From be1c7e50e1e8809ea56f2c9d472eccd8ffd73a97 Mon Sep 17 00:00:00 2001
From: Daniel Baumann <daniel.baumann@progress-linux.org>
Date: Fri, 19 Apr 2024 04:57:58 +0200
Subject: Adding upstream version 1.44.3.

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>
---
 web/server/h2o/libh2o/misc/oktavia/src/sax.jsx | 1356 ++++++++++++++++++++++++
 1 file changed, 1356 insertions(+)
 create mode 100644 web/server/h2o/libh2o/misc/oktavia/src/sax.jsx

(limited to 'web/server/h2o/libh2o/misc/oktavia/src/sax.jsx')

diff --git a/web/server/h2o/libh2o/misc/oktavia/src/sax.jsx b/web/server/h2o/libh2o/misc/oktavia/src/sax.jsx
new file mode 100644
index 00000000..d34cb825
--- /dev/null
+++ b/web/server/h2o/libh2o/misc/oktavia/src/sax.jsx
@@ -0,0 +1,1356 @@
+// 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.
+
+
+class Tag
+{
+    var name : string;
+    var attributes : Map.<string>;
+    var isSelfClosing : boolean;
+    function constructor (name : string)
+    {
+        this.name = name;
+        this.attributes = {} : Map.<string>;
+        this.isSelfClosing = false;
+    }
+}
+
+class _Common
+{
+    static const buffers = [
+        "comment", "sgmlDecl", "textNode", "tagName", "doctype",
+        "procInstName", "procInstBody", "entity", "attribName",
+        "attribValue", "cdata", "script"
+    ];
+
+    static const EVENTS = // for discoverability.
+    [ "text",
+      "processinginstruction",
+      "sgmldeclaration",
+      "doctype",
+      "comment",
+      "attribute",
+      "opentag",
+      "closetag",
+      "opencdata",
+      "cdata",
+      "clo_State.CDATA",
+      "error",
+      "end",
+      "ready",
+      "script",
+      "opennamespace",
+      "closenamespace"
+    ];
+
+    static const MAX_BUFFER_LENGTH = 64 * 1024;
+}
+
+class _State
+{
+    static const BEGIN                     = 1;
+    static const TEXT                      = 2;  // general stuff
+    static const TEXT_ENTITY               = 3;  // &amp and such.
+    static const OPEN_WAKA                 = 4;  // <
+    static const SGML_DECL                 = 5;  // <!BLARG
+    static const SGML_DECL_QUOTED          = 6;  // <!BLARG foo "bar
+    static const DOCTYPE                   = 7;  // <!DOCTYPE
+    static const DOCTYPE_QUOTED            = 8;  // <!DOCTYPE "//blah
+    static const DOCTYPE_DTD               = 9;  // <!DOCTYPE "//blah" [ ...
+    static const DOCTYPE_DTD_QUOTED        = 10; // <!DOCTYPE "//blah" [ "foo
+    static const COMMENT_STARTING          = 11; // <!-
+    static const COMMENT                   = 12; // <!--
+    static const COMMENT_ENDING            = 13; // <!-- blah -
+    static const COMMENT_ENDED             = 14; // <!-- blah --
+    static const CDATA                     = 15; // <![CDATA[ something
+    static const CDATA_ENDING              = 16; // ]
+    static const CDATA_ENDING_2            = 17; // ]]
+    static const PROC_INST                 = 18; // <?hi
+    static const PROC_INST_BODY            = 19; // <?hi there
+    static const PROC_INST_ENDING          = 20; // <?hi "there" ?
+    static const OPEN_TAG                  = 21; // <strong
+    static const OPEN_TAG_SLASH            = 22; // <strong /
+    static const ATTRIB                    = 23; // <a
+    static const ATTRIB_NAME               = 24; // <a foo
+    static const ATTRIB_NAME_SAW_WHITE     = 25; // <a foo _
+    static const ATTRIB_VALUE              = 26; // <a foo=
+    static const ATTRIB_VALUE_QUOTED       = 27; // <a foo="bar
+    static const ATTRIB_VALUE_UNQUOTED     = 28; // <a foo=bar
+    static const ATTRIB_VALUE_ENTITY_Q     = 29; // <foo bar="&quot;"
+    static const ATTRIB_VALUE_ENTITY_U     = 30; // <foo bar=&quot;
+    static const CLOSE_TAG                 = 31; // </a
+    static const CLOSE_TAG_SAW_WHITE       = 32; // </a   >
+    static const SCRIPT                    = 33; // <script> ...
