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export const xmlReplacer: RegExp = /["$&'<>\u0080-\uFFFF]/g;
const xmlCodeMap = new Map([
[34, """],
[38, "&"],
[39, "'"],
[60, "<"],
[62, ">"],
]);
// For compatibility with node < 4, we wrap `codePointAt`
export const getCodePoint: (c: string, index: number) => number =
// eslint-disable-next-line @typescript-eslint/no-unnecessary-condition
String.prototype.codePointAt == null
? (c: string, index: number): number =>
(c.charCodeAt(index) & 0xfc_00) === 0xd8_00
? (c.charCodeAt(index) - 0xd8_00) * 0x4_00 +
c.charCodeAt(index + 1) -
0xdc_00 +
0x1_00_00
: c.charCodeAt(index)
: // http://mathiasbynens.be/notes/javascript-encoding#surrogate-formulae
(input: string, index: number): number => input.codePointAt(index)!;
/**
* Encodes all non-ASCII characters, as well as characters not valid in XML
* documents using XML entities.
*
* If a character has no equivalent entity, a
* numeric hexadecimal reference (eg. `ü`) will be used.
*/
export function encodeXML(input: string): string {
let returnValue = "";
let lastIndex = 0;
let match;
while ((match = xmlReplacer.exec(input)) !== null) {
const { index } = match;
const char = input.charCodeAt(index);
const next = xmlCodeMap.get(char);
if (next === undefined) {
returnValue += `${input.substring(lastIndex, index)}&#x${getCodePoint(
input,
index,
).toString(16)};`;
// Increase by 1 if we have a surrogate pair
lastIndex = xmlReplacer.lastIndex += Number(
(char & 0xfc_00) === 0xd8_00,
);
} else {
returnValue += input.substring(lastIndex, index) + next;
lastIndex = index + 1;
}
}
return returnValue + input.substr(lastIndex);
}
/**
* 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;
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, " "],
]),
);
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