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lotus
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'use strict';

const internals = {};


module.exports = function (input) {

    if (!input) {
        return '';
    }

    let escaped = '';

    for (let i = 0; i < input.length; ++i) {

        const charCode = input.charCodeAt(i);

        if (internals.isSafe(charCode)) {
            escaped += input[i];
        }
        else {
            escaped += internals.escapeHtmlChar(charCode);
        }
    }

    return escaped;
};


internals.escapeHtmlChar = function (charCode) {

    const namedEscape = internals.namedHtml[charCode];
    if (typeof namedEscape !== 'undefined') {
        return namedEscape;
    }

    if (charCode >= 256) {
        return '&#' + charCode + ';';
    }

    const hexValue = charCode.toString(16).padStart(2, '0');
    return `&#x${hexValue};`;
};


internals.isSafe = function (charCode) {

    return (typeof internals.safeCharCodes[charCode] !== 'undefined');
};


internals.namedHtml = {
    '38': '&amp;',
    '60': '&lt;',
    '62': '&gt;',
    '34': '&quot;',
    '160': '&nbsp;',
    '162': '&cent;',
    '163': '&pound;',
    '164': '&curren;',
    '169': '&copy;',
    '174': '&reg;'
};


internals.safeCharCodes = (function () {

    const safe = {};

    for (let i = 32; i < 123; ++i) {

        if ((i >= 97) ||                    // a-z
            (i >= 65 && i <= 90) ||         // A-Z
            (i >= 48 && i <= 57) ||         // 0-9
            i === 32 ||                     // space
            i === 46 ||                     // .
            i === 44 ||                     // ,
            i === 45 ||                     // -
            i === 58 ||                     // :
            i === 95) {                     // _

            safe[i] = null;
        }
    }

    return safe;
}());