hicli/html,web/timeline: add support for LaTeX rendering

go.mod

@@ -16,7 +16,7 @@ require (
 	github.com/tidwall/gjson v1.18.0
 	github.com/tidwall/sjson v1.2.5
 	github.com/yuin/goldmark v1.7.7
-	go.mau.fi/util v0.8.2-0.20241027163518-38d54fc87ee3
+	go.mau.fi/util v0.8.2-0.20241030110711-b3e597e16b74
 	go.mau.fi/zeroconfig v0.1.3
 	golang.org/x/crypto v0.28.0
 	golang.org/x/image v0.21.0
@@ -24,7 +24,7 @@ require (
 	golang.org/x/text v0.19.0
 	gopkg.in/yaml.v3 v3.0.1
 	maunium.net/go/mauflag v1.0.0
-	maunium.net/go/mautrix v0.21.2-0.20241026115159-a59d4d78677f
+	maunium.net/go/mautrix v0.21.2-0.20241101162620-f606129e732f
 	mvdan.cc/xurls/v2 v2.5.0
 )
 

go.sum

@@ -61,8 +61,8 @@ github.com/tidwall/sjson v1.2.5 h1:kLy8mja+1c9jlljvWTlSazM7cKDRfJuR/bOJhcY5NcY=
 github.com/tidwall/sjson v1.2.5/go.mod h1:Fvgq9kS/6ociJEDnK0Fk1cpYF4FIW6ZF7LAe+6jwd28=
 github.com/yuin/goldmark v1.7.7 h1:5m9rrB1sW3JUMToKFQfb+FGt1U7r57IHu5GrYrG2nqU=
 github.com/yuin/goldmark v1.7.7/go.mod h1:uzxRWxtg69N339t3louHJ7+O03ezfj6PlliRlaOzY1E=
-go.mau.fi/util v0.8.2-0.20241027163518-38d54fc87ee3 h1:9dDTNcVc3y9oU9bYvjpc3xsCupwGzfyYhrppaLy6l9k=
+go.mau.fi/util v0.8.2-0.20241030110711-b3e597e16b74 h1:hzVVXFEIQWefBlokVlQ2nr7EzRnMdMLF+K+kqWsm6OE=
-go.mau.fi/util v0.8.2-0.20241027163518-38d54fc87ee3/go.mod h1:T1u/rD2rzidVrBLyaUdPpZiJdP/rsyi+aTzn0D+Q6wc=
+go.mau.fi/util v0.8.2-0.20241030110711-b3e597e16b74/go.mod h1:T1u/rD2rzidVrBLyaUdPpZiJdP/rsyi+aTzn0D+Q6wc=
 go.mau.fi/zeroconfig v0.1.3 h1:As9wYDKmktjmNZW5i1vn8zvJlmGKHeVxHVIBMXsm4kM=
 go.mau.fi/zeroconfig v0.1.3/go.mod h1:NcSJkf180JT+1IId76PcMuLTNa1CzsFFZ0nBygIQM70=
 golang.org/x/crypto v0.28.0 h1:GBDwsMXVQi34v5CCYUm2jkJvu4cbtru2U4TN2PSyQnw=
@@ -89,7 +89,7 @@ gopkg.in/yaml.v3 v3.0.1 h1:fxVm/GzAzEWqLHuvctI91KS9hhNmmWOoWu0XTYJS7CA=
 gopkg.in/yaml.v3 v3.0.1/go.mod h1:K4uyk7z7BCEPqu6E+C64Yfv1cQ7kz7rIZviUmN+EgEM=
 maunium.net/go/mauflag v1.0.0 h1:YiaRc0tEI3toYtJMRIfjP+jklH45uDHtT80nUamyD4M=
 maunium.net/go/mauflag v1.0.0/go.mod h1:nLivPOpTpHnpzEh8jEdSL9UqO9+/KBJFmNRlwKfkPeA=
-maunium.net/go/mautrix v0.21.2-0.20241026115159-a59d4d78677f h1:fZL9ASp9m4KaC0QUEDkv5ptPwVvRjigy9uPI6NYZAD0=
+maunium.net/go/mautrix v0.21.2-0.20241101162620-f606129e732f h1:4iO+tXpXS8BNZuJP17BpaPZAURknrufVgkVrFkTHv7Y=
-maunium.net/go/mautrix v0.21.2-0.20241026115159-a59d4d78677f/go.mod h1:sjCZR1R/3NET/WjkcXPL6WpAHlWKku9HjRsdOkbM8Qw=
+maunium.net/go/mautrix v0.21.2-0.20241101162620-f606129e732f/go.mod h1:sjCZR1R/3NET/WjkcXPL6WpAHlWKku9HjRsdOkbM8Qw=
 mvdan.cc/xurls/v2 v2.5.0 h1:lyBNOm8Wo71UknhUs4QTFUNNMyxy2JEIaKKo0RWOh+8=
 mvdan.cc/xurls/v2 v2.5.0/go.mod h1:yQgaGQ1rFtJUzkmKiHYSSfuQxqfYmd//X6PxvholpeE=

