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"use strict";
Object.defineProperty(exports, "__esModule", { value: true });
const ed5 = require("xmlchars/xml/1.0/ed5");
const ed2 = require("xmlchars/xml/1.1/ed2");
const NSed3 = require("xmlchars/xmlns/1.0/ed3");
var isS = ed5.isS;
var isChar10 = ed5.isChar;
var isNameStartChar = ed5.isNameStartChar;
var isNameChar = ed5.isNameChar;
var S_LIST = ed5.S_LIST;
var NAME_RE = ed5.NAME_RE;
var isChar11 = ed2.isChar;
var isNCNameStartChar = NSed3.isNCNameStartChar;
var isNCNameChar = NSed3.isNCNameChar;
var NC_NAME_RE = NSed3.NC_NAME_RE;
const XML_NAMESPACE = "http://www.w3.org/XML/1998/namespace";
const XMLNS_NAMESPACE = "http://www.w3.org/2000/xmlns/";
const rootNS = {
    // eslint-disable-next-line @typescript-eslint/no-explicit-any
    __proto__: null,
    xml: XML_NAMESPACE,
    xmlns: XMLNS_NAMESPACE,
};
const XML_ENTITIES = {
    // eslint-disable-next-line @typescript-eslint/no-explicit-any
    __proto__: null,
    amp: "&",
    gt: ">",
    lt: "<",
    quot: "\"",
    apos: "'",
};
// EOC: end-of-chunk
const EOC = -1;
const NL_LIKE = -2;
const S_BEGIN = 0; // Initial state.
const S_BEGIN_WHITESPACE = 1; // leading whitespace
const S_DOCTYPE = 2; // <!DOCTYPE
const S_DOCTYPE_QUOTE = 3; // <!DOCTYPE "//blah
const S_DTD = 4; // <!DOCTYPE "//blah" [ ...
const S_DTD_QUOTED = 5; // <!DOCTYPE "//blah" [ "foo
const S_DTD_OPEN_WAKA = 6;
const S_DTD_OPEN_WAKA_BANG = 7;
const S_DTD_COMMENT = 8; // <!--
const S_DTD_COMMENT_ENDING = 9; // <!-- blah -
const S_DTD_COMMENT_ENDED = 10; // <!-- blah --
const S_DTD_PI = 11; // <?
const S_DTD_PI_ENDING = 12; // <?hi "there" ?
const S_TEXT = 13; // general stuff
const S_ENTITY = 14; // &amp and such
const S_OPEN_WAKA = 15; // <
const S_OPEN_WAKA_BANG = 16; // <!...
const S_COMMENT = 17; // <!--
const S_COMMENT_ENDING = 18; // <!-- blah -
const S_COMMENT_ENDED = 19; // <!-- blah --
const S_CDATA = 20; // <![CDATA[ something
const S_CDATA_ENDING = 21; // ]
const S_CDATA_ENDING_2 = 22; // ]]
const S_PI_FIRST_CHAR = 23; // <?hi, first char
const S_PI_REST = 24; // <?hi, rest of the name
const S_PI_BODY = 25; // <?hi there
const S_PI_ENDING = 26; // <?hi "there" ?
const S_XML_DECL_NAME_START = 27; // <?xml
const S_XML_DECL_NAME = 28; // <?xml foo
const S_XML_DECL_EQ = 29; // <?xml foo=
const S_XML_DECL_VALUE_START = 30; // <?xml foo=
const S_XML_DECL_VALUE = 31; // <?xml foo="bar"
const S_XML_DECL_SEPARATOR = 32; // <?xml foo="bar"
const S_XML_DECL_ENDING = 33; // <?xml ... ?
const S_OPEN_TAG = 34; // <strong
const S_OPEN_TAG_SLASH = 35; // <strong /
const S_ATTRIB = 36; // <a
const S_ATTRIB_NAME = 37; // <a foo
const S_ATTRIB_NAME_SAW_WHITE = 38; // <a foo _
const S_ATTRIB_VALUE = 39; // <a foo=
const S_ATTRIB_VALUE_QUOTED = 40; // <a foo="bar
const S_ATTRIB_VALUE_CLOSED = 41; // <a foo="bar"
const S_ATTRIB_VALUE_UNQUOTED = 42; // <a foo=bar
const S_CLOSE_TAG = 43; // </a
const S_CLOSE_TAG_SAW_WHITE = 44; // </a   >
const TAB = 9;
const NL = 0xA;
const CR = 0xD;
const SPACE = 0x20;
const BANG = 0x21;
const DQUOTE = 0x22;
const AMP = 0x26;
const SQUOTE = 0x27;
const MINUS = 0x2D;
const FORWARD_SLASH = 0x2F;
const SEMICOLON = 0x3B;
const LESS = 0x3C;
const EQUAL = 0x3D;
const GREATER = 0x3E;
const QUESTION = 0x3F;
const OPEN_BRACKET = 0x5B;
const CLOSE_BRACKET = 0x5D;
const NEL = 0x85;
const LS = 0x2028; // Line Separator
const isQuote = (c) => c === DQUOTE || c === SQUOTE;
const QUOTES = [DQUOTE, SQUOTE];
const DOCTYPE_TERMINATOR = [...QUOTES, OPEN_BRACKET, GREATER];
const DTD_TERMINATOR = [...QUOTES, LESS, CLOSE_BRACKET];
const XML_DECL_NAME_TERMINATOR = [EQUAL, QUESTION, ...S_LIST];
const ATTRIB_VALUE_UNQUOTED_TERMINATOR = [...S_LIST, GREATER, AMP, LESS];
function nsPairCheck(parser, prefix, uri) {
    switch (prefix) {
        case "xml":
            if (uri !== XML_NAMESPACE) {
                parser.fail(`xml prefix must be bound to ${XML_NAMESPACE}.`);
            }
            break;
        case "xmlns":
            if (uri !== XMLNS_NAMESPACE) {
                parser.fail(`xmlns prefix must be bound to ${XMLNS_NAMESPACE}.`);
            }
            break;
        default:
    }
    switch (uri) {
        case XMLNS_NAMESPACE:
            parser.fail(prefix === "" ?
                `the default namespace may not be set to ${uri}.` :
                `may not assign a prefix (even "xmlns") to the URI \
${XMLNS_NAMESPACE}.`);
            break;
        case XML_NAMESPACE:
            switch (prefix) {
                case "xml":
                    // Assinging the XML namespace to "xml" is fine.
                    break;
                case "":
                    parser.fail(`the default namespace may not be set to ${uri}.`);
                    break;
                default:
                    parser.fail("may not assign the xml namespace to another prefix.");
            }
            break;
        default:
    }
}
function nsMappingCheck(parser, mapping) {
    for (const local of Object.keys(mapping)) {
        nsPairCheck(parser, local, mapping[local]);
    }
}
const isNCName = (name) => NC_NAME_RE.test(name);
const isName = (name) => NAME_RE.test(name);
const FORBIDDEN_START = 0;
const FORBIDDEN_BRACKET = 1;
const FORBIDDEN_BRACKET_BRACKET = 2;
/**
 * The list of supported events.
 */
exports.EVENTS = [
    "xmldecl",
    "text",
    "processinginstruction",
    "doctype",
    "comment",
    "opentagstart",
    "attribute",
    "opentag",
    "closetag",
    "cdata",
    "error",
    "end",
    "ready",
];
const EVENT_NAME_TO_HANDLER_NAME = {
    xmldecl: "xmldeclHandler",
    text: "textHandler",
    processinginstruction: "piHandler",
    doctype: "doctypeHandler",
    comment: "commentHandler",
    opentagstart: "openTagStartHandler",
    attribute: "attributeHandler",
    opentag: "openTagHandler",
    closetag: "closeTagHandler",
    cdata: "cdataHandler",
    error: "errorHandler",
    end: "endHandler",
    ready: "readyHandler",
};
class SaxesParser {
    /**
     * @param opt The parser options.
     */
    constructor(opt) {
        this.opt = opt !== null && opt !== void 0 ? opt : {};
        this.fragmentOpt = !!this.opt.fragment;
        const xmlnsOpt = this.xmlnsOpt = !!this.opt.xmlns;
        this.trackPosition = this.opt.position !== false;
        this.fileName = this.opt.fileName;
        if (xmlnsOpt) {
            // This is the function we use to perform name checks on PIs and entities.
