stylus/lib/nodes/group.js

Robust, expressive, and feature-rich CSS superset

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

/**
 * Module dependencies.
 */

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

module.exports = class Group extends Node {
  /**
   * Initialize a new `Group`.
   *
   * @api public
   */

  constructor() {
    super();
    this.nodes = [];
    this.extends = [];
  }

  /**
   * Push the given `selector` node.
   *
   * @param {Selector} selector
   * @api public
   */

  push(selector) {
    this.nodes.push(selector);
  };

  /**
   * Return this set's `Block`.
   */

  get block() {
    return this.nodes[0].block;
  };

  /**
   * Assign `block` to each selector in this set.
   *
   * @param {Block} block
   * @api public
   */

  set block(block) {
    for (var i = 0, len = this.nodes.length; i < len; ++i) {
      this.nodes[i].block = block;
    }
  };

  /**
   * Check if this set has only placeholders.
   *
   * @return {Boolean}
   * @api public
   */

  get hasOnlyPlaceholders() {
    return this.nodes.every(function (selector) { return selector.isPlaceholder; });
  };

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

  clone(parent) {
    var clone = new Group;
    clone.lineno = this.lineno;
    clone.column = this.column;
    this.nodes.forEach(function (node) {
      clone.push(node.clone(parent, clone));
    });
    clone.filename = this.filename;
    clone.block = this.block.clone(parent, clone);
    return clone;
  };

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

  toJSON() {
    return {
      __type: 'Group',
      nodes: this.nodes,
      block: this.block,
      lineno: this.lineno,
      column: this.column,
      filename: this.filename
    };
  };
};