pkg/hicli/database/event.go

@@ -292,6 +292,7 @@ type LocalContent struct {
 	HTMLVersion   int    `json:"html_version,omitempty"`
 	WasPlaintext  bool   `json:"was_plaintext,omitempty"`
 	BigEmoji      bool   `json:"big_emoji,omitempty"`
+	HasMath       bool   `json:"has_math,omitempty"`
 }
 
 type Event struct {

pkg/hicli/html.go

@@ -79,6 +79,15 @@ func calculateMediaSize(widthInt, heightInt int) (width, height float64, ok bool
 	return
 }
 
+func getAttribute(attrs []html.Attribute, key string) (string, bool) {
+	for _, attr := range attrs {
+		if attr.Key == key {
+			return attr.Val, true
+		}
+	}
+	return "", false
+}
+
 func parseImgAttributes(attrs []html.Attribute) (src, alt, title string, isCustomEmoji bool, width, height int) {
 	for _, attr := range attrs {
 		switch attr.Key {
@@ -99,7 +108,7 @@ func parseImgAttributes(attrs []html.Attribute) (src, alt, title string, isCusto
 	return
 }
 
-func parseSpanAttributes(attrs []html.Attribute) (bgColor, textColor, spoiler, maths string, isSpoiler bool) {
+func parseSpanAttributes(attrs []html.Attribute) (bgColor, textColor, spoiler string, isSpoiler bool) {
 	for _, attr := range attrs {
 		switch attr.Key {
 		case "data-mx-bg-color":
@@ -113,8 +122,6 @@ func parseSpanAttributes(attrs []html.Attribute) (bgColor, textColor, spoiler, m
 		case "data-mx-spoiler":
 			spoiler = attr.Val
 			isSpoiler = true
-		case "data-mx-maths":
-			maths = attr.Val
 		}
 	}
 	return
@@ -430,7 +437,7 @@ func writeImg(w *strings.Builder, attr []html.Attribute) id.ContentURI {
 }
 
