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var promises = require("./promises");
var sax = require("sax");
var _ = require("underscore");
exports.read = read;
exports.Element = Element;
function read(xmlString, namespaceMap) {
namespaceMap = namespaceMap || {};
var finished = false;
var parser = sax.parser(true, {xmlns: true, position: false});
var rootElement = {children: []};
var currentElement = rootElement;
var stack = [];
var deferred = promises.defer();
parser.onopentag = function(node) {
var attributes = mapObject(node.attributes, function(attribute) {
return attribute.value;
}, mapName);
var element = new Element(mapName(node), attributes);
currentElement.children.push(element);
stack.push(currentElement);
currentElement = element;
};
function mapName(node) {
if (node.uri) {
var mappedPrefix = namespaceMap[node.uri];
var prefix;
if (mappedPrefix) {
prefix = mappedPrefix;
} else {
prefix = "{" + node.uri + "}";
}
return prefix + ":" + node.local;
} else {
return node.local;
}
}
parser.onclosetag = function(node) {
currentElement = stack.pop();
};
parser.ontext = function(text) {
if (currentElement !== rootElement) {
currentElement.children.push({
type: "text",
value: text
});
}
};
parser.onend = function() {
if (!finished) {
finished = true;
deferred.resolve({
root: rootElement.children[0]
});
}
};
parser.onerror = function(error) {
if (!finished) {
finished = true;
deferred.reject(error);
}
};
parser.write(xmlString).close();
return deferred.promise;
}
function mapObject(input, valueFunc, keyFunc) {
return _.reduce(input, function(result, value, key) {
var mappedKey = keyFunc.call(null, value, key, input);
result[mappedKey] = valueFunc.call(null, value, key, input);
return result;
}, {});
}
var emptyElement = {
first: function() {
return null;
},
firstOrEmpty: function() {
return emptyElement;
},
attributes: {}
};
function Element(name, attributes, children) {
this.type = "element";
this.name = name;
this.attributes = attributes || {};
this.children = children || [];
}
Element.prototype.first = function(name) {
return _.find(this.children, function(child) {
return child.name == name;
});
};
Element.prototype.firstOrEmpty = function(name) {
return this.first(name) || emptyElement;
};
Element.prototype.getElementsByTagName = function(name) {
var elements = _.filter(this.children, function(child) {
return child.name == name;
});
return toElementList(elements);
};
Element.prototype.text = function() {
if (this.children.length === 0) {
return "";
} else if (this.children.length !== 1 || this.children[0].type !== "text") {
throw new Error("Not implemented");
}
return this.children[0].value;
};
var elementListPrototype = {
getElementsByTagName: function(name) {
return toElementList(_.flatten(this.map(function(element) {
return element.getElementsByTagName(name);
}, true)));
}
};
function toElementList(array) {
return _.extend(array, elementListPrototype);
}
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