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/*!
* Stylus - at-rule
* Copyright (c) Automattic <developer.wordpress.com>
* MIT Licensed
*/
/**
* Module dependencies.
*/
var Node = require('./node');
/**
* Initialize a new at-rule node.
*
* @param {String} type
* @api public
*/
var Atrule = module.exports = function Atrule(type){
Node.call(this);
this.type = type;
};
/**
* Inherit from `Node.prototype`.
*/
Atrule.prototype.__proto__ = Node.prototype;
/**
* Check if at-rule's block has only properties.
*
* @return {Boolean}
* @api public
*/
Atrule.prototype.__defineGetter__('hasOnlyProperties', function(){
if (!this.block) return false;
var nodes = this.block.nodes;
for (var i = 0, len = nodes.length; i < len; ++i) {
var nodeName = nodes[i].nodeName;
switch(nodes[i].nodeName) {
case 'property':
case 'expression':
case 'comment':
continue;
default:
return false;
}
}
return true;
});
/**
* Return a clone of this node.
*
* @return {Node}
* @api public
*/
Atrule.prototype.clone = function(parent){
var clone = new Atrule(this.type);
if (this.block) clone.block = this.block.clone(parent, clone);
clone.segments = this.segments.map(function(node){ return node.clone(parent, clone); });
clone.lineno = this.lineno;
clone.column = this.column;
clone.filename = this.filename;
return clone;
};
/**
* Return a JSON representation of this node.
*
* @return {Object}
* @api public
*/
Atrule.prototype.toJSON = function(){
var json = {
__type: 'Atrule',
type: this.type,
segments: this.segments,
lineno: this.lineno,
column: this.column,
filename: this.filename
};
if (this.block) json.block = this.block;
return json;
};
/**
* Return @<type>.
*
* @return {String}
* @api public
*/
Atrule.prototype.toString = function(){
return '@' + this.type;
};
/**
* Check if the at-rule's block has output nodes.
*
* @return {Boolean}
* @api public
*/
Atrule.prototype.__defineGetter__('hasOutput', function(){
return !!this.block && hasOutput(this.block);
});
function hasOutput(block) {
var nodes = block.nodes;
// only placeholder selectors
if (nodes.every(function(node){
return 'group' == node.nodeName && node.hasOnlyPlaceholders;
})) return false;
// something visible
return nodes.some(function(node) {
switch (node.nodeName) {
case 'property':
case 'literal':
case 'import':
return true;
case 'block':
return hasOutput(node);
default:
if (node.block) return hasOutput(node.block);
}
});
}