            // When namespaces are used, colons are not allowed in PI target names or
            // entity names. So the check depends on whether namespaces are used. See:
            //
            // https://www.w3.org/XML/xml-names-19990114-errata.html
            // NE08
            //
            this.nameStartCheck = isNCNameStartChar;
            this.nameCheck = isNCNameChar;
            this.isName = isNCName;
            // eslint-disable-next-line @typescript-eslint/unbound-method
            this.processAttribs = this.processAttribsNS;
            // eslint-disable-next-line @typescript-eslint/unbound-method
            this.pushAttrib = this.pushAttribNS;
            // eslint-disable-next-line @typescript-eslint/no-explicit-any
            this.ns = Object.assign({ __proto__: null }, rootNS);
            const additional = this.opt.additionalNamespaces;
            if (additional != null) {
                nsMappingCheck(this, additional);
                Object.assign(this.ns, additional);
            }
        }
        else {
            this.nameStartCheck = isNameStartChar;
            this.nameCheck = isNameChar;
            this.isName = isName;
            // eslint-disable-next-line @typescript-eslint/unbound-method
            this.processAttribs = this.processAttribsPlain;
            // eslint-disable-next-line @typescript-eslint/unbound-method
            this.pushAttrib = this.pushAttribPlain;
        }
        //
        // The order of the members in this table needs to correspond to the state
        // numbers given to the states that correspond to the methods being recorded
        // here.
        //
        this.stateTable = [
            /* eslint-disable @typescript-eslint/unbound-method */
            this.sBegin,
            this.sBeginWhitespace,
            this.sDoctype,
            this.sDoctypeQuote,
            this.sDTD,
            this.sDTDQuoted,
            this.sDTDOpenWaka,
            this.sDTDOpenWakaBang,
            this.sDTDComment,
            this.sDTDCommentEnding,
            this.sDTDCommentEnded,
            this.sDTDPI,
            this.sDTDPIEnding,
            this.sText,
            this.sEntity,
            this.sOpenWaka,
            this.sOpenWakaBang,
            this.sComment,
            this.sCommentEnding,
            this.sCommentEnded,
            this.sCData,
            this.sCDataEnding,
            this.sCDataEnding2,
            this.sPIFirstChar,
            this.sPIRest,
            this.sPIBody,
            this.sPIEnding,
            this.sXMLDeclNameStart,
            this.sXMLDeclName,
            this.sXMLDeclEq,
            this.sXMLDeclValueStart,
            this.sXMLDeclValue,
            this.sXMLDeclSeparator,
            this.sXMLDeclEnding,
            this.sOpenTag,
            this.sOpenTagSlash,
            this.sAttrib,
            this.sAttribName,
            this.sAttribNameSawWhite,
            this.sAttribValue,
            this.sAttribValueQuoted,
            this.sAttribValueClosed,
            this.sAttribValueUnquoted,
            this.sCloseTag,
            this.sCloseTagSawWhite,
        ];
        this._init();
    }
    /**
     * Indicates whether or not the parser is closed. If ``true``, wait for
     * the ``ready`` event to write again.
     */
    get closed() {
        return this._closed;
    }
    _init() {
        var _a;
        this.openWakaBang = "";
        this.text = "";
        this.name = "";
        this.piTarget = "";
        this.entity = "";
        this.q = null;
        this.tags = [];
        this.tag = null;
        this.topNS = null;
        this.chunk = "";
        this.chunkPosition = 0;
        this.i = 0;
        this.prevI = 0;
        this.carriedFromPrevious = undefined;
        this.forbiddenState = FORBIDDEN_START;
        this.attribList = [];
        // The logic is organized so as to minimize the need to check
        // this.opt.fragment while parsing.
        const { fragmentOpt } = this;
        this.state = fragmentOpt ? S_TEXT : S_BEGIN;
        // We want these to be all true if we are dealing with a fragment.
        this.reportedTextBeforeRoot = this.reportedTextAfterRoot = this.closedRoot =
            this.sawRoot = fragmentOpt;
        // An XML declaration is intially possible only when parsing whole
        // documents.
        this.xmlDeclPossible = !fragmentOpt;
        this.xmlDeclExpects = ["version"];
        this.entityReturnState = undefined;
        let { defaultXMLVersion } = this.opt;
        if (defaultXMLVersion === undefined) {
            if (this.opt.forceXMLVersion === true) {
                throw new Error("forceXMLVersion set but defaultXMLVersion is not set");
            }
            defaultXMLVersion = "1.0";
        }
        this.setXMLVersion(defaultXMLVersion);
        this.positionAtNewLine = 0;
        this.doctype = false;
        this._closed = false;
        this.xmlDecl = {
            version: undefined,
            encoding: undefined,
            standalone: undefined,
        };
        this.line = 1;
        this.column = 0;
        this.ENTITIES = Object.create(XML_ENTITIES);
        // eslint-disable-next-line no-unused-expressions
        (_a = this.readyHandler) === null || _a === void 0 ? void 0 : _a.call(this);
    }
    /**
     * The stream position the parser is currently looking at. This field is
     * zero-based.
     *
     * This field is not based on counting Unicode characters but is to be
     * interpreted as a plain index into a JavaScript string.
     */
    get position() {
        return this.chunkPosition + this.i;
    }
    /**
     * The column number of the next character to be read by the parser.  *
     * This field is zero-based. (The first column in a line is 0.)
     *
     * This field reports the index at which the next character would be in the
     * line if the line were represented as a JavaScript string.  Note that this
     * *can* be different to a count based on the number of *Unicode characters*
     * due to how JavaScript handles astral plane characters.
     *
     * See [[column]] for a number that corresponds to a count of Unicode
     * characters.
     */
    get columnIndex() {
        return this.position - this.positionAtNewLine;
    }
    /**
     * Set an event listener on an event. The parser supports one handler per
     * event type. If you try to set an event handler over an existing handler,
     * the old handler is silently overwritten.
     *
     * @param name The event to listen to.
     *
     * @param handler The handler to set.
     */
    on(name, handler) {
        // eslint-disable-next-line @typescript-eslint/no-explicit-any
        this[EVENT_NAME_TO_HANDLER_NAME[name]] = handler;
    }
    /**
     * Unset an event handler.
     *
     * @parma name The event to stop listening to.
     */
    off(name) {
        // eslint-disable-next-line @typescript-eslint/no-explicit-any
        this[EVENT_NAME_TO_HANDLER_NAME[name]] = undefined;
    }
    /**
     * Make an error object. The error object will have a message that contains
     * the ``fileName`` option passed at the creation of the parser. If position
     * tracking was turned on, it will also have line and column number
     * information.
     *
     * @param message The message describing the error to report.
     *
     * @returns An error object with a properly formatted message.
     */
    makeError(message) {
        var _a;
        let msg = (_a = this.fileName) !== null && _a !== void 0 ? _a : "";
        if (this.trackPosition) {
            if (msg.length > 0) {
                msg += ":";
            }
            msg += `${this.line}:${this.column}`;
        }
        if (msg.length > 0) {
            msg += ": ";
        }
        return new Error(msg + message);
    }
    /**
     * Report a parsing error. This method is made public so that client code may
     * check for issues that are outside the scope of this project and can report
     * errors.
     *
     * @param message The error to report.
     *
     * @returns this
     */
    fail(message) {
        const err = this.makeError(message);
        const handler = this.errorHandler;
        if (handler === undefined) {
            throw err;
        }
        else {
            handler(err);
        }
        return this;
    }
    /**
     * Write a XML data to the parser.
     *
     * @param chunk The XML data to write.
     *
     * @returns this
     */
    write(chunk) {
        if (this.closed) {
            return this.fail("cannot write after close; assign an onready handler.");
        }
        let end = false;
        if (chunk === null) {
            // We cannot return immediately because carriedFromPrevious may need
            // processing.
            end = true;
            chunk = "";
        }
        else if (typeof chunk === "object") {
            chunk = chunk.toString();
        }
        // We checked if performing a pre-decomposition of the string into an array
        // of single complete characters (``Array.from(chunk)``) would be faster
        // than the current repeated calls to ``charCodeAt``. As of August 2018, it
        // isn't. (There may be Node-specific code that would perform faster than
        // ``Array.from`` but don't want to be dependent on Node.)
        if (this.carriedFromPrevious !== undefined) {
            // The previous chunk had char we must carry over.
            chunk = `${this.carriedFromPrevious}${chunk}`;
            this.carriedFromPrevious = undefined;
        }
        let limit = chunk.length;
        const lastCode = chunk.charCodeAt(limit - 1);
        if (!end &&
            // A trailing CR or surrogate must be carried over to the next
            // chunk.
