/**
 * @fileoverview Rule to check for ambiguous div operator in regexes
 * @author Matt DuVall <http://www.mattduvall.com>
 */

'use strict';

//------------------------------------------------------------------------------
// Rule Definition
//------------------------------------------------------------------------------

/** @type {import('../types').Rule.RuleModule} */
module.exports = {
  meta: {
    type: 'suggestion',

    docs: {
      description:
        'Disallow equal signs explicitly at the beginning of regular expressions',
      recommended: false,
      frozen: true,
      url: 'https://eslint.org/docs/latest/rules/no-div-regex',
    },

    fixable: 'code',

    schema: [],

    messages: {
      unexpected: "A regular expression literal can be confused with '/='.",
    },
  },

  create(context) {
    const sourceCode = context.sourceCode;

    return {
      Literal(node) {
        const token = sourceCode.getFirstToken(node);

        if (token.type === 'RegularExpression' && token.value[1] === '=') {
          context.report({
            node,
            messageId: 'unexpected',
            fix(fixer) {
              return fixer.replaceTextRange(
                [token.range[0] + 1, token.range[0] + 2],
                '[=]'
              );
            },
          });
        }
      },
    };
  },
};