Put comma after any non-comments, non-whitespace in JSXEspression

Fixes #1673
Closes #3129

vendor/fbtransform/transforms/__tests__/react-test.js

@@ -324,6 +324,19 @@ describe('react jsx', function() {
     expect(transform(code).code).toBe(result);
   });
 
+  it('handles overparenthesized JS', function() {
+    var code =
+    '<foo a={(b)} c={(d)}>Foo {(e+f //A line comment\n' +
+        '/* A multiline comment */)\n' +
+      '} bar\n' +
+    '</foo>';
+    var result = 'React.createElement("foo", {a: (b), c: (d)}, "Foo ", (e+f //A line comment\n' +
+            '/* A multiline comment */), \n' +
+    '" bar"\n' +
+    ')';
+    expect(transform(code).code).toBe(result);
+  });
+
   it('should transform known hyphenated tags', function() {
     var code = '<font-face />;';
     var result = 'React.createElement("font-face", null);';

vendor/fbtransform/transforms/jsx.js

@@ -11,6 +11,33 @@
 var Syntax = require('jstransform').Syntax;
 var utils = require('jstransform/src/utils');
 
+function commaAfterLastParen(value) {
+  var state = 'normal';
+  var commaPos = 0;
+  for (var i = 0; i < value.length; ++i) {
+    if (state === 'normal') {
+      if (value.substr(i, 2) === '//') {
+        state = 'singleline';
+        i += 1;
+      } else if (value.substr(i, 2) === '/*') {
+        state = 'multiline';
+        i += 1;
+      } else if (value.charAt(i).trim() !== '') {
+        commaPos = i + 1;
+      }
+    } else if (state === 'singleline' && value.charAt(i) === '\n') {
+      state = 'normal';
+    } else if (state === 'multiline' &&
+        value.charAt(i) === '*' &&
+        i + 1 < value.length &&
+        value.charAt(i + 1) === '/') {
+      i += 1;
+      state = 'normal';
+    }
+  }
+  return value.substring(0, commaPos) + ', ' + trimLeft(value.substring(commaPos));
+}
+
 function renderJSXLiteral(object, isLast, state, start, end) {
   var lines = object.value.split(/\r\n|\n|\r/);
 
@@ -84,11 +111,11 @@ function renderJSXExpressionContainer(traverse, object, isLast, path, state) {
   if (!isLast && object.expression.type !== Syntax.JSXEmptyExpression) {
     // If we need to append a comma, make sure to do so after the expression.
     utils.catchup(object.expression.range[1], state, trimLeft);
-    utils.append(', ', state);
+    utils.catchup(object.range[1] - 1, state, commaAfterLastParen);
+  } else {
+    // Minus 1 to skip `}`.
+    utils.catchup(object.range[1] - 1, state, trimLeft);
   }
-
-  // Minus 1 to skip `}`.
-  utils.catchup(object.range[1] - 1, state, trimLeft);
   utils.move(object.range[1], state);
   return false;
 }