            (lastCode === CR || (lastCode >= 0xD800 && lastCode <= 0xDBFF))) {
            // The chunk ends with a character that must be carried over. We cannot
            // know how to handle it until we get the next chunk or the end of the
            // stream. So save it for later.
            this.carriedFromPrevious = chunk[limit - 1];
            limit--;
            chunk = chunk.slice(0, limit);
        }
        const { stateTable } = this;
        this.chunk = chunk;
        this.i = 0;
        while (this.i < limit) {
            // eslint-disable-next-line @typescript-eslint/no-explicit-any
            stateTable[this.state].call(this);
        }
        this.chunkPosition += limit;
        return end ? this.end() : this;
    }
    /**
     * Close the current stream. Perform final well-formedness checks and reset
     * the parser tstate.
     *
     * @returns this
     */
    close() {
        return this.write(null);
    }
    /**
     * Get a single code point out of the current chunk. This updates the current
     * position if we do position tracking.
     *
     * This is the algorithm to use for XML 1.0.
     *
     * @returns The character read.
     */
    getCode10() {
        const { chunk, i } = this;
        this.prevI = i;
        // Yes, we do this instead of doing this.i++. Doing it this way, we do not
        // read this.i again, which is a bit faster.
        this.i = i + 1;
        if (i >= chunk.length) {
            return EOC;
        }
        // Using charCodeAt and handling the surrogates ourselves is faster
        // than using codePointAt.
        const code = chunk.charCodeAt(i);
        this.column++;
        if (code < 0xD800) {
            if (code >= SPACE || code === TAB) {
                return code;
            }
            switch (code) {
                case NL:
                    this.line++;
                    this.column = 0;
                    this.positionAtNewLine = this.position;
                    return NL;
                case CR:
                    // We may get NaN if we read past the end of the chunk, which is fine.
                    if (chunk.charCodeAt(i + 1) === NL) {
                        // A \r\n sequence is converted to \n so we have to skip over the
                        // next character. We already know it has a size of 1 so ++ is fine
                        // here.
                        this.i = i + 2;
                    }
                    // Otherwise, a \r is just converted to \n, so we don't have to skip
                    // ahead.
                    // In either case, \r becomes \n.
                    this.line++;
                    this.column = 0;
                    this.positionAtNewLine = this.position;
                    return NL_LIKE;
                default:
                    // If we get here, then code < SPACE and it is not NL CR or TAB.
                    this.fail("disallowed character.");
                    return code;
            }
        }
        if (code > 0xDBFF) {
            // This is a specialized version of isChar10 that takes into account
            // that in this context code > 0xDBFF and code <= 0xFFFF. So it does not
            // test cases that don't need testing.
            if (!(code >= 0xE000 && code <= 0xFFFD)) {
                this.fail("disallowed character.");
            }
            return code;
        }
        const final = 0x10000 + ((code - 0xD800) * 0x400) +
            (chunk.charCodeAt(i + 1) - 0xDC00);
        this.i = i + 2;
        // This is a specialized version of isChar10 that takes into account that in
        // this context necessarily final >= 0x10000.
        if (final > 0x10FFFF) {
            this.fail("disallowed character.");
        }
        return final;
    }
    /**
     * Get a single code point out of the current chunk. This updates the current
     * position if we do position tracking.
     *
     * This is the algorithm to use for XML 1.1.
     *
     * @returns {number} The character read.
     */
    getCode11() {
        const { chunk, i } = this;
        this.prevI = i;
        // Yes, we do this instead of doing this.i++. Doing it this way, we do not
        // read this.i again, which is a bit faster.
        this.i = i + 1;
        if (i >= chunk.length) {
            return EOC;
        }
        // Using charCodeAt and handling the surrogates ourselves is faster
        // than using codePointAt.
        const code = chunk.charCodeAt(i);
        this.column++;
        if (code < 0xD800) {
            if ((code > 0x1F && code < 0x7F) || (code > 0x9F && code !== LS) ||
                code === TAB) {
                return code;
            }
            switch (code) {
                case NL: // 0xA
                    this.line++;
                    this.column = 0;
                    this.positionAtNewLine = this.position;
                    return NL;
                case CR: { // 0xD
                    // We may get NaN if we read past the end of the chunk, which is
                    // fine.
                    const next = chunk.charCodeAt(i + 1);
                    if (next === NL || next === NEL) {
                        // A CR NL or CR NEL sequence is converted to NL so we have to skip
                        // over the next character. We already know it has a size of 1.
                        this.i = i + 2;
                    }
                    // Otherwise, a CR is just converted to NL, no skip.
                }
                /* yes, fall through */
                case NEL: // 0x85
                case LS: // Ox2028
                    this.line++;
                    this.column = 0;
                    this.positionAtNewLine = this.position;
                    return NL_LIKE;
                default:
                    this.fail("disallowed character.");
                    return code;
            }
        }
        if (code > 0xDBFF) {
            // This is a specialized version of isCharAndNotRestricted that takes into
            // account that in this context code > 0xDBFF and code <= 0xFFFF. So it
            // does not test cases that don't need testing.
            if (!(code >= 0xE000 && code <= 0xFFFD)) {
                this.fail("disallowed character.");
            }
            return code;
        }
        const final = 0x10000 + ((code - 0xD800) * 0x400) +
            (chunk.charCodeAt(i + 1) - 0xDC00);
        this.i = i + 2;
        // This is a specialized version of isCharAndNotRestricted that takes into
        // account that in this context necessarily final >= 0x10000.
        if (final > 0x10FFFF) {
            this.fail("disallowed character.");
        }
        return final;
    }
    /**
     * Like ``getCode`` but with the return value normalized so that ``NL`` is
     * returned for ``NL_LIKE``.
     */
    getCodeNorm() {
        const c = this.getCode();
        return c === NL_LIKE ? NL : c;
    }
    unget() {
        this.i = this.prevI;
        this.column--;
    }
    /**
     * Capture characters into a buffer until encountering one of a set of
     * characters.
     *
     * @param chars An array of codepoints. Encountering a character in the array
     * ends the capture. (``chars`` may safely contain ``NL``.)
     *
     * @return The character code that made the capture end, or ``EOC`` if we hit
     * the end of the chunk. The return value cannot be NL_LIKE: NL is returned
     * instead.
     */
    captureTo(chars) {
        let { i: start } = this;
        const { chunk } = this;
        // eslint-disable-next-line no-constant-condition
        while (true) {
            const c = this.getCode();
            const isNLLike = c === NL_LIKE;
            const final = isNLLike ? NL : c;
            if (final === EOC || chars.includes(final)) {
                this.text += chunk.slice(start, this.prevI);
                return final;
            }
            if (isNLLike) {
                this.text += `${chunk.slice(start, this.prevI)}\n`;
                start = this.i;
            }
        }
    }
    /**
     * Capture characters into a buffer until encountering a character.
     *
     * @param char The codepoint that ends the capture. **NOTE ``char`` MAY NOT
     * CONTAIN ``NL``.** Passing ``NL`` will result in buggy behavior.
     *
     * @return ``true`` if we ran into the character. Otherwise, we ran into the
     * end of the current chunk.
     */
    captureToChar(char) {
        let { i: start } = this;
        const { chunk } = this;
        // eslint-disable-next-line no-constant-condition
        while (true) {
            let c = this.getCode();
            switch (c) {
                case NL_LIKE:
                    this.text += `${chunk.slice(start, this.prevI)}\n`;
                    start = this.i;
                    c = NL;
                    break;
                case EOC:
                    this.text += chunk.slice(start);
                    return false;
                default:
            }
            if (c === char) {
                this.text += chunk.slice(start, this.prevI);
                return true;
            }
        }
    }
    /**
     * Capture characters that satisfy ``isNameChar`` into the ``name`` field of
     * this parser.
     *
     * @return The character code that made the test fail, or ``EOC`` if we hit
     * the end of the chunk. The return value cannot be NL_LIKE: NL is returned
     * instead.
