jade/lib/nodes/block.js

Jade template engine

/*!
 * Jade - nodes - Block
 * Copyright(c) 2010 TJ Holowaychuk <tj@vision-media.ca>
 * MIT Licensed
 */

/**
 * Module dependencies.
 */

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

/**
 * Initialize a new `Block` with an optional `node`.
 *
 * @param {Node} node
 * @api public
 */

var Block = module.exports = function Block(node){
  this.nodes = [];
  if (node) this.push(node);
};

/**
 * Inherit from `Node`.
 */

Block.prototype.__proto__ = Node.prototype;

/**
 * Replace the nodes in `other` with the nodes
 * in `this` block.
 *
 * @param {Block} other
 * @api private
 */

Block.prototype.replace = function(other){
  other.nodes = this.nodes;
};

/**
 * Pust the given `node`.
 *
 * @param {Node} node
 * @return {Number}
 * @api public
 */

Block.prototype.push = function(node){
  return this.nodes.push(node);
};

/**
 * Check if this block is empty.
 *
 * @return {Boolean}
 * @api public
 */

Block.prototype.isEmpty = function(){
  return 0 == this.nodes.length;
};

/**
 * Unshift the given `node`.
 *
 * @param {Node} node
 * @return {Number}
 * @api public
 */

Block.prototype.unshift = function(node){
  return this.nodes.unshift(node);
};

/**
 * Return the "last" block.
 *
 * @return {Block}
 * @api private
 */

Block.prototype.lastBlock = function(){
  var last = this
    , node;
  for (var i = 0, len = this.nodes.length; i < len; ++i) {
    node = this.nodes[i];
    if (node.nodes) last = node.lastBlock();
    else if (node.block && !node.block.isEmpty()) last = node.block.lastBlock();
  }
  return last;
};