+    static const SCRIPT_ENDING             = 34; // <script> ... <
+}
+
+
+class SAXHandler
+{
+    var position : int;
+    var column : int;
+    var line : int;
+    function constructor ()
+    {
+        this.position = 0;
+        this.column = 0;
+        this.line = 0;
+    }
+    function onerror (error : Error) : void
+    {
+    }
+    function ontext (text : string) : void
+    {
+    }
+    function ondoctype (doctype : string) : void
+    {
+    }
+    function onprocessinginstruction (name : string, body : string) : void
+    {
+    }
+    function onsgmldeclaration (sgmlDecl : string) : void
+    {
+    }
+    function onopentag (tagname : string, attributes : Map.<string>) : void
+    {
+    }
+    function onclosetag (tagname : string) : void
+    {
+    }
+    function onattribute (name : string, value : string) : void
+    {
+    }
+    function oncomment (comment : string) : void
+    {
+    }
+    function onopencdata () : void
+    {
+    }
+    function oncdata (cdata : string) : void
+    {
+    }
+    function onclosecdata () : void
+    {
+    }
+    function onend () : void
+    {
+    }
+    function onready () : void
+    {
+    }
+    function onscript (script : string) : void
+    {
+    }
+}
+
+class SAXParser
+{
+    var q : string;
+    var c : string;
+    var bufferCheckPosition : int;
+    var looseCase : string;
+    var tags = [] : Tag[];
+    var closed : boolean;
+    var closedRoot : boolean;
+    var sawRoot : boolean;
+    var tag : Nullable.<Tag>;
+    var error : Nullable.<Error>;
+    var handler : SAXHandler;
+    var ENTITIES : Map.<string>;
+    var strict : boolean;
+    var tagName : string;
+    var state : int;
+    var line : int;
+    var column : int;
+    var position : int;
+    var startTagPosition : int;
+    var attribName : string;
+    var attribValue : string;
+    var script : string;
+    var textNode : string;
+    var attribList : string[][];
+    var noscript : boolean;
+    var cdata : string;
+    var procInstBody : string;
+    var procInstName : string;
+    var doctype : string;
+    var entity : string;
+    var sgmlDecl : string;
+    var comment : string;
+    var preTags : int;
+
+    function constructor(handler : SAXHandler)
+    {
+        this._init(handler, false);
+    }
+
+    function constructor(handler : SAXHandler, strict : boolean)
+    {
+        this._init(handler, strict);
+    }
+
+    function _init (handler : SAXHandler, strict : boolean) : void
+    {
+        this.handler = handler;
+        this.clearBuffers();
+        this.q = "";
+        this.bufferCheckPosition = _Common.MAX_BUFFER_LENGTH;
+        //this.opt = opt || {}
+        //this.opt.lowercase = this.opt.lowercase || this.opt.lowercasetags
+        this.looseCase = 'toLowerCase'; // this.opt.lowercase ? "toLowerCase" : "toUpperCase"
+        this.tags = [] : Tag[];
+        this.closed = this.closedRoot = this.sawRoot = false;
+        this.tag = null;
+        this.error = null;
+        this.strict = strict;
+        this.noscript = strict; //!!(strict || this.opt.noscript);
+        this.state = _State.BEGIN;
+        this.ENTITIES = _Entities.entity_list();
+        this.attribList = [] : string[][];
+        this.noscript = false;
+        this.preTags = 0;
+
+        this.handler.onready();
+    }
+
+    function set_noscript (flag : boolean) : void
+    {
+        this.noscript = flag;
+    }
+
+    function resume () : SAXParser
+    {
+        this.error = null;
+        return this;
+    }
+
+    function close () : SAXParser
+    {
+        return this.parse('');
+    }
+
+    function parse (chunk : string) : SAXParser
+    {
+        var _ = new Char();
+        if (this.error)
+        {
+            throw this.error;
+        }
+        if (this.closed)
+        {
+            return this.emiterror("Cannot write after close. Assign an onready handler.");
+        }
+        var i = 0, c = "";
+        while (this.c = c = chunk.charAt(i++))
+        {
+            this.position++;
+            if (c == "\n")
+            {
+                this.handler.line++;
+                this.handler.column = 0;
+            }
+            else
+            {
+                this.handler.column++;
+            }
+            switch (this.state)
+            {
+            case _State.BEGIN:
+                //log "BEGIN";
+                if (c == "<")
+                {
+                    this.state = _State.OPEN_WAKA;
+                    this.startTagPosition = this.position;
+                }
+                else if (_.not(_.whitespace, c))
+                {
+                    // have to process this as a text node.
+                    // weird, but happens.
+                    this.strictFail("Non-whitespace before first tag.");
+                    this.textNode = c;
+                    this.state = _State.TEXT;
+                }
+                continue;
+
+            case _State.TEXT:
+                //log "TEXT";
+                if (this.sawRoot && !this.closedRoot)
+                {
+                    var starti = i - 1;
+                    while (c && c != "<" && c != "&")
+                    {
+                        c = chunk.charAt(i++);
+                        if (c)
+                        {
+                            this.position++;
+                            if (c == "\n")
+                            {
+                                this.handler.line++;
+                                this.handler.column = 0;
+                            }
+                            else
+                            {
+                                this.handler.column++;
+                            }
+                        }
+                    }
+                    this.textNode += chunk.substring(starti, i - 1);
+                }
+                if (c == "<")
+                {
+                    this.state = _State.OPEN_WAKA;
+                    this.startTagPosition = this.position;
+                }
+                else
+                {
+                    if (_.not(_.whitespace, c) && (!this.sawRoot || this.closedRoot))
+                        this.strictFail("Text data outside of root node.");
+                    if (c == "&") this.state = _State.TEXT_ENTITY;
+                    else this.textNode += c;
+                }
+                continue;
+
+            case _State.SCRIPT:
+                //log "SCRIPT";
+                // only non-strict
+                if (c == "<") {
+                    this.state = _State.SCRIPT_ENDING;
+                } else this.script += c;
+                continue;
+
+            case _State.SCRIPT_ENDING:
+                //log "SCRIPT END";
+                if (c == "/") {
+                    this.state = _State.CLOSE_TAG;
+                } else {
+                    this.script += "<" + c;
+                    this.state = _State.SCRIPT;
+                }
+                continue;
+
+            case _State.OPEN_WAKA:
+                //log "OPEN_WAKA";
+                // either a /, ?, !, or text is coming next.