     */
    captureNameChars() {
        const { chunk, i: start } = this;
        // eslint-disable-next-line no-constant-condition
        while (true) {
            const c = this.getCode();
            if (c === EOC) {
                this.name += chunk.slice(start);
                return EOC;
            }
            // NL is not a name char so we don't have to test specifically for it.
            if (!isNameChar(c)) {
                this.name += chunk.slice(start, this.prevI);
                return c === NL_LIKE ? NL : c;
            }
        }
    }
    /**
     * Skip white spaces.
     *
     * @return The character that ended the skip, or ``EOC`` if we hit
     * the end of the chunk. The return value cannot be NL_LIKE: NL is returned
     * instead.
     */
    skipSpaces() {
        // eslint-disable-next-line no-constant-condition
        while (true) {
            const c = this.getCodeNorm();
            if (c === EOC || !isS(c)) {
                return c;
            }
        }
    }
    setXMLVersion(version) {
        this.currentXMLVersion = version;
        /*  eslint-disable @typescript-eslint/unbound-method */
        if (version === "1.0") {
            this.isChar = isChar10;
            this.getCode = this.getCode10;
        }
        else {
            this.isChar = isChar11;
            this.getCode = this.getCode11;
        }
        /* eslint-enable @typescript-eslint/unbound-method */
    }
    // STATE ENGINE METHODS
    // This needs to be a state separate from S_BEGIN_WHITESPACE because we want
    // to be sure never to come back to this state later.
    sBegin() {
        // We are essentially peeking at the first character of the chunk. Since
        // S_BEGIN can be in effect only when we start working on the first chunk,
        // the index at which we must look is necessarily 0. Note also that the
        // following test does not depend on decoding surrogates.
        // If the initial character is 0xFEFF, ignore it.
        if (this.chunk.charCodeAt(0) === 0xFEFF) {
            this.i++;
            this.column++;
        }
        this.state = S_BEGIN_WHITESPACE;
    }
    sBeginWhitespace() {
        // We need to know whether we've encountered spaces or not because as soon
        // as we run into a space, an XML declaration is no longer possible. Rather
        // than slow down skipSpaces even in places where we don't care whether it
        // skipped anything or not, we check whether prevI is equal to the value of
        // i from before we skip spaces.
        const iBefore = this.i;
        const c = this.skipSpaces();
        if (this.prevI !== iBefore) {
            this.xmlDeclPossible = false;
        }
        switch (c) {
            case LESS:
                this.state = S_OPEN_WAKA;
                // We could naively call closeText but in this state, it is not normal
                // to have text be filled with any data.
                if (this.text.length !== 0) {
                    throw new Error("no-empty text at start");
                }
                break;
            case EOC:
                break;
            default:
                this.unget();
                this.state = S_TEXT;
                this.xmlDeclPossible = false;
        }
    }
    sDoctype() {
        var _a;
        const c = this.captureTo(DOCTYPE_TERMINATOR);
        switch (c) {
            case GREATER: {
                // eslint-disable-next-line no-unused-expressions
                (_a = this.doctypeHandler) === null || _a === void 0 ? void 0 : _a.call(this, this.text);
                this.text = "";
                this.state = S_TEXT;
                this.doctype = true; // just remember that we saw it.
                break;
            }
            case EOC:
                break;
            default:
                this.text += String.fromCodePoint(c);
                if (c === OPEN_BRACKET) {
                    this.state = S_DTD;
                }
                else if (isQuote(c)) {
                    this.state = S_DOCTYPE_QUOTE;
                    this.q = c;
                }
        }
    }
    sDoctypeQuote() {
        const q = this.q;
        if (this.captureToChar(q)) {
            this.text += String.fromCodePoint(q);
            this.q = null;
            this.state = S_DOCTYPE;
        }
    }
    sDTD() {
        const c = this.captureTo(DTD_TERMINATOR);
        if (c === EOC) {
            return;
        }
        this.text += String.fromCodePoint(c);
        if (c === CLOSE_BRACKET) {
            this.state = S_DOCTYPE;
        }
        else if (c === LESS) {
            this.state = S_DTD_OPEN_WAKA;
        }
        else if (isQuote(c)) {
            this.state = S_DTD_QUOTED;
            this.q = c;
        }
    }
    sDTDQuoted() {
        const q = this.q;
        if (this.captureToChar(q)) {
            this.text += String.fromCodePoint(q);
            this.state = S_DTD;
            this.q = null;
        }
    }
    sDTDOpenWaka() {
        const c = this.getCodeNorm();
        this.text += String.fromCodePoint(c);
        switch (c) {
            case BANG:
                this.state = S_DTD_OPEN_WAKA_BANG;
                this.openWakaBang = "";
                break;
            case QUESTION:
                this.state = S_DTD_PI;
                break;
            default:
                this.state = S_DTD;
        }
    }
    sDTDOpenWakaBang() {
        const char = String.fromCodePoint(this.getCodeNorm());
        const owb = this.openWakaBang += char;
        this.text += char;
        if (owb !== "-") {
            this.state = owb === "--" ? S_DTD_COMMENT : S_DTD;
            this.openWakaBang = "";
        }
    }
    sDTDComment() {
        if (this.captureToChar(MINUS)) {
            this.text += "-";
            this.state = S_DTD_COMMENT_ENDING;
        }
    }
    sDTDCommentEnding() {
        const c = this.getCodeNorm();
        this.text += String.fromCodePoint(c);
        this.state = c === MINUS ? S_DTD_COMMENT_ENDED : S_DTD_COMMENT;
    }
    sDTDCommentEnded() {
        const c = this.getCodeNorm();
        this.text += String.fromCodePoint(c);
        if (c === GREATER) {
            this.state = S_DTD;
        }
        else {
            this.fail("malformed comment.");
            // <!-- blah -- bloo --> will be recorded as
            // a comment of " blah -- bloo "
            this.state = S_DTD_COMMENT;
        }
    }
    sDTDPI() {
        if (this.captureToChar(QUESTION)) {
            this.text += "?";
            this.state = S_DTD_PI_ENDING;
        }
    }
    sDTDPIEnding() {
        const c = this.getCodeNorm();
        this.text += String.fromCodePoint(c);
        if (c === GREATER) {
            this.state = S_DTD;
        }
    }
    sText() {
        //
        // We did try a version of saxes where the S_TEXT state was split in two
        // states: one for text inside the root element, and one for text
        // outside. This was avoiding having to test this.tags.length to decide
        // what implementation to actually use.
        //
        // Peformance testing on gigabyte-size files did not show any advantage to
        // using the two states solution instead of the current one. Conversely, it
        // made the code a bit more complicated elsewhere. For instance, a comment
        // can appear before the root element so when a comment ended it was
        // necessary to determine whether to return to the S_TEXT state or to the
        // new text-outside-root state.
        //
        if (this.tags.length !== 0) {
            this.handleTextInRoot();
        }
        else {
            this.handleTextOutsideRoot();
        }
    }
    sEntity() {
        // This is essentially a specialized version of captureToChar(SEMICOLON...)
        let { i: start } = this;
        const { chunk } = this;
        // eslint-disable-next-line no-labels, no-restricted-syntax
        loop: 
        // eslint-disable-next-line no-constant-condition
        while (true) {
            switch (this.getCode()) {
                case NL_LIKE:
                    this.entity += `${chunk.slice(start, this.prevI)}\n`;
                    start = this.i;
                    break;
                case SEMICOLON: {
                    const { entityReturnState } = this;
                    const entity = this.entity + chunk.slice(start, this.prevI);
                    this.state = entityReturnState;
                    let parsed;
                    if (entity === "") {
                        this.fail("empty entity name.");
                        parsed = "&;";
                    }
                    else {
                        parsed = this.parseEntity(entity);
                        this.entity = "";
                    }
                    if (entityReturnState !== S_TEXT || this.textHandler !== undefined) {
                        this.text += parsed;
                    }
                    // eslint-disable-next-line no-labels
                    break loop;
                }
                case EOC:
                    this.entity += chunk.slice(start);
                    // eslint-disable-next-line no-labels
                    break loop;
                default:
            }
        }
    }
    sOpenWaka() {
        // Reminder: a state handler is called with at least one character
        // available in the current chunk. So the first call to get code inside of
        // a state handler cannot return ``EOC``. That's why we don't test
        // for it.
        const c = this.getCode();
        // either a /, ?, !, or text is coming next.
