text: /**
   * @fileoverview Utility functions for React pragma configuration
   * @author Yannick Croissant
   */
  
  'use strict';
  
  const JSX_ANNOTATION_REGEX = /^\*\s*@jsx\s+([^\s]+)/;
  // Does not check for reserved keywords or unicode characters
  const JS_IDENTIFIER_REGEX = /^[_$a-zA-Z][_$a-zA-Z0-9]*$/;
  
  
  function getCreateClassFromContext(context) {
    let pragma = 'createReactClass';
    // .eslintrc shared settings (http://eslint.org/docs/user-guide/configuring#adding-shared-settings)
    if (context.settings.react && context.settings.react.createClass) {
      pragma = context.settings.react.createClass;
    }
    if (!JS_IDENTIFIER_REGEX.test(pragma)) {
      throw new Error(`createClass pragma ${pragma} is not a valid function name`);
    }
    return pragma;
  }
  
  function getFragmentFromContext(context) {
    let pragma = 'Fragment';
    // .eslintrc shared settings (http://eslint.org/docs/user-guide/configuring#adding-shared-settings)
    if (context.settings.react && context.settings.react.fragment) {
      pragma = context.settings.react.fragment;
    }
    if (!JS_IDENTIFIER_REGEX.test(pragma)) {
      throw new Error(`Fragment pragma ${pragma} is not a valid identifier`);
    }
    return pragma;
  }
  
  function getFromContext(context) {
    let pragma = 'React';
  
    const sourceCode = context.getSourceCode();
    const pragmaNode = sourceCode.getAllComments().find(node => JSX_ANNOTATION_REGEX.test(node.value));
  
    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)
    } else if (context.settings.react && context.settings.react.pragma) {
      pragma = context.settings.react.pragma;
    }
  
    if (!JS_IDENTIFIER_REGEX.test(pragma)) {
      throw new Error(`React pragma ${pragma} is not a valid identifier`);
    }
    return pragma;
  }
  
  module.exports = {
    getCreateClassFromContext,
    getFragmentFromContext,
    getFromContext
  };
  