137 lines
4.8 KiB
JavaScript
137 lines
4.8 KiB
JavaScript
/**
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* MIT License
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*
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* Copyright (c) 2021 Andrew Raffensperger
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*
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* Permission is hereby granted, free of charge, to any person obtaining a copy
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* of this software and associated documentation files (the "Software"), to deal
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* in the Software without restriction, including without limitation the rights
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* to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
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* copies of the Software, and to permit persons to whom the Software is
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* furnished to do so, subject to the following conditions:
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*
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* The above copyright notice and this permission notice shall be included in all
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* copies or substantial portions of the Software.
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*
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* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
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* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
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* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
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* SOFTWARE.
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*
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* This is a near carbon-copy of the original source (link below) with the
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* TypeScript typings added and a few tweaks to make it ES3-compatible.
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*
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* See: https://github.com/adraffy/ens-normalize.js
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*/
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import { toUtf8CodePoints } from "@ethersproject/strings";
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import { getData } from './include.js';
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const r = getData();
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import { read_member_array, read_mapped_map, read_emoji_trie } from './decoder.js';
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// @TODO: This should be lazily loaded
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const VALID = new Set(read_member_array(r));
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const IGNORED = new Set(read_member_array(r));
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const MAPPED = read_mapped_map(r);
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const EMOJI_ROOT = read_emoji_trie(r);
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//const NFC_CHECK = new Set(read_member_array(r, Array.from(VALID.values()).sort((a, b) => a - b)));
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//const STOP = 0x2E;
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const HYPHEN = 0x2D;
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const UNDERSCORE = 0x5F;
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function explode_cp(name) {
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return toUtf8CodePoints(name);
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}
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function filter_fe0f(cps) {
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return cps.filter(cp => cp != 0xFE0F);
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}
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export function ens_normalize_post_check(name) {
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for (let label of name.split('.')) {
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let cps = explode_cp(label);
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try {
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for (let i = cps.lastIndexOf(UNDERSCORE) - 1; i >= 0; i--) {
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if (cps[i] !== UNDERSCORE) {
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throw new Error(`underscore only allowed at start`);
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}
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}
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if (cps.length >= 4 && cps.every(cp => cp < 0x80) && cps[2] === HYPHEN && cps[3] === HYPHEN) {
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throw new Error(`invalid label extension`);
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}
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}
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catch (err) {
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throw new Error(`Invalid label "${label}": ${err.message}`);
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}
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}
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return name;
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}
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export function ens_normalize(name) {
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return ens_normalize_post_check(normalize(name, filter_fe0f));
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}
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function normalize(name, emoji_filter) {
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let input = explode_cp(name).reverse(); // flip for pop
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let output = [];
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while (input.length) {
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let emoji = consume_emoji_reversed(input);
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if (emoji) {
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output.push(...emoji_filter(emoji));
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continue;
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}
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let cp = input.pop();
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if (VALID.has(cp)) {
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output.push(cp);
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continue;
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}
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if (IGNORED.has(cp)) {
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continue;
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}
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let cps = MAPPED[cp];
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if (cps) {
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output.push(...cps);
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continue;
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}
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throw new Error(`Disallowed codepoint: 0x${cp.toString(16).toUpperCase()}`);
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}
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return ens_normalize_post_check(nfc(String.fromCodePoint(...output)));
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}
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function nfc(s) {
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return s.normalize('NFC');
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}
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function consume_emoji_reversed(cps, eaten) {
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var _a;
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let node = EMOJI_ROOT;
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let emoji;
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let saved;
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let stack = [];
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let pos = cps.length;
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if (eaten)
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eaten.length = 0; // clear input buffer (if needed)
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while (pos) {
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let cp = cps[--pos];
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node = (_a = node.branches.find(x => x.set.has(cp))) === null || _a === void 0 ? void 0 : _a.node;
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if (!node)
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break;
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if (node.save) { // remember
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saved = cp;
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}
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else if (node.check) { // check exclusion
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if (cp === saved)
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break;
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}
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stack.push(cp);
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if (node.fe0f) {
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stack.push(0xFE0F);
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if (pos > 0 && cps[pos - 1] == 0xFE0F)
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pos--; // consume optional FE0F
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}
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if (node.valid) { // this is a valid emoji (so far)
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emoji = stack.slice(); // copy stack
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if (node.valid == 2)
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emoji.splice(1, 1); // delete FE0F at position 1 (RGI ZWJ don't follow spec!)
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if (eaten)
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eaten.push(...cps.slice(pos).reverse()); // copy input (if needed)
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cps.length = pos; // truncate
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}
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}
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return emoji;
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}
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//# sourceMappingURL=lib.js.map
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