JSX pragma revert (#6195)

* Removed the deprecated jsx pragma detection code and the concerned tests that included jsx-pragma

* Removed extra tests

* Restored packages/babel-plugin-transform-react-jsx/test/fixtures/react/honor-custom-jsx-pragma-option/

* Added JSX_ANNOTATION_REGEX

* Reverted the tests for jsx-pragma-options and removed those which throw deprecated message

packages/babel-plugin-transform-react-jsx/src/index.js

@@ -2,6 +2,8 @@ import jsx from "babel-plugin-syntax-jsx";
 import helper from "babel-helper-builder-react-jsx";
 
 export default function({ types: t }) {
+  const JSX_ANNOTATION_REGEX = /\*?\s*@jsx\s+([^\s]+)/;
+
   const visitor = helper({
     pre(state) {
       const tagName = state.tagName;
@@ -19,7 +21,16 @@ export default function({ types: t }) {
   });
 
   visitor.Program = function(path, state) {
-    const id = state.opts.pragma || "React.createElement";
+    const { file } = state;
+    let id = state.opts.pragma || "React.createElement";
+
+    for (const comment of (file.ast.comments: Array<Object>)) {
+      const matches = JSX_ANNOTATION_REGEX.exec(comment.value);
+      if (matches) {
+        id = matches[1];
+        break;
+      }
+    }
 
     state.set("jsxIdentifier", () =>
       id

packages/babel-plugin-transform-react-jsx/test/fixtures/react/honor-custom-jsx-comment-if-jsx-pragma-option-set/actual.js

@@ -0,0 +1,8 @@
+/** @jsx dom */
+
+<Foo></Foo>;
+
+var profile = <div>
+  <img src="avatar.png" className="profile" />
+  <h3>{[user.firstName, user.lastName].join(" ")}</h3>
+</div>;

packages/babel-plugin-transform-react-jsx/test/fixtures/react/honor-custom-jsx-comment-if-jsx-pragma-option-set/expected.js

@@ -0,0 +1,6 @@
+/** @jsx dom */
+dom(Foo, null);
+var profile = dom("div", null, dom("img", {
+  src: "avatar.png",
+  className: "profile"
+}), dom("h3", null, [user.firstName, user.lastName].join(" ")));

packages/babel-plugin-transform-react-jsx/test/fixtures/react/honor-custom-jsx-comment-if-jsx-pragma-option-set/options.json

@@ -0,0 +1,5 @@
+{
+   "plugins": [
+		["transform-react-jsx", {"pragma": "foo.bar"}]
+   ]
+}

packages/babel-plugin-transform-react-jsx/test/fixtures/react/honor-custom-jsx-comment/actual.js

@@ -0,0 +1,8 @@
+/** @jsx dom */
+
+<Foo></Foo>;
+
+var profile = <div>
+  <img src="avatar.png" className="profile" />
+  <h3>{[user.firstName, user.lastName].join(" ")}</h3>
+</div>;

packages/babel-plugin-transform-react-jsx/test/fixtures/react/honor-custom-jsx-comment/expected.js

@@ -0,0 +1,6 @@
+/** @jsx dom */
+dom(Foo, null);
+var profile = dom("div", null, dom("img", {
+  src: "avatar.png",
+  className: "profile"
+}), dom("h3", null, [user.firstName, user.lastName].join(" ")));