Improve MFM parser (#3337)

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* Refactor

* Refactor

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* Refactor

* Refactor

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* Clean up

* Update misskey-flavored-markdown.ts

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* Update parser.ts

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* Add new test

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* Add new test

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* Refactor

* Update parse.ts

* Refactor

* Update parser.ts

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15 files changed, 0 insertions, 340 deletions

diff --git a/src/mfm/parse/elements/big.ts b/src/mfm/parse/elements/big.ts
deleted file mode 100644
index 24e8bad50e..0000000000
--- a/src/mfm/parse/elements/big.ts
+++ /dev/null
@@ -1,20 +0,0 @@
-/**
- * Big
- */
-
-export type TextElementBig = {
-	type: 'big';
-	content: string;
-	big: string;
-};
-
-export default function(text: string) {
-	const match = text.match(/^\*\*\*(.+?)\*\*\*/);
-	if (!match) return null;
-	const big = match[0];
-	return {
-		type: 'big',
-		content: big,
-		big: match[1]
-	} as TextElementBig;
-}
diff --git a/src/mfm/parse/elements/bold.ts b/src/mfm/parse/elements/bold.ts
deleted file mode 100644
index 42c9cf0e1e..0000000000
--- a/src/mfm/parse/elements/bold.ts
+++ /dev/null
@@ -1,20 +0,0 @@
-/**
- * Bold
- */
-
-export type TextElementBold = {
-	type: 'bold';
-	content: string;
-	bold: string;
-};
-
-export default function(text: string) {
-	const match = text.match(/^\*\*(.+?)\*\*/);
-	if (!match) return null;
-	const bold = match[0];
-	return {
-		type: 'bold',
-		content: bold,
-		bold: match[1]
-	} as TextElementBold;
-}
diff --git a/src/mfm/parse/elements/code.ts b/src/mfm/parse/elements/code.ts
deleted file mode 100644
index 63a535fc55..0000000000
--- a/src/mfm/parse/elements/code.ts
+++ /dev/null
@@ -1,24 +0,0 @@
-/**
- * Code (block)
- */
-
-import genHtml from '../core/syntax-highlighter';
-
-export type TextElementCode = {
-	type: 'code';
-	content: string;
-	code: string;
-	html: string;
-};
-
-export default function(text: string) {
-	const match = text.match(/^```([\s\S]+?)```/);
-	if (!match) return null;
-	const code = match[0];
-	return {
-		type: 'code',
-		content: code,
-		code: match[1],
-		html: genHtml(match[1].trim())
-	} as TextElementCode;
-}
diff --git a/src/mfm/parse/elements/emoji.regex.ts b/src/mfm/parse/elements/emoji.regex.ts
deleted file mode 100644
index a5c6b71825..0000000000
--- a/src/mfm/parse/elements/emoji.regex.ts
+++ /dev/null
@@ -1,2 +0,0 @@
-// https://github.com/twitter/twemoji/blob/fc458b467c1bd706acd8653028ee8ab3e6562ce3/2/scripts/regex
