import * as P from 'parsimmon'; import { createLeaf, createTree, urlRegex } from './prelude'; import { takeWhile, cumulativeSum } from '../prelude/array'; import parseAcct from '../misc/acct/parse'; import { toUnicode } from 'punycode'; import { emojiRegex } from '../misc/emoji-regex'; export function removeOrphanedBrackets(s: string): string { const openBrackets = ['(', '「', '[']; const closeBrackets = [')', '」', ']']; const xs = cumulativeSum(s.split('').map(c => { if (openBrackets.includes(c)) return 1; if (closeBrackets.includes(c)) return -1; return 0; })); const firstOrphanedCloseBracket = xs.findIndex(x => x < 0); if (firstOrphanedCloseBracket !== -1) return s.substr(0, firstOrphanedCloseBracket); const lastMatched = xs.lastIndexOf(0); return s.substr(0, lastMatched + 1); } export const mfmLanguage = P.createLanguage({ root: r => P.alt(r.block, r.inline).atLeast(1), plain: r => P.alt(r.emoji, r.text).atLeast(1), block: r => P.alt( r.quote, r.search, r.blockCode, r.mathBlock, r.center, ), startOfLine: () => P((input, i) => { if (i === 0 || input[i] === '\n' || input[i - 1] === '\n') { return P.makeSuccess(i, null); } else { return P.makeFailure(i, 'not newline'); } }), quote: r => r.startOfLine.then(P((input, i) => { const text = input.substr(i); if (!text.match(/^>[\s\S]+?/)) return P.makeFailure(i, 'not a quote'); const quote = takeWhile(line => line.startsWith('>'), text.split('\n')); const qInner = quote.join('\n').replace(/^>/gm, '').replace(/^ /gm, ''); if (qInner === '') return P.makeFailure(i, 'not a quote'); const contents = r.root.tryParse(qInner); return P.makeSuccess(i + quote.join('\n').length + 1, createTree('quote', contents, {})); })), search: r => r.startOfLine.then(P((input, i) => { const text = input.substr(i); const match = text.match(/^(.+?)( | )(検索|\[検索\]|Search|\[Search\])(\n|$)/i); if (!match) return P.makeFailure(i, 'not a search'); return P.makeSuccess(i + match[0].length, createLeaf('search', { query: match[1], content: match[0].trim() })); })), blockCode: r => r.startOfLine.then(P((input, i) => { const text = input.substr(i); const match = text.match(/^```(.+?)?\n([\s\S]+?)\n```(\n|$)/i); if (!match) return P.makeFailure(i, 'not a blockCode'); return P.makeSuccess(i + match[0].length, createLeaf('blockCode', { code: match[2], lang: match[1] ? match[1].trim() : null })); })), inline: r => P.alt( r.bold, r.small, r.italic, r.strike, r.inlineCode, r.mathInline, r.mention, r.hashtag, r.url, r.link, r.emoji, r.fn, r.text ), bold: r => { const asterisk = P.regexp(/\*\*([\s\S]+?)\*\*/, 1); const underscore = P.regexp(/__([a-zA-Z0-9\s]+?)__/, 1); return P.alt(asterisk, underscore).map(x => createTree('bold', r.inline.atLeast(1).tryParse(x), {})); }, small: r => P.regexp(/([\s\S]+?)<\/small>/, 1).map(x => createTree('small', r.inline.atLeast(1).tryParse(x), {})), italic: r => { const xml = P.regexp(/([\s\S]+?)<\/i>/, 1); const underscore = P((input, i) => { const text = input.substr(i); const match = text.match(/^(\*|_)([a-zA-Z0-9]+?[\s\S]*?)\1/); if (!match) return P.makeFailure(i, 'not a italic'); if (input[i - 1] != null && input[i - 1] != ' ' && input[i - 1] != '\n') return P.makeFailure(i, 'not a italic'); return P.makeSuccess(i + match[0].length, match[2]); }); return P.alt(xml, underscore).map(x => createTree('italic', r.inline.atLeast(1).tryParse(x), {})); }, strike: r => P.regexp(/~~([^\n~]+?)~~/, 1).map(x => createTree('strike', r.inline.atLeast(1).tryParse(x), {})), center: r => r.startOfLine.then(P.regexp(/
