121 lines
2.5 KiB
JavaScript
121 lines
2.5 KiB
JavaScript
//////////////////////////////////////////
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// Defines mappings between content-type
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// and the appropriate parsers.
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//////////////////////////////////////////
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var Transform = require('stream').Transform;
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var sax = require('sax');
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function parseXML(str, cb) {
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var obj, current, parser = sax.parser(true, { trim: true, lowercase: true })
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parser.onerror = parser.onend = done;
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function done(err) {
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parser.onerror = parser.onend = function() { }
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cb(err, obj)
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}
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function newElement(name, attributes) {
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return {
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name: name || '',
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value: '',
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attributes: attributes || {},
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children: []
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}
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}
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parser.oncdata = parser.ontext = function(t) {
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if (current) current.value += t
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}
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parser.onopentag = function(node) {
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var element = newElement(node.name, node.attributes)
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if (current) {
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element.parent = current
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current.children.push(element)
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} else { // root object
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obj = element
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}
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current = element
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};
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parser.onclosetag = function() {
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if (typeof current.parent !== 'undefined') {
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var just_closed = current
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current = current.parent
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delete just_closed.parent
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}
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}
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parser.write(str).close()
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}
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function parserFactory(name, fn) {
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function parser() {
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var chunks = [],
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stream = new Transform({ objectMode: true });
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// Buffer all our data
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stream._transform = function(chunk, encoding, done) {
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chunks.push(chunk);
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done();
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}
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// And call the parser when all is there.
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stream._flush = function(done) {
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var self = this,
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data = Buffer.concat(chunks);
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try {
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fn(data, function(err, result) {
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if (err) throw err;
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self.push(result);
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});
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} catch (err) {
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self.push(data); // just pass the original data
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} finally {
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done();
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}
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}
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return stream;
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}
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return { fn: parser, name: name };
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}
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var parsers = {}
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function buildParser(name, types, fn) {
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var parser = parserFactory(name, fn);
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types.forEach(function(type) {
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parsers[type] = parser;
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})
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}
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buildParser('json', [
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'application/json',
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'text/javascript'
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], function(buffer, cb) {
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var err, data;
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try { data = JSON.parse(buffer); } catch (e) { err = e; }
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cb(err, data);
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});
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buildParser('xml', [
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'text/xml',
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'application/xml',
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'application/rdf+xml',
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'application/rss+xml',
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'application/atom+xml'
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], function(buffer, cb) {
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parseXML(buffer.toString(), function(err, obj) {
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cb(err, obj)
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})
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});
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module.exports = parsers;
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module.exports.use = buildParser;
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