+                if (c == "!") {
+                    this.state = _State.SGML_DECL;
+                    this.sgmlDecl = "";
+                } else if (_.is(_.whitespace, c)) {
+                    // wait for it...
+                } else if (_.is(_.nameStart,c)) {
+                    this.state = _State.OPEN_TAG;
+                    this.tagName = c;
+                } else if (c == "/") {
+                    this.state = _State.CLOSE_TAG;
+                    this.tagName = "";
+                } else if (c == "?") {
+                    this.state = _State.PROC_INST;
+                    this.procInstName = this.procInstBody = "";
+                } else {
+                    this.strictFail("Unencoded <");
+                    // if there was some whitespace, then add that in.
+                    if (this.startTagPosition + 1 < this.position) {
+                        var pad = this.position - this.startTagPosition;
+                        for (var i = 0; i < pad; i++)
+                        {
+                            c = " " + c;
+                        }
+                    }
+                    this.textNode += "<" + c;
+                    this.state = _State.TEXT;
+                }
+                continue;
+
+            case _State.SGML_DECL:
+                //log "SGML_DECL";
+                if ((this.sgmlDecl+c).toUpperCase() == _.CDATA) {
+                    this.closetext_if_exist();
+                    this.handler.onopencdata();
+                    this.state = _State.CDATA;
+                    this.sgmlDecl = "";
+                    this.cdata = "";
+                } else if (this.sgmlDecl+c == "--") {
+                    this.state = _State.COMMENT;
+                    this.comment = "";
+                    this.sgmlDecl = "";
+                } else if ((this.sgmlDecl+c).toUpperCase() == _.DOCTYPE) {
+                    this.state = _State.DOCTYPE;
+                    if (this.doctype || this.sawRoot)
+                    {
+                        this.strictFail("Inappropriately located doctype declaration");
+                    }
+                    this.doctype = "";
+                    this.sgmlDecl = "";
+                } else if (c == ">") {
+                    this.closetext_if_exist();
+                    this.handler.onsgmldeclaration(this.sgmlDecl);
+                    this.sgmlDecl = "";
+                    this.state = _State.TEXT;
+                } else if (_.is(_.quote, c)) {
+                    this.state = _State.SGML_DECL_QUOTED;
+                    this.sgmlDecl += c;
+                } else this.sgmlDecl += c;
+                continue;
+
+            case _State.SGML_DECL_QUOTED:
+                //log "SGML_DECL_QUOTED";
+                if (c == this.q) {
+                    this.state = _State.SGML_DECL;
+                    this.q = "";
+                }
+                this.sgmlDecl += c;
+                continue;
+
+            case _State.DOCTYPE:
+                //log "DOCTYPE";
+                if (c == ">") {
+                    this.state = _State.TEXT;
+                    this.closetext_if_exist();
+                    this.handler.ondoctype(this.doctype.trim());
+                } else {
+                    this.doctype += c;
+                    if (c == "[") this.state = _State.DOCTYPE_DTD;
+                    else if (_.is(_.quote, c)) {
+                      this.state = _State.DOCTYPE_QUOTED;
+                      this.q = c;
+                    }
+                }
+                continue;
+
+            case _State.DOCTYPE_QUOTED:
+                //log "DOCTYPE_QUOTED";
+                this.doctype += c;
+                if (c == this.q) {
+                    this.q = "";
+                    this.state = _State.DOCTYPE;
+                }
+                continue;
+
+            case _State.DOCTYPE_DTD:
+                //log "DOCTYPE_DTD";
+                this.doctype += c;
+                if (c == "]") this.state = _State.DOCTYPE;
+                else if (_.is(_.quote,c)) {
+                    this.state = _State.DOCTYPE_DTD_QUOTED;
+                    this.q = c;
+                }
+                continue;
+
+            case _State.DOCTYPE_DTD_QUOTED:
+                //log "DOCTYPE_DTD_QUOTED";
+                this.doctype += c;
+                if (c == this.q) {
+                    this.state = _State.DOCTYPE_DTD;
+                    this.q = "";
+                }
+                continue;
+
+            case _State.COMMENT:
+                //log "COMMENT";
+                if (c == "-") this.state = _State.COMMENT_ENDING;
+                else this.comment += c;
+                continue;
+
+            case _State.COMMENT_ENDING:
+                //log "COMMENT_ENDING";
+                if (c == "-") {
+                    this.state = _State.COMMENT_ENDED;
+                    this.comment = this.textopts(this.comment);
+                    if (this.comment)
+                    {
+                        this.closetext_if_exist();
+                        this.handler.oncomment(this.comment.trim());
+                    }
+                    this.comment = "";
+                } else {
+                    this.comment += "-" + c;
+                    this.state = _State.COMMENT;
+                }
+                continue;
+
+            case _State.COMMENT_ENDED:
+                //log "COMMENT_ENDED";
+                if (c != ">") {
+                    this.strictFail("Malformed comment");
+                    // allow <!-- blah -- bloo --> in non-strict mode,
+                    // which is a comment of " blah -- bloo "
+                    this.comment += "--" + c;
+                    this.state = _State.COMMENT;
+                } else this.state = _State.TEXT;
+                continue;
+
+            case _State.CDATA:
+                //log "CDATA";
+                if (c == "]") this.state = _State.CDATA_ENDING;
+                else this.cdata += c;
+                continue;
+
+            case _State.CDATA_ENDING:
+                //log "CDATA_ENDING";
+                if (c == "]") this.state = _State.CDATA_ENDING_2;
+                else {
+                    this.cdata += "]" + c;
+                    this.state = _State.CDATA;
+                }
+                continue;
+
+            case _State.CDATA_ENDING_2:
+                //log "CDATA_ENDING 2";
+                if (c == ">") {
+                    if (this.cdata)
+                    {
