@coffeelint/cli/lib/rules/no_trailing_whitespace.js

Lint your CoffeeScript

(function() {
  var NoTrailingWhitespace, regexes;

  regexes = {
    trailingWhitespace: /[^\s]+[\t ]+\r?$/,
    onlySpaces: /^[\t ]+\r?$/,
    spacesStart: /[\t ]+\r?$/,
    lineHasComment: /^\s*[^\#]*\#/
  };

  module.exports = NoTrailingWhitespace = (function() {
    class NoTrailingWhitespace {
      lintLine(line, lineApi) {
        var i, len, ref, ref1, ref2, str, token, tokens;
        if (!((ref = lineApi.config['no_trailing_whitespace']) != null ? ref.allowed_in_empty_lines : void 0)) {
          if (regexes.onlySpaces.test(line)) {
            return {
              columnNumber: line.match(regexes.spacesStart).length + 1
            };
          }
        }
        if (regexes.trailingWhitespace.test(line)) {
          // By default only the regex above is needed.
          if (!((ref1 = lineApi.config['no_trailing_whitespace']) != null ? ref1.allowed_in_comments : void 0)) {
            return {
              columnNumber: line.match(regexes.spacesStart).index + 1
            };
          }
          line = line;
          tokens = lineApi.tokensByLine[lineApi.lineNumber];
          if (!tokens) {
            return null;
          }
          ref2 = (function() {
            var j, len, results;
            results = [];
            for (j = 0, len = tokens.length; j < len; j++) {
              token = tokens[j];
              if (token[0] === 'STRING') {
                results.push(token[1]);
              }
            }
            return results;
          })();
          // To avoid confusion when a string might contain a "#", every string
          // on this line will be removed. before checking for a comment
          for (i = 0, len = ref2.length; i < len; i++) {
            str = ref2[i];
            line = line.replace(str, 'STRING');
          }
          if (!regexes.lineHasComment.test(line)) {
            return {
              columnNumber: line.match(regexes.spacesStart).index + 1
            };
          }
        }
      }

    };

    NoTrailingWhitespace.prototype.rule = {
      type: 'style',
      name: 'no_trailing_whitespace',
      level: 'error',
      message: 'Line ends with trailing whitespace',
      allowed_in_comments: false,
      allowed_in_empty_lines: true,
      description: `This rule forbids trailing whitespace in your code, since it is
needless cruft. It is enabled by default.`
    };

    return NoTrailingWhitespace;

  }).call(this);

}).call(this);