 func writeSpan(w *strings.Builder, attr []html.Attribute) {
-	bgColor, textColor, spoiler, _, isSpoiler := parseSpanAttributes(attr)
+	bgColor, textColor, spoiler, isSpoiler := parseSpanAttributes(attr)
 	if isSpoiler && spoiler != "" {
 		w.WriteString(`<span class="spoiler-reason">`)
 		w.WriteString(spoiler)
@@ -521,10 +528,6 @@ Loop:
 			if !tagIsAllowed(token.DataAtom) {
 				continue
 			}
-			tagIsSelfClosing := isSelfClosing(token.DataAtom)
-			if token.Type == html.SelfClosingTagToken && !tagIsSelfClosing {
-				continue
-			}
 			switch token.DataAtom {
 			case atom.Pre:
 				codeBlock = &strings.Builder{}
@@ -539,8 +542,22 @@ Loop:
 				if !mxc.IsEmpty() {
 					inlineImages = append(inlineImages, mxc)
 				}
+			case atom.Div:
+				math, ok := getAttribute(token.Attr, "data-mx-maths")
+				if ok {
+					built.WriteString(`<hicli-math displaymode="block"`)
+					writeAttribute(&built, "latex", math)
+					token.DataAtom = atom.Math
+				}
 			case atom.Span, atom.Font:
+				math, ok := getAttribute(token.Attr, "data-mx-maths")
+				if ok && token.DataAtom == atom.Span {
+					built.WriteString(`<hicli-math displaymode="inline"`)
+					writeAttribute(&built, "latex", math)
+					token.DataAtom = atom.Math
+				} else {
 					writeSpan(&built, token.Attr)
+				}
 			default:
 				built.WriteByte('<')
 				built.WriteString(token.Data)
@@ -550,18 +567,24 @@ Loop:
 					}
 				}
 			}
+			if token.Type == html.SelfClosingTagToken {
+				built.WriteByte('/')
+			}
 			built.WriteByte('>')
-			if !tagIsSelfClosing {
+			if !isSelfClosing(token.DataAtom) && token.Type != html.SelfClosingTagToken {
 				ts.push(token.DataAtom)
 			}
 		case html.EndTagToken:
 			tagName, _ := tz.TagName()
 			tag := atom.Lookup(tagName)
+			if !tagIsAllowed(tag) {
+				continue
+			}
 			if tag == atom.Pre && codeBlock != nil {
 				writeCodeBlock(&built, codeBlockLanguage, codeBlock)
 				codeBlockLanguage = ""
 				codeBlock = nil
-			} else if tagIsAllowed(tag) && ts.pop(tag) {
+			} else if ts.pop(tag) {
 				// TODO instead of only popping when the last tag in the stack matches, this should go through the stack
 				//      and close all tags until it finds the matching tag
 				if tag == atom.Font {
@@ -571,6 +594,8 @@ Loop:
 					built.Write(tagName)
 					built.WriteByte('>')
 				}
+			} else if (tag == atom.Span || tag == atom.Div) && ts.pop(atom.Math) {
+				built.WriteString("</hicli-math>")
 			}
 		case html.TextToken:
 			if codeBlock != nil {

pkg/hicli/sync.go

@@ -367,7 +367,7 @@ func (h *HiClient) calculateLocalContent(ctx context.Context, dbEvt *database.Ev
 	}
 	if content != nil {
 		var sanitizedHTML string
-		var wasPlaintext, bigEmoji bool
+		var wasPlaintext, hasMath, bigEmoji bool
 		var inlineImages []id.ContentURI
 		if content.Format == event.FormatHTML && content.FormattedBody != "" {
 			var err error
@@ -377,6 +377,7 @@ func (h *HiClient) calculateLocalContent(ctx context.Context, dbEvt *database.Ev
 					Stringer("event_id", dbEvt.ID).
 					Msg("Failed to sanitize HTML")
 			}
+			hasMath = strings.Contains(sanitizedHTML, "<hicli-math")
 			if len(inlineImages) > 0 && dbEvt.RowID != 0 {
 				for _, uri := range inlineImages {
 					h.addMediaCache(ctx, dbEvt.RowID, uri.CUString(), nil, nil, "")
@@ -406,12 +407,13 @@ func (h *HiClient) calculateLocalContent(ctx context.Context, dbEvt *database.Ev
 			HTMLVersion:   CurrentHTMLSanitizerVersion,
 			WasPlaintext:  wasPlaintext,
 			BigEmoji:      bigEmoji,
+			HasMath:       hasMath,
 		}, inlineImages
 	}
 	return nil, nil
 }
 
