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Filename : 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. `&#xfc;`) 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. `&#xfc;`) 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 entity.
        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);
}
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