[patch] relax JSX pragma regexp

Fixes #2642.

Author: gfmio

Diff for: lib/util/pragma.js

@@ -5,7 +5,7 @@
 
 'use strict';
 
-const JSX_ANNOTATION_REGEX = /^\*\s*@jsx\s+([^\s]+)/;
+const JSX_ANNOTATION_REGEX = /@jsx\s+([^\s]+)/;
 // Does not check for reserved keywords or unicode characters
 const JS_IDENTIFIER_REGEX = /^[_$a-zA-Z][_$a-zA-Z0-9]*$/;
 
@@ -42,7 +42,7 @@ function getFromContext(context) {
   if (pragmaNode) {
     const matches = JSX_ANNOTATION_REGEX.exec(pragmaNode.value);
     pragma = matches[1].split('.')[0];
-  // .eslintrc shared settings (http://eslint.org/docs/user-guide/configuring#adding-shared-settings)
+    // .eslintrc shared settings (http://eslint.org/docs/user-guide/configuring#adding-shared-settings)
   } else if (context.settings.react && context.settings.react.pragma) {
     pragma = context.settings.react.pragma;
   }

Diff for: package.json

@@ -51,6 +51,7 @@
     "eslint-config-airbnb-base": "^14.2.0",
     "eslint-plugin-eslint-plugin": "^2.2.2",
     "eslint-plugin-import": "^2.21.2",
+    "espree": "^3.5.4",
     "istanbul": "^0.4.5",
     "markdown-magic": "^1.0.0",
     "mocha": "^5.2.0",

Diff for: tests/util/pragma.js

@@ -0,0 +1,64 @@
+'use strict';
+
+const assert = require('assert');
+const SourceCode = require('eslint').SourceCode;
+const espree = require('espree');
+
+const getFromContext = require('../../lib/util/pragma').getFromContext;
+
+const DEFAULT_CONFIG = {
+  ecmaVersion: 6,
+  comment: true,
+  tokens: true,
+  range: true,
+  loc: true
+};
+
+const DEFAULT_SETTINGS = {
+  react: {
+    pragma: 'React'
+  }
+};
+
+const fakeContext = (code) => {
+  const ast = espree.parse(code, DEFAULT_CONFIG);
+  return {
+    getSourceCode: () => new SourceCode(code, ast),
+    settings: DEFAULT_SETTINGS
+  };
+};
+
+describe('pragma', () => {
+  describe('getFromContext', () => {
+    it('finds the pragma in a block comment', () => {
+      const code = '/* @jsx jsx */';
+      assert.strictEqual(getFromContext(fakeContext(code)), 'jsx');
+    });
+
+    it('finds the pragma in a docstring comment', () => {
+      const code = '/** @jsx jsx */';
+      assert.strictEqual(getFromContext(fakeContext(code)), 'jsx');
+    });
+
+    it('finds the pragma in a line comment', () => {
+      const code = '// @jsx jsx';
+      assert.strictEqual(
+        getFromContext(fakeContext(code)),
+        'jsx'
+      );
+    });
+
+    it('defaults to the value of settings.react.pragma', () => {
+      const code = '';
+      assert.strictEqual(
+        getFromContext(fakeContext(code)),
+        DEFAULT_SETTINGS.react.pragma
+      );
+    });
+
+    it('throws an error if the pragma is invalid', () => {
+      const code = '/* @jsx invalid-jsx-pragma */';
+      assert.throws(() => getFromContext(fakeContext(code)));
+    });
+  });
+});