import { getCodePoint, XML_BITSET_VALUE } from "./escape.js";
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import { htmlTrie } from "./generated/encode-html.js";
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/**
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* We store the characters to consider as a compact bitset for fast lookups.
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*/
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const HTML_BITSET = /* #__PURE__ */ new Uint32Array([
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0x16_00, // Bits for 09,0A,0C
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0xfc_00_ff_fe, // 32..63 -> 21-2D (minus space), 2E,2F,3A-3F
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0xf8_00_00_01, // 64..95 -> 40, 5B-5F
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0x38_00_00_01, // 96..127-> 60, 7B-7D
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]);
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const XML_BITSET = /* #__PURE__ */ new Uint32Array([0, XML_BITSET_VALUE, 0, 0]);
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/**
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* Encodes all characters in the input using HTML entities. This includes
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* characters that are valid ASCII characters in HTML documents, such as `#`.
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*
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* To get a more compact output, consider using the `encodeNonAsciiHTML`
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* function, which will only encode characters that are not valid in HTML
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* documents, as well as non-ASCII characters.
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*
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* If a character has no equivalent entity, a numeric hexadecimal reference
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* (eg. `ü`) will be used.
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*/
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export function encodeHTML(input: string): string {
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return encodeHTMLTrieRe(HTML_BITSET, input);
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}
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/**
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* Encodes all non-ASCII characters, as well as characters not valid in HTML
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* documents using HTML entities. This function will not encode characters that
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* are valid in HTML documents, such as `#`.
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*
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* If a character has no equivalent entity, a numeric hexadecimal reference
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* (eg. `ü`) will be used.
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*/
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export function encodeNonAsciiHTML(input: string): string {
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return encodeHTMLTrieRe(XML_BITSET, input);
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}
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function encodeHTMLTrieRe(bitset: Uint32Array, input: string): string {
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let out: string | undefined;
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let last = 0; // Start of the next untouched slice.
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const { length } = input;
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for (let index = 0; index < length; index++) {
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const char = input.charCodeAt(index);
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// Skip ASCII characters that don't need encoding
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if (char < 0x80 && !((bitset[char >>> 5] >>> char) & 1)) {
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continue;
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}
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if (out === undefined) out = input.substring(0, index);
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else if (last !== index) out += input.substring(last, index);
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let node = htmlTrie.get(char);
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if (typeof node === "object") {
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if (index + 1 < length) {
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const nextChar = input.charCodeAt(index + 1);
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const value =
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typeof node.next === "number"
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? node.next === nextChar
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? node.nextValue
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: undefined
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: node.next.get(nextChar);
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if (value !== undefined) {
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out += value;
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index++;
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last = index + 1;
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continue;
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}
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}
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node = node.value;
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}
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if (node === undefined) {
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const cp = getCodePoint(input, index);
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out += `&#x${cp.toString(16)};`;
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if (cp !== char) index++;
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last = index + 1;
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} else {
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out += node;
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last = index + 1;
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}
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}
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if (out === undefined) return input;
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if (last < length) out += input.substr(last);
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return out;
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}
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