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# sax js A sax-style parser for XML and HTML. Designed with [node](http://nodejs.org/) in mind, but should work fine in the browser or other CommonJS implementations. ## What This Is * A very simple tool to parse through an XML string. * A stepping stone to a streaming HTML parser. * A handy way to deal with RSS and other mostly-ok-but-kinda-broken XML docs. ## What This Is (probably) Not * An HTML Parser - That's a fine goal, but this isn't it. It's just XML. * A DOM Builder - You can use it to build an object model out of XML, but it doesn't do that out of the box. * XSLT - No DOM = no querying. * 100% Compliant with (some other SAX implementation) - Most SAX implementations are in Java and do a lot more than this does. * An XML Validator - It does a little validation when in strict mode, but not much. * A Schema-Aware XSD Thing - Schemas are an exercise in fetishistic masochism. * A DTD-aware Thing - Fetching DTDs is a much bigger job. ## Regarding `<!DOCTYPE`s and `<!ENTITY`s The parser will handle the basic XML entities in text nodes and attribute values: `& < > ' "`. It's possible to define additional entities in XML by putting them in the DTD. This parser doesn't do anything with that. If you want to listen to the `ondoctype` event, and then fetch the doctypes, and read the entities and add them to `parser.ENTITIES`, then be my guest. Unknown entities will fail in strict mode, and in loose mode, will pass through unmolested. ## Usage ```javascript var sax = require("./lib/sax"), strict = true, // set to false for html-mode parser = sax.parser(strict); parser.onerror = function (e) { // an error happened. }; parser.ontext = function (t) { // got some text. t is the string of text. }; parser.onopentag = function (node) { // opened a tag. node has "name" and "attributes" }; parser.onattribute = function (attr) { // an attribute. attr has "name" and "value" }; parser.onend = function () { // parser stream is done, and ready to have more stuff written to it. }; parser.write('<xml>Hello, <who name="world">world</who>!</xml>').close(); // stream usage // takes the same options as the parser var saxStream = require("sax").createStream(strict, options) saxStream.on("error", function (e) { // unhandled errors will throw, since this is a proper node // event emitter. console.error("error!", e) // clear the error this._parser.error = null this._parser.resume() }) saxStream.on("opentag", function (node) { // same object as above }) // pipe is supported, and it's readable/writable // same chunks coming in also go out. fs.createReadStream("file.xml") .pipe(saxStream) .pipe(fs.createWriteStream("file-copy.xml")) ``` ## Arguments Pass the following arguments to the parser function. All are optional. `strict` - Boolean. Whether or not to be a jerk. Default: `false`. `opt` - Object bag of settings regarding string formatting. All default to `false`. Settings supported: * `trim` - Boolean. Whether or not to trim text and comment nodes. * `normalize` - Boolean. If true, then turn any whitespace into a single space. * `lowercase` - Boolean. If true, then lowercase tag names and attribute names in loose mode, rather than uppercasing them. * `xmlns` - Boolean. If true, then namespaces are supported. * `position` - Boolean. If false, then don't track line/col/position. * `strictEntities` - Boolean. If true, only parse [predefined XML entities](http://www.w3.org/TR/REC-xml/#sec-predefined-ent) (`&`, `'`, `>`, `<`, and `"`) ## Methods `write` - Write bytes onto the stream. You don't have to do this all at once. You can keep writing as much as you want. `close` - Close the stream. Once closed, no more data may be written until it is done processing the buffer, which is signaled by the `end` event. `resume` - To gracefully handle errors, assign a listener to the `error` event. Then, when the error is taken care of, you can call `resume` to continue parsing. Otherwise, the parser will not continue while in an error state. ## Members At all times, the parser object will have the following members: `line`, `column`, `position` - Indications of the position in the XML document where the parser currently is looking. `startTagPosition` - Indicates the position where the current tag starts. `closed` - Boolean indicating whether or not the parser can be written to. If it's `true`, then wait for the `ready` event to write again. `strict` - Boolean indicating whether or not the parser is a jerk. `opt` - Any options passed into the constructor. `tag` - The current tag being dealt with. And a bunch of other stuff that you probably shouldn't touch. ## Events All events emit with a single argument. To listen to an event, assign a function to `on<eventname>`. Functions get executed in the this-context of the parser object. The list of supported events are also in the exported `EVENTS` array. When using the stream interface, assign handlers using the EventEmitter `on` function in the normal fashion. `error` - Indication that something bad happened. The error will be hanging out on `parser.error`, and must be deleted before parsing can continue. By listening to this event, you can keep an eye on that kind of stuff. Note: this happens *much* more in strict mode. Argument: instance of `Error`. `text` - Text node. Argument: string of text. `doctype` - The `<!DOCTYPE` declaration. Argument: doctype string. `processinginstruction` - Stuff like `<?xml foo="blerg" ?>`. Argument: object with `name` and `body` members. Attributes are not parsed, as processing instructions have implementation dependent semantics. `sgmldeclaration` - Random SGML declarations. Stuff like `<!ENTITY p>` would trigger this kind of event. This is a weird thing to support, so it might go away at some point. SAX isn't intended to be used to parse SGML, after all. `opentagstart` - Emitted immediately when the tag name is available, but before any attributes are encountered. Argument: object with a `name` field and an empty `attributes` set. Note that this is the same object that will later be emitted in the `opentag` event. `opentag` - An opening tag. Argument: object with `name` and `attributes`. In non-strict mode, tag names are uppercased, unless the `lowercase` option is set. If the `xmlns` option is set, then it will contain namespace binding information on the `ns` member, and will have a `local`, `prefix`, and `uri` member. `closetag` - A closing tag. In loose mode, tags are auto-closed if their parent closes. In strict mode, well-formedness is enforced. Note that self-closing tags will have `closeTag` emitted immediately after `openTag`. Argument: tag name. `attribute` - An attribute node. Argument: object with `name` and `value`. In non-strict mode, attribute names are uppercased, unless the `lowercase` option is set. If the `xmlns` option is set, it will also contains namespace information. `comment` - A comment node. Argument: the string of the comment. `opencdata` - The opening tag of a `<![CDATA[` block. `cdata` - The text of a `<![CDATA[` block. Since `<![CDATA[` blocks can get quite large, this event may fire multiple times for a single block, if it is broken up into multiple `write()`s. Argument: the string of random character data. `closecdata` - The closing tag (`]]>`) of a `<![CDATA[` block. `opennamespace` - If the `xmlns` option is set, then this event will signal the start of a new namespace binding. `closenamespace` - If the `xmlns` option is set, then this event will signal the end of a namespace binding. `end` - Indication that the closed stream has ended. `ready` - Indication that the stream has reset, and is ready to be written to. `noscript` - In non-strict mode, `<script>` tags trigger a `"script"` event, and their contents are not checked for special xml characters. If you pass `noscript: true`, then this behavior is suppressed. ## Reporting Problems It's best to write a failing test if you find an issue. I will always accept pull requests with failing tests if they demonstrate intended behavior, but it is very hard to figure out what issue you're describing without a test. Writing a test is also the best way for you yourself to figure out if you really understand the issue you think you have with sax-js.
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