-export const emojiRegex = /^((?:\ud83d[\udc68\udc69])(?:\ud83c[\udffb-\udfff])?\u200d(?:\u2695\ufe0f|\u2696\ufe0f|\u2708\ufe0f|\ud83c[\udf3e\udf73\udf93\udfa4\udfa8\udfeb\udfed]|\ud83d[\udcbb\udcbc\udd27\udd2c\ude80\ude92]|\ud83e[\uddb0-\uddb3])|(?:\ud83c[\udfcb\udfcc]|\ud83d[\udd74\udd75]|\u26f9)((?:\ud83c[\udffb-\udfff]|\ufe0f)\u200d[\u2640\u2642]\ufe0f)|(?:\ud83c[\udfc3\udfc4\udfca]|\ud83d[\udc6e\udc71\udc73\udc77\udc81\udc82\udc86\udc87\ude45-\ude47\ude4b\ude4d\ude4e\udea3\udeb4-\udeb6]|\ud83e[\udd26\udd35\udd37-\udd39\udd3d\udd3e\uddb8\uddb9\uddd6-\udddd])(?:\ud83c[\udffb-\udfff])?\u200d[\u2640\u2642]\ufe0f|(?:\ud83d\udc68\u200d\u2764\ufe0f\u200d\ud83d\udc8b\u200d\ud83d\udc68|\ud83d\udc68\u200d\ud83d\udc68\u200d\ud83d\udc66\u200d\ud83d\udc66|\ud83d\udc68\u200d\ud83d\udc68\u200d\ud83d\udc67\u200d\ud83d[\udc66\udc67]|\ud83d\udc68\u200d\ud83d\udc69\u200d\ud83d\udc66\u200d\ud83d\udc66|\ud83d\udc68\u200d\ud83d\udc69\u200d\ud83d\udc67\u200d\ud83d[\udc66\udc67]|\ud83d\udc69\u200d\u2764\ufe0f\u200d\ud83d\udc8b\u200d\ud83d[\udc68\udc69]|\ud83d\udc69\u200d\ud83d\udc69\u200d\ud83d\udc66\u200d\ud83d\udc66|\ud83d\udc69\u200d\ud83d\udc69\u200d\ud83d\udc67\u200d\ud83d[\udc66\udc67]|\ud83d\udc68\u200d\u2764\ufe0f\u200d\ud83d\udc68|\ud83d\udc68\u200d\ud83d\udc66\u200d\ud83d\udc66|\ud83d\udc68\u200d\ud83d\udc67\u200d\ud83d[\udc66\udc67]|\ud83d\udc68\u200d\ud83d\udc68\u200d\ud83d[\udc66\udc67]|\ud83d\udc68\u200d\ud83d\udc69\u200d\ud83d[\udc66\udc67]|\ud83d\udc69\u200d\u2764\ufe0f\u200d\ud83d[\udc68\udc69]|\ud83d\udc69\u200d\ud83d\udc66\u200d\ud83d\udc66|\ud83d\udc69\u200d\ud83d\udc67\u200d\ud83d[\udc66\udc67]|\ud83d\udc69\u200d\ud83d\udc69\u200d\ud83d[\udc66\udc67]|\ud83c\udff3\ufe0f\u200d\ud83c\udf08|\ud83c\udff4\u200d\u2620\ufe0f|\ud83d\udc41\u200d\ud83d\udde8|\ud83d\udc68\u200d\ud83d[\udc66\udc67]|\ud83d\udc69\u200d\ud83d[\udc66\udc67]|\ud83d\udc6f\u200d\u2640\ufe0f|\ud83d\udc6f\u200d\u2642\ufe0f|\ud83e\udd3c\u200d\u2640\ufe0f|\ud83e\udd3c\u200d\u2642\ufe0f|\ud83e\uddde\u200d\u2640\ufe0f|\ud83e\uddde\u200d\u2642\ufe0f|\ud83e\udddf\u200d\u2640\ufe0f|\ud83e\udddf\u200d\u2642\ufe0f)|[\u0023\u002a\u0030-\u0039]\ufe0f?\u20e3|(?:[\u00a9\u00ae\u2122\u265f]\ufe0f)|(?:\ud83c[\udc04\udd70\udd71\udd7e\udd7f\ude02\ude1a\ude2f\ude37\udf21\udf24-\udf2c\udf36\udf7d\udf96\udf97\udf99-\udf9b\udf9e\udf9f\udfcd\udfce\udfd4-\udfdf\udff3\udff5\udff7]|\ud83d[\udc3f\udc41\udcfd\udd49\udd4a\udd6f\udd70\udd73\udd76-\udd79\udd87\udd8a-\udd8d\udda5\udda8\uddb1\uddb2\uddbc\uddc2-\uddc4\uddd1-\uddd3\udddc-\uddde\udde1\udde3\udde8\uddef\uddf3\uddfa\udecb\udecd-\udecf\udee0-\udee5\udee9\udef0\udef3]|[\u203c\u2049\u2139\u2194-\u2199\u21a9\u21aa\u231a\u231b\u2328\u23cf\u23ed-\u23ef\u23f1\u23f2\u23f8-\u23fa\u24c2\u25aa\u25ab\u25b6\u25c0\u25fb-\u25fe\u2600-\u2604\u260e\u2611\u2614\u2615\u2618\u2620\u2622\u2623\u2626\u262a\u262e\u262f\u2638-\u263a\u2640\u2642\u2648-\u2653\u2660\u2663\u2665\u2666\u2668\u267b\u267f\u2692-\u2697\u2699\u269b\u269c\u26a0\u26a1\u26aa\u26ab\u26b0\u26b1\u26bd\u26be\u26c4\u26c5\u26c8\u26cf\u26d1\u26d3\u26d4\u26e9\u26ea\u26f0-\u26f5\u26f8\u26fa\u26fd\u2702\u2708\u2709\u270f\u2712\u2714\u2716\u271d\u2721\u2733\u2734\u2744\u2747\u2757\u2763\u2764\u27a1\u2934\u2935\u2b05-\u2b07\u2b1b\u2b1c\u2b50\u2b55\u3030\u303d\u3297\u3299])(?:\ufe0f|(?!