        if (isNameStartChar(c)) {
            this.state = S_OPEN_TAG;
            this.unget();
            this.xmlDeclPossible = false;
        }
        else {
            switch (c) {
                case FORWARD_SLASH:
                    this.state = S_CLOSE_TAG;
                    this.xmlDeclPossible = false;
                    break;
                case BANG:
                    this.state = S_OPEN_WAKA_BANG;
                    this.openWakaBang = "";
                    this.xmlDeclPossible = false;
                    break;
                case QUESTION:
                    this.state = S_PI_FIRST_CHAR;
                    break;
                default:
                    this.fail("disallowed character in tag name");
                    this.state = S_TEXT;
                    this.xmlDeclPossible = false;
            }
        }
    }
    sOpenWakaBang() {
        this.openWakaBang += String.fromCodePoint(this.getCodeNorm());
        switch (this.openWakaBang) {
            case "[CDATA[":
                if (!this.sawRoot && !this.reportedTextBeforeRoot) {
                    this.fail("text data outside of root node.");
                    this.reportedTextBeforeRoot = true;
                }
                if (this.closedRoot && !this.reportedTextAfterRoot) {
                    this.fail("text data outside of root node.");
                    this.reportedTextAfterRoot = true;
                }
                this.state = S_CDATA;
                this.openWakaBang = "";
                break;
            case "--":
                this.state = S_COMMENT;
                this.openWakaBang = "";
                break;
            case "DOCTYPE":
                this.state = S_DOCTYPE;
                if (this.doctype || this.sawRoot) {
                    this.fail("inappropriately located doctype declaration.");
                }
                this.openWakaBang = "";
                break;
            default:
                // 7 happens to be the maximum length of the string that can possibly
                // match one of the cases above.
                if (this.openWakaBang.length >= 7) {
                    this.fail("incorrect syntax.");
                }
        }
    }
    sComment() {
        if (this.captureToChar(MINUS)) {
            this.state = S_COMMENT_ENDING;
        }
    }
    sCommentEnding() {
        var _a;
        const c = this.getCodeNorm();
        if (c === MINUS) {
            this.state = S_COMMENT_ENDED;
            // eslint-disable-next-line no-unused-expressions
            (_a = this.commentHandler) === null || _a === void 0 ? void 0 : _a.call(this, this.text);
            this.text = "";
        }
        else {
            this.text += `-${String.fromCodePoint(c)}`;
            this.state = S_COMMENT;
        }
    }
    sCommentEnded() {
        const c = this.getCodeNorm();
        if (c !== GREATER) {
            this.fail("malformed comment.");
            // <!-- blah -- bloo --> will be recorded as
            // a comment of " blah -- bloo "
            this.text += `--${String.fromCodePoint(c)}`;
            this.state = S_COMMENT;
        }
        else {
            this.state = S_TEXT;
        }
    }
    sCData() {
        if (this.captureToChar(CLOSE_BRACKET)) {
            this.state = S_CDATA_ENDING;
        }
    }
    sCDataEnding() {
        const c = this.getCodeNorm();
        if (c === CLOSE_BRACKET) {
            this.state = S_CDATA_ENDING_2;
        }
        else {
            this.text += `]${String.fromCodePoint(c)}`;
            this.state = S_CDATA;
        }
    }
    sCDataEnding2() {
        var _a;
        const c = this.getCodeNorm();
        switch (c) {
            case GREATER: {
                // eslint-disable-next-line no-unused-expressions
                (_a = this.cdataHandler) === null || _a === void 0 ? void 0 : _a.call(this, this.text);
                this.text = "";
                this.state = S_TEXT;
                break;
            }
            case CLOSE_BRACKET:
                this.text += "]";
                break;
            default:
                this.text += `]]${String.fromCodePoint(c)}`;
                this.state = S_CDATA;
        }
    }
    // We need this separate state to check the first character fo the pi target
    // with this.nameStartCheck which allows less characters than this.nameCheck.
    sPIFirstChar() {
        const c = this.getCodeNorm();
        // This is first because in the case where the file is well-formed this is
        // the branch taken. We optimize for well-formedness.
        if (this.nameStartCheck(c)) {
            this.piTarget += String.fromCodePoint(c);
            this.state = S_PI_REST;
        }
        else if (c === QUESTION || isS(c)) {
            this.fail("processing instruction without a target.");
            this.state = c === QUESTION ? S_PI_ENDING : S_PI_BODY;
        }
        else {
            this.fail("disallowed character in processing instruction name.");
            this.piTarget += String.fromCodePoint(c);
            this.state = S_PI_REST;
        }
    }
    sPIRest() {
        // Capture characters into a piTarget while ``this.nameCheck`` run on the
        // character read returns true.
        const { chunk, i: start } = this;
        // eslint-disable-next-line no-constant-condition
        while (true) {
            const c = this.getCodeNorm();
            if (c === EOC) {
                this.piTarget += chunk.slice(start);
                return;
            }
            // NL cannot satisfy this.nameCheck so we don't have to test specifically
            // for it.
            if (!this.nameCheck(c)) {
                this.piTarget += chunk.slice(start, this.prevI);
                const isQuestion = c === QUESTION;
                if (isQuestion || isS(c)) {
                    if (this.piTarget === "xml") {
                        if (!this.xmlDeclPossible) {
                            this.fail("an XML declaration must be at the start of the document.");
                        }
                        this.state = isQuestion ? S_XML_DECL_ENDING : S_XML_DECL_NAME_START;
                    }
                    else {
                        this.state = isQuestion ? S_PI_ENDING : S_PI_BODY;
                    }
                }
                else {
                    this.fail("disallowed character in processing instruction name.");
                    this.piTarget += String.fromCodePoint(c);
                }
                break;
            }
        }
    }
    sPIBody() {
        if (this.text.length === 0) {
            const c = this.getCodeNorm();
            if (c === QUESTION) {
                this.state = S_PI_ENDING;
            }
            else if (!isS(c)) {
                this.text = String.fromCodePoint(c);
            }
        }
        // The question mark character is not valid inside any of the XML
        // declaration name/value pairs.
        else if (this.captureToChar(QUESTION)) {
            this.state = S_PI_ENDING;
        }
    }
    sPIEnding() {
        var _a;
        const c = this.getCodeNorm();
        if (c === GREATER) {
            const { piTarget } = this;
            if (piTarget.toLowerCase() === "xml") {
                this.fail("the XML declaration must appear at the start of the document.");
            }
            // eslint-disable-next-line no-unused-expressions
            (_a = this.piHandler) === null || _a === void 0 ? void 0 : _a.call(this, {
                target: piTarget,
                body: this.text,
            });
            this.piTarget = this.text = "";
            this.state = S_TEXT;
        }
        else if (c === QUESTION) {
            // We ran into ?? as part of a processing instruction. We initially took
            // the first ? as a sign that the PI was ending, but it is not. So we have
            // to add it to the body but we take the new ? as a sign that the PI is
            // ending.
            this.text += "?";
        }
        else {
            this.text += `?${String.fromCodePoint(c)}`;
            this.state = S_PI_BODY;
        }
        this.xmlDeclPossible = false;
    }
    sXMLDeclNameStart() {
        const c = this.skipSpaces();
        // The question mark character is not valid inside any of the XML
        // declaration name/value pairs.
        if (c === QUESTION) {
            // It is valid to go to S_XML_DECL_ENDING from this state.
            this.state = S_XML_DECL_ENDING;
            return;
        }
        if (c !== EOC) {
            this.state = S_XML_DECL_NAME;
            this.name = String.fromCodePoint(c);
        }
    }
    sXMLDeclName() {
        const c = this.captureTo(XML_DECL_NAME_TERMINATOR);
        // The question mark character is not valid inside any of the XML
        // declaration name/value pairs.
        if (c === QUESTION) {
            this.state = S_XML_DECL_ENDING;
            this.name += this.text;
            this.text = "";
            this.fail("XML declaration is incomplete.");
            return;
        }
        if (!(isS(c) || c === EQUAL)) {
            return;
        }
        this.name += this.text;
        this.text = "";
        if (!this.xmlDeclExpects.includes(this.name)) {
            switch (this.name.length) {
                case 0:
                    this.fail("did not expect any more name/value pairs.");
                    break;
                case 1:
                    this.fail(`expected the name ${this.xmlDeclExpects[0]}.`);
                    break;
                default:
                    this.fail(`expected one of ${this.xmlDeclExpects.join(", ")}`);
            }
        }
        this.state = c === EQUAL ? S_XML_DECL_VALUE_START : S_XML_DECL_EQ;
    }
    sXMLDeclEq() {
        const c = this.getCodeNorm();
        // The question mark character is not valid inside any of the XML
        // declaration name/value pairs.
