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const xmlCodeMap = new Map([
    [34, """],
    [38, "&"],
    [39, "'"],
    [60, "<"],
    [62, ">"],
]);
// For compatibility with node < 4, we wrap `codePointAt`
/**
 * Read a code point at a given index.
 * @param input Input string to encode or decode.
 * @param index Current read position in the input string.
 */
export const getCodePoint = typeof String.prototype.codePointAt === "function"
    ? (input, index) => input.codePointAt(index)
    : // http://mathiasbynens.be/notes/javascript-encoding#surrogate-formulae
        (c, index) => (c.charCodeAt(index) & 0xfc_00) === 0xd8_00
            ? (c.charCodeAt(index) - 0xd8_00) * 0x4_00 +
                c.charCodeAt(index + 1) -
                0xdc_00 +
                0x1_00_00
            : c.charCodeAt(index);
/**
 * Bitset for ASCII characters that need to be escaped in XML.
 */
export const XML_BITSET_VALUE = 0x50_00_00_c4; // 32..63 -> 34 ("),38 (&),39 ('),60 (<),62 (>)
/**
 * Encodes all non-ASCII characters, as well as characters not valid in XML
 * documents using XML entities. Uses a fast bitset scan instead of RegExp.
 *
 * If a character has no equivalent entity, a numeric hexadecimal reference
 * (eg. `&#xfc;`) will be used.
 * @param input Input string to encode or decode.
 */
export function encodeXML(input) {
    let out;
    let last = 0;
    const { length } = input;
    for (let index = 0; index < length; index++) {
        const char = input.charCodeAt(index);
        // Check for ASCII chars that don't need escaping
        if (char < 0x80 &&
            (((XML_BITSET_VALUE >>> char) & 1) === 0 || char >= 64 || char < 32)) {
            continue;
        }
        if (out === undefined)
            out = input.substring(0, index);
        else if (last !== index)
            out += input.substring(last, index);
        if (char < 64) {
            // Known replacement
            out += xmlCodeMap.get(char);
            last = index + 1;
            continue;
        }
        // Non-ASCII: encode as numeric entity (handle surrogate pair)
        const cp = getCodePoint(input, index);
        out += `&#x${cp.toString(16)};`;
        if (cp !== char)
            index++; // Skip trailing surrogate
        last = index + 1;
    }
    if (out === undefined)
        return input;
    if (last < length)
        out += input.substr(last);
    return out;
}
/**
 * Encodes all non-ASCII characters, as well as characters not valid in XML
 * documents using numeric hexadecimal reference (eg. `&#xfc;`).
 *
 * Have a look at `escapeUTF8` if you want a more concise output at the expense
 * of reduced transportability.
 * @param data String to escape.
 */
export const escape = encodeXML;
/**
 * Creates a function that escapes all characters matched by the given regular
 * expression using the given map of characters to escape to their entities.
 * @param regex Regular expression to match characters to escape.
 * @param map Map of characters to escape to their entities.
 * @returns Function that escapes all characters matched by the given regular
 * expression using the given map of characters to escape to their entities.
 */
function getEscaper(regex, map) {
    return function escape(data) {
        let match;
        let lastIndex = 0;
        let result = "";
        while ((match = regex.exec(data))) {
            if (lastIndex !== match.index) {
                result += data.substring(lastIndex, match.index);
            }
            // We know that this character will be in the map.
            result += map.get(match[0].charCodeAt(0));
            // Every match will be of length 1
            lastIndex = match.index + 1;
        }
        return result + data.substring(lastIndex);
    };
}
/**
 * Encodes all characters not valid in XML documents using XML entities.
 *
 * Note that the output will be character-set dependent.
 * @param data String to escape.
 */
export const escapeUTF8 = /* #__PURE__ */ getEscaper(/["&'<>]/g, xmlCodeMap);
/**
 * Encodes all characters that have to be escaped in HTML attributes,
 * following {@link https://html.spec.whatwg.org/multipage/parsing.html#escapingString}.
 * @param data String to escape.
 */
export const escapeAttribute = 
/* #__PURE__ */ getEscaper(/["&\u00A0]/g, new Map([
    [34, "&quot;"],
    [38, "&amp;"],
    [160, "&nbsp;"],
]));
/**
 * Encodes all characters that have to be escaped in HTML text,
 * following {@link https://html.spec.whatwg.org/multipage/parsing.html#escapingString}.
 * @param data String to escape.
 */
export const escapeText = /* #__PURE__ */ getEscaper(/[&<>\u00A0]/g, new Map([
    [38, "&amp;"],
    [60, "&lt;"],
    [62, "&gt;"],
    [160, "&nbsp;"],
]));
//# sourceMappingURL=escape.js.map