\ufe0e))|(?:(?:\ud83c[\udfcb\udfcc]|\ud83d[\udd74\udd75\udd90]|[\u261d\u26f7\u26f9\u270c\u270d])(?:\ufe0f|(?!\ufe0e))|(?:\ud83c[\udf85\udfc2-\udfc4\udfc7\udfca]|\ud83d[\udc42\udc43\udc46-\udc50\udc66-\udc69\udc6e\udc70-\udc78\udc7c\udc81-\udc83\udc85-\udc87\udcaa\udd7a\udd95\udd96\ude45-\ude47\ude4b-\ude4f\udea3\udeb4-\udeb6\udec0\udecc]|\ud83e[\udd18-\udd1c\udd1e\udd1f\udd26\udd30-\udd39\udd3d\udd3e\uddb5\uddb6\uddb8\uddb9\uddd1-\udddd]|[\u270a\u270b]))(?:\ud83c[\udffb-\udfff])?|(?:\ud83c\udff4\udb40\udc67\udb40\udc62\udb40\udc65\udb40\udc6e\udb40\udc67\udb40\udc7f|\ud83c\udff4\udb40\udc67\udb40\udc62\udb40\udc73\udb40\udc63\udb40\udc74\udb40\udc7f|\ud83c\udff4\udb40\udc67\udb40\udc62\udb40\udc77\udb40\udc6c\udb40\udc73\udb40\udc7f|\ud83c\udde6\ud83c[\udde8-\uddec\uddee\uddf1\uddf2\uddf4\uddf6-\uddfa\uddfc\uddfd\uddff]|\ud83c\udde7\ud83c[\udde6\udde7\udde9-\uddef\uddf1-\uddf4\uddf6-\uddf9\uddfb\uddfc\uddfe\uddff]|\ud83c\udde8\ud83c[\udde6\udde8\udde9\uddeb-\uddee\uddf0-\uddf5\uddf7\uddfa-\uddff]|\ud83c\udde9\ud83c[\uddea\uddec\uddef\uddf0\uddf2\uddf4\uddff]|\ud83c\uddea\ud83c[\udde6\udde8\uddea\uddec\udded\uddf7-\uddfa]|\ud83c\uddeb\ud83c[\uddee-\uddf0\uddf2\uddf4\uddf7]|\ud83c\uddec\ud83c[\udde6\udde7\udde9-\uddee\uddf1-\uddf3\uddf5-\uddfa\uddfc\uddfe]|\ud83c\udded\ud83c[\uddf0\uddf2\uddf3\uddf7\uddf9\uddfa]|\ud83c\uddee\ud83c[\udde8-\uddea\uddf1-\uddf4\uddf6-\uddf9]|\ud83c\uddef\ud83c[\uddea\uddf2\uddf4\uddf5]|\ud83c\uddf0\ud83c[\uddea\uddec-\uddee\uddf2\uddf3\uddf5\uddf7\uddfc\uddfe\uddff]|\ud83c\uddf1\ud83c[\udde6-\udde8\uddee\uddf0\uddf7-\uddfb\uddfe]|\ud83c\uddf2\ud83c[\udde6\udde8-\udded\uddf0-\uddff]|\ud83c\uddf3\ud83c[\udde6\udde8\uddea-\uddec\uddee\uddf1\uddf4\uddf5\uddf7\uddfa\uddff]|\ud83c\uddf4\ud83c\uddf2|\ud83c\uddf5\ud83c[\udde6\uddea-\udded\uddf0-\uddf3\uddf7-\uddf9\uddfc\uddfe]|\ud83c\uddf6\ud83c\udde6|\ud83c\uddf7\ud83c[\uddea\uddf4\uddf8\uddfa\uddfc]|\ud83c\uddf8\ud83c[\udde6-\uddea\uddec-\uddf4\uddf7-\uddf9\uddfb\uddfd-\uddff]|\ud83c\uddf9\ud83c[\udde6\udde8\udde9\uddeb-\udded\uddef-\uddf4\uddf7\uddf9\uddfb\uddfc\uddff]|\ud83c\uddfa\ud83c[\udde6\uddec\uddf2\uddf3\uddf8\uddfe\uddff]|\ud83c\uddfb\ud83c[\udde6\udde8\uddea\uddec\uddee\uddf3\uddfa]|\ud83c\uddfc\ud83c[\uddeb\uddf8]|\ud83c\uddfd\ud83c\uddf0|\ud83c\uddfe\ud83c[\uddea\uddf9]|\ud83c\uddff\ud83c[\udde6\uddf2\uddfc]|\ud83c[\udccf\udd8e\udd91-\udd9a\udde6-\uddff\ude01\ude32-\ude36\ude38-\ude3a\ude50\ude51\udf00-\udf20\udf2d-\udf35\udf37-\udf7c\udf7e-\udf84\udf86-\udf93\udfa0-\udfc1\udfc5\udfc6\udfc8\udfc9\udfcf-\udfd3\udfe0-\udff0\udff4\udff8-\udfff]|\ud83d[