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

Lint your CoffeeScript

(function() {
  var NoNestedStringInterpolation;

  module.exports = NoNestedStringInterpolation = (function() {
    class NoNestedStringInterpolation {
      constructor() {
        this.blocks = [];
      }

      lintToken(token, tokenApi) {
        var block, ref, tag, tagname, tagtype;
        [tag] = token;
        if (!this.blocks.length) {
          this.blocks.push([]);
        }
        block = this.blocks[this.blocks.length - 1];
        if (tag === 'JSX_TAG') {
          this.blocks.push([]);
          return;
        }
        [tagname, tagtype] = tag.split('_');
        if (tagtype === 'END') {
          block.pop();
          if (tagname === 'STRING') {
            block.strCount -= 1;
            if (block.strCount <= 1) {
              block.error = false;
            }
          } else {
            this.blocks.pop();
          }
          if (!block.length) {
            this.blocks.pop();
          }
          if (!this.blocks.length) {
            this.blocks.push([]);
          }
        } else {
          block.push(tagname);
          if (tagname === 'STRING') {
            block.strCount = ((ref = block.strCount) != null ? ref : 0) + 1;
            // Don't make multiple errors for deeply nested interpolation
            if (block.strCount > 1 && !block.error) {
              block.error = true;
              return {token};
            }
          }
        }
      }

    };

    NoNestedStringInterpolation.prototype.rule = {
      type: 'problem',
      name: 'no_nested_string_interpolation',
      level: 'warn',
      message: 'Nested string interpolation is forbidden',
      description: `This rule warns about nested string interpolation,
as it tends to make code harder to read and understand.
<pre>
<code># Good!
str = "Book by #{firstName.toUpperCase()} #{lastName.toUpperCase()}"

# Bad!
str = "Book by #{"#{firstName} #{lastName}".toUpperCase()}"
</code>
</pre>`
    };

    NoNestedStringInterpolation.prototype.tokens = ['JSX_TAG', 'CALL_START', 'CALL_END', 'STRING_START', 'STRING_END'];

    return NoNestedStringInterpolation;

  }).call(this);

}).call(this);