        if (c === QUESTION) {
            this.state = S_XML_DECL_ENDING;
            this.fail("XML declaration is incomplete.");
            return;
        }
        if (isS(c)) {
            return;
        }
        if (c !== EQUAL) {
            this.fail("value required.");
        }
        this.state = S_XML_DECL_VALUE_START;
    }
    sXMLDeclValueStart() {
        const c = this.getCodeNorm();
        // The question mark character is not valid inside any of the XML
        // declaration name/value pairs.
        if (c === QUESTION) {
            this.state = S_XML_DECL_ENDING;
            this.fail("XML declaration is incomplete.");
            return;
        }
        if (isS(c)) {
            return;
        }
        if (!isQuote(c)) {
            this.fail("value must be quoted.");
            this.q = SPACE;
        }
        else {
            this.q = c;
        }
        this.state = S_XML_DECL_VALUE;
    }
    sXMLDeclValue() {
        const c = this.captureTo([this.q, QUESTION]);
        // The question mark character is not valid inside any of the XML
        // declaration name/value pairs.
        if (c === QUESTION) {
            this.state = S_XML_DECL_ENDING;
            this.text = "";
            this.fail("XML declaration is incomplete.");
            return;
        }
        if (c === EOC) {
            return;
        }
        const value = this.text;
        this.text = "";
        switch (this.name) {
            case "version": {
                this.xmlDeclExpects = ["encoding", "standalone"];
                const version = value;
                this.xmlDecl.version = version;
                // This is the test specified by XML 1.0 but it is fine for XML 1.1.
                if (!/^1\.[0-9]+$/.test(version)) {
                    this.fail("version number must match /^1\\.[0-9]+$/.");
                }
                // When forceXMLVersion is set, the XML declaration is ignored.
                else if (!this.opt.forceXMLVersion) {
                    this.setXMLVersion(version);
                }
                break;
            }
            case "encoding":
                if (!/^[A-Za-z][A-Za-z0-9._-]*$/.test(value)) {
                    this.fail("encoding value must match \
/^[A-Za-z0-9][A-Za-z0-9._-]*$/.");
                }
                this.xmlDeclExpects = ["standalone"];
                this.xmlDecl.encoding = value;
                break;
            case "standalone":
                if (value !== "yes" && value !== "no") {
                    this.fail("standalone value must match \"yes\" or \"no\".");
                }
                this.xmlDeclExpects = [];
                this.xmlDecl.standalone = value;
                break;
            default:
            // We don't need to raise an error here since we've already raised one
            // when checking what name was expected.
        }
        this.name = "";
        this.state = S_XML_DECL_SEPARATOR;
    }
    sXMLDeclSeparator() {
        const c = this.getCodeNorm();
        // The question mark character is not valid inside any of the XML
        // declaration name/value pairs.
        if (c === QUESTION) {
            // It is valid to go to S_XML_DECL_ENDING from this state.
            this.state = S_XML_DECL_ENDING;
            return;
        }
        if (!isS(c)) {
            this.fail("whitespace required.");
            this.unget();
        }
        this.state = S_XML_DECL_NAME_START;
    }
    sXMLDeclEnding() {
        var _a;
        const c = this.getCodeNorm();
        if (c === GREATER) {
            if (this.piTarget !== "xml") {
                this.fail("processing instructions are not allowed before root.");
            }
            else if (this.name !== "version" &&
                this.xmlDeclExpects.includes("version")) {
                this.fail("XML declaration must contain a version.");
            }
            // eslint-disable-next-line no-unused-expressions
            (_a = this.xmldeclHandler) === null || _a === void 0 ? void 0 : _a.call(this, this.xmlDecl);
            this.name = "";
            this.piTarget = this.text = "";
            this.state = S_TEXT;
        }
        else {
            // We got here because the previous character was a ?, but the question
            // mark character is not valid inside any of the XML declaration
            // name/value pairs.
            this.fail("The character ? is disallowed anywhere in XML declarations.");
        }
        this.xmlDeclPossible = false;
    }
    sOpenTag() {
        var _a;
        const c = this.captureNameChars();
        if (c === EOC) {
            return;
        }
        const tag = this.tag = {
            name: this.name,
            attributes: Object.create(null),
        };
        this.name = "";
        if (this.xmlnsOpt) {
            this.topNS = tag.ns = Object.create(null);
        }
        // eslint-disable-next-line no-unused-expressions
        (_a = this.openTagStartHandler) === null || _a === void 0 ? void 0 : _a.call(this, tag);
        this.sawRoot = true;
        if (!this.fragmentOpt && this.closedRoot) {
            this.fail("documents may contain only one root.");
        }
        switch (c) {
            case GREATER:
                this.openTag();
                break;
            case FORWARD_SLASH:
                this.state = S_OPEN_TAG_SLASH;
                break;
            default:
                if (!isS(c)) {
                    this.fail("disallowed character in tag name.");
                }
                this.state = S_ATTRIB;
        }
    }
    sOpenTagSlash() {
        if (this.getCode() === GREATER) {
            this.openSelfClosingTag();
        }
        else {
            this.fail("forward-slash in opening tag not followed by >.");
            this.state = S_ATTRIB;
        }
    }
    sAttrib() {
        const c = this.skipSpaces();
        if (c === EOC) {
            return;
        }
        if (isNameStartChar(c)) {
            this.unget();
            this.state = S_ATTRIB_NAME;
        }
        else if (c === GREATER) {
            this.openTag();
        }
        else if (c === FORWARD_SLASH) {
            this.state = S_OPEN_TAG_SLASH;
        }
        else {
            this.fail("disallowed character in attribute name.");
        }
    }
    sAttribName() {
        const c = this.captureNameChars();
        if (c === EQUAL) {
            this.state = S_ATTRIB_VALUE;
        }
        else if (isS(c)) {
            this.state = S_ATTRIB_NAME_SAW_WHITE;
        }
        else if (c === GREATER) {
            this.fail("attribute without value.");
            this.pushAttrib(this.name, this.name);
            this.name = this.text = "";
            this.openTag();
        }
        else if (c !== EOC) {
            this.fail("disallowed character in attribute name.");
        }
    }
    sAttribNameSawWhite() {
        const c = this.skipSpaces();
        switch (c) {
            case EOC:
                return;
            case EQUAL:
                this.state = S_ATTRIB_VALUE;
                break;
            default:
                this.fail("attribute without value.");
                // Should we do this???
                // this.tag.attributes[this.name] = "";
                this.text = "";
                this.name = "";
                if (c === GREATER) {
                    this.openTag();
                }
                else if (isNameStartChar(c)) {
                    this.unget();
                    this.state = S_ATTRIB_NAME;
                }
                else {
                    this.fail("disallowed character in attribute name.");
                    this.state = S_ATTRIB;
                }
        }
    }
    sAttribValue() {
        const c = this.getCodeNorm();
        if (isQuote(c)) {
            this.q = c;
            this.state = S_ATTRIB_VALUE_QUOTED;
        }
        else if (!isS(c)) {
            this.fail("unquoted attribute value.");
            this.state = S_ATTRIB_VALUE_UNQUOTED;
            this.unget();
        }
    }
    sAttribValueQuoted() {
        // We deliberately do not use captureTo here. The specialized code we use
        // here is faster than using captureTo.
