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/**
 * @fileOverview Any non-ASCII characters in lib/ will increase the size
 *               of the compiled node binary. This linter rule ensures that
 *               any such character is reported.
 * @author Sarat Addepalli <sarat.addepalli@gmail.com>
 */

'use strict';

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

const nonAsciiRegexPattern = /[^\r\n\x20-\x7e]/;
const suggestions = {
  '’': '\'',
  '‛': '\'',
  '‘': '\'',
  '“': '"',
  '‟': '"',
  '”': '"',
  '«': '"',
  '»': '"',
  '—': '-',
};

module.exports = (context) => {

  const reportIfError = (node, sourceCode) => {

    const matches = sourceCode.text.match(nonAsciiRegexPattern);

    if (!matches) return;

    const offendingCharacter = matches[0];
    const offendingCharacterPosition = matches.index;
    const suggestion = suggestions[offendingCharacter];

    let message = `Non-ASCII character '${offendingCharacter}' detected.`;

    message = suggestion ?
      `${message} Consider replacing with: ${suggestion}` :
      message;

    context.report({
      node,
      message,
      loc: sourceCode.getLocFromIndex(offendingCharacterPosition),
    });
  };

  return {
    Program: (node) => reportIfError(node, context.getSourceCode()),
  };
};

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