An evented streaming XML parser in JavaScript

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sax.parser = function (strict, opt) { return new SAXParser(strict, opt) };

// When we pass the MAX_BUFFER_LENGTH position, start checking for buffer overruns.

// When we check, schedule the next check for MAX_BUFFER_LENGTH - (max(buffer lengths)),

// since that's the earliest that a buffer overrun could occur.  This way, checks are

// as rare as required, but as often as necessary to ensure never crossing this bound.

// Furthermore, buffers are only tested at most once per write(), so passing a very

// large string into write() might have undesirable effects, but this is manageable by

// the caller, so it is assumed to be safe.  Thus, a call to write() may, in the extreme

// edge case, result in creating at most one complete copy of the string passed in.

// Set to Infinity to have unlimited buffers.

  "comment", "sgmlDecl", "textNode", "tagName", "doctype",

  "procInstName", "procInstBody", "entity", "attribName",

  this.bufferCheckPosition = sax.MAX_BUFFER_LENGTH;

  this.tagCase = this.opt.lowercasetags ? "toLowerCase" : "toUpperCase";

  this.closed = this.closedRoot = this.sawRoot = false;

  this.ENTITIES = Object.create(sax.ENTITIES);

  this.position = this.line = this.column = 0;

  var maxAllowed = Math.max(sax.MAX_BUFFER_LENGTH, 10),

  for (var i = 0, l = buffers.length; i < l; i ++) {

      // Text/cdata nodes can get big, and since they're buffered,

      // we can get here under normal conditions.

      // Avoid issues by emitting the text node now,

      // so at least it won't get any bigger.

        case "textNode": closeText(parser) ; break

          emitNode(parser, "oncdata", parser.cdata)

          error(parser, "Max buffer length exceeded: "+buffers[i])

    maxActual = Math.max(maxActual, len);

  // schedule the next check for the earliest possible buffer overrun.

  parser.bufferCheckPosition = (sax.MAX_BUFFER_LENGTH - maxActual) + parser.position;

  resume : function () { this.error = null; return this },

  close : function () { return this.write(null) },

  // this really needs to be replaced with character classes.

  // XML allows all manner of ridiculous numbers and digits.

  letter = "abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ",

function is (charclass, c) { return charclass.indexOf(c) !== -1 }

function not (charclass, c) { return !is(charclass, c) }

, TEXT                      : S++ // general stuff

, TEXT_ENTITY               : S++ // &amp and such.

, SGML_DECL                 : S++ // <!BLARG

, SGML_DECL_QUOTED          : S++ // <!BLARG foo "bar

          parser.textNode += chunk.substring(starti, i-1);

        if (c === "<") parser.state = S.OPEN_WAKA;

          if (not(whitespace, c) && (!parser.sawRoot || parser.closedRoot))

            strictFail("Text data outside of root node.");

          if (c === "&") parser.state = S.TEXT_ENTITY;

        // either a /, ?, !, or text is coming next.

          parser.procInstName = parser.procInstBody = "";

          strictFail(parser, "Unencoded <");

        if ((parser.sgmlDecl+c).toUpperCase() === CDATA) {

          emitNode(parser, "onopencdata");

        } else if (parser.sgmlDecl+c === "--") {

        } else if ((parser.sgmlDecl+c).toUpperCase() === DOCTYPE) {

          if (parser.doctype || parser.sawRoot) strictFail(parser,

            "Inappropriately located doctype declaration");

          emitNode(parser, "onsgmldeclaration", parser.sgmlDecl);

          parser.state = S.SGML_DECL_QUOTED;

          emitNode(parser, "ondoctype", parser.doctype);

          parser.doctype = true; // just remember that we saw it.

          if (c === "[") parser.state = S.DOCTYPE_DTD;

            parser.state = S.DOCTYPE_QUOTED;

        if (c === "]") parser.state = S.DOCTYPE;

          parser.state = S.DOCTYPE_DTD_QUOTED;

, "author" : "Isaac Z. Schlueter <i@izs.me>"

, "scripts" : { "test" : "node test/index.js" }

		@@ -281,7 +281,9 @@ // wrapper for non-node envs
		c = chunk.charAt(i++);
		parser.position ++;
		if (c === "\n") {
		parser.line ++;
		parser.column = 0;
		} else parser.column ++;
		if (c) {
		parser.position ++;
		if (c === "\n") {
		parser.line ++;
		parser.column = 0;
		} else parser.column ++;
		}
		}
		@@ -288,0 +290,0 @@ parser.textNode += chunk.substring(starti, i-1);

		{ "name" : "sax"
		, "author" : "Isaac Z. Schlueter <i@izs.me>"
		, "version" : "0.1.4"
		, "version" : "0.1.5"
		, "main" : "lib/sax"
		@@ -5,0 +5,0 @@ , "license" : "MIT"

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