        const { q, chunk } = this;
        let { i: start } = this;
        // eslint-disable-next-line no-constant-condition
        while (true) {
            switch (this.getCode()) {
                case q:
                    this.pushAttrib(this.name, this.text + chunk.slice(start, this.prevI));
                    this.name = this.text = "";
                    this.q = null;
                    this.state = S_ATTRIB_VALUE_CLOSED;
                    return;
                case AMP:
                    this.text += chunk.slice(start, this.prevI);
                    this.state = S_ENTITY;
                    this.entityReturnState = S_ATTRIB_VALUE_QUOTED;
                    return;
                case NL:
                case NL_LIKE:
                case TAB:
                    this.text += `${chunk.slice(start, this.prevI)} `;
                    start = this.i;
                    break;
                case LESS:
                    this.text += chunk.slice(start, this.prevI);
                    this.fail("disallowed character.");
                    return;
                case EOC:
                    this.text += chunk.slice(start);
                    return;
                default:
            }
        }
    }
    sAttribValueClosed() {
        const c = this.getCodeNorm();
        if (isS(c)) {
            this.state = S_ATTRIB;
        }
        else if (c === GREATER) {
            this.openTag();
        }
        else if (c === FORWARD_SLASH) {
            this.state = S_OPEN_TAG_SLASH;
        }
        else if (isNameStartChar(c)) {
            this.fail("no whitespace between attributes.");
            this.unget();
            this.state = S_ATTRIB_NAME;
        }
        else {
            this.fail("disallowed character in attribute name.");
        }
    }
    sAttribValueUnquoted() {
        // We don't do anything regarding EOL or space handling for unquoted
        // attributes. We already have failed by the time we get here, and the
        // contract that saxes upholds states that upon failure, it is not safe to
        // rely on the data passed to event handlers (other than
        // ``onerror``). Passing "bad" data is not a problem.
        const c = this.captureTo(ATTRIB_VALUE_UNQUOTED_TERMINATOR);
        switch (c) {
            case AMP:
                this.state = S_ENTITY;
                this.entityReturnState = S_ATTRIB_VALUE_UNQUOTED;
                break;
            case LESS:
                this.fail("disallowed character.");
                break;
            case EOC:
                break;
            default:
                if (this.text.includes("]]>")) {
                    this.fail("the string \"]]>\" is disallowed in char data.");
                }
                this.pushAttrib(this.name, this.text);
                this.name = this.text = "";
                if (c === GREATER) {
                    this.openTag();
                }
                else {
                    this.state = S_ATTRIB;
                }
        }
    }
    sCloseTag() {
        const c = this.captureNameChars();
        if (c === GREATER) {
            this.closeTag();
        }
        else if (isS(c)) {
            this.state = S_CLOSE_TAG_SAW_WHITE;
        }
        else if (c !== EOC) {
            this.fail("disallowed character in closing tag.");
        }
    }
    sCloseTagSawWhite() {
        switch (this.skipSpaces()) {
            case GREATER:
                this.closeTag();
                break;
            case EOC:
                break;
            default:
                this.fail("disallowed character in closing tag.");
        }
    }
    // END OF STATE ENGINE METHODS
    handleTextInRoot() {
        // This is essentially a specialized version of captureTo which is optimized
        // for performing the ]]> check. A previous version of this code, checked
        // ``this.text`` for the presence of ]]>. It simplified the code but was
        // very costly when character data contained a lot of entities to be parsed.
        //
        // Since we are using a specialized loop, we also keep track of the presence
        // of ]]> in text data. The sequence ]]> is forbidden to appear as-is.
        //
        let { i: start, forbiddenState } = this;
        const { chunk, textHandler: handler } = this;
        // eslint-disable-next-line no-labels, no-restricted-syntax
        scanLoop: 
        // eslint-disable-next-line no-constant-condition
        while (true) {
            switch (this.getCode()) {
                case LESS: {
                    this.state = S_OPEN_WAKA;
                    if (handler !== undefined) {
                        const { text } = this;
                        const slice = chunk.slice(start, this.prevI);
                        if (text.length !== 0) {
                            handler(text + slice);
                            this.text = "";
                        }
                        else if (slice.length !== 0) {
                            handler(slice);
                        }
                    }
                    forbiddenState = FORBIDDEN_START;
                    // eslint-disable-next-line no-labels
                    break scanLoop;
                }
                case AMP:
                    this.state = S_ENTITY;
                    this.entityReturnState = S_TEXT;
                    if (handler !== undefined) {
                        this.text += chunk.slice(start, this.prevI);
                    }
                    forbiddenState = FORBIDDEN_START;
                    // eslint-disable-next-line no-labels
                    break scanLoop;
                case CLOSE_BRACKET:
                    switch (forbiddenState) {
                        case FORBIDDEN_START:
                            forbiddenState = FORBIDDEN_BRACKET;
                            break;
                        case FORBIDDEN_BRACKET:
                            forbiddenState = FORBIDDEN_BRACKET_BRACKET;
                            break;
                        case FORBIDDEN_BRACKET_BRACKET:
                            break;
                        default:
                            throw new Error("impossible state");
                    }
                    break;
                case GREATER:
                    if (forbiddenState === FORBIDDEN_BRACKET_BRACKET) {
                        this.fail("the string \"]]>\" is disallowed in char data.");
                    }
                    forbiddenState = FORBIDDEN_START;
                    break;
                case NL_LIKE:
                    if (handler !== undefined) {
                        this.text += `${chunk.slice(start, this.prevI)}\n`;
                    }
                    start = this.i;
                    forbiddenState = FORBIDDEN_START;
                    break;
                case EOC:
                    if (handler !== undefined) {
                        this.text += chunk.slice(start);
                    }
                    // eslint-disable-next-line no-labels
                    break scanLoop;
                default:
                    forbiddenState = FORBIDDEN_START;
            }
        }
        this.forbiddenState = forbiddenState;
    }
    handleTextOutsideRoot() {
        // This is essentially a specialized version of captureTo which is optimized
        // for a specialized task. We keep track of the presence of non-space
        // characters in the text since these are errors when appearing outside the
        // document root element.
        let { i: start } = this;
        const { chunk, textHandler: handler } = this;
        let nonSpace = false;
        // eslint-disable-next-line no-labels, no-restricted-syntax
        outRootLoop: 
        // eslint-disable-next-line no-constant-condition
        while (true) {
            const code = this.getCode();
            switch (code) {
                case LESS: {
                    this.state = S_OPEN_WAKA;
                    if (handler !== undefined) {
                        const { text } = this;
                        const slice = chunk.slice(start, this.prevI);
                        if (text.length !== 0) {
                            handler(text + slice);
                            this.text = "";
                        }
                        else if (slice.length !== 0) {
                            handler(slice);
                        }
                    }
                    // eslint-disable-next-line no-labels
                    break outRootLoop;
                }
                case AMP:
                    this.state = S_ENTITY;
                    this.entityReturnState = S_TEXT;
                    if (handler !== undefined) {
                        this.text += chunk.slice(start, this.prevI);
                    }
                    nonSpace = true;
                    // eslint-disable-next-line no-labels
                    break outRootLoop;
                case NL_LIKE:
                    if (handler !== undefined) {
                        this.text += `${chunk.slice(start, this.prevI)}\n`;
                    }
                    start = this.i;
                    break;
                case EOC:
                    if (handler !== undefined) {
                        this.text += chunk.slice(start);
                    }
                    // eslint-disable-next-line no-labels
                    break outRootLoop;
                default:
                    if (!isS(code)) {
                        nonSpace = true;
                    }
            }
        }
        if (!nonSpace) {
            return;
        }
        // We use the reportedTextBeforeRoot and reportedTextAfterRoot flags
        // to avoid reporting errors for every single character that is out of
        // place.
        if (!this.sawRoot && !this.reportedTextBeforeRoot) {
            this.fail("text data outside of root node.");
            this.reportedTextBeforeRoot = true;
        }
        if (this.closedRoot && !this.reportedTextAfterRoot) {
            this.fail("text data outside of root node.");
            this.reportedTextAfterRoot = true;
        }
    }
    pushAttribNS(name, value) {
        var _a;
        const { prefix, local } = this.qname(name);
        const attr = { name, prefix, local, value };
        this.attribList.push(attr);
        // eslint-disable-next-line no-unused-expressions
        (_a = this.attributeHandler) === null || _a === void 0 ? void 0 : _a.call(this, attr);
        if (prefix === "xmlns") {
            const trimmed = value.trim();
            if (this.currentXMLVersion === "1.0" && trimmed === "") {
                this.fail("invalid attempt to undefine prefix in XML 1.0");
            }
            this.topNS[local] = trimmed;
            nsPairCheck(this, local, trimmed);
        }
        else if (name === "xmlns") {
            const trimmed = value.trim();
            this.topNS[""] = trimmed;
            nsPairCheck(this, "", trimmed);
        }
    }
    pushAttribPlain(name, value) {
        var _a;
        const attr = { name, value };
        this.attribList.push(attr);
        // eslint-disable-next-line no-unused-expressions
        (_a = this.attributeHandler) === null || _a === void 0 ? void 0 : _a.call(this, attr);
    }
    /**
     * End parsing. This performs final well-formedness checks and resets the
     * parser to a clean state.
