stylus/lib/nodes/feature.js

Robust, expressive, and feature-rich CSS superset

/*!
 * Stylus - Feature
 * Copyright (c) Automattic <developer.wordpress.com>
 * MIT Licensed
 */

/**
 * Module dependencies.
 */

var Node = require('./node');

module.exports = class Feature extends Node {
  /**
   * Initialize a new `Feature` with the given `segs`.
   *
   * @param {Array} segs
   * @api public
   */

  constructor(segs) {
    super();
    this.segments = segs;
    this.expr = null;
  }

  /**
   * Return a clone of this node.
   * 
   * @return {Node}
   * @api public
   */

  clone(parent) {
    var clone = new Feature;
    clone.segments = this.segments.map(function (node) { return node.clone(parent, clone); });
    if (this.expr) clone.expr = this.expr.clone(parent, clone);
    if (this.name) clone.name = this.name;
    clone.lineno = this.lineno;
    clone.column = this.column;
    clone.filename = this.filename;
    return clone;
  };

  /**
   * Return "<ident>" or "(<ident>: <expr>)"
   *
   * @return {String}
   * @api public
   */

  toString() {
    if (this.expr) {
      return '(' + this.segments.join('') + ': ' + this.expr.toString() + ')';
    } else {
      return this.segments.join('');
    }
  };

  /**
   * Return a JSON representation of this node.
   *
   * @return {Object}
   * @api public
   */

  toJSON() {
    var json = {
      __type: 'Feature',
      segments: this.segments,
      lineno: this.lineno,
      column: this.column,
      filename: this.filename
    };
    if (this.expr) json.expr = this.expr;
    if (this.name) json.name = this.name;
    return json;
  };
};