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encode.js
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Sat, Dec 14, 05:27

encode.js
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import htmlTrie from "./generated/encode-html.js";
import { xmlReplacer, getCodePoint } from "./escape.js";
const htmlReplacer = /[\t\n!-,./:-@[-`\f{-}$\x80-\uFFFF]/g;
/**
* Encodes all characters in the input using HTML entities. This includes
* characters that are valid ASCII characters in HTML documents, such as `#`.
*
* To get a more compact output, consider using the `encodeNonAsciiHTML`
* function, which will only encode characters that are not valid in HTML
* documents, as well as non-ASCII characters.
*
* If a character has no equivalent entity, a numeric hexadecimal reference
* (eg. `ü`) will be used.
*/
export function encodeHTML(data) {
return encodeHTMLTrieRe(htmlReplacer, data);
}
/**
* Encodes all non-ASCII characters, as well as characters not valid in HTML
* documents using HTML entities. This function will not encode characters that
* are valid in HTML documents, such as `#`.
*
* If a character has no equivalent entity, a numeric hexadecimal reference
* (eg. `ü`) will be used.
*/
export function encodeNonAsciiHTML(data) {
return encodeHTMLTrieRe(xmlReplacer, data);
}
function encodeHTMLTrieRe(regExp, str) {
let ret = "";
let lastIdx = 0;
let match;
while ((match = regExp.exec(str)) !== null) {
const i = match.index;
ret += str.substring(lastIdx, i);
const char = str.charCodeAt(i);
let next = htmlTrie.get(char);
if (typeof next === "object") {
// We are in a branch. Try to match the next char.
if (i + 1 < str.length) {
const nextChar = str.charCodeAt(i + 1);
const value = typeof next.n === "number"
? next.n === nextChar
? next.o
: undefined
: next.n.get(nextChar);
if (value !== undefined) {
ret += value;
lastIdx = regExp.lastIndex += 1;
continue;
}
}
next = next.v;
}
// We might have a tree node without a value; skip and use a numeric entitiy.
if (next !== undefined) {
ret += next;
lastIdx = i + 1;
}
else {
const cp = getCodePoint(str, i);
ret += `&#x${cp.toString(16)};`;
// Increase by 1 if we have a surrogate pair
lastIdx = regExp.lastIndex += Number(cp !== char);
}
}
return ret + str.substr(lastIdx);
}
//# sourceMappingURL=encode.js.map

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