     *
     * @returns this
     */
    end() {
        var _a, _b;
        if (!this.sawRoot) {
            this.fail("document must contain a root element.");
        }
        const { tags } = this;
        while (tags.length > 0) {
            const tag = tags.pop();
            this.fail(`unclosed tag: ${tag.name}`);
        }
        if ((this.state !== S_BEGIN) && (this.state !== S_TEXT)) {
            this.fail("unexpected end.");
        }
        const { text } = this;
        if (text.length !== 0) {
            // eslint-disable-next-line no-unused-expressions
            (_a = this.textHandler) === null || _a === void 0 ? void 0 : _a.call(this, text);
            this.text = "";
        }
        this._closed = true;
        // eslint-disable-next-line no-unused-expressions
        (_b = this.endHandler) === null || _b === void 0 ? void 0 : _b.call(this);
        this._init();
        return this;
    }
    /**
     * Resolve a namespace prefix.
     *
     * @param prefix The prefix to resolve.
     *
     * @returns The namespace URI or ``undefined`` if the prefix is not defined.
     */
    resolve(prefix) {
        var _a, _b;
        let uri = this.topNS[prefix];
        if (uri !== undefined) {
            return uri;
        }
        const { tags } = this;
        for (let index = tags.length - 1; index >= 0; index--) {
            uri = tags[index].ns[prefix];
            if (uri !== undefined) {
                return uri;
            }
        }
        uri = this.ns[prefix];
        if (uri !== undefined) {
            return uri;
        }
        return (_b = (_a = this.opt).resolvePrefix) === null || _b === void 0 ? void 0 : _b.call(_a, prefix);
    }
    /**
     * Parse a qname into its prefix and local name parts.
     *
     * @param name The name to parse
     *
     * @returns
     */
    qname(name) {
        // This is faster than using name.split(":").
        const colon = name.indexOf(":");
        if (colon === -1) {
            return { prefix: "", local: name };
        }
        const local = name.slice(colon + 1);
        const prefix = name.slice(0, colon);
        if (prefix === "" || local === "" || local.includes(":")) {
            this.fail(`malformed name: ${name}.`);
        }
        return { prefix, local };
    }
    processAttribsNS() {
        var _a;
        const { attribList } = this;
        const tag = this.tag;
        {
            // add namespace info to tag
            const { prefix, local } = this.qname(tag.name);
            tag.prefix = prefix;
            tag.local = local;
            const uri = tag.uri = (_a = this.resolve(prefix)) !== null && _a !== void 0 ? _a : "";
            if (prefix !== "") {
                if (prefix === "xmlns") {
                    this.fail("tags may not have \"xmlns\" as prefix.");
                }
                if (uri === "") {
                    this.fail(`unbound namespace prefix: ${JSON.stringify(prefix)}.`);
                    tag.uri = prefix;
                }
            }
        }
        if (attribList.length === 0) {
            return;
        }
        const { attributes } = tag;
        const seen = new Set();
        // Note: do not apply default ns to attributes:
        //   http://www.w3.org/TR/REC-xml-names/#defaulting
        for (const attr of attribList) {
            const { name, prefix, local } = attr;
            let uri;
            let eqname;
            if (prefix === "") {
                uri = name === "xmlns" ? XMLNS_NAMESPACE : "";
                eqname = name;
            }
            else {
                uri = this.resolve(prefix);
                // if there's any attributes with an undefined namespace,
                // then fail on them now.
                if (uri === undefined) {
                    this.fail(`unbound namespace prefix: ${JSON.stringify(prefix)}.`);
                    uri = prefix;
                }
                eqname = `{${uri}}${local}`;
            }
            if (seen.has(eqname)) {
                this.fail(`duplicate attribute: ${eqname}.`);
            }
            seen.add(eqname);
            attr.uri = uri;
            attributes[name] = attr;
        }
        this.attribList = [];
    }
    processAttribsPlain() {
        const { attribList } = this;
        // eslint-disable-next-line prefer-destructuring
        const attributes = this.tag.attributes;
        for (const { name, value } of attribList) {
            if (attributes[name] !== undefined) {
                this.fail(`duplicate attribute: ${name}.`);
            }
            attributes[name] = value;
        }
        this.attribList = [];
    }
    /**
     * Handle a complete open tag. This parser code calls this once it has seen
     * the whole tag. This method checks for well-formeness and then emits
     * ``onopentag``.
     */
    openTag() {
        var _a;
        this.processAttribs();
        const { tags } = this;
        const tag = this.tag;
        tag.isSelfClosing = false;
        // There cannot be any pending text here due to the onopentagstart that was
        // necessarily emitted before we get here. So we do not check text.
        // eslint-disable-next-line no-unused-expressions
        (_a = this.openTagHandler) === null || _a === void 0 ? void 0 : _a.call(this, tag);
        tags.push(tag);
        this.state = S_TEXT;
        this.name = "";
    }
    /**
     * Handle a complete self-closing tag. This parser code calls this once it has
     * seen the whole tag. This method checks for well-formeness and then emits
     * ``onopentag`` and ``onclosetag``.
     */
    openSelfClosingTag() {
        var _a, _b, _c;
        this.processAttribs();
        const { tags } = this;
        const tag = this.tag;
        tag.isSelfClosing = true;
        // There cannot be any pending text here due to the onopentagstart that was
        // necessarily emitted before we get here. So we do not check text.
        // eslint-disable-next-line no-unused-expressions
        (_a = this.openTagHandler) === null || _a === void 0 ? void 0 : _a.call(this, tag);
        // eslint-disable-next-line no-unused-expressions
        (_b = this.closeTagHandler) === null || _b === void 0 ? void 0 : _b.call(this, tag);
        const top = this.tag = (_c = tags[tags.length - 1]) !== null && _c !== void 0 ? _c : null;
        if (top === null) {
            this.closedRoot = true;
        }
        this.state = S_TEXT;
        this.name = "";
    }
    /**
     * Handle a complete close tag. This parser code calls this once it has seen
     * the whole tag. This method checks for well-formeness and then emits
     * ``onclosetag``.
     */
    closeTag() {
        const { tags, name } = this;
        // Our state after this will be S_TEXT, no matter what, and we can clear
        // tagName now.
        this.state = S_TEXT;
        this.name = "";
        if (name === "") {
            this.fail("weird empty close tag.");
            this.text += "</>";
            return;
        }
        const handler = this.closeTagHandler;
        let l = tags.length;
        while (l-- > 0) {
            const tag = this.tag = tags.pop();
            this.topNS = tag.ns;
            // eslint-disable-next-line no-unused-expressions
            handler === null || handler === void 0 ? void 0 : handler(tag);
            if (tag.name === name) {
                break;
            }
            this.fail("unexpected close tag.");
        }
        if (l === 0) {
            this.closedRoot = true;
        }
        else if (l < 0) {
            this.fail(`unmatched closing tag: ${name}.`);
            this.text += `</${name}>`;
        }
    }
    /**
     * Resolves an entity. Makes any necessary well-formedness checks.
     *
     * @param entity The entity to resolve.
     *
     * @returns The parsed entity.
     */
    parseEntity(entity) {
        // startsWith would be significantly slower for this test.
        // eslint-disable-next-line @typescript-eslint/prefer-string-starts-ends-with
        if (entity[0] !== "#") {
            const defined = this.ENTITIES[entity];
            if (defined !== undefined) {
                return defined;
            }
            this.fail(this.isName(entity) ? "undefined entity." :
                "disallowed character in entity name.");
            return `&${entity};`;
        }
        let num = NaN;
        if (entity[1] === "x" && /^#x[0-9a-f]+$/i.test(entity)) {
            num = parseInt(entity.slice(2), 16);
        }
        else if (/^#[0-9]+$/.test(entity)) {
            num = parseInt(entity.slice(1), 10);
        }
        // The character reference is required to match the CHAR production.
        if (!this.isChar(num)) {
            this.fail("malformed character entity.");
            return `&${entity};`;
        }
        return String.fromCodePoint(num);
    }
}
exports.SaxesParser = SaxesParser;
//# sourceMappingURL=saxes.js.map