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function TreeBuilder(element_factory) {
this._data = [];
this._elem = [];
this._last = null;
this._tail = null;
if (!element_factory) {
/* evil circular dep */
element_factory = require('./elementtree').Element;
}
this._factory = element_factory;
}
TreeBuilder.prototype.close = function() {
return this._last;
};
TreeBuilder.prototype._flush = function() {
if (this._data) {
if (this._last !== null) {
var text = this._data.join("");
if (this._tail) {
this._last.tail = text;
}
else {
this._last.text = text;
}
}
this._data = [];
}
};
TreeBuilder.prototype.data = function(data) {
this._data.push(data);
};
TreeBuilder.prototype.start = function(tag, attrs) {
this._flush();
var elem = this._factory(tag, attrs);
this._last = elem;
if (this._elem.length) {
this._elem[this._elem.length - 1].append(elem);
}
this._elem.push(elem);
this._tail = null;
};
TreeBuilder.prototype.end = function(tag) {
this._flush();
this._last = this._elem.pop();
if (this._last.tag !== tag) {
throw new Error("end tag mismatch");
}
this._tail = 1;
return this._last;
};
exports.TreeBuilder = TreeBuilder;
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