docs: function StylesHelper(ops, attrs) {
  		attrs = attrs || {};
  		this.amsu = new angularMultiSelectUtils();
  		_extends(this, this.amsu.sanitize_ops(ops));
  
  		this.START_REPLACE_SYMBOL_REGEX = /<\[/g;
  		this.END_REPLACE_SYMBOL_REGEX = /\]>/g;
  		this.START_INTERPOLATE_SYMBOL = $interpolate.startSymbol();
  		this.END_INTERPOLATE_SYMBOL = $interpolate.endSymbol();
  
  		this.START_REPLACE_SYMBOL_ALTERNATIVE_REGEX = /<#/g;
  		this.END_REPLACE_SYMBOL_ALTERNATIVE_REGEX = /#>/g;
  		this.START_INTERPOLATE_SYMBOL_ALTERNATIVE = $interpolate.startSymbol();
  		this.END_INTERPOLATE_SYMBOL_ALTERNATIVE = $interpolate.endSymbol();
  
  		this.START_REPLACE_SYMBOL_ALTERNATIVE2_REGEX = /<\(/g;
  		this.END_REPLACE_SYMBOL_ALTERNATIVE2_REGEX = /\)>/g;
  		this.START_INTERPOLATE_SYMBOL_ALTERNATIVE2 = $interpolate.startSymbol();
  		this.END_INTERPOLATE_SYMBOL_ALTERNATIVE2 = $interpolate.endSymbol();
  
  		this.START_REPLACE_SYMBOL_ALTERNATIVE_REPETITIVE_REGEX = /<#/g;
  		this.END_REPLACE_SYMBOL_ALTERNATIVE_REPETITIVE_REGEX = /#>/g;
  		this.START_INTERPOLATE_SYMBOL_ALTERNATIVE_REPETITIVE = '<[' + $interpolate.startSymbol();
  		this.END_INTERPOLATE_SYMBOL_ALTERNATIVE_REPETITIVE = $interpolate.endSymbol() + ']>';
  
  		/*
     * String representation of nodes/leafs and dropdown label.
     */
  		this.dropdown_repr_attr = attrs.dropdownLabel || "";
  		this.dropdown_repr = this.interpolate_alternative(this.dropdown_repr_attr)({ angularMultiSelectConstants: angularMultiSelectConstants });
  		this.dropdown_repr = this.interpolate(this.dropdown_repr);
  
  		this.node_repr_attr = attrs.nodeLabel || "";
  		this.node_repr = this.interpolate_alternative_repetitive(this.node_repr_attr)({ angularMultiSelectConstants: angularMultiSelectConstants });
  		this.node_repr = this.interpolate(this.node_repr);
  
  		this.leaf_repr_attr = attrs.leafLabel || "";
  		this.leaf_repr = this.interpolate_alternative_repetitive(this.leaf_repr_attr)({ angularMultiSelectConstants: angularMultiSelectConstants });
  		this.leaf_repr = this.interpolate(this.leaf_repr);
  	}