunctionDeclaration = function instrumentFunctionDeclarat
   }
 };
 
-instrumenter.instrumentAssertOrRequire = function instrumentAssertOrRequire(contract, expression){
+instrumenter.addNewBranch = function addNewBranch(contract, expression) {
   contract.branchId += 1;
   const startline = (contract.instrumented.slice(0, expression.start).match(/\n/g) || []).length + 1;
   const startcol = expression.start - contract.instrumented.slice(0, expression.start).lastIndexOf('\n') - 1;
@@ -210,38 +210,20 @@ instrumenter.instrumentAssertOrRequire = function instrumentAssertOrRequire(cont
       },
     }],
   };
+};
+
+instrumenter.instrumentAssertOrRequire = function instrumentAssertOrRequire(contract, expression) {
+  instrumenter.addNewBranch(contract, expression);
   createOrAppendInjectionPoint(contract, expression.start, {
     type: 'callAssertPreEvent', branchId: contract.branchId,
   });
   createOrAppendInjectionPoint(contract, expression.end + 1, {
     type: 'callAssertPostEvent', branchId: contract.branchId,
   });
-}
+};
 
 instrumenter.instrumentIfStatement = function instrumentIfStatement(contract, expression) {
-  contract.branchId += 1;
-  const startline = (contract.instrumented.slice(0, expression.start).match(/\n/g) || []).length + 1;
-  const startcol = expression.start - contract.instrumented.slice(0, expression.start).lastIndexOf('\n') - 1;
-  // NB locations for if branches in istanbul are zero length and associated with the start of the if.
-  contract.branchMap[contract.branchId] = {
-    line: startline,
-    type: 'if',
-    locations: [{
-      start: {
-        line: startline, column: startcol,
-      },
-      end: {
-        line: startline, column: startcol,
-      },
-    }, {
-      start: {
-        line: startline, column: startcol,
-      },
-      end: {
-        line: startline, column: startcol,
-      },
-    }],
-  };
+  instrumenter.addNewBranch(contract, expression);
   if (expression.consequent.type === 'BlockStatement') {
     createOrAppendInjectionPoint(contract, expression.consequent.start + 1, {
       type: 'callBranchEvent', branchId: contract.branchId, locationIdx: 0,