Add support for AssemblyIf (#90)

Author: Franco Victorio

src/printer.js

@@ -515,6 +515,13 @@ function genericPrint(path, options, print) {
         ':=',
         path.call(print, 'expression')
       ]);
+    case 'AssemblyIf':
+      return concat([
+        'if ',
+        path.call(print, 'condition'),
+        ' ',
+        path.call(print, 'body')
+      ]);
     case 'FunctionTypeName': {
       const returns = returnTypes => {
         if (returnTypes.length > 0) {

tests/Assembly/Assembly.sol

@@ -0,0 +1,10 @@
+contract Assembly {
+  function ifAssembly() {
+    assembly {
+      if
+        returndatasize    {
+          success := 0
+      }
+    }
+  }
+}

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

@@ -0,0 +1,25 @@
+// Jest Snapshot v1, https://goo.gl/fbAQLP
+
+exports[`Assembly.sol 1`] = `
+contract Assembly {
+  function ifAssembly() {
+    assembly {
+      if
+        returndatasize    {
+          success := 0
+      }
+    }
+  }
+}
+~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+contract Assembly {
+  function ifAssembly() {
+    assembly {
+      if returndatasize {
+        success := 0
+      }
+    }
+  }
+}
+
+`;

tests/Assembly/jsfmt.spec.js

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