-const CurrentHTMLSanitizerVersion = 4
+const CurrentHTMLSanitizerVersion = 6
 
 func (h *HiClient) ReprocessExistingEvent(ctx context.Context, evt *database.Event) {
 	if (evt.Type != event.EventMessage.Type && evt.DecryptedType != event.EventMessage.Type) ||

web/package-lock.json

@@ -11,6 +11,7 @@
 			"dependencies": {
 				"@types/react": "npm:types-react@rc",
 				"@types/react-dom": "npm:types-react-dom@rc",
+				"katex": "^0.16.11",
 				"react": "^19.0.0-rc-0751fac7-20241002",
 				"react-dom": "^19.0.0-rc-0751fac7-20241002",
 				"react-spinners": "^0.14.1",
@@ -18,6 +19,7 @@
 			},
 			"devDependencies": {
 				"@eslint/js": "^9.11.1",
+				"@types/katex": "^0.16.7",
 				"@types/sanitize-html": "^2.13.0",
 				"@vitejs/plugin-react-swc": "^3.5.0",
 				"eslint": "^9.11.1",
@@ -1678,6 +1680,13 @@
 			"integrity": "sha512-dRLjCWHYg4oaA77cxO64oO+7JwCwnIzkZPdrrC71jQmQtlhM556pwKo5bUzqvZndkVbeFLIIi+9TC40JNF5hNQ==",
 			"dev": true
 		},
+		"node_modules/@types/katex": {
+			"version": "0.16.7",
+			"resolved": "https://registry.npmjs.org/@types/katex/-/katex-0.16.7.tgz",
+			"integrity": "sha512-HMwFiRujE5PjrgwHQ25+bsLJgowjGjm5Z8FVSf0N6PwgJrwxH0QxzHYDcKsTfV3wva0vzrpqMTJS2jXPr5BMEQ==",
+			"dev": true,
+			"license": "MIT"
+		},
 		"node_modules/@types/react": {
 			"name": "types-react",
 			"version": "19.0.0-rc.1",
@@ -2285,6 +2294,15 @@
 			"integrity": "sha512-dOy+3AuW3a2wNbZHIuMZpTcgjGuLU/uBL/ubcZF9OXbDo8ff4O8yVp5Bf0efS8uEoYo5q4Fx7dY9OgQGXgAsQA==",
 			"dev": true
 		},
+		"node_modules/commander": {
+			"version": "8.3.0",
+			"resolved": "https://registry.npmjs.org/commander/-/commander-8.3.0.tgz",
+			"integrity": "sha512-OkTL9umf+He2DZkUq8f8J9of7yL6RJKI24dVITBmNfZBmri9zYZQrKkuXiKhyfPSu8tUhnVBB1iKXevvnlR4Ww==",
+			"license": "MIT",
+			"engines": {
+				"node": ">= 12"
+			}
+		},
 		"node_modules/concat-map": {
 			"version": "0.0.1",
 			"resolved": "https://registry.npmjs.org/concat-map/-/concat-map-0.0.1.tgz",
@@ -3782,6 +3800,22 @@
 				"json5": "lib/cli.js"
 			}
 		},
+		"node_modules/katex": {
+			"version": "0.16.11",
+			"resolved": "https://registry.npmjs.org/katex/-/katex-0.16.11.tgz",
+			"integrity": "sha512-RQrI8rlHY92OLf3rho/Ts8i/XvjgguEjOkO1BEXcU3N8BqPpSzBNwV/G0Ukr+P/l3ivvJUE/Fa/CwbS6HesGNQ==",
+			"funding": [
+				"https://opencollective.com/katex",
+				"https://github.com/sponsors/katex"
+			],
+			"license": "MIT",
+			"dependencies": {
+				"commander": "^8.3.0"
+			},
+			"bin": {
+				"katex": "cli.js"
+			}
+		},
 		"node_modules/keyv": {
 			"version": "4.5.4",
 			"resolved": "https://registry.npmjs.org/keyv/-/keyv-4.5.4.tgz",