+                        this.closetext_if_exist();
+                    }
+                    this.handler.oncdata(this.cdata);
+                    this.handler.onclosecdata();
+                    this.cdata = "";
+                    this.state = _State.TEXT;
+                } else if (c == "]") {
+                    this.cdata += "]";
+                } else {
+                    this.cdata += "]]" + c;
+                    this.state = _State.CDATA;
+                }
+                continue;
+
+            case _State.PROC_INST:
+                if (c == "?") this.state = _State.PROC_INST_ENDING;
+                else if (_.is(_.whitespace, c)) this.state = _State.PROC_INST_BODY;
+                else this.procInstName += c;
+                continue;
+
+            case _State.PROC_INST_BODY:
+                if (!this.procInstBody && _.is(_.whitespace, c)) continue;
+                else if (c == "?") this.state = _State.PROC_INST_ENDING;
+                else this.procInstBody += c;
+                continue;
+
+            case _State.PROC_INST_ENDING:
+                if (c == ">") {
+                    this.closetext_if_exist();
+                    this.handler.onprocessinginstruction(this.procInstName, this.procInstBody);
+                    this.procInstName = this.procInstBody = "";
+                    this.state = _State.TEXT;
+                } else {
+                    this.procInstBody += "?" + c;
+                    this.state = _State.PROC_INST_BODY;
+                }
+                continue;
+
+            case _State.OPEN_TAG:
+                //log "OPEN TAG";
+                if (_.is(_.nameBody, c)) this.tagName += c;
+                else {
+                    this.newTag();
+                    if (c == ">") this.openTag();
+                    else if (c == "/") this.state = _State.OPEN_TAG_SLASH;
+                    else {
+                        if (_.not(_.whitespace, c)) this.strictFail("Invalid character in tag name");
+                        this.state = _State.ATTRIB;
+                    }
+                }
+                continue;
+
+            case _State.OPEN_TAG_SLASH:
+                //log "OPEN TAG SLASH";
+                if (c == ">") {
+                    this.openTag(true);
+                    this.closeTag();
+                } else {
+                    this.strictFail("Forward-slash in opening tag not followed by >");
+                    this.state = _State.ATTRIB;
+                }
+                continue;
+
+            case _State.ATTRIB:
+                //log "ATTRIB";
+                // haven't read the attribute name yet.
+                if (_.is(_.whitespace, c)) continue;
+                else if (c == ">") this.openTag();
+                else if (c == "/") this.state = _State.OPEN_TAG_SLASH;
+                else if (_.is(_.nameStart, c)) {
+                    this.attribName = c;
+                    this.attribValue = "";
+                    this.state = _State.ATTRIB_NAME;
+                } else this.strictFail("Invalid attribute name");
+                continue;
+
+            case _State.ATTRIB_NAME:
+                //log "ATTRIB_NAME";
+                if (c == "=") this.state = _State.ATTRIB_VALUE;
+                else if (c == ">") {
+                    this.strictFail("Attribute without value");
+                    this.attribValue = this.attribName;
+                    this.attrib();
+                    this.openTag();
+                }
+                else if (_.is(_.whitespace, c)) this.state = _State.ATTRIB_NAME_SAW_WHITE;
+                else if (_.is(_.nameBody, c)) this.attribName += c;
+                else this.strictFail("Invalid attribute name");
+                continue;
+
+            case _State.ATTRIB_NAME_SAW_WHITE:
+                if (c == "=") this.state = _State.ATTRIB_VALUE;
+                else if (_.is(_.whitespace, c)) continue;
+                else {
+                    this.strictFail( "Attribute without value");
+                    this.tag.attributes[this.attribName] = "";
+                    this.attribValue = "";
+                    this.closetext_if_exist();
+                    this.handler.onattribute(this.attribName, "");
+                    this.attribName = "";
+                    if (c == ">") this.openTag();
+                    else if (_.is(_.nameStart, c)) {
+                        this.attribName = c;
+                        this.state = _State.ATTRIB_NAME;
+                    } else {
+                        this.strictFail("Invalid attribute name");
+                        this.state = _State.ATTRIB;
+                    }
+                }
+                continue;
+
+            case _State.ATTRIB_VALUE:
+                if (_.is(_.whitespace, c)) continue;
+                else if (_.is(_.quote, c)) {
+                    this.q = c;
+                    this.state = _State.ATTRIB_VALUE_QUOTED;
+                } else {
+                    this.strictFail("Unquoted attribute value");
+                    this.state = _State.ATTRIB_VALUE_UNQUOTED;
+                    this.attribValue = c;
+                }
+                continue;
+
+            case _State.ATTRIB_VALUE_QUOTED:
+                if (c != this.q) {
+                    if (c == "&") this.state = _State.ATTRIB_VALUE_ENTITY_Q;
+                    else this.attribValue += c;
+                    continue;
+                }
+                this.attrib();
+                this.q = "";
+                this.state = _State.ATTRIB;
+                continue;
+
+            case _State.ATTRIB_VALUE_UNQUOTED:
+                if (_.not(_.attribEnd,c)) {
+                    if (c == "&") this.state = _State.ATTRIB_VALUE_ENTITY_U;
+                    else this.attribValue += c;
+                    continue;
+                }
+                this.attrib();
+                if (c == ">") this.openTag();
+                else this.state = _State.ATTRIB;
+                continue;
+
+            case _State.CLOSE_TAG:
+                //log "CLOSE_TAG", c;
+                if (!this.tagName)
+                {
+                    if (_.is(_.whitespace, c))
+                    {
+                        continue;
+                    }
+                    else if (_.not(_.nameStart, c))
+                    {
+                        if (this.script)
+                        {
+                            this.script += "</" + c;
