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(function(module, ns) {
var Responder = ns.require('responder');
if (typeof(window) === 'undefined') {
Parser.sax = require('sax');
} else {
Parser.sax = sax;
}
/**
* Creates a parser object.
*
* @param {Object} baseHandler base sax handler.
*/
function Parser(baseHandler) {
var handler;
var events = [
'ontext',
'oncdata',
'onopentag',
'onclosetag',
'onerror',
'onend'
];
if (typeof(baseHandler) !== 'undefined') {
handler = baseHandler;
} else {
handler = ns.require('sax/base');
}
this.stack = [];
this.handles = {};
this._handlerStack = [];
this.tagStack = [];
this.root = this.current = {};
this.setHandler(handler);
this._parse = Parser.sax.parser(true, {
xmlns: true,
trim: true,
normalize: false,
lowercase: true
});
events.forEach(function(event) {
this._parse[event] = this[event].bind(this);
}, this);
Responder.call(this);
}
Parser.prototype = {
__proto__: Responder.prototype,
/**
* Sets current handler, optionally adding
* previous one to the handlerStack.
*
* @param {Object} handler new handler.
* @param {Boolean} storeOriginal store old handler?
*/
setHandler: function(handler, storeOriginal) {
if (storeOriginal) {
this._handlerStack.push(this.handler);
}
this.handler = handler;
},
/**
* Sets handler to previous one in the stack.
*/
restoreHandler: function() {
if (this._handlerStack.length) {
this.handler = this._handlerStack.pop();
}
},
/**
* Registers a top level handler
*
* @param {String} tag xmlns uri/local tag name for example
* DAV:/a.
*
* @param {Object} handler new handler to use when tag is
* triggered.
*/
registerHandler: function(tag, handler) {
this.handles[tag] = handler;
},
/**
* Writes data into the parser.
*
* @param {String} chunk partial/complete chunk of xml.
*/
write: function(chunk) {
return this._parse.write(chunk);
},
close: function() {
this._parse.close();
},
get closed() {
return this._parse.closed;
},
/**
* Determines if given tagSpec has a specific handler.
*
* @param {String} tagSpec usual tag spec.
*/
getHandler: function(tagSpec) {
var handler;
var handlers = this.handler.handles;
if (!handlers) {
handlers = this.handles;
}
if (tagSpec in handlers) {
handler = handlers[tagSpec];
if (handler !== this.handler) {
return handler;
}
}
return false;
},
_fireHandler: function(event, data) {
if (typeof(this.handler[event]) === 'function') {
this.handler[event].call(this, data, this.handler);
}
},
onopentag: function(data) {
var handle;
var stackData = {
local: data.local,
name: data.name
};
//build tagSpec for others to use.
data.tagSpec = data.uri + '/' + data.local;
//add to stackData
stackData.tagSpec = data.tagSpec;
//determine if we need to switch to another
//handler object.
handle = this.getHandler(data.tagSpec);
if (handle) {
//switch to new handler object
this.setHandler(handle, true);
stackData.handler = handle;
}
this.tagStack.push(stackData);
this._fireHandler('onopentag', data);
},
//XXX: optimize later
get currentTag() {
return this.tagStack[this.tagStack.length - 1];
},
onclosetag: function(data) {
var stack, handler;
stack = this.currentTag;
if (stack.handler) {
//fire oncomplete handler if available
this._fireHandler('oncomplete');
}
//fire the onclosetag event
this._fireHandler('onclosetag', data);
if (stack.handler) {
//restore previous handler
this.restoreHandler();
}
//actually remove the stack tag
this.tagStack.pop();
},
ontext: function(data) {
this._fireHandler('ontext', data);
},
oncdata: function(data) {
this._fireHandler('oncdata', data);
},
onerror: function(data) {
//TODO: XXX implement handling of parsing errors.
//unlikely but possible if server goes down
//or there is some authentication issue that
//we miss.
this._fireHandler('onerror', data);
},
onend: function() {
this._fireHandler('onend', this.root);
}
};
module.exports = Parser;
}.apply(
this,
(this.Caldav) ?
[Caldav('sax'), Caldav] :
[module, require('./caldav')]
));
|
