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const xmlCodeMap = new Map([
[34, """],
[38, "&"],
[39, "'"],
[60, "<"],
[62, ">"],
]);
// For compatibility with node < 4, we wrap `codePointAt`
export const getCodePoint: (c: string, index: number) => number =
// eslint-disable-next-line @typescript-eslint/no-unnecessary-condition
String.prototype.codePointAt == null
? (c: string, index: number): number =>
(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)
: // http://mathiasbynens.be/notes/javascript-encoding#surrogate-formulae
(input: string, index: number): number => input.codePointAt(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. `ü`) will be used.
*/
export function encodeXML(input: string): string {
let out: string | undefined;
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. `ü`).
*
* 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: typeof encodeXML = 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: RegExp,
map: Map<number, string>,
): (data: string) => string {
return function escape(data: string): string {
let match: RegExpExecArray | null;
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: (data: string) => string = /* #__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: (data: string) => string =
/* #__PURE__ */ getEscaper(
/["&\u00A0]/g,
new Map([
[34, """],
[38, "&"],
[160, " "],
]),
);
/**
* 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: (data: string) => string = /* #__PURE__ */ getEscaper(
/[&<>\u00A0]/g,
new Map([
[38, "&"],
[60, "<"],
[62, ">"],
[160, " "],
]),
);