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var promises = require("../promises");
var sax = require("sax");
var _ = require("underscore");
var nodes = require("./nodes");
var Element = nodes.Element;
exports.readString = readString;
function readString(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(nodes.text(text));
}
};
parser.onend = function() {
if (!finished) {
finished = true;
deferred.resolve(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(value, key, input);
result[mappedKey] = valueFunc(value, key, input);
return result;
}, {});
}
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