\udc00-\udc3e\udc40\udc44\udc45\udc51-\udc65\udc6a-\udc6d\udc6f\udc79-\udc7b\udc7d-\udc80\udc84\udc88-\udca9\udcab-\udcfc\udcff-\udd3d\udd4b-\udd4e\udd50-\udd67\udda4\uddfb-\ude44\ude48-\ude4a\ude80-\udea2\udea4-\udeb3\udeb7-\udebf\udec1-\udec5\uded0-\uded2\udeeb\udeec\udef4-\udef9]|\ud83e[\udd10-\udd17\udd1d\udd20-\udd25\udd27-\udd2f\udd3a\udd3c\udd40-\udd45\udd47-\udd70\udd73-\udd76\udd7a\udd7c-\udda2\uddb4\uddb7\uddc0-\uddc2\uddd0\uddde-\uddff]|[\u23e9-\u23ec\u23f0\u23f3\u267e\u26ce\u2705\u2728\u274c\u274e\u2753-\u2755\u2795-\u2797\u27b0\u27bf\ue50a])|\ufe0f)/;
diff --git a/src/mfm/parse/elements/emoji.ts b/src/mfm/parse/elements/emoji.ts
deleted file mode 100644
index 6c09ddf5c0..0000000000
--- a/src/mfm/parse/elements/emoji.ts
+++ /dev/null
@@ -1,33 +0,0 @@
-/**
- * Emoji
- */
-
-import { emojiRegex } from "./emoji.regex";
-
-export type TextElementEmoji = {
-	type: 'emoji';
-	content: string;
-	emoji?: string;
-	name?: string;
-};
-
-export default function(text: string) {
-	const name = text.match(/^:([a-zA-Z0-9+_-]+):/);
-	if (name) {
-		return {
-			type: 'emoji',
-			content: name[0],
-			name: name[1]
-		} as TextElementEmoji;
-	}
-	const unicode = text.match(emojiRegex);
-	if (unicode) {
-		const [content] = unicode;
-		return {
-			type: 'emoji',
-			content,
-			emoji: content
-		} as TextElementEmoji;
-	}
-	return null;
-}
diff --git a/src/mfm/parse/elements/hashtag.ts b/src/mfm/parse/elements/hashtag.ts
deleted file mode 100644
index df07de6645..0000000000
--- a/src/mfm/parse/elements/hashtag.ts
+++ /dev/null
@@ -1,27 +0,0 @@
-/**
- * Hashtag
- */
-
-export type TextElementHashtag = {
-	type: 'hashtag';
-	content: string;
-	hashtag: string;
-};
-
-export default function(text: string, before: string) {
-	const isBegin = before == '';
-
-	if (!(/^\s#[^\s\.,!\?#]+/.test(text) || (isBegin && /^#[^\s\.,!\?#]+/.test(text)))) return null;
-	const isHead = text.startsWith('#');
-	const hashtag = text.match(/^\s?#[^\s\.,!\?#]+/)[0];
-	const res: any[] = !isHead ? [{
-		type: 'text',
-		content: text[0]
-	}] : [];
-	res.push({
-		type: 'hashtag',
-		content: isHead ? hashtag : hashtag.substr(1),
-		hashtag: isHead ? hashtag.substr(1) : hashtag.substr(2)
-	});
-	return res as TextElementHashtag[];
-}
diff --git a/src/mfm/parse/elements/inline-code.ts b/src/mfm/parse/elements/inline-code.ts
deleted file mode 100644
index efacd734cb..0000000000
--- a/src/mfm/parse/elements/inline-code.ts
+++ /dev/null
@@ -1,25 +0,0 @@
-/**
- * Code (inline)
- */
-
-import genHtml from '../core/syntax-highlighter';
-
-export type TextElementInlineCode = {
-	type: 'inline-code';
-	content: string;
-	code: string;
-	html: string;
-};
-
-export default function(text: string) {
-	const match = text.match(/^`(.+?)`/);
-	if (!match) return null;
-	if (match[1].includes('´')) return null;
-	const code = match[0];
-	return {
-		type: 'inline-code',
