text: /**
   * @fileoverview Disallow undeclared variables in JSX
   * @author Yannick Croissant
   */
  
  'use strict';
  
  const docsUrl = require('../util/docsUrl');
  const jsxUtil = require('../util/jsx');
  
  // ------------------------------------------------------------------------------
  // Rule Definition
  // ------------------------------------------------------------------------------
  
  module.exports = {
    meta: {
      docs: {
        description: 'Disallow undeclared variables in JSX',
        category: 'Possible Errors',
        recommended: true,
        url: docsUrl('jsx-no-undef')
      },
  
      messages: {
        undefined: '\'{{identifier}}\' is not defined.'
      },
  
      schema: [{
        type: 'object',
        properties: {
          allowGlobals: {
            type: 'boolean'
          }
        },
        additionalProperties: false
      }]
    },
  
    create(context) {
      const config = context.options[0] || {};
      const allowGlobals = config.allowGlobals || false;
  
      /**
       * Compare an identifier with the variables declared in the scope
       * @param {ASTNode} node - Identifier or JSXIdentifier node
       * @returns {void}
       */
      function checkIdentifierInJSX(node) {
        let scope = context.getScope();
        const sourceCode = context.getSourceCode();
        const sourceType = sourceCode.ast.sourceType;
        const scopeUpperBound = !allowGlobals && sourceType === 'module' ? 'module' : 'global';
        let variables = scope.variables;
        let i;
        let len;
  
        // Ignore 'this' keyword (also maked as JSXIdentifier when used in JSX)
        if (node.name === 'this') {
          return;
        }
  
        while (scope.type !== scopeUpperBound && scope.type !== 'global') {
          scope = scope.upper;
          variables = scope.variables.concat(variables);
        }
        if (scope.childScopes.length) {
          variables = scope.childScopes[0].variables.concat(variables);
          // Temporary fix for babel-eslint
          if (scope.childScopes[0].childScopes.length) {
            variables = scope.childScopes[0].childScopes[0].variables.concat(variables);
          }
        }
  
        for (i = 0, len = variables.length; i < len; i++) {
          if (variables[i].name === node.name) {
            return;
          }
        }
  
        context.report({
          node,
          messageId: 'undefined',
          data: {
            identifier: node.name
          }
        });
      }
  
      return {
        JSXOpeningElement(node) {
          switch (node.name.type) {
            case 'JSXIdentifier':
              if (jsxUtil.isDOMComponent(node)) {
                return;
              }
              node = node.name;
              break;
            case 'JSXMemberExpression':
              node = node.name;
              do {
                node = node.object;
              } while (node && node.type !== 'JSXIdentifier');
              break;
            case 'JSXNamespacedName':
              return;
            default:
              break;
          }
          checkIdentifierInJSX(node);
        }
      };
    }
  };
  