+                            this.state = _State.SCRIPT;
+                        }
+                        else
+                        {
+                            this.strictFail("Invalid tagname in closing tag.");
+                        }
+                    }
+                    else
+                    {
+                        this.tagName = c;
+                    }
+                }
+                else if (c == ">")
+                {
+                    this.closeTag();
+                }
+                else if (_.is(_.nameBody, c))
+                {
+                    this.tagName += c;
+                }
+                else if (this.script)
+                {
+                    this.script += "</" + this.tagName;
+                    this.tagName = "";
+                    this.state = _State.SCRIPT;
+                }
+                else
+                {
+                    if (_.not(_.whitespace, c))
+                    {
+                        this.strictFail("Invalid tagname in closing tag");
+                    }
+                    this.state = _State.CLOSE_TAG_SAW_WHITE;
+                }
+                continue;
+
+            case _State.CLOSE_TAG_SAW_WHITE:
+                if (_.is(_.whitespace, c)) continue;
+                if (c == ">") this.closeTag();
+                else this.strictFail("Invalid characters in closing tag");
+                continue;
+
+            case _State.TEXT_ENTITY:
+                //log "TEXT_ENTITY";
+                if (c == ";") {
+                    this.textNode += this.parseEntity();
+                    this.entity = "";
+                    this.state = _State.TEXT;
+                }
+                else if (_.is(_.entity, c)) this.entity += c;
+                else {
+                    this.strictFail("Invalid character entity");
+                    this.textNode += "&" + this.entity + c;
+                    this.entity = "";
+                    this.state = _State.TEXT;
+                }
+                continue;
+
+            case _State.ATTRIB_VALUE_ENTITY_Q:
+            case _State.ATTRIB_VALUE_ENTITY_U:
+                var returnState;
+                if (this.state == _State.ATTRIB_VALUE_ENTITY_Q)
+                {
+                    returnState = _State.ATTRIB_VALUE_QUOTED;
+                }
+                else
+                {
+                    returnState = _State.ATTRIB_VALUE_UNQUOTED;
+                }
+                if (c == ";") {
+                    this.attribValue += this.parseEntity();
+                    this.entity = "";
+                    this.state = returnState;
+                }
+                else if (_.is(_.entity, c)) this.entity += c;
+                else {
+                    this.strictFail("Invalid character entity");
+                    this.attribValue += "&" + this.entity + c;
+                    this.entity = "";
+                    this.state = returnState;
+                }
+                continue;
+
+            default:
+                throw new Error("Unknown state: " + (this.state as string));
+            }
+        }
+        this.end();
+        return this;
+    }
+
+    function clearBuffers () : void
+    {
+        this.comment = '';
+        this.sgmlDecl = '';
+        this.textNode = '';
+        this.tagName = '';
+        this.doctype = '';
+        this.procInstName = '';
+        this.procInstBody = '';
+        this.entity = '';
+        this.attribName = '';
+        this.attribValue = '';
+        this.cdata = '';
+        this.script = '';
+    }
+
+    function closetext_if_exist() : void
+    {
+        if (this.textNode != '')
+        {
+            this.closetext();
+        }
+    }
+
+    function closetext () : void
+    {
+        if (this.preTags == 0)
+        {
+            var text = this.textopts(this.textNode);
+            if (text)
+            {
+                this.handler.ontext(text);
+            }
+        }
+        else if (this.textNode)
+        {
+            this.handler.ontext(this.textNode);
+        }
+        this.textNode = "";
+    }
+
+    function textopts (text : string) : string
+    {
+        text = text.replace(/[\n\t]/g, ' ');
+        text = text.replace(/\s\s+/g, " ");
+        return text;
+    }
+
+    function emiterror (er : string) : SAXParser
+    {
+        this.closetext();
+        er += "\nLine: " + (this.line as string) +
+              "\nColumn: " + (this.column as string) +
+              "\nChar: " + this.c;
+        var error = new Error(er);
+        this.error = error;
+        this.handler.onerror(error);
+        return this;
+    }
+
+    function end () : void
+    {
+        if (!this.closedRoot)
+        {
+            this.strictFail("Unclosed root tag");
+        }
+        if (this.state != _State.TEXT)
+        {
+            this.emiterror("Unexpected end");
+        }
+        this.closetext();
+        this.c = "";
+        this.closed = true;
+        this.handler.onend();
+    }
+
+    function strictFail (message : string) : void
+    {
+        if (this.strict)
+        {
+            this.emiterror(message);
+        }
+    }
+
+    function newTag () : void
+    {
+        if (!this.strict) this.tagName = this.tagName.toLowerCase();
+        var parent = this.tags[this.tags.length - 1] || this;
+        var tag = this.tag = new Tag(this.tagName);
+        this.attribList.length = 0;
+    }
+
+    function attrib () : void
+    {
+        if (!this.strict) this.attribName = this.attribName.toLowerCase();
+
+        if (this.tag.attributes.hasOwnProperty(this.attribName)) {
+            this.attribName = this.attribValue = "";
+            return;
+        }
+
+        this.tag.attributes[this.attribName] = this.attribValue;
+        this.closetext_if_exist();
+        this.handler.onattribute(this.attribName, this.attribValue);
+        this.attribName = this.attribValue = "";
+    }
+
+    function openTag () : void
+    {
+        this.openTag(false);
+    }
+
+    function openTag (selfClosing : boolean) : void
+    {
+        this.tag.isSelfClosing = selfClosing;
+
+        // process the tag
+        this.sawRoot = true;
+        this.tags.push(this.tag);
+        this.closetext_if_exist();
+        this.handler.onopentag(this.tag.name, this.tag.attributes);
+        if (this.tag.name == 'pre')
+        {
+            this.preTags++;
+        }
+        if (!selfClosing)
+        {
+            // special case for <script> in non-strict mode.
