var Walker = /*#__PURE__*/function () {
  function Walker(order) {
    this.order = order;
    this.stack = [];
  }

  var _proto = Walker.prototype;

  _proto.visit = function visit(node, callback) {
    if (!node) {
      return;
    }

    this.stack.push(node);

    if (this.order === 'post') {
      this.children(node, callback);
      callback(node, this);
    } else {
      callback(node, this);
      this.children(node, callback);
    }

    this.stack.pop();
  };

  _proto.children = function children(node, callback) {
    switch (node.type) {
      case 'Block':
      case 'Template':
        return visitors.Program(this, node, callback);

      case 'ElementNode':
        return visitors.ElementNode(this, node, callback);

      case 'BlockStatement':
        return visitors.BlockStatement(this, node, callback);

      default:
        return;
    }
  };

  return Walker;
}();

export { Walker as default };
var visitors = {
  Program: function Program(walker, node, callback) {
    for (var i = 0; i < node.body.length; i++) {
      walker.visit(node.body[i], callback);
    }
  },
  Template: function Template(walker, node, callback) {
    for (var i = 0; i < node.body.length; i++) {
      walker.visit(node.body[i], callback);
    }
  },
  Block: function Block(walker, node, callback) {
    for (var i = 0; i < node.body.length; i++) {
      walker.visit(node.body[i], callback);
    }
  },
  ElementNode: function ElementNode(walker, node, callback) {
    for (var i = 0; i < node.children.length; i++) {
      walker.visit(node.children[i], callback);
    }
  },
  BlockStatement: function BlockStatement(walker, node, callback) {
    walker.visit(node.program, callback);
    walker.visit(node.inverse || null, callback);
  }
};
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