-		content: code,
-		code: match[1],
-		html: genHtml(match[1])
-	} as TextElementInlineCode;
-}
diff --git a/src/mfm/parse/elements/link.ts b/src/mfm/parse/elements/link.ts
deleted file mode 100644
index 972fce3810..0000000000
--- a/src/mfm/parse/elements/link.ts
+++ /dev/null
@@ -1,27 +0,0 @@
-/**
- * Link
- */
-
-export type TextElementLink = {
-	type: 'link';
-	content: string;
-	title: string;
-	url: string;
-	silent: boolean;
-};
-
-export default function(text: string) {
-	const match = text.match(/^\??\[([^\[\]]+?)\]\((https?:\/\/[\w\/:%#@\$&\?!\(\)\[\]~\.=\+\-]+?)\)/);
-	if (!match) return null;
-	const silent = text.startsWith('?');
-	const link = match[0];
-	const title = match[1];
-	const url = match[2];
-	return {
-		type: 'link',
-		content: link,
-		title: title,
-		url: url,
-		silent: silent
-	} as TextElementLink;
-}
diff --git a/src/mfm/parse/elements/math.ts b/src/mfm/parse/elements/math.ts
deleted file mode 100644
index f2b6c5f479..0000000000
--- a/src/mfm/parse/elements/math.ts
+++ /dev/null
@@ -1,20 +0,0 @@
-/**
- * Math
- */
-
-export type TextElementMath = {
-	type: 'math';
-	content: string;
-	formula: string;
-};
-
-export default function(text: string) {
-	const match = text.match(/^\\\((.+?)\\\)/);
-	if (!match) return null;
-	const math = match[0];
-	return {
-		type: 'math',
-		content: math,
-		formula: match[1]
-	} as TextElementMath;
-}
diff --git a/src/mfm/parse/elements/mention.ts b/src/mfm/parse/elements/mention.ts
deleted file mode 100644
index 7a609e5d34..0000000000
--- a/src/mfm/parse/elements/mention.ts
+++ /dev/null
@@ -1,29 +0,0 @@
-/**
- * Mention
- */
-import parseAcct from '../../../misc/acct/parse';
-import { toUnicode } from 'punycode';
-
-export type TextElementMention = {
-	type: 'mention';
-	content: string;
-	canonical: string;
-	username: string;
-	host: string;
-};
-
-export default function(text: string, before: string) {
-	const match = text.match(/^@[a-z0-9_]+(?:@[a-z0-9\.\-]+[a-z0-9])?/i);
-	if (!match) return null;
-	if (/[a-zA-Z0-9]$/.test(before)) return null;
-	const mention = match[0];
-	const { username, host } = parseAcct(mention.substr(1));
-	const canonical = host != null ? `@${username}@${toUnicode(host)}` : mention;
-	return {
-		type: 'mention',
-		content: mention,
-		canonical,
-		username,
-		host
-	} as TextElementMention;
-}
diff --git a/src/mfm/parse/elements/motion.ts b/src/mfm/parse/elements/motion.ts
deleted file mode 100644
index c6500e7be0..0000000000
--- a/src/mfm/parse/elements/motion.ts
+++ /dev/null
@@ -1,20 +0,0 @@
-/**
- * Motion
- */
-
-export type TextElementMotion = {
-	type: 'motion';
-	content: string;
-	motion: string;
-};
-
-export default function(text: string) {
-	const match = text.match(/^\(\(\((.+?)\)\)\)/) || text.match(/^<motion>(.+?)<\/motion>/);
-	if (!match) return null;
-	const motion = match[0];
-	return {