+            if (!this.noscript && this.tagName.toLowerCase() == "script")
+            {
+                this.state = _State.SCRIPT;
+            }
+            else
+            {
+                this.state = _State.TEXT;
+            }
+            this.tag = null;
+            this.tagName = "";
+        }
+        this.attribName = this.attribValue = "";
+        this.attribList.length = 0;
+    }
+
+    function closeTag () : void
+    {
+        if (!this.tagName)
+        {
+            this.strictFail("Weird empty close tag.");
+            this.textNode += "</>";
+            this.state = _State.TEXT;
+            return;
+        }
+
+        if (this.script)
+        {
+            if (this.tagName != "script")
+            {
+                this.script += "</" + this.tagName + ">";
+                this.tagName = "";
+                this.state = _State.SCRIPT;
+                return;
+            }
+            this.closetext_if_exist();
+            this.handler.onscript(this.script);
+            this.script = "";
+        }
+
+        // first make sure that the closing tag actually exists.
+        // <a><b></c></b></a> will close everything, otherwise.
+        var t = this.tags.length;
+        var tagName = this.tagName;
+        if (!this.strict) tagName = tagName.toLowerCase();
+        var closeTo = tagName;
+        while (t --) {
+            var close = this.tags[t];
+            if (close.name != closeTo) {
+                // fail the first time in strict mode
+                this.strictFail("Unexpected close tag");
+            } else break;
+        }
+
+        // didn't find it.  we already failed for strict, so just abort.
+        if (t < 0)
+        {
+            this.strictFail("Unmatched closing tag: "+this.tagName);
+            this.textNode += "</" + this.tagName + ">";
+            this.state = _State.TEXT;
+            return;
+        }
+        this.tagName = tagName;
+        var s = this.tags.length;
+        while (s --> t)
+        {
+            var tag = this.tag = this.tags.pop();
+            this.tagName = this.tag.name;
+            this.closetext_if_exist();
+            this.handler.onclosetag(this.tagName);
+            var parent = this.tags[this.tags.length - 1];
+            if (this.tagName == 'pre')
+            {
+                this.preTags--;
+            }
+        }
+        if (t == 0)
+        {
+            this.closedRoot = true;
+        }
+        this.tagName = this.attribValue = this.attribName = "";
+        this.attribList.length = 0;
+        this.state = _State.TEXT;
+    }
+
+    function parseEntity () : string
+    {
+        var entity = this.entity;
+        var entityLC = entity.toLowerCase();
+        var num = 0;
+        var numStr = "";
+        if (this.ENTITIES[entity])
+        {
+            return this.ENTITIES[entity];
+        }
+        if (this.ENTITIES[entityLC])
+        {
+            return this.ENTITIES[entityLC];
+        }
+        entity = entityLC;
+        if (entity.charAt(0) == "#")
+        {
+            if (entity.charAt(1) == "x")
+            {
+                entity = entity.slice(2);
+                num = Number.parseInt(entity, 16);
+                numStr = num.toString(16);
+            }
+            else
+            {
+                entity = entity.slice(1);
+                num = Number.parseInt(entity, 10);
+                numStr = num.toString(10);
+            }
+        }
+        entity = entity.replace(/^0+/, "");
+        if (numStr.toLowerCase() != entity) {
+            this.strictFail("Invalid character entity");
+            return "&"+this.entity + ";";
+        }
+        return String.fromCharCode(num);
+    }
+}
+
+class Char
+{
+    var whitespace : Map.<boolean>;
+    var number : Map.<boolean>;
+    var letter : Map.<boolean>;
+    var quote : Map.<boolean>;
+    var entity : Map.<boolean>;
+    var attribEnd : Map.<boolean>;
+    var nameStart : RegExp;
+    var nameBody : RegExp;
+    var CDATA : string;
+    var DOCTYPE : string;
+    var XML_NAMESPACE : string;
+
+    function constructor()
+    {
+        // character classes and tokens
+        var whitespace = "\r\n\t ";
+        // this really needs to be replaced with character classes.