([\s\S]+?)<\/center>/, 1).map(x => createTree('center', r.inline.atLeast(1).tryParse(x), {}))), inlineCode: () => P.regexp(/`([^´\n]+?)`/, 1).map(x => createLeaf('inlineCode', { code: x })), mathBlock: r => r.startOfLine.then(P.regexp(/\\\[([\s\S]+?)\\\]/, 1).map(x => createLeaf('mathBlock', { formula: x.trim() }))), mathInline: () => P.regexp(/\\\((.+?)\\\)/, 1).map(x => createLeaf('mathInline', { formula: x })), mention: () => { return P((input, i) => { const text = input.substr(i); const match = text.match(/^@\w([\w-]*\w)?(?:@[\w.\-]+\w)?/); if (!match) return P.makeFailure(i, 'not a mention'); if (input[i - 1] != null && input[i - 1].match(/[a-z0-9]/i)) return P.makeFailure(i, 'not a mention'); return P.makeSuccess(i + match[0].length, match[0]); }).map(x => { const { username, host } = parseAcct(x.substr(1)); const canonical = host != null ? `@${username}@${toUnicode(host)}` : x; return createLeaf('mention', { canonical, username, host, acct: x }); }); }, hashtag: () => P((input, i) => { const text = input.substr(i); const match = text.match(/^#([^\s.,!?'"#:\/\[\]【】]+)/i); if (!match) return P.makeFailure(i, 'not a hashtag'); let hashtag = match[1]; hashtag = removeOrphanedBrackets(hashtag); if (hashtag.match(/^(\u20e3|\ufe0f)/)) return P.makeFailure(i, 'not a hashtag'); if (hashtag.match(/^[0-9]+$/)) return P.makeFailure(i, 'not a hashtag'); if (input[i - 1] != null && input[i - 1].match(/[a-z0-9]/i)) return P.makeFailure(i, 'not a hashtag'); if (Array.from(hashtag || '').length > 128) return P.makeFailure(i, 'not a hashtag'); return P.makeSuccess(i + ('#' + hashtag).length, createLeaf('hashtag', { hashtag: hashtag })); }), url: () => { return P((input, i) => { const text = input.substr(i); const match = text.match(urlRegex); let url: string; if (!match) { const match = text.match(/^<(https?:\/\/.*?)>/); if (!match) { return P.makeFailure(i, 'not a url'); } url = match[1]; i += 2; } else { url = match[0]; } url = removeOrphanedBrackets(url); url = url.replace(/[.,]*$/, ''); return P.makeSuccess(i + url.length, url); }).map(x => createLeaf('url', { url: x })); }, link: r => { return P.seqObj( ['silent', P.string('?').fallback(null).map(x => x != null)] as any, P.string('['), ['text', P.regexp(/[^\n\[\]]+/)] as any, P.string(']'), P.string('('), ['url', r.url] as any, P.string(')'), ).map((x: any) => { return createTree('link', r.inline.atLeast(1).tryParse(x.text), { silent: x.silent, url: x.url.node.props.url }); }); }, emoji: () => { const name = P.regexp(/:([a-z0-9_+-]+):/i, 1).map(x => createLeaf('emoji', { name: x })); const code = P.regexp(emojiRegex).map(x => createLeaf('emoji', { emoji: x })); return P.alt(name, code); }, fn: r => { return P.seqObj( P.string('['), ['fn', P.regexp(/[^\s\n\[\]]+/)] as any, P.string(' '), P.optWhitespace, ['text', P.regexp(/[^\n\[\]]+/)] as any, P.string(']'), ).map((x: any) => { let name = x.fn; const args = {}; const separator = x.fn.indexOf('.'); if (separator > -1) { name = x.fn.substr(0, separator); for (const arg of x.fn.substr(separator + 1).split(',')) { const kv = arg.split('='); if (kv.length === 1) { args[kv[0]] = true; } else { args[kv[0]] = kv[1]; } } } return createTree('fn', r.inline.atLeast(1).tryParse(x.text), { name, args }); }); }, text: () => P.any.map(x => createLeaf('text', { text: x })) });