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'use strict';

const { DOCUMENT_MODE } = require('./html');

//Const
const VALID_DOCTYPE_NAME = 'html';
const VALID_SYSTEM_ID = 'about:legacy-compat';
const QUIRKS_MODE_SYSTEM_ID = 'http://www.ibm.com/data/dtd/v11/ibmxhtml1-transitional.dtd';

const QUIRKS_MODE_PUBLIC_ID_PREFIXES = [
    '+//silmaril//dtd html pro v0r11 19970101//',
    '-//as//dtd html 3.0 aswedit + extensions//',
    '-//advasoft ltd//dtd html 3.0 aswedit + extensions//',
    '-//ietf//dtd html 2.0 level 1//',
    '-//ietf//dtd html 2.0 level 2//',
    '-//ietf//dtd html 2.0 strict level 1//',
    '-//ietf//dtd html 2.0 strict level 2//',
    '-//ietf//dtd html 2.0 strict//',
    '-//ietf//dtd html 2.0//',
    '-//ietf//dtd html 2.1e//',
    '-//ietf//dtd html 3.0//',
    '-//ietf//dtd html 3.2 final//',
    '-//ietf//dtd html 3.2//',
    '-//ietf//dtd html 3//',
    '-//ietf//dtd html level 0//',
    '-//ietf//dtd html level 1//',
    '-//ietf//dtd html level 2//',
    '-//ietf//dtd html level 3//',
    '-//ietf//dtd html strict level 0//',
    '-//ietf//dtd html strict level 1//',
    '-//ietf//dtd html strict level 2//',
    '-//ietf//dtd html strict level 3//',
    '-//ietf//dtd html strict//',
    '-//ietf//dtd html//',
    '-//metrius//dtd metrius presentational//',
    '-//microsoft//dtd internet explorer 2.0 html strict//',
    '-//microsoft//dtd internet explorer 2.0 html//',
    '-//microsoft//dtd internet explorer 2.0 tables//',
    '-//microsoft//dtd internet explorer 3.0 html strict//',
    '-//microsoft//dtd internet explorer 3.0 html//',
    '-//microsoft//dtd internet explorer 3.0 tables//',
    '-//netscape comm. corp.//dtd html//',
    '-//netscape comm. corp.//dtd strict html//',
    "-//o'reilly and associates//dtd html 2.0//",
    "-//o'reilly and associates//dtd html extended 1.0//",
    "-//o'reilly and associates//dtd html extended relaxed 1.0//",
    '-//sq//dtd html 2.0 hotmetal + extensions//',
    '-//softquad software//dtd hotmetal pro 6.0::19990601::extensions to html 4.0//',
    '-//softquad//dtd hotmetal pro 4.0::19971010::extensions to html 4.0//',
    '-//spyglass//dtd html 2.0 extended//',
    '-//sun microsystems corp.//dtd hotjava html//',
    '-//sun microsystems corp.//dtd hotjava strict html//',
    '-//w3c//dtd html 3 1995-03-24//',
    '-//w3c//dtd html 3.2 draft//',
    '-//w3c//dtd html 3.2 final//',
    '-//w3c//dtd html 3.2//',
    '-//w3c//dtd html 3.2s draft//',
    '-//w3c//dtd html 4.0 frameset//',
    '-//w3c//dtd html 4.0 transitional//',
    '-//w3c//dtd html experimental 19960712//',
    '-//w3c//dtd html experimental 970421//',
    '-//w3c//dtd w3 html//',
    '-//w3o//dtd w3 html 3.0//',
    '-//webtechs//dtd mozilla html 2.0//',
    '-//webtechs//dtd mozilla html//'
];

const QUIRKS_MODE_NO_SYSTEM_ID_PUBLIC_ID_PREFIXES = QUIRKS_MODE_PUBLIC_ID_PREFIXES.concat([
    '-//w3c//dtd html 4.01 frameset//',
    '-//w3c//dtd html 4.01 transitional//'
]);

const QUIRKS_MODE_PUBLIC_IDS = ['-//w3o//dtd w3 html strict 3.0//en//', '-/w3c/dtd html 4.0 transitional/en', 'html'];
const LIMITED_QUIRKS_PUBLIC_ID_PREFIXES = ['-//w3c//dtd xhtml 1.0 frameset//', '-//w3c//dtd xhtml 1.0 transitional//'];

const LIMITED_QUIRKS_WITH_SYSTEM_ID_PUBLIC_ID_PREFIXES = LIMITED_QUIRKS_PUBLIC_ID_PREFIXES.concat([
    '-//w3c//dtd html 4.01 frameset//',
    '-//w3c//dtd html 4.01 transitional//'
]);

//Utils
function enquoteDoctypeId(id) {
    const quote = id.indexOf('"') !== -1 ? "'" : '"';

    return quote + id + quote;
}

function hasPrefix(publicId, prefixes) {
    for (let i = 0; i < prefixes.length; i++) {
        if (publicId.indexOf(prefixes[i]) === 0) {
            return true;
        }
    }

    return false;
}

//API
exports.isConforming = function(token) {
    return (
        token.name === VALID_DOCTYPE_NAME &&
        token.publicId === null &&
        (token.systemId === null || token.systemId === VALID_SYSTEM_ID)
    );
};

exports.getDocumentMode = function(token) {
    if (token.name !== VALID_DOCTYPE_NAME) {
        return DOCUMENT_MODE.QUIRKS;
    }

    const systemId = token.systemId;

    if (systemId && systemId.toLowerCase() === QUIRKS_MODE_SYSTEM_ID) {
        return DOCUMENT_MODE.QUIRKS;
    }

    let publicId = token.publicId;

    if (publicId !== null) {
        publicId = publicId.toLowerCase();

        if (QUIRKS_MODE_PUBLIC_IDS.indexOf(publicId) > -1) {
            return DOCUMENT_MODE.QUIRKS;
        }

        let prefixes = systemId === null ? QUIRKS_MODE_NO_SYSTEM_ID_PUBLIC_ID_PREFIXES : QUIRKS_MODE_PUBLIC_ID_PREFIXES;

        if (hasPrefix(publicId, prefixes)) {
            return DOCUMENT_MODE.QUIRKS;
        }

        prefixes =
            systemId === null ? LIMITED_QUIRKS_PUBLIC_ID_PREFIXES : LIMITED_QUIRKS_WITH_SYSTEM_ID_PUBLIC_ID_PREFIXES;

        if (hasPrefix(publicId, prefixes)) {
            return DOCUMENT_MODE.LIMITED_QUIRKS;
        }
    }

    return DOCUMENT_MODE.NO_QUIRKS;
};

exports.serializeContent = function(name, publicId, systemId) {
    let str = '!DOCTYPE ';

    if (name) {
        str += name;
    }

    if (publicId) {
        str += ' PUBLIC ' + enquoteDoctypeId(publicId);
    } else if (systemId) {
        str += ' SYSTEM';
    }

    if (systemId !== null) {
        str += ' ' + enquoteDoctypeId(systemId);
    }

    return str;
};