+        // XML allows all manner of ridiculous numbers and digits.
+        var number = "0124356789";
+        var letter = "abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ";
+        // (Letter | "_" | ":")
+        var quote = "'\"";
+        var entity = number+letter+"#";
+        var attribEnd = whitespace + ">";
+        this.CDATA = "[CDATA[";
+        this.DOCTYPE = "DOCTYPE";
+        this.XML_NAMESPACE = "http://www.w3.org/XML/1998/namespace";
+
+        // turn all the string character sets into character class objects.
+        this.whitespace = this._charClass(whitespace);
+        this.number = this._charClass(number);
+        this.letter = this._charClass(letter);
+        this.quote = this._charClass(quote);
+        this.entity = this._charClass(entity);
+        this.attribEnd = this._charClass(attribEnd);
+        this.nameStart = /[:_A-Za-z\u00C0-\u00D6\u00D8-\u00F6\u00F8-\u02FF\u0370-\u037D\u037F-\u1FFF\u200C-\u200D\u2070-\u218F\u2C00-\u2FEF\u3001-\uD7FF\uF900-\uFDCF\uFDF0-\uFFFD]/;
+
+        this.nameBody = /[:_A-Za-z\u00C0-\u00D6\u00D8-\u00F6\u00F8-\u02FF\u0370-\u037D\u037F-\u1FFF\u200C-\u200D\u2070-\u218F\u2C00-\u2FEF\u3001-\uD7FF\uF900-\uFDCF\uFDF0-\uFFFD\u00B7\u0300-\u036F\u203F-\u2040\.\d-]/;
+    }
+
+    function _charClass (str : string) : Map.<boolean>
+    {
+        var result = {} : Map.<boolean>;
+        for (var i = 0; i < str.length; i++)
+        {
+            result[str.slice(i, i + 1)] = true;
+        }
+        return result;
+    }
+
+    function is (charclass : RegExp, c : string) : boolean
+    {
+        return charclass.test(c);
+    }
+
+    function is (charclass : Map.<boolean>, c : string) : boolean
+    {
+        return charclass.hasOwnProperty(c);
+    }
+
+    function not (charclass : RegExp, c : string) : boolean {
+        return !this.is(charclass, c);
+    }
+
+    function not (charclass : Map.<boolean>, c : string) : boolean {
+        return !this.is(charclass, c);
+    }
+}
+
+
+class _Entities
+{
+    static const _entities = {
+       "amp" : "&",
+       "gt" : ">",
+       "lt" : "<",
+       "quot" : "\"",
+       "apos" : "'",
+       "AElig" : 198,
+       "Aacute" : 193,
+       "Acirc" : 194,
+       "Agrave" : 192,
+       "Aring" : 197,
+       "Atilde" : 195,
+       "Auml" : 196,
+       "Ccedil" : 199,
+       "ETH" : 208,
+       "Eacute" : 201,
+       "Ecirc" : 202,
+       "Egrave" : 200,
+       "Euml" : 203,
+       "Iacute" : 205,
+       "Icirc" : 206,
+       "Igrave" : 204,
+       "Iuml" : 207,
+       "Ntilde" : 209,
+       "Oacute" : 211,
+       "Ocirc" : 212,
+       "Ograve" : 210,
+       "Oslash" : 216,
+       "Otilde" : 213,
+       "Ouml" : 214,
+       "THORN" : 222,
+       "Uacute" : 218,
+       "Ucirc" : 219,
+       "Ugrave" : 217,
+       "Uuml" : 220,
+       "Yacute" : 221,
+       "aacute" : 225,
+       "acirc" : 226,
+       "aelig" : 230,
+       "agrave" : 224,
+       "aring" : 229,
+       "atilde" : 227,
+       "auml" : 228,
+       "ccedil" : 231,
+       "eacute" : 233,
+       "ecirc" : 234,
+       "egrave" : 232,
+       "eth" : 240,
+       "euml" : 235,
+       "iacute" : 237,
+       "icirc" : 238,
+       "igrave" : 236,
+       "iuml" : 239,
+       "ntilde" : 241,
+       "oacute" : 243,
+       "ocirc" : 244,
+       "ograve" : 242,
+       "oslash" : 248,
+       "otilde" : 245,
+       "ouml" : 246,
+       "szlig" : 223,
+       "thorn" : 254,
+       "uacute" : 250,
+       "ucirc" : 251,
+       "ugrave" : 249,
+       "uuml" : 252,
+       "yacute" : 253,
+       "yuml" : 255,
+       "copy" : 169,
+       "reg" : 174,
+       "nbsp" : 160,
+       "iexcl" : 161,
+       "cent" : 162,
+       "pound" : 163,
+       "curren" : 164,
+       "yen" : 165,
+       "brvbar" : 166,
+       "sect" : 167,
+       "uml" : 168,
+       "ordf" : 170,
+       "laquo" : 171,
+       "not" : 172,
+       "shy" : 173,
+       "macr" : 175,
+       "deg" : 176,
+       "plusmn" : 177,
+       "sup1" : 185,
+       "sup2" : 178,
+       "sup3" : 179,
+       "acute" : 180,
+       "micro" : 181,
+       "para" : 182,
+       "middot" : 183,
+       "cedil" : 184,
+       "ordm" : 186,
+       "raquo" : 187,
+       "frac14" : 188,