web/package.json

@@ -13,6 +13,7 @@
 	"dependencies": {
 		"@types/react": "npm:types-react@rc",
 		"@types/react-dom": "npm:types-react-dom@rc",
+		"katex": "^0.16.11",
 		"react": "^19.0.0-rc-0751fac7-20241002",
 		"react-dom": "^19.0.0-rc-0751fac7-20241002",
 		"react-spinners": "^0.14.1",
@@ -20,6 +21,7 @@
 	},
 	"devDependencies": {
 		"@eslint/js": "^9.11.1",
+		"@types/katex": "^0.16.7",
 		"@types/sanitize-html": "^2.13.0",
 		"@vitejs/plugin-react-swc": "^3.5.0",
 		"eslint": "^9.11.1",

web/src/api/types/hitypes.ts

@@ -84,6 +84,7 @@ export interface LocalContent {
 	html_version?: number
 	was_plaintext?: boolean
 	big_emoji?: boolean
+	has_math?: boolean
 }
 
 export interface BaseDBEvent {

web/src/ui/timeline/content/TextMessageBody.tsx

@@ -32,6 +32,19 @@ const onClickHTML = (evt: React.MouseEvent<HTMLDivElement>) => {
 	}
 }
 
+let mathImported = false
+
+function importMath() {
+	if (mathImported) {
+		return
+	}
+	mathImported = true
+	import("./math.ts").then(
+		() => console.info("Imported math"),
+		err => console.error("Failed to import math", err),
+	)
+}
+
 const TextMessageBody = ({ event, sender }: EventContentProps) => {
 	const content = event.content as MessageEventContent
 	const classNames = ["message-text"]
@@ -48,6 +61,10 @@ const TextMessageBody = ({ event, sender }: EventContentProps) => {
 	if (event.local_content?.was_plaintext) {
 		classNames.push("plaintext-body")
 	}
+	if (event.local_content?.has_math) {
+		classNames.push("math-body")
+		importMath()
+	}
 	if (event.local_content?.sanitized_html) {
 		classNames.push("html-body")
 		return <div

web/src/ui/timeline/content/math.ts

@@ -0,0 +1,65 @@
+// gomuks - A Matrix client written in Go.
+// Copyright (C) 2024 Tulir Asokan
+//
+// This program is free software: you can redistribute it and/or modify
+// it under the terms of the GNU Affero General Public License as published by
+// the Free Software Foundation, either version 3 of the License, or
+// (at your option) any later version.
+//
+// This program is distributed in the hope that it will be useful,
+// but WITHOUT ANY WARRANTY; without even the implied warranty of
+// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+// GNU Affero General Public License for more details.
+//
+// You should have received a copy of the GNU Affero General Public License
+// along with this program.  If not, see <https://www.gnu.org/licenses/>.
+import katex from "katex"
+import katexCSS from "katex/dist/katex.min.css?inline"
+
+const sheet = new CSSStyleSheet()
+sheet.replaceSync(katexCSS)
+
+class HicliMath extends HTMLElement {
+	static observedAttributes = ["displaymode", "latex"]
+	#root?: HTMLElement
+	#latex?: string
+	#displayMode?: boolean
+
+	constructor() {
+		super()
+	}
+
+	connectedCallback() {
+		const root = this.attachShadow({ mode: "open" })
+		root.adoptedStyleSheets = [sheet]
+		// This seems to work fine
+		this.#root = root as unknown as HTMLElement
+		this.#render()
+	}
+
+	attributeChangedCallback(name: string, _oldValue: string, newValue: string) {
+		if (name === "latex") {
+			this.#latex = newValue
+		} else if (name === "displaymode") {
+			this.#displayMode = newValue === "block"
+		}
+		this.#render()
+	}
+
+	#render() {
+		if (!this.#root || !this.#latex) {
+			return
+		}
+		try {
+			katex.render(this.#latex, this.#root, {
+				output: "htmlAndMathml",
+				maxSize: 10,
+				displayMode: this.#displayMode,
+			})
+		} catch (err) {
+			console.error("Failed to render math", this.#latex, err)
+		}
+	}
+}
+
+customElements.define("hicli-math", HicliMath)