-		type: 'motion',
-		content: motion,
-		motion: match[1]
-	} as TextElementMotion;
-}
diff --git a/src/mfm/parse/elements/quote.ts b/src/mfm/parse/elements/quote.ts
deleted file mode 100644
index 969c1fb4a9..0000000000
--- a/src/mfm/parse/elements/quote.ts
+++ /dev/null
@@ -1,30 +0,0 @@
-/**
- * Quoted text
- */
-
-export type TextElementQuote = {
-	type: 'quote';
-	content: string;
-	quote: string;
-};
-
-export default function(text: string, before: string) {
-	const isBegin = before == '';
-
-	const match = text.match(/^"([\s\S]+?)\n"/) || text.match(/^\n>([\s\S]+?)(\n\n|$)/) ||
-		(isBegin ? text.match(/^>([\s\S]+?)(\n\n|$)/) : null);
-
-	if (!match) return null;
-
-	const quote = match[1]
-		.split('\n')
-		.map(line => line.replace(/^>+/g, '').trim())
-		.join('\n')
-		.trim();
-
-	return {
-		type: 'quote',
-		content: match[0],
-		quote: quote,
-	} as TextElementQuote;
-}
diff --git a/src/mfm/parse/elements/search.ts b/src/mfm/parse/elements/search.ts
deleted file mode 100644
index f51844b079..0000000000
--- a/src/mfm/parse/elements/search.ts
+++ /dev/null
@@ -1,19 +0,0 @@
-/**
- * Search
- */
-
-export type TextElementSearch = {
-	type: 'search';
-	content: string;
-	query: string;
-};
-
-export default function(text: string) {
-	const match = text.match(/^(.+?)( |　)(検索|\[検索\]|Search|\[Search\])(\n|$)/i);
-	if (!match) return null;
-	return {
-		type: 'search',
-		content: match[0],
-		query: match[1]
-	};
-}
diff --git a/src/mfm/parse/elements/title.ts b/src/mfm/parse/elements/title.ts
deleted file mode 100644
index a9922c8aca..0000000000
--- a/src/mfm/parse/elements/title.ts
+++ /dev/null
@@ -1,21 +0,0 @@
-/**
- * Title
- */
-
-export type TextElementTitle = {
-	type: 'title';
-	content: string;
-	title: string;
-};
-
-export default function(text: string, before: string) {
-	const isBegin = before == '';
-
-	const match = isBegin ? text.match(/^(【|\[)(.+?)(】|])\n/) : text.match(/^\n(【|\[)(.+?)(】|])\n/);
-	if (!match) return null;
-	return {
-		type: 'title',
-		content: match[0],
-		title: match[2]
-	} as TextElementTitle;
-}
diff --git a/src/mfm/parse/elements/url.ts b/src/mfm/parse/elements/url.ts
deleted file mode 100644
index a16f67f2c2..0000000000
--- a/src/mfm/parse/elements/url.ts
+++ /dev/null
@@ -1,23 +0,0 @@
-/**
- * URL
- */
-
-export type TextElementUrl = {
-	type: 'url';
-	content: string;
-	url: string;
-};
-
-export default function(text: string, before: string) {
-	const match = text.match(/^https?:\/\/[\w\/:%#@\$&\?!\(\)\[\]~\.,=\+\-]+/);
-	if (!match) return null;
-	let url = match[0];
-	if (url.endsWith('.')) url = url.substr(0, url.lastIndexOf('.'));
-	if (url.endsWith(',')) url = url.substr(0, url.lastIndexOf(','));
-	if (url.endsWith(')') && before.endsWith('(')) url = url.substr(0, url.lastIndexOf(')'));
-	return {
-		type: 'url',
-		content: url,
-		url: url
-	} as TextElementUrl;
-}