+       "frac12" : 189,
+       "frac34" : 190,
+       "iquest" : 191,
+       "times" : 215,
+       "divide" : 247,
+       "OElig" : 338,
+       "oelig" : 339,
+       "Scaron" : 352,
+       "scaron" : 353,
+       "Yuml" : 376,
+       "fnof" : 402,
+       "circ" : 710,
+       "tilde" : 732,
+       "Alpha" : 913,
+       "Beta" : 914,
+       "Gamma" : 915,
+       "Delta" : 916,
+       "Epsilon" : 917,
+       "Zeta" : 918,
+       "Eta" : 919,
+       "Theta" : 920,
+       "Iota" : 921,
+       "Kappa" : 922,
+       "Lambda" : 923,
+       "Mu" : 924,
+       "Nu" : 925,
+       "Xi" : 926,
+       "Omicron" : 927,
+       "Pi" : 928,
+       "Rho" : 929,
+       "Sigma" : 931,
+       "Tau" : 932,
+       "Upsilon" : 933,
+       "Phi" : 934,
+       "Chi" : 935,
+       "Psi" : 936,
+       "Omega" : 937,
+       "alpha" : 945,
+       "beta" : 946,
+       "gamma" : 947,
+       "delta" : 948,
+       "epsilon" : 949,
+       "zeta" : 950,
+       "eta" : 951,
+       "theta" : 952,
+       "iota" : 953,
+       "kappa" : 954,
+       "lambda" : 955,
+       "mu" : 956,
+       "nu" : 957,
+       "xi" : 958,
+       "omicron" : 959,
+       "pi" : 960,
+       "rho" : 961,
+       "sigmaf" : 962,
+       "sigma" : 963,
+       "tau" : 964,
+       "upsilon" : 965,
+       "phi" : 966,
+       "chi" : 967,
+       "psi" : 968,
+       "omega" : 969,
+       "thetasym" : 977,
+       "upsih" : 978,
+       "piv" : 982,
+       "ensp" : 8194,
+       "emsp" : 8195,
+       "thinsp" : 8201,
+       "zwnj" : 8204,
+       "zwj" : 8205,
+       "lrm" : 8206,
+       "rlm" : 8207,
+       "ndash" : 8211,
+       "mdash" : 8212,
+       "lsquo" : 8216,
+       "rsquo" : 8217,
+       "sbquo" : 8218,
+       "ldquo" : 8220,
+       "rdquo" : 8221,
+       "bdquo" : 8222,
+       "dagger" : 8224,
+       "Dagger" : 8225,
+       "bull" : 8226,
+       "hellip" : 8230,
+       "permil" : 8240,
+       "prime" : 8242,
+       "Prime" : 8243,
+       "lsaquo" : 8249,
+       "rsaquo" : 8250,
+       "oline" : 8254,
+       "frasl" : 8260,
+       "euro" : 8364,
+       "image" : 8465,
+       "weierp" : 8472,
+       "real" : 8476,
+       "trade" : 8482,
+       "alefsym" : 8501,
+       "larr" : 8592,
+       "uarr" : 8593,
+       "rarr" : 8594,
+       "darr" : 8595,
+       "harr" : 8596,
+       "crarr" : 8629,
+       "lArr" : 8656,
+       "uArr" : 8657,
+       "rArr" : 8658,
+       "dArr" : 8659,
+       "hArr" : 8660,
+       "forall" : 8704,
+       "part" : 8706,
+       "exist" : 8707,
+       "empty" : 8709,
+       "nabla" : 8711,
+       "isin" : 8712,
+       "notin" : 8713,
+       "ni" : 8715,
+       "prod" : 8719,
+       "sum" : 8721,
+       "minus" : 8722,
+       "lowast" : 8727,
+       "radic" : 8730,
+       "prop" : 8733,
+       "infin" : 8734,
+       "ang" : 8736,
+       "and" : 8743,
+       "or" : 8744,
+       "cap" : 8745,
+       "cup" : 8746,
+       "int" : 8747,
+       "there4" : 8756,
+       "sim" : 8764,
+       "cong" : 8773,
+       "asymp" : 8776,
+       "ne" : 8800,
+       "equiv" : 8801,
+       "le" : 8804,
+       "ge" : 8805,
+       "sub" : 8834,
+       "sup" : 8835,
+       "nsub" : 8836,
+       "sube" : 8838,
+       "supe" : 8839,
+       "oplus" : 8853,
+       "otimes" : 8855,
+       "perp" : 8869,
+       "sdot" : 8901,
+       "lceil" : 8968,
+       "rceil" : 8969,
+       "lfloor" : 8970,
+       "rfloor" : 8971,
+       "lang" : 9001,
+       "rang" : 9002,
+       "loz" : 9674,
+       "spades" : 9824,
+       "clubs" : 9827,
+       "hearts" : 9829,
+       "diams" : 9830
+    } : Map.<variant>;
+
+    static function entity_list () : Map.<string>
+    {
+        var result = {} : Map.<string>;
+        for (var key in _Entities._entities)
+        {
+            var value : variant = _Entities._entities[key];
+            if (typeof(value) == 'string')
+            {
+                result[key] = value as string;
+            }
+            else if (typeof(value) == 'number')
+            {
+                result[key] = String.fromCharCode(value as int);
+            }
+        }
+